고출력 LED 패키지의 Thermal Via 형성을 위한 Si 기판의 이방성 습식식각 공정

유병규,김민영,오태성,Yu, B.K.,Kim, M.Y.,Oh, T.S. 한국마이크로전자및패키징학회 2012 마이크로전자 및 패키징학회지 Vol.19 No.4

In order to fabricate through-Si-vias for thermal vias by using wet etching process, anisotropic etching behavior of Si substrate was investigated as functions of concentration and temperature of TMAH solution in this study. The etching rate of 5 wt%, 10 wt%, and 25 wt% TMAH solutions, of which temperature was maintained at $80^{\circ}C$, was $0.76{\mu}m/min$, $0.75{\mu}m/min$, and $0.30{\mu}m/min$, respectively. With changing the temperature of 10 wt% TMAH solution to $20^{\circ}C$ and $50^{\circ}C$, the etching rate was reduced to $0.067{\mu}m/min$ and $0.233{\mu}m/min$, respectively. Through-Si-vias of $500{\mu}m$-depth could be fabricated by etching a Si substrate for 5 hours in 10 wt% TMAH solution at $80^{\circ}C$ after forming same via-pattern on each side of the Si substrate. 습식공정으로 thermal via용 SI 관통 via를 형성하기 위해 TMAH 용액의 농도와 온도에 따른 Si 기판의 이방성 습식식각 거동을 분석하였다. TMAH 용액의 온도를 $80^{\circ}C$로 유지한 경우, 5 wt%, 10 wt% 및 25 wt% 농도의 TMAH 용액은 각기 $0.76{\mu}m/min$, $0.75{\mu}m/min$ 및 $0.30{\mu}m/min$의 Si 식각속도를 나타내었다. 10 wt% TMAH 용액의 온도를 $20^{\circ}C$와 $50^{\circ}C$로 유지시에는 각기 $0.07{\mu}m/min$와 $0.23{\mu}m/min$으로 식각속도가 저하하였다. Si 기판의 양면에 동일한 형태의 식각 패턴을 형성하여 $80^{\circ}C$의 10 wt% TMAH 용액에 장입하고 5시간 식각하여 깊이 $500{\mu}m$의 관통 via hole을 형성하였다.

경직형 양하지 뇌성마비아동의 시지각 능력과 일상생활동작과의 관련성 연구

유병규,정금희,Yu, Byong-Kyu,Jung, Kum-Hee 대한감각통합치료학회 2006 대한감각통합치료학회지 Vol.4 No.1

Objective : The purpose of this study was to evaluate the correlation between visual perception ability and activities of daily living(ADL) in the children with spastic diplegia who were treated at developmental disabilities children salutary institute. Method : The subject were consisted of 8 children with spastic diplegia(mean age, 10). The visual perception ability was measured by the Developmental Test of Visual Perception(DTVP) and by the Functional Independence Measure for Children(WeeFIM) to evaluate activities of daily living. Collected data analysis were completed by using correlation analysis. Results : Visual perception ability of children with spastic diplegia is the highest in Position in Space(PS) score, and is the lowest in Visual-Motor coordination(VM) score. Average visual perception performance of children with spastic diplegia is the highest in SR(Spatial relationship) score, and is the lowest in VM score. In activities of daily living, eating component were significantly correlated with Visual-Motor coordination. Conclusions : Therefore, accurate evaluation of visual perception ability and visual perception training for children with spastic diplegia will be important to improve patient's activities of daily living skill.

흰쥐 해마의 치상회에서 압박자극 적용이 뇌 신경세포 증식에 미치는 영향

유병규,김경미,김창주,Yu, Byong-Kyu,Kim, Kyeong-Mi,Kim, Chang-Ju 대한감각통합치료학회 2004 대한감각통합치료학회지 Vol.2 No.1

