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A New Control Scheme of Class-E Electronic Ballast with Low Crest Factor
Chon, Hyun-Son,Lee, Dong-Yun,Hyun, Dong-Seok The Korean Institute of Power Electronics 2003 JOURNAL OF POWER ELECTRONICS Vol.3 No.3
In this paper, a new control scheme of Class-E inverter for reducing the crest factor of electronic ballasts for fluorescent lamps using Pulse-Frequency-Modulation (PFM) is Introduced The lifetime of the lamps is guaranteed by decreasing the lamp crest factor and also voltage stress of the switch is significantly decreased by a new scheme although conventional Class-E Inverter is used In this paper. The proposed PFM control scheme didn't use any auxiliary circuit. The proposed control strategy is executed by feeding back the Input voltage, and the zero-voltage-switching (ZVS) is ensured by maintaining constant turn-off time of the switch Therefore, the control principles of proposed method are explained in detail and its validity is verified through several simulations and experimental results.
A New Control Scheme of Class-E Electronic Ballast with Low Crest Factor
Hyun-Son Chon,Dong-Yun Lee,Dong-Seok Hyun 전력전자학회 2003 JOURNAL OF POWER ELECTRONICS Vol.3 No.3
In this paper, a new control scheme of Class-E inverter for reducing the crest factor of electronic ballasts for fluorescent lamps using Pulse-Frequency-Modulation (PFM) is Introduced The lifetime of the lamps is guaranteed by decreasing the lamp crest factor and also voltage stress of the switch is significantly decreased by a new scheme although conventional Class-E Inverter is used In this paper. The proposed PFM control scheme didn't use any auxiliary circuit. The proposed control strategy is executed by feeding back the Input voltage, and the zero-voltage-switching (ZVS) is ensured by maintaining constant turn-off time of the switch Therefore, the control principles of proposed method are explained in detail and its validity is verified through several simulations and experimental results.
( So-hyun Chon ),( Min-a Kim ),( Han-saem Lee ),( Jeong-eun Park ),( Yu-mi Lim ),( Eun-jeong Kim ),( Eun-kyung Son ),( Sang-jun Kim ),( Jai-hyun So ) 한국응용생명화학회(구 한국농화학회) 2019 Journal of Applied Biological Chemistry (J. Appl. Vol.62 No.2
The mulberry tree (Morus alba L.) has been traditionally used in Chinese medicine to treat inflammatory diseases. We investigated the effects of bioconversion on different components of the mulberry tree, and determined changes in the physiological activities. Ethyl acetate-soluble fractions of five different segments (fruit, Mori Fructus; leaf, Mori Folium; twig, Mori Ramulus; root, Mori Cortex; and mistletoe, Loranthi Ramulus) of the mulberry tree show enhanced anti-oxidant effects in the 2,2-diphenyl-1-picrylhydrazyl, and 2,2'-azinobis-(3-ethylvenzothiazoline-6-sulfonic acid) assays, and enhanced anti-inflammatory effects of lipopolysaccharide (LPS)-stimulated nitric oxide (NO) production in RAW 264.7 macrophages, after being treated with a crude enzyme extract from Aspergillus kawachii, in the following order of activity: Mori Folium>Mori Cortex>Mori Ramulus>Mori Fructus> Loranthi Ramulus. Ethyl acetate- soluble fraction of mulberry leaves (Mori Folium) that underwent bioconversion was most effective, and was devoid of any cytotoxicity. The fraction was also effective against mRNA expression of LPS-induced proinflammatory cytokines, such as inducible nitric oxide synthase, cyclooxygenase-2, tumor necrosis factor-α, interleukin-1β, and interleukin-6. In addition, the fraction was effective in LPSinduced phosphorylation of mitogen-activated protein kinases and IKK, and IκB degradation, followed by translocation of the nuclear factor-κB from the cytoplasm to the nucleus. Thus, bioconversion increased the anti-oxidative and anti-inflammatory activities of the mulberry leaf.
