자동차 엔진용 플라스틱 실린더 헤드 커버의 설계평가에 관한 연구

김정엽,이동명,최명진 경희대학교 산학협력기술연구원 1996 산학협력기술연구논문집 Vol.2 No.-

This study pertains to the feasibility of the conversion of an aluminum alloyed automotive engine cylinder head cover into a plastic cylinder head cover. Due to the complexity of the geometry, the finite element analysis is used to evaluate deformations and stresses, an adaptive method is also used to economize the computation. Without modification of the specification of the aluminum alloyed cylinder head cover, there will be no resonance but fracture is anticipated for the plastic cylinder head cover. To maintain the same dimensions, it is proposed to use a material with, at least, ?? Young's modulus.

제초제(propanil. butachlor) 저항성 잡초 선발 방법에 관한 연구

정성엽,김영미,박재현,이재현,김학윤,이인중,신동현,김길웅 경북대학교 농업과학기술연구소 1999 慶北大農學誌 Vol.17 No.-

This study was conducted to develop a simple selection method for herbicide-resistance weeds. Two methods, designated "seedling method" and "stem node method" were employed for screening of barnyardgrass against propanil and butachlor. In the seedling method, shoot and root growth of barnyardgrass were significantly inhibited at quarter of the recommended herbicide rate, while in the stem node method, the similar inhibition was obtained at half of the recommended rate. Thus, it was concluded that the seedling method is more simple and quick method to evaluate response of barnyardgrass to propanil and butachlor compared to stem node method.

S-상 심실중격의 임상적 고찰

이동민,장경식,양종태,장대용,김종오,서영욱,고영엽,홍순표 조선대학교 부설 의학연구소 2002 The Medical Journal of Chosun University Vol.27 No.1

Background: The sigmoid septum described an anatomical variation in the contour of the left ventricular outlet. It is related to degenerative change with aging. We observed clinical significance of sigmoid septum in Korean. Methods: Echocardiographic examination was performed in 434 patients. Sigmoid septum is defined as discrete bulging of the proximal interventricular septum with that thickness is greater than 1.3cm or the thickness is grater 1.5 times than adjacent mid interventricular septum in apical 3 chamber view. Result: The incidence of patient with sigmoid septum(septum patient) is 24.8% (male 8.4%, female 16.3%) . The incidence increases with age and is more common in women. The patients with sigmoid septum were compared with targeted groups, there was no significant difference in blood pressure between them, but in height and weight, the former were lower. (p<001, p<03). In the patients with sigmoid septum, weight and the surface area of a body have an opposite correlation with increase of age (p<03, r=-0.34) (p<04, r=-0.31) , but no decrease of height was found according to age increase (p=0.47, r=-0.11) The main reason patients with sigmoid septum ask echocardiolography and its clinical symptoms were abnormal results of previous electrocardiography and/or usual chest pain. Compared with control group, interventricular septal thickness is larger in septum patients (p<001). The thickness of interventricular septum located in subaortic left ventricular outflow tract is 1.6±0.3cm. There is another web like structure that continued from interventricualr septum to anterior free wall of left ventricle and the width is 1.6±0.4cm. A sign of insignificant obstruction due to left ventricular outflow was observed from three sigmoid septum patients. Conculusion: Septum patient is largely found in older age group and the body weight and body surface area are lower than control group. The body weight and body surface area are opposite correlation with age. So sigmoid septum is considered as structural change by weight reduction with aging. It is assumed that septum patients are related with asymptomatic ischemia because they have more abnormal ECG finding such as T wave inversion on precordial leads or standard leads, nonspecific ST-T change, LBBB etc. Sigmoid septum is not only proximal interventricular septal bludging but also another web like structure continuing to anterior wall of left ventricle.

