• Electronics and Telecommunications Trends
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• v.22 no.6
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• pp.194-205
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• 2007

국내 통신서비스는 2000년 이후 유무선 인터넷을 중심으로 급성장을 해왔으나 기존 서비스에 대한 가입자 정체와 FTTH와 HSDPA, 와이브로를 중심으로 서비스 고도화 추세에 있다. 정체기와 전환기의 시장 특성이 나타나는 상황에서 통신사업자들은 자사 가입자를 유지하고 타사 가입자를 전환시키려는 마케팅 활동이 치열하게 전개되고 있다. 이에 통신소비자의 특성을 체계적으로 파악하는 것이 가입자 유지 및 전환활동의 관건이 된다. 본 글에서는 시장조사 결과를 바탕으로 초고속인터넷 이용시간, 이동전화 이용요금 수준, 이동전화 무선인터넷 이용여부, 모바일 브로드밴드 이용의향, 소비자의 혁신성향을 중심으로 현재 현안이 되고 있는 사항에 대해 국내 통신소비자의 개인 특성 및 서비스 이용 특성을 파악하고 시사점을 전개하고자 한다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.33 no.6
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• pp.2267-2275
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• 2013

Existing conventional model for analysis of shallow water flow just assumed the internal boundary condition as free-slip, which resulted in the wrong prediction about the velocity, vorticity, water level, shear stress distribution, and time variation of drag and lift force around a structure. In this study, a finite element model that can predict flow characteristics around the structure accurately was developed and internal boundary conditions were generalized as partial slip condition using slip length concept. Laminar flow characteristics behind circular cylinder were analyzed by varying the internal boundary conditions. The simulation results of (1) time variations of longitudinal and transverse velocities, and vorticity; (2) wake length; (3) vortex shedding phenomena by slip length; (4) and mass conservation showed that the vortex shedding had never observed and laminar flow like creeping motion was occurred under free-slip condition. Assignment of partial slip condition changed the velocity distribution on the cylinder surface and influenced the magnitude of the shear stress and the occurrence of vorticity so that the period of vortex shedding was reduced compared with the case of no slip condition. The maximum mass conservation error occurred in the case of no slip condition, which had the value of 0.73%, and there was 0.21 % reduction in the maximum mass conservation error by changing the internal boundary condition from no slip to partial slip condition.

• Journal of The Korean Association For Science Education
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• v.41 no.1
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• pp.47-57
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• 2021

This study aims to explore the epistemic goals that pre-service elementary teachers can construct in their biology-related knowledge construction activities, how these goals are constructed, and how the shaping of the knowledge construction activities around the goals was afforded or constrained. The research participants were 26 pre-service teachers, divided into 11 groups of two or three to engage in the activity. Their discussions and products were collected and used as data for this study. The analysis revealed that the teachers constructed three types of epistemic goals: making sense of natural phenomena, proposing the most effective course of action, and proposing solutions to problems based on their causes. Construction of different types of goals depended on the conclusions the pre-service teachers expected to draw based on the explored natural phenomena. It was found that the elicitation of the pre-service teachers' epistemic goals could facilitate their shaping of the knowledge construction activity as an evidence-based justification. The participants planned the construction of mechanistic explanations of natural phenomena with the epistemic goals of 'making sense of natural phenomena' or 'proposing solutions to problems based on their causes.' However, enacting their knowledge construction plans with sophisticated epistemic features was constrained due to the limited resources available. This study can contribute to developing instructional strategies that facilitate learners' epistemic agency and addressing epistemic agency in the development of pre-service teacher education methods.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.34 no.5
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• pp.144-155
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• 2022