Chon-Sik Kang,Kyeong-Hoon Kim,Young-Keun Cheong,Hag-Sin Kim,Young-Jin Kim,InDuck Choi,Jong-Chul Park,Sang-Hyun Shin,Jae-Han Son,Kyong-Ho Kim,Jong-Nae Hyun,Kee-Jong Kim,Chu Soo Park 한국육종학회 2013 한국육종학회 심포지엄 Vol.2013 No.07
“Baechal”, a winter wheat (Triticum aestivum L.) cultivar was developed by the National Institute of Crop Science, RDA, Iksan, Korea, during the period from 2006 to 2012. The heading and maturing dates of this variety were May 1 and June 5 in upland, and May 2 and June 8 in paddy field, respectively. It is an It is an awned, semi-dwarf and hard white wheat. Culm and spike length of “Baekchal” were 75cm and 8.7cm. It had lower test weight (794g/ℓ) and 1,000 grain weight (35.7g) than “Keumkang”. It showed moderate to pre-harvest sprouting, which lower rate of pre-harvest sprouting (13.7%) than “Keumkang”. “Baekchal” had similar ash content (0.47%) and protein content (13.1%) to “Keumkang”. It showed lower gluten content (9.6%), SDS-sedimentation volume (38.2㎖) and amylose content (6.5%) than “Keumkang”. It showed higher high viscosity (643BU), water absorption (213%), expansibility of cooking (357%). It showed different composition in HMW-GS compositios (2*), PPO18 (876bp), GBSS (waxy type) and Puroindolines composition compared th “Keumkang”. Average yield of “Baekchal” in the regional adaptation yield trial test was 4.89 ton/ha in upland and 4.83 ton/ha in paddy field. “Baekchal” would be suitable for the area above –10℃ of daily minimun temperature in January in Korean peninsula
Development of SCAR Markers for Korean Wheat Cultivars Identification
( Son Jae Han ),( Kyeong Hoon Kim ),( Sang Hyun Shin ),( Induk Choi ),( Hag Sin Kim ),( Young Keun Cheong ),( Choon Ki Lee ),( Sung Il Lee ),( Ji Yeong Choi ),( Kwang Geun Park ),( Chon Sik Kang ) 한국육종학회 2014 Plant Breeding and Biotechnology Vol.2 No.3
Amplified fragment length polymorphism (AFLP) is a molecular marker technique based on DNA and is extremely useful in detection of high polymorphism between closely related genotypes like Korean wheat cultivars. Six sequence characterized amplified regions (SCARs) have been developed from inter simple sequence repeat (ISSR) analysis which enabled the identification and differentiation of 13 Korean wheat cultivars from the other cultivars. We used six combinations of primer sets in our AFLP analysis for developing additional cultivar-specific markers in Korean wheat. Fifty-eight of the AFLP bands were isolated from EA-ACG/MA-CAC, EA-AGC/MA-CTG and EA-AGG/MA-CTA primer combinations. Of which 40 bands were selected to design SCAR primer pairs for Korean wheat cultivar identification. Three of 58 amplified primer pairs, KWSM006, KWSM007 and JkSP, enabled wheat cultivar identification. Consequently, 23 of 32 Korean wheat cultivars were classified by eight SCAR marker sets.
Chon-Sik Kang,Kyeong-Hoon Kim,Young-Keun Cheong,Hag-Sin Kim,Young-Jin Kim,InDuck Choi,Jong-Chul Park,Sang-Hyun Shin,Jae-Han Son,Kyong-Ho Kim,Jong-Nae Hyun,Kee-Jong Kim,Chu Soo Park 한국육종학회 2013 한국육종학회 심포지엄 Vol.2013 No.07
“Hojoong”, a winter wheat (Triticum aestivum L.) cultivar was developed by the National Institute of Crop Science, RDA, Iksan, Korea, during the period from 2006 to 2012. The heading and maturing dates of this variety were May 2 and June 10 in upland, and May 3 and June 7 in paddy field, respectively. It is an It is an awned, semi-dwarf and soft red winter wheat. Culm and spike length of “Hojoong” were 79cm and 9.1cm. It had lower test weight (803 g/ℓ) and 1,000 grain weight (39.5g) than “Keumkang”. It showed resistance to pre-harvest sprouting, which lower rate of pre-harvest sprouting (5.5%) than “Keumkang”. “Hojoong” had lower flour yield (66.7%) and ash content (0.38%) than “Keumkang”. It showed lower protein content (11.3%) and lower SDS-sedimentation volume (34.0㎖) and amylose content (20.5%) than “Keumkang”. It showed higher high viscosity (204BU) and lightness of noodle dough sheet (80.63). It showed different composition in HMW-GS compositios (2.2+12), PPO18 (876bp), GBSS B (null type) and Puroindolines composition compared th “Keumkang”. Average yield of “Hojoong” in the regional adaptation yield trial test was 5.51 ton/ha in upland and 5.10 ton/ha in paddy field. “Hojoong” would be suitable for the area above –10℃ of daily minimun temperature in January in Korean peninsula
