중부지역 옥수수 파종기에 따른 생육단계 및 수량성 변화

서종호, 문중경, 정건호, 서민정, 구자환, 박장환, 배환희, 신성휴, 권영업 忠北大學校 農業科學硏究所 2014 農業科學硏究 Vol.30 No.2

Maize hybrids were planted on April 1, April 25, May 20 and June 15 in 2012, 2013 at the experimental paddy and upland fields in Suwon city , respectively to know changes of growth stage and yield according to different planting time. Maize planting on April 1 was not recommended because total growing days at planting on April 1 was not different with that at planting on April 25 due to many days from planting to emergence over 20 days at planting on April 1. Total growing days were not much different among three planting time after April 25 because days from silking to maturity was lengthened though days from planting to silking was shortened at later planting time. Stalk weight was decreased as planting time was delayed, particularly at planting times after May 20 at paddy field by excess water injury during early growth stage. But, grain yield was not low as in May and June. It is needed to introduce early maturity maize variety as Yanganok at late planting for higher grain yield and enough time for soil preparation for next winter crops

원문 : 저항성 운동이 노화 흰쥐 해마 및 소뇌의 신경가소성 인자 발현 및 미세구조와 신경학적 기능에 미치는 영향

김종오 ( Jong Oh Kim ),윤진환 ( Jin Hwan Yoon ) 한국운동생리학회(구 한국운동과학회) 2014 운동과학 Vol.23 No.3

김종오, 윤진환. 저항성 운동이 노화 흰쥐 해마 및 소뇌의 신경가소성 인자 발현 및 미세구조와 신경학적 기능에 미치는 영향. 운동과학, 제23권 제3호, 217-228, 2014. 본 연구는 노화로 인해 나타나는 기억력 감소와 균형감각의 저하를 저항성 운동이 지연시킬 수 있는지와 그 기전을 밝힘으로써, 노인운동처방학적 운동기전을 제시하고자 하는데 있다. 이러한 목적을 달성하기 위해 노화 흰쥐를 대상으로 tower climbing 운동을 12주간 실시한 후 신경기능학적 향상, 신경가소성 인자인 BDNF, TrkB의 발현 증가와 시냅스 관련 단백질인 synapsin I의 발현을 유도할 수 있는 지와 해마의 연접형성수준의 증가에 어떠한 영향을 미치는 지를 확인하고자 하였다. 본 연구에 이용된 실험동물은 Sprague-Dawley 계열의 노화 흰쥐 72주령 수컷과 대조군으로 10주령 수컷이 이용되었으며, 이들은 실험 전 일주일 동안 운동 환경에 대한 적응기간을 거친 후, 무작위 표본추출에 의하여 노화 쥐는 노화 대조군(aging control group, ACG; n=15)과 노화 운동군(aging and exercise-trained group, AEG; n=15)으로 분류되었고, 10주령의 정상 대조군(normal control group, NCG; n=15)이 비교군으로 이용되었다. 저항성 운동은 tower climbing protocol을 이용하여 1일 약 30분씩 3회(09시, 14시, 20시) 12주 동안 훈련시켰다. 공간학습과 기억력과 균형감각과 신경학적 기능평가는 Morris water maze와 balance beam 검사가 이용되었고, BDNF, TrkB와 synapsin I과 같은 단백질 분석은 Western blotting 방법이 이용되었다. 또한, 해마부위 연접형성수준의 변화는 투과전자현미경(TEM)적 관찰을 통해 확인하였다. 그 결과 본 연구에 수행된 저항성 운동인 tower climbing 운동의 12주간 훈련은 노화로 인해 해마, 소뇌 부위의 신경 및 연접가소성인자 감소로 인해 저하된 공간학습기억능력과 평형감각기능을 지연시키는데 효과적인 운동임을 확인할 수 있었던 연구이다. Kim, Jong-Oh, Yoon, Jin-Hwan. Effects of Resistance Exercise on Synaptic Plasticity Factor, Ultrastructural and Neurologic-Function in Hippocampus and Cerebellum of Aging Rats. Exercise Science, 23(3): 217-228, 2014. Aging results in cognitive and balance decline both in humans and animals. Neurogenesis in the hippocampus and cerebellum also declines with age. Traditionally, exercise has been used for the treatment of several neuro degenerative disorders. Thus, the purpose of this study was to investigate the effects of resistance exercise on spatial learning memory ability, the synapses and the synaptic-plasticity neurotrophic factor in hippocampus and cerebellum in aged-rats. The experimental animals were divided into three groups (n=15 in each group): the normal control group (NCG), the aging control group (ACG), the aging and exercise-trained group (AEG). Animals in the exercise group were performed to daily exercise on the tower climbing during 12 weeks. The spatial learning and memory capability was evaluated by Morris water maze in a separate set of rats. Also, the balance function was evaluated by Balance beam test. Western blotting analysis for the expression of BDNF, TrkB and synapsin I was performed. Electron microscopy were used to evaluate synaptic plasticity and quantitative electron microscopy was used to investigate morphological changes in the hippocampus. Measurements taken from analysis of the electron micrograph sets were used to calculate the spine synapses in hippocampus. Here in this study, it have shown that both synaptic plasticity neurotrophic factor expression and spine synapses were suppressed in aged-rat, whereas tower climbing exercise alleviated the aging-induced suppression of both synaptic-plasticity neurotrophic factor expression and spine synapses in the hippocampus of rats. The results of the present study indicate that tower climbing exercise may facilitate recovery from the CNS complications associated with aging by inducing enhanced the morphological development of synapses in the hippocampus via the augmentation of synaptic plasticity neurotrophic factor expression in the h ippocampus a nd t he cerebel l um.

