imtoken钱包下载安卓2.0|machine

作者： imtoken钱包下载安卓2.0

2024-03-08 20:17:33

machine是什么意思_machine的翻译_音标_读音_用法_例句_爱词霸在线词典

ine是什么意思_machine的翻译_音标_读音_用法_例句_爱词霸在线词典首页翻译背单词写作校对词霸下载用户反馈专栏平台登录machine是什么意思_machine用英语怎么说_machine的翻译_machine翻译成_machine的中文意思_machine怎么读,machine的读音,machine的用法,machine的例句翻译人工翻译试试人工翻译翻译全文简明柯林斯牛津machine高中/CET4/CET6英 [məˈʃiːn]美 [məˈʃiːn]释义n.机器，机械; 机械般的人; 核心vt.用机器制造，用机器加工vi.被机器切削点击人工翻译，了解更多人工释义词态变化复数: machines;第三人称单数: machines;过去式: machined;过去分词: machined;现在分词: machining;实用场景例句全部机器机械核心用机器制造用机器加工Machines have replaced human labour in many industries.在许多行业中，机器已经替代了人力。牛津词典to operate/run a machine操作 / 开机器牛津词典How does this machine work?这部机器是如何工作的？牛津词典a washing/sewing machine洗衣 / 缝纫机牛津词典a machine for making plastic toys生产塑料玩具的机器牛津词典I left a message on her answering machine.我在她的电话答录机上留了言。牛津词典The potatoes are planted by machine .这些土豆是用机器种植的。牛津词典Just put those clothes in the machine (= the washing machine) .把那些衣服放到洗衣机里就行了。牛津词典The new machines (= computers) will be shipped next month.新机器下个月推向市场。牛津词典the president's propaganda machine总统的宣传班子牛津词典This material can be cut and machined easily.这种材料很容易用机器切割并加工成型。牛津词典I put the coin in the machine and pulled the lever...我把硬币投入机器，拉动控制杆。柯林斯高阶英语词典The machine can be remotely operated and monitored.这台机器可以远程操作和监控。柯林斯高阶英语词典The material is machined in a factory...这种材料在一家工厂里用机器加工成型。柯林斯高阶英语词典All parts are machined from top grade, high tensile aluminium.所有零件都是用顶级高强度铝加工而成。柯林斯高阶英语词典...Nazi Germany's military machine...纳粹德国的军事机构柯林斯高阶英语词典He has put the party publicity machine behind another candidate.他为另一位参选者在幕后组织政党宣传。柯林斯高阶英语词典I think I have got to stop or I might turn into a machine...我想我得停下来了，否则我就会变成一台机器。柯林斯高阶英语词典He has dedicated himself to his work and become just a writing machine.他忘我地投入工作，就像是一台写作机器。柯林斯高阶英语词典They advised the peasants on how to use the machine.他们指导农民如何使用这台机器.《简明英汉词典》This old machine is shot.这台机器已旧了.《简明英汉词典》This washing machine was guaranteed from mechanical failure — I demand a new one!这台洗衣机出售时曾担保过不出机械性故障——我要换一台新的.《简明英汉词典》收起实用场景例句真题例句全部四级六级高考考研Machines do most of the planting and picking, and carrots are easy to store and ship.出自-2017年6月听力原文It will be possible to create more sophisticated moral machines, if only we can find a way to set out human values as clear rules.出自-2016年6月阅读原文Informing students about the brain as a learning machine is a good strategy to enhance their motivation for learning.出自-2016年12月阅读原文In addition, parents and teachers can help children by providing explicit instruction regarding the mind as a learning machine.出自-2016年12月阅读原文Bedrooms and cars are the most obvious examples, but you can also rent camping spaces in Sweden, fields in Australia and washing machines in France出自-2013年12月阅读原文The video machine has to be checked.出自-2013年12月听力原文It turns out that the guy operates the printing machine with amazing speed, and soon he's turning out newspapers with shocking headlines.出自-2013年6月听力原文In fact, 80% of Spain's machine tools are from the Basque Country.出自-2012年6月听力原文Teaching ethics to a machine even more intelligent than we are will be the bigger challenge.2018年12月四级真题（第一套）阅读 Section CThey are already on California roads, so it is not too soon to ask whether we can program a machine to act ethically.2018年12月四级真题（第一套）阅读 Section CNo average person wants to figure out whether their favorite calendar software works with their fridge or whether their washing machine and tablet get along.出自-2016年12月阅读原文A bathing machine was rolled down to the sea shore, so women would not be seen in swimwear.2018年12月六级真题（第一套）听力 Section BA machine can read millions of essay within minutes.2018年12月六级真题（第二套）听力 Section CAs the databases grew, machine accuracy dipped across the board.2018年6月六级真题（第一套）阅读 Section CFor decades, researchers and law enforcement agencies have tried to build a machine that will do the same thing.2018年12月六级真题（第一套）听力 Section CNicholas Carr, author of The Shallows: What the Internet Is Doing to Our Brains, wrote, "The net is designed to be an interruption system, a machine geared to dividing attention."2017年12月六级真题（第一套）阅读 Section BIf I'm right, we should foster a creative spirit because a dose of illogical creativity will complement the rationality of the machine.2019年6月六级真题（第三套）阅读 Section CIn studies, he gave subjects a chance to deceive for monetary gain while examining their brains in a functional Mri machine, which maps blood flow to active parts of the brain.2019年12月六级真题（第一套）阅读 Section CLet's hope they' re wise enough not to be fooled by a machine that claims to determine truthfulness at the flip of a switch.2018年12月六级真题（第一套）听力 Section CMachine learning is now capable of far, far more complex tasks.2018年12月六级真题（第二套）听力 Section CMachines also had difficulty adjusting for people who look a lot alike—either doppelgangers, whom the machine would have trouble identifying as two separate people, or the same person who appeared in different photos at different ages or in different ligh2018年6月六级真题（第一套）阅读 Section CNo average person wants to figure out whether their favorite calendar software works with their fridge or whether their washing machine and tablet get along.2016年12月六级真题（第二套）阅读 Section BSeveral companies around the world have produced prototypes that can drive on roads and fly, airbus has a futuristic modular concept involving a passenger capsule that can be detached from the road- going chassis and picked up by a helicopter-type machine2019年6月六级真题（第二套）阅读 Section ASo we must aim to complement the rationality of the machine, rather than to compete with it.2019年6月六级真题（第三套）阅读 Section CSome have 26 vanished from the face of the earth, others are dying slowly, but all have 27 undergone changes as they have come into contact with an 28 expanding machine civilization.2016年12月六级真题（第三套）阅读 Section AThe company might be very optimistic, but the ability of their machine to detect deception has not provided credible proof.2018年12月六级真题（第一套）听力 Section CThe fundamental limitation of machine learning is that it needs to learn from large volumes of past data.2018年12月六级真题（第二套）听力 Section CA machine with a specific purpose has another quality, one that we usually associate with living things: a wish to preserve its own existence.2017年高考英语北京卷阅读理解阅读D 原文Buy it from a fare card machine in metro stations.2014年高考英语全国卷2 阅读理解阅读D 原文Even when the machines are recycled and the harmful metals removed, the recycling process often is carried out in poor countries, in practically uncontrolled ways which allow many poisonous substances to escape into the environment.2015年高考英语江苏卷阅读理解阅读B 原文Farecard machine are in every station, bring small bills because there are no change machines in the station and farecard machine only provide up to $ 5 in change.2014年高考英语全国卷2 阅读理解阅读D 原文For the machine, this quality is not in-born, nor is it something introduced by humans; it is a logical consequence of the simple fact that the machine cannot achieve its original purpose if it is dead.2017年高考英语北京卷阅读理解阅读D 原文Help super intelligent machines work better.2017年高考英语北京卷阅读理解阅读D 选项Hollywood's theory that machines with evil minds will drive armies of killer robots is just silly.2017年高考英语北京卷阅读理解阅读D 原文If we are not careful, then, we could face a kind of global chess match against very determined, super intelligent machines whose objectives conflict with our own, with the real world as the chessboard.2017年高考英语北京卷阅读理解阅读D 原文Machines with specific purposes are associated with living things partly because they might be able to prevent themselves from being destroyed.2017年高考英语北京卷阅读理解阅读D 题设My washing machine is being repaired this week, so I have to wash my clothes by hand.2018年高考英语天津卷单项填空原文Others say we can just "switch them off" as if super intelligent machines are too stupid to think of that possibility.2017年高考英语北京卷阅读理解阅读D 原文Reaching over to my collection of CDs, I blindly took one out, put it in the machine and played it.2015年高考英语湖南卷完形填空原文Recent development has made possible machines that print, cook, and serve foods on a mass scale.2018年高考英语天津卷阅读理解阅读C 原文Some argue that humans and machines can coexist as long as they work in teams—yet that is not possible unless machines share the goals of humans.2017年高考英语北京卷阅读理解阅读D 原文Some researchers argue that we can seal the machines inside a kind of firewall, using them to answer difficult questions.2017年高考英语北京卷阅读理解阅读D 原文There are probably decades in which to plan for the arrival of super intelligent machines.2017年高考英语北京卷阅读理解阅读D 原文They are connected to change machines.2014年高考英语全国卷2 阅读理解阅读D 选项This makes a fun activity for a children's party; they love feeding the fruit and frozen bananas into the top of the machine and watching the ice cream come out below.2018年高考英语全国卷2 阅读理解阅读B 原文We have yet to invent a firewall that is secure against ordinary humans, let alone super intelligent machines.2017年高考英语北京卷阅读理解阅读D 原文Such food service operators range from snack machines to large institutional catering ventures, but most of these businesses are known in the trade as “horeca”： hotels, restaurants and cafes.出自-2010年考研阅读原文The second half of the 20th century saw a collection of geniuses, warriors, entrepreneurs and visionaries labour to create a fabulous machine that could function as a typewriter and printing press, studio and theatre, paintbrush and gallery, piano and radio, the mail as well as the mail carrier.出自-2012年考研阅读原文The networked computer is an amazing device, the first media machine that serves as the mode of production, means of distribution, site of reception, and place of praise and critique.出自-2012年考研阅读原文The computer is the 21st century's culture machine.出自-2012年考研阅读原文For all the possibilities of our new culture machines, most people are still stuck in download mode.出自-2012年考研阅读原文In previous eras of drastic technological change, entrepreneurs smoothed the transition by dreaming up ways to combine labor and machines.出自-2018年考研阅读原文Destroying the machines that are coming for our jobs would be nuts.出自-2018年考研阅读原文The concept of man versus machine is at least as old as the industrial revolution, but this phenomenon tends to be most acutely felt during economic downturns and fragile recoveries.2014年考研真题（英语二）阅读理解 Section ⅡThe first step, as Erik Brynjolfsson and Andrew MeAfee argue in The Second Machine Age, should be rethinking education and job training.2018年考研真题（英语一）阅读理解 Section ⅡThe second half of the 20th century saw a collection of geniuses, warriors, entrepreneurs and visionaries labour to create a fabulous machine that could function as a typewriter and printing press, studio and theatre, paintbrush and gallery, piano and rad2012年考研真题（英语一）阅读理解 Section ⅡThe younger they learn how computers think, how to coax the machine into producing what they want 一 the earlier they learn that they have the power to do that 一 the better.2016年考研真题（英语二）阅读理解 Section ⅡThis argument has attracted a lot of attention, via the success of the book Race Against the Machine, by Erik Brynjolfsson and Andrew McAfee, who both hail from MTI's Center for Digital Business.2014年考研真题（英语二）阅读理解 Section ⅡWe are just in a situation where there are no good theories explaining what consciousnesss actually is and how you could ever build a machine to get there.2020年考研真题（英语一）翻译 Section ⅢWe need to reframe race against the machine as race with the machine.2014年考研真题（英语二）阅读理解 Section Ⅱ收起真题例句英英释义Noun1. any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks2. an intricate organization that accomplishes its goals efficiently;"the war machine"3. an efficient person;"the boxer was a magnificent fighting machine"4. 4-wheeled motor vehicle; usually propelled by an internal combustion engine;"he needs a car to get to work"5. a group that controls the activities of a political party;"he was endorsed by the Democratic machine"6. a device for overcoming resistance at one point by applying force at some other pointVerb1. turn, shape, mold, or otherwise finish by machinery2. make by machinery;"The Americans were machining while others still hand-made cars"收起英英释义词根词缀词根: mach=machine,表示"机器"n.machine 机器,机械mach机器+ine物体→n.机器,机械同义词辨析machine, machinery, mechanism, apparatus, engine, motor这些名词均有"机器，装置"之意。machine：普通用词，泛指一切机器。machinery：指机器的总称。mechanism：指运行系统，简单的机械装置。apparatus：指具有特殊用途的装置。engine：既可泛指或大或小、简单或复杂的机械、机器，又可指产生动力的发动机或引擎。motor：通常指小型或轻型马达、发动机。同义词n.机器,机械devicemechanismgeneratorgadgetcontraptionlevermotorapparatusinstrumentengineappliancen.机器人,自动化robotautomatonn.机构coteriecabalsetcouncilpartyorganizationcirclecliquen.汽车,机动车辆,飞机planeautomobilehelicoptercarautovehiclemotorcarairplane其他释义organ行业词典医学机，机器：产生、转换或传送能量或力的装置法律机器保养释义词态变化实用场景例句真题例句英英释义词根词缀同义词辨析同义词行

