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이광원(Kwang-Won Lee),최순우(Swoon-Woo Choi),박철수(Cheol-Su Park),이주(Shu-Li),정용선(Yong-Sun Jung) 한국정보기술학회 2015 한국정보기술학회논문지 Vol.13 No.6
In this paper, We propose a prime-focus reflector antenna having a low back-radiation pattern at 18-GHz. The proposed antenna consists of a parabolic reflector, a small feed, a metallic shroud, a radio absorber and a sheet radome. The commercial software, Microwave Studio<SUP>TM</SUP> v. 2012 by CST, is employed in the design of the reflector antenna and the feed. In the initial design, the design specifications of the feed is acquired from the information of the reflectors diameter and focal length. The feed is minimized by employing a choke, a slit and a dielectric slab on the circular waveguide. The metallic shroud and radio absorber are employed on the reflectors edge for reducing the sidelobe and back-radiations. The feed and reflector antenna are fabricated and measured. The fabricated feed has a -10dB reflection coefficient over 15.7-20.6GHz. The fabricated reflector antenna has a -10dB reflection coefficient over 15.8-20.7GHz and satisfies the radiation envelope of the ETSI class-2. The measured efficiencies of the reflector are above 48% from 17.5GHz to 19.5GHz.
국내 방화규정에 따른 건축물 방화구획 성능 및 개선방안에 관한 연구
천우영(Chun, Woo-Young),이광원(Lee, Kwang-Won),이지희(Lee, Ji-Hee),김화중(Kim, Wha-Jung) 한국화재소방학회 2008 한국화재소방학회 학술대회 논문집 Vol.2008 No.춘계
Recently, the buildings have gradually become higher, more massive and more complex with high growth of economy and varieties of the patterns of people's living. Therefore we study a performance and Improving Methods of the fire compartment as a measure to minimize the damage of the people and property from the fire. Currently, under the economic crisis situation, we do not consider about prevention of disaster safety enough; safety investment evasion, safety carelessness, and management relaxation etc. Also in the aspect of regulation system, industrial technology and plan engineering, Korean techniques of preventing fire disasters are far behind of other advanced nations. At this point, we are in need of improving about it. When considering like this situation, we need more studies on the practical improvement in order to assure fire prevention for buildings. The fire compartment prevent from magnifying the fire to the wide area by compartment into specific area. From this, it is possible to minimize fire damage and property and secure emergency exit for life safety. This fire compartment has primary function to extinguish fire easily, and the openings and penetrations are important passage which makes the smoke and fire go away from the fire area to the contiguous space. This study suggests improving methods of domestic fire compartment efficiency standard through comparative analysis of overseas advanced provision and domestic provision about base element of the building fire prevention.
고재권 ( Jae-kwon Ko ),이광원 ( Kwang-won Lee ),오양열 ( Yang-yeol Oh ),최동수 ( Dong-su Choi ),김우재 ( Woo-jae Kim ),정종민 ( Jong-min Jeong ),정지웅 ( Ji-ung Jeong ),김현순 ( Hyun-soon Kim ),김보경 ( Bo-kyeong Kim ) 한국국제농업개발학회 2018 韓國國際農業開發學會誌 Vol.30 No.2
Since the first exportation of Korean rice to China in 2016, price competitiveness and problems during circulation in China have been traced. In the Chinese rice market, the price of the medium- and short grain milled rice imported from Japan and Taiwan was very high compared to that of Chinese rice, and two to three times higher than that of rice brand imported from Korea. So we concluded that the potential of the Korean rice to export to China is very high if the quality control is secured. It is believed that if the Korean rice was milled up to the whiteness greater than 40 and an embryo retention rate less than 3 % in summer and 5 % in winter, China consumers’ preference on Korean milled rice will increase. In order to prevent the vacuum loosening in the vacuum-packaged Korean rice, some suitable filling materials between the rice packages were needed, and the double sealing treatment was necessary at the time of packaging, with the heat treatment of 1 to 1.5 seconds at 130 to 150℃, as well as the vacuum pressure of 270 to 300 mmHg. It is also important to equip a handle on top of the package in order to provide the consumer’s carriage convenience when moving. For fumigation hydrogen phosphide was better than methyl bromide. For the rice exportation to the southern part of China, it is recommended to adjust the moisture content less than 13% considering that it is hot and humid.
