• Proceedings of the Korean Information Science Society Conference
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• 2007.10c
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• pp.46-49
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• 2007

유비쿼터스 컴퓨팅 환경에서 사용자가 원하는 데이터를 제공하는 일은 중요한 일이다. 또한, 급격히 늘어나는 정보를 효율적으로 저장하는 것도 중요하다. 그러나 기존의 데이터 제공방식은 사용자의 의도를 파악하지 못한 단순 1차 정보 및 서비스를 제공하고 있다. 그리고 제공되는 정보의 신뢰도는 다수의 사용자가 사용하기엔 부족한 편이다. 따라서 본 논문에서는 더 효율적으로 데이터와 원하는 서비스를 제공하기 위해 키워드링크방식을 이용한 관련서비스 제공 기술을 연구한다. 세부적인 연구내용은 첫째, 데이터를 저장 시에 키워드를 하나씩 3가지로 나누어 가중키워드를 선정하여 part2에 저장시키고 상대적으로 가중치가 낮은 두 개의 키워드는 각각 part1, part3에 저장하여 가중키워드와 가중치가 낮은 키워드를 서로 링크로 연결시키고 둘째, 데이터 마이닝을 통한 정보 및 서비스를 제공할 때 검색한 데이터 외에 키워드링크방식을 통하여 관련된 데이터를 2개 이상 제공하여 다수의 사용자가 원하는 정보 및 서비스를 제공한다. 따라서 본 논문에서는 사용자의 정보를 좀 더 효과적으로 저장하고, 데이터 마이닝 할 수 있는 방법을 제안하고 있다.

• Proceedings of the Korea Inteligent Information System Society Conference
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• 2005.05a
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• pp.240-249
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• 2005

사용자 맞춤 서비스를 위하여 온라인상에서 사용자의 관심 분야를 파악하고자 하는 경우에는 적은 수의 훈련 예제로 효율적인 학습이 가능한 능동적 학습이 적절하다. 능동적 학습을 효과적으로 적용하기 위하여 사용자에게 문의할 가치가 높은 예제를 선정하는 것도 중요하지만, 사용자 편의를 위해서는 문의 횟수를 가능한 최소화하여야 한다. 문의 횟수를 줄이면서도 많은 수의 훈련 예제를 획득하기 위해서는 복수의 문의 예제들을 사용자에게 한꺼번에 제시하고 그 관심 여부를 표한하게 하는 것이 효과적이다. 본 논문에서는 능동적 학습 적용 시 사용자에게 문의할 가치가 높은 복수 문의 예제들을 효과적으로 선정하기 위하여 가중치 반영 군집화를 적용하는 방안을 제안한다. 본 제안 방안은 먼저 각 예제의 문의 예제로서의 가치를 파악하고 이를 가중치로 삼아 군집화를 수행하여 상대적으로 유사한 예제들의 집합을 구성한다. 이어서 생성된 각각의 군집에서 가장 보편적인 예제를 문의 예제로 선정하면 선정된 각각의 문의 예지는 문의할 가치가 높으면서 함께 문의하게 될 예제들은 서로 충분히 달라 학습에 보다 유용하게 사용할 수 있는 훈련 예제들을 얻을 수 있다. 문서 분류 문제를 대상으로 본 제안 방안을 실험한 결과, 단순히 문의 가치가 높은 복수의 예제들을 함께 문의할 예제들로 선정하는 방안에 비해 학습 성능이 뛰어났으며, 한 번에 문의하는 예제 수를 증가시키더라도 분류기의 성능 저하가 적음을 확인하였다.

• Journal of KIISE:Computer Systems and Theory
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• v.27 no.7
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• pp.629-638
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• 2000

The main difference between mono-volume rendering and multi-volume rendering is data intermixing. In this paper, we first propose a selective rendering method for fast visualizing specific volume according to the surface level and then present data intermixing method for multiple volumes. The selective rendering method is to generate distance transformed volume using a distance transform to determine the minimum distance to the nearest interesting part and then render it. The data intermixing method for multiple volumes is to combine several volumes using intensity weighted intermixing method, opacity weighted intermixing method, opacity weighted intermixing method with depth information and then render it. We show the results of selective rendering of left ventricle and right ventricle generated from EBCT cardiac images and of data intermixing for combining original volume and left ventricular volume or right ventricular volume. Our method offers a visualization technique of specific volume according to the surface level and an acceleration technique using a distance transformed volume and the effective visual output and relation of multiple images using three different intermixing methods in three-dimensional space.

• Journal of the Korean Society for Library and Information Science
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• v.47 no.4
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• pp.335-361
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• 2013

This study tries to develop the so-called LCSI (Library Customer Satisfaction Index) Lite for public library which can be used easily in the fields as a simplified model. Its conceptual model is developed from the former research about library service quality and customer satisfaction. Based on the analyses on the twenty Delphi-type AHP questionnaires both from the library researchers and from the public library practitioners, and on the analysis and testing of the structural equation model using the data from the more than 800 user questionnaires, it suggests a model which consists of total 15 items - namely 8 items for service quality (2 for personnel, 4 for library resources and services, 2 for facilities and environment), 3 items for customer satisfaction, and 2 items for loyalty. Library Satisfaction Index for public library will be calculated by the sum total of service quality (50%), customer satisfaction (40%), and loyalty (10%).