Python使用加载machine库-CSDN博客

Python使用加载machine库

lchrisl

已于 2023-01-20 15:45:08 修改

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ESP8266

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python

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单片机

mcu

嵌入式硬件

于 2023-01-14 10:32:48 首次发布

本文链接：https://blog.csdn.net/u010262704/article/details/128682738

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先升级pip install --upgrade pip

machine

pip install machine

基本思路如下：

1、先找到python文件夹，也就是安装python的文件夹，或者pycharm的文件夹。

2、在文件夹下面找到Scripts文件夹，一般库都是安装在这里面的，你需要找到从根目录开始的完整路径。

3、我安装的是D盘，所以第一步我是在cmd里面输入d:切换到d盘，在依次使用cd+空格+目录找到Scripts目录，待cmd上显示D:\pycharm\venv\Scripts>的字样后就可以开始安装了。

4、pip install + 库名（这个出错较少，不是国内源，下载安装会比较慢，但是问题不大）

5、pip install + 库名 + -i + https://pypi.douban.com/simple 是豆瓣的国内源，安装会比较快。

6、以下是国内常用的源，可供使用。

"阿里云： https://mirrors.aliyun.com/pypi/simple/

中国科技大学： https://pypi.mirrors.ustc.edu.cn/simple/

豆瓣(douban)： http://pypi.douban.com/simple/

清华大学： https://pypi.tuna.tsinghua.edu.cn/simple/

中国科学技术大学： http://pypi.mirrors.ustc.edu.cn/simple/"

#wificonnect v1.0 by tdccj

from machine import Pin #加载运行库

import network

import time

wifi = open('wifi.txt','r') #读取储存的账号密码

名 = wifi.readline()

名 = 名.strip('\n')

密码 = wifi.readline()

print(名)

print(密码)

wlan = network.WLAN(network.STA_IF) #设置为终端模式

wifi指示灯=Pin(2,Pin.OUT)#启动PIN2为wifi指示灯

wlan.active(True)#启用无线网路

开始时间 = time.time()

wifi指示灯.value(0)

print ("wifi连接中")

wlan.connect(名,密码) #连接wifi

wifi.close

time.sleep(0.2)

while not wlan.isconnected():

print ('等待连接')

wifi指示灯.value(1)

time.sleep(1)

wifi指示灯.value(0)

time.sleep(1)

if time.time()-开始时间>10: #如果等待超过10秒

print('超时未响应')

for num in range(2):

wifi指示灯.value(0)

time.sleep(2)

wifi指示灯.value(1)

time.sleep(1)

print('连接失败，请重新输入wifi名') #重新输入

名 = input()

print('请重新输入密码')

密码 = input()

wlan.connect(名,密码) #重新连接

开始时间 = time.time()

if wlan.isconnected():

for num in range(3):

wifi指示灯.value(0)

time.sleep(0.2)

wifi指示灯.value(1)

time.sleep(0.2)

wifi = open('wifi.txt','w') #写入

wifi.write(名)

wifi.write('\n')

wifi.write(密码)

wifi.close

wifi = open('wifi.txt','r') #校对

账号 = wifi.readline()

账号 = 账号.strip('\n')

print (账号)

密码 = wifi.readline()

print (密码)

wifi.close

print ('wifi连接成功') #反馈

print ('wifi信息：=%s'%str(wlan.ifconfig()))

8266与硬件相关的指令都在machine库中，并根据功能分成不同的类（class），例如，与脚有关的命令在machine库的Pin类中。

from machine import Pin(from库中只导入脚类）

import machine（导入这个库的所有类）

应用一：读取微动开关控制LED

from machine import Pin #导入库

import time #导入控制时间库

toggle=1

led=Pin(15,Pin.OUT)

sw=Pin(0,Pin.IN)

while True:

if sw.value()==0:

toggle=not toggle

led.value(toggle)

运行说明：微动开关接GND和GPIO0脚，LED灯接GPIO15脚；8266循环读取0脚状态，当开关导通0脚低电平；即val的值为0；接15脚的led的值也为0，关灯。

应用二：按一下亮灯，再按一下关灯

from machine import Pin #导入库

import time #导入控制时间库

toggle=1

led=Pin(15,Pin.OUT)

sw=Pin(0,Pin.IN)

while True:

if sw.value()==0:

toggle=not toggle

led.value(toggle)

本程序的缺点，按开关时，不是按一下就准确在反转，存在不稳定，主要原因是在while的作用下循环不断地进行，即不断地反转，而造成LED随机亮灭的结果。

（2）优化方案一：在按下开关时（读取开关脚的状态），程序什么也不做，这样就防止进入循环。程序见下：

from machine import Pin #导入库

import time #导入控制时间库

toggle=1

led=Pin(15,Pin.OUT)

sw=Pin(0,Pin.IN)

while True:

if sw.value()==0:

toggle=not toggle #将toggler的值进行not(反相

）

led.value(toggle)

while sw.value()==0: #while(当）开关按下时

pass # 什么也不做，暂停

（3）优化方案二：在按下开关时（读取开关脚的状态），对LED灯现状态进行反转，同时程序什么也不做，直至放开开关后再继续循环。对比优化方案一程序少了两行命令。程序见下：

from machine import Pin #导入库

import time #导入控制时间库

led=Pin(15,Pin.OUT)

sw=Pin(0,Pin.IN)

while True:

if sw.value()==0: #如果按下开关

led.value(not led.value()) #对LED状态进行反转

while sw.value()==0: #while(当）开关按下时

pass # 什么也不做，暂停

（4）优化进阶：消除开关切换时振动造成的开关铜片弹跳现象。方法是进行2－30毫秒的延时。

from machine import Pin #导入库

import time #导入控制时间库

led=Pin(15,Pin.OUT)

sw=Pin(0,Pin.IN)

while True:

if sw.value()==0: #如果按下开关

time.sleep(0.1) #延时0.1秒，或写成time.sleep_ms(100)

led.value(not led.value()) #对LED状态进行反转

while sw.value()==0: #while(当）开关按下时

pass # 什么也不做，暂停

（5）增加一个LED2灯与LED灯成反相

from machine import Pin #导入库

import time #导入控制时间库

led2=Pin(9,Pin.OUT)

led=Pin(15,Pin.OUT)

sw=Pin(0,Pin.IN)

while True:

if sw.value()==0: #如果按下开关

time.sleep(0.1) #延时0.1秒

led.value(not led.value()) #对LED状态进行反转

led2.value(not led.value())

while sw.value()==0: #while(当）开关按下时

pass # 什么也不做，暂停

（六）增加一个副程序（MINI）。主程序main.py ；副程序 MINI.py

主程序

#main.py

from machine import Pin #导入库

import time #导入控制时间库

import MINI #导入副程序MINI

led2=Pin(9,Pin.OUT)

led=Pin(15,Pin.OUT)

sw=Pin(0,Pin.IN)

while True:

if sw.value()==0: #如果按下开关

MINI.hello() #运行MINI中的自定义函数hello

time.sleep(0.1) #延时0.1秒

led.value(not led.value()) #对LED状态进行反转

led2.value(not led.value())

while sw.value()==0: #while(当）开关按下时

pass # 什么也不做，暂停

副程序

#MINI.py

def hello():

print("hello")

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Python库 | machines-0.0.1.tar.gz

04-10

资源分类：Python库

所属语言：Python

资源全名：machines-0.0.1.tar.gz

资源来源：官方

安装方法：https://lanzao.blog.csdn.net/article/details/101784059

Python Machine-开源

04-26

Python IDE旨在与Glade一起使用以快速开发Pygtk应用程序

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【雕爷学编程】MicroPython手册之特定的库 machine — 与硬件相关的功能

雕爷学编程

09-14

291

例如，可以使用 machine 模块来控制 LED 的亮度、读取温度传感器的数据、与其他设备进行串行或并行通信等。在处理数据时，需要注意数据类型和长度的限制和转换。例如，可以使用 machine 模块来显示一些文本、图标、动画等，并根据需要进行滚动、旋转、缩放等变换。7、内置I/O驱动支持大量微控制器平台，如ESP8266、ESP32、STM32、micro:bit、掌控板和PyBoard等。它提供了一些用于创建和操作位图图像的类，可以使用不同的颜色格式和绘图方法来绘制像素、线条、矩形、文本等图形。

Machine Learning 库介绍

boyhailong的专栏

08-15

2114

原文地址：点击打开链接

最近找了一下Machine Learning方面的第三方库，感觉machine learning和视觉的结合越来越多，自己以后一定也会在处理视觉的问题中用到machine learning的方法，所谓“工欲善其事必先利其器”，因此打算熟悉一下第三

scalarstop:用于管理机器学习实验的Python框架

04-08

使用ScalarStop组织您的机器学习实验

ScalarStop是用Python编写的框架，可帮助您跟踪机器学习实验中的数据集，模型，超参数和训练指标。

安装

ScalarStop在PyPI上可用。您可以通过运行命令pip3 install scalarstop 。

用法

阅读，了解ScalarStop背后的核心概念以及如何构建数据集和模型。

之后，您可能想更深入地了解。通常，典型的ScalarStop工作流程包括四个步骤：

使用组织数据集。

使用描述您的机器学习模型架构。

使用加载，训练和保存机器学习模型。

使用参数和训练指标保存到SQLite或PostgreSQL数据库中。

MicroPython 特定的库 (MicroPython-specific) - machine

m0_50614038的博客

03-04

1150

以下库中提供了特定于 MicroPython 实现的功能。

咸鱼Micropython— machine库

咸鱼菌

04-02

6267

咸鱼Micropython— machine板级函数

提供和硬件相关的函数

复位相关函数

machine.reset()

设备复位，效果和按下复位键一样。

machine.reset_cause()

获取复位原因。

中断相关函数

machine.disable_irq()

禁止中断。返回先前的 IRQ 状态: False/True 对应 disabled/enabled IRQs，...

