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서정현(Jeong-Hyun Seo),신범재(Bhum-Jae Shin) 대한전기학회 2013 전기학회논문지 Vol.62 No.7
In this paper, the discharge characteristics of ac-type cylindrical discharge devices with diameters (D) in the 50~400μm range have been investigated numerically. The cylindrical devices have much lower breakdown voltages compared to the coplanar electrode structures. The breakdown voltage of the cylindrical structures increases with the decrease of diameters in 50~100μm range. In 100~200μm range, however, the breakdown voltage decreases slightly with the decrease of diameters. Also, as the diameter gets smaller, the electron heating efficiency is greatly improved.
비대칭 전극구조가 교류형 기체 방전의 발광효율에 미치는 영향
서정현(Jeong-Hyun Seo),신범재(Bhum-Jae Shin) 대한전기학회 2015 전기학회논문지 Vol.64 No.5
In ac discharge, emission efficiency shows an time-varying characteristics during discharge. The phenomenon is caused by the potential distribution changes during the discharge, which indicates that a specific potential distribution can contribute to a high improvement of the emission efficiency. To create an artificial environment for a potential distribution favorable to emission efficiency, we used the asymmetric electrode structure and proved the capability. Our results showed that the ratio of the area of anode to cathode became larger, the emission efficacy was greatly improved.
서정현(Jeong Hyun Seo),한원영(Won Young Han),고종민(Jong Min Ko),백인열(In Youl Baek),이병원(Byong Won Lee),윤홍태(Hong Tai Yun),이영훈(Young Hoon Lee),신상욱(Sang Ouk Shin),오기원(Ki Won Oh),하태정(Tae Joung Ha),최만수(Man Soo Choi) 한국육종학회 2021 한국육종학회지 Vol.53 No.3
‘Cheongmiin’ is a green seed-coated soybean cultivar developed from a cross between ‘Cheongjakong’ and ‘Daemang’ in 2002. The F₁ and F₂ populations were grown for 2 years, and promising lines were selected based on the pedigree method from generations F₃ to F₅. Preliminary and advanced yield trials were conducted from 2009 to 2010, and regional yield trials (RYTs) were conducted in eightregions from 2011 to 2013. ‘Cheongmiin’ is a determinate soybean with white flowers, green cotyledons, and spherical green seeds. Theaverage flowering and maturing dates of ‘Cheongmiin’ were August 1st and October 22nd, respectively. In terms of quantitative characteristics,‘Cheongmiin’ has a larger seed size (34.3 g/100-seed weight) than that of ‘Cheongdu1ho’ (24.5 g/100-seed weight), and has also been shownto be tolerant to lodging and pod shattering in the field in RYTs and oven drying tests, respectively. Furthermore, ‘Cheongmiin’ has beenfound to be resistant to bacterial pustules in the field and soybean mosaic viruses (G5H and G6H strains) in inoculation tests. The meanyield of ‘Cheongmiin’ in the RYTs was 272 kg/10 a, which was 4% higher than that of ‘Cheongdu1ho’. Given its large seed size and seedcoat color, ‘Cheongmiin’ is expected to be highly useful for cooking with rice and for the preparation of rice cakes (Registration No. 7688).
徐正炫(Jeong-Hyun Seo),姜景斗(Kyoung-Doo Kang) 대한전기학회 2008 전기학회논문지 Vol.57 No.4
In this paper, we have studied the basic discharge characteristics of ac-type cylindrical microcavity structure. The structure has a two electrodes, which are positioned in the bottom of the cavity and in the side wall of the cylinder, respectively. The discharge showed asymmetric phenomena depending on the position of a cathode electrode. When the bottom electrode was a cathode, the discharge was stronger even though the area of the cathode was smaller than that of the anode. Simulation results revealed that the focused electric field toward the bottom electrode increased ion density in the space which in tum strengthened the cathode sheath and ionization process.
퍼지적분을 이용한 DB-IR 통합기술의 실용화를 위한 수준 측정 방법에 관한 연구
서정현(Jeong-Hyun Seo),이희성(Hee-Seong Lee),김미혜(Mi-Hye Kim) 한국엔터테인먼트산업학회 2009 한국엔터테인먼트산업학회논문지 Vol.3 No.2
인터넷이 발달함에 따라 한 가지 소프트웨어 시스템에서 DB와 IR 기술을 통합하는 것에 대한 요구는 정보서비스 시스템의 결점을 극복하기 위하여 증가되어 왔다. 많은 연구자들의 노력에도 불구하고 DB-IR 통합 기술 개발의 진전은 완전하게 시장에 내놓기에는 여전히 충분하지 않다. DB-IR 통합기술을 한 가지로 수행하기 위해서는 세 가지 접근방법이 있는데, 실제 정보서비스 싸이트에 DB-IR 기술을 적용하고자 하는 시도가 있어야만 하며, 중간 개발단계에 있을지라도 DB-IR 통합 시스템 또는 IRMS가 사용자 수, 데이터 크기 등과 같은 몇 몇 실행 요소들을 고려하여 실제로 적용 되어져야만 한다. 본 논문에서는 ISS의 실행에 영향을 주는 항목들을 제시하고 퍼지평가를 이용한 수준평가를 제시한다. ISS의 실행을 위한 각각의 항목들의 기여정도를 결정하는 방법에 대한 퍼지평가를 적용할 것이다. With the advent of the Internet, requirements for unifying DB and IR technologies in one software system have been increased to overcome drawbacks of information service systems(ISS). For all that researchers" efforts, the progress of the development of DB-IR integration technologies still is not enough to bring them to the market as a whole. There are three approaches to accomplish DB-IR integration technologies into one, and someonewe have tried to apply it to practical information service sites and found that DB-IR integration systems or IRMSs could be applied to the real world with consideration of some performance factors such as number of users, data size, transactions on data, etc., even if it is in the middle of development. In this paper, we present factors which affect the performance of an ISS and give an equation for applying level evaluation(EFALE) using fuzzy evaluation. We will apply a fuzzy evaluation method to determine the degree of the contributions of each factor to the performance of an ISS.
