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접촉식 면적변화형 정전용량 변위센서의 접촉 안정성을 위한 기구의 개발
김성주(Sungjoo Kim),이원구(Won-goo Lee),문원규(Wonkyu Moon) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.11
CLECDiS 는 면적변화형 정전용량 센서의 단점을 극복하고 나노미터 수준의 분해능으로 밀리미터 이상의 큰 변위를 측정하도록 개발된 접촉식 변위센서이다. 그러나 접촉구동 특성으로 인하여 표면평탄도와 마찰에 의해 작은 접촉상태의 변화에도 출력 신호는 크게 왜곡될 수 있어 실제 이를 활용하기 위해서는 전극간 접촉상태를 안정적으로 유지하는 것이 중요하다. 이에 본 연구에서는 전극간 접촉상태의 변화에 따른 신호의 왜곡 특성을 실제 출력 신호와 비교하여 분석하고, 접촉면 내 압력 분포와 센서의 운동 오차 측정을 통해 접촉상태의 변화를 파악하였다. 이를 통하여 센서의 운동 오차와 마찰력의 영향을 최소화하기 위한 접촉 유지 기구를 설계하고 제작하였으며 이를 이용한 구동실험을 통해 보다 안정적인 센서 출력 신호를 획득하였다. A contact-type area-varying capacitive displacement sensor, or CLECDiS, can measure displacements over millimeter ranges with nanometer resolution. However, a small changes in the contact condition due to the surface profile or friction, which are inherent characteristics of contact-type sensors, lead to significant distortion of the output signal. Therefore, ensuring reliable contact conditions during CLECDiS measurements is the most important area to be improved in their actual use. Herein, in order to design an instrument for ensuring reliable contact conditions, the contact condition is analyzed by characterizing the signal distortion, observing the pressure distribution between the contacting surfaces, and measuring the motional errors of the sensor using a laser Doppler vibrometer (LDV). The manufactured instrument enables a CLECDiS to be used in an ultraprecise positioning system with improved reliability
이아람 ( Aram Lee ),최경호 ( Kyungho Choi ),김해중 ( Hai-Joong Kim ),이정재 ( Jeong Jae Lee ),최규연 ( Gyuyeon Choi ),김성주 ( Sungjoo Kim ),김수영 ( Su Young Kim ),조금준 ( Geumjoon Cho ),김영돈 ( Youg Don Kim ),서은숙 ( Eunsook 한국산업보건학회 2018 한국산업보건학회지 Vol.28 No.3
Objectives: This study aims to analyze manganese (Mn) concentrations in maternal and cord bloods at delivery and to estimate the Mn exposure risk for fetuses whose mothers were occupationally exposed to Mn. Materials and Methods: Forty-six pairs of maternal and cord blood samples were collected at delivery from mothers who were occupationally unexposed to Mn. Mn concentrations of blood were analyzed by graphite furnace atomic absorption spectrometer. Mn exposure levels for fetuses of female workers were estimated by simulating two working exposure scenarios. Results: The geometric mean concentration of Mn in maternal and cord blood were 27.0(1.34) ㎍/L, 46.6(1.25) ㎍/L, respectively. Transfer ratios of Mn from maternal to cord blood were 1.81±0.62, which indicated that the Mn concentrations in cord blood were higher than those in maternal blood. Mn concentrations in cord blood for the worse or general scenarios were estimated to 22.3-1,881 ㎍/L and 1.59-308 ㎍/L, respectively. The probabilities of exceeding 74 ㎍/L, which was adopted as a reference level reported in a previous study, were 95% and 44% for the two scenarios, respectively. Conclusions: Comparable levels of Mn exposure in maternal or cord blood to those in this study have shown various health effects in previous studies. This suggests that Mn exposure levels in mothers and fetuese in Korea need to be monitored and managed. In addition, female workers who are occupationally exposed to Mn should be protected from the exposure since their fetuses can be exposed to Mn at risky levels during their pregnancy.