【MicroPython ESP32】machine.Pin类函数以及参数详解

perseverance51博客

09-01

2724

【MicroPython ESP32】machine.Pin类函数以及参数详解

咸鱼ESP32实例—点亮LED灯

咸鱼菌

04-30

4899

咸鱼ESP32实例—点亮LED灯

学硬件一般都是从LED开始，ESP32的也不例外啦。之后我们ESP32的测试板都是ZTWF的哦。

ZTWF开发板

点亮第一个 LED

ZTWF 上有 1 个 LED（绿色），控制 LED 使用 machine 中的 Pin 对象，

其构造函数和使用方法如下：

...

micropython machine库的相关功能

weixin_35756130的博客

01-04

631

很高兴为你解答。

MicroPython machine库是一个在MicroPython系统中用于控制硬件设备的库。它提供了许多功能，包括：

I2C通信：使用I2C协议进行通信，可以使用machine.I2C类进行操作。

PWM：可以使用machine.PWM类控制脉冲宽度调制的引脚。

UART通信：使用串行通信协议UART进行通信，可以使用machine.UART类进行操作。

睡眠和唤醒...

Deploy_Machine_Learning_Projects：该存储库包含使用Python，Django和其他技术部署AI，ML模型的示例

02-05

Deploy_Machine_Learning_Projects

该存储库包含使用Python，Django和其他技术部署AI，ML模型的示例。

为数据科学项目部署Flask应用程序-https: 这里为流行的IRIS数据集开发了ML模型，该模型作为pickel文件导出，则使用Flask代码加载pickle文件，并将其作为API公开。

使用Flask部署张量流深度学习模型-https:

使用Flask部署chatterbot chatbot代码-https:

使用Flask部署opencv模型-https:

neuralnet:用于使用前馈人工神经网络的 Python 实用程序

06-10

神经网络

用于使用前馈人工神经网络的 Python 实用程序

命令行使用

该实用程序可以从命令行运行，如下所示：

python neuralnet.py [-h] {new,train,eval} ...

可以使用三种不同的命令来创建新网络、训练它们并使用它们来评估数据。

创建新网络：

python neuralnet.py new /path/to/save/network.tnxt 2 3 1

上述命令将创建一个新的3层网络，分别由2个神经元、3个神经元和1个神经元组成，并保存到指定路径。

训练网络：

python neuralnet.py train /path/to/saved/network.txt trainingInput.txt trainingOutput.txt

上述命令将加载保存在指定路径上的网络，并根据提供的输入和输出数据对其进行训练。输入和输出数

MachineLearning_Pratice:机器学习算法案例实战，python实现

03-29

机器学习算法案例实战（python实现）

一。

1.加载数据

用熊猫加载

2.数据探索性分析及可视化

用matplotlib和seaborn对数据的标注（结果）进行。

3.特征处理

用pandas去除无关特征

用StandardScaler对数据进行标准化

4.模型训练

用train_test_split划分训练集和测试集

选择模型：SVM，决策树，随机森林，KNN

用GridSearchCV优化模型参数

用管道管道机制定制化分类器训练流程

5.模型评估

用对不同模型进行评估，。

二。

1.加载数据

用熊猫加载数据

数据索引说明：

时间：交易时间；金额：交易金额；类别：交易的分类，0表示正常（非欺诈），1表示欺诈V1，V2，……V28：出于利益，不知道这些特征代表的具体含义，只知道这28个特征值是通过PCA变换得到的结果

2.数据探索性分析及可视化

用matplotlib和sea

xss.pwnfunction.com靶机 Warmups

MACHINE中文(简体)翻译：剑桥词典

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中文 (简体)

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英语-中文（简体）

machine 在英语-中文（简体）词典中的翻译

machinenoun [ C ] uk

Your browser doesn't support HTML5 audio

/məˈʃiːn/ us

Your browser doesn't support HTML5 audio

/məˈʃiːn/

machine noun [C]

(PIECE OF EQUIPMENT)

Add to word list

A2 a piece of equipment with several moving parts that uses power to do a particular type of work

机器;机械装置

The different sizes of eggs are sorted by a machine.

鸡蛋由机器按大小分捡。

If I'm not home when you call, leave a message on the machine (= answering machine).

如打电话时我不在家，请在答录机上留言。

Don't forget to put the towels in the machine (= washing machine) before you go out.

出去前别忘了将毛巾放到洗衣机里。

I got some chocolate from a vending machine.

我从自动售货机里买了些巧克力。

更多范例减少例句Doctors kept him alive on a life-support machine.There is a vending machine on the platform that dispenses snacks.The machine emits a high-pitched sound when you press the button.This sewing machine is operated by a foot pedal.I need some coins for the ticket machine in the car park.

machine noun [C]

(COMPUTER)

a computer

计算机，电脑

You'll need a powerful machine for editing videos.

你需要一台功能强大的电脑来编辑图像。

machine noun [C]

(VEHICLE)

informal a vehicle, often a motorcycle

车辆（常指摩托车）

approving That's a mean (= powerful) machine you've got there, Bill.

比尔，你的摩托车马力可够大的。

machine noun [C]

(GROUP OF PEOPLE)

a group of people who control and organize something

核心组织，领导核心

Churchill's war machine

丘吉尔的战争机器

The party machine has swung into action with its preparation for the election.

政党机器已开始为选举做准备。

It's now up to the government's propaganda machine to restore the leader's image.

现在要靠政府的宣传机器来修复领导人的形象。

machineverb [ T ] uk

Your browser doesn't support HTML5 audio

/məˈʃiːn/ us

Your browser doesn't support HTML5 audio

/məˈʃiːn/

to sew cloth with a sewing machine

用缝纫机缝制

I've almost finished making the curtains - I just have to machine the hem.

窗帘我已经做得差不多了——只需用缝纫机缝一下边。

(machine在剑桥英语-中文（简体）词典的翻译 © Cambridge University Press)

machine的例句

machine

Typical linear pumping speed values in the present machines are about 20 l 0s 0m.

来自 Cambridge English Corpus

In addition, the size and general configuration of patented machines changed considerably in the decade before the brick tax was repealed.

来自 Cambridge English Corpus

Furthermore, machined jaws may not precisely comply with the specified maximal contact geometry.

来自 Cambridge English Corpus

The slower early machines generated few or no humancompetitive results, whereas the faster more recent machines have generated numerous human-competitive results.

来自 Cambridge English Corpus

All the improvements in machinery, however, have by no means been the invention of those who had occasion to use the machines.

来自 Cambridge English Corpus

A part and two sets of jaws were machined from aluminum stock.

来自 Cambridge English Corpus

The early lace machines were in fact developed from knitting machines, and drew on local reserves of capital, labour and technical knowledge.

来自 Cambridge English Corpus

We are a population that has embraced everyday technological 'communications' advances such as automatic teller machines, cable television, cable-less television and wireless telephones.

来自 Cambridge English Corpus

示例中的观点不代表剑桥词典编辑、剑桥大学出版社和其许可证颁发者的观点。

machine的翻译

中文（繁体）

機器, 機械裝置, 電腦…

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西班牙语

máquina, ordenador, máquina [feminine…

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葡萄牙语

máquina, computador, máquina [feminine]…

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更多语言

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土耳其语

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in Dutch

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丹麦语

in Swedish

马来语

德语

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in Urdu

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俄语

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阿拉伯语

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捷克语

印尼语

泰语

越南语

波兰语

韩语

意大利语

मशीन, यंत्र…

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機械, コンピュータ, 機械（きかい）…

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makine, sistem, düzen…

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machine [feminine], machine, usiner…

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màquina, ordinador…

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machine, machinaal bewerken, met de machine naaien…

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ஒரு குறிப்பிட்ட வகை வேலையைச் செய்ய சக்தியைப் பயன்படுத்தும் பல நகரும் பகுதிகளைக் கொண்ட ஒரு உபகரணம்…

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मशीन, यंत्र…

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યંત્ર, મશીન…

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maskine, -maskine, motorcykel…

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maskin, tillverka (bearbeta) med maskin, maskinsy…

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mesin, kenderaan, membentuk…

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die Maschine, maschinell bearbeiten, mit der Maschine nähen…

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maskin [masculine], maskin, kjøretøy…

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مشین…

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машина, піддавати механічній обробці, шити на машинці…

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механизм, машина, (организационный) аппарат…

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యంత్రం…

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آلة, حاسوب…

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নির্দিষ্ট ধরনের কাজ করার জন্যে শক্তিচালিত মেশিন…

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stroj, mašina, obrábět…

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mesin, kendaraan, membentuk…

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เครื่องจักร, ยานพาหนะ, ทำด้วยเครื่องจักร…

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cỗ máy, phương tiện đi lại, gia công trên máy…

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maszyna, machina, system…

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기계, 컴퓨터…

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macchina, computer, fare/eseguire a macchina…

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machine的发音是什么？

在英语词典中查看 machine 的释义

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Machiavellian

Machiavellianism

machinate

machinations

machine

machine carding

machine code

machine gun

machine learning

machine更多的中文(简体)翻译

全部

fog machine

machine gun

machine-gun

cash machine

coffee machine

drinks machine

drum machine

查看全部意思»

惯用语

a cog in a/the machine idiom

“每日一词”

healthspan

Your browser doesn't support HTML5 audio

/ˈhelθ.spæn/

Your browser doesn't support HTML5 audio

/ˈhelθ.spæn/

the number of years that someone lives or can expect to live in reasonably good health

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Forget doing it or forget to do it? Avoiding common mistakes with verb patterns (2)

March 06, 2024

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stochastic parrot

March 04, 2024

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Journals

Machines

Integrating Computer Vision and CAD for Precise Dimension Extraction and 3D Solid Model Regeneration for Enhanced Quality Assurance

A Novel Customised Load Adaptive Framework for Induction Motor Fault Classification Utilising MFPT Bearing Dataset

Obstacle Avoidance in Operational Configuration Space Kinematic Control of Redundant Serial Manipulators

Journal Description

Machines

is an international, peer-reviewed, open access journal on machinery and engineering published monthly online by MDPI. The IFToMM is affiliated with Machines and its members receive a discount on the article processing charges.