콘크리트 비파괴강도 추정을 위한 인발시험법에 대한 연구

한만엽,김동욱 강원대학교 부설 석재복합신소재 제품연구센터 2000 석재연 논문집 Vol.5 No.-

본 연구의 취지는 좀더 정확한 비파괴검사법에 대해 고찰해본 결과 외국에서는 널리 사용되고 있으나 아직 우리나라에서는 거의 사용되고 있지 않은 인발법에 대해서 살펴보았다. 우리나라에서는 반발경도법이나 초음파법이 많이 사용되는데 이러한 방법들ㄹ은 사용자에 따라 그 값이 많이 차이가 나서 신뢰송이 떨어지는 것이 사실이다. 본 실험에서는 같은 시험체에다 인발법, 반발경도법, 초음파법을 적용하여 압축강도와의 상관성을 조사하였는데 그 결과 인발법과 반발경도법이 모두 압축강도와 상관성이 높은 것으로 나타났고, 초음파법은 상관성이 상당히 떨어지는 것으로 나타났다. 그러나 인발법은 반발경도법과 달리 연구자들간의 오차가 거의 없어 반발경도법과 달리 신뢰성있는 압축가동의 추정이 가능한 것으로 판명되었다. 아직 인발법에 과한 연구가 우리나라에서는 미진하나 금번 실험을 시초로 인발법이 우리나라에 많이 보급되어서 신설구조물이나 기존구조물의 비파괴강도 추정에 많은 도움이 되기를 기대한다. Pullout test known as Lok test among the nondestructive test methods to evaluate concrete strength is used to decide the form removal time by assessing the early strength of concrete in a new construction, or to control the quality of newly placed concrete. This method has inconvenience to place inserts on the form work in advance, however, the placing work is quite simple and it has advantage that the strength can be measured at field as long as the inserts are placed. In this study, the first step is to investigate the properties of test method itself, by performing the laboratory test which covers deviation of the method and properties of test method itself, by performing the laboratory test which covers deviation of the method and factors affecting the results, etc. The second step is to correlate the results with cylinder strength and other NDT methods such as rebound hammer, ultrasonic method, etc. And that, the results are compared with foreign results to find the differences between the two. In this research, new factors such as moisture content, area of aggregate failure cross section and area of aggregate separation cross section as well as water-cement ratio and age are investigated.

