• 한국콘텐츠학회논문지
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• 제17권11호
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• pp.192-199
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• 2017

본 논문의 목적은 지난 2010년 이후 우리의 수출 대상인 아시아, 북미, 유럽, 중남미, 중동, 아프리카를 중심으로 수출액의 상승률 동향과 변동성 그리고 상관관계와 모형분석 등을 살펴보고 향후 성장 방향을 찾아보는데 있다. 분석 결과 아시아, 북미, 유럽, 중남미, 중동, 아프리카 순으로 높은 수출 비중을 보여주었으며 수출액 상승률은 아시아, 북미, 유럽이 상대적으로 높게 나타났고 전윌대비 변동률은 아시아와 북미가 안정된 움직임을 보여주었다. 이 연구를 통해 우리의 수출액을 증가시키기 위해서는 아시아, 북미, 유럽으로의 수출 향상에 많은 관심을 보여야 할 것이다. 특히 50%가 넘는 아시아 즉, 중국, 일본, 베트남, 홍콩, 대만, 인도 등으로 수출 향상과 수출전략 방안이 필요해 보인다. 아직은 수출 비중이 크지 않지만 향후 중남미, 중동, 아프리카 등의 신시장 개척에도 많은 관심을 가지고 수출향상방안이 체계적으로 진행되기를 기대해 본다.

• 인터넷정보학회논문지
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• 제3권6호
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• pp.43-51
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• 2002

본 논문은 능동적인 큐 관리를 이용한 새로운 패킷 탈락 알고리즘에 대해 연구이다. 능동적인 큐 관리 기법은 기존의 Drop Tail과 다른데, Drop Toil은 버퍼 오버플로우가 발생하면 패킷 탈락되는 반면, 능동적인 큐 관리 기법인 RED는 폭주가 발생하기 전에 패킷이 탈락된다는 것이다. 그러나 능동적인 큐 관리 기법은 버퍼 크기가 충분히 크지 않을 때 높은 패킷 손실률을 초래한다. 폭주를 탐지하고 무작위로 선택된 연결에 이를 통보함에 의한 글로벌 동기화와 공정성 문제를 야기하며, 최적의 평균 큐 길이를 찾기 위해서는 네트워크 트래픽 특성이 미리 알려져야 한다는 커다란 문제가 있다. 본 논문에서는 폭주제어를 위한 새로운 큐 관리 기법 기반의 효율적인 패킷 탈락 기법을 제안한다. 제안된 기법은 플로우별 도착률과 추정된 공정한 대역을 사용한다. 이를 이용하여 플로우 도착률과 링크 대역을 계산하기 위한 추정 알고리즘을 제안한다. 제안된 기법은 패킷 손실을 가져오는 패킷에 의한 큐 길이의 급속한 진동을 초래하지 않기 때문에 네트워크 성능을 향상시킬 수 있음을 보인다.

• 대한약리학회지
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• 제11권2호
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• pp.19-27
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• 1975

Haloperidol, a butyrophenone, was synthetized by Janssen and introduced for the treatment of psychosis. Although structurally different from the phenothiazines, the butyrophenones share many of their pharmacological properties, such as inhibition of conditioned avoidance response, blocking effect of amphetamine reaction, producing catalepsy, antishock effect and protection against the lethal effects of catecholalmines. Chlorpromazine can lower the arterial blood pressure through its adrenergic blocking activity, its direct effect in relaxing vascular smooth muscle, its direct effect in depressing the myocardium and its action in a complex manner on the central nervous system. In the case of haloperidol, however, was not clarified the mechanism of lowering the blood pressure. The present paper describes the effects of haloperidol on cardiovascular system to investigate the mechanisms of its actions on the arterial blood pressure. The results are followings; 1. In anesthetized cats, intravenous administration of haloperidol and chlorpromazine in the dose of 0.1mg/kg produced a slight decrease in the blood pressure, which followed by complete recovery within $30{\sim}60$ minutes. In the dose of 3mg/kg, however, both produced an abrupt and marked decrease of the blood pressure, which followed by delayed recovery. 2. Haloperidol in the dose ranges of 0.1mg to 3.0mg/kg tended to produce the heart rate slowing in the cats, while chlorpromazine has no effect on the rate. 3. Following administration of haloperidol or chlorpromazine, epinephrine reversal in the arterial blood pressure was observed in the cat, however the responses of norepinephrine and acetylcholine were little affected. 4. In the isolated rabbit atrium the contractility was depressed by haloperidol in the doses over 0.5mg per 100ml, but the rate was not affected. In contrast, the epinephrine-induced contractility was not depressed after haloperidol treatment. However, the increased rate of atrium by epinephrine was partially blocked after haloperidol. 5. In the isolated rabbit aortic strip, epinephrine-induced contraction was blocked by haloperidol. With the above results, it may be concluded that the hypotensive effect of haloperidol was largely due to ${\alpha}$-adrenergic blocking properties and the direct effect in depressing the myocardium as well as its action on central nervous system.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제6권1호
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• pp.103-112
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• 2000

지능망과 이동 통신 시장의 활성화로 차세대 지능망 서비스를 구현함에 있어 이동 서비스 가입자 및 이동 서비스 이용자 등의 서비스 수요가 더욱 증가될 것이 고려되어야 한다. 따라서, 본 논문에서는 가장 많이 사용되는 지능망 서비스중의 하나인 착신 과금 서비스에 대량호를 처리할 수 있는 호 대기 기능을 추가하여 호 성공률을 높이고, 서비스 가입자의 범위를 기존의 유선망 가입자뿐만 아니라 이동 단말을 소유한 무선망 가입자까지 확장하여 가입자의 이동성을 고려한 Global Service Logic을 설계한다. 또한 서비스에 가입된 각 가입자 단말기들의 위치 정보를 관리하여, 그들의 이동에 따른 동적 그룹핑을 수행하는 Queue Manager의 구조 및 동작 메커니즘을 설계하며, 호 시도율과 drop rate에 따라 필요한 큐의 적정 크기와 이에 대한 큐에서의 대기 시간을 제시한다.