Objective : Effect of treadmill exercise on hippocampal neural cell proliferation under normal conditions and alcohol intoxication conditions has been recently studied; however, this effect under sensory stimulation application has not clarified yet. In the present study, the effect of compression stimulation application on hippocampal neural cell proliferation in the dentate gyrus in normal and alcohol intoxicated rats was investigated. Methods : Experimental design: comparative investigation on number of 5-Bromo-2'-deoxyuridine(BrdU)B-positive cells in dentate gyrus 5 days after commencement. Setting: animal laboratory. Participants: male Sprague-Dawley rats of 3weeks old in age weighing $80{\pm}10gm$. Intervention: animals were randomly assigned into 4 groups; control-rest group(n=8), control-compression group(n=8), alcohol intoxication-rest group(n=8) and alcohol intoxication-compression group(n=8). Animals of the alcohol intoxicated groups were injected intraperitoneally with alcohol(2g/kg) twice per day for 3 days. All animals were injected BrdU(50mg/kg) intraperitoneally, and rats compression stimulation application groups were compressed using sphygmomanometer cuff times per day, for 5 days following alcohol administration. Measures: mean number of BrdU-positive cells in dentate gyrus was observed via immunohistochemistry. Results : Compression stimulation application significantly increased the number of BrdU-positive cells in the dentate gyrus. Also, treatment with alcohol for 3 days inhibited cell proliferation, and compression stimulation application alleviated alcohol-induced inhibition of new cell formation. Conclusion : These results suggest the possibility that compression stimulation application may help in improvement following alcohol-induced brain damaged.

동결견 환자에 대한 키네시오 테이프 적용이 관절가동범위 및 통증에 미치는 영향

유병규,오경환,이재갑,Yu, Byong-Kyu,Oh, Kyung-Hwan,Lee, Jae-Gab 대한물리치료과학회 2001 대한물리치료과학회지 Vol.8 No.1

This study was performed to assess the efficacy of Kinesiotape for the frozen shoulder patients. The subjects of this study were 17 patients with frozen shoulder who visited the out-patient department of the physical therapy, Pyongchon Sacret Heart Hospital, Hallim University, from July. 3, 2000 through August 12, 2000. To find out the effect of kinesiotape therapy, we sampled 8 patients treated with electrotherapy and therapeutic exercise (control group), and 9 patients treated with electrotherapy and therapeutic exercise with kinesiotape(experimental group). All patients were treated 3 days a week for 5 weeks. The results after 5-week treatment, compared with before treatment, were as follows: 1. The increase in range of motion in the electrotherapy and therapeutic exercise with kinesiotape after 5-week treatment was very significant(p<0.01). 2 The increase in range of motion in the electrotherapy and therapeutic exercise after 5-week treatment was significant (p<0.05). 3. The pain of decrease in the electrotherapy and therapeutic exercise with kinesiotape after 5-week treatment was very significant (p<0.01). 4. The pain of decrease in the electrotherapy and therapeutic exercise with kinesiotape 5-week treatment was significant(p<0.05). 5. The electrotherapy and therapeutic exercise with kinesiotape was more effective in increasing the range of motion on shoulder than the electrotherapy and therapeutic exercise after 5-week treatment(p<0.01). 6. The pain of decrease in between electrotherapy. therapeutic exercise with kinesiotape electrotherapy and therapeutic exercise after 5-week treatment was no significant.

색과 음악 빠르기 자극이 정상 아동의 정적 균형에 미치는 영향

유병규,김경,황재수,Yu, Byong-Kyu,Kim, Kyung,Hwang, Jae-Su 대한감각통합치료학회 2005 대한감각통합치료학회지 Vol.3 No.1

Objective : The purpose of this study was to investigate the effect of sensory stimulation for static balance on normal children. Sensory input was consisted of colors, and music tempo stimulation. Methods : Participants were consisted of 20 normal kindergarten children ranging in age from six to seven years. The static balance was tested by a BPM(Balance Performance Monitor). In this study one-way ANOVA was used and the statistical significance level of results was determined at 0.05. Results : 1. According to color stimulation, there was no significant difference in static balance among red, yellow, green(p>0.05). 2. According to music tempo stimulation, there was no significant difference in static balance, among the high music tempo and low music tempo children in a general environment(p>0.05). 3. However, both green color and low music tempo stimulation have a little effect on static balance on normal children. Conclusion : These results indicate the possibility that the application method of green color and low music tempo stimulation may help in the improvement of static balance for the disabled children. This study will be used as the foundational data of therapeutic environment for the disabled children.