풍력 발전 시스템의 회전익 토오크 모델링

부성환,임종환,허종철,김건훈 濟州大學校 産業技術硏究所 1999 산업기술연구소논문집 Vol.10 No.2

풍력 발전 시스템의 회전익 토오크 모델링

부성환,임종환,허종철,김건훈 제주대학교 산업기술연구소 1999 尖端技術硏究所論文集 Vol.10 No.2

Torque generated by the blade of a wind turbine is a non-linear function of the wind velocity, the angular velocity of the rotor and the pitch angle. Glauert's theory for propellers, though widley used, is not suited to simulate the performance under variable wind speed and pitch angle. Furthermore, the numerical iteration procedure of the theory districts the applicability of a real time control of the wind turbine. We suggest a new method of modeling the torque that can be used in a real time control. Based on Glauert's theory, the power coefficient curve is estimated. In the vicinity of the operating point on the curve, a linearized model is extracted in terms of the wind velocity, the angular velocity and the pitch angle. the usefulness of the model is demonstrated with the results produced by sets of experiments.

주화 제조공정에서 금형 수명 연장을 위한 극인 문양의 심도 조정에 관한 연구

손종환,김종환 대구대학교 2006 대구대학교 학술논문집 Vol.1 No.2

본 논문에서는 주화나 메달의 제조 공정에서 금형의 수명에 큰 영향을 미치는 극인 문양의 심도를 조정하는 방법을 연구하였다. 먼저, 경계요소법을 이용하여 주화 제조 공정의 주요 변수인 문양 심도에 따른 전단 응력을 계산하였다. 이를 기초로 응력의 집중부를 찾아내어 실제 압인 실험에서 극인의 최초 균열 위치가 일치하는지를 검증하고 응력이 집중되어 균열이 발생한 부위를 다시 금형에서 수정하여 컴퓨터에 입력하고 프로그램에서 응력 값을 계산한 후 금형을 제작하여 금형 수명을 비교하는 실험 연구를 수행하였다. 그 결과, 주화 제품 제조를 위한 극인 문양 심도의 미세한 증감은 실험 대상 주화에서 0.005㎜ 문양 깊이 감소시 극인의 수명이 54% 증가한 것에서 볼 수 있는 것처럼, 극인 수명의 증감에 현저한 영향이 있음을 알 수 있다. This paper deals with a manufacturing conditions to increase the working die's life span which is the key factor in the manufacturing process of the coins and medals. Using the boundary element method, obtained is the stress diagram for the coining die, which is one of the most important parameters for the coining process. Based on the stress diagram, after found stress- concentrated part, it is certified whether the first cracked position correspond to the results of the BEM program. After adjusted cracked part by the stress concentration, We recalculate the stress and verified that modified the working die had a longer life span. Experimental results shows that the working die's life span was thoroughly depending on the depth of embossment. For example, 0.005㎜ decrease of the depth increased working die's life by 54%.

