• Journal of KIISE:Software and Applications
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• v.27 no.2
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• pp.97-107
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• 2000

Incremental learning generally reduces training time and increases the generalization of a neural network by selecting training data incrementally during the training. However, the existing methods of incremental learning repeatedly evaluate the importance of training data every time they select additional data. In this paper, an incremental learning algorithm is proposed for pattern classification problems. It evaluates the importance of each piece of data only once before starting the training. The importance of the data depends on how close they are to the decision boundary. The current paper presents an algorithm which orders the data according to their distance to the decision boundary by using clustering. Experimental results of two artificial and real world classification problems show that this proposed incremental learning method significantly reduces the size of the training set without decreasing generalization performance.

• Journal of Korea Port Economic Association
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• v.30 no.2
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• pp.1-23
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• 2014

Although 'the International Ship Registration Act' has been enacted in Korea as of 1997, its effect is still in question to make shipowners and operators flag in or reflag because of insufficient incentives for them. Therefore, 'the Special Law for Jeju Free International City' has been established and the system of 'Special Ship Registration Zone' has also been enforced. Despite this, few studies were carried out to measure the relative importance of factors for Jeju International Ship Register yet. Against this backdrop, the purposes of this study are firstly, to investigate a relative importance of Jeju International Ship Registration System using AHP(Analytic Hierarchy Process) and secondly, to compare the characteristics of Flags of Convenience(FOC) with International Ship Register(ISR) which was adopted by several Far East Asia Countries(e.g., China, Hong Kong, Chinese Taipei and Japan). Moreover, this study aims to compare FOC with ISR in terms of shipping policy, ship management, and expenses and tax policy. In this paper, the factors were constructed with four high levels consisting of twenty one low levels to evaluate Jeju International Ship Register by utilizing Expert's brainstorming and AHP. According to the results, it is critical to expand the exemption and tax-related expenses, and also manage foreign-related systems systemically. This study provides important implications to maintain the tonnage tax system for ships effectively as well as to intensify the competitiveness of Jeju International Ship Register System.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.36 no.6
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• pp.391-398
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• 2023

In this paper, a penalized maximum likelihood estimation (PMLE) method that applies a penalty to increase the accuracy of a basis-screening-based Kriging model (BSKM) is introduced. The maximum order and set of basis functions used in the BSKM are determined according to their importance. In this regard, the cross-validation error (CVE) for the basis functions is employed as an indicator of importance. When constructing the Kriging model (KM), the maximum order of basis functions is determined, the importance of each basis function is evaluated according to the corresponding maximum order, and finally the optimal set of basis functions is determined. This optimal set is created by adding basis functions one by one in order of importance until the CVE of the KM is minimized. In this process, the KM must be generated repeatedly. Simultaneously, hyper-parameters representing correlations between datasets must be calculated through the maximum likelihood evaluation method. Given that the optimal set of basis functions depends on such hyper-parameters, it has a significant impact on the accuracy of the KM. The PMLE method is applied to accurately calculate hyper-parameters. It was confirmed that the accuracy of a BSKM can be improved by applying it to Branin-Hoo problem.

• Proceedings of the ESK Conference
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• 1996.04a
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• pp.76-81
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• 1996

CFMS(Critical Function Monitering System)는 원자력발전소에서 비상시 제어실 운전원에게 원전의 안전상태에 대한 정보를 제공하는 기능을 갖는데, 원전의 안전성을 위해 인간공학적 확인 및 검증(V&V)이 요구된다. 본 연구에서는 CFMS 화면설계의 인간공학적 평가를 위하여, 원전의 안전성에 대한 평가항목들의 상대적 중요도를 구하고 최종적으로 설계의 적합성을 평 가하는 방법론을 제시하고자 한다. 본 연구에서는 CFMS 화면설계의 평가항목 및 평가기준 확립, 원전에서 인적오류발생 가능성에 대한 평가항목의 상대적 중요도 결정, 분석하고자 하는 CFMS 화면에 대한 각 평가항목들의 인간공학적 설계의 적합성 평가로구성된다. CFMS의 인간공학적 평가를 위한 방법론으로 Fuzzy Set Theory와 AHP(Analytic Hierarchical Process) 기법을 적용 한 방법론을 제시하였다. 최종적으로는 전문가의 평가를 통하여 국내 건설되는 원전의 실제적인 문제에 적용하고자 한다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.15 no.3
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• pp.45-50
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• 2001