The Korea Coast Guard evaluates the risk of major coastal activity places to prevent coastal accidents, and patrols and manages them based on that, but it is not responding properly to the continuously increasing number of coastal accidents. The reason for this is that, despite the gradual expansion of coastal activity places, there is a lack of manpower to manage and supervise them, resulting in blind spots in coastal accident safety management. Therefore, in order to solve this problem, it is necessary to prepare more efficient and effective measures that check and supplement the current coastal safety management system. Coastal accidents show different characteristics of accident causes and places due to differences in the activity characteristics of users according to time. As a result of analyzing coastal accident data (2017~2021), the frequency of daytime accidents is high in the case of sea rock, beach, and offshore, where family leisure activities are frequent. In the case of wharf, tidal flat and bridge, where accidents due to drinking, disorientation, and suicide mainly occur, the frequency of accidents at night is high. In addition, there were more accidents on weekends when the number of users increased compared to weekdays. This trend indicates that the user's temporal activity characteristics must be reflected in the risk assessment of coastal activity places. Therefore, in this study, based on the case of coastal accidents, the characteristics of accidents at coastal activity places according to time were identified, and the criteria were presented for risk evaluation by grading them. It is expected that it will be possible to lay the foundation for reducing coastal accidents by efficiently managing and supervising coastal activity places over time using the presented evaluation criteria.

• Proceedings of the Technology Innovation Conference
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• 2009.02a
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• pp.489-518
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• 2009

선진국의 경제구조가 서비스경제로 전환됨에 따라 고부가가치를 낼 수 있는 지식기반 (Knowledge-based) 또는 기술기반 (Technology-based) 서비스의 중요성이 부각되고 있으며 서비스 기업들간의 경쟁도 매우 치열해지고 있다. 서비스 기업들은 보다 차별화 된 고객가치를 창출하고 미래의 핵심역량을 확보하기 위해 다양한 활동을 전개하고 있으나 제조기업과는 달리 대부분의 서비스 기업들에게 연구개발 (Research and Development, R&D)이라는 개념은 매우 생소한 상태이다. 최근 유럽을 중심으로 서비스기업의 연구개발에 관한 논의가 활발히 진행되고 있지만 서비스기업의 특성을 포괄하는 연구개발에 대한 정의를 내리는 수준에 머물고 있다. 최근 우리나라 정부에서도 서비스 연구개발에 관한 정책입안을 위해 연구를 진행하고 있는바, 서비스기업에서의 연구개발에 대한 정의, 조직, 예산, 활동영역, 산출물 및 이에 따른 정책적 지원 등에 관한 학계에서의 연구는 거의 이루어지지 않고 있는 실정이다. 본 연구에서는 서비스기업의 연구개발활동을 도출하고 연구개발투자와 기업성과와의 관계를 분석함으로써 효과적인 연구개발 투자규모를 도출하는 것이 목표이다. 이 때 서비스기업의 연구개발활동이라 함은 연구개발 대상, 수행조직, 연구개발의 중요성이 포함된다. 또한 연구개발투자와 1-2년 후의 매출 및 순이익의 변화를 분석한다. 실증분석을 위해 기술기반 서비스를 대표하는 국내 IT서비스 기업을 대상으로 설문조사를 실시하였으며 다양한 통계분석을 활용하였다. 연구결과 대부분의 서비스 기업 응답자가 연구개발의 중요성을 크게 느끼고 있는 것으로 나타났다. 기업마다 부서별 또는 중앙 연구개발센터를 중심으로 다양한 연구개발활동을 수행하고 있으며 연구개발투자가 기업성과로 연계되기 위해서는 최고경영자의 관심이 가장 중요한 요인인 것으로 지적되었다. 가장 효과적인 연구개발 투자규모는 매출액 대비 15-19%인 것으로 분석되었는데 이는 벤처기업의 특성을 갖는 중소 IT서비스 기업들의 참여가 많았기 때문일 것으로 해석된다. 본 연구의 결과는 우리나라 서비스기업들이 미래준비를 위한 활동을 전개함에 있어 고려해야 할 주요 요인들을 제시해 줄 것이다.

