• 정보관리학회지
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• 제19권2호
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• pp.159-179
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• 2002

웹 정보체계에서 여러 가지 다양한 종류의 정보자원을 보다 효과적으로 관리하기 위하여, 인터넷 정보를 기술하고 있는 서로 다른 메타데이터 표준들간의 상호운용성 문제가 점차 중요한 비중을 차지하게 된다. 이러한 문제점을 해결하기 위하여 IFLA의 FRBR, INDECS, ABC 모델 등의 상호연동 모델들을 비교·분석함으로서, 다양한 형태의 메타데이터간의 상호연동을 위한 새로운 방식의 상호운용성 모델을 개발, 제안하였다. 리소스모델의 기본·메타데이터 항목 요소들로부터 중심이 되는 개체(core entity)와 이와 연관된 주요 사건(core event)들을 식별하고. 이를 리소스중심 중간모델과 이벤트중심 중간모델로 변환(swapping)하는 과정을, 구체적인 방법을 제시함으로써, 이들 모델간 전환 방법을 명확하게 제시하였다.

• 한국경영과학회지
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• 제30권4호
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• pp.99-115
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• 2005

For an analysis of the performance of a computer system, the minimum cycle time method has been widely used. The minimum cycle time method is a mathematical technique with which we can find the minimum duration time needed to fire all the transitions at least once and coming back to the Initial marking in a timed net. A timed net is a modified version of a Petri net where a transition is associated with a delay time. In the real world, an event is associated with a probability of occurrence. However, a timed net is not equipped with any facility of specifying probability of event occurrence. Therefore, the minimum cycle time method applied on a timed net can easily overlook probabilities of occurrences of events and yield a wrong result. We are proposing 'Timed Net with Probabilities of Choices' where a transition can be associated with both delay time and a probability of occurrence. We also introduce an algorithm for minimum cycle time analysis on a 'Timed Net with Probabilities of Choices'. As an example of application, we are performing an analysis of the location based service system using 'Timed Net with Probabilities of Choices'.

• 지식경영연구
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• 제13권5호
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• pp.139-160
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• 2012

Win-win growth between large companies and small and medium enterprises (SMEs) become a critical encomic and social issue in Korea. Korea government has been attempted to establish strong policy to build right win-win relationship between large companies and SMEs. Along with this strong drive from Korea government, a variety of strategies that enhance win-win relationships between large companies and SMEs have been adopted. Win-win growth policy is expected to provide positive impact on sustainable competitive advantage of firms. Therefore, many studies have focused on the win-win growth policy success factors, type of the policy, and the results of the policy. Although there is much literature on the win-win growth policy, the effects of win-win policy on firm value is not well understood. We addressed this issue by exploring how win-win growth policy influences a firm's market value using event study methodology. We evaluated the cumulative abnormal returns for win-win growth policy announced by Korean large firms from 2004 to 2012. The results of this study insisted that the announcements of win-win growth policy show negative impact on firm's market value, which is not consistent with previous studies. The findings of this study offer insights that may help government policy makers and managers to revise their policy for better outcomes of their win-win growth policy.

• 한국콘텐츠학회논문지
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• 제10권11호
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• pp.92-101
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• 2010

세계의 많은 도시들은 국제 행사의 개최를 통해 각 도시의 인지도와 이미지를 제고하려는 노력을 기울이고 있다. 본 연구에서는 대형 스포츠 이벤트인 2008 베이징 올림픽이 베이징 이미지에 미치는 영향에 대해 부산시민 197명에 대한 설문조사를 실시하여 살펴보았다. 수집된 자료의 분석 결과, 주말의 베이징올림픽 시청시간은 베이징에 대한 친밀감, 베이징에 대한 태도와 정적인 상관관계를 갖는 것으로 나타났다. 베이징에 대한 친밀감과 베이징 올림픽 게임 운영에 대한 평가는 베이징에 대한 이미지, 베이징에 대한 태도, 베이징에 대한 방문의도에 유의미한 영향을 미치고, 그 중에서 베이징에 대한 친밀감이 더욱 큰 영향을 미치는 것으로 나타났다.

• Weed & Turfgrass Science
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• 제3권2호
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• pp.130-136
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• 2014

Tall fescue is commonly well-adapted for low maintain area because of its wear resistance, deep root system, and drought tolerances. Deep and infrequent irrigation refers to applying large amounts of irrigation, 1.3 to 2.5 cm or more, in a single irrigation event. Light and frequent irrigation is commonly used with small amounts of water, 0.3 to 0.6 cm, every day or every other day. N use for turfgrass management is often unnoticed for water management. The objective of this field study was to evaluate the effects of irrigation frequency and N rates for tall fescue growth. The three irrigation treatments were no irrigation (precipitation only), 0.5 cm applied every other day, and 1.8 cm applied once a week at one irrigation event. The nitrogen (N) treatments were the low, medium, and high N rate treatments. The low, medium, and high N treatments were applied over 2, 4, and 6 applications, respectively. If high main maintenance of tall fescue is not important and water source is limited, irrigation is not necessary and, the $9.8gNm^{-2}yr^{-1}$ of two applications can be recommended for tall fescue under the weather condition of the study.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 1990년도 춘계공동학술대회논문집; 한국과학기술원; 28 Apr. 1990
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• pp.22-31
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• 1990