Fuzzy theory is used to quantify some subjective criteria and consider uncertain factors for transmission line reinforcement planning in this paper. Sugeno's fuzzy integral is also used in the proposed method, because it can be easily allied to multi attribute decision making problems such as power system planning. To verify the proposed algorithm, some bode-neck lines are searched for the case that the amount of Maximal Load Supplying Capability(MLSC) is small using the results of contingency analysis for Korea Electric Power Corporation(KEPCO)'s 345[kV] transmission line in 1998. And several feasible alternatives are composed for line reinforcement which can dissolve the bottle-neck.

• Journal of the Korean Society for Library and Information Science
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• v.41 no.4
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• pp.93-111
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• 2007

The Internet is now an integral part of the everyday lives of a majority of people. Web users are becoming increasingly skeptical of the information and services offered online. They are demanding web sites that offer credible information. This study focused on what features of web sites affect the perception of web credibility. For this purpose, I took the responses from 648 people and extracted 49 factors that affect web credibility. I placed the individual factors - the specific questions asked in the survey - into one of four categories expertise. trustworthiness, ads and other and calculated the means for each of the 49 factors. As a result, 29 out of 49 factors increase the Perceptions of credibility and 20 factors decrease the web credibility. Sites with frequently update. the credentials of authors, strict content guides, search capabilities, clear connections to the real world fared good in credibility. Technical problems such as broken links, site sown, or typographical errors were rated the most negative on this scale On the other end of the scale, a domain name that ends in' .org' or' .or.kr' caused little change in perception of credibility.

• Journal of Korea Port Economic Association
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• v.25 no.4
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• pp.1-20
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• 2009

Green logistics is regarded as an inevitable global trend in the 21st century. It can be accomplished through more broad and active reverse logistics globally, resulting in use of less fossil fuels, finally reducing carbon dioxide and other pollutants. Many countries such as U.S., Japan, EU nations have already set up policies related to carbon reduction, so-called 'green policies.' This paper aims to identify evaluation criteria for logistics policies and relative importance among those criteria, especially in the field of ports and in-land hub terminals. We examined projects related to carbon reduction from domestic and foreign ports and logistics centers and found evaluation factors and assessment indicators. With pre-evaluative items and pre-assessment indicators, we have done a survey and selected evaluation factors and assessment indicators for ports and inland hub terminals in Korea. By analyzing the mutual importance of each pre-evaluative items and pre-assessment indicators related to carbon reduction policies, this research provides guidelines on selecting the key items for the propulsion of carbon reduction projects. This study shows the importance of preliminary evaluation items and indexes with AHP in evaluating carbon reduction policies and the result shows the restrictions and change in transportation and use of alternative fuels. Lastly, it provides a guideline to policy-makers and firm managers in the field of green logistics.

• Journal of the Korean Society of Food Science and Nutrition
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• v.35 no.4
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• pp.456-463
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• 2006

The purposes of this study were to extract choice attributes of bakery cafe customers and to conduct important- performance analysis (IPA) of choice attributes perceived by bakery cafe customers. The questionnaire was developed through literature review and focus group interview, and modified after pilot test. The questionnaires for main survey were distributed to 320 males and females aged 20 and over in Seoul. A total of 275 questionnaires were used for analysis (85.9%) and the statistical analyses were conducted using SPSS Win (12.0) for descriptive analyses, exploratory factor analysis, reliability analysis, and correlation analyses. The main results were as follows. 'Products', 'convenience to use', 'services and price', 'interior environments' 'brand' and 'location' dimensions were extracted as choice attributes dimensions of bakery cafe customers and customers of bakery cafe regarded 'sanitation and cleanness', 'kindness of employees', 'quality of products', 'comfortable and pleasant facilities' and 'taste of bakery products' as more important than other attributes. In addition, the results of IPA showed that marketing managers of bakery cafes should focused on the dimension of 'services and price' in the reason that this dimension was low at performance although customers regarded it very important. Overall, researchers and managers of bakery cafes should understand unique choice attributes of bakery cafe customers, and make efforts to establish marketing strategies that meet bakery cafe customers' needs.

