• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.414-418
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• 2008

하천유지유량에 대한 인식과 개념은 시대와 사회, 경제의 발전에 따라 변화되어 새로운 물 배분 패러다임에 입각한 하천유지유량이 정립되고 있다. 우리나라에서 하천유지유량의 필요성이 제기되기 시작한 것은 댐 건설 이후부터이며, 하구의 염수침입을 방지하기 위해 하천에서 기본적으로 유지되어야 할 필요수량을 정하면서 부터이다. 실제적인 하천유역의 관리에서 댐 건설 이전에는 하천의 유량을 조절할 수 있는 능력이 거의 없었기 때문에 하천유지유량의 설정 자체가 크게 의미를 갖지 못하였다. 우리나라 하천유지유량의 주요 기능은 1960년대 이전에는 하천의 주운기능, 1970년대는 하구의 염수침입방지 기능, 1980년대는 수질보전을 위한 희석용수의 기능으로 인식되었으며, 1990년대 이후 환경에 대한 인식 변화로 수질과 함께 하천생태계 보전의 필요성이 증가하여 이에 대한 연구가 활발히 진행되어 왔고, 2000년대에 들어서는 자연환경을 중심으로 하는 하천유지유량과는 별도의 용수개념인 사회환경 개선을 위한 환경개선용수의 도입의 필요성이 제기되고 있다. 하천유지유량에서 고려하는 항목은 갈수량을 기준으로 하고 하천기능 유지에 필요한 하천생태 및 하천수질 보전을 기본항목으로 하여 고려하도록 하며, 현실적으로 하천유지유량 산정 검토시 부수적인 미미한 비중을 차지하고 있는 하천경관, 하구막힘 방지, 지하수위 유지, 하천시설물 보호, 염수침입 방지 등의 항목은 필요항목으로 구분하되 하천 상황에 따라 추가적인 항목에 대한 검토가 필요한 경우 감안할 수 있도록 하였다. 갈수량의 산정은 반드시 유역 개발과 각종 유수사용, 수공구조물에 의한 유량 조절 효과가 없는 자연상태를 기준으로 산정하도록 하고 어류생태를 고려한 필요유량 산정 시 대표어종은 하천의 특성을 고려하고 지역사회의 의견을 수렴하여 단일어종보다는 생태적 군(Guild, 군(群))을 고려하여 선정하고 최소유량의 개념보다는 계절별 유량변동성을 고려하도록 하였다. 수질보전에 필요한 필요유량 산정 목표는 생태계 서식 및 생육 환경의 보전과 인간의 물 이용 측면에서 요구되는 목표수질을 구분하여 적용하도록 하였다. 하천유지유량 이외에 친수공간 확보, 물놀이, 관광, 하천문화행사 등 사회환경 개선을 위해 하천의 일부구간 또는 일부지역에 필요한 수량은 이를 이용하고자 하는 수혜대상 집단(지자체, 특정 기관 또는 개인 등)의 요구에 의해 발생되는 수량이므로 환경개선용수로 분류하여 별도로 산정하도록 하였다.

• Journal of the military operations research society of Korea
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• v.36 no.3
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• pp.69-81
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• 2010

Since the mid-nineties, Republic of Korean Army has officially adapted information technology. Starting with the Chang-Jo 21('99) training M&S Model, around seventy types of the M&S system software, including Ground Operations & Resources Requirement Analysis Model ('10), developed by Republic of Korea Army or foreign counterparts have been utilized. However, as the existing cost estimations of the Defense M&S system software fail to reflect the acquisition and development environment, the estimated costs have been frequently overestimated or underestimated. This paper provides a suitable cost estimation model for the Defense M&S system software by presenting the software cost drivers which reflect the unique software development environment of the Defense.

• Journal of the military operations research society of Korea
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• v.32 no.2
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• pp.78-91
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• 2006

Recently mass customization has become a new paradigm in the global market to satisfy both the diversified demands of customers but also the efficiency of the mass production system. In this paper, mass customization is embodied by a new product development method with which various product families are produced from standard "product platform" developed from historical data. The product platform, the key concept of this proposed method, is significantly efficient as a solution to the customer demand of high variety and small quantity products. The proposed method is applied to build the platform family of naval ships, utilizing the concept of "Group Technology". In addition, cost effectiveness of the proposed method is analyzed and the applicable range of requirement conditions are presented. In conclusion, some remarkable effects such as reduction in production cost and development time are expected by employing this method to the procurement process of the naval ships.