본 논문에서는 컴퓨터 통신 프로토콜의 모델링과 시뮬레이션에 관한 이론적 인 연구를 하였다. 먼저 통신 프로토콜의 정의와 기능을 설명하였고 통신 프 로토콜을 위한 모델을 분류하였다. 또한, 통신 프로토콜의 모델 중에 Timed Petri Net(TPN) 모델에 시간함수 .tau.를 부여함으로써 TPN을 구조적으로 정의하였으며 TPN Based 모델의 문제점을 보완하기 위하여 시스템 시뮬레 이션 분야의 이산사건 시스템 명세(DEVS:Discrete Event Simulation) 개념 을 도입하였다. 중요한 연구 결과로서 TPN모델이 DEVS모델이라는 정리를 제시하고 증명하였다. 이 정리에 따르면, TPN모델을 시뮬레이션 할 때 시뮬 레이션을 위해 모델을 설계할 필요없이 DEVS모델로 변환하여 사용함으로써 시뮬레이션을 수행할수 있다.

• 경영과학
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• 제30권1호
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• pp.91-102
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• 2013

This study has an aim to analyze the effects of ADS on conjunctivitis patients among the residents of Seoul, Korea, between 2005 and 2008. For this purpose, the number of medical services provided to conjunctivitis patients on the days of windblown dust storms and the days without any windblown dust storms were analyzed by conducting paired t-test. The interactive effects of the ADS density and the accuracy of ADS forecast on the fluctuation of conjunctivitis cases were also investigated. The results showed that, even with an accurate forecast issued 24 hours prior to the event, the average number of medical services provided for conjunctivitis was higher on the index days than the comparison days. On the other hand, in cases of failure to provide an accurate forecast 24 hours prior to the ADS event, the number of conjunctivitis attacks reported was statistically significantly higher on the index days for 3~5 days after the occurrence of a dust storm in relation to the comparison days. We also found that the rate of increase in asthma treatments on the index days with low level of $PM_{10}$ concentration rather than high $PM_{10}$ level was more significant for all lag days. This study provides evidence that ADS events are significantly associated with conjunctivitis symptoms and the failure to forecast ADS events with low $PM_{10}$ level might aggravate conjunctivitis disease.

• 대한안전경영과학회지
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• 제12권2호
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• pp.167-172
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• 2010

EPCIS(EPC Information Service) system is a core component of EPCglobal Architecture Framework offering information of the freights, the time of awareness and the location of awareness on the EPCglobal Network. EPCIS Repository continuously stores and manages mass EPCIS Event input data from a great number of RFID devices simultaneously. The Hybrid DBMS can deal efficiently mass necessary data. This study suggest the plan which can efficiently manage EPCIS Repository using Hybrid DBMS. We offer three schema and stores EPCIS Event data to Altibase DB that can efficiently manage EPCIS Repository using Hybrid DBMS and compare the performance about three schema through simulations.

• 한국건설관리학회논문집
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• 제8권4호
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• pp.99-109
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• 2007

교통시설물의 위험요소는 안전피해의 규모 및 종류 등 복잡한 제반요소에 영향을 받기 때문에 안전개념에 기초한 분석이 요구된다. 이를 위해 본 연구에서는 교통안전시설에 대한 정성적 및 정량적 위험도분석 방법을 제시하고 이를 가치평가에 도입할 수 있는 절차를 제안하였다. 또한 정량적 분석을 위해 교통사고 데이터 및 이를 분석한 EPDO(Equivalent Property Damage Only)를 이용하여 사고빈도와 피해정도 및 사고요인별로 Event Tree를 작성하여 제시하였으며 이를 이용하여 중앙분리대 비교 1안(140cm) 및 비교 2안(127cm)에 대한 위험지수를 산정하였다.

• 스마트미디어저널
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• 제8권4호
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• pp.72-79
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• 2019

The automated demand response (DR) program encourages consumers to participate in grid operation by reducing power consumption or deferring electricity usage at peak time automatically. However, successful deployment of the automated DR program sphere needs careful assessment of appliances load profile (ALP). To this end, the recent method estimates frequency, consistency, and peak time consumption parameters of the daily ALP to compute their potential score to be involved in the DR event. Nonetheless, as the daily ALP is subject to varying with respect to the DR time ALP, the existing method could lead to an inappropriate estimation; in such a case, inappropriate appliances would be selected at the automated DR operation that effected a consumer comfort level. To address this challenge, we propose a more proper method, in which all the three parameters are calculated using ALP that overlaps with DR time, not the total daily profile. Furthermore, evaluation of our method using two public residential electricity consumption data sets, i.e., REDD and REFIT, shows that our energy management systems (EMS) could properly match a DR target. A more optimal selection of appliances for the DR event achieves a power consumption decreasing target with minimum comfort level reduction. We believe that our approach could prevent the loss of both utility and consumers. It helps the successful automated DR deployment by maintaining the consumers' willingness to participate in the program.