• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2005년도 ICCAS
• /
• pp.158-163
• /
• 2005

Competitive electricity markets necessitate equitable methods for allocating transmission usage in order to set transmission usage charges and congestion charges in an unbiased and an open-accessed basis. So in competitive markets it is usually necessary to trace the contribution of each participant to line usage, congestion charges and transmission losses, and then to calculate charges based on these contributions. A UPFC offers flexible power system control, and has the powerful advantage of providing, simultaneously and independently, real-time control of voltage, impedance and phase angle, which are the basic power system parameters on which sys-tem performance depends. Therefore, UPFC can be used efficiently and flexibly to optimize line utilization and increase system capability and to enhance transmission stability and dampen system oscillations. In this paper, a mathematical approach to allocate the contributions of system users and UPFCs to transmission system usage is presented. The paper uses a dc-based load flow modeling of UPFC-inserted transmission lines in which the injection model of the UPFC is used. The relationships presented in the paper showed modified distribution factors that modeled impact of utilizing UPFCs on line flows and system usage. The derived relationships show how bus voltage angles are attributed to each of changes in generation, injections of UPFC, and changes in admittance matrix caused by inserting UPFCs in lines. The relationships derived are applied to two test systems. The results illustrate how transmission usage would be affected when UPFC is utilized. The relationships derived can be adopted for the purpose of allocating usage and payments to users of transmission network and owners of UPFCs used in the network. The relationships can be modified or extended for other control devices.

• 농업과학연구
• /
• 제39권4호
• /
• pp.491-496
• /
• 2012

Vegetable seeds are one of the most important key factors to determine the way of vegetable's production, distribution, processing and storage. Unfortunately, because of international exchange crisis in 1997, the most of main Korean seed companies were merged into foreign capitals. Currently, many domestic seed companies are incapable of their own survey and development of vegetable seed markets in foreign countries. To provide valuable seed market information for these companies, China, especially Yunnan and Guangdong provinces in China, was selected. Since China is one of the major vegetable seed importers. Also, Yunnan and Guangdong provinces are the most promising targets to export Korean vegetable seeds. The current status of vegetable production in China was analyzed with consideration of Yunnan and Guangdong provinces. The contents of survey and analysis are covering major vegetable crops' cultivation area, farm number, cultivation type, production amount, market price, farm income, packaging method, distribution type and amount of seed consumption. And particularly, major horticultural characteristics of leading varieties were presented to assist the development of exportable varieties of domestic seed companies. We assume the results of this study would be practically usable for the development of exportable varieties.

• 산업진흥연구
• /
• 제6권2호
• /
• pp.21-35
• /
• 2021

연구결과 도입측면의 연구는 RPA 도입의 방향, 성과기대, 비용, 규제, 리스크에 초점을 맞추어 진행되어 왔다. 향후 도입측면의 연구는 조직적 측면 연구 외에도 기술적, 환경적 측면의 연구 활성화가 필요함을 알 수 있었다. 적용사례 측면의 연구는 실제 기업, 적용업무, 적용직업을 대상으로 이루어져왔음을 알 수 있었다. 향후 적용사례 측면의 연구는 실제 기업, 적용업무, 적용직업을 대상으로 RPA 기술적용 후 성과에 대한 연구가 필요해 보인다. 시장분석 측면의 연구는 시장의 형성단계, 그리고 미래시장 예측으로 이루어져왔음을 알 수 있었다. 향후 연구는 AI, 4차 산업혁명과 연계되어 미래의 시장이 어떻게 전개될지에 대한 연구는 가능하리라 본다. 수용의도 측면의 연구는 타 주제에 비하여 연구가 상대적으로 미진한 연구 분야라고 할 수 있다. 앞으로 수용의도 측면의 연구가 더욱 활성화된다면 신기술수용 이론의 발전에도 기여하고 RPA도입, RPA적용, RPA시장 활성화에도 시사점을 제시하였다.

• Industrial Engineering and Management Systems
• /
• 제13권3호
• /
• pp.319-329
• /
• 2014

Supply chain management is a subject that has an increasing importance due to the developments in the global markets and technology. In this paper, a fuzzy multi-objective linear programming model is developed for the supply chain of a company dealing with procurement, storage, filling, and distribution of liquefied petroleum gas (LPG) in Turkey. The model intends to determine the quantities of LPG to be procured, stored, filled to cylinders, and transported between the plants and demand centers for six planning periods. In this model, which aims to minimize both total costs (sum of procurement, storage, filling, and transportation costs) and total transportation distances, demand quantities of the main demand centers and decision maker's aspiration levels about objective functions are fuzzy. After comparing the results obtained from the model with those obtained by using different methods, it is concluded that the proposed method can be applied to real world problems practically and it may be used in this type of problems in order to generate an efficient solution.

• 유통과학연구
• /
• 제12권7호
• /
• pp.45-51
• /
• 2014

Purpose - This study aims to explore the success of Lotte Mart in the global market, as well as examining the factors related to its entry methods. Research design, data, and methodology - This study analyzed the differences between Lotte Mart and E-mart in terms of their market entry methods, based on references and secondary data. This study is based on qualitative research that analyzes actual cases. Based on the results, this study analyzed and discussed actual cases based on references and secondary data, including newspaper interviews on Lotte Mart. Results - Lotte Mart succeeded in adapting to local markets it did this by ensuring the use of both mergers and acquisitions (M&As) