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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.
김치 주·부재료의 활성산소에 대한 피부세포 독성완화효과
문정원,문갑순,전영수,류승희,이영순 부산대학교 김치연구소 1997 김치의 과학과 기술 Vol.3 No.-
피부세포인 Keratinocyte (A431:Epicermoid carcinoma, human)와 fibroblast(CCD-986SK, skin, normal control, human)에 산화적 스트레스를 유발하였을 때 김치의 투여는 활성산소종에 의한 세포독성을 현저하게 완화시켰다. 이러한 김치의 활성산소에 의한 세포독성 완화효과의 원인물질을 규명하기 위하여 김치의 주·부재료로 사용되는 시료들을 피부세포에 투여하여 활성산소에 대한 저항 효과를 살펴보았다. Keratinocyte에 대한 김치의 주·부재료인 배추, 무, 부추, 실파, 양파, 마늘, 생강 등의 세포독성실험결과 TD_50은 배추의 경우10%∼20%, 양파와 생강은 5∼10%, 무와 실파는 2.5∼5%, 부추는 0.62%∼1.25%였으며 마늘은 독성이 강하여 0.1∼0.2%였다. Fibroblast에서는 배추는 20%에서도 독성을 그다지 보이지 않았고 무, 실파, 양파는 10∼20%, 생강은 5∼10%, 부추는 2.5∼5%, 그리고 마늘은 1.6∼3.3%였다. 따라서, keratinocyte에는 부추와 생강은 0.62%, 마늘은 0.1%, 나머지 재료는 1.25%의 농도로 투여하고 fibroblast에는 부추와 생강은 1.25%, 마늘은 0.83%, 나머지 owfy는 2.5%의 농도로 투여하였다. 그리고, 산화적 스트레스를 유발시키는 과산화수소와 paraquat을 농도별로 투여하여 시료들의 황성산소에 대한 해독작용을 살펴보았다. Keratinocyte에서 장기간 시료와 과산화수수에 노출시켰을 때 부추, 마늘, 양파에서 세포 독성완화 효과가 나타났으며 특히 마늘의 경우 과산화수소 1mM 농도에서도 효과가 있었다. 단기간 시료와 과산화수소에 노출시킨 경우 세포생존율이 대조군에 비해 높게 나타났으며 생강의 경우 0.125mM 과산화수소농도에서 135%까지 생존율이 증가되었으며 부추, 마늘, 실파의 경우에도 세포독성 완화효과가 나타났다. 단기간 paraquat에 노출시킨 경우에도 대조군에 비해 모든 김치 재료에서 세포사멸이 억제되었으며 특히 부추에서 높은 생존율을 보였고 양파, 마늘, 생강의 경우에도 세포사멸을 억제시켰다. Fibroblast에서는 장기간 시료와 과산화수소에 노출시켰을 때 세포독성 완화효과가 두드러졌으며 낮은 농도의 과산화수소에서는 부추가 높은 과산화수소 농도에서는 생강, 마늘, 무에서 높은 세포독성완화효과를 보였다. 생강의 경우 과산화수소 4mM농도에서도 높은 세포독성 억제효과를 나타내었다. 단 기간 과산화수소에 노출시켰을 때도 장기간 노출시켰을 때와 마찬가지로 김치부재료들의 세포독성 완화효과가 현저하였고 특히 생강과 마늘에서는 고농도에서도 생존율이 높게 유지되었다. Paraquat에 노출시켰을 때의 김치 주·부재료들의 세포보호효과는 fibroblast를 사용하였을 때 보다 현저하지는 않았으나 역시 생강, 마늘, 부추에서 높은 활성을 나타내었다. Kimchi showed protective effect from oxidative damage generated by hydrogen peroxide and paraquat. To investigate the major components of kimchi which reduce the cytotoxicity against reactive oxygen species. keratinocyte(A431, epidermoid carcinoma, human) and fibroblast (CCD-986SK, normal control, human) were cultured in oxidative stress condition provoked by paraquat, a superoxide anion generator, and hydrogen peroxide in the absence and presence of kimchi ingredients. Most keratinocyte and fibroblast cells were killed by hydrogen peroxide and paraquat over 1mM concentration, but kimchi ingredients showed protective effects from oxidative damage generated by hydrogen peroxide and paraquat. In keratinocyte cell, the cytotoxicity of hydrogen peroxide was surpressed by leek, garlic, and onion, while garlic showed remarkably strong preventive effect. Most kimchi ingredients showed protective effect against paraquat, while leek notably increased cell survival. For fibroblast cells, ginger had the preventive effect from cell killing by high levels of hydrogen peroxide, but most ingredients were not effective against paraquat.
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.
문정원,권명자,문갑순,전영수,류승희,이영순 부산대학교 김치연구소 1997 김치의 과학과 기술 Vol.3 No.-
Kimchi is composed of many ingredients such as Chinese cabbage, garlic, ginger, red pepper and fermented fish extract. Some of them were known to have antioxidative activities due to their scavenging effect against reactive oxygen species(ROS). To study the health effects of kimchi on human skin cells, keratinocyte(A431, epidermoid carcinoma, human) and fibroblast(CCD-986SK, normal control, human) were cultured in oxidative stress condition provoked by paraquat, a superoxide anion generator, and hydrogen peroxide in the absence and presence of kimchi extract..The survival rate of keratinocyte was greatly reduced when exposed over 1mM concentration of hydrogen peroxide(H202), but cytotoxicity of H_2O_2 was significantly reduced by kimchi extracts on cells. Especially 2 week-fermented kimchi decreased remarkably the cytotoxicity by H_2O_2 to keratinocyte cells. Over ImM of paraquat concentration showed strong cell toxicity on keratinocyte, but the extracts from kimchi fermented for 1, 2 and 3 weeks showed protective effects in order. Fibroblast cells were significantly affected by H_2O_2 as were keratinocyte cells. Although almost all extacts of kimchi of different fermentation periods showed protective effect against cell killing at 0.5mM concentration of H_2O_2, 2 week-fermented kimchi extract showed the strongest protective effect on fibroblast cells treated with 1mM H_2O_2 for either 1 day or 4 days. However most of kimchi extracts showed weak preventive effect or no effect on oxidative stress produced by paraquat. In conclusion, 2 week-fermented kimchi extract seems to have the best potential in preventing skin cells against oxidative damage which might be related to their scavenging effects of kimchi components produced during their fermentation process.