• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2010.11a
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• pp.533-536
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• 2010

It has been manufactured the a prototype of the oxygen rich preburner which can be used for a small high performance liquid rocket engine. Based on the model designed and analyzed by KARI a series of the work was made. First, the layout was drawn and then two kinds of the test specimen were devised and manufactured for the hydraulic and pressure test respectively. It was confirmed that the details in designing and manufacturing the preburners. All of them efforts may help establish the bases to develop high performance liquid rocket engine.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2003.05a
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• pp.38-40
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• 2003

본 연구에서 적용한 저 NOx 연소법의 NOx 저감 효과를 비교해 보면 다단 연소법이 지연연소 효과와 국부적인 최고 화염온도 감소, 고온부에서의 산소농도 감소효과 등이 동시에 나타나 저 과잉공기 연소법, 배기가스 재순환법, 이단 연소법 보다 더 큰 NOx 저감효과를 얻을 수 있음을 알 수 있었다. 다만, 총 공급공기 량에 대한 분할 공급공기량의 비가 일정수준 이상으로 커지면 CO 발생량 증가로 효율저하 등의 문제점이 우려되므로 연소상태를 저하시키지 않는 공급비를 산정하는 것이 중요할 것으로 생각된다.

• Digital Contents
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• no.10 s.89
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• pp.43-47
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• 2000

최근들어 인터넷 방송이 폭발적으로 증가하고 있는 추세이다. 물론 이들 인터넷 방송국의 규모에 있어서도 사별로 큰 차이를 보이고 있다. 일부에서는 닷컴 위기론과 편성해 인터넷 방송의 공급과잉을 우려하는 목소리를 높이고 있다. 물론 이러한 우려의 목소리에는 현실에 대한 정확한 판단이 들어 있기도 하다. 하지만 현재 일반적으로 인터넷 TV가 운영되고 있는 것과는 달리 인터넷과 TV의 단순한 결합이라는 의미를 넘어서 종합적인 커뮤니티와 매체로서의 기능이 잠재되어 있다고 볼수 있다. 그 시장 또한 발굴하기에 따라서 무한하다고 할 수 있다. 다만 수익모델을 광고에 치중한 경영을 한다는 것은 위험성을 내포한다. 다양한 수익모델의 발굴과 인터넷 TV를 이끌어갈 인재양성, 기술개발 등 인터넷 TV가 해결해야할 과제는 아직도 산적해 있다.

• 한국벤처창업학회:학술대회논문집
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• 2007.04a
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• pp.187-199
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• 2007

항만의 개발은 투자시점에서 10여년이 소요되는 대규모 자본과 시간이 소요되는 사업이므로 항만 물동량을 사전에 정확히 예측하지 못하면, 과잉투자, 중복투자 또는 기관시설이 부족하는 등 큰 문제에 봉착하여 진다. 항만 물동량 예측은 항만 개발에 앞서 매우 중요한 과제이다. 따라서 본 논문에서는 파워심 프로그램을 활용한 항만 물동량 예측 시뮬레이터 개발에 앞서 기초 연구단계로 항만 물동량 발생 요소들의 관계를 정립하고 인과관계를 시스템 다이내믹스 기법을 이용하여 밝혔다. 이 시뮬레이터는 항만 물동량 예측 등 관련 산업기술 발전에 기여하리라 전망된다.

• Proceedings of the CALSEC Conference
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• 2001.02a
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• pp.521-529
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• 2001

Market Transparency : ● 가격의 투명 - 시장 통합화 / 지역과 고객 수 / 다양한 가격 ● 재고의 투명 - 필요시 즉시 확인, 즉시 구매 가능 ● 공급자 투명 - 기존 공급선외 타 생산자 여부 확인 ● 제품의 투명 - 기존제품 대체가능, 제품선택 다양 ● 시장정보 공유로 투명한 거래 형성 Buyers와 Sellers간 다양한 정보공유 과잉재고, 배송과정, 결재상태 등 파악용이 ● 업체간 과도한 가격인하 경쟁 지양 사전 공개된 가격과 품질, 서비스 영향임 독자 기술제품은 다수의 Buyers가 경쟁 ● 산업별 시장집중화 현상 발생 정확하고 간소한 주문 Processing영향. 업무비용 절약, 현 고객관리 기획 확대(중략)

