• Journal of the Korean Regional Science Association
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• v.37 no.2
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• pp.63-82
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• 2021

This study aims to explore how manufacturing start-up activities from 2000 to 2018 have changed spatially and to predict changes in distribution patterns of future start-up activities. For the analysis, the Census on Establishments microdata from 2000 to 2018 were used, and the manufacturing industry was classified into four detailed industrial groups according to the 40 manufacturing standards presented by the Korea Institute for Industrial Economics and Trade's ISTANS. According to the results, start-up activities in industries that require high technology levels are concentrated in southern Gyeonggi region, and other start-up activities are concentrated outside of the metropolitan area. When the distribution change from 2018 to 2036, extending the trend from 2000 to 2018, it was confirmed that there was a high possibility of a rise in the hierarchy in the future in regions adjacent to regions where start-up activities occur. This study aimed to provide implications for regional policies related to fostering start-ups and creating jobs by dynamically analyzing the location pattern of manufacturing start-ups, which is a major source of job creation.

• Journal of Korean Library and Information Science Society
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• v.53 no.2
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• pp.165-188
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• 2022

The purpose of this research is to document the current state of 'One Book, One City' community reading campaign (Hereafter called 'One Book' reading campaign), launched in 2003 in Korea, and the characteristics of the selected books. For this research, the homepages, news and reports of a total of 1,170 public libraries and their local government, and several major institutions and organizations related to reading and culture were analyzed with the research method of content analysis and literature review. Also, online catalogs of the National Library of Korea and the National Library for Children and Young Adults were examined to identify the characteristics of 729 titles and 1,179 volumes of books selected in 57 'One Book' programs, as of 2021. The analysis of 57 'One Book' programs and those selected books shows the selection of more than one books in different age groups in more and more 'One Book' programs, lack of consistency in themes of those selected books, and preference for young adult books, new publications and bestselling novels. This trend has weakened individual 'One Book' programs' concentration on one book or one subject, but helped invite a diverse group of people with various interests. More in-depth analysis and explanation of the process of book selection and its appropriateness with the stated goals of 'One Book' programs are needed.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.1D
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• pp.33-40
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• 2009

The critical lag of crosswalk pedestrians is an important parameter in analyzing traffic operation at unsignalized crosswalks, however there is few research in this field in Korea. The purpose of this study is to develop a model to estimate the critical lag. Among the elements which influence the critical lag, the age of pedestrians and the length of crosswalks, which have fuzzy characteristics, and the each lag which is rejected or accepted are collected on crosswalks of which lengths range from 3.5 m to 10.5 m. The values of the critical lag range from 2.56 sec. to 5.56 sec. The age and the length are divided to the 3 fuzzy variables each, and the critical lag of each case is estimated according to Raff's technique, so a total of 9 fuzzy rules are established. Based on the rules, an ANFIS (Adaptive Neuro-Fuzzy Inference System) model to estimate the critical lag is built. The predictability of the model is evaluated comparing the observed with the estimated critical lags by the model. Statistics of $R^2$, MAE, MSE are 0.96, 0.097, 0.015 respectively. Therefore, the model is evaluated to explain the result well. During this study, it is found that the critical lag increases rapidly over the pedestrian's age of 40 years.

• 한국노년학
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• v.29 no.3
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• pp.1159-1182
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• 2009

The purpose of this study is to examine everyday emotional experience of urban elderly in Korea. Specifically, this study explores gender differences in the effect of place/location of activity and companionship on the daily emotional experience. Data were collected from 148 urban elderly (men=76, women=72) in Seoul, using Experience Sampling Method(ESM). The unit of analysis was the self-report and in total 5,530 self-reports were provided. The statistical methods used for the data analyses were descriptive statistics, t-test, χ² verification, and ANOVA. The major findings are as follows. First, the elderly in Korea spend a quite substantial portion of their time at home, and they spend the largest share of their time in company with their spouse. Second, women report higher intensity of stress and irritation than men in terms of overall emotional experience. Third, the effect of activity location and companionship on emotional experience turned out to be different depending on gender. Emotional experience of daily lives and overall quality of life are shown to be inter-related. Based on these findings, this study provides a significant implication that situational contexts of experience should be considered in order to understand the daily emotional experience of the contemporary Korean elderly.

