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조임 회전력에 따른 치과 임플랜트 지대나사의 응력에 관한 연구
이원주,임주환,조인호,Lee, Won-Joo,Lim, Ju-Hwan,Cho, In-Ho 대한치과보철학회 1998 대한치과보철학회지 Vol.36 No.5
Abutment screw loosening of implant restorations is a common problem in the treatment of dental implant. The purpose of this study was to calculate stress and preload from the elongation measurements and to determine maximum tightening torque without plastic deformation of the screw. The length of each gold alloy UCLA screw was measured after tightening to the manufacturer's recommended torque of 32 N-cm. Similarity, titanium UCLA screws were measured after tightening to the manufacturer's recommended torque of 20 N-cm. Loosening torque was also measured after tightening to 32 N-cm torque for gold alloy abutment screws and 20 N-cm for titanium abutment screws. The results were as follows ; 1. There was a regressive relationship between screw elongation and tightening torque (gold alloy : $r^2=0.987$, titanium : $r^2=0.978$), and the mean preload calculated from elongation measurements was $501.11{\pm}26.85\;N$ (gold alloy) and $399.43{\pm}7.61\;N$ (titanium). 2. Stress calculated for the gold alloy and titanium screws at maximum recommended tightening torque was less than 60% of their respective yield strengths and with-in the elastic range. Maximum tightening torque without plastic deformation was 61 N-cm (gold alloy) and 39 N-cm (titanium). 3. For titanium screws, there was a significant difference between loosening after trial 1 and loosening after trials 2 to 5 (p<0.05). No statistically significant difference was seen in mean loosening torques between the first and subsequent trials for gold alloy screws.
A Submesh Allocation Scheme Based on Classification of Tasks and Submeshes
이원주,전창호,Lee, Won-Joo,Jeon, Chang-Ho Korea Information Processing Society 2003 정보처리학회논문지 A Vol.10 No.6
본 논문에서는 메쉬 구조 다중컴퓨터 시스템을 위한 새로운 서브메쉬 할당방법을 제안한다. 이 할당방법의 특징은 유형별 가용 서브메쉬 리스트를 사용하여 가용 서브메쉬의 탐색시간을 줄이는 것이다. 이 할당방법은 메쉬 구조에서 탐색한 독립 가용 서브메쉬들을 유형(정방형, 가로 직사각형, 세로 직사각형)에 따라 분류하여 유형별 가용 서브메쉬 리스트를 생성한다. 그리고 태스크의 유형과 동일한 유형별 가용 서브메쉬 리스트에서 먼저 최적의 서브메쉬를 찾음으로써 서브메쉬의 탐색시간을 줄인다. 만약 가용 서브메쉬를 찾지 못할 경우에는 각 독립 가용 서브메쉬의 속성으로 저장된 확장지수를 사용하여 서브메쉬의 크기를 확장한 후 최적의 가용 서브메쉬를 찾는다. 시뮬레이션을 통하여 본 논문에서 제안하는 서브메쉬 할당방법이 서브메쉬 탐색시간을 줄이는 면에서 기존의 할당방법에 비해 우수함을 보인다. This paper presents a new submesh allocation scheme for mesh-connected multicomputer systems. The key idea in the proposed allocation scheme is to reduce the submesh search time using classified free submesh lists (CFSL). This scheme reduces the submesh search time by classifying independent free submeshes according to their types (square, horizontal rectangle, vertical rectangle) and searching the best-fit submesh from the classified free submesh list. When no suitable submesh is found, the search can be continued by using the expansion index (El), which is stored as an attribute of each submesh, is used to form a larger submesh. Through simulation, we show that the proposed strategy improves the performance compared to previous strategies with respect to submesh search time.
이원주(Won-Joo Lee),이상준(Sang-Jun Lee),임헌용(Heon-Yong Lim),김창현(Chang-Hyeon Kim) 한국컴퓨터정보학회 2012 韓國컴퓨터情報學會論文誌 Vol.17 No.7
본 논문에서는 효율적인물류관리를위하여물류프로세스와현장 업무환경을 고려한 모바일물류정보시스템을 구현한다. 모바일 물류정보시스템은 물류센터의 전체 업무 프로세스를 실시간으로 수행할 수 있으며, ERP 및 POS 시스템과의 연계로 업무의 효율성을 강화시키는 시스템이다. 또한 서비스와 전체 공급망의 관리 수준을 향상시키는 시스템이다. 기존의물류 관련 업무는 전산화 및 자동화가 되지 않아작업자 경험과 관례에 의존하여 작업을 진행하기 때문에 비효율적인 관리가 이루어지고 있으며 물류 현황 통제력 약화로 물류의 품질이 저하되는 문제점이 있다. 이러한 문제점을 해결하기 본 논문에서는 모바일 물류정보시스템을 구축하여 실물 현장 중심의 실시간 운영 모니터링 환경을 제공하고, 현장업무 효율성 충족 및 최적화 된 시스템 기능을 제공하고자 한다. 또한 신규 물류 시스템으로 안정적 물류 정보지원과 새로운 ERP 및 관련 시스템과의 견고한 인터페이스로 시장 확대와 성장에 따른 물동량 증가에 적절하게 대응할 수 있도록 한다. In this paper, we implement an m-LIS(Mobile-Logistics Information System) for an effective logistics management in consideration of logistics process and work environment. The m-LIS could perform the entire business process every minute and promote the work efficiency by tying up with ERP and POS system. Moreover, this system could enhance the management level of service and supply chain. Due to the reason that the existing logistics business was not computerized and automated, most of operation was accomplished by means of workers experience and convention. This problem brought about both the ineffective management and logistics quality deterioration by weakening the control power of the logistics site. In order to solve this problem, we put focus on providing the real-time operation monitoring environment on the spot, the satisfaction of the efficiency on the spot, and the optimized system by building up the logistics information system. Furthermore, we attest that the new logistics system could properly cope with the increase of the quantity of goods transported owing to stable logistics information support and the market expansion and growth caused by the firm interface between the new ERP and its related system.