• Journal of Digital Convergence
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• v.15 no.10
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• pp.501-512
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• 2017

The purpose for this study was to figure out the effect factors of baby boom generation' leisure and preparation for old aged on life satisfaction and moderated regression for spouse support. A survey of baby boom generation who are living in Seoul and metropolitan areas was conducted 406 collected data. The results are as follows. First, Leisure had influences on life satisfaction. Second, Preparation for old aged and independent leisure had a positive effect on life satisfaction. Third, Preparation for old aged had mediate leisure on the effect on life satisfaction. Fourth, spouse support. had moderated regression leisure on the effect on life satisfaction. Fifth, Moderated regression for spouse support. had a negative effect on life satisfaction mediated economic preparation for old aged and had a positive effect on life satisfaction mediated physical preparation for old aged.

• The Journal of the Korea institute of electronic communication sciences
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• v.8 no.2
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• pp.371-378
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• 2013

This study was attempted in order to offer basic data for enhancing oral health by surveying the activity limitation realities caused by oral disease in university students and then by analyzing its relevant factors. As a result of research, university students' activity limitation experience rate accounted for 24.1%. The average number of activity limitation days stood at 0.44 day. Matters related to university students' activity limitation included housing type as for socio-demographic characteristics, and busyness in daily life, difficulty for supplying school expenses, temporal burden given using dental treatment, and difficulty for transportation given using dental treatment as for individual characteristics. In case of feeling difficulty for raising school expenses, the possibility was indicated to be high in activity limitation experience, illness experience, experience of having trouble in performing schoolwork, and schoolwork loss experience. Also, in case of feeling difficulty for transportation given using dental treatment, the possibility was indicated to be high in experiencing a trouble in performing schoolwork and a loss of schoolwork. Accordingly, a national interest and support are earnestly demanded in order to establish the more systematized oral health level and to increase oral health promotion.

• Journal of the Economic Geographical Society of Korea
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• v.15 no.2
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• pp.147-165
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• 2012

Recently, the theory of open innovation emerges as a new innovation paradigm. This paper aims to examine open innovation activities of SMEs. Many firms tend to search new knowledge from various external sources and to pursue to achieve innovation resources or knowledge of external innovators. Particularly, this paper focus on the process of external knowledge networking and open innovation occurred in the process of technology innovation. The data used in this study were those that had been collected for total 3,400 sample SMEs that had conducted R&D. and in-depth interviews were conducted with 14 SMEs located at Chungbuk-Technopark. Empirical findings can be summarized as follows; SMEs tend to search new knowledge from various external sources and to pursue to achieve innovation resources or knowledge of external innovators, because they have lack of innovation resources. therefore, the conducting of open innovation affected positively the innovation performance of SMEs. In addition, empirical findings also indicated that expanding flexibility of labor market enhances open innovation activities of SMEs.

• Korean Journal of Family Social Work
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• no.53
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• pp.7-44
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• 2016

The purpose of this study was to find an appropriate approaches for successful aging adapt to Korean older women 's needs. For this purpose, this study did a comparative study between middle-aged and elderly women. Data from the third Korean longitudinal study of aging were analyzed by network analysis and statistical methods. The results were as follows. From network analysis, it was identified the participation difference of productive activities between middle-aged and elderly women according to level of education, subjective heath condition and residential area size. From the multiple regression analysis, voluntary activity, existence of spouse, residential area, family income and level of education significantly affected satisfaction of life quality in middle-aged women while family caregiving, age, religion, residential area, family income and level of education were significant in elderly women's satisfaction of life quality. Based on these results, it was suggested several implications to increase productive activities according to characteristics of Korean middle-aged and elderly women.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2005.05a
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• pp.927-932
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• 2005

전투기를 적절히 정비하는 활동은 공군력을 유지하는데 중요하다. 일반적인 정비정책은 정해진 일정으로 주요 모듈의 정비를 수행한다. 그러나, 이러한 정비활동은 시간에 따라 변하는 모듈의 특성을 반영할 수 없다. 이에 본 연구는 변동되는 평균 고장간 시간 (MTBF) 과 평균 수리 시간 (MTTR)을 산출할 수 있는 확률효과회귀모형을 이용하여 시간에 따라 변동되는 모듈의 특성을 반영한 동적 예방정비 주기를 예측하고자 한다. 본 연구의 결과는 대한민국 공군의 전투 준비 태세 향상에 이바지 할 것으로 기대된다.