• 한국과학교육학회지
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• 제15권1호
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• pp.27-38
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• 1995

The purposes of the 'Students' Science Inquiry Experiment Tournament' which is one of the 'Students' Science Inquiry Olympic Tournaments' are; 1) cultivate students' intellectual interests, inquiry abilities, and scientific attitude dealing with students' scientific reasoning abilities, problem solving abilities, and experimental apparatuses operation abilities. 2) contribute substantiality of science education through experimental inquiry learning. 3) make the ground of basic science development of the future society by selecting excellent students who have talents for science. 4) elevate science teachers' morale by this tournament. The test items set and evaluation results of the tournament were analysed in this study. The results of this study were ; 1) the discrimination ability of the paper-and pencils test and the experiments were low because the students' scores of the items were not normally distributed and standard deviations were very small values. 2) most of the tournament participation students did not answered to the subjective type test items. 3) according to the responses of the tournament participation students, the tournament contribute to the students' interests in science. But the opinion was dominant that the tournament didn't contribute to school science education improvement.

• 말소리와 음성과학
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• 제7권1호
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• pp.3-10
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• 2015

In this paper, different frequency scales in cepstral feature extraction are evaluated for the text-independent speaker recognition. To this end, mel-frequency cepstral coefficients (MFCCs), linear frequency cepstral coefficients (LFCCs), and bilinear warped frequency cepstral coefficients (BWFCCs) are applied to the speaker recognition experiment. In addition, the spectro-temporal features extracted by the cepstral-time matrix (CTM) are examined as an alternative to the delta and delta-delta features. Experiments on the NIST speaker recognition evaluation (SRE) 2004 task are carried out using the Gaussian mixture model-universal background model (GMM-UBM) method and the joint factor analysis (JFA) method, both based on the ALIZE 3.0 toolkit. Experimental results using both the methods show that BWFCC with appropriate warping factor yields better performance than MFCC and LFCC. It is also shown that the feature set including the spectro-temporal information based on the CTM outperforms the conventional feature set including the delta and delta-delta features.

• 한국전자거래학회지
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• 제8권2호
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• pp.23-31
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• 2003

링크 기반 검색엔진은사용자의 질의어와 관련된 웹 문서들의 링크 정보를 이용하여 순위를 생성한다. 이러한 링크기반 웹 문서의 특성을 이용한 대표적인 순위 평가 알고리즘. HITS는 웹 페이지들 간의 상호 연결된 링크 정보로부터 웹 문서들의 중요도를 평가하고, 순위 정보에 따른 결과를 제시한다. 이러한 HITS 알고리즘의 문제점은 문서 내의 링크 빈도 수만을 고려하고, 입력 값으로 주어지는 웹 문서 집합의 특성에 의존적이라는 것이다. 본 논문에서는 링크기반 웹 검색 엔진들로부터 얻어진 문서 집합에 대해 질의와 검색결과 간의 적합도를 향상시킨 HITS 알고리즘을 수행하는 검색 에이전트를 설계하였다. 이로써 향상된 검객 성능과 결과의 지역성을 보완한다.

• 한국통신학회논문지
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• 제13권5호
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• pp.379-389
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• 1988

본 논문에서는 통신방의 2-상태 스취칭 실패함수를 구하기 위한 알고리즘과 단섭간 신뢰도 계성방법을 제시하였다. 통신망을 그래프로 모형화하고, 이 그래프에 대한 일련의 행열변환을 함으로서 모든 통신통로를 차단하는 최초컷-\ulcornerV 행열을 구하였으며 최소 컷-\ulcornerV행열로부터 2-상태 스위칭 실패함수를 구하였다. 또한 2-상태 스위칭 실패함수에 확률변수를 대응시켜 통신망의 단점간 신뢰도를 계정하였다. 제안된 알고리즘을 설명하기 위하여 몇가지 예를 보였으며 복잡하고 규모가 큰 망에 대한 단점간 신뢰도를 계정하기 위해서 전산기 프로그램을 제시하였다.

• 한국안전학회지
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• 제3권2호
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• pp.5-16
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• 1988

This study is conducted to evaluate the explosion of tolune storage tank in the petrochemical plant by Fault Tree Analysis. The conclusions are as follows; 1) Fault Tree diagram and the required computer program for evaluation of explosion accident is developed. 2) The probability of the top event, explosion accident, is $1.5\;{\times}\;10^{-8}$ per year, so there is almost no possibility of explosion during the life cycle of tank. However, the probability of Gate 6 and Gate 7 is 8.8 per month, therefore, attention should be paid to them for accident prevention. 3) The number of minimal cut sets is 67 sets which are not calculated the probability of each set, because of the lack of computer capacity. All the minimal cut sets should be examined case by case. However, it is necessary to be paid attention to COM1, 126, 131, and COM4 in minimal cut sets, because the number of appearance is so high. 4) The number path sets is 70 sets which are not calculated the probability of each set, because of the lack of computer capacity. It is very useful to prepare safety checklist by using this minimal path sets. Also, the events which appear many times, 123, COM5, 139, 127 and 128, are very high in reliability.

• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 2003년도 춘계학술대회
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• pp.214-225
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• 2003

Now a day, the company must strengthen the contact-point of the customer who the company has and has to block the secession of the customer by providing services or goods on time. Under this market situation, the corporation extends the CRM for the customer management and strategic management, and set the CRM-strategies up for managing the customer relationship. For this, the present enterprise's level and the business-ability for the management of the customer relationship should be considered. Therefore, in this study, we will analyze the critical factors to set the CRM up as a strategy by studying the literature review. In the critical factors, the factors of enterprise level as well as the technical factor will be included. Secondly, as you know, the BSC is used to evaluate the corporation as a index. In this study the BSC model is changed and rearranged for the applied BSC model to measure the C3M level of companies. Thirdly, based on the model developed, the factors in the first step are classified by levels and weighted values are calculated by using AHP method. As a result, we will show the diagnostic model for check the operational performance of management, marketing and sales etc.

• 한국지능시스템학회논문지
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• 제16권6호
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• pp.653-658
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• 2006

신뢰는 다른 상대가 특정한 행동을 할 것이라고 믿는 정도를 나타내는 주관적인 확률값으로 정의할 수 있다. 본 논문에서는 신뢰값을 결정하는 데서 고려되는 기질신뢰, 일반신뢰, 상황신뢰를 모두 고려하고, 또한 상대에 대한 명성정보를 이용하는 종합적인 퍼지 신뢰모델을 제안한다. 제안한 모델은 거래에 대한 평가결과들에 대해서 만족하는 정도를 퍼지집합으로 나타내고 평가 항목에 대한 중요도를 ${\lambda}$-퍼지측도의 성질을 만족하도록 설정하고, 평가항목별 만족정도를 Sugeno 퍼지적분을 이용하여 결합하는 방법을 사용한다.

• Journal of the Optical Society of Korea
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• 제15권1호
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• pp.30-37
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• 2011

Binocular-pair images obtained from two cameras can be used to calculate the three-dimensional (3D) world coordinate of a feature point. However, to apply this method, measurement accuracy of binocular vision depends on some structure factors. This paper presents an experimental study of measurement distance, baseline distance, and baseline direction. Their effects on camera reconstruction accuracy are investigated. The testing set for the binocular model consists of a series of feature points in stereo-pair images and corresponding 3D world coordinates. This paper discusses a method to increase the baseline distance of two cameras for enhancing the accuracy of a binocular vision system. Moreover, there is an inflexion point of the value and distribution of measurement errors when the baseline distance is increased. The accuracy benefit from increasing the baseline distance is not obvious, since the baseline distance exceeds 1000 mm in this experiment. Furthermore, it is observed that the direction errors deduced from the set-up are lower when the main measurement direction is similar to the baseline direction.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권11호
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• pp.3935-3949
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• 2021

With the rapid development of Internet and big data technology, various online social network platforms have been established, producing massive information every day. Hot topic discovery aims to dig out meaningful content that users commonly concern about from the massive information on the Internet. Most of the existing hot topic discovery methods focus on a single network data source, and can hardly grasp hot spots as a whole, nor meet the challenges of text sparsity and topic hotness evaluation in cross-network scenarios. This paper proposes a novel hot topic discovery method across social network based on an im-proved LDA model, which first integrates the text information from multiple social network platforms into a unified data set, then obtains the potential topic distribution in the text through the improved LDA model. Finally, it adopts a heat evaluation method based on the word frequency of topic label words to take the latent topic with the highest heat value as a hot topic. This paper obtains data from the online social networks and constructs a cross-network topic discovery data set. The experimental results demonstrate the superiority of the proposed method compared to baseline methods.

• 자동차안전학회지
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• 제10권4호
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• pp.54-59
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• 2018

While the advanced trffic environment systems are developed recently, the traffic systems for transportation vulnerable are still under development and their social life are limited as well. In order to the secure their mobility rights, it had been required to set up the particular system for the traffic welfare. One of the significant items is the express bus operation for wheelchair users. Thus, the research of development and operation for express buses with wheelchair users was funded by the Korean government. Before the express bus development for wheelchair users based on the current bus model, this study set up the evaluation method for the bus rollover characteristics to ensure occupant safety using the finite element method. The partial bus model was developed corresponding to the full bus model response under rollover event and the evaluation method based on two model (full bus model and partial bus model) responses is planned to apply the model development of express bus modification for wheelchair users.