• The Journal of Korean Academy of Sensory Integration
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• v.18 no.1
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• pp.56-72
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• 2020

Objective : The purpose is to analyze the effects of parent training interventions in reducing the symptoms of Attention Deficit Hyperactivity Disorder (ADHD) and to provide a basis for the effects. Methods : We collected literature published in international academic journals from 2009 to 2019 through ProQuest and Scopus databases. The search key terms were (ADHD OR Attention Deficit Hyperactivity Disorder) AND (Parent OR Mother OR Father) AND (Training OR Program OR Therapy OR Intervention) AND (Randomized OR Randomised OR Randomly). The PEDro scale was used to evaluate the quality of the studies, and a meta-analysis was conducted through Comprehensive Meta-Analysis 3.0. Results : Of 628 studies that we reviewed, 20 were eligible for inclusion. of parental training interventions for children with ADHD appeared close to a medium effect size while parent-child interventions (0.639) appeared to have a medium to large effect size. Oppositional defiant behavior and conduct disorder (0.737) in children and children's emotions (0.679) appeared close to a large effect size. ADHD symptoms hyperactivity and impulsivity (0.590) and child behavior (0.521) appeared to be over a medium effect size. We chose a random-effects model since heterogeneity tests showed significant results. Conclusion : We were able to confirm the effects of parent training interventions on the symptoms of children with ADHD. This will be used as evidence to provide a clinical basis for occupational therapists. More research related to parental training interventions should be carried out to ensure better reporting in the future.

• KDI Journal of Economic Policy
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• v.14 no.3
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• pp.3-21
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• 1992

By localizing the production of core parts and intermediate goods previously imported from Japan, Korean firms have been striving to increase their market share and profit in the final goods market in which Japanese firms are dominating. Korean producers' efforts, however, have often been thwarted by Japanese suppliers' "strategic" behavior. This competitive strategy involves Japanese exporters supplying parts and intermediate goods at very high prices until Korean firms must locally develop them, and then setting the prices far below the previous level so that the profitability of localization is dramatically reduced, or even means a loss for the Korean manufacturer. This paper intends to explain the strategic behavior of Japanese firms through the concepts of strategic interactions and joint economies. Strategic interactions can be aggressive or accommodating depending on whether competitors are dealing with strategic substitutes or complements. Joint economies exist in multi-stage competition when competition in the previous state favorably influences "profits" of the ensuing stage. Competiton between Korean and Japanese firms (a two-stage game involving production and technology rivalries) can be characterized by joint economies and strategic substitutes: joint economies since technological improvement results in more profits in the production stage; and strategic substitutes since an increase in marginal profits of one firm brings about a decrease in marginal profits of the other in a duopolitic production stage. This implies that the flood of "low price" Japense substitutes is an almost "natural" phenomenon in the context of the duopolistic market described in this paper. In the technology competition stage, on the other hand, technology development and technology transfer can be either strategic complements or substitutes. This implies that, in typical comparative static analyses, the effect of changes in exogenous variables cannot be expected a priori. Thus it becomes very difficult to determine the desirability of applying various policy measures such as countervailing duties, R&D subsidies, and creating demand for localized products. For these reasons, it is indeed likely that the measures suggested as means of circumventing the strategic behavior of Japanese firms (and enhancing technological development of Korean firms) may not work.