Open Access— free for readers, with article processing charges (APC) paid by authors or their institutions.

High Visibility: indexed within Scopus, SCIE (Web of Science), Inspec, and other databases.

Journal Rank: JCR - Q2 (Engineering, Mechanical)

Rapid Publication: manuscripts are peer-reviewed and a first

decision is provided to authors approximately 15.6 days after submission; acceptance

to publication is undertaken in 2.8 days (median values for papers published in

this journal in the second half of 2023).

Recognition of Reviewers: reviewers who provide timely, thorough peer-review reports receive vouchers entitling them to a discount on the APC of their next publication in any MDPI journal, in appreciation of the work done.

Impact Factor:

2.6 (2022);

5-Year Impact Factor:

2.8 (2022)

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Open Access

ISSN: 2075-1702

Latest Articles

36 pages, 1860 KiB

Open AccessReview

Machine Learning, Mechatronics, and Stretch Forming: A History of Innovation in Manufacturing Engineering

Cosmin Constantin Grigoras, Valentin Zichil, Vlad Andrei Ciubotariu and Stefan Marius Cosa

Machines 2024, 12(3), 180; https://doi.org/10.3390/machines12030180 - 07 Mar 2024

Abstract

[...] Read more.

This review focuses on the complex connections between machine learning, mechatronics, and stretch forming, offering valuable insights that can lay the groundwork for future research. It provides an overview of the origins and fundamentals of these fields, emphasizes notable progress, and explores the influence of these fields on society and industry. Also highlighted is the progress of robotics research and particularities in the field of sheet metal forming and its various applications. This review paper focuses on presenting the latest technological advancements and the integrations of these fields from their beginnings to the present days, providing insights into future research directions.

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(This article belongs to the Special Issue Selected Papers from OPROTEH 2023: 18th International Conference of Constructive Design and Technological Optimization in Machine Building)

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14 pages, 4191 KiB

Open AccessArticle

Graph Convolutional Network Based on CQT Spectrogram for Bearing Fault Diagnosis

Jin Yan, Jianbin Liao, Weiwei Zhang, Jinliang Dai, Chaoming Huang, Hanlin Li and Hongliang Yu

Machines 2024, 12(3), 179; https://doi.org/10.3390/machines12030179 - 07 Mar 2024

Abstract

[...] Read more.

In this paper, a graph convolutional network is constructed and applied for bearing fault diagnosis. Specifically, the constant-Q transform (CQT) is first adopted for spectral analysis of vibration signals, where the frequencies are distributed in the logarithmic scale. Varied frequency resolutions can be obtained to satisfy the spectral resolution requirement and reduce signal dimension. Afterwards, the CQT spectrum is modeled by a graph, where nodes are frequency bins and edges reflect the inner relationship of different bins. There are edges between the fundamental and harmonic components. Then, a two-layer graph convolutional network (GCN) is utilized to assess the significance of vibration sources within the mixed signals. Finally, the bearing faults are determined according to the output of the GCN. To the best of our knowledge, this is the first work to model the vibration signal in this graph structure. The advantage of this approach lies in the simplification of edge definitions, facilitating shared connectivity relationships between the fundamental frequency and harmonics. Its performance was compared with another state-of-the-art fault diagnosis model. Experimental results demonstrate that the proposed model obtains higher accuracy, and it is more effective in extracting discriminative features.

Full article

(This article belongs to the Section Machines Testing and Maintenance)

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18 pages, 8556 KiB

Open AccessArticle

Field-Weakening Strategy with Modulated Predictive Current Control Applied to Six-Phase Induction Machines

Magno Ayala, Jesus Doval-Gandoy, Jorge Rodas, Osvaldo Gonzalez, Raúl Gregor, Larizza Delorme, Carlos Romero and Ariel Fleitas

Machines 2024, 12(3), 178; https://doi.org/10.3390/machines12030178 - 06 Mar 2024

Abstract

[...] Read more.

The predictive current controller has arisen as a practicable technique for operating multiphase machines due to its fast dynamic response, control flexibility, and overall good performance. However, this type of controller has limitations, e.g., it tends to suffer from steady-state tracking errors in (d−q) currents; high computational burden; and high (x−y) currents, which become more pronounced at higher speeds, thereby worsening its sustainability. While some proposals have addressed these limitations by incorporating modulation stages and new cost functions, there is still room for improvement, particularly at higher speeds. In line with the pursuit of sustainable advancements, this article explores the integration of a field-weakening strategy with a modulated predictive current controller applied to a six-phase induction machine to improve its performance at current tracking for higher speed ranges. Experimental tests were conducted to validate the effectiveness of the proposed controller, assessing stator current tracking, reduction in the (x−y) currents, and the total harmonic distortion.

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(This article belongs to the Section Electrical Machines and Drives)

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14 pages, 5249 KiB

Open AccessArticle

Erosion Analysis and Optimal Design of Sand Resistant Pipe Fittings

Xiaoning Song, Kaifu Mi, Yu Lei, Zhengyang Li and Dongjia Yan

Machines 2024, 12(3), 177; https://doi.org/10.3390/machines12030177 - 05 Mar 2024

Abstract

[...] Read more.

Erosion of solid particles in a pipe elbow containing a 90° angle is investigated by simulation methods. In the process of shale gas exploitation, the impact of solid particles carried by fluid on the inner surface wall of pipes, as well as the turbulent flow, cause the erosion of pipes, which brings about heavy economic losses for the oil and gas industry. In the impact erosion of the inner surface wall of the pipe, the worst erosion occurs at the elbow. In this study, the erosion of a pipe elbow which has been widely used in actual production is analyzed, and the influence of the fluid velocity, the solid particle size, and the wall roughness on the erosion is investigated. Additionally, the simulation results of the erosion with the rebound and freeze boundary conditions are compared, indicating that setting the freeze boundary condition could significantly improve the computational efficiency by 74% with the acceptable accuracy. In order to reduce the impact erosion in the pipe elbow containing a 90° angle, an optimal design is proposed that can reduce the maximum erosion rate by 52.4%. These results complement the research of elbow erosion and provide ideas for the optimization problem of a pipe elbow containing a 90° angle.

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(This article belongs to the Section Machine Design and Theory)

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15 pages, 4496 KiB

Open AccessArticle

Trial Manufacture and Performance Research of Hydraulic Oil Tank for Three Kinds of Non-Metallic Materials

Zhiqiang He, Fugang Zhai, Changyu Tan, Xiaojun Chen, Tianshuo Chen and Pengpeng Ma

Machines 2024, 12(3), 176; https://doi.org/10.3390/machines12030176 - 05 Mar 2024

Abstract

[...] Read more.

With the increasing demand for lightweight construction machinery, it is of great significance to study non-metallic materials that can replace steel plates to make hydraulic oil tanks (HOTs). To explore the feasibility of making HOTs with three materials—cross-linked polyethylene (XLPE), polypropylene (PP), and nylon (PA)—this paper takes 28 L and 115 L volumes commonly used in construction machinery, such as forklifts and loaders, as the design volume and obtains non-metal HOT products of good forming quality by regulating the process parameters. Based on the test methods and evaluation bases of the fuel tank in the national standard, the normal-temperature pressure test, high-temperature pressure test, and low-temperature impact test are designed according to the working conditions of the HOTs. Finally, the non-metallic HOT products are tested. The results show that the rotational molding of XLPE material is the easiest, and products of all sizes can be molded, but the mechanical properties and thermal stability of the products are poor. The low-temperature impact resistance of PP products is poor. PA material can be used to create small HOTs, and the product performance is excellent. This research serves as a valuable reference for the non-metallic and lightweight design of HOTs.

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(This article belongs to the Section Machine Design and Theory)

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24 pages, 5435 KiB

Open AccessArticle

Temperature Prediction for 3 MW Wind-Turbine Gearbox Based on Thermal Network Model

Yi-Fan Cui, Ying-Hui Zhang, Wei-Dong He and Lian-Jun Dong

Machines 2024, 12(3), 175; https://doi.org/10.3390/machines12030175 - 04 Mar 2024

Abstract

[...] Read more.

Focusing on the investigation of a 3 MW wind-turbine gearbox, this paper’s aim is to address the challenge of turbine shutdown due to the internal oil temperature exceeding its limits. Additionally, there is the difficulty in measuring the internal temperature. To tackle these issues, a thermal network model for the entire gearbox was developed. This model is based on an analysis of the thermodynamic behavior of the three-stage transmission in the wind-turbine gearbox and internal oil-spray lubrication. Through this model, thermal balance equations were established to predict the steady-state temperatures under different operating conditions. This study delved into the calculation methods for the power loss of heat sources in thermodynamic balance equations and the calculation methods for different types of thermal resistance between nodes, forming an adapted computational process. Applying this model, simulated analyses yielded temperatures at various nodes and bearing temperatures under different operating conditions. These results were compared with actual SCADA data, and steady-state thermal simulations of the high-speed stages were conducted, demonstrating the model’s effectiveness in predicting steady-state temperatures for a large-megawatt wind-turbine gearbox. Furthermore, the model-based analysis explored the impact of the oil spray parameters on the gearbox temperature, providing a theoretical foundation for further anticipating overheating malfunctions and optimizing the internal cooling systems.

Full article

(This article belongs to the Section Turbomachinery)

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12 pages, 6554 KiB

Open AccessArticle

Two-Step PM Procedure for Fabrication of Super-Engineering Plastic Gears

Tatsuhiko Aizawa, Tomohiro Miyata and Kiyoyuki Endoh

Machines 2024, 12(3), 174; https://doi.org/10.3390/machines12030174 - 04 Mar 2024

Abstract

[...] Read more.

The two-step PM (powder metallurgy)-route procedure was proposed to fabricate a super-engineering plastic gear directly from powder feedstock. Its lightweight, fully dense integrity and high-stiffness has been found to be suitable for reducers in robotics and electric vehicles, as they work even in severe environmental conditions. In this study, the green compaction and sinter-forging processes were used to consolidate the polyimide powder feedstock and to sinter forge the solid preform into the final products. To demonstrate the high density of preforms and sinter-forged gears, a hardness measurement and X-ray computer tomography were employed. The gear-grade balancing was also evaluated to describe the effect of fine sinter-forging conditions on the dimensional quality of polyimide gears. High gear grade with JIS-2 class proved that the polyimide was useful as a matrix of lightweight and high-strength gears.

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(This article belongs to the Section Advanced Manufacturing)

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20 pages, 8594 KiB

Open AccessArticle

Comprehensive Performance Evaluation of an Unmanned Excavator Based on Signal Stability Extraction

Binrui Zhang, Min Ye, Gaoqi Lian, Yan Li and Baozhou Xia

Machines 2024, 12(3), 173; https://doi.org/10.3390/machines12030173 - 03 Mar 2024

Abstract

[...] Read more.

