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Kibok Lee,Srdjan M. Lukic 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes an approach for implementing the restart for Synchronous Reluctance Machines (SynRMs) driving a high inertia load. The proposed method uses a simple identification algorithm to estimate the rotor speed and position of the machine so that the appropriate voltage vector can be applied to the machine, thus minimizing the inrush current at the instant of the restart. The novelty is that its implementation only requires nameplate machine parameters and a single DC-link current sensor. The proposed method is suitable for implementation with both high-inertia vector and scalar-controlled SynRMs.
사회과 교사 전문성으로서의 교수내용지식(PCK) 형성ㆍ강화와 교육대학원 교육과정
이기복(Kibok Lee) 한국사회과교육연구학회 2011 사회과교육 Vol.50 No.4
본 연구는 교육대학교 교육대학원 사회과 교육과정을 중심으로 사회과 교사의 현장적 요구를 충족하고 교과 전문성 신장을 위하여 현재 운영되고 있는 교육과정 구성 실제를 분석하여 사회과 교사 전문성으로서의 교수 내용 지식(Pedagogical Content Knowledge : PCK) 과의 관계를 파악하고, 사회과 교사전문성으로서 교수 내용 지식 형성과 신장을 위한 교육과정 개선이 급변하는 사회변화에 대한 효율적인 교육적 대응을 위한 중요한 방법 내지는 전략임과 동시에 교육대학원 개설 목적에 부합하는 교육과정으로의 접근을 위한 필수적인 조치임을 강조하고자 하였다. 현직 교사들에게 새로이 요구되는 전문성 신장ㆍ강화를 위해 교사교육 과정인 교육대학원 교육과정에서 필요한 것은 교사들에게 실천을 통한 반성적 사고를 할 수 있는 기회를 제공하는 일이며, 교육현장 중심의 교사 전문 지식을 확보할 수 있는 기회를 제공해 주어야 하기 때문이다. The purpose of this study is to search for the program of Expertise of the Social Studies Teacher base on the concept of Pedagogical Content Knowledge. The PCK was pursued in terms of the professionality of the Social Studies Teacher as interpretor or translator of domain-specific contents, topics, and ideas to learners with diverse characteristics. Main features of the Social Studies PCK are a personal knowledge domain featuring each teacher’s unique professionalism, synthetic in that it builds up separate knowledge domain into a connected whole, and experiential and practical knowledge that is situated in personal experience both inside and outside the classroom. For the intensification of Expertise of the Social Studies Teacher base on the Concept of PCK, we need the graduate school at the university of elementary teacher that would play a decisive role as the intensification and substitution system for the PCK as Expertise of the Social Studies Teacher. However, it is a pity that the present graduate schools have heavily focused on the promotion of scholastic abilities. therefor, the schools are in need of carrying out professional curriculum.
Performance evaluation of mask R-CNN for lung segmentation using computed tomographic images
Nam Kibok,Lee Dahye,Kang Seonghee,Lee Seungwan 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.4
Image segmentation techniques based on machine learning are able to improve diagnostic and therapeutic accuracy by localizing target areas. The accuracy and efciency of these techniques are dependent on network architecture and loss minimization method because the performance of a machine learning model is determined by training strategies. In this study, the lung segmentation based on computed tomographic images was performed by using mask regional convolutional neural networks (R-CNNs) with various feature extraction networks and optimizers. The efects of the feature extraction networks and optimizers on the trained mask R-CNNs were evaluated in terms of total training loss, segmentation accuracy and training time. The results showed that the convergence of total loss values during network training was afected by the architectures of the feature extraction networks as well as the optimizers. The lung segmentation accuracy and training time of the mask R-CNN were mainly dependent on the optimizer and network architecture, respectively. Among the various optimizers, the ASGD optimizer maximized lung segmentation accuracy, and the training time was reduced by the feature extraction network including general convolution layers and feature pyramid network (FPN). In conclusion, it is important to apply the optimal network architecture and optimizer to the mask R-CNN for maximizing its performance, and the optimized mask R-CNN can be potentially used for improving diagnostic and therapeutic accuracy.