• Journal of KIISE:Information Networking
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• v.32 no.3
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• pp.279-290
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• 2005

Recently, as the serious damage caused by DDoS attacks increases, the rapid detection and the proper response mechanisms are urgent. However, existing security mechanisms do not effectively defend against these attacks, or the defense capability of some mechanisms is only limited to specific DDoS attacks. In this paper, we propose a detection architecture against DDoS attack using data mining technology that can classify the latest types of DDoS attack, and can detect the modification of existing attacks as well as the novel attacks. This architecture consists of a Misuse Detection Module modeling to classify the existing attacks, and an Anomaly Detection Module modeling to detect the novel attacks. And it utilizes the off-line generated models in order to detect the DDoS attack using the real-time traffic. We gathered the NetFlow data generated at an access router of our network in order to model the real network traffic and test it. The NetFlow provides the useful flow-based statistical information without tremendous preprocessing. Also, we mounted the well-known DDoS attack tools to gather the attack traffic. And then, our experimental results show that our approach can provide the outstanding performance against existing attacks, and provide the possibility of detection against the novel attack.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2009.04a
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• pp.80-83
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• 2009

최근 국내 산업구조 및 생활환경의 변화로 도시구조의 고도화, 집중화로 인해 특정관리대상건축물이 다양화됨으로써 안전사고 및 재해양상이 점차 다변화 되어 증가되고 있다. 이에 따라 우리나라 정부에서는 관련 법령에 근거하여 지자체 및 재난관리책임기관 등에서 시설물의 안전관리를 수행하고 있다. 1995년 제정된 "시설물의 안전관리에 관한 특별법"에 근거하여 일정 규모 이상의 1종 및 2종 시설물을 대상으로 정기점검, 정밀점검, 정밀안전진단이 관련전문가에 의하여 주기적으로 수행되고 있으며, "재난 및 안전관리 기본법"에 의하여 특정관리대상시설을 지정하여 주기적인 안전점검이 수행되고 있다. 그러나 수작업에 의한 안전관리 업무 수행과 점검 및 진단 결과에 대한 사후 관리로 관계 업무 주체들에게 과다한 업무가 부과되면서도 안전관리가 효율적 효과적으로 이루어지고 있지 못한 상황이다. 또한 관련 업무가 서로 다른 법령 및 기관에 분산되어 업무의 비효율성을 야기하고 있다. 이에 본 연구는 특정관리대상 건축물의 효율적인 안전관리를 위해 안전관리 업무의 정형화, 안전관리 정보의 통합관리 및 현실적인 업무환경을 고려한 안전관리시스템의 개발을 목적으로 수행되었다.

• Journal of the Korean Data and Information Science Society
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• v.8 no.2
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• pp.183-194
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• 1997

In accelerated life tests, the failure time of an item is observed under a high stress level and based on the time, the failure rates of items we estimated at the normal stress level. In this paper, when the mean of the prior distribution of a parameter is known in Weibull lifetime model with censored failure time data, we study various estimating methods to obtain the empirical Bayes estimator of a parameter from the empirical Bayes approach under the normal stress level by considering the fact that the Bayes estimator is the function of prior parameters and of the acceleration parameter representing the effect of acceleration. And we compare the performance of several empirical Bayes estimators of a parameter in terms of the Bayes risk.

• The Journal of the Korea institute of electronic communication sciences
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• v.7 no.5
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• pp.1109-1115
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• 2012

The housing redevelopment goes on smoothly, because it has problem that prevent theory and alternative policy. The conflict factors may remove to the problem before. This study has proposed that is universally applicable to the housing redevelopment and the conflict factors was supplied effective use of resources. This paper get the conclusion as a survey. first, It have a conflict solution for successful housing redevelopment business. Second, reconstruction business process categorized four stage. Third, It suggest an alternative about reconstruction business manage and systematization.

• Journal of the Korean Society for Railway
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• v.13 no.1
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• pp.125-130
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• 2010

The government makes an effort to disperse the centralization of Seoul through the its surroundings development for relieving the various social problems caused by the capital region concentration. But, the planless rail system development in the capital region have made it difficult to approach into Seoul city center from its surroundings. Through Seoul metro line 9, constructed by private company first in Korea, that has operation plan with normal and express train together, we would like to study up on promotion of passenger service quality such as "the improvement of the accessibility to Seoul city center from its surroundings" and "service of various pattern of trains".

• Proceedings of the KSR Conference
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• 2009.05a
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• pp.1383-1389
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• 2009

This paper describes an Energy Efficient Timetabling Problem(EETP). In these days, the researches on development of an energy efficient railway systems are highlighted over the world. The departures occurred in an electrical power feeding circuit at the same time are necessary to be reduced as far as possible, to minimize the energy consumption. The paper addresses the operational requirements and facility restrictions to construct a mathematical model for EETP. In addition, it suggests several types of objectives for the model.