The comprehensive performance of unmanned excavators is crucial for the development and optimization of the field of construction machinery. To effectively improve the unmanned excavator to meet the needs of the market, it is imperative to quantify the evaluation method of the comprehensive performance of unmanned excavators. In this study, an evaluation method combining a fuzzy analytic hierarchy process and multivariate image area analysis method is proposed. Firstly, based on the feature extraction of the signal stability of the unmanned excavators, fifteen evaluation indexes were proposed. Then, the case study is used to obtain the scores corresponding to these indexes. The fuzzy analytic hierarchy process is applied to determine the relative weight of the selected evaluation criteria, in which the uncertain and imprecise judgments of decision makers are converted into fuzzy numbers. At the same time, the braking performance of the three types of unmanned excavators was comprehensively evaluated and ranked using the multivariate image area analysis method as an empirical example. Finally, a weight analysis is performed to check the robustness of the ranking results. The results show that the proposed method is effective and feasible. It provides a reference for the performance improvement and efficiency optimization of unmanned excavators.

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(This article belongs to the Section Machine Design and Theory)

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20 pages, 6691 KiB

Open AccessArticle

Design and Optimization of a Robot Dosing Device for Aliquoting of Biological Samples Based on Genetic Algorithms

Larisa Rybak, Giuseppe Carbone, Dmitry Malyshev and Artem Voloshkin

Machines 2024, 12(3), 172; https://doi.org/10.3390/machines12030172 - 01 Mar 2024

Abstract

[...] Read more.

Aliquoting of biological samples refers to the process of dividing a larger biological sample into smaller, representative portions known as aliquots. This procedure is commonly employed in laboratories, especially in fields like molecular biology, genetics, and clinical research. Currently, manual dosing devices are commonplace in laboratories, but they demand a significant amount of time for their manual operation. The automated dosing devices available are integrated into narrowly focused aliquoting systems and lack versatility as manipulator equipment. Addressing this limitation, a novel technical solution is proposed in this paper for a modular dosing device compatible with robotic manipulators. The paper introduces and details a mathematical model, optimizes its parameters, and constructs a detailed 3D model using the NX environment to demonstrate the engineering feasibility of our concept. It further outlines the development of a three-dimensional dynamic simulation model for the dosing device, comparing analytical calculations with simulation results. The construction of a dosing device prototype is discussed, followed by a comprehensive experimental validation.

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(This article belongs to the Special Issue Digital Twins in Robotics)

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Supplementary File 1 (ZIP, 102 KiB)

15 pages, 11573 KiB

Open AccessArticle

Image-Based Tool Characterization and DEM Simulation of Abrasive Brushing Processes

Anton Hoyer and Eckart Uhlmann

Machines 2024, 12(3), 171; https://doi.org/10.3390/machines12030171 - 01 Mar 2024

Abstract

[...] Read more.

Brushing with bonded abrasives is a finishing process used for deburring, edge rounding, and roughness reduction. However, due to the complex motion, chipping, and wear behavior of abrasive filaments, industrial brushing processes have historically relied on empirical knowledge. To gain a better understanding of filament interactions, a physical model based on the discrete element method was developed to simulate process forces and contact areas. Filament patterns of round brushes were determined through the use of laser line triangulation and image processing. These filament patterns showed interlocked filaments and yielded more accurate results when used in brushing simulations than the oversimplified square patterns, which were used in previous research. Simulation confirms the occurrence of filament interactions, distinguishes between sweeping and striking filament motions, and reveals dynamic behavior at high brushing velocities that may increase undesirable tool wear.

Full article

(This article belongs to the Special Issue Advances and Trends in Non-conventional, Abrasive and Precision Machining 2022)

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11 pages, 3150 KiB

Open AccessArticle

Cutting Performance and Tool Wear of AlCrN- and TiAlN-Coated Carbide Tools during Milling of Tantalum–Tungsten Alloy

Jiahao Wang, Zhengqing Liu, Yang Wu, Qiucheng Wang and Dayu Shu

Machines 2024, 12(3), 170; https://doi.org/10.3390/machines12030170 - 01 Mar 2024

Abstract

[...] Read more.

Tantalum–tungsten alloys have been widely used in different industrial sectors—for example, in chemical, medical, aerospace, and military equipment. However, they are usually difficult to cut because of the large cutting force, rapid tool wear, and poor surface finish during machining. This paper presents the machining performance and cutting tool wear of AlCrN/TiAlN-coated carbide tools during the milling process of Ta-2.5W. The effects of cutting parameters on the cutting forces and surface roughness of AlCrN/TiAlN-coated carbide tools were obtained and analyzed. The results show that the wear resistance of AlCrN-coated tools is better than that of TiAlN-coated tools, and that the main wear mechanisms of both cutting tools are crater wear, adhesive wear, and diffusion wear. Compared to TiAlN-coated tools, AlCrN-coated tools reduced the cutting forces by 1% to 15% and decreased the surface roughness by 6% to 20%. A cutting speed within the range of 80–120 m/min can ensure a low cutting force while maintaining good surface roughness, which is more conducive to machining Ta-2.5W.

Full article

(This article belongs to the Section Material Processing Technology)

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11 pages, 4219 KiB

Open AccessProject Report

Tool Wear Monitoring System Using Seq2Seq

Wang-Su Jeon and Sang-Yong Rhee

Machines 2024, 12(3), 169; https://doi.org/10.3390/machines12030169 - 01 Mar 2024

Abstract

[...] Read more.

The advancement of smart factories has brought about small quantity batch production. In multi-variety production, both materials and processing methods change constantly, resulting in irregular changes in the progression of tool wear, which is often affected by processing methods. This leads to changes in the timing of tool replacement, and failure to correctly determine this timing may result in substantial damage and financial loss. In this study, we sought to address the issue of incorrect timing for tool replacement by using a Seq2Seq model to predict tool wear. We also trained LSTM and GRU models to compare performance by using R2, mean absolute error (MAE), and mean squared error (MSE). The Seq2Seq model outperformed LSTM and GRU with an R2 of approximately 0.03~0.037 in step drill data, 0.540.57 in top metal data, and 0.16~0.45 in low metal data. Confirming that Seq2Seq exhibited the best performance, we established a real-time monitoring system to verify the prediction results obtained using the Seq2Seq model. It is anticipated that this monitoring system will help prevent accidents in advance.

Full article

(This article belongs to the Topic Predictive Analytics and Fault Diagnosis of Machines with Machine Learning Techniques)

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20 pages, 7105 KiB

Open AccessArticle

A Comparative Study of Efficient Modeling Approaches for Performing Controlled-Depth Abrasive Waterjet Pocket Milling

Nikolaos E. Karkalos and Panagiotis Karmiris-Obratański

Machines 2024, 12(3), 168; https://doi.org/10.3390/machines12030168 - 29 Feb 2024

Abstract

[...] Read more.

Non-conventional processes are considerably important for the machining of hard-to-cut alloys in various demanding applications. Given that the surface quality and integrity, dimensional accuracy, and productivity are important considerations in industrial practice, the prediction of the outcome of the material removal process should be able to be conducted with sufficient accuracy, taking into consideration the computational cost and difficulty of implementation of the relevant models. In the case of AWJ, various types of approaches have been already proposed, both relying on analytical or empirical models and developed by solving partial differential equations. As the creation of a model for AWJ pocket milling is rather demanding, given the number of parameters involved, in the present work, it is intended to compare the use of three different types of efficient modeling approaches for the prediction of the dimensions of pockets milled by AWJ technology. The models are developed and evaluated based on experimental results of AWJ pocket milling of a titanium workpiece by an eco-friendly walnut shell abrasive. The results indicate that a semi-empirical approach performs better than a two-step hybrid analytical/semi-empirical method regarding the selected cases, but both methods show promising results regarding the realistic representation of the pocket shape, which can be further improved by a probabilistic approach.

Full article

(This article belongs to the Special Issue Advances and Trends in Non-conventional, Abrasive and Precision Machining 2022)

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18 pages, 6758 KiB

Open AccessArticle

Advanced Learning Technique Based on Feature Differences of Moving Intervals for Detecting DC Series Arc Failures

Hoang-Long Dang, Sangshin Kwak and Seungdeog Choi

Machines 2024, 12(3), 167; https://doi.org/10.3390/machines12030167 - 28 Feb 2024

Abstract

[...] Read more.

DC microgrids are vital for integrating renewable energy sources into the grid, but they face the threat of DC arc faults, which can lead to malfunctions and fire hazards. Therefore, ensuring the secure and efficient operation of DC systems necessitates a comprehensive understanding of the characteristics of DC arc faults and the implementation of a reliable arc fault detection technique. Existing arc-fault detection methods often rely on time–frequency domain features and machine learning algorithms. In this study, we propose an advanced detection technique that utilizes a novel approach based on feature differences between moving intervals and advanced learning techniques (ALTs). The proposed method employs a unique approach by utilizing a time signal derived from power supply-side signals as a reference input. To operationalize the proposed method, a meticulous feature extraction process is employed on each dataset. Notably, the difference between features within distinct moving intervals is calculated, forming a set of differentials that encapsulate critical information about the evolving arc-fault conditions. These differentials are then channeled as inputs for advanced learning techniques, enhancing the model’s ability to discern intricate patterns indicative of DC arc faults. The results demonstrate the effectiveness and consistency of our approach across various scenarios, validating its potential to improve fault detection in DC systems.

Full article

(This article belongs to the Special Issue Integration and Implementation of AI in the Control and Monitoring of Electrical Machines, High Power Converters, and Energy Storage Systems)

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15 pages, 8557 KiB

Open AccessArticle

Machine Vision-Based Surface Defect Detection Study for Ceramic 3D Printing

Jing Zhou, Haili Li, Lin Lu and Ying Cheng

Machines 2024, 12(3), 166; https://doi.org/10.3390/machines12030166 - 28 Feb 2024

Abstract

[...] Read more.

A set of online inspection systems for surface defects based on machine vision was designed in response to the issue that extrusion molding ceramic 3D printing is prone to pits, bubbles, bulges, and other defects during the printing process that affect the mechanical properties of the printed products. The inspection system automatically identifies and locates defects in the printing process by inspecting the upper surface of the printing blank, and then feeds back to the control system to produce a layer of adjustment or stop the printing. Due to the conflict between the position of the camera and the extrusion head of the printer, the camera is placed at an angle, and the method of identifying the points and fitting the function to the data was used to correct the camera for aberrations. The region to be detected is extracted using the Otsu method (OSTU) on the acquired image, and the defects are detected using methods such as the Canny algorithm and Fast Fourier Transform, and the three defects are distinguished using the double threshold method. The experimental results show that the new aberration correction method can effectively minimize the effect of near-large selection caused by the tilted placement of the camera, and the accuracy of this system in detecting surface defects reached more than 97.2%, with a detection accuracy of 0.051 mm, which can meet the detection requirements. Using the weighting function to distinguish between its features and defects, and using the confusion matrix with the recall rate and precision as the evaluation indexes of this system, the results show that the detection system has accurate detection capability for the defects that occur during the printing process.

