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이호상(Hosang Lee),김광호(Kwangho Kim),윤진성(Jinsung Youn),이대희(Daehee Lee),황찬석(Chanseok Hwang),나완수(Wansoo Nah) 대한전기학회 2017 전기학회논문지 Vol.66 No.4
This paper proposes an analysis method of performance degradation of antenna due to radio frequency interference between an antenna and adjacent noise sources using active scattering parameters. The radio frequency interference can be analyzed by the measured or simulated scattering parameters and by excited noise sources in the circuit as well. In this paper, a planar inverted-F antenna and a noise source are designed and fabricated to analyze radio frequency interference between the planar inverted-F antenna and noise source. The proposed analysis method uses active scattering parameters, of which verification is experimentally verified, and in simulation as well.
Efficient Circuit and an EM Model of an Electrostatic Discharge Generator
Yousaf, Jawad,Park, Myeongkoo,Lee, Hosang,Youn, Jinsung,Lee, Daehee,Hwang, Chanseok,Nah, Wansoo [Institute of Electrical and Electronics Engineers 2018 IEEE transactions on electromagnetic compatibility Vol.60 No.4
<P>In this work, a new technique for an efficient, simple, and fast equivalent circuit and full wave numerical modeling of the electrostatic discharge (ESD) generator is presented. A novel circuit model of the NoiseKen ESD simulator is proposed based on the frequency domain measurement of the standard waveform calibration setup. The simple full wave electromagnetic model of the same generator, which requires much less computation resources, is also proposed using commercial CST Microwave Studio software. The reliability of the proposed models as an authentic ESD excitation source is validated through an example discharge application. The good agreement between the ESD reference waveform obtained through measurement, circuit model, and 3-D model of the generator is observed.</P>
이기종 무선 네트워크간 핸드오버를 위한 교차계층 최적화 방안
김학수(Hak soo KIM),김의연(Wee youn KIM),조재호(Jaeho Jo),조진성(Jinsung Cho) 한국정보과학회 2008 한국정보과학회 학술발표논문집 Vol.35 No.1
Mobile IP는 단말에게 이동성을 제공해 줌으로써 이동하면서도 인터넷에 접속할 수 있게 해준다. 하지만 L2 연결과 L3 연결이 순차적으로 진행되어 핸드오버시 지연과 데이터 로스의 문제가 발생한다. 이러한 핸드오버 과정에서 발생하는 지연과 데이터 로스를 줄이기 위해 L2 트리거를 이용한 Fast Handover 기술이 개발되었지만 Fast Handover 기술 역시 L2 연결과 L3 연결이 독립적으로 진행된다. 본 논문에서는 Mobile IP의 L3 핸드오버 과정과 이기종 네트워크들의 L2 핸드오버 과정을 통합하고 핸드오버 과정을 최적화하여 성능 개선된 핸드오버 방안을 제안하고 성능평가를 통해 우수함을 보인다.
함유근(Yukun Hahm),윤영수(Youngsoo Youn),강한수(Hansoo Kang),김진성(Jinsung Kim) 한국IT서비스학회 2012 한국IT서비스학회지 Vol.11 No.3
Cloud computing, which means a new way of deploying information technology(IT) in organizations as a service and charging per use, has a deep impact on organizations’ IT accessibility, agility and efficiency of its usage. More than that, the emergence of cloud computing surpasses a mere technological innovation, making business model innovation possible. We call this innovation realized by could computing a cloud business model. This study develops a comprehensive framework of business model, first, and then defines and analyzes the cloud business model through this framework. This study also examines the case of M-Pesa mobile payment as a cloud business model in which a new value creation and profit realization schemes have been realized and industry value network has changed. Finally, this study discusses the business implications from this new business model.
3D 프린팅 비압박 유방 팬텀 제작을 위한 복셀 기반 수치 모델에 관한 연구
윤한빈,백철하,전호상,김진성,남지호,이자영,이주혜,박달,김원택,기용간,김동현,원종훈,김호경,Youn, Hanbean,Baek, Cheol Ha,Jeon, Hosang,Kim, Jinsung,Nam, Jiho,Lee, Jayoung,Lee, Juhye,Park, Dahl,Kim, Wontaek,Ki, Yongkan,Kim, Donghyun,Won, Jong 대한의용생체공학회 2017 의공학회지 Vol.38 No.3
Physical breast phantoms would be useful for the development of a dedicated breast computed tomography (BCT) system and its optimization. While the conventional breast phantoms are available in compressed forms, which are appropriate for the mammography and digital tomosynthesis, however, the BCT requires phantoms in uncompressed forms. Although simple cylindrical plastic phantoms can be used for the development of the BCT system, they will not replace the roles of uncompressed phantoms describing breast anatomies for a better study of the BCT. In this study, we have designed a numerical voxel breast phantom accounting for the random nature of breast anatomies and applied it to the 3D printer to fabricate the uncompressed anthropomorphic breast phantom. The numerical voxel phantom mainly consists of the external skin and internal anatomies, including the ductal networks, the glandular tissues, the Cooper's ligaments, and the adipose tissues. The voxel phantom is then converted into a surface data in the STL file format by using the marching cube algorithm. Using the STL file, we obtain the skin and the glandular tissue from the 3D printer, and then assemble them. The uncompressed breast phantom is completed by filling the remaining space with oil, which mimics the adipose tissues. Since the breast phantom developed in this study is completely software-generated, we can create readily anthropomorphic phantoms accounting for diverse human breast anatomies.