• Journal of Korea Technology Innovation Society
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• v.6 no.2
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• pp.213-227
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• 2003

초고속 인터넷 서비스는 사용자수의 증가와 더불어 고객의 다양한 욕구 즉 인터넷 방송, 주문형비디오(VOD)서비스, 원격교육, 고화질 TV 등 대용량의 멀티미디어 서비스에 대한 욕구가 폭발적으로 증가하고 있다. 이러한 욕구를 충족하기 위해서는 현재의 초고속 인터넷서비스로서는 속도에 대한 한계에 부딪치게 되어 통신사업자들은 새로운 기술 또는 여러 가지 기술적 대안들을 추구하고 있다. 2002년부터 시작하여 2003년 이후에는 멀티미디어 수요의 증가에 따라 ADSL을 대체하는 기술로 VDSL이 등장하여 매년 꾸준한 신규가입자 수요가 발생하고 있으나, 통신사업자들은 각각의 망 특성, 시장위치, 전략적 필요성 둥에 의해 상용화를 적극 검토,추진하고 있으나 각각 전개하는 방식은 조금씩 다르다. 따라서 본 연구에서는 통신사업자들의 가입자망 진화 전략에 대해 살펴 본 다음 Lot3n-Volterra Competition (LVC) 모델을 이용 ADSL 과 VDSL 두 기술간의 상호 경쟁 및 대체를 통해 어떻게 진화 되어가는지를 살펴보았다. 대표적인 통신사업자인 KT는 막강한 자금력을 바탕으로 시장 확대 및 경쟁사와의 차별화를 위해 VDSL 서비스 조기도입을 서두르고 있고, 하나로는 자금의 열세로 인한 ADSL 투자비를 회수 할때까지 VDSL 서비스를 연기하고 있는 실정이다. ADSL과 VDSL 두 기술의 관계는 Lotka-Volterra Competition (LVC) 모델을 이용한 시뮬레이션 결과를 통해 빠른 속도와 비슷한 가격대의 VDSL이 침략자(predator)로 기존 시장 지배자인 ADSL을 사냥감(prey)으로 빠른 속도로 대체해 나가는 것을 알 수 있었다.

• Korean Journal of Social Welfare Studies
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• v.40 no.2
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• pp.59-87
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• 2009

The purpose of this study is to empirically test some hypotheses derived from the alliance model of the family, which focuses on theorizing situations in which family members simultaneously compete with other members within a family and rivals in society to maximize their statuses in the family and in society. Specifically, associations between wives' level of income relative to that of their husbands and each spouse's satisfaction with family relationships were examined, using the first wave of Korea Welfare Panel Study having been conducted in 2006 by the Korea Institute for Health and Social Affairs. The results of the analyses showed that three ones among four research hypotheses were supported. Wives' satisfaction with family relationships was negatively associated with their relative level of income. This pattern strongly appeared among wives from lower class families rather than among wives from middle/upper class families. Relationship between wives' relative level of income and husbands' satisfaction with family relationships was likely to be bi-directional among husbands from middle/upper class families. Unlike the author's expectation, however, this bi-directional relationship was not observed among husbands from lower class families.

• Korean Journal of Environment and Ecology
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• v.30 no.2
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• pp.173-184
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• 2016

Knowledge of the relationships among interspecific competition, spatial distributions and ecological niches plays an important role in understanding biogeographical distribution patterns of species. In this study, the distributional characteristics and ecological niches of the three Viperidae species (Gloydius ussuriensis, G. brevicaudus, and G. saxatilis) in South Korea were determined based on observation data and species distribution model. The effects of interspecific competition on geographical distribution and the division of the ecological niches of the vipers were also examined based on the models of predicted species distribution. The results showed that altitude was the most important environmental variable for their distribution, and the altitudes at which these snakes were distributed correlated with the climate of that region. Although interspecific ecological niches are quite overlapped, their predicted distribution patternsvary by the Taebaek Mountains. When overlaying the distribution models, most of the overlapping habitats were forest areas, which were relatively less overlapped than were the entire research areas. Thus, a parapatric distribution pattern was expected. The abundance of species occurring sympatrically was positively correlated with each other, indicating the lack of serious interspecies competition in this region. In conclusion, although the three Viperidae species in South Korea occupy similar ecological niches, these snakes exhibit parapatric distribution patterns without direct competition. Further research on various geographic variables (e.g., altitude, microhabitat characteristics) using relatively fine grid sizes, as well as further detailed ecological and behavioral research, is needed to determine the causative factors for the parapatric distribution pattern.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2007.11a
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• pp.571-575
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• 2007