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(This article belongs to the Special Issue Design and Application of Advanced Manufacturing Systems)

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18 pages, 1280 KiB

Open AccessArticle

Sampled-Data Cooperative Adaptive Cruise Control for String-Stable Vehicle Platooning with Communication Delays: A Linear Matrix Inequality Approach

Yong Hoon Jang and Han Sol Kim

Machines 2024, 12(3), 165; https://doi.org/10.3390/machines12030165 - 28 Feb 2024

Abstract

[...] Read more.

This study aims to propose a sampled-data control technique, utilizing a linear matrix inequality (LMI) approach, to achieve string-stable vehicle platooning in a cooperative adaptive cruise control (CACC) system with communication delays. To do this, a decentralized sampled-data controller design technique that combines one controller using sensor measurements and another one utilizing vehicle-to-vehicle (V2V) communication, ensuring both individual and string stability, is proposed first. Next, a memory sampled-data control (MSC) approach is presented to account for transmission delays in V2V communication. Additionally, an improved Lyapunov–Krasovskii functional (LKF) is presented to improve computational complexity and sampling performance. The design conditions are formulated as linear matrix inequalities (LMIs) in the time domain, facilitating efficient stability analysis and optimization. Finally, vehicle platooning simulations are provided to validate the effectiveness and feasibility of the proposed technique.

Full article

(This article belongs to the Special Issue Autonomous Navigation of Mobile Robots and UAV)

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18 pages, 5354 KiB

Open AccessArticle

Proposed Feedback-Linearized Integral Sliding Mode Control for an Electro-Hydraulic Servo Material Testing Machine

Chungeng Sun, Jipeng Li, Ying Tan and Zhijie Duan

Machines 2024, 12(3), 164; https://doi.org/10.3390/machines12030164 - 28 Feb 2024

Abstract

[...] Read more.

High-precision tracking of an electro-hydraulic servo material testing machine’s force control system was achieved using a proposed integral sliding mode control method based on feedback linearization to improve the machine’s force control performance and anti-interference ability. First, the electro-hydraulic servo system’s nonlinear mathematical model was established, and its input–output linearization was realized using differential geometry theory. Second, integral sliding mode control was introduced into the controller and the feedback-linearized integral sliding mode controller was designed. The controller’s stability was proven based on the Lyapunov stability principle. Finally, a simulation model of the electro-hydraulic servo material testing machine’s force control system was established using AMESim/Simulink software. The designed controller was simulated and verified, and the control effects of the system’s different amplitudes and frequency signals were analyzed. The results showed that the feedback-linearized integral sliding mode control algorithm could effectively improve the system’s force tracking accuracy and parameter adaptability, yielding better robustness and a better control effect.

Full article

(This article belongs to the Special Issue Advanced Control and Fault Detection Techniques in Hydraulic Machines and Systems)

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20 pages, 23042 KiB

Open AccessArticle

Design, Assembly and Control of a Differential/Omnidirectional Mobile Robot through Additive Manufacturing

Erick Axel Padilla-García, Raúl Dalí Cruz-Morales, Jaime González-Sierra, David Tinoco-Varela and María R. Lorenzo-Gerónimo

Machines 2024, 12(3), 163; https://doi.org/10.3390/machines12030163 - 28 Feb 2024

Abstract

[...] Read more.

Although additive manufacturing is a relatively new technology, it has been widely accepted by industry and academia due to the wide variety of prototypes that can be built. Furthermore, using mobile robots to carry out different tasks allows greater flexibility than using manipulator robots. In that sense, and based on those above, this article focuses on the design and assembly of a multi-configurable mobile robot that is capable of changing from a differential to an omnidirectional configuration. For this purpose, a sequential mechatronic design/control methodology was implemented to obtain an affordable platform via additive manufacturing which is easily scalable and allows the user to change from one configuration to another. As a proof of concept, this change is made manually. Fabrication, construction, and assembly processes for both structures are presented. Then, a hierarchical control law is designed. In this sense and based on Lyapunov’s method, a low-level controller is developed to control the angular speed of the wheels to a desired angular speed, and a medium-level controller controls the robot’s attitude to follow a desired Cartesian trajectory. Finally, the control strategies are implemented in both prototype configurations, and through experimental results, the theoretical analysis and the construction of the mobile robot are validated.

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(This article belongs to the Special Issue Design and Control of Mobile Robots)

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18 pages, 5495 KiB

Open AccessArticle

An Analysis of the Kinematical Characteristics of an Eccentric Curve-Face Gear Pair with Compound Motion

Chunjiang He, Jinxu Zhang and Chao Lin

Machines 2024, 12(3), 162; https://doi.org/10.3390/machines12030162 - 27 Feb 2024

Abstract

[...] Read more.

An atypical face gear pair with complex transmission motion can be used in intermittent reciprocating mechanisms with more precise transmission and a much higher capacity than conventional mechanisms, such as cams and linkages. In this study, we derive a mathematical equation for the complex tooth surface of this gear pair. We indicate the change in root cutting, top sharpening and the effective width of the tooth surface with different parameters. Additionally, we derive the governing equation for the kinematical characteristics of this eccentric curve-face gear pair with a rigid–flexible coupling system, revealing the continuous intermittent contact principle of this gear type with different parameters. Boundary conditions for the gear pair are proposed, demonstrating that the vibration of the gear pair is more obvious, even at a low velocity. In addition, the critical velocity, which mostly ranges from 300 rpm to 400 rpm, is affected by the stiffness of the frames and the parameters of the tooth surfaces. The interval space and interval time of the intermittent contact system are Δd≤0.3 mm and Δt≤5.6×10−4 s, with visible surface sliding on the contact area. It is shown that the contact points are firstly concentrated at the outer part of the tooth surface and that the meshing will break off at the first tooth with the minimum inner radius RGi−min. These theoretical results, which have been verified experimentally, provide theoretical support for further analysis and the better application of this unconventional gear pair.

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(This article belongs to the Section Machine Design and Theory)

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13 pages, 3043 KiB

Open AccessArticle

Predicting Assembly Geometric Errors Based on Transformer Neural Networks

Wu Wang, Hua Li, Pei Liu, Botong Niu, Jing Sun and Boge Wen

Machines 2024, 12(3), 161; https://doi.org/10.3390/machines12030161 - 27 Feb 2024

Abstract

[...] Read more.

Using optimal assembly relationships, companies can enhance product quality without significantly increasing production costs. However, predicting Assembly Geometric Errors presents a challenging real-world problem in the manufacturing domain. To address this challenge, this paper introduces a highly efficient Transformer-based neural network model known as Predicting Assembly Geometric Errors based on Transformer (PAGEformer). This model accurately captures long-range assembly relationships and predicts final assembly errors. The proposed model incorporates two unique features: firstly, an enhanced self-attention mechanism to more effectively handle long-range dependencies, and secondly, the generation of positional information regarding gaps and fillings to better capture assembly relationships. This paper collected actual assembly data for folding rudder blades for unmanned aerial vehicles and established a Mechanical Assembly Relationship Dataset (MARD) for a comparative study. To further illustrate PAGEformer performance, we conducted extensive testing on a large-scale dataset and performed ablation experiments. The experimental results demonstrated a 15.3% improvement in PAGEformer accuracy compared to ARIMA on the MARD. On the ETH, Weather, and ECL open datasets, PAGEformer accuracy increased by 15.17%, 17.17%, and 9.5%, respectively, compared to the mainstream neural network models.

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(This article belongs to the Special Issue Recent Trends in Sensor Fusion Algorithms Using Intelligent Signal Processing Methods)

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machine（英文单词）_百度百科

ine（英文单词）_百度百科网页新闻贴吧知道网盘图片视频地图文库资讯采购百科百度首页登录注册进入词条全站搜索帮助首页秒懂百科特色百科知识专题加入百科百科团队权威合作下载百科APP个人中心machine是一个多义词，请在下列义项上选择浏览（共2个义项）添加义项收藏查看我的收藏0有用+10machine播报讨论上传视频英文单词machine，英文单词，名词、动词，作名词时意为“机械，机器；机构；机械般工作的人，人名；(意)马基内”，作动词时意为“用机器制造”。外文名machine词性名词、动词单词发音英[məˈʃiːn]美[məˈʃiːn]目录1短语搭配2双语例句短语搭配播报编辑Machine Learning [计] 机器学习 ; 机械学习 ; 自动 ; 机僻习Turing machine 图灵机 ; 杜林机 ; 图录机simple machine [机] 简单机械 ; 简单机器Drum machine 鼓机 ; 电子鼓 ; 鼓乐机器 ; 唱片战电子饱slot machine 角子机 ; 自动售货机 ; 自动贩卖机FLAT MACHINE 平车 ; 横机 ; [纺] 针织横机 ; 平面抛光机fax machine 传真机 ; 图文传真机 ; 传真 ; 电话传真机Machine Weight 机器重量 ; 整机重量 ; 机械重量 ; 机器质量MACHINE MAINTENANCE 机械保养 ; 机器保养 ; 机修 ; 机疲养 [1]双语例句播报编辑What do the farmers do with the machine?农民们用这台机器来做什么？They made the machine all by themselves.这机器完全是他们自己制造的。You like in time and space of time machine, go back after, I lost your memory.你像是在时空中的时光机，时间倒流以后，我失去了你的记忆。 [1]新手上路成长任务编辑入门编辑规则本人编辑我有疑问内容质疑在线客服官方贴吧意见反馈投诉建议举报不良信息未通过词条申诉投诉侵权信息封禁查询与解封©2024 Baidu 使用百度前必读 | 百科协议 | 隐私政策 | 百度百科合作平台 | 京ICP证030173号京公网安备110000020000

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machine是什么意思_machine怎么读_machine翻译_用法_发音_词组_同反义词_机器_机械-新东方在线英语词典

英语词典 -

日语词典

首页 > 英语词典 > 字母单词表 > m开头的单词 > machine

machine

听听怎么读

英 [məˈʃi:n]

美 [məˈʃin]

是什么意思

n.机器，机械；机械般的人；核心；vt.用机器制造，用机器加工；vi.被机器切削；

变形

复数：machines过去式：machined过去分词：machined现在分词：machining第三人称单数：machines

双语释义

n.(名词)[C]机器,机械 an instrument or apparatus which uses power, such as electricity to perform workv.(动词)vt. 用机器制造,用机器加工 make or produce by machine, especially in sewing and printing; produce according to exact measurements

英英释义

machine[ mə'ʃi:n ]n.any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasksan intricate organization that accomplishes its goals efficiently"the war machine"an efficient person"the boxer was a magnificent fighting machine"a motor vehicle with four wheels; usually propelled by an internal combustion engine同义词：carautoautomobilemotorcara group that controls the activities of a political party"he was endorsed by the Democratic machine"同义词：political machinea device for overcoming resistance at one point by applying force at some other point同义词：simple machinev.turn, shape, mold, or otherwise finish by machinerymake by machinery