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.2013-2018
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• 2007

최근에 발생하는 홍수특성은 단기간의 국지성 집중호우로 본류 대하천보다는 상류지역 지류하천이 특히 취약하여 이에 대해 하류보다는 상류, 본류보다는 지류위주로 과거와 다른 치수정책 전환이 요구되고 있다. 정부에서도 과거 치수대책이 제방위주의 선적인 개념에서 면적인 개념의 유역치수 중심의 방어형태로 추진하고 있으나, 상류지류 하천에 대한 홍수방어 계획은 부족한 실정이다. 지류하천에 홍수가 발생하면 홍수도달시간이 짧아 첨단홍수예보시스템으로도 대처가 곤란한 문제가 있으며, 이외에도 홍수와 함께 산사태가 빈번히 발생되고 토석류, 유목류가 한꺼번에 동반 유입되어 인명과 재산피해가 크게 발생하는 특징을 가지고 있다. 작년 7월 강원지역 집중호우에서도 인제군, 평창군 등 지류에 인명과 재산피해가 크게 발생한 것도 이와는 무관하지 않을 것이다. 최근 국지성 집중호우가 빈번히 발생하는 것은 기상적 측면이 아니더라도 우리나라는 하천경사가 급하고 산지가 국토의 약 70%로 구성되어 있어 지형적 측면에서 평화의댐(지체댐), 군남홍수조절지, 한탄강 홍수조절댐 등 대규모 홍수방어댐 도입시 홍수조절 효과가 우수하나, 대규모 댐건설에 따른 지역민의 불신, 환경단체 반발, 사회적 미합의 등 현실적인 제약조건이 많으므로 현실적이고 상류지역 지류하천에 효과적인 홍수조절을 위해서는 보호하고자 하는 도시 및 주요시설물시설에 대하여 소규모 홍수저류지(Detention Dam)를 상류 지류하천에 단일 또는 군(群)으로 도입하여 설치하는 방안을 적극적으로 추진하여야 한다고 사료된다. 소규모의 홍수저류지는 평상시에는 자연상태와 같이 전량 방류하고 갑작스런 홍수발생시 첨두홍수량을 지체하거나 감소시켜 하류지역에 홍수피해를 줄이는 시설로 기존의 댐보다는 규모가 적고 평상시에는 자연하천과 같이 물을 담지 않아 환경변화에 의한 영향이 적어 사회적 합의가 유리하고 친환경적이며, 홍수기에는 비어 있는 저류용량을 전량 활용이 가능하여 저수규모에 비해 홍수조절효과는 큰 장점이 있다. 특히 홍수조절의 본래 목적 외에도 초목류, 토석류 및 각종 부유쓰레기를 차단하는 사방댐 역할과 하류하천의 퇴사량 감소 등 다방면으로 효과가 있어 독일, 일본 등 선진국에서는 적극적으로 추진되고 있다. 본 연구에서는 선진 외국에 도입된 홍수저류지 사례를 조사 및 검토하여 국내에 적용 가능한 유역분담형 홍수저류지 규모 및 방식, 홍수저류지 도입방안과 향후 연구방향 제시하였다.

• Journal of the Korea Society for Simulation
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• v.26 no.1
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• pp.1-11
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• 2017

During the past several years the ROK military has made an effort to build LVC synthetic battlefield that reflects the real world environment. In spite of its efforts, little has been accomplished. The disappointing achievement is mainly due to the lack of operational requirements and concepts, and policies or systematic approaches on the architecture and technology. Furthermore, there is insufficient understanding on the basic concepts and principles, and conflicting interests between organizations. In this study, I propose to construct an LVC based on the HLA that focuses on the system view and technical standard view, rather than the operational view. The proposed approach employs the information centric integration, focuses on an architecture convergence efforts based on the HLA/RTI, emphasizes the HLA compliance test and federation test, adapts to DSEEP, DMAO, and FEAT, and finally invents and implements an LVC Compliance Test System.

• The Korean Journal of Applied Statistics
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• v.24 no.3
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• pp.559-566
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• 2011

Biplot is a useful graphical method to explore simultaneously rows and columns of two-way data matrix. In particular, canonical correlation biplot is a method for investigating two sets of variables and observations in canonical correlation analysis graphically. For more than three sets of variables, we can apply the generalized canonical correlation biplot in generalized canonical correlation analysis which is an expansion of the canonical correlation analysis. On the other hand, we consider the set of covariate variables which is affecting the linearly two sets of variables. In this case, if we apply the generalized canonical correlation biplot, we cannot clearly interpret the other two sets of variables due to the effect of the set of covariate variables. Therefor, in this paper, we will apply the partial canonical correlation analysis of Rao (1969) removing the linear effect of the set of covariate variables on two sets of variables. We will suggest the partial canonical correlation biplot for inpreting the partial canonical correlation analysis graphically.