하종오 시의 "트랜스담론"과 "민족공동권" 소고

최종환 ( Jong Hwan Choi ) 韓國世界文學比較學會 2012 世界文學比較硏究 Vol.41 No.-

Ha, Jong-oh’s poem is beyond the simple diaspora literature since it shows that the situation of in-depth origins of the Republic of Korea is not much different than the surface through the vague voices of immigrant workers because even ethnic narrative related to the origin in ‘Trans space’ is questioned. In other words, it was shown that immigrant workers drawn by him are not the subjects welcomed in Korea as multi-cultural guests, but rather that self-evident ethnic origin is just the ‘flowing surface’ by separating the character of the state from the nation state, Republic of Korea. That is, their ‘external character’ rescales the Republic of Korea. The results of the study are as follows: First, he reveals through the gaze of immigrant workers who show ``curiosity`` about Korea that Korea is not a place only for Korean anymore but also a place which can be ‘used’ by occupiers. Second, this question was implemented as a cross-question about Korea``s National Ethics while comparing the lives of immigrant workers with the lives of animals. That was a question about globalism concerning manifold forms of violence, in other words, it was a question about the laws of Korea. Third, the poet knew that the national history of Korea was a place in conjunction with the ``transnational history`` of immigrants as a random narrative. If the first one was nothing but the nation’s rhetoric, the two were not opposing but related in parallel. That means that existing Korea was softened by setting Korea as a new space: through looking not at ``citizens / non-citizens``, but as ``occupiers``, he tries to set both histories as one joint ethic. Ha, Jong-oh’s poem is a ‘Trance Nation literature’ by trying to show that Korea’s ‘being Korea’ is not a matter of noble ethnicity, but consists of a ‘nation effect’. This new ‘sovereign place’, which has been used only by Koreans, is now used by ‘occupants’. This leads to global publicity which is the possibility of sovereign occupation of the immigrant workers and new publicity and universality.

