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Extrusion is a metal forming process involving shaping a metal billet (hot or cold) by forcing it through a die with an opening. The two possible schemes of extrusion are presented in the picture: The metal billet is placed to the container of the extrusion press. The die with an opening is mounted at the end of the container. When the hydraulically driven ram presses the billet, the metal start..

Drawing is a metal forming process involving pulling a workpiece (cold or hot) through a die providing reduction of the cross section of the workpiece. The drawing process employs a series of dies with opening of similar shape and of size which is slightly reduced in each consequent die. As the cross section decreases after passing each die, the length of workpiece increases, requiring correspon..

http://www.substech.com/dokuwiki/doku.php?id=deep_drawing Deep drawing is a cold metal forming process, in which a flat metal blank is forced into a die cavity by hydraulically driven punch. A cup-like cylindrical part, having the depth greater than its diameter, is formed as a result of deep drawing. The process is presented in the picture: Typical stages of a deep drawing process are as follow..

http://www.3ders.org/articles/20141213-ancient-mathematical-technique-applied-to-3d-printed-stereographic-lampshade.html Ancient mathematical technique applied to 3D printed stereographic lampshade Dec 13, 2014 | By Kira Everything old is new again—even when it comes to 3D printing. Mathematician Jason Cole was inspired by a classic technique that goes as far back ancient Greece in order to crea..

http://www.livescience.com/37513-how-3d-printers-work-infographic.html

Burnishing http://www.substech.com/dokuwiki/doku.php?id=burnishing Burnishing is a cold working process in which the surface layer of a work piece is plastically deformed by a hard tool: either roller or sliding ball. Benefits of burnishing The surface of a machined part has a profile composed of alternating irregular micro-asperities (peaks)and micro-valleys. The roughness level of the surface ..

Network Card 연결 유/무 를 확인한다. 현재 ubuntu 18.04 (Centos같음)이상부터는 ifconfig -> ip addr 로 대체되는 등 없어지거나 대체된 것들이 있다. nmcli d를 설치 할려면 아래와 같이 설치하면된다. (ficonfig 작동) Redhat rpm -q net-tools Debian apt install net-tools

1. 캐리어(Carrier) 관련 여러 용어들 ㅇ [통신 일반] 반송파 (搬送波) > 변조, 주파수천이, 주파수분배현황 - 정보가 포함되어 변조되는 높은 주파수의 파형을 말함 . 통상 대역폭을 갖으므로, 반송파 주파수를 가리킬 때는, 중심 주파수를 씀 ㅇ [통신 변조/전송 방식] - 억압 반송파 변조방식 > DSB-SC . 전력 소모가 큰 반송파를 억제하는 진폭변조 방식 - 단일이 아닌 여러 반송파를 함께 사용 > 다중 반송파 전송방식, 부반송파 ㅇ [LAN] 반송파의 감지 > Carrier Sensing - 유선 LAN,무선 LAN 통신에서 공유매체의 사용 여부를 감지하는 기능 ㅇ [사업자 구분] 사업자로서의 캐리어 > ILEC, CLEC, IXC 등 - 전화 사업자의 의미도 있음 ㅇ [도체/반도체] ..

리눅스 시스템 확인 방법 # cat /proc/version Linux version 2.6.18-53.1.14.el5 (mockbuild@builder6.centos.org) (gcc version 4.1.2 20070626 (Red Hat 4.1.2-14)) #1 SMP Wed Mar 5 11:36:49 EST 2008 확인하겠지만 우분투도 리눅스 계열입니다. 리눅스 확인하는 명령어나, 리눅스 버전확인하는 명령어는 출력하는게 다름니다. CPU 코어 전체 개수 # grep -c processor /proc/cpuinfo 현재 버철박스에서 구동하고있다. 결과는 아마 가상머신때문에 0으로 표시되는거 같다. 물리 CPU 수 grep "physical id" /proc/cpuinfo | sort -u | wc..

추가자료 Kubernetes Engine : https://cloud.google.com/kubernetes-engine/docs Kubernetes : https://kubernetes.io Google Cloud Build : https://cloud.google.com/cloud-build/docs Google Container Registry : https://cloud.google.com/container-regitry/docs Google App Engine : https://cloud.google.com/appengine/docs Google App Engine 가변형 환경 : https://cloud.google.com/appengine/docs/flexible Google App Engi..