• Journal of The Korean Association For Science Education
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• v.41 no.5
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• pp.359-370
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• 2021

This study aims to identify the characteristics of the program that integrates maker education with science subjects and to explore the maker's competency expressed in students. To this study, a maker activity program based on scientific concepts was developed and applied to 20 first-year students at H University in a general chemistry experiment course, and activity data were analyzed. The analysis results of maker activities based on scientific concepts are as follows. First, students performed activities through the process of 'presentation of ideas,' 'selection and planning of ideas,' and 'prototyping'. In particular, it was confirmed that prototyping was divided into stages of "partial prototyping" and "full prototyping". Second, as characteristics of the activity, 'use of scientific concepts as logic for coding in the process of maker activities', 'in-depth understanding of scientific concepts', and 'inducing high achievement and interest through transfer of initiative in learning' were confirmed. Third, collaboration competency and making performance competency were frequently expressed in the process of activities, but human-centered competency were rarely expressed.

• Journal of The Korean Association For Science Education
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• v.36 no.4
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• pp.591-606
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• 2016

The purpose of this study is to develop the argumentation program to build scientific concepts on natural selection for science-gifted elementary students and to know how to implement this program. For this study, nine key concepts about natural selection such as the overproduction of offspring, limited resources, population stability, competition, variation, heredity of variation, differential survival, change of the population and speciation were selected through the literature study. The programs were developed by learning cycle instructional model. Argument writings and discourses have been collected, analyzed and compared before and after the program. Two questionnaires to compare pre and post concept change consist of multiple choice questionnaire and open-ended response question were developed and applied to 19 science-gifted elementary students. Sufficiency of the explanation and conceptual quality of the explanation were used to assess the quality of their arguments before and after the program. Discourse and visual models collected from the highest and lowest group about score improvement were compared. The scores of the gifted statistically improved significantly in multiple choice questionnaire. Students' alternative conceptions about natural selection at the beginning of the program decreased and changed scientifically after the program. Visual models drawn by the students supported the results as well. This study asserts that elementary science-gifted students are able to explain evolutionary perspectives about organism change and use the key concepts of natural selection. The study means that evolutionary perspective is possible to be reflected in elementary science curriculum for the gifted.

• Korean Journal of Health Psychology
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• v.16 no.3
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• pp.537-555
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• 2011

The purpose of this study was two-fold. First, comparisons on the psychological and physical attributes of normal weight, overweight, and obese children were conducted. Second, the influence of BMI and physical fitness interaction on psychological adaptation in children with obesity was explored. Participants were 245 children between the ages of 9 and 13 years (64.5% males). Data on children considered overweight (n = 45) or obese (n = 78) were gathered from the Korean Obese Children's Physical Activity (KOCPA) projects. Normal weight children (n = 122) were recruited from two Seoul elementary schools. Psychological measurements included Weight Efficacy Life-style Questionnaire (WEL), Physical Self-efficacy Scale (PSES), Child Dietary Self-efficacy Scale (CDSS), Self-concept Inventory (SCI), and the Korean version of the Pediatric Quality of Life Intervention TM Version 4.0 Generic Core Scales (PedsQLTM4.0). BMI (kg/m2) and physical fitness (e.g., aerobic endurance, flexibility) were recorded by experts in exercise physiology. Results showed that children in the high BMI group reported poorer psychological adaption and demonstrated lower physical fitness when compared to the remaining groups. Compared to normal weight children, children considered overweight and obese were found to have lower physical self-efficacy, more negative self-concept, and poorer quality of life. Further, these children also had significantly lower physical fitness levels than their normal weight counterparts. Physical fitness was found to have a significant main effect on weight efficacy (WEL), physical self-efficacy (PSES), and quality of life (PedsQL) in children considered overweight or obese. A significant BMI-physical fitness interaction effect was found for self-concept (SCI) only. Children with higher BMI reported poorer self-concept regardless of fitness level whereas children with lower BMI and higher fitness reported more positive self-concept. Implications and limitations are discussed.

• Journal of Satellite, Information and Communications
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• v.9 no.3
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• pp.121-126
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• 2014

ETRI(Electronics and Telecommunication Research Institute) has joined National GNSS Research Center program of Defense Acquisition Program Administration and Agency for Defense Development in 2010. The research subject is technology for MSAR(Military Search and Rescue) system configuration. In this project, we analyses the ways in order to improve the accuracy, reliability, availability for MSAR system from M&S(Modeling and Simulation). The MSAR System M&S Software can be used for performance analysis of new elements, such as ground elements and satellite elements without any hardware development. In this paper, after introduction of the architecture design and functional scope of the simulator, the performance analysis result for MSAR M&S software is presented.