총련계 재일여성시의 인문지리적 연구

최종환(Choi Jong Hwan) 한국비평문학회 2016 批評文學 Vol.- No.60

이 연구는 총련 문예동 소속 여성 시인들의 시를 인문지리학의 견지에서 살피고 있다. (신)문화지리학의 “보는 방식”(a way of seeing) 이론의 견지에서 그들 시가 ‘조국’을 경관화해 온 방식에 주목하고자 하였다. 그들 작품량이 많지 않은 관계로 조국의 지리학적 맥락이 분명이 펼쳐지는 부분을 중심으로 살폈다. 그들 무의식 층위를 분석하면 문예동의 일반 시인들이 그려온 ‘조국’ 지형이 일관된 것만은 아니었을 것이란 가설이 실제적으로 증명된다. 허옥녀와 강명숙의 시에 발현한 공화국의 지층은 그들 육친이 살아갔던 가정의 지층과 섞이기도 한다. 이 과정에서 그들의 독특한 조국-지리가 만들어지기도 했다. 주로 한으로 점철된 선친의 기억과 연계하면서 감성적 조국의 경관이 경험된 것이다. 그 기억에서 호출된 어머니는 ‘전사 어머니’ 위치로부터 풀려난 ‘죽은 어머니’, ‘엄마’, ‘딸’, ‘며느리’, ‘손녀’, ‘소녀’ 등으로 이동한다. 그것이 문예동의 것과는 다소 미세한 조국의 경관을 구성한다. 이 각 위치에서 나타난 조국은 그 상응 경관을 합성하면서 문예동의 관념화된 조국과는 다른 경관을 드러낸다. 때문에 이 두 시인에게 조국은 무오류의 공화국 공간으로만은 나타나지 않는다. 눈물로 가득하거나 시취(屍臭) 풍기는 공화국이 거기에 있다. 이 조국의 경관 속에는 일반적인 문예동 그룹에서는 1990년대까지 말하기 어려웠던 병고, 죽음 문제도 녹아 있다. 때때로 그들은 고독이 이는 자신의 가정 안으로 김일성이나 김정일의 얼굴까지 초대한다. 아울러 죽은 모친을 공화국의 목련 나무에서 피어나게도 했다. 이는 문예동 여성시인들이 그린 한반도 지도가 문예동의 지도를 예민하게 벗어나는 곳에서도 그려졌음을 지시한다. 이 시각은 지금까지 공간이나 지대 위주로 접근해 온 디아스포라문학 연구의 관성을 극복케 할 것으로 예상된다. This study examined the works of female poets belonging to the Chongryun “Munyedong” from the perspective of the (new) cultural geography. In particular, the manner their poems depicted their mother country was analyzed based on the theory of “a way of seeing.” Since there were a limited number of poems, the parts with a clear geographical personality were the focus of the examination. This analysis of the subconscious strata of poetry written by female Koreans living in Japan reveals the truth of their beliefs suggesting that the topography of their mother country outlined by the Munyedong group is not consistent. The poems of Heo Oknyeo and Kang Myungsuk show glimpses of a situation in which the stratum of the republic in which the leader exists mixes with the stratum of the family in which their blood relatives once lived to form a geography of the mother country. The geography of their mother country emerges as an emotional landscape of the motherland as it connects to the inner turmoil of their late father who was plagued with deep sorrowful resentment. The mother, summoned from memories, migrates from the position of ‘warrior mother’ to positions such as ‘departed mother’, ‘mother‘, ‘daughter’, ‘daughter-in-law’,‘ ’granddaughter’, and ‘girl’, and this allows the reader to experience a corresponding microscopic landscape of the mother country. The landscapes of the motherland presented from each of these posts are often complex. For the two poets, the mother country appears as a place filled with tears or as the face of a cosmos flower exuding the brilliant scent of corpses. Among these are included even the cries related to sickness and death, which the mainstream poets of the Munyedong found difficult to address until the 1990s. Furthermore, they invite the faces of Kim Il-Sung or Kim Jong-Il into the family where desolation would spread. This mingling of scenes portrayed the dead mother as a hortensia flower blooming from a magnolia tree in the republic. This is a case that “actualizes” the fact that the map of the Korean peninsula outlined by female Korean poets living in Japan was slightly different from the ideological map of the mother country drawn by the mainstream poets of the Munyedong. The human geography perspective of this research is expected to allow the study to go beyond the current inertia of diaspora literature that has approached the subject mainly through space or location

A Korea-Kenya Free Trade Agreement and Its Economic Impact: A Computable General Equilibrium Approach

Geoffrey Musyoki Kitetu(Geoffrey Musyoki Kitetu ),Jong-Hwan Ko(Jong-Hwan Ko),Esambe Sone(Esambe Sone) 한국무역연구원 2023 무역연구 Vol.19 No.1

