• 한국컴퓨터정보학회논문지
• /
• 제22권3호
• /
• pp.123-129
• /
• 2017

This study intends examine the relevance of factors with negative influences on anti-social sexual awareness formation in adolescents as per the concern of the parents of families with adolescents, as internet pornography exposure in adolescents lead to excessive indulgence in pornographic photographs, cartoons, videos, or fictions, or in video chatting with exposure of one's own body parts. For this, the factors of internet pornography exposure in the study subjects of adolescents were constructed into a multilateral model, and the structural equation model was analyzed. As the result of the study, the following conclusion were drawn. First, the most powerful factor influencing the anti-social sexual awareness in adolescents was, contrary to the concern of many, not the exposure to pornography through internet media, but personal characteristics such as sensation-seeking tendency and socio-environmental characteristic of differential association. Second, it is worth noting that the most major factor influencing intentional internet pornography exposure by adolescents is another form of pornography exposure. Third, whether intentional or unintentional, the internet-related variable influencing the internet pornography exposure was found to be the amount of internet usage. Fourth, the unintended internet pornography exposure was found to have no direct influence on the sexual awareness of adolescents, but it did have an indirect influence on sexual awareness mediated by intentional internet pornography exposure and existing-media pornography exposure. Based on these study results, the conclusion was drawn regarding the influence of internet pornography on sexual awareness in adolescents.

• 설비공학논문집
• /
• 제25권11호
• /
• pp.631-639
• /
• 2013

This study derives quality checking items in Building Mechanical Systems Design Criteria, and suggests quality criteria to review BIM models in the duct system of an air conditioning system for rule-based automatic checking. First, components for the duct system of an air conditioning system were reviewed, and the quality checking items were drawn from Building Mechanical Systems Design Criteria, through assessment according to object, attribute and relationship composing the BIM model. Second, quality checking types were derived, by analyzing the quality checking items and Rule set of the Solibri Model Checker. Finally, methods of algorithm functioning for checking the BIM models for mechanical systems in computers were drawn, and Elements to comprise the quality checking criteria (rule) were suggested. This study means that that checking items are derived from domestic criteria, and a way for the development process of determining quality checking criteria (rules) is suggested.

• 한국정밀공학회지
• /
• 제16권12호
• /
• pp.198-203
• /
• 1999

In this study, chip-tool friction and shear characteristics of cold drawn free machining steels in turning were assessed. To do this, a newly developed equivalent oblique cutting model was adopted. And for comparison with those of free machining steels, chip-tool friction and shear characteristics of conventional carbon steels were also investigated. The Pb-S free machining steel shows superior machinability to others. In case of the Bi-S free machining steel, the shear stress and the specific friction energy are relatively lower than those of conventional carbon steels, but its shear strain is relatively high, so it does not show any remarkable improvement of machinability.

• 소성∙가공
• /
• 제13권4호
• /
• pp.307-318
• /
• 2004

Rectangular drawn case with extreme aspect ratio is widely used for electrical parts such as a lithium-ion battery container, semi-conductor case and so on. Additionally, from the recent trend towards miniaturization of the multi-functional mobile device, demands for rectangular case with the narrow width are increased. In this study, numerical and experimental approaches for the multi-stage deep drawing process have been carried out. Based on the research results of the width of 5.95mm model, finite element analysis for storage case of rectangular cup type was verified to the width of 4.95mm. Also, a series of manufacturing experiments for rectangular case is conducted and the deformed configuration of the rectangular drawn case are investigated by comparing with the results of the numerical analysis. And the modification of the initial blank is performed to minimize the trimmed material amount. By the application of the modified blank, the sound shape of the deformed parts is improved.

• 시스템엔지니어링학술지
• /
• 제11권2호
• /
• pp.75-83
• /
• 2015

This paper describes modeling & simulation(M&S) model for dynamic analysis of helicopter rotor blades. Simulation model is developed using Dymola tool which implements the open source language - Modelica. Modelica is appropriate for developing multibody dynamic analysis model. To develop an M&S model efficiently, model based systems engineering(MBSE) is applied. Some diagrams such as requirement diagram, block definition diagram and sequence diagram etc. are drawn to capture the concept of M&S model. This activity is done utilizing the open source tool - Papyrus.

