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원뿔형 인체분할을 이용한 용융 적층 방식 소형 인체 마네킨 3D 프린팅의 지지 구조 최소화
김성민,설인환,Kim, Sungmin,Sul, In Hwan 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.3
3D printing was adopted to create a miniature human manikin. One of the disadvantages of 3D printing, especially fused deposition modeling type, is the need for a support structure for overhangs. The support structure can be waste of raw filament in a way, and also harms the surface smoothness of the final printed product. To minimize the amount of support structure, human body parts were dissected into cone-shaped segments by automatically finding bone and surface feature points. A commercial 3D printer was used and the printed manikins with and without body segmentation technique were compared quantitatively. Our cone-shaped segmentation-based printing scheme showed dramatically less amount of support structure and more smooth surfaces on most segments, except for non-cube shapes such as the head, hands, and feet.
웹 기반 디지털 텍스타일 프린팅 의복 디자인 시스템 개발
김성민,Kim, Sungmin 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.3
A web-based custom garment design system was developed that enables users to design their own garment by placing various images and texts on three-dimensional (3D) garment models generating the image data for digital textile printing (DTP). An image mapping software was developed to test the mapping of images and texts on 3D garment models. Garment models were prepared by specially designed drape simulation software that provides DTP-ready pattern data along with the garment models. A common gateway interface (CGI) software module and a test server were developed using the core of the image mapping software. Users can design various customized garments in 3D using this CGI software on any device type or operating system as long as they have access to the Internet. Finally, the designed garment is converted into a single image that can be directly used for DTP garment production.
김성민(Sungmin Kim) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
This paper presents the requirement of teleoperation system for autonomous vehicle. To derive the requirements, we firstly have researched ToD (Tele-operated Driving) related works: standards, papers, patents, and interviews of global ToD solution providers and then identified two key features ‘Total Latency’ and ‘Network Bandwidth’ for stable ToD. ToD solution consists of many systems; i.e. Camera, Control, In-vehicle Network, Graphic User Interface, etc. In this paper, we focus on Camera and In-vehicle Network System which mostly impact the above two key features. For the Camera system, FHD (Full-HD, 1920x1080) resolution is the minimum requirement. Also, 5Mbps or above bitrate is needed to recognize objects clearly around the vehicle when video streaming from the camera on the vehicle is compressed by H.264 codec. or the In-vehicle Network system, a kind of supplement technologies such as channel bonding, etc. are required to maintain the telecom network bandwidth and latency being stable on even 5G telecom network.
하이퍼센트릭 광학계를 이용한 구조 조명 형상 측정 방법
김성민(Sungmin Kim),조민국(Minguk Cho),이맹진(Maengjin Lee),한준구(Joonku Hahn) 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.12
Depth extraction using the structured illumination method is popularly applied since it has the benefit of measuring the object without contact. With multiple spatial frequencies and phase-shifting techniques, it is possible to extract the depth of objects with large discontinuity. For applications such as 3D (Three Dimensional) displays, 3D information of the object is required and is useful if corresponding to each view of the display. For this purpose, hypercentric optics is appropriate to measure the depth information of an object with a large field of view that is applicable for a 3D display. By experiment, we present the feasibility for phase-shifting profilometry using hypercentric optics to obtain the depth information of an object with the field of view appropriate for a 3D display.
김성민(Sungmin Kim),노상훈(Sanghoon Rho),신승철(Seungcheol Shin) 한국정보과학회 2011 정보과학회논문지 : 소프트웨어 및 응용 Vol.38 No.7
산업자동화 분야에 널리 사용되는 컨트롤러 PLC는 그래픽 언어 래더 다이어그램(Ladder Diagram: LD)을 사용한다. LD프로그램의 검증을 위해서 검증 조건 생성기 Why를 이용해 증명거리를 생성하고 정리증명기 Coq으로 증명하는 방법을 보인다. 이런 방식을 LD에 적용하기 위해서는 LD프로그램을 Why의 명세언어로 작성하고 검증명세를 부여해야 한다. 본 논문은 LD프로그램을 Why 명세언어로 변환한 후에 Why를 통해서 LD프로그램을 검증하는 과정을 보여준다. A special-purpose microcontroller PLC, widely used in industrial automation, is using a specially designed graphical language LD(Ladder Diagram). This paper proposes a method to use a verification condition generator Why for verifying LD programs. For proof of the verification requirement you can use a theorem prover such as Coq to prove the proof obligations. In order to apply Why to LD programs, LD programs should be represented in the why specification and verification requirements be given. This paper shows the verification process of LD programs by using automatic translation and Why.
나일론으로 제작된 모형 가두리의 조류와 파랑에 따른 거동해석
김성민(Sungmin Kim),김재희(Jaehee Kim),김지은(Jieun Kim),이지훈(Jihoon, Lee) 전남대학교 어업기술연구소 2015 어업기술연구소보고지 Vol.8 No.1
가두리는 그물로 도피 방지시설을 만들어 어류를 양식하는 방법으로 해양 환경에 의한 다양한 외력을 받으며, 이러한 외력에 의한 거동과 변형은 가두리 시스템 자체의 안전성에 영향을 줄 뿐만 아니라 양식하는 생물의 안전성에도 영향을 미친다. 따라서 가두리의 설계단계에서 해양환경요인인 유속에 대한 가두리의 형상변화와 장력변화 및 파랑에 대한 가두리의 장력변화를 모형 가두리를 제작하여 실험하였다. 1. 유속이 0.0m/s에서 0.6m/s까지 0.1m/s씩 일정하게 증가함에 따라 가두리의 형상 변화가 증가하였고 0.3m/s에서 크게 변화하였다. 2. 유속이 0.0m/s에서 0.6m/s까지 0.1m/s씩 일정하게 증가함에 따라 실험오차가 있었지만 일반적으로 감소하는 경향을 보였다. 3. 유속이 0.0m/s에서 0.6m/s까지 0.1m/s씩 일정하게 증가함에 따라 가두리의 장력이 증가하였고 0.2m/s에서부터 급격하고 선형적으로 증가하였다. 4. 면과 모서리방향의 경우 형상변화와 단면적 크기 및 장력의 차이가 심하지 않았다. 5. 파고가 15cm로 일정 할 때 파랑의 주기별 (1.1s, 1.5s, 2.0s, 2.5s. 3.0s) 장력은 주기가 증가함에 따라 장력은 감소하였고 특히, 1.1s에서 1.5s의 사이의 장력이 급격히 감소하였다. In case of open sea cage aquaculture, the shape of cage nets is more likely to be changed than aquaculture in coastal waters due to marine environmental conditions such as current or waves. Such changes of the cage nets greatly influence on the safety of themselves and cultivation of marine products. This study was conducted to investigate the effects of tidal current, from among various marine environmental conditions, on cage nets. The cage net was made of copper alloy and floating pipes was made in the octagonal shape. The change of the shape, tension, and cross-sectional area of cage nets according to the flow rate was experimented and the change of tension of cage nets according to the wave period was tested. From the experiments, As the current speed increases, the shape change of the cage nets also increased. The change ratio of the shape of cage nets was the highest at the flow rate of 0.3m/s. In addition, the faster the current speed is, the more the cross-sectional area of cage nets changed. There was no significant difference between the direction of sides and the direction of edges. The tension of cage nets increased as the current speed increased. Same as the change of the cross-sectional area, the increase rates of tension were similar for both the direction of sides and the direction of edges. The tension of cage nets according to the wave period decreased as the wave period increased. It decreased most dramatically at the wave period of 1.5s.