With intensive competition due to the limited growth of the domestic construction market volume and the opening and construction boom of international construction market, construction firms register to grope strategy of enterprise dimension for improvement such as entry extension of domestic construction market order corporate strategy and international construction market. In this research, influence factors of corporate strategy are extracted and their interrelationships are presented in the domain of change of external environment with the internal and external market system, construction enterprise's internal capacity and corporate strategy, government and the internal and external market. The result of this research will be used for quantitative analysis through system dynamics simulation and basic data of model effectiveness verification through actuality domestic construction enterprise's case study, and can be used to basic data of new corporate strategy establishment because construction enterprise forecasts effect hereafter establishing corporate strategy in construction environment that change rapidly.

• Proceedings of the Technology Innovation Conference
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• 2004.06a
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• pp.249-269
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• 2004

현재 국내 원자력 발전산업은 상당한 기술자립을 이루었고, 외국으로의 기술 수출을 시도하고 있을 정도로 상당한 경쟁력을 갖고 있다는 의견이 지배적이다. 실제 한국전력, 원자력 연구소 등에서는 원자력 기술을 해외에 수출하고자 노력하고 있다. 원자력 발전기술의 해외 수출이나 연구개발 사업에서 가장 중요한 지표 중의 하나가 원자력 발전산업의 기술수준 또는 기술경쟁력이다. 또한 국외 뿐 아니라 국내에서도 발전원별 경쟁체재 도입으로 인해 원자력 발전의 경쟁력 평가는 원자력의 타 발전원 대비 경쟁력 확보 측면에서 중요한 사항이 되었다. 본 연구에서는 원자력 발전산업의 효율적인 기술개발 전략 수립을 지원하기 위한 모델을 System Dynamics 방법론을 사용하여 개발하였다. 이를 위하여 우선 원자력 발전산업의 기술경쟁력 평가를 위한 변수 및 평가범위를 선정하고, 선정된 변수들의 인과관계를 정성적으로 평가할수 있도록 인과지도(Casual Loop Diagram)를 개발하였으며, 이를 정량화하여 평가할 수 있도록 흐름도(Stock Flow Diagram)를 개발하였다. 개발된 모델을 사용하여 총 연구비 등의 정책관련 변수들을 변화시키면서 시뮬레이션을 수행해보았다. 본 연구의 한 결과로서 기준 시나리오에 대한 분석 결과 2004년 이후의 원자력발전산업 순편익 누적 결과는 다음과 같다. 순편익 누적(억원) : 2015(년도) 19,169, 2025(년도) 61,396, 2035(년도) 106,598, 2045(년도) 143,813, 발전 비용 감소분 누적(억원) : 2015(년도) 9,370, 2025(년도) 39,182, 2035(년도) 73,409, 2045(년도) 103,212, 국산화율 증가로 인한 수입액 감소분 누적(억원) : 2015(년도) 6,388, 2025(년도) 13,367, 2035(년도) 18,756, 2045(년도) 22,595, 시장점유율 증가로 인한 수출액 증가분 누적(억원) : 2015(년도) 3,411, 2025(년도) 8,847, 2035(년도) 14,433, 2045(년도) 18,005 또한 시나리오 비교평가를 실시하여 본 결과, 본 연구에서 정의한 순편익 누적(Cumulative Net Profit) 변수를 적용하면 현재 연구비 추세 대비 $30\%$ 까지 연구비를 증가 시키는 것이 효율적임을 알 수 있었다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.8
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• pp.3458-3465
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• 2011

Business relationships can be divided into vertical and horizontal relationships. Relationship between horizontal competitors in the business of business to be done is generally vertical relationship between the main office Suppliers and Contractors says business done. In general, the number of models of business relationships through a lot of things are known. Model consisting of a vertical relationship, but there are not many highlights. In this paper, the vertical relationship problems based on the business model to develop. Vertical relationships include leading industrial electronics, automotive and many industrial tempted to target the automotive industry, but in this paper developed a model to look at. In Chapter 2 the theoretical background needed to develop a process model to examine the vertical relationship between Chapter 3 Features Find out about your business. Followed by Chapter 4 of this paper, the vertical relationship between the core business process model is developed. Finally, Chapter 5 of the study limitations and future research directions are suggested.