서정현(Jeong Hyun Seo),홍채영(Chae Young Hong),신동억(Dong Eok Shin),강태수(Tea Su Kang),이준수(Junsoo Lee),정헌상(Heon Sang Jeong) 한국식품과학회 2020 한국식품과학회지 Vol.52 No.4
갈색거저리 유충 분말이 어묵의 품질특성에 미치는 영향을 살펴보기 위하여 갈색거저리 유충을 건조하고 분말화하여 첨가한 어묵의 품질특성을 분석하였다. 어묵의 수분함량은 갈색거저리 유충 분말 첨가량이 증가함에 따라 감소하였으며, 수분흡수력은 첨가량 증가에 따라 증가하였다. 색도는 첨가량이 증가함에 따라 L값이 감소하고 a값이 증가하였다. 조직감과 절단력은 0% 튀김어묵에서 각각 2.63 kg 및 0.09 kg이었으며, 첨가량이 증가함에 따라 증가하여 9% 첨가에서는 각각 3.18 kg 및 0.14 kg이었다. pH는 갈색거저리 유충 분말의 첨가량에 따라 유의적인 차이가 없었으며, 국물 탁도는 튀김어묵이 높게 나타났다. 관능검사 결과 색, 향, 맛, 조직감 및 전체적 기호도에서 0%와 3% 첨가군이 우수하였으며, 3% 이상의 첨가량에서는 첨가량이 증가함에 따라 낮아졌다. 이상의 품질특성과 관능특성 결과를 종합해보았을 때 어묵제조에 적합한 갈색거저리 유충 분말의 함량은 3%로 판단되었다. The quality characteristics of fish cakes containing different amounts of mealworm powder were analyzed. The moisture content decreased while water absorption index increased with the addition of mealworm powder. The L value was decreased but a value was increased as the amount of mealworm powder added increased. The hardness and cutting forces were 2.63 and 0.09 kg, respectively, in the 0% fried fish cake. With an increase in the amount of mealworm powder, the hardness and cutting force increased to 3.18 and 0.14 kg in the 9% fried fish cake. The pH did not differ with the addition of mealworm powder. During the sensory evaluation, 0 and 3% groups had the highest scores in color, flavor, taste, texture and overall acceptance. These scores decreased with increasing mealworm powder content. Based on the results of the quality characteristics and sensory evaluation, the amount of mealworm powder addition suitable for fish cake production was 3%.
서로 다른 전극간격에서 이차전자 방출이 글로우 방전에 미치는 영향에 관한 연구
서정현(Jeong-Hyun Seo),강경두(Kyung-Doo Kang) 대한전기학회 2009 전기학회논문지 Vol.58 No.4
In this paper, the effect of the secondary electron emission coefficient of Xe ion on glow discharge was examined by 1D numerical simulation. The simulation was performed for two distinct structures, short and long gaps. The features of the glow discharges in the both structures, firing and sustain voltages, luminance, and efficiency, were analyzed at various secondary electron emission coefficient of Xe ion.
정보교과교육 : 아두이노(Arduino)를 이용한 피지컬 컴퓨팅의 교육적 활용 방안 연구
서정현 ( Jeong Hyun Seo ),김영식 ( Young Sik Kim ) 한국컴퓨터교육학회 2012 한국컴퓨터교육학회 학술발표대회논문집 Vol.16 No.2
우리나라는 세계 1위의 IT 인프라를 갖추고 있지만 실제 교육 현장의 컴퓨터 사용 비율을 보면 응용소프트웨어 조작, 웹검색, 컨텐츠 소비 등과 같은 단순 사용 영역에 편중되어 프로그래밍 교육 비율이 높은 선진 이러한 문제를 해결하기 위해 최근 초등학교에서도 2007. 정보통신기술교육지침의 개정에 따라 컴퓨터교육이 응용프로그램의 활용에 그치는 것이 아니라 정보통신 기술을 활용하여 교과 및 실생활의 여러 문제들을 해결하고 알고리즘과 프로그래밍 학습을 통해 논리적 사고와 문제해결력을 기르기 위해 로봇이나 I/O보드 등을 이용한 피지컬 컴퓨팅(Physical Computing)에 대한 연구가 활발하게 이루어지고 있다. 본 연구에서는 프로그래밍을 처음 시작하는 학생들이 사용하기 쉽고 꾸준히 흥미를 유지할 수 있으며 다양한 분야에 적용 및 응용이 가능한 아두이노(Arduino)의 교육적 활용 방안에 대한 방안을 연구하고자 한다.