Purpose – This study assesses the impact of a potential Korea-Kenya FTA on the global economy, which includes the US, EU, UK, China, and Japan, using the Global Trade Analysis Project (GTAP) model. Design/Methodology/Approach – The study employs a static global multi-sector CGE model using the GTAP database version 10 with the base year of 2014. For this study, we aggregate the 141 regions and 65 sectors of the GTAP database into 16 regions and 57 sectors. Four policy simulations were implemented based on tariffs and ad valorem equivalents (AVEs) of non-tariff measures (NTMs) estimated by Kitetu and Ko Jong-Hwan (2021). Findings – Simulation results suggest that the real GDP of Korea will likely increase by 0.001% to 0.002%, with welfare increasing by US$1.8 million to US$74.7 million. In comparison, the real GDP of Kenya will likely rise by 0.003% to 0.045%, while welfare will rise by US$1.8 million to US$ 75.3 million. Imports by both countries will rise at a higher rate than exports. For Kenya, domestic output increases in agriculture, extraction, and service sectors, and for Korea, output goes up in processed food and light and heavy manufacturing sectors. Research Implications – The novelty of this paper is in the first empirical quantification of the economic impact of a Korea-Kenya FTA on not only its members but also its trading partners, such as the US, EU, UK, China, and Japan. Moreover, this study provides a comprehensive overview of the impact of a potential FTA between Korea and Kenya by reducing and eliminating tariffs and AVEs of NTMs.

엔로플록사신 액제의 닭유래 병원세균에 대한 시험관내 항균효과 시험

윤효인,박병권,조준형,정상희,박경환,장범수,김종춘,황윤환,임종환,이내경,박승춘 충남대학교 수의과대학 동물의과학연구소 2000 動物醫科學硏究誌 Vol.8 No.-

In this study the antimicrobial spectrum and sensitivity of a liquid formulation of enrofloxacin against the major six pathogenic bacteria isolated from the diseased poultry in Korea were evaluated in comparison with ciprfloxacin (CFX), gentamicin (GM) and penicillin (PC). A liquid form of enrofloxacin, a test material and ciprofloxacin showed at least 83% antibacterial activity against all of six test pathogenic microorganisms at the fixed concentration of 10 ㎍/㎖. Gentamicin and penicillin revealed much lower antibacterial activity at the same condition. We evaluated the liquid form of enrofloxacin as having widespread antibacterial spectrum against poultry infections. The liquid form of enrofloxacin showed potent antibacterial activity, with the MIC range being 0.12∼2 ㎍/㎖ against Gram positives, 0.06∼2 ㎍/㎖ against Gram negatives and 0.5∼2 ㎍/㎖ against Mycoplasma spp. These values were equivalent to or somewhat higher than those of ciprofloxacin, but much lower than those of gentamicn and penicillin. This new liquid form of enrofloxacin would find its way in application of mixing with drinking water for the prevention and treatment of diverse infections in chickens.

엔로플록사신 액제의 닭 호흡기 및 소화기 감염증에 대한 예방 및 치료효과

윤효인,박병권,조준형,정상희,박경환,장범수,김종춘,황윤환,임종환,이내경,박승춘 충남대학교 수의과대학 동물의과학연구소 2000 動物醫科學硏究誌 Vol.8 No.-

We evaluated the efficacy of the liquid form of enrofloxacin against poultry respiratory and digestive infections, the major problems in the poultry industry, from diverse diagnosis viewpoints. Results obtained through this study were as follows: 1. The liquid form of enrofloxacin showed good acceptability to poultry owing to no abhorrence to the drug by chickens, which indicated its suitability for mixing in drinking water. 2. The application of the enrofloxacin formulation improved the productivity of the chicken farm to a great extent by lowering the death toll of chicken raised in the farm. 3. The use of the drug shortened the days to the market, and increased the body weight at the time of marketing. 4. Preventive and therapeutic effects of the liquid enrofloxacin were observed higher than ampicillin, a major antibiotic used in poultry farming. From above results, the liquid form of enrofloxacin would find its use for the prevention and treatment of digestive and respiratory infections, let alone the growth promotion and feed efficiency, especially in the chicken farming practice.