• Journal of Korean Society of Transportation
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• v.27 no.3
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• pp.17-28
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• 2009

To analyze the risk according to accident types by novice and experienced drivers, it is used the accidents data which occurred for 2 years(2005~2006) in Korea. It is defined that novice driver is a people who is not passed 1 year after getting a driving licence and experienced driver is a people who is passed 1 year in this study. It is used a risk model to compare and analyze about the risk between two groups. The risk model is developed to apply together two variables which is accidents frequency and severity. Then it is used a conceptual weight to find that proper rate between accident frequency and fatal accident frequency. It is found a weight($\omega=0.6$) to suitable value to apply a risk model. The results showed that collision with obstacles, angle collision($90^{\circ}$) types to novice driver group have bigger risk than experienced driver group.

• Journal of Energy Engineering
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• v.15 no.1 s.45
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• pp.74-81
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• 2006

In this study, on the basis of an analytic hierarchy process (AHP) method and through a questionnaire on subjective preference and importance, various power supply systems were comprehensively compared with multiple decision criteria such as environmental, social, healthy, and economic viewpoints and then overall priority was assessed. When a decision-making problem is modelled by a hierarchy structure, the AHP method is regarded as a useful tool for extracting subjective opinions via the aforementioned questionnaire. Here, the overall preferences were obtained by linearly aggregating weighting vector and preference matrix. The energy systems such as nuclear, coal, and LNG power plants were selected because they took share over 90% of domestic electricity supply in Korea. Furthermore, wind power and photovoltaic solar systems were included as representative renewable energy systems in Korea. According to the results of this demonstration study, the following comprehensive comparison indicators were yielded: 1) weighting factors for 4 types of main criteria as well as for 11 types of sub-criteria; 2) preference valuation for 7 types of energy systems under consideration; 3) overall score for each energy systems.

• The Journal of the Korea Contents Association
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• v.20 no.10
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• pp.45-56
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• 2020

This study is about the scale to evaluate the data of the countermeasures in the 'simulation based government exercise' (tentative name). The criteria and weighting of the scale is a standard for evaluating the data of each agency input. This maintains the objectivity and consistency of the evaluation, which complements the subjective evaluation of the observer. Therefore, the criteria should accommodate the purpose of the government exercise evaluation, the possibility of measurement in the simulation environment, the objectivity, no-duplication and causality between criteria, and the grade applying the evaluation results, and the weighting should be set. In this study, three major criteria of timeliness, accuracy, and appropriateness is set up for the evaluation scale and it consists of sub-criteria classified into three classes below respectively and the concept of it was defined. The weighting was calculated by AHP analysis considering the hierarchical structure of it. When this evaluation scale is applied to the 'simulation based government exercise' in the future, it will be possible to secure consistency and objectivity of the evaluation of measures by integrating the quantified evaluation into the observation evaluation and to conduct AAR by scientific techniques.

• Journal of the Korean Data and Information Science Society
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• v.21 no.4
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• pp.669-679
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• 2010

A sample survey design is suggested for the service satisfaction evaluation of regional education offices based on the sample size of 2009 Gyeongnam regional education offices's customer satisfaction survey. The sample design is developed to fit the goal of evaluation of individual regional offices and allocate at least the minimum sample size to each city or county in Gyeongnam to achieve the goal of the survey. The population is stratified according to the regions and the types of schools, and the sample of schools is selected with proportional to the size of classes within each stratum. Finally, each sample student is selected according to two-stage cluster sampling within each sample school. Weighting averages, weighting totals and so on can be evaluated for analysis purposes. Their variance estimates can be evaluated using re-sampling methods like BBR, Jackknife, linearization-substitution methods, which are generally used for the data from a complex sample.

• Journal of KIISE:Software and Applications
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• v.32 no.10
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• pp.974-983
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• 2005

In genetic algorithms with lotus-based encoding, static gene reordering is to locate the highly related genes closely together. It helps the genetic algorithms to create and preserve the schema of high-quality effectively. In this paper, we propose a static reordering framework for linear locus-based encoding. It differs from existing reorderings in that it is independent of problem-specific knowledge. It makes a complete graph where weights represent the interelationship between each pair of genes. And, it transforms the graph into a unweighted sparse graph by choosing the edges having relatively high weight. It finds a gene reordering by graph search method. Through the wide experiments about several problems, the method proposed in this paper shows significant performance improvement as compared with the genetic algorithm that does not rearrange genes.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.3B
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• pp.440-452
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• 2010

For an evaluation of the software product, the national/international organizations and labs have been studying various methodologies for the quality on the basis of ISO/IEC Quality Assurance System, but they still have many issues in evaluation of the anti-virus software that has special characteristics of complexity. In this paper, to establish a methodology of the quality evaluation for the anti-virus software, fulfilling the requirements more than reasonable level, a process to draw the evaluation items and quantification was established. And the information of weight was objectified by analyzing the relative magnitude between each factors. Based on the defined information (evaluation item, weight), conducting the quality evaluations for 70 kinds of open anti-virus software collected from the portal sites in the real test environment, and as a result of the positive analysis with user's long-term experience, this paper justifies the evaluation item and the weight.