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An Improved Single Switched Post Regulator for Multiple Output Isolated Converters
Sang-Gab Park,Seung-Hee Ryu,Kwang-Seung Cho,Byoung-Kuk Lee 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper presents a new high accurate single switched post regulator with voltage-doubler characteristic. The proposed post-regulator requires only one auxiliary switch compared to the bulky and expensive non-isolated DC/DC converter. Moreover, the added voltage-doubler can tightly regulate the slave output current. In addition, the proposed post-regulator can improve EMI characteristics and reduce switching losses due to the ZCS operation of all power switches. Finally, in order to verify the validity of the proposed converter, experimental results from a prototype applicable to the 48” LED 3D TV power supply are presented.
Control of Powdery and Downy Mildews of Cucumber by Using Cooking Oils and Yolk Mixture
Jee, Hyeong-Jin,Shim, Chang-Ki,Ryu, Kyung-Yul,Park, Jong-Ho,Lee, Byung-Mo,Choi, Du-Hoe,Ryu, Gab-Hee The Korean Society of Plant Pathology 2009 Plant Pathology Journal Vol.25 No.3
Powdery and downy mildews caused by Sphaerotheca fusca and Pseudoperonospora cubensis are the most common and serious diseases of cucumber worldwide. In spite of the introduction of highly effective systemic fungicides, control of these diseases remains elusive. Hence, this study aimed to develop an alternative method to chemicals in controlling the diseases by using different types of cooking oil. Egg yolk, which contains a natural emulsifier, lecithin, was selected as a surfactant to emulsify the oils. Among the different cooking oils used, soybean, canola (rape seed), safflower, sunflower, olive, and corn oils showed over 95% control values against powdery mildew of cucumber in a greenhouse test. In particular, 0.3% canola oil emulsified with 0.08% yolk (1 yolk and 60 ml canola in 20 l spray) was found to be the most effective. The treatment resulted in 98.9% and 96.3% control efficacies on powdery and downy mildews, respectively, of cucumber in the field. Canola oil exhibited direct and systemic effect, wherein powdery mildew of cucumber was suppressed only on treated leaves but not on non-treated leaves in a plant, while mycelia and conidia of the pathogen were severely distorted or destroyed by the treatment. The prospect of using the canola oil and yolk mixture as a natural fungicide is highly promising because of its effectiveness, availability, low cost, simple preparation, and safety to humans and the environment. The use of the canola oil and yolk mixture is expected to be an effective fungicide for use in organic farming and home gardening.
Design and Implementation of the RF Systems for Bi-directional Wireless Capsule Endoscopes
Moon, Yeon-Kwan,Lee, Jyung-Hyun,Park, Hee-Joon,Lee, Ju-Gab,Ryu, Jae-Jong,Lee, Wu-Seong,Woo, Sang-Hyo,Won, Chul-Ho,Cho, Jin-Ho,Choi, Hyun-Chul Korea Multimedia Society 2006 멀티미디어학회논문지 Vol.9 No.12
This paper explains that the RF systems for hi-directional wireless capsule endoscopes were designed and implemented. The designed RF systems for a capsule endoscope can transmit the images of intestines from the inside to the outside of a body and the behavior of the capsules can be controlled by an external controller simultaneously. The hi-directional wireless capsule endoscope consists of a CMOS image sensor, FPGA, LED, battery, DC to DC Converter, transmitter, receiver, and antennas. The transmitter and receiver which were used in the hi-directional capsule endoscope, were designed and fabricated with $10mm(diameter){\times}3.2mm(thickness)$ dimensions taking into the MPE, power consumption, system size, signal to noise ratio and modulation method. The RF systems designed and implemented for the hi-directional wireless capsule endoscopes system were verified by in-vivo experiments. As a result, the RF systems for the hi-directional wireless capsule endoscopes satisfied the design specifications.
김환석(Kim Hwan-seog),유기한(Ryu Gi-han),최병갑(Choi Byung Gab),이천희(Yi Cheon-hee) 한국정보과학회 1992 한국정보과학회 학술발표논문집 Vol.19 No.1
본 연구는 schematic 자동 생성기를 구성하는 배치와 배선기 중 배선을 중심으로 기존의 channel routing 알고리즘을 검토하여 배선길이를 감소시키고 신호 흐름을 일정한 방향으로 일관성있게 배선하여 도면을 완성했을 때 가능한한 배선의 형태와 좋게 하였으며 schematic 자동생성을 위한 배선문제와 관련된 각 심볼의 핀과 이들 핀들을 연결하는 배선의 위치를 결정하는 문제와 이를 위한 신호선의 형태를 모델링하여 기존의 VLSI시스템의 channel router를 이용하여 schematic 자동생성기를 위한 심볼간의 배선을 행하였다.
이상철(Sang Chull Lee),김여갑(Yeo Gab Kim),류동목(Dong Mock Ryu),박영수(Young Soo Park),안재희(Jae Hee Ahn) 대한구강악안면외과학회 1982 대한구강악안면외과학회지 Vol.8 No.1
This is to report of extensive nasopalatine duct cyst developed in the midline of maxilla. 1. The patient, 32 year.old female, has being suffered from the swelling and pain on the upper anterior palatal and labial gingival area, and discharge through labial fistula. 2. X-ray findings revealed well-circumscribed round radiolucent shadow on the anterior midpalate which was diagnosed as extensive nasopalatine duct cyst. 3. Histopathologic findings showed the figures of typical nasopalatine duct cyst. 4. It was treated by a combination of marsupialization, enucleation and primary closure.