• Proceedings of KOSOMES biannual meeting
• /
• 2006.05a
• /
• pp.53-58
• /
• 2006

Recently, vessel's average speed in the sea becomes fast because of the increasing of high-speeds vessel like a container ship and ferry. So, it is considered that speed control in the korean narrow waterway isn't the proper vessel traffic management, now. And, there is a rare paper studied about speed control quantitatively and numerically, especially speed control is discussing continuously, as abrogation of Incheon Port's speed control and alleviation of Kwangyang Port's speed control a according to navigating mariner's request. After this paper replayed the navigation traffic flow in the straight waterway using marine traffic flow simulation, the Environmental Stress Model is introduced to evaluate difficulty of each vessel's traffic.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.12 no.2 s.25
• /
• pp.139-144
• /
• 2006

Recently, ships' average navigation speed become faster than before because of the increasing of high-speeds vessel including container ships and passenger-ferries. So, it is considered that the speed limit in the navigation channel in Korea isn't proper for vessel management in these days. Also, there is rare paper studies about the speed limit quantitatively and numerically, especially the speed limit is discussing continuously, as abrogation of Incheon Port's speed limit and alleviation of Gwang-yang Port's speed limit according to the requests by the navigating mariners. Consequently this paper deals with the effectiveness of speed limits using the Environmental Stress Model, after replay of the navigation traffic flow in the straight waterway using marine traffic flow simulation technique.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2004.11a
• /
• pp.73-80
• /
• 2004

Recently, many maritime accidents have been increased and the collisions due to human error are given a great deal of proportions out if them We develop the Real-time Collision Risk Monitoring System (CRMS) for the navigational officers to cope with the emergency situation promptly and thus to reduce the probability if casualty. In this study, the risk of collision is evaluated by two kinds if method. The first method is based on Fuzzy algorithm, which evaluates the risk of collision between traffic ships. The second method is based on Environmental Stress (ES) Model, where the total risk if collision is evaluated by the environmental stress felt by human. The developed real-time CRMS has been installed to the ship handling simulator system and its capabilities have been tested through simulator experiments.

• Korean Journal of Culture and Social Issue
• /
• v.12 no.1
• /
• pp.15-33
• /
• 2006

There are less studies on the adult suicide even though it's steep increase and negative effect on person itself, family and society. The purpose of the present study was to investigate factors that influence on the adult suicide and to categorize it. Using a case-study approach, a total of 61 cases were analyzed. Specifically, on the basis of the stress-vulnerability model, I scrutinized vulnerability factors(classified personal, family-environment, and social-environment factors) and precipitating events(classified personal, interpersonal events) influencing on the adult suicide. As the results of this study, adult suicide classified into 3 types, that is, 'risk type suicide', 'event-response type suicide', 'complex type'. And then I discussed the characteristics of the suicidal types and the method for reduction of adult suicide.

• Development and Reproduction
• /
• v.12 no.2
• /
• pp.117-124
• /
• 2008

The efficient strategies to cope with unpredictable and/or harmful environmental changes have been developed by every organism in order to ensure its survival and continuity of it's own species. As a results, all living things on earth maintain dynamically internal stability via a process termed 'homeostasis' among physiological parameters despite of external environment changes. Stress is an emotional and physical response to threat homeostasis. Stress may have not only transient but rather permanent effect on the organism; recent evidence clearly show that prenatal stress could organize or imprint permanently physiological systems without any change in genetic codes, a process known as 'epigenetic programming'. In this review, a series of reproduction-associated events occurred in prenatally stressed male rats such as alteration in the structure of sexually dimorphic brain regions, modification of neurotransmitter metabolism, changes in reproductive endocrine status, and finally, disorders of sexual behavior will be introduced. The fetal brain is highly sensitive to prenatal programming and glucocorticoids in particular have powerful brain-programming properties. The chronic hyperactivation of fetal brain by maternal stress-induced glucocorticoid input will provide new program via increasing the neuroplasticities. This 'increased neuroplasticities' will be the basis for the 'increased phenotypic plasticities' rendering the organism's better adaptation to environmental challenges. In conclusion, organism who experienced 'harsh' environment in his fetal life seems to give up a certain portion of reproductive competence to make good chance of survival in his future life by epigenetic (re)programming.

• Horticultural Science & Technology
• /
• v.32 no.5
• /
• pp.684-693
• /
• 2014

Abiotic stress conditions such as cold, drought, and salinity trigger physiological and morphological changes and yield loss in plants. Hence, plants adapt to adverse environments by developing tolerance through complex regulation of genes related to various metabolic processes. This study was conducted to construct a coexpression network for multidirectional analysis of salt-stress response genes in Brassica rapa (Chinese cabbage). To construct the coexpression network, we collected KBGP-24K microarray data from the B. rapa EST and microarray database (BrEMD) and performed time-based expression analyses of B. rapa plants. The constructed coexpression network model showed 1,853 nodes, 5,740 edges, and 142 connected components (correlation coefficient > 0.85). On the basis of the significantly expressed genes in the network, we concluded that the development of salt tolerance is closely related to the activation of $Na^+$ transport by reactive oxygen species signaling and the accumulation of proline in Chinese cabbage.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2021.06a
• /
• pp.115-115
• /
• 2021