西海岸 베도라치類(Enedrias)稚魚資源

許聖範,유재명,金東燁 釜山水産大學校 1984 釜山水産大學 硏究報告 Vol.24 No.1

1980년 12월부터 1981년 7월까지와 1982년 2월부터 7∼8월까지 西海沿岸에서 베도라치類 稚魚資源을 조사한 결과 출현한 치어 가운데 Enedriasnebulosus의 稚魚出現 可能性을 배제할 수 없으나 대부분은 Enedrias fangi의 치어일 것으로 판단된다. 치어의 分布는 12월부터 시작되며 外海쪽보다는 沿岸에서 더 많이 分布했고, 2月 경우 於靑島 부근에서 가장 높은 분포를 보였다. 産卵은 12월부터 3월 사이에 행해지는 것으로 판단되며 치어의 월별·정점별 출현분포를 참고할 때 於靑島 부근과 加露林灣 外海쪽이 주 산란장으로 추정된다. 産卵은 滿 1年生부터 시작하여 평균 抱卵數는 918卵였다. 산란된 치어는 海況이 안정되고 먹이가 풍부한 內灣으로 回游하며 6∼7월에는 다시 外海의 成長棲息場으로 回游한다. 또 산란후 약 2個月이면 浮游幼生期를 마치고 表層에서 底層으로 이동한다. 稚魚期의 月別成長은 장기전에 걸친 産卵習性으로 정확한 월평균 성장률을 파악하기 힘들었으나 약 9mm정도일 것으로 思料된다. 한편 치어기로부터 未成魚期까지의 體長과 體重의 關係式은 W=1.67×10?L??(r=0.966)로 나타났다. 胃內客物 조사결과 稚魚期의 主된 먹이생물은 copepoda이며 decapoda와 cirripedia의 幼生, mysidacea, 卵稚魚 등도 중요한 먹이 생물로 이용되고 있다. 산란후 성장함에 따라 먹이 選好度는 넓어지며 成魚가 되면 amphipoda와 polychaeta가 主된 먹이 생물로 이용되고 있다. 서해연안에서의 베도라치類 稚魚의 資源量은 約 4∼5년 올 週期로 絶頂이 形成되는 것으로 추정된다. 이러한 年間漁獲變動은 단위 노력당 어획량의 자료 외에도 海況, 捕食者-被捕食者의 관계, 도는 生物學的 週期 等에 대한 구체적인 자운조사로 解析이 가능할 것이다. The gunnel larvae stock in the west coast of Korea was investigated on the taxonmical position, distribution, spawning, migration, growth, feeding habit and stock strucure. Though two species of Enedrias(E.nebulosus and E. fangi) distribute in the Yellow sea, the majority of the larvae which occurred during the study periods (Dec., 1980-July, 1981, and Feb.-Aug., 1982) seems to be fangi. Spawning takes place in December-March, and .the major spawning grounds seem to be near Eochung Island and at offsea of Garolim Bay. The fish begin to spawn from one-year-old group, and the average fecundity of this group is ca. 918 eggs with 0.72mm egg diameter in average. The larvae after hatching out begin to migrate into the nursing grounds at the coast or inner bay, and then migrate back toward the outbay. This migratory mechanism seems to be feeding and adult migration. The monthly growth rate during the larval stage seems to be ca. 9mm. Concerning the feeding habit of ,the larvae, copepod is the most important food organism. However, during the adult stage, polychaete and amphipod are major food organisms. The larvae of decapod and cirriped, mysid and fish eggs also occurred frequently in the stomach of the larvae.

Molecular Cloning and Characterization of a Large Subunit of Salmonella typhimurium Glutamate Synthase (GOGAT) Gene in Escherichia coli

Chung Tae-Wook,Lee Dong-Ick,Kim Dong-Soo,Jin Un-Ho,Park Chun,Kim Jong-Guk,Kim Min-Gon,Ha Sang-Do,Kim Keun-Sung,Lee Kyu-Ho,Kim Kwang-Yup,Chung Duck-Hwa,Kim Cheorl-Ho The Microbiological Society of Korea 2006 The journal of microbiology Vol.44 No.3

Two pathways of ammonium assimilation and glutamate biosynthesis have been identified in microorganisms. One pathway involves the NADP-linked glutamate dehydrogenase, which catalyzes the amination of 2-oxoglutarate to form glutamate. An alternative pathway involves the combined activities of glutamine synthetase, which aminates glutamate to form glutamine, and glutamate synthase, which transfers the amide group of glutamine to 2-oxoglutarate to yield two molecules of glutamate. We have cloned the large subunit of the glutamate synthase (GOGAT) from Salmonella typhimurium by screening the expression of GOGAT and complementing the gene in E. coli GOGAT large subunit-deficient mutants. Three positive clones (named pUC19C12, pUC19C13 and pUC19C15) contained identical Sau3AI fragments, as determined by restriction mapping and Southern hybridization, and expressed GOGAT efficiently and constitutively using its own promoter in the heterologous host. The coding region expressed in Escherichia coli was about 170 kDa on SDS-PAGE. This gene spans 4,732 bases, contains an open reading frame of 4,458 nucleotides, and encodes a mature protein of 1,486 amino acid residues (Mr =166,208). The EMN-binding domain of GOGAT contains 12 glycine residues, and the 3Fe-4S cluster has 3 cysteine residues. The comparison of the translated amino acid sequence of the Salmonella GOGAT with sequences from other bacteria such as Escherichia coli, Salmonella enterica, Shigella flexneri, Yersinia pestis, Vibrio vulnificus and Pseudomonas aeruginosa shows sequence identity between 87 and 95%.

Applications of genome-scale metabolic network model in metabolic engineering.

