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선박해양 구조물의 배관 자재 관리를 위한 Enterprise BOM 의 설계와 구현 사례
이장현(Lee, Jang Hyun),김승현(Kim, Seung Hyun),이황범(Lee, Hwang Beom),장기삼(Jang, Gi Sam) (사)한국CDE학회 2010 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2010 No.1
Both enterprise information systems and CAD utilizes the BOM (Bill of Material) as the means of collaborative integration during the product design and production since the BOM has been commonly used for design, production planning, procurement, and production works. Therefore, BOM can be the referential data when it expresses not only the part lists but also product information required by product development process. Outfitting design is one of major design works in marine vessel design since marine vessels have various outfitting systems and huge number of parts. Also, the outfitting BOM has the evolutional forms that change from the initial design to the production design. In order to express the product information and part list in the enterprise BOM and the evolutional BOMs in each lifecycles, enterprise BOM of outfitting that consists of structure BOM and display BOM is suggested. Thereafter, we have developed the prototype of enterprise BOM in which some features of the outfitting BOM are implemented.
PD -슬라이딩 모드 제어의 절환을 통한 강인한 SPMSM 속도 제어기 설계
손주범(Ju-Beom Son),서영수(Young-Soo Seo),이장명(Jang-Myung Lee) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.3
The paper proposes a new type of robust speed control strategy for permanent magnet synchronous motor by using PD-sliding mode hybrid control. The PD control has a good performance in the transient region while the sliding mode controller provides the robustness against system uncertainties. Taking advantages of the two control strategies, the proposed control method utilizes the PD control in the approaching region to the sliding surface and the sliding mode control near at the sliding surfaces. The chattering problem of the sliding mode controller is eliminated by applying the saturation function for the switching function of the sliding mode control. The stability of the sliding mode control is verified by using Lyapunov function with the proper selection of variable gains. It is shown that with this simple switching algorithm, stability of the overall hybrid control system is ensured. Through the simulations, the PD-sliding mode algorithm is shown to have a good performance in the transient response as well as being robust against disturbances. The robustness of the PD-sliding mode algorithm is further demonstrated against various external disturbances in the real experiments of SPMSM motor control.
선박 외판 성형에서 목적 형상과 전개 평판의 최적 정합을 위한 ICP(Iterative Closest Point) 알고리즘 적용
이장현(Jang Hyun Lee),윤종성(Jong Sung Yoon),류철호(Cheolho Ryu),이황범(Hwang Beom Lee) (사)한국CDE학회 2009 한국CDE학회 논문집 Vol.14 No.2
Generally, curved surfaces of ship hull are deformed by flame bending (line heating), multi-press forming, and die-less forming method. The forming methods generate the required in-plane/bending strain or displacement on the flat plate to make the curved surface. Multi-press forming imposes the forced displacements on the flat plate by controlling the position of each pressing points based upon the shape difference between the unfolded flat plate and the curved object shape. The flat plate has been obtained from the unfolding system that is independent of the ship CAD. Apparently, the curved surface and the unfolded-flat surface are expressed by different coordinate systems. Therefore, one of the issues is to find a registration of the unfolded surface and the curved shape for the purpose of minimum amount of forming works by comparing the two surfaces. This paper presents an efficient algorithm to get an optimized registration of two different surfaces in the multi-press forming of ship hull plate forming. The algorithm is based upon the ICP (Iterative Closest Point) algorithm. The algorithm consists of two iterative procedures including a transformation matrix and the closest points to minimize the distance between the unfolded surface and curved surfaces. Thereby the algorithm allows the minimized forming works in ship-hull forming.
고속 슬라이딩모드 관측기를 이용한 PMSM 센서리스 속도제어
손주범(Ju-Beom Son),김홍렬(Hong-Ryel Kim),서영수(Young-Soo Seo),이장명(Jang-Myung Lee) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.3
The paper proposes a sensorless speed control strategy for a PMSM (Permanent Magnet Synchronous Motor) based on a new SMO (Sliding Mode Observer), which substitutes a signum function with a sigmoid function. To apply robust sensorless control of PMSM against parameter fluctuations and disturbance, the high speed SMO is proposed, which estimates the rotor position and angular velocity from the back EMF. The low-pass filter and additional position compensation of the rotor are used to reduce the chattering problem commonly found in sliding mode observer with signum function, which becomes possible by applying the sigmoid function with the control of a switching function. Also the proposed sliding mode observer with the sigmoid function has better efficiency than the conventional sliding mode observer since it adjusts the observer gain by variable boundary layer and estimates the stator resistance. The stability of the proposed sliding mode observer is verified by the Lyapunov second method in determining the observer gain. The validity of the proposed high speed PMSM sensorless velocity control has been demonstrated by real experiments.