구강건조증 환자에서 필로카핀 함유 껌 사용에 따른 전타액내 항균성분의 변화
박문수,이승우,정성창,김영구,염광원,Park, Moon-Soo,Lee, Sung-Woo,Chung, Sung-Chang,Kim, Young-Ku,Yum, Kwang-Won 대한안면통증구강내과학회 1999 Journal of Oral Medicine and Pain Vol.24 No.4
The purpose of this study was to investigate the effect of pilocarpine containing chewing gum on anti-microbial components in whole saliva of xerostomic patients, The objective xerostomic patients were instructed to use 5mg-pilocarpine containing chewing gum for 20minutes three times per day, and the author measured the flow rates of unstimulated whole saliva and stimulated whole saliva at the beginning the treatment, 1,2,3, and 4 weeks after. The concentration and flow rate of anti-microbial components in whole saliva were quantitated by enzyme-linked immunosorbent assay(ELISA). The obtained results were as follows: 1. There were significant increase in the unstimulated and stimulated whole salivary flow rate after using pilocarpine-containing chewing gum in xerostomic patients. 2. The concentrations of IgA in the unstimulated and stimulated whole saliva showed increasing pattern but, no significant changes, arid the flow rates of IgA in the unstimulated and stimulated whole saliva showed significant increase after using pilocarpine-containing chewing gum in xerostomic patients. 3. The concentrations of IgM in the unstimulated and stimulated whole saliva showed increasing pattern but, no significant changes, and the flow rates of IgM in the unstimulated and stimulated whole saliva showed significant increase after using pilocarpine-containing chewing gum in xerostomic patients. 4. The concentrations of lactoferrin in the unstimulated and stimulated whole saliva showed no significant changes, and the flow rates of lactoferrin in the unstimulated and stimulated whole saliva showed significant increase after using pilocarpine-containing chewing gum in xerostomic patients. 5. The concentrations of lysozyme in the unstimulated and stimulated whole saliva showed no significant changes, and the flow rates of lysozyme in the unstimulated whole saliva showed significant increase, but in stimulated whole saliva showed no significant changes after using pilocarpine-containing chewing gum in xerostomic patients.
신생 송아지에 있어서 Theileria sergenti 의 감염에 관한 연구
백병걸,임병무,이우종,김진호,김병수,손동수,이광원,Baek, Byeong-kirl,Rim, Byung-moo,Lee, Woo-jong,Kim, Jin-ho,Kim, Byeong-su,Son, Dong-soo,Lee, Kwang-won 대한수의학회 1993 大韓獸醫學會誌 Vol.33 No.4
The rate of 67 neonatal calves's infection of Theileria sergenti was investigated in random samples on the farms located in Kyeongki, Chonbuk and Jeju districts of Korea. The criteria used in verifying infection with T sergenti included the detection of parasites by giemsa's stain and acridine orange stain in the blood smear slides. Further evidence of current or previous exposure to T sergenti was based on the demonstration of T sergenti-specific antibody and antigen by the western immunoblot and the indirect immunofluorescence antibody test in the peripheral blood of the calves. The prevalence rates were 35%, 50% and 100% in Kyeongki, Chonbuk and Jeju provinces respectively and the overall prevalence in all the farms was 43.2% by means of acridine orange stain. The parasites that were observed in the peripheral blood of calves was shown surely by the western immunoblot to the characteristic 34KD antigen among the proteins of T sergenti (Korean Isolate). And the antibody of the neonatal calves reacted at the very highest titer(1 : >2,520). These data highlight the significance of T sergenti in the neonatal calf disease in Korea.