• 전자공학회논문지 IE
• /
• 제48권1호
• /
• pp.36-44
• /
• 2011

본 연구는 전문대학 공학계열 학생들의 수학 기초학습능력과 문제해결능력 신장을 위한 공학수학 수업모형의 설계원리를 도출하고 개발하는 데 목적이 있다. 본 연구를 위해서 첫째, D 대학 디지털전자과의 교수 학습환경 분석과 함께 산업체 및 졸업생을 대상으로 한 요구분석을 실시하였고, 둘째, 요구분석 결과와 관련 선행연구를 바탕으로 공학수학 수강생들의 기초수학학습능력과 문제해결능력 신장을 위한 수업모형의 기반 설계이론을 도출하였다. 연구 결과, 수업모형의 기반 설계이론으로는 (1) 수학 기본개념과 반복훈련을 통해서 수학 기초학습능력을 높이고, (2) 동료 학습자간 협력적 문제해결활동을 통해서 문제해결능력을 신장하고, (3) 학습자의 성찰을 촉진하고 학습자의 수업활동에 대한 교수자의 체계적인 점검과 즉각적인 피드백을 제공하고, (4) 최근 온라인과 모바일 환경에 익숙한 학습자들이 자기주도적으로 학습할 수 있는 환경을 제공하는 것이다.

• 한국IT서비스학회지
• /
• 제15권1호
• /
• pp.153-166
• /
• 2016

Ensemble classification is an approach that combines individually trained classifiers in order to improve prediction accuracy over individual classifiers. Ensemble techniques have been shown to be very effective in improving the generalization ability of the classifier. But base classifiers need to be as accurate and diverse as possible in order to enhance the generalization abilities of an ensemble model. Bagging is one of the most popular ensemble methods. In bagging, the different training data subsets are randomly drawn with replacement from the original training dataset. Base classifiers are trained on the different bootstrap samples. In this study we proposed a new bagging variant ensemble model, Randomized Bagging (RBagging) for improving the standard bagging ensemble model. The proposed model was applied to the bankruptcy prediction problem using a real data set and the results were compared with those of the other models. The experimental results showed that the proposed model outperformed the standard bagging model.

• Journal of Communications and Networks
• /
• 제8권3호
• /
• pp.339-350
• /
• 2006

Several novel concepts and tools have revolutionized our understanding of the Internet topology. Most of the existing efforts attempt to develop accurate analytical models. In this paper, our goal is to develop an effective conceptual model: A model that can be easily drawn by hand, while at the same time, it captures significant macroscopic properties. We build the foundation for our model with two thrusts: a) We identify new topological properties and b) we provide metrics to quantify the topological importance of a node. We propose the jellyfish as a model for the inter-domain Internet topology. We show that our model captures and represents the most significant topological properties. Furthermore, we observe that the jellyfish has lasting value: It describes the topology for more than six years.

• Journal of the Korean Data and Information Science Society
• /
• 제23권4호
• /
• pp.825-832
• /
• 2012

We propose a novel way of forecasting the market shares of several brands simultaneously in a multiplicative competitive interaction model, which uses kernel regression technique incorporated with kernel machine technique applied in support vector machines and other machine learning techniques. Traditionally, the estimations of the market share attraction model are performed via a maximum likelihood estimation procedure under the assumption that the data are drawn from a normal distribution. The proposed method is shown to be a good candidate for forecasting method of the market share attraction model when normal distribution is not assumed. We apply the proposed method to forecast the market shares of 4 Korean car brands simultaneously and represent better performances than maximum likelihood estimation procedure.

• 대한공업교육학회지
• /
• 제34권2호
• /
• pp.179-204
• /
• 2009

조직구성원의 인재개발을 위한 교육훈련의 관심이 증대되면서 다양한 교육프로그램이 제공 및 보편화되고 있으며, 교육의 정당성 확보와 프로그램에 대한 지속적인 질 관리 차원에서 평가의 중요성이 부각되고 있다. 따라서 이 연구의 목적은 지식정보화 사회에서 요구되고 있는 인재개발 교육프로그램 평가준거 개발의 기초자료를 제공하는데 있으며, 국내 외 문헌고찰과 사례조사를 통하여 과정중심 평가모형인 Stufflebeam의 CIPP(Context, Input, Process, Product)모형에 기반한 인재개발 교육프로그램의 평가준거 대영역을 도출하였으며, 이에 따른 연구의 결과는 다음과 같다. 첫째, 인재개발 교육프로그램의 상황평가 대영역으로 도출한 평가영역은 요구분석, 목표설정, 조직환경이다. 둘째, 인재개발 교육프로그램의 투입평가 대영역으로 도출한 평가영역은 교육프로그램 전략, 인적자원, 물적자원이다. 셋째, 인재개발 교육프로그램의 과정평가 대영역으로 도출한 평가영역은 교육프로그램 관리, 교수 학습 전략, 교육지원환경이다. 넷째, 인재개발 교육프로그램의 산출평가 대영역으로 도출한 평가영역은 영향력, 효과성, 지속가능성, 전이력이다. 이러한 인재개발 교육프로그램의 평가준거 분석과 대영역 도출에 관한 연구결과는 교육프로그램 평가의 체제적 접근에 기초자료가 될 것으로 판단된다.