지자체지원형 해외농업개발사업의 전개방향

유병규(Byung Gyu Yu) 한국농촌사회학회 2001 農村社會 Vol.11 No.1

1960년대부터 시작된 우리 나라의 해외농업개발사업은 1980년대 이후 국가주도의 농장개발형에서 민간주도의 개발수입형으로 바뀌게 된다. 경상북도에 의해 처음 실시된 지자체지원형 해외농업개발사업은 축산사료의 개발수입이 목적이었지만, 여러 가지 사정으로 인하여 지역출신 농기업체에게 자금을 지원하는 형태로 전개되었다. 이 연구는 이러한 지자체지원형 해외농업개발사업의 문제점을 파악하고, 이 사업과 관련하여 지자체가 나아가야 할 방향을 모색하는데 목적을 두었다. 지자체에 의한 해외농업개발사업의 내용으로는 농기업에 대해 융자지원을 통해 사업비를 지원하거나 현지 합작을 유도하는 방법, 그리고 생산물의 가공공정을 거친 후 수입하는 방법이 있을 수 있다. 그러나 지자체가 이 사업을 위해서는 무엇보다 정책적 목표 달성을 위한 정밀한 점검, 철저한 사전조사, 지자체간 협조채널 구축 등이 필요하다. 그리고 생산 분야와 더불어 가공, 유통, 자재산업, 종자생산 등 다양한 분야에 대해 단계적으로 그리고 시범적으로 추진하는 것이 바람직할 것으로 보인다. In the 1960s Korea started to form an appropriate pattern of the overseas agricultural development project through the timely immigration policy under the given circumstances. However, in the 1980s, the project began to be transformed from state-led farm development into the type of private-initiated development import. Even though the local government-supported overseas agricultural development project was carried out initially in Kyungsangbukdo to secure feed grains, it focuses on providing funds for agricultural firms, due to reasons combined. This study aims to analyze the problem of the local government-supported overseas agricultural development project. Further its object is to explore the correct direction of the role of local government in relation to the project. This study concludes that the successful performance of the local government-supported overseas agricultural development project demands the goal achievement strategy based upon a close examination and cooperative system of participants involved. It is also important to extend project areas from agricultural production to processing, marketing, seed distribution, and other agricultural material production industries, by stages.

건물용 태양광 컨버터의 최대전력 추종 기법 개발

유병규(Yu Byung-Gyu),유권종(Yu Gwon-Jong) 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.4

This paper proposes a novel sensorless maximum power point tracking (MPPT) algorithm for PV systems. The method is based on dividing the operating time into several intervals in which the PV terminals are short circuited in one interval and the calculated short-current of the PV is obtained and used to determine the optimum operating point where the maximum output power can be obtained. The proposed MPPT algorithm has been introduced into a current-controlled boost converter whose duty ratio is controlled to the maintain MPP condition. The same sequence is then repeated regularly capturing the PV maximum power. The main advantage of this method is eliminating the current sensor. Meanwhile, this MPPT algorithm reduces the power oscillations around the peak power point which occurs with perturbation and observation algorithms. In addition, the total cost will decrease by removing the current sensor from the PV side. Finally, simulation results confirm the accuracy of the proposed method.

심포지엄 『디지털경제 발전과 법제개정 방향』에 대한 指定討論 要旨

兪炳圭(Byung-Gyu Yu) 한국법학원 2000 저스티스 Vol.33 No.2

슬립모드 주파수변이 방식의 단독운전 검출법의 분석과 모델링

유병규(Byung-Gyu Yu),정영석(Young-Seok Jung),소정훈(Jung-Hun So),유권종(Gwon-Jong Yu) 대한전기학회 2005 대한전기학회 학술대회 논문집 Vol.2005 No.7

역률개선을 위해 경계전류모드로 동작하는 브리지리스 부스트 컨버터

유병규(Byung-Gyu Yu),이성세(Sung-Se Lee),한상규(Sang-Kyu Han),문건우(Gun-Woo Moon) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.11

Recently, many nations have released standard such as IEC 1000-3-2 and IEEE 519 which Impose a limit on the harmonic current drawn by equipment connected to AC line in order to prevent the distortion of an AC line.<br/> Among the wide variety of active methods for improving power factor and harmonic distortion, the boost converter is very effective because It has a continuous line current, small choke filter and high power factor. In high power application, however, the bridge diode loss 10 the boost converter has made the efficiency lower and the temperature of the board higher. A new approach without bridge d10de to make the same characteristics of the conventional boost converter has also been developed This paper present the comparisons between the continuous current mode(CCM) operated conventional boost converter and the boundary current mode(BCM) operated the bridgeless boost converter for high efficiency and high power factor