• Korean journal of food and cookery science
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• v.26 no.3
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• pp.335-345
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• 2010

The objective of this study was to model the kinetics of S. aureus survival on high risk foods in school foodservice operations. After inoculating S. aureus ATCC25923 onto the various high risk foods, the effects of competitive microorganism, storage temperatures($25^{\circ}C$, $35^{\circ}C$), and initial contamination levels ($1.0{\times}10^2\;CFU/g$, $1.0{\times}10^5\;CFU/g$) on the growth of S. aureus were investigated. Lag time decreased and specific growth rate increased with a storage temperature ($25^{\circ}C$<$35^{\circ}C$) and with a higher initial inoculation level ($1.0{\times}10^2\;CFU/g$<$1.0{\times}10^5\;CFU/g$). Previously it was shown that S. aureus is a weaker competitor than other organisms, but it proliferates aggressively in a noncompetitive environment. However, in our study, when S. aureus was used to inoculate japchae (glass noodles with sauteed vegetables) and meat ball, the growth of S. aureus was similar and more active with competitive organisms than that without competitive organisms. Regardless of other factors, the initial level of S. aureus was a more significant factor of the growth. High inoculation levels of S. aureus were reached at 6 log CFU/g within 3 hours. An incubation temperature of $35^{\circ}C$ and the animal protein component of menu items also were identified as significant factors influencing the growth of S. aureus. Therefore, the duration of time meals are stored before serving should be considered a critical control point. Food service providers must control time and temperature to insure the safety of cooked foods.

• Journal of the KSME
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• v.29 no.6
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• pp.581-585
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• 1989

우리나라에 있어서의 선박용 원동기의 개발연구실태에 관하여 개략적으로 살펴보았다. 외형적으 로는 세계 제2위라는 실적을 갖고 있으나 아직도 내세울만한 고유모델이 하나도 없다는 것은 문제이다. 다만 금번 투자제한 조치가 해제됨으로써 가장 관심의 대상이 되는 중형기관분야에서 치열한 경쟁이 예상됨으로써 이 분야에서 크다란 발전이 기대된다. 중형기관의 발전은 선박용 으로 뿐만 아니라 육상에서는 철도차량으로도 전용이 가능하기 때문에 국가의 기간동맥을 국산 화하고 다른 한편으로는 방위산업과도 관계를 갖고있는 등 이용범위가 넓기 때문에 개발투자효 과도 클 것으로생각된다.

• Informatization Policy
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• v.23 no.3
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• pp.84-116
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• 2016

This paper explores alternative organizational models for ICT units of local governments, while analyzing the task contents, organizational structures and work relations of ICT departments in 17 Korean metropolitan provinces. We employed both quantitative and qualitative methods including in-depth interview, open-ended survey, and hard data analyses to collect a wide variety of information on organizational performance, human resource development, and task characteristics of ICT units. As strategies to enhance task contents, organizational structures and work relations of ICT departments, we suggest four ideal ICT organizational models for local governments: Relation Model, Resource Model, Curation Model and Creation Model.

• The Journal of the Korea Contents Association
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• v.11 no.8
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• pp.409-418
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• 2011

An aims of this study is to examine substitute or complementary among types of special interest tourism and a causal relationship between total individual tourism demand and each types. Of 500 surveyed respondents in Seoul, 348 was valid to analyse. As statistical analysis method, correlation analysis was utilized for substitute or complementary and Econometrics models were applied for causal relationship. The results of this study demonstrate that agro tourism and ocean tourism lie on substitute which means competitive. Also, ocean tourism has had more impacted on total individual tourism demand than any other types of special interest tourism.