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Choi, GyeongSeop,Mohamed, M.G.A.,Kim, HyungWon IEEE 2016 Journal of display technology Vol.12 No.11
<P>As touch screens become larger, touch screen sensing techniques are facing growing demands for higher resolution and speed. While a fast touch screen sensing technique, frequency division concurrent sensing (FDCS) can provide substantial speed enhancement, its scan speed is still limited by the frequency characteristics of the touch screen and driving signals. We propose an enhanced FDCS technique to further improve the scan rate up to four times. The proposed technique drives only the first half-period of driving signals, while reconstructing the remaining half of the signals at the new fast Fourier transform (FFT) called a reconstruction FFT. This way, we can double the scan rate of the FDCS's maximum rate. In addition, we introduce a differential driving technique, which halves the number of required frequencies. This consequently allows us to increase the driving signal frequencies by two times. We also introduce a frequency shuffling technique to eliminate the multitouch cancellation problem, a common problem that makes it difficult to use differential signals for multitouch detection. Simulation experiments show that the proposed method can achieve four times higher scan rate at the cost of little overhead and SNR loss.</P>
프로세스 중심 소프트웨어공학 환경의 구성요소간 인터페이스 설계에 관한 연구
최상일,이형원 국립7개대학공동논문집간행위원회 2002 공업기술연구 Vol.2 No.-
In order to produce a high-quality software product on planned time, all the software development processes should be effectively managed. Process-centered software engineering environments(PCSEEs) are software engineering environments in which software processes are explicitly defined, modeled and enacted. In this paper, we defined interfaces between components of PCSEEs such as process engine, resource manager and agent manager. These interfaces are major building blocks for PCSEEs, so they can be applied to implement a variety of PCSEEs. Also, we simulated the interfaces with a rule-based language CLiPS.
최재화(Jaehwa Choi),공혜란(Hyeran Kong),박형원(HyungWon Park),배중호(Jungho Bae),이광범(Gwangbeom Lee),권해붕(Haebung Gwon) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Energy consumption of electric vehicle is mainly affected by ambient temperature. While a few electric vehicles is driven in a public institution, a decrease in driving range and a increase in charging time are raised as issues in winter. This study evaluate energy consumption on the basis of vehicle road test in variation of ambient temperature. And we presume driving range in effective using area of battery. Also charging characteristics is researched by in valid of ambient temperature.
최준식 ( Joonsik Choi ),윤수현 ( Suhyeon Yoon ),고혜인 ( Hyein Ko ),권구환 ( Guhwan Kwon ),정예락 ( Yerak Jeong ),이형원 ( Hyungwon Lee ) 한국정보처리학회 2020 한국정보처리학회 학술대회논문집 Vol.27 No.2
현재 식품의약품안전처에서 공공데이터 포털에 제공하는 정보에 의하면 국내에는 20,000종 이상의 약이 유통되고 있다. 식약처와 여러 제약회사에서 기본적인 약 정보를 제공하고는 있지만 정확한 처방전이나 설명서가 없는 경우에 무분별한 약 복용의 위험성을 안고 있다. 일부 약 검색을 지원하는 사이트가 있으나 세부 사항을 사용자가 일일이 선택하고 입력해야 정확한 정보를 얻을 수 있다. 본 논문에서는 사용자의 스마트폰을 이용하여 알약을 촬영하면 해당 약을 인식하고 상세 정보를 알려주는 딥러닝 모델을 설계하였다. CNN 신경망을 사용하여 약의 모양, 색상, 마크, 분할선 등을 기준으로 분류하고 인식된 약의 세부 정보는 공공데이터로부터 받아온다.
Self-semi-supervised clustering for large scale data with massive null group
Soo Hyun Ahn,Hyungwon Choi,임요한,이경은 한국통계학회 2020 Journal of the Korean Statistical Society Vol.49 No.1
In this paper, we propose self-semi-supervised clustering, a new clustering method for large scale data with a massive null group. Self-semi-supervised clustering is a twostage procedure: preselect a part of “null” group from the data in the first stage and apply semi-supervised clustering to the rest of the data in the second stage, allowing them to be assigned to the null group. We evaluate the performance of the proposed method using a simulation study and demonstrate the method in the analysis of time course gene expression data from a longitudinal study of Influenza A virus infection.
윤영한(Younghan Youn),박형원(Hyungwon Park),이재완(Jaewan Lee),윤경환(Kyunghan Yoon),최영태(Yongtae Choi) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2
In this study, a senes of sled test was conducted tests to evaluate the child safety performance with various CRS and adult seat belts according to FMVSS 213. Currently, CRS test is required both domestic and imported products. Test results show that the injury reducing effect of CRS is higher than that of adult seat belt. In order to achieve the best protections i the event of the crash, children need suitable restraint system for their size and age.<br/> Nevertheless, in the recent survey, it shows that the usage rate of CRS is very low(19.4%) in 4 major cities of this country. <br/> The problem associated with protection of child occupant is that the usage rate of CRS is very low. Therefore, it needs a significant effort to promote increasing the usage rate of CRS through various activities, such as, campaign for restraint use, modification of the requirement for safety performance, the promotion of a nationwide infant seat rent program.<br/>
Sung Soyoung,Kang Hee Jin,Shim Hyungwon,Shin Kyung-Hun,Choi Jang-Young 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.6
Field-oriented control of permanent magnet synchronous machines, used in high-precision control applications, suff ers from signifi cant problems due to the delay eff ect of the fi lter. To address these problems, this study focuses on the analysis, design, and realization of various analog and digital fi lters. Based on the analysis results, it is mathematically demonstrated that the output signal of the fi lter shows diff erent delay times; moreover, the delay times and magnitudes for each fi lter are obtained. This paper also proposes a delay time compensation technique for various fi lters, focusing on fi lters used in the current feedback system of high-speed controls. The results were verifi ed through simulations and experiments. The presented analysis and experimental results show that the delay time compensation technique proposed in this paper is eff ective for several types of fi lters used in the control systems of electrical machines. The proposed method in this paper facilitates the use of any type of fi lter in motor/generator control systems with the DT compensation.
고에너지 빔 분포 형상을 고려한 폭약의 2-D 가열과 점화 연구
이경철(Kyung-cheol Lee),최윤수(Yoonsoo Choi),김형원(Hyungwon Kim),최정열(Jeong-Yeol Choi),여재익(Jai-ick Yoh) 한국추진공학회 2008 한국추진공학회 학술대회논문집 Vol.2008 No.11
레이저는 다양한 빔 에너지의 분포 형상을 가질 수 있으며 크게 정형화된 분포 형상은 모드로 구분하여 모드에 따른 빔 에너지 분포 형상은 예측이 가능하다. 본 연구에서는 고에너지의 빔 분포 형상에 따른 steel의 가열 모델을 제시하고 빔 분포 형상에 따른 가열 패턴의 예측과 비교를 수행하였으며, 가열 패턴이 폭약의 점화에 미치는 영향에 대해 논의 하였다. Various types of beam distributions of high energy lasers are classified by the mode patterns. We study two dimensional laser initiation of confined energetic materials with multiple beam profiles.