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홍준기 ( Joonki Hong ),문남미 ( Natnmee Moon ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.2
본 연구는 시각장애인들을 위한 대인관게 도움을 위하여,상대방의 성별과 나이를 안내하여 주는 시스템에 관한 것이다. 본 연구에서는 다시점 얼굴 인식 방법을 채택하여,인식장애 개선과 환경요인변화에 대처하여 성별과 나이구분,사람 수를 카운트 할 수 있도록 설계하였다. 모바일을 사용하여,시스템에서 측정한 상대방에 관한 정보를 미리 확인할 수 있어 원활한 대인관계를 갖을 수 있도록 하였다. 제안 시스템은 안드로이드 스마트폰과 연동하여 실험되어졌으며,C++, Open CV 및 Kmect SDK를 기 반으로 구현하였다.
연료전기 발전시스템에 Fly-Wheel 저장 시스템을 적용한 연구
홍현문(Hong Hyun-Mun),박가우(Park Ga-Woo),민준기(Min joonki),이진묵(Lee Jin-Mok),김수철(Kim Soo-Cheol) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
본 논문은 연료전지와 플라이윌 저장 시스템용을 결합한 복합 전원으로 하는 연료전지 발전 시스템의 전력변환장치 연구에 관한 것이다. 이를 위한 전력변환장치는 연료전지로부터 저전압을 상승시키기 고조파 DC-DC 컨버터, 이를 안정된 교류전원으로 변환하기 위한 DC-AC 인버터 및 플라이휠에 에너지 회생과 재생하기 위한 DC-AC 컨버터로 구성된다. 본 연구에서는 기존의 UPS 시스템은 AC 발전기 및 배터리를 백업 전원으로 사용하는데 많은 유해 물질을 발생시키지만, 이 시스템을 사용하면 환경오염, 높은 효율 및 대용량에 적합하다. 또한, 시뮬레이션을 통하여 연료전지 발전 시스템에 과부하시 안정하게 출력 성능을 가지도록 Fly-Wheel 시스템을 적용한 모의실험 결과를 제시한다.
민준기(Joonki Min),고유진(Yujin Ko),홍희기(Hiki Hong) 대한설비공학회 2019 설비공학 논문집 Vol.31 No.10
The purpose of this study was to conduct an energy performance evaluation using TRNSYS18 and test bed construction for the development of smart skin windows that can be controlled by solar radiation. For smart skin windows, clear glass (SHGC : 0.13 to 0.57) and low-e glass (SHGC : 0.06 to 0.25) according to the range of the Solar Heat Gain Coefficient (SHGC) were divided into 1.4 (W/㎡․K), 1.07 (W/㎡․K), and 0.7 (W/㎡․K), respectively. The results are as follow, compared to the standard. For U-Value 1.4 (W/㎡․K) when using clear glass, the cooling energy was -32.0% and the heating energy was 1.5%; when using low-e glass, the cooling energy was -37.0% and the heating energy was 64.4%. For U-Value 1.07 (W/㎡․K) when using clear glass, the cooling energy was -30.9%, and the heating energy was -8.5%; when using low-e glass, the cooling energy was -36.1%, and the heating energy was 45.6%. For U-Value 0.77 (W/㎡․K) when using clear glass, the cooling energy was -30%, and the heating energy was -27.8%; when using low-e glass, the cooling energy was -34.8%, and the heating energy was 20.1%. Thus, the results show that the cooling and heating energy is the most saved when using the clear glass at U-Value 0.77 (W/㎡․K).
A Novel SCMA System for Coexistence of Active Users and Inactive Users
Kim, Joonki,Lee, Kwonjong,Kim, Jintae,Wang, Hano,Na, Minsoo,Hong, Daesik IEEE 2017 IEEE COMMUNICATIONS LETTERS Vol.21 No.12
<P>This letter proposes a new sparse code multiple access (SCMA) system for handling the coexistence of active user equipments (UEs) and inactive UEs, which share the same frequency/time resources for an uplink grant-free scenario. SCMA systems use a message passing algorithm, which considers all UEs to be active UEs. Therefore, inactive UEs cause significant decoding problem in SCMA systems. In order to solve the coexistence problem, we propose code words and a novel SCMA receiver which can distinguish the signal of active/inactive UEs. The numerical results show that the proposed SCMA receiver achieves a remarkable enhancement in false alarm probability, miss detection probability, and bit-error rate.</P>
Analysis of Space Roundness with Converged Stereo Camera for Realistic 3D Content Production
Myungha Kim,Joonki Paik,Hyunki Hong 중앙대학교 영상콘텐츠융합연구소 2015 TechArt :Journal of Arts and Imaging Science Vol.2 No.1
It is necessary to match the viewpoint of the camera with user’s viewpoint during stereoscopic image production. In this matching process, distortion occurs as a result of optical errors. Accordingly, sweetening process is needed to reinterpret the geometric element of an image and minimize eyestrain. Particularly, the phenomenon of space roundness which occurs in converged image contents by the convergence method, causes eye-strain according to the viewing position. In addition, the paradoxical effects meaning the difference in spatial information caused by the combination of different depth information during CG/real 3D image synthesis can occur. This paper presents an effective method for 3D synthesis by understanding the cause of roundness in the process of synthesizing real stereo images with the convergence method and the CG object. The proposed method is applicabale for high-quality 3D stereoscopic images production by predicting and interpreting inconsistency in spatial structure relation between CG and real images.