学习怎么用

词汇搭配

用作名词 (n.)动词+～build a machine制造机器control a machine控制机器design a machine设计机器fix a machine安装机器fuel a machine给机器加油have a machine in operation使机器运转look after machine看管机器manage a machine操纵机器oil a machine给机器上油operate a machine操作机器pilot a machine操纵机器put together a machine安装机器run a machine操作机器shut down a machine关机器take a machine to pieces拆卸机器take down a machine拆机器形容词+～calculating machine计算机copying machine复印机earth-moving machine推土机hand-operated machine手工操作的机器milking machine挤奶机powerful machine大功率机器printing machine印刷机sewing machine缝纫机washing machine洗衣机word-processing machine文字处理机political machine政治机构名词+～farm machine农业机械money-access machine存取款机X-ray machineX光透视机party machine党的机构state machine国家机器～+名词machine gun机关枪machine language机器语言,计算机语言machine tool机床介词+～made by machine机械制造的life of a machine机器的寿命teams of machines成套的机器用作动词 (v.)～+副词machine advantageously有利地用机器加工machine automatically自动地用机器加工machine completely完全用机器加工machine conditionally有条件地用机器加工machine confidently满怀信心地用机器加工machine critically紧急地用机器加工machine directly直接用机器加工machine extensively大规模地用机器加工machine finally最终用机器加工machine fitly适度地用机器加工machine hastily草率地用机器加工machine impossibly不可能用机器加工machine laudably值得赞许地用机器加工machine logically合理地用机器加工machine marvelously奇迹般地用机器制造machine mechanically机械地用机器制造machine particularly特别地用机器制造machine persistently固执地用机器制造machine punctually准时用机器制造machine scientifically科学地用机器制造machine secretly秘密地用机器制造machine strictly严格地用机器制造machine systematically有规律地用机器制造machine unconditionally无条件地用机器制造machine unwillingly勉强用机器制造machine widely大规模地用机器制造

词组短语

machine tool机床cutting machine[建]切削机，切割机；裁切机，裁剪机；截煤机；下料压力机washing machine洗衣机，洗涤机milling machine铣床welding machine焊机；焊接机molding machine造型机；铸模机grinding machine磨床；研磨机；砂轮机nc machine数控机床sewing machine缝纫机；锁线装订机printing machine n. 印刷机 machine learning机器学习（能力）；机器改进（能力）injection molding machine注模机；注压机paper machine造纸机testing machine试验机casting machine熔铸机，铸造设备machine vision机器视觉；计算机视觉packaging machine包装机，包装机械；打包机；封装机drilling machine钻床；钻孔机packing machine包装机；打包机knitting machine针织机；编织机更多收起词组短语

同近义词辨析

machinery, engine, motor, apparatus, mechanism, machine这组词都有“机器，装置”的意思，其区别是：machinery指机器的总称。engine既可泛指或大或小、简单或复杂的机械、机器，又可指产生动力的发动机或引擎。motor通常指小型或轻型马达、发动机。apparatus指具有特殊用途的装置。mechanism指运行系统，简单的机械装置。machine普通用词，泛指一切机器。

双语例句

用作名词(n.)This machine has been specially adapted for underwater use.这机器是为水下使用而特别改装的。My mother-in-law has a sewing machine.我婆婆有一台缝纫机。The team is a well-oiled machine right now.这个团队现在运转十分良好。He criticized those who had turned politics into a money machine.他指责那些将政治转变为赚钱工具的人。That's a mean machine you've got there.你的那辆车很抢眼。用作动词(v.)It will take less time to machine the curtains than to sew them by hand.用机器织窗帘比用手工缝花的时间要少。

权威例句

Genetic Algorithms in Search, Optimization and Machine LearningGenetic Algorithm in Search Optimization and Machine LearningGenetic Algorithms in Search, Optimization and Machine LearningGenetic algorithm is search optimization and machine learningScikit-learn: Machine Learning in PythonMeer, P.: Mean shift: A Robust Approach Toward Feature Space Analysis. IEEE Transactions on Pattern Analysis and Machine Intelligenc...UCI Machine Learning RepositoryIEEE Transactions on Pattern Analysis and Machine IntelligenceVirtual machine monitors: Xen and the art of virtualization...classification using machine learning techniques

同义词robot

organization

house 同根词machinist

machinery

machinelike

machine

machination m开头的单词mystery shopper

mystery story

myoglobin isoenzyme of creatine kinase

mystery novel

myosin light chain kinase

myotonic dystrophy

myocardial infarction

mycoplasma pneumonia

mycosis fungoides

myeloid stem cell

mycobacterium tuberculosis

Mycophenolate Mofetil 词汇所属分类Sherlock Holmes 神探夏洛克第一季

十二只猴子第二季

《绝望的主妇》(Desperate Housewives) 全八季词频大全

复仇者联盟2：奥创纪元 Avengers: Age of Ultron

星际穿越 Interstellar

终结者2（Terminator 2: Judgment Day）字母词汇表更多l开头的单词LZ

Lytton

lyttae

lytta

Lytle

lytic

v开头的单词vyingly

vying

vycor

vyborg

VxWorks

VXI

y开头的单词YYC

ywis

YWCA

yvonne

Yvette 分类词汇表更多文学艺术zinc

zephyr

yellow

wrought iron

writer

worship

初中zookeeper

zoo

Zig Zag

zero

zebra crossing

zebra

其他词汇书zymurgy

zymurgy

zymoscope

zymology

zygote 人名姓氏表更多男zack

zachary

Zachariah

young

York

Yates

女Zola

Zoe

Zenobia

Zenia

Zena

Zandra

男/女Yong

wynn

winter

willie

Whitney

wally 新东方柯林斯词典托福考试练习雅思预测2024年雅思考试重点题汇总[听力|阅读|写作|口语]

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machine 在英語-中文（繁體）詞典中的翻譯

machinenoun [ C ] uk

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/məˈʃiːn/ us

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/məˈʃiːn/

machine noun [C]

(PIECE OF EQUIPMENT)

Add to word list

A2 a piece of equipment with several moving parts that uses power to do a particular type of work

機器;機械裝置

The different sizes of eggs are sorted by a machine.

雞蛋由機器按大小分撿。

If I'm not home when you call, leave a message on the machine (= answering machine).

如果你打電話時我不在家，請在答錄機上留言。

Don't forget to put the towels in the machine (= washing machine) before you go out.

出去前別忘了將毛巾放到洗衣機裡。

I got some chocolate from a vending machine.

我從販賣機裡買了些巧克力。

更多範例减少例句Doctors kept him alive on a life-support machine.There is a vending machine on the platform that dispenses snacks.The machine emits a high-pitched sound when you press the button.This sewing machine is operated by a foot pedal.I need some coins for the ticket machine in the car park.

machine noun [C]

(COMPUTER)

a computer

電腦

You'll need a powerful machine for editing videos.

你需要一台功能強大的電腦來編輯圖像。

machine noun [C]

(VEHICLE)

informal a vehicle, often a motorcycle

車輛（常指機車）

approving That's a mean (= powerful) machine you've got there, Bill.

比爾，你的機車馬力可真大。

machine noun [C]

(GROUP OF PEOPLE)

a group of people who control and organize something

核心組織，領導核心

Churchill's war machine

邱吉爾的戰爭機器

The party machine has swung into action with its preparation for the election.

政黨機器已開始為選舉做準備。

It's now up to the government's propaganda machine to restore the leader's image.

現在要靠政府的宣傳機器來重建領導人的形象。

machineverb [ T ] uk

Your browser doesn't support HTML5 audio

/məˈʃiːn/ us

Your browser doesn't support HTML5 audio

/məˈʃiːn/

to sew cloth with a sewing machine

用縫紉機縫製

I've almost finished making the curtains - I just have to machine the hem.

窗簾我已經做得差不多了——只需用縫紉機縫一下邊。

machine的例句

machine

To put it explicitly, experts do not brainwash jurors the way that machines do.

來自 Cambridge English Corpus

A part and two sets of jaws were machined from aluminum stock.

來自 Cambridge English Corpus

The researchers developed a standardized protocol using different imaging machines, utilizing both a structural and a living phantom to calibrate the machines.

來自 Cambridge English Corpus

We are a population that has embraced everyday technological 'communications' advances such as automatic teller machines, cable television, cable-less television and wireless telephones.

來自 Cambridge English Corpus

During the first setup, the hole pattern, both steps, and the counterbored hole will be machined.

來自 Cambridge English Corpus

Today's biologists routinely scrounge resources from university machines or borrow time on home computers.

來自 Cambridge English Corpus

Many of the machines which have been purchased have not been formally evaluated by robust criteria.

來自 Cambridge English Corpus

The simplest bipedal machines are passive dynamic9,12,13,17,18 and ballistic11,15,19 walking models that have only few degrees of freedom.

來自 Cambridge English Corpus

示例中的觀點不代表劍橋詞典編輯、劍橋大學出版社和其許可證頒發者的觀點。

machine的翻譯

中文（簡體）

机器, 机械装置, 计算机…

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西班牙語

máquina, ordenador, máquina [feminine…

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葡萄牙語

máquina, computador, máquina [feminine]…

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मशीन, यंत्र…

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在英語詞典中查看 machine 的釋義

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fog machine

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a cog in a/the machine idiom

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/ˈhelθ.spæn/

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the number of years that someone lives or can expect to live in reasonably good health

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MACHINE | English meaning - Cambridge Dictionary

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English

Meaning of machine in English

machinenoun [ C ] uk

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/məˈʃiːn/ us

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/məˈʃiːn/

machine noun [C]

(PIECE OF EQUIPMENT)

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A2 a piece of equipment with several moving parts that uses power to do a particular type of work: The different sizes of eggs are sorted by a machine. If I'm not home when you call, leave a message on the machine (= answering machine). Don't forget to put the towels in the machine (= washing machine) before you go out. I got from a vending machine.

More examplesFewer examplesDoctors kept him alive on a life-support machine.There is a vending machine on the platform that dispenses snacks.The machine emits a high-pitched sound when you press the button.This sewing machine is operated by a foot pedal.I need some coins for the ticket machine in the car park.

SMART Vocabulary: related words and phrases

Machines - general words

3-D printer

animatronic

automated

automation

backhoe

chuck

coffee machine

convenience

crankshaft

Heath Robinson

humanoid

immobilizer

roller

snow thrower

stacker

stump grinder

supersensitivity

synchrotron

valve

workhorse

See more results »

machine noun [C]

(COMPUTER)

a computer: You'll need a powerful machine for editing videos.

SMART Vocabulary: related words and phrases

Computer hardware

3-D printer

agnostic

associative memory

backlight

backlighting

blackberry

client-server

console

electronic organizer

flat screen

hard drive

mainframe

microprocessor

non-mobile

number pad

optical character reader

optical reader

optically

patch

plug and play

See more results »

machine noun [C]

(VEHICLE)

informal a vehicle, often a motorcycle: approving That's a mean (= powerful) machine you've got there, Bill.

SMART Vocabulary: related words and phrases

Road vehicles in general

airboard

all-terrain vehicle

amphibian

ATV

autorickshaw

craft

diesel

HEV

HOV

hoverboard

hybrid

hybrid electric vehicle

motor vehicle

motorcade

non-motorized

rover

snow groomer

snowcat

vehicle

vehicular

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You can also find related words, phrases, and synonyms in the topics:

Motorbikes

machine noun [C]

(GROUP OF PEOPLE)

a group of people who control and organize something: Churchill's war machine The party machine has swung into action with its preparation for the election. It's now up to the government's propaganda machine to restore the leader's image.