• The Journal of Korean Academy of Sensory Integration
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• v.15 no.1
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• pp.21-32
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• 2017

Objective : The purpose of this study is to explore the effectiveness of a perceptual motor program in promoting visual motor and motor control outcomes in a child with Attention-Deficit/Hyperactivity Disorder (ADHD) who is enrolled in an elementary school. Methods : The subject is 8-year-old boy who was diagnosed with ADHD but did not receive medication. Research design is a single-subject A-B-A(follow-up). Baseline and follow-up phase were 3 sessions and intervention phase were 8 sessions. After performing 40 minutes of free play on the baseline A and follow-up A, we used the copying subtest of the Korean Development Test of Visual Perception 2 (K-DTVP-2) for evaluating visual motor integration skill and the rope jumping subtest for motor skill. After providing the perceptual motor activity in intervention phase B, copying and ropejumping were performed. Results : The standard scores of the Copying for measuring visual motor integration skill were poor at an average of 4.7 points at baseline phase A, but maintained an average of 9.6 points at intervention phase B and an below average of 7.7 points at the follow-up phase A. In the Rope jumping for the motor skill, it was increased by 4.3 times in the baseline phase A and 5.9 times in the intervention phase B, but slightly decreased by 5 times in the follow-up phase A. Conclusion : This study suggests that perceptual motor program has a positive effect on visual motor and motor function of ADHD children.

• Proceedings of the KAIS Fall Conference
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• 2010.11b
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• pp.1044-1047
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• 2010

개인화는 사용자에게 개인의 필요와 목적, 지식, 흥미 또는 상황에 맞는 상품과 서비스 그리고 정보를 제공한다. 개인화 서비스의 과정을 통하여 개인 사용자는 자동적으로 선별된 정보만을 제공받음으로써 정보화 사회의 정보과잉 문제를 완화하고, 시간의 절약을 가져올 수 있다. 본 연구에서는 제주물산업의 주요 분야인 병입수, 기능성 주류 및 음료, 수치료 등에 적용할 수 있는 개인화 기술에 대해 연구하고 제주 맥주를 위한 개인화 시스템을 설계 및 구현하였다. 본 연구의 성과로 제주물산업을 통해 개발되는 다양한 상품과 서비스에 대해 고객 개별적인 맞춤형 서비스를 제공해 줌으로 해서 고객의 만족도를 극대화하고 제주물산업의 상품을 글로벌 브랜딩화하는데 기여할 수 있다.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• v.24 no.4
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• pp.199-206
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• 2013

Objectives : Attention-deficit hyperactivity disorder (ADHD) and Asperger's disorder (AD) in children are associated with attentional problems, impulsivity, hyperactivity, and difficulties with social interactions. Pharmacological treatment may alleviate symptoms of ADHD, but seldom solves difficulties with social interactions. Social skills training (SST) may assist in improving their social interactions. We examined the effects of SST on children's social competences, general behavior, and ADHD symptoms. Methods : Thirty four children, aged 7 to 12 years, participated in the cognitive behavioral SST program once a week at the outpatient division of child-adolescent psychiatry. SST was composed of 24 sessions (ninety minutes) for 6 months. Twenty-five children were diagnosed with ADHD, and 9 children were diagnosed with AD. Parents of the children rated Korea-Child Behavior Checklist (K-CBCL), Conner's rating scales, Korean-ADHD Rating Scale (K-ARS), Social Skill Rating System (SSRS), and Matson's Social Skill Rating Scale as an evaluation of the treatment effect, before the first session and after the final session of the training. Results : The ADHD group showed significantly increased scores of social and social competence of CBCL and SSRS. Further, scores of externalizing problems of CBCL, CRS, and ARS were significantly decreased. The Asperger's group showed significantly increased scores of social competence of CBCL, SSRS, and MESS. There was a significant difference of the improvement in CBCL's school and total behavior problem score, CRS between drug change group and no drug change group. Conclusion : The result of this study suggests that SST is effective in improving social skills for children with ADHD and AD. In addition, SST has shown its effectiveness in treating attentional problems for children with ADHD. To prove objective usefulness of SST, further studies with a more structured design and long-term duration along with a sufficient number of AD participants will be necessary.