식생은 증발산, 강우, 토양 수분 등 다양한 수문기상 요인과 밀접한 관계가 있기 때문에 식생의 상태는 가뭄 발생 시 물 부족에 매우 큰 영향을 받는다. 가뭄에 따른 식생의 변화와 영향을 파악하기 위해서는 식생-기후의 피드백을 이해해야 한다. 식생과 기후변수의 상호관계를 묘사하고 결합 확률을 구성하는 것은 식생-기후의 피드백을 이해하는데 적절하다. Copula 함수는 모든 변수를 연결하는 이점을 가지기 때문에 다양한 확률 변수를 결합하는 강력한 접근방법으로, copula를 통한 확률론적 접근방법은 수문 기상 스트레스에 대한 식생의 반응을 효과적으로 조사할 수 있다. 이에 따라 본 연구에서는 copula 기반의 식생-기후의 상호관계를 통해 가뭄 발생 시 식생이 받을 수 있는 영향을 정량화하고자 한다. 이를 위해 위성 자료를 활용한 식생건강성지수(Vegetation Health Index, VHI)와 위성관측된 강수 및 잠재증발산 자료를 적용하여 높은 공간 해상도에서 한국 전역의 식생 가뭄 가능성을 추정하고자 하였다. 강수 및 잠재증발산 자료를 통해 다양한 가뭄지수를 산정하고, copula 결합 이론을 기반으로 VHI와 가뭄지수 간의 이변량 결합 확률모델이 제안된다. 이에 조건부 확률을 적용하여 다양한 가뭄 시나리오에서 식생의 가뭄 가능성을 추정하고, 가뭄에 취약한 지역을 공간적으로 분석하고자 한다. 이를 통해 가뭄 스트레스에 따른 식생 변화와 생태학적 가뭄의 공간적 특성을 효과적으로 파악할 수 있을 것으로 기대된다.

• Aerospace Engineering and Technology
• /
• v.4 no.1
• /
• pp.86-94
• /
• 2005

This paper shows the results of design, analysis, manufacturing and test performed to develop the CTU(Command Telemetry Unit) EQM(Engineering Qualification Model). According to the key requirement specifications, the logics and circuits of each board are designed. In order to validate designs, some worst case, part stress, reliability, FMECA, radiation environment and launch environment analyses are performed. After manufacturing and assembling all boards, all functions of CTU EQM are verified through the functional test, environmental test and ETB test.

• Environmental Analysis Health and Toxicology
• /
• v.22 no.1 s.56
• /
• pp.9-17
• /
• 2007

Hermansky-Pudlak Syndrome (HPS) 환자에서 조기에 발생되는 폐섬유화의 원인을 알아보고자, 생쥐 HPS 모델인 ep/ep,pe/pe 돌연변이종의 폐 항산화계의 환성과 방사선에 대한 반응을 측정하였다. HPS 폐에서는 대조군에 비해 glutathione이 더 산화되어 있었고, catalase, glutathione S-transferase(GST) 등의 항산화효소의 활성이 저하되어 있었으며, 10 Gy의 방사선을 조사하였을 때, glutathione 양이 감소하였고, 대조군 폐에서 보여지는 방사선에 의한 ${\gamma}$-glutamylcysteine ligase(GCL), glutathione peroxidase(GPx) 활성의 유의성 있는 증가가 관찰되지 않았다. 이 결과로부터 HPS 환자의 폐는 항산화계 활성이 저하되어 있을 뿐 아니라, 산화적 스트레스가 가해 졌을 때 적응 반응이 매우 취약하여 산화적 환경에 노출된 폐의 병증을 유발할 수 있음을 추측할 수 있다.

• Proceedings of the KAIS Fall Conference
• /
• 2004.06a
• /
• pp.165-167
• /
• 2004

본 논문에서는 반도체 공정 시뮬레이션을 위해 산화, 확산 및 이온 주입 공정을 모델링하고, 효율적인 실행과 상호 연관된 연속 공정의 시뮬레이션이 가능하도록 통합화된 환경을 구축하였다. 점성적 스트레스 모델을 이용한 산화 공정은 유속-압력 알고리즘과 경계요소법을 이용하여 안정된 해를 얻었으며, 선확산과 산화중배 현상이 포함된 확산 공정은 전진해법과 유한요소법을 이용하였다. 또한 이온주입 공정은 TRIM을 기본으로 다양한 공정 조건에 대한 모델이 추가된 몬테카를로 방법을 사용하였다. 편리한 사용자 입력 인터페이스와 그래픽적 출력을 제공하고, 윈도즈의 API함수를 이용하여 PC상에서도 적은 메모리로도 빠른 결과를 얻을 수 있도록 하였으며, 객체 지향적인 모듈화로 타 시뮬레이터와의 호환성이 가능하도록 구성하였다.