s-IGDT 시스템의 X-선원 배열 형태 및 투영상 개수에 따른 영상 화질 평가에 관한 연구
이다혜(Dahye Lee),남기복(KiBok Nam),이승완(Seungwan Lee) 대한방사선과학회(구 대한방사선기술학회) 2022 방사선기술과학 Vol.45 No.2
Although stationary inverse-geometry digital tomosynthesis (s-IGDT) is able to reduce motion artifacts, image acquisition time and radiation dose, the image quality of the s-IGDT is degraded due to the truncations arisen in projections. Therefore, the effects of geometric and image acquisition conditions in the s-IGDT should be analyzed for improving the image quality and clinical applicability of the s-IGDT system. In this study, the s-IGDT images were obtained with the various X-ray source arrangement types and the various number of projections. The resolution and noise characteristics of the obtained s-IGDT images were evaluated, and the characteristics were compared with those of the conventional DT images. The s-IGDT system using linear X-ray source arrangement and 40 projections maximized the image characteristics of resolution and noise, and the corresponding system was superior to the conventional DT system in terms of image resolution. In conclusion, we expect that the s-IGDT system can be used for providing medical images in diagnosis.
Lee, Hansol,Nam, Kibok,Yang, Ji-Won,Han, Jong-In,Chang, Yong Keun Elsevier 2016 Algal research Vol.14 No.-
<P><B>Abstract</B></P> <P>Artificial sea salts were found to cause microalgal flocculation and was so rather effectively in the presence of extracellular polymeric substances (EPS). EPS-producing species <I>Ettlia</I> sp. YC001 formed flocs at relatively low salt concentration: at 3.5g/L, it reached up to 90% of the flocculation within 2h. EPS non-producer <I>Chlorella vulgaris</I> UTEX 265, on the other hand, was less responsive to the salts even at 7g/L and it had only 42% of floc formation. This phenomenon of salt-mediated flocculation appeared to be brought about mainly by calcium ion, as it has had greater affinity to the EPS than any other ions including the divalent magnesium ion. This sea salt-based coagulation may serve as one environmental-friendly alternative to commonly used chemical flocculants, which also potentially possess an economic merit.</P>
시내버스에서 변속 지시기 적용에 따른 실도로 연비 특성 분석
김기복(Kibok Kim),염시호(Siho Yum),박진일(Jinil Park),이종화(Jonghwa Lee),박경석(Kyoungseok Park),박준홍(Junhong Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
A shift pattern is a very important factor on a vehicle fuel economy. Especially for manual transmission vehicles, a fuel economy varies according to a driver’s tendency. If an indicator put a driver on notice of gear shift on pertinent point of time, the fuel economy can be improved. This paper focuses on fuel economy improvement through change of gear shifting engine speed and presents a gear shift algorithm considering a traction force, an APS, a vehicle acceleration and a BSFC(Brake Specific Fuel Consumption). Shift Indicate Algorithm considering a measure or calculate of engine speed, vehicle acceleration depend on APS, engine efficiency, traction force after gear shifted. Drivers can shift along embedded computer of applied shift algorithm. From simulation result of simulink and Cruse(AVL), we verify an algorithm. and parameter tuning from field test. The specification of test vehicle is 11000㏄ CNG engine, manual transmission. and the test condition is two cases, regular drive of bus company driver and drive depend on shift indicator. driving route is urban bus line of suwon city. Our team got a result from field test, 18% of vehicle fuel economy improvement can be achieved comparing to regular drive. that is because of higher engine efficiency, lower engine speed and lower acceleration.
가솔린 엔진 장착 차량에서 연속 가변 밸브 리프트 제어가 모드 연비에 미치는 영향
김기복(Kibok Kim),위효성(Hyoseong Wi),박진일(Jinil Park),이종화(Jonghwa Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
CVVL control system is the technology that adjusts engine load by changing valve lift continuously. It satisfies the load that driver demands by changing the amount of opening of the valve, while maintaining the intake pressure after the valve of atmospheric pressure. Because of CVVL control system, we can expect decrease pumping loss and engine mechanical friction, increase volumetric efficiency in all load and good fuel economy. In this study, perform engine test on no load condition and FTP-75 mode test. The specification of test vehicle is 1600cc gasoline engine. check the effect on CVVL which decrease engine mechanical friction and decrease pumping loss. As a result of engine test on no load, engine total friction is decrease 14.7%. portion of engine mechanical friction is 9.2% and pumping loss is 4.5% in engine total friction. As a result of FTP-75 mode test, fuel economy is 6.06% improvement. portion of engine mechanical friction is 2.66% and pumping loss is 1.82% in engine total friction. Also decrease engine mechanical friction and pumping loss in whole section of FTP-75 mode.