• 한국벤처창업학회:학술대회논문집
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• 2017.11a
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• pp.139-142
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• 2017

벤처 기업의 평가와 관련되어 벤처 캐피탈리스트들의 의사결정에 대한 지금까지의 선행 연구들의 주 초점은 벤처 캐피탈의 의사 결정 과정과 이에 관련된 의사 결정 기준이지만, 연구의 또 다른 상호 보완적인 흐름은 의사 결정에 상대적인 가중치와 중요성에 영향을 주는 요인에 관한 것이다. 즉, 벤처 캐피탈리스트의 의사결정에 있어서 인적 자본 요소인 벤처 기업의 창업자 또는 창업팀의 특징이 더 중요하다는 주장과 불확실성을 특징으로 하는 제품/서비스의 특징, 시장/산업의 특징, 재정적 특징이 창업자/창업팀의 특징 보다 더 중요하다는 두 가지 관점이 선행 연구에 존재한다. 그러나 벤처 캐피탈리스트의 의사 결정에 영향을 주는 것으로 알려진 두 가지 주장은 각각 독립적으로 연구되어 왔기 때문에 창업자의 특징과 불확실성의 요소가 결합된 상호 영향이나 상대적인 중요도가 벤처개피탈의 의사결정에 어떤 영향을 주는지에 관한 연구는 거의 없다. 이러한 배경에서 본 논문의 목적은 인적 자본 이론을 도입하여 벤처 캐피탈리스트의 의사 결정에 중요한 의사 결정 기준인 창업자의 특징 중 창업자의 경험(산업 경험, 창업 경험, 경영 경험)과 불확실성으로 발생되는 요인의 상대적인 중요도에 대한 이해를 증진시키는 것이다. 본 연구에서는 창업자의 특성과 불확실성의 특성을 벤처 캐피탈리스트의 의사 결정 과정에 실험적으로 적용할 수 있는 가상의 시나리오를 기반으로 하는 컨조인트 분석법을 적용하여 창업자의 특성과 불확실성을 포함하고 있는 8가지 요인(속성)의 중요도를 연구한다.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.90-90
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• 2017

물리서식처 분석 하천에서 유량에 따른 수심, 유속, 기층 등의 물리서식처 조건의 변화가 서식처 적합도에 미치는 영향을 수치모의를 통하여 분석하는 방법이다. 기존 물리서식처 분석은 어류를 중심으로 수생태계 평가 및 생태유량산정 등의 다양한 하천관리 문제에 적용되었다. 어류의 경우 수생태계의 최상위 포식자이며 상대적으로 모니터링하기에 용이하고 수생태계에 빠르게 반응하고 이동 및 이주가 단기간에 나타나는 특징이 있다. 또한 상업 및 레크리에이션으로의 활용도가 높기 때문에 사회적인 이목이 어류로 집중되었다. 따라서 많은 연구들이 어류를 중심으로 물리서식처 분석을 실시하였으며, 저서무척추 동물에 대한 분석은 미흡한 실정이다. 저서무척추 동물은 어류의 중요한 먹이원이자 수생태계의 건강성을 나타내는 중요한 지표로 활용되고 있으므로, 수생태계의 통합 및 먹이사슬의 보존을 위하여 저서무척추 동물에 대한 물리서식처 평가는 중요하다. 이 연구의 목표는 하천에서의 저서무척추동물의 군집을 평가할 수 있는 서식처모형을 제시하는데 있다. 이를 위해 저서무척추 동물을 서식기능군에 근거한 기는무리, 붙는무리, 헤엄치는 무리, 굴파는 무리로 분류하여 서식처 적합도 지수를 제하고 보철거 사례에 적용하여 모형의 검증성을 확인하였다.