SMART Vocabulary: related words and phrases

Groups of people

alliance

anti-gang

assemblage

baby boomer

federative

First Nation

first people

flashmob

flock

line (someone) up

mafia

mob

phalanx

posse

public

quaternity

quintet

scratch

syndicate

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machineverb [ T ] uk

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/məˈʃiːn/ us

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/məˈʃiːn/

to sew cloth with a sewing machine: I've almost finished making the curtains - I just have to machine the hem.

to cut or shape metal on a machine: Tungsten carbide tools are used extensively for machining steel.

SMART Vocabulary: related words and phrases

Knitting & sewing

appliqué

appliquéd

Aran

Bargello

baste

handknit

handknitted

hank

hem

intarsia

overcast

quilting

reknit

resew

rib

run something up

running stitch

sampler

seam

sew

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You can also find related words, phrases, and synonyms in the topics:

Chemistry: metals & metalworking

machine | American Dictionary

machinenoun [ C ] us

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/məˈʃin/

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a device with moving parts that uses power to do work of a particular type: a sewing/washing machine an answering machine

politics & government A machine is also a group of people who control a political organization: He was a product of an old-line party machine.

machine | Business English

machinenoun [ C ] uk

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/məˈʃiːn/ us

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Add to word list

PRODUCTION a piece of equipment with moving parts that uses power to do a particular type of work: The machines were designed to make bottles from recycled plastic.operate/use a machine Now only a few people are required to operate the computerized machines. install/service a machine Soft drink companies began installing vending machines in schools. Is the machine working again? a machine breaks down The machine broke down and we had to call someone to come and mend it. a washing/sewing/copying machine Slowly feed the paper into the copying machine.a machine for (doing) sth He invented a machine for setting type. They use a special machine to scan the bone. by machine The votes are counted by machine. a machine operator/maker

IT a computer: You'll need a powerful machine for editing videos. Most machines running these programs have poor network connections.

a group of people who control and organize something: political/publicity machine The publicity machine will not quit when the book tour grinds to a halt. The hard left wanted ministers to be accountable to the party machine. His business empire has grown into a well-oiled machine.

Machine Learning: 十大机器学习算法 - 知乎

Machine Learning: 十大机器学习算法 - 知乎首发于睿哥杂货铺切换模式写文章登录/注册Machine Learning: 十大机器学习算法RiboseYimEngineer & Writer机器学习算法分类：监督学习、无监督学习、强化学习基本的机器学习算法：线性回归、支持向量机(SVM)、最近邻居(KNN)、逻辑回归、决策树、k平均、随机森林、朴素贝叶斯、降维、梯度增强公式、图示、案例机器学习算法大致可以分为三类：监督学习算法 (Supervised Algorithms）:在监督学习训练过程中，可以由训练数据集学到或建立一个模式（函数 / learning model），并依此模式推测新的实例。该算法要求特定的输入/输出，首先需要决定使用哪种数据作为范例。例如，文字识别应用中一个手写的字符，或一行手写文字。主要算法包括神经网络、支持向量机、最近邻居法、朴素贝叶斯法、决策树等。无监督学习算法 (Unsupervised Algorithms):这类算法没有特定的目标输出，算法将数据集分为不同的组。强化学习算法 (Reinforcement Algorithms):强化学习普适性强，主要基于决策进行训练，算法根据输出结果（决策）的成功或错误来训练自己，通过大量经验训练优化后的算法将能够给出较好的预测。类似有机体在环境给予的奖励或惩罚的刺激下，逐步形成对刺激的预期，产生能获得最大利益的习惯性行为。在运筹学和控制论的语境下，强化学习被称作“近似动态规划”（approximate dynamic programming，ADP）。基本的机器学习算法：线性回归算法 Linear Regression支持向量机算法 (Support Vector Machine,SVM)最近邻居/k-近邻算法 (K-Nearest Neighbors,KNN)逻辑回归算法 Logistic Regression决策树算法 Decision Treek-平均算法 K-Means随机森林算法 Random Forest朴素贝叶斯算法 Naive Bayes降维算法 Dimensional Reduction梯度增强算法 Gradient Boosting1. 线性回归算法 Linear Regression回归分析（Regression Analysis）是统计学的数据分析方法，目的在于了解两个或多个变量间是否相关、相关方向与强度，并建立数学模型以便观察特定变量来预测其它变量的变化情况。线性回归算法（Linear Regression）的建模过程就是使用数据点来寻找最佳拟合线。公式，y = mx + c，其中 y 是因变量，x 是自变量，利用给定的数据集求 m 和 c 的值。线性回归又分为两种类型，即简单线性回归（simple linear regression)，只有 1 个自变量；*多变量回归（multiple regression)，至少两组以上自变量。下面是一个线性回归示例：基于 Python scikit-learn 工具包描述。2. 支持向量机算法(Support Vector Machine,SVM)支持向量机/网络算法(SVM)属于分类型算法。SVM模型将实例表示为空间中的点，将使用一条直线分隔数据点。需要注意的是，支持向量机需要对输入数据进行完全标记，仅直接适用于两类任务，应用将多类任务需要减少到几个二元问题。3. 最近邻居/k-近邻算法 (K-Nearest Neighbors,KNN)KNN算法是一种基于实例的学习，或者是局部近似和将所有计算推迟到分类之后的惰性学习。用最近的邻居（k）来预测未知数据点。k 值是预测精度的一个关键因素，无论是分类还是回归，衡量邻居的权重都非常有用，较近邻居的权重比较远邻居的权重大。KNN 算法的缺点是对数据的局部结构非常敏感。计算量大，需要对数据进行规范化处理，使每个数据点都在相同的范围。延伸：KNN 的一个缺点是依赖于整个训练数据集，学习向量量化（Learning Vector Quantization，LVQ)是一种监督学习的人神经网络算法，允许你选择训练实例。LVQ 由数据驱动，搜索距离它最近的两个神经元，对于同类神经元采取拉拢，异类神经元采取排斥，最终得到数据的分布模式。如果基于 KNN 可以获得较好的数据集分类效果，利用 LVQ 可以减少存储训练数据集存储规模。典型的学习矢量量化算法有LVQ1、LVQ2和LVQ3，尤以LVQ2的应用最为广泛。4. 逻辑回归算法 Logistic Regression逻辑回归算法（Logistic Regression）一般用于需要明确输出的场景，如某些事件的发生（预测是否会发生降雨）。通常，逻辑回归使用某种函数将概率值压缩到某一特定范围。例如，Sigmoid 函数（S 函数）是一种具有 S 形曲线、用于二元分类的函数。它将发生某事件的概率值转换为 0, 1 的范围表示。Y = E ^（b0＋b1 x）/（1 + E ^（b0＋b1 x ））以上是一个简单的逻辑回归方程，B0，B1是常数。这些常数值将被计算获得，以确保预测值和实际值之间的误差最小。5. 决策树算法 Decision Tree决策树（Decision tree）是一种特殊的树结构，由一个决策图和可能的结果（例如成本和风险）组成，用来辅助决策。机器学习中，决策树是一个预测模型，树中每个节点表示某个对象，而每个分叉路径则代表某个可能的属性值，而每个叶节点则对应从根节点到该叶节点所经历的路径所表示的对象的值。决策树仅有单一输出，通常该算法用于解决分类问题。一个决策树包含三种类型的节点：决策节点：通常用矩形框来表示机会节点：通常用圆圈来表示终结点：通常用三角形来表示简单决策树算法案例，确定人群中谁喜欢使用信用卡。考虑人群的年龄和婚姻状况，如果年龄在30岁或是已婚，人们更倾向于选择信用卡，反之则更少。通过确定合适的属性来定义更多的类别，可以进一步扩展此决策树。在这个例子中，如果一个人结婚了，他超过30岁，他们更有可能拥有信用卡（100% 偏好）。测试数据用于生成决策树。注意：对于那些各类别样本数量不一致的数据，在决策树当中信息增益的结果偏向于那些具有更多数值的特征。6. k-平均算法 K-Meansk-平均算法(K-Means)是一种无监督学习算法，为聚类问题提供了一种解决方案。K-Means 算法把 n 个点（可以是样本的一次观察或一个实例）划分到 k 个集群（cluster），使得每个点都属于离他最近的均值（即聚类中心，centroid）对应的集群。重复上述过程一直持续到重心不改变。7. 随机森林算法 Random Forest随机森林算法（Random Forest）的名称由 1995 年由贝尔实验室提出的random decision forests 而来，正如它的名字所说的那样，随机森林可以看作一个决策树的集合。随机森林中每棵决策树估计一个分类，这个过程称为“投票（vote）”。理想情况下，我们根据每棵决策树的每个投票，选择最多投票的分类。PaperRandom Forest |Leo Breiman | Statistics Department University of California Berkeley8. 朴素贝叶斯算法 Naive Bayes朴素贝叶斯算法（Naive Bayes）基于概率论的贝叶斯定理，应用非常广泛，从文本分类、垃圾邮件过滤器、医疗诊断等等。朴素贝叶斯适用于特征之间的相互独立的场景，例如利用花瓣的长度和宽度来预测花的类型。“朴素”的内涵可以理解为特征和特征之间独立性强。与朴素贝叶斯算法密切相关的一个概念是最大似然估计(Maximum likelihood estimation)，历史上大部分的最大似然估计理论也都是在贝叶斯统计中得到大发展。例如，建立人口身高模型，很难有人力与物力去统计全国每个人的身高，但是可以通过采样，获取部分人的身高，然后通过最大似然估计来获取分布的均值与方差。Naive Bayes is called naive because it assumes that each input variable is independent.9. 降维算法 Dimensional Reduction在机器学习和统计学领域，降维是指在限定条件下，降低随机变量个数，得到一组“不相关”主变量的过程，并可进一步细分为特征选择和特征提取两大方法。一些数据集可能包含许多难以处理的变量。特别是资源丰富的情况下，系统中的数据将非常详细。在这种情况下，数据集可能包含数千个变量，其中大多数变量也可能是不必要的。在这种情况下，几乎不可能确定对我们的预测影响最大的变量。此时，我们需要使用降维算法，降维的过程中也可能需要用到其他算法，例如借用随机森林，决策树来识别最重要的变量。10. 梯度增强算法 Gradient Boosting梯度增强算法（Gradient Boosting）使用多个弱算法来创建更强大的精确算法。它与使用单个估计量不同，而是使用多个估计量创建一个更稳定和更健壮的算法。梯度增强算法有几种：XGBoost — 使用线性和树算法LightGBM — 只使用基于树的算法梯度增强算法的特点是精度较高。此外，LightGBM 算法具有令人难以置信的高性能。扩展阅读:发布于 2018-02-13 01:21机器学习深度学习（Deep Learning）人工智能赞同 162925 条评论分享喜欢收藏申请转载文章被以下专栏收录睿哥杂货铺愿交天下士，罄我

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