이동식 야전부품지원(MPH) 에서의 e-manufacturing 을 위한 형상파트진단
김명규(Myungkyu Kim),김성주(Sungjoo Kim),지해성(Haeseong Jee) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
MPH(Mobile Parts Hospital) develop a capability to produce replacement parts for equipment in the field at or near the point-of-need. This capability will enable the rapid repair and return to service of disabled equipment and address the military priority of weapon system readiness. If the event data for a part is not available or a communications failure, it is capable of gathering its own geometric data through the use of a 3-D laser scanning system. Some unknown geometric defects and irregular geometric features on an STL model, however, can possibly turn out to be wrong metal part fabrication after build. This study proposes methodical approach for verifying build part by defining some irregular features possibly existing on the part. The method has been verified using implementations and visually simulated for the application.
지방보조금 관리체계 개선방안에 관한 연구: 지방보조금심의위원회의 역할 강화방안을 중심으로
윤태섭 ( Taeseop Yoon ),김성주 ( Sungjoo Kim ) 중앙대학교 국가정책연구소 2020 국가정책연구 Vol.34 No.2
최근 지방재정의 방향은 재정분권의 강화, 자율성 확대, 지역적합형 사업 발굴 및 추진이며, 이러한 방향은 지역의 특수성과 주민의 눈높이를 반영하는 재정정책 수단인 지방보조금의 증가를 가져오고 있다. 이에 본 연구는 지방보조금심의워원회의 심의에 있어 수 많은 지방보조금이 모든 단계의 절차를 밟는 등 일률적 심의에 따른 비효율성을 개선하여 궁극적으로는 지방보조금의 관리 및 심의의 효율성을 높이는 개선방안을 도출하고자 하였다. 이를 위해 지방보조금 통계목을 성격별로 유형화 하여 그 유형별로 심의절차를 차별화 하는 등 방안을 제시하였다. 또한 국도시비보조사업에 대한 심의의 제외 필요성을 제시하였다. 국도시비보조사업의 경우 해당 사업에 대한 집행기능만을 담당하는 자치단체 입장에서 심의의 실효성이 없을 뿐 아니라 지방보조금심의위원회의 심의 부담만을 가중시키고 있기 때문이다. 이밖에 공공단체보조 신규사업과 계속사업의 심의절차 및 관리체계의 차별화, 통계목별 차별적 심의를 제시하였다. This study seeks to the improvement plans to management system of local grants focusing on enforcement plans of local grant review committee. Recent, with respect to expanding local autonomy, government has pushed forward to financial decentralization. In hence, local grants management system is also modified such as abolition to limited amounts by departments and exemption to local grants with employment. Therefore, this study is to suggest improvement plans to local grant review committee focusing on types and characteristics of local grants. For doing so, this study is to suggest improvements with respect to changes in law and manual and management process of local governments regarding types and characteristics of local grants. Especially, with regard to management and performance evaluation systems, it seeks to classification plans to local grants.
국고보조금의 비효율성에 관한 연구 - 부정수급・유사중복을 중심으로 -
서정섭(Jeongseop Seo),김성주(Sungjoo Kim),윤태섭(Taeseop Yoon) 한국지방행정학회 2018 한국지방행정학보 (KLAR) Vol.15 No.1
Government subsidies are the financial mean for correcting economic side-effects, realizing government policies, and improving resident welfare. However, government subsidies also generate inefficiencies in implementation process. Theoretically, government subsidies could make inefficiencies by incurring moral hazard and information asymmetry in the process of implementation. With regard to these inefficiencies, government promotes reform to government subsidies. Especially, government focuses on the reforms with respect to duplication, similarity, compliance failure, and unreasonable implementation. Therefore, this study is to analyze factors affecting inefficiencies focusing on compliance failure, duplication, and similarity. The results show that the complexity of implementation process, the absence of monitoring system, nda the insufficiency of post management system of government subsidies could incur inefficiencies.