• STI Policy Review
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• 제8권2호
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• pp.75-93
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• 2017

Recently, global competition in the manufacturing sector is driving firms in the manufacturing sector to conduct product innovation projects to maintain their competitive edge. The key points of product innovation projects are 1) what the purpose of the project is and 2) what expected results in the target market can be achieved by implementing the innovation. Therefore, this study focuses on the performance of innovation projects with a business viewpoint. In this respect, this study proposes the "achievement rate" of product innovation projects as a measurement of project performance. Then, this study finds the best strategies from various innovation activities to optimize the achievement rate of product innovation projects. There are three major innovation activities for the projects, including three types of R&D activities: Internal, joint and external R&D, and five types of non-R&D activities - acquisition of machines, equipment and software, purchasing external knowledge, job education and training, market research and design. This study applies decision tree modeling, a kind of data-mining methodology, to explore effective innovation activities. This study employs the data from the 'Korean Innovation Survey (KIS) 2014: Manufacturing Sector.' The KIS 2014 gathered information about innovation activities in the manufacturing sector over three years (2011-2013). This study gives some practical implication for managing the activities. First, innovation activities that increased the achievement rate of product diversification projects included a combination of market research, new product design, and job training. Second, our results show that a combination of internal R&D, job training and training, and market research increases the project achievement most for the replacement of outdated products. Third, new market creation or extension of market share indicates that launching replacement products and continuously upgrading products are most important.

• 한국ITS학회 논문지
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• 제20권4호
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• pp.13-27
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• 2021

본 연구에서는 영동고속도로 용인IC~양지IC구간을 대상으로 2020년 데이터를 활용하여 자율주행자동차의 시장점유율 변화가 교통류에 미치는 영향을 추정하였다. 교통류에 미치는 영향 정도를 추정하기 위해 미시교통시뮬레이션 모형인 VISSIM을 활용하였다. 자율주행자동차의 종방향 제어를 반영하기 위해서 intelligent driver model(IDM)을 구축 후 VISSIM에 적용하여 일반차와 비교를 수행하고 주행행태를 검증하였다. 자율주행자동차의 시장점유율에 따른 이동성 및 안전성 분석 결과, 자율주행자동차 도입 시 시장점유율이 높아질수록 네트워크의 이동성은 향상되지만, 안전성의 경우 차종이 혼재되었을 때 교통류가 불안정해지므로 더욱 안전 관리에 집중해야 한다는 것을 확인하였다.

• International Journal of Air-Conditioning and Refrigeration
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• 제12권1호
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• pp.10-20
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• 2004

Experiments have been conducted in order to make comparisons of characteristics of a R410a cycle with a R22 cycle in terms of cooling capacity and coefficient of performance (COP). The parameters examined in the present work include air flow rate, indoor and outdoor air temperatures, and indoor relative humidity. These two refrigeration cycles constructed for this study share all components except compressor, accumulator, oil separator, and piping. The measurements were made using a psychrometric calorimeter. The experimental results show that the R410A cycle has several advantages for indoor units while the R22 cycle yields better performance for outdoor units.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2012년도 추계 학술논문 발표대회
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• pp.277-278
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• 2012

After the introduction of CM(construction management) for improving productability in construction industry, the CM market was shown to actively grow shape until 2007 but suddenly appears passive movement of the market after in 2008. However, on one hand, the CM corporations has increased, because the construction supervision market come to the CM market area by reduction their work place. Because of this, it was discussed that will intensify competition between companies in the CM market. Therefore, this paper want to analyze to status of the CM market structure for studying about the CM industry status and change during last 3 years. As a result, by decreasing the Market concentration, the CM market competition rate did not too high with business despite that CM market downsize and has been increased the number of companies.

• 디지털산업정보학회논문지
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• 제5권2호
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• pp.39-49
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• 2009

In this paper, we classify web-based social network into two types: open and community, and model user behavior in social activities. After that, we also propose the combination of instant messaging and web system as the method of support asynchronous/synchronous social activities. Furthermore, we introduce ImCoWeb prototype system that supports both asynchronous social activities (ex. social bookmark, comment, rate, and data share) and synchronous ones (ex. real-time communication, file transfer, co-browsing, and co-work). Because it is built on the existing instant messaging, it reduces costs by reusing the facilities such as session management, user management, and security of instant messaging.

• Journal of Life Science
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• 제11권1호
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• pp.34-38
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• 2001

The cDNA encoding ribosomal protein S4(RPS 4) from an ovary cDNA library of the Japanese monkey (Macaca fuscata) was cloned and sequenced. The RPS4X gene from monkey X chromosome encodes a deduced protein of 263 amino acids and share 99.1% cDNA sequence similarity and 100% amino acid sequence identify with the human RPS4X. Rate of synonymous substitution was higher in RPS4Y than in RPS4X in comparison to the monkey and human. The ratio of synonymous and nonsynonymous substitutions per site indicated that directional selection has nor occurred in RPS4 genes. Phylogenetic analysis using the neighbor-joining method revealed that X and Y-linked RPS4 genes have evolved independently.