Chon, Kwon Su,Park, Jeong Gon,Son, Hyun Hwa,Kang, Sung Hoon,Park, Seong Hoon,Kim, Hye-won,Kim, Hun Soo,Yoon, Kwon-Ha The Korean Society of Radiology 2009 KOREAN JOURNAL OF RADIOLOGY Vol.10 No.6
<P><B>Objective</B></P><P>To evaluate the efficacy for spatial resolution and radiation dose of a small-field digital mammographic imaging system using parabolic polycapillary optics.</P><P><B>Materials and Methods</B></P><P>We developed a small-field digital mammographic imaging system composed of a CCD (charge coupled device) detector and an X-ray source coupled with parabolic polycapillary optics. The spatial resolution and radiation dose according to various filters were evaluated for a small-field digital mammographic imaging system. The images of a test standard phantom and breast cancer tissue sample were obtained.</P><P><B>Results</B></P><P>The small-field digital mammographic imaging system had spatial resolutions of 12 lp/mm with molybdenum and rhodium filters with a 25-µm thickness. With a thicker molybdenum filter (100 µm thick), the system had a higher spatial resolution of 11 lp/mm and contrast of 0.48. The radiation dose for a rhodium filter with a 25-µm thickness was 0.13 mGy within a 10-mm-diameter local field. A larger field image greater than 10 mm in diameter could be obtained by scanning an object. On the small-field mammographic imaging system, microcalcifications of breast cancer tissue were clearly observed.</P><P><B>Conclusion</B></P><P>A small-field digital mammographic imaging system with parabolic polycapillary optics may be a useful diagnostic tool for providing high-resolution imaging with a low radiation dose for examination of local volumes of breast tissue.</P>
트랜스글루타미나아제 첨가된 국내 밀 품종을 이용한 파베이크 바게트 품질 평가
강천식 ( Chon Sik Kang ),신상현 ( Sang Hyun Shin ),손재한 ( Jae Han Son ),김경훈 ( Kyeong Hoon Kim ),최인덕 ( In Duck Choi ),박철수 ( Chul Soo Park ) 전북대학교 농업과학기술연구소 2013 농업생명과학연구 Vol.44 No.2
본 연구는 파베이크 바게트 제조에 적합한 TG 적정 함량을 구명하고, 국내 밀 품종을 이용하여 파베이크 바게트에 적합한 품종 선정을 위하여 실시하였다. 금강밀을 이용하여 파베이크 바게트 제조에 적합한 TG 함량을 검정한 결과 적정 함량은 0.2%였으며, 0.2% TG 첨가는 파베이크의 냉동 및 해동 과정으로 인해 발생하는 빵 부피의 감소를 막을 수 있다. TG 0.2%를 첨가한 파베이크 바게트의 국내 밀 품종의 품질 평가에서 금강밀, 조경밀과 알찬밀은 빵 부피가 크고 속질 경도가 낮아 적합한 품종으로 나타났다. 밀가루의 단백질 함량, 침전가와 반죽시간은 빵 부피와 정의 상관을 나타내었다. The objectives of this study were to investigate the effect of added transglutaminase (TG) on flour characteristics and quality of par-baked French bread, to determine optimum amount of TG in baking of par-baked French bread and to select cultivar for par-baked French bread in Korean wheats. In Keumkang, no significant difference in SDS-sedimentation volume and water absorption of mixograph was found in the addition of TG, but mixing time of mixograph with 0.6% of TG treatment showed longer mixing time than that of no TG treatment or 0.2 and 0.4% TG treatments. Bread weight of par-baked French bread increased as the addition of TG increased from 0.2 to 0.6%, compared to that of wheat flours with no TG treatment. Bread loaf volume of par baked French bread increased with 0.2% TG treatment, but bread loaf volume decreased with 0.4 and 0.6% TG treatment compared with fully baked French bread. Bread loaf volume with 0.2% TG treatment was similar to that of fully baked French bread. Therefore, we determined optimum amount of TG in baking for par-baked French bread. In evaluation of Korean wheat cultivars for par-baked French bread, Alchan, Jokyung and Keumkang showed higher loaf volume (820.00, 840.00 and 837.67 mL, respectively) and lower crumb hardness (4.98, 3.86 and 4.14 N, respectively) than other wheat cultivars. Bread loaf volume of par-baked French bread positively correlated with protein content (r=0.519**), SDS-sedimentation volume (r=0.419*) and mixing time of mixograph (r= 0.529**), respectively. Firmness of crumb positively also correlated with protein content, SDS-sedimentation volume and mixing time of mixograph, respectively.