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RISS 인기검색어
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- 저자 : 강진규 (검색결과 451 건)
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Single-Inductor Multiple-Output DC-DC Converter with Comparator-Based Feedback Circuit
강진규,유창식 한국과학기술원 반도체설계교육센터 2017 IDEC Journal of Integrated Circuits and Systems Vol.3 No.1
In this paper, a single-inductor multiple-output (SIMO) DC-DC converter with comparator based feedback circuit is proposed. The proposed SIMO converter does not need feedback loop which is composed of error amplifier or OTA and its compensation network. Therefore, tolerance of the feedback loop is improved since it does not suffer the variation of compensation resistor and capacitor. Also, variation of loop characteristic arises from external inductor value, capacitor value and load current can be removed. The measured peak power conversion efficiency is 81% when the output power is 140mW.
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A 40-W Flyback Converter with Dual-Operation Modes for Improved Light Load Efficiency
강진규,박정표,공정철,유창식 대한전자공학회 2015 Journal of semiconductor technology and science Vol.15 No.4
A flyback converter operates with either pulse width modulation (PWM) or pulse frequency modulation (PFM) control scheme depending on the load current. At light load condition, PFM control is employed to reduce the switching frequency and thereby minimize the switching power loss. For heavier load, PWM control is used to regulate the output voltage of the flyback converter. The flyback controller has been implemented in a 0.35 μm BCDMOS process and applied to a 40-W flyback converter. The light-load power efficiency of the flyback converter is improved up to 5.7-% comparing with the one operating with a fixed switching frequency.
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강진규,유지원,김성택,최종훈,Kang, Jin-Kyu,Ryu, Ji-Won,Kim, Seong-Taek,Choi, Jong-Hoon 대한안면통증구강내과학회 2006 Journal of Oral Medicine and Pain Vol.31 No.4
Headache is a common disease which influences not only individually but also socially. Temporomandibular disorders(TMD) refers to pain and dysfunction within the temporomandibular joint(TMJ) and associated muscles. TMD is presented commonly, and 70% of population are found to have one or more related symptom. A number of studies have been conducted to verify the association between headache and TMD, and some authors have proposed that headache and TMD may be related. In this study, we studied the patterns of headache presented by the patients who visited the TMJ and Orofacial pain clinic. Among the patients participated in this study, tension type headache showed the highest prevalence(48.5%), followed by migraine without aura(15.0%), probable migraine(10.6%), migraine with aura(7.1%), probable tension type headache(4.8%), and other primary headaches(1.8%). The high prevalence of tension type headache may be due to the accompaniment of orofacial pain by pericranial muscle tenderness. Comparison of sex showed that the rate of migraine was higher in female than male(female to male ratio 35.8:25.3). In age analysis, the rate of migraine was high in the twenties(42.2%) and the thirties(40.0%). As the age increased, the rate of migraine decreased, and this trend was in accordance with the previous studies. The percentage of the patients who had previously received treatment was only 26.2%, and that of those who were aware of the diagnosis was merely 8.7%. Therefore, it is not common for headache patients to get treatment, however, since orofacial pain is often accompanied by headache, more systematic diagnosis as well as precise treatment would be necessary. Moreover, since TMD could induce and aggravate headache, proper evaluation and management of TMD would be essential for diagnosis and treatment of headache. In the future, more systematic and broad investigation on the influence of causative factors of TMD on headache as well as the change in headache pattern with the treatment of TMD would be required.
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강진규 한국방송·미디어공학회 2021 방송과 미디어 Vol.26 No.1
최근 3D 그래픽스 기술과 관련된 기기들의 비약적 발전을 통해 가상, 증강, 확장 현실이라는 기존의 현실 세계에 새로운 정보를 더하는 연구가 활발하게 진행되고 있다. 우선 앱 기반의 가상, 증강, 확장 현실을 구현하는 과정에서 기기별 또는 브라우저별, OS별로 개발 환경이 다름으로 인한 개발비용이 상승하는 등의 애로사항들이 있었고, 이로 인해 Web 환경에서의 가상, 증강, 확장 현실을 구현하기 위한 표준형 통합 플랫폼의 필요성이 대두하였다. OpenXR, WebXR이 가상 증강현실에서의 새로운 표준을 제시하고 기술을 공개하여, 하드웨어와 소프트웨어 산업 모두에서 좋은 호응을 얻기 시작하였다. 따라서 본고에서는 가상 증강현실에서의 OpenXR과 WebXR 표준에 대한 정의 및 기술에 대하여 살펴보고, 가상 증강 환경에서의 기술 동향과 발전방향에 대하여 살펴보고자 한다.
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강진규,김세윤,안광석,김삼미,손대호,김승현,양기정,성시준,황대규,김대환 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
현재 전 세계 태양광 시장은 100GW 규모로, 조만간 TW급 규모의 시장이 형성될 것으로 예측되고 있다. TW급 시장에서는 범용, 저가 재료를 사용한 친환경 태양전지의 실현이 매우 중요하다. 플렉시블 태양전지는 곡면에 대응할 수 있고 가볍다는 장점과 R/R 공정에 적용하여 저가화를 실현할 수 있다는 점 때문에 많은 연구가 진행되고 있다. 본 연구에서는 Mo나 SUS 메탈 기판을 이용하여 플렉시블 태양전지를 구현하였고, 플렉시블 기판 위에서 CZTSSe 태양전지를 최적화하여 세계 최고 광전 변환 효율을 실현하였다. <sup>**</sup>This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20173010012980), and the DGIST R & D Programs of the Ministry of Science, ICT & Future Planning of Korea (19-BD-05).
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