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이형우,Lee, Hyoung-Woo 한국마린엔지니어링학회 2006 한국마린엔지니어링학회지 Vol.30 No.8
A new CVT, the inner spherical traction CVT (ISCVT) is introduced. Transmission of the most scooters is the self-controlled variable pulley-belt type of CVT having some disadvantages in the fuel consumption and the limitation of the transmittable power due to the slippage between the belt and pulley. Unlike this, ISCVT controlled directly by driver is more efficient and the contact mechanism having the same line of contact normal of the spherical rotors of different radii on common center causes that the power density and torque capacity are remarkably improved. The prototype with the specifications of 50cc scooter is designed and tested.
집적영상에서 효율적인 물체움직임 추정 및 차 영상 기법을 이용한 서브영상의 고속 압축
이형우,김은수,Lee, Hyoung-Woo,Kim, Eun-Soo 한국정보통신학회 2012 한국정보통신학회논문지 Vol.16 No.12
본 논문에서는 서브영상(sub-image)에 MSE(mean square error)기반의 블록정합 알고리즘인 TSS (three-step search)와 FS (full search)를 복합적으로 적용함으로써 물체움직임을 고속, 정밀하게 추정 보상하고, 차 영상 기법을 통해 공간적 중복데이터를 제거한 잔여영상(residual image)을 고속 압축할 수 있는 새로운 기법을 제시하였다. 즉, 제안된 기법에서는 픽업된 영상 간의 유사성을 향상시키기 위하여 픽업된 요소영상으로부터 서브영상을 재합성한 뒤, TSS 기반의 MSE 알고리즘을 사용하여 전 물체영역을 대상으로 가능한 물체영역 만을 고속으로 찾은 다음, 그 가능한 물체영역에 정밀한 FS 탐색 알고리즘을 적용하여 물체영상의 정확한 움직임 벡터를 추정하여 보상하게 된다. 또한, 움직임이 보상된 물체영상에 차 영상(difference image) 기법을 적용하여 서브영상 간의 공간적 중복 데이터를 제거한 잔여영상을 얻게 되고 이는 MPEG-4 알고리즘을 통해 최종적으로 압축되게 된다. 실험결과, 제안된 기법은 기존방식에 비해 영상 압축률은 그대로 유지하면서 프레임 당 압축시간이 214% 향상됨을 보임으로써 제안된 기법의 실제 응용 가능성을 제시하였다. In this paper, we propose a novel approach to effectively compress the sub-images transformed from the picked-up elemental images in integral imaging, in which motion vectors of the object in each sub-image are fast and accurately estimated and compensated by combined use of MSE(mean square error)-based TSS(tree-step search) and FS(full search) schemes. This is, the possible object areas in each sub-image are searched by using the fast TSS algorithm in advance, then the these selected object areas are fully searched with the accurate FS algorithm. Furthermore, the sub-images in which all object's motion vectors are compensated, are transformed into the residual images by using the difference image method and finally compressed with the MPEG-4 algorithm. Experimental results reveal that the proposed method shows 214% improvement in the compression time per each image frame compared to that of the conventional method while keeping the same compression ratio with the conventional method. These successful results confirm the feasibility of the proposed method in the practical application.
급속건조법(急速乾燥法)에 의한 은수원사시재(材)의 인공건조(人工乾燥)스케쥴 개발(開發)
이형우,Lee, Hyoung-Woo 한국목재공학회 1987 목재공학 Vol.15 No.2
A study was conducted to determine the kiln drying schedule for hydrid aspen, This kiln drying schedule was found by oven drying method and developed by pilot testing of 2.0cm, 2.5cm, 3.0cm-thick green lumber. The results of this study were as follows: 1. Kiln drying schedule developed by oven-drying method was $T_{12}-E_5$ for 2.5cm-thick green lumber. 2. Drying times for 2.0cm-thick green lumber(127.0 percent moisture content) to 7.3 percent moisture content, for 2.5cm-thick green lumber(95.0 percent moisture content) to 9.7 percent moisture content, and for 3.0cm-thick green lumber(118.5 percent moisture content) to 10.0 percent moisture content were 45 hours, 45 hours, and 54 hours, respectively. 3. Drying rate from 90 to 10 percent moisture content of 2.5cm-thick lumber was about 0.7 times faster than that of 2.0cm-thick lumber and about 1.1 times faster than that of 3.0em-thick lumber. 4. End checks for 2.0cm-, 2.5cm-, and 3.0cm-thick green lumber occurred 95, 74 and 100 percent moisture content, respectively and reached maximum amount in 53, 41, and 60 percent moisture content, respectively. 5. No surface check and no honeycomb occurred. 6. Cupping and collapse slightly occurred and the quality of dry lumber was first.