Kim, Byoungjin,Kim, Won Jun,Kim, Dong In,Lee, Sang Yup Published by Stockton Press on behalf of the Socie 2015 Journal of industrial microbiology & biotechnology Vol.42 No.3

<P>Genome-scale metabolic network model (GEM) is a fundamental framework in systems metabolic engineering. GEM is built upon extensive experimental data and literature information on gene annotation and function, metabolites and enzymes so that it contains all known metabolic reactions within an organism. Constraint-based analysis of GEM enables the identification of phenotypic properties of an organism and hypothesis-driven engineering of cellular functions to achieve objectives. Along with the advances in omics, high-throughput technology and computational algorithms, the scope and applications of GEM have substantially expanded. In particular, various computational algorithms have been developed to predict beneficial gene deletion and amplification targets and used to guide the strain development process for the efficient production of industrially important chemicals. Furthermore, an Escherichia coli GEM was integrated with a pathway prediction algorithm and used to evaluate all possible routes for the production of a list of commodity chemicals in E. coli. Combined with the wealth of experimental data produced by high-throughput techniques, much effort has been exerted to add more biological contexts into GEM through the integration of omics data and regulatory network information for the mechanistic understanding and improved prediction capabilities. In this paper, we review the recent developments and applications of GEM focusing on the GEM-based computational algorithms available for microbial metabolic engineering.</P>

Reconstruction and in silico analysis of genomescale metabolic network of Schizosaccharomyces pombe

Dong In KIM,Seung Bum SOHN,Tae Yong KIM,Sang Yup LEE 한국생물공학회 2013 한국생물공학회 학술대회 Vol.2013 No.4

Method of predicting human mobility patterns using deep learning

Kim, Dong Yup,Song, Ha Yoon Elsevier 2018 Neurocomputing Vol.280 No.-

<P>As human location and movement data are becoming easily accessible, owing to the prevalence of mobile devices, the use of such mobility data is gaining an increasing amount of interest. In our work, we establish a relationship between human mobility and personality, and attempt to model and predict movement patterns. Deep-neural-network and deep-belief-network models of deep learning are used in conjunction, for training the neural network. Both passive positioning information and active location information are used for the mobility information dataset, and the big five factors are used for the personality data. Both mobility information and personality information are split into training and verification groups, and are subsequently used to train and verify the neural network. The results are expressed in terms of hit ratios according to model factors comparing the predicted and observed values, and the parameters for the neural networks for the highest accuracy are identified. We use this optimal neural network to show the correlation between human personality and mobility patterns. Actual prediction is attempted, and is found meaningful in some conditions. (C) 2017 Elsevier B.V. All rights reserved.</P>

Particle Flux in the Eastern Bransfield Strait in 1999, Antarctica

Kim, Dong-Seon,Kim, Dong-Yup,Shim, Jeong-Hee,Kang, Sung-Ho,Kang, Young-Chul Korea Institute of Ocean Science Technology 2001 Ocean and Polar Research Vol.23 No.4

A time-series sediment trap was deployed at 1,034 m water depth in the eastern Bransfield Strait from December 25, 1998 to December 24, 1999. About 99 % of total mass fluxes were observed during the austral summer and fall (January, February, and March). The annual total mass flux was $49.2g\;m^{-2}$. Biogenic materials including biogenic silica, organic matter, and carbonate accounted for about 67% of total particle flux, and lithogenic materials contributed about 29%. Biogenic silica was the most dominant (42% of the total flux) in these components. The next most important biogenic component was organic matter, comprising 24% of total mass flux. Calcium carbonate contributed a small fraction of total mass flux, only 0.6%. The annual organic carbon flux was $5.2g\;C\;m^{-2}$ at 1,034m water depth. The annual primary production was estimated to be $21.6g\;C\;m^{-2}$ at the sediment trap site, which seems to be highly underestimated. About 5.5% of the surface water production of organic carbon sinks below 1,034m water depth.