고일석,이장범,조동욱,Ko Il Seok,Lee Jang Beom,Cho Dong Uk 한국정보처리학회 2005 정보처리학회논문지D Vol.12 No.3
모바일 게임 콘텐트 제작과 서비스 기술 수준의 향상은 모바일 게임 시장의 폭발적인 증가를 가져오고 있다. 현재 서비스 되고 있는 모바일 게임은 WAP 방식과 다운로드 방식을 사용하고 있다. 기존에 구현된 모바일 게임 콘텐트는 구현과정의 기술적인 문제로 인해 WAP->다운로드, 다운로드->WAP으로 이어지는 연동 콘텐트를 구현할 수 없었다. 본 연구에서는 WAP->다운로드, 다운로드->WAP로 이어지는 무무선 연동을 혼합적으로 사용한 모바일 게임 콘텐트를 설계하고 구현하였다. 제안 방식은 WAP게임과 다운로드 게임 간에 실시간으로 연동 자료를 공유함으로써 기존의 게임 콘텐트가 가질 수 없었던 랭킹과 스테이지의 연동이 가능하게 하였다. An improvement of a mobile game content production and a service technology are bringing an explosive increase of a mobile game market. Currently serviced mobile games are using a WAP method and a download method. Because of technical problems, we couldn't develop the mobile game content which sequentially linked WAP->download and download->WAP. In this study, we design and develop the mobile game content which sequentially linked WAP->download and download->WAP. In the proposed method, we can linked the stage and the ranking information as sharing a data on real time that it is impossible in the previous mobile game content.
심부정맥혈전증 검사시 Tracker 기법의 유용성 평가
이윤상(Yun Sang Lee),이준협(Jun Hyub Lee),남진현(Jin Hyun Nam),박성수(Seong Soo Park),이경숙(Kyung Sook Lee),이장범(Jang Beom Lee),최태규(Tae Kyu Choi) 대한CT영상기술학회 2009 대한CT영상기술학회지 Vol.11 No.1
Purpose In deep vein thrombosis test, 180sec latency test, one of existing test methods, has less accuracy of diagnosis because the image of venous thrombosis may be shown differently according to the status of cardiac output, artery occlusion, etc. thus in the present study, an attempt was made to look into the clinical availability of the new test method of performing test at the peak of a time-threshold curve for popliteal veins by using tracker method of multi-detector computed tomography. Materials and methods A retrospective study was made for total 32 patients consisting of 16 patients who took the existing test and 16 patients who took the new test among patients who visited the hospital between May and July 2008 and took deep vein thrombosis test. Using tracker method of the new test method, threshold was set to be high for popliteal veins, and tracking was started 50 seconds after beginning angiography, and when the tracking time curve started to bend downward from the peak of the threshold, test was done together with injection of a cell line in order to reduce arteriography. After test, comparison on the images between existing test method and new one was made and they went through statistical analysis, and based on these, the availability of those images in deep vein thrombosis test was evaluated. Results For thrombosis parts of total 32 patients who took deep vein thrombosis diagnosis, in existing test group, they were mainly found in large blood vessels of the pelvis and abdomen by order of iliac veins, femoral veins, and popliteal veins, while in new test group, they were equally found in popliteal veins, iliac veins, and femoral veins. This result implies that the existing test method has limitations in identifying the extent of the proximal portion for venous thrombosis according to the patient’s cardiac output, artery occlusion, etc. On the other hand, it was pointed out that the new test method showed a highly contrast-enhanced image of arteries, but the quality of image of venous phase could be raised by injection of a cell line. As a result of analysis by statistics of independent sample t-test between existing test group and new test group, a significance level was shown to be(p<0.05)p=0.008, which indicates there was statistically significant difference. Conclusion In the new test method, significantly high incidence of thrombosis was found with development of multi detector computed tomography, thus the new test method is deemed as more useful method in terms of objectivity and accuracy of diagnosis, compared to the existing test method. It is concluded that more prospective studies are required to be made for establishment of protocol with many cases.