u-City의 노인복지주택계획에 있어서 적용 가능한 유비쿼터스 기술에 관한 기초 연구
이형우(Lee Hyoung-Woo),류재호(Lee Hyoung-Woo),김용성(Kim Yong-Seong) 대한건축학회 2009 대한건축학회논문집 Vol.25 No.4
This study tried to estimate potential of new ubiquitous technology in housing by observing its services and characteristics and looking into the characteristics of the state u-City that government is looking into. For the research, the researchers identified what the characteristics of senior housing are by analyzing some cases. We will analyze two subjects: the characteristics of home network facilities experimented by 'smart home industrialization support center' which is designated by the Ministry of Knowledge Economy and run by Kookmin University and of what services can be applied to u-City's senior residence. Based on those analyses and the results of the research, we'll plan a senior residence that has the characteristics of ubiquitous services. Through this study, we realize the fact that applying ubiquitous service to senior residence improves the efficiency of existing services offered by senior residence, boosting the safety and stability of the seniors' living.
미국 해안경비대원의 내재적 동기 만족에 영향을 미치는 요인: 국책 연구원과의 비교를 중심으로
이형우 ( Lee Hyoung Woo ),이동영 ( Rhee Dong Young ) 한국경찰학회 2017 한국경찰학회보 Vol.19 No.5
공공조직에 종사하는 공무원들은 외재적 보상보다 사명감, 성취감 등 내재적 요인에 의하여 더욱 동기부여 되는 것으로 알려져 있으므로 공무원들의 내재적 만족의 영향요인을 살펴보는 것은 공공조직 성과증진 측면에서 중요한 의미를 갖는다. 다양한 업무를 수행하는 공공조직 구성원들은 직무에 따라 다양한 내재적 만족의 영향요인을 가질 수 있는데, 특히 해안경비나 구조 등을 담당하는 해양경찰은 다른 공무원들과는 다른 내재적 동기만족 요인을 가질 수 있다. 이러한 맥락에서 본 연구에서는 미국 연방정부 내에서 서로 성격이 상이한 직무를 수행하는 해안경비대원과 국책연구원 연구원들을 대상으로 내재적 동기만족의 영향요인을 비교·분석하였다. 본 연구의 분석결과는 다음과 같다. 첫째, 상명하달의 관료제적 성격이 강한 해안경비대원의 경우 임무의 명확성이 내재적 동기에 가장 중요한 영향을 미치는 것으로 나타났다. 둘째, 비교적 자유롭고 혁신적인 사고를 중시하는 연구원의 경우 경력개발가능성이 내재적 동기만족에 가장 큰 영향을 미치는 것으로 밝혀졌다. 셋째, 성과주의 인사정책의 경우, 해안경비대원의 경우에는 내재적 만족을 저하시키는 요인으로 밝혀진 반면, 연구원의 경우 내재적 동기를 강화시키는 요인으로 나타났다. It has been frequently argued that employees in public organizations are strongly motivated by the factors internal to the work itself or to themselves (intrinsic motivation), rather than the external factors such as financial rewards. Thus, it is meaningful and important to investigate the antecedents and determinants of intrinsic motivation of public employees in order to inform managers in the public sector on how to improve the performance of their organizations. The intrinsic motivation of public employees can be influenced by numerous factors, and also, the relative significances of these factors can vary depending on the characteristics, culture, and environments of their organizations. Especially, police officers working for public safety and security will have quite distinctive mechanism through which they are motivated intrinsically. In this contexts, this study examine and compare the determinants of intrinsic motivation of public officials between the two distinctive organizations within the U.S. federal agencies, namely, the U. S. Coast Guard and National Research Center. The findings include, first, the intrinsic motivation of the employees in the Coast Guard were strongly influenced by the role clarity, since their organizations are characterized by strong bureaucratic culture and way of conducting tasks. Second, to the contrary, the intrinsic motivation of employees in the national research center tend to be strongly influenced by their career perspective, since their organizations are characterized by outstanding individual achievement through innovation. Third, as for the impact of performance management on intrinsic motivation, it increases the intrinsic motivation of the employees in the research center, while it decreases their intrinsic motivation of employees in the Coast Guard.