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Thermometer Decoder를 SSCG에 적용한 저잡음 특성의 DC-DC Converter 설계
전상규(Sang Gyu Jeon),윤태영(Tae-Young Yoon),조종완(Jong Wan Jo),이강윤(Kang-Yoon Lee) 대한전자공학회 2019 대한전자공학회 학술대회 Vol.2019 No.6
In this paper I reduce harmonic, noise, crosstalk, and so on generated by DC-DC converter using Thermometer Decoder and Spread Spectrum Clock Generator (SSCG). The frequency was varied by using a variable capacitor and the maximum efficiency was 90.16%. The switching frequency was spread from 2MHz to 3MHz in the 2.5MHz band using SSCG.
전상규(Jeon Sang Gyu),송재종(Chai-Jong Song) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.6
본 논문에서는 최근에 다양한 분야에서 사용되고 있는 ToF 기술에 대해 살펴보고, 이를 활용한 3차원 스캐닝, 공간 인터랙션 기술에 대한 동향을 살펴본다. 특히, NUI를 위한 최적의 방법으로 생각되고 있는 제스쳐 및 공간 인터랙션에서 ToF 기술의 활용과 3차원 공간정보를 획득하여 지리 정보 및 공간 정보를 3차원으로 제공할 수 있는 3차원 맵핑 기술에 대해 살펴본다. 이를 바탕으로 향후 공간 인터랙션과 3차원 맵핑기술의 발전 방향을 가늠한다.
Chopper를 이용한 저잡음 2대역 Band Pass Filter 설계
전상규(Sang Gyu Jeon),조종완(Jong Wan Jo),김재빈(JaeBin Kim),이강윤(Kang-Yoon Lee) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.8
In this paper, various blocks and structures applied to the low-noise 2 band selection band pass filter are described. In the proposed Band Pass Filter, when the frequency is input through the buffer, one of Band 1 or Band 2 can be selected using the switch, and the output goes through the buffer after the selected switch among Band 1 and Band 2. After the pre-amplifier, the low frequency band pass filter is used to secure -3 ㏈ or more at 29.5 ㎑ (5 ㎑ range), and is used to secure -1 ㏈ or more at 39.5 ㎑ (5 ㎑ range). The aim is to remove the interference between bands by -20 ㏈ or more at the interference frequencies of 29.5 Hz and 39.5 ㎐, which are the center frequencies of each band. Chopper structure was used to reduce noise, and it was designed to drop more than -21㏈ / √㎐ in Band1,2.
전상규(Jeon, Sang-Gyu),노희철(Roh, Hui-Cheol),황재훈(Hwang, Jea-Hoon) 한국도시설계학회 2012 도시설계 : 한국도시설계학회지 Vol.13 No.4
본 연구는 보행 및 차량의 통행을 병행할 수 있는 가로공간에 관하여 위계별 중요도를 도출하고자 한다. 이를 위해 가로공간을 도로의 종류별 규모로 설정하여 가로공간의 구성요소를 선행연구와 관련문헌을 통해 도출하였다. 도출된 가로공간 구성요소를 바탕으로 전문가 설문조사를 실시하였다. 설문조사·결과는 다음과 같다. 첫째, 대로의 경우 이동 및 통과가 주 기능이므로 구성요소 역시 이동 및 통과와 관련되어진 요소에 맞춰 계획이 이루어져야 한다. 둘째, 중로의 경우 이동과 통과의 기능과 함께 체류의 성격도 있다. 따라서 도시민의 행태에 의한 문화적 특성요소, 이동과 통과, 상젓공간을 감안한 안전성에서 중요도가 높게 분석되었다. 셋째, 소로의 경우 공간을 이용하는 행태가 반영되어진 요소들로 중요도가 분석되었다. 또한 소로는 구조적 특성상 안전성을 중요시해야 한다. 따라서 본 연구의 결과를 바탕으로 도로의 위계별 접근을 통해 구성요소의 조성이 이뤄져야 가로공간의 질적 향상을 도모할 수 있다. This research draws the hierarchical weighting rate of the constituents of the street-space for both pedestrian and vehicle. For this purpose, a suggested types of the street-space was set up according to the scale and the component elements considering the advanced research and relative theory. The expert survey was performed based on the drawn street-space component elements. The survey result is as follows. First, in the case of the main road, since the circulation and traffic capacity are the main functions, the plan should be adjusted to the component related to the circulation and traffic. Second, in the case of the middle-size road, there is a tendency of the abiding by with all traffic issue. Therefore, the importance was highly estimated in the safety considering inconsistency space, cultural element, and circulation and traffic by behavior of the citizen. Third, in the case of the narrow path, the importance was on behavioral elements such as the use of the space. In addition, safety is issued by structural characteristic in the narrow path. The result of this research through the access of hierarchy of the road can assist the physical plan, which could enhance the quality of the street-space.
볼류트 형상이 원심 펌프의 성능에 미치는 영향에 대한 수치 해석적 연구
김덕수,전상규,윤준용,최영석,Kim, Deok-Su,Jeon, Sang-Gyu,Yoon, Joon-Yong,Choi, Young-Seok 한국유체기계학회 2006 한국유체기계학회 논문집 Vol.9 No.2
In this study, the effects of volute area distribution on the performance of a centrifugal pump were numerically studied using a commercial CFD code. To reduce the shutoff head, maintaining head and efficiency at a design flow rate, the flat head-capacity characteristic curves in which the head varies only slightly with capacity from shutoff to design capacity are frequently required. In order to control the shutoff head of a pump, several volute cross-sectional area distributions were proposed as a main parameter with the same impeller geometry The calculation results show that the slope of the performance characteristic curve of the centrifugal pump can be controlled by modifying the area distribution from volute tongue to volute outlet with fixed volute outlet area and also varied volute outlet area.
김진권(Jin-Kwon Kim),전상규(Sang-Gyu Jeon) 한국유체기계학회 2004 유체기계 연구개발 발표회 논문집 Vol.- No.-
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