김영민(Young-Min Kim),최순우(Swoon-Woo Choi),이광원(Kwang-Won Lee),방재훈(Jae-Hoon Bang),안병철(Bierng-Chearl Ahn) 한국정보기술학회 2015 한국정보기술학회논문지 Vol.13 No.5
This paper presents a high-efficiency method for the wireless charger by adjusting the geometries of Tx/Rx coils surrounded by ferrite sheets. The proposed charger consists of a transmitting module, a receiving module and two coils for transmitting and receiving the wireless power. The transmitting module has a series capacitance for resonance of the Tx coil at 100 kHz, two half-bridge circutis based on the MOSFET technology for suppling the AC voltage by switching mechanism and a wireless power transmitting management chipset(bq500211A) for controlling overall structure. The receiving module is realized by a fabricated chipset(bq5101xB) having a rectifier, a voltage conditioning circuit and a controller. Two chipsets employed in the transmitting/receiving modules are controlled by a MCU program. The maximum charging efficiency of the charger is acquired by experimental methods which adjust the geometries of ferrite sheets around the Tx and Rx coils. From the fabrication and measurements, it is confirmed that the maximum charging efficiency is greater than 92% and the charging time is less than 200 minutes in the such case.
고해상능 전산화단층촬영을 이용한 폐기종 정량분석의 유용성 : 폐기능 검사와의 비교
임상묵(Sang Muk Im),이우식(Woo Sik Lee),구양수(Yang Su Goo),이강우(Kang Woo Lee),조영기(Young Ki Cho),강화원(Hwa Won Kang),최창한(Chang Han Choi),이광원(Kwang Won Lee),김동수(Dong Su Kim) 대한전산화단층기술학회 2006 대한CT영상기술학회지 Vol.8 No.1
Purpose The pathological severity of emphysema can be detected in high resolution CT well. We obtained mean lung density at inspiratory and expiratory, and percentage of emphysema subrange per slice through Quantitative emphysema CT. We tried to know the usability of Quantitative analysis in emphysema CT, the correlation between results of Quantitative emphysema CT and results of pulmonary function test such as forced vital capacity and forced expiratory volume in one second. Materials and Methods For this study, we selected 10 emphysema patients who had been found to have emphysema through high resolution CT and pulmonary function test during the period from june to august 2005, and who did not have accompanying diseases except emphysema. Also we selected 10 normal persons as a control group who did not have any history clinical disease or smoking in the past. In high resolution CT, we scanned the whole lungs on full inspiration and full expiration at slice thickness of 1mm and at intervals of 10mm using Somatom Sensation 16 with exposure conditions of 140kVp, 160mAs and algorithm B70 ultra sharp. In addition, we measured the area of emphysema by summing values obtained from each section through measuring the CT value inside the parenchyma of the lungs using a Quantitative CT software program. And calculated mean lung density and subrange percentage in the control group and the emphysema patient group on full inspiration and full expiration at pulmonary function test, and determined significance among them. Moreover, we compared forced vital capacity, which was an index of pulmonary function test for the emphysema patients, and forced expiratory capacity in one second for the emphysema patient group and analyzed significant differences using SPSS 10.0. Results Mean lung density of the emphysema patient group on full inspiration and that on full expiration were 895.59HU and 861.45HU, respectively, and their subrange percentages were 63% and 50%, respectively. Statistically significant differences were observed between the control group and the emphysema group in mean lung density and subrange percentage on full inspiration and full expiration. According to the result of analyzing the correlation of mean lung density and subrange percentage in the emphysema patient groups with the indexes of pulmonary function test such as forced vital capacity and forced expiratory volume in one second, statistically significant differences were observed in one second forced expiratory volume according to subrange percentage on full expiration. This suggests that quantative CT is a useful test for diagnosing emphysema and it is more effective to examine emphysema patients on full expiration. Conclusion According to the results of quantitative CT on the control group and the emphysema group, significant differences were observed between the groups in pulmonary function test, so the emphysema quantitative CT program appeared useful in analyzing emphysema but it is considered necessary to develop a pulmonary function quantitative CT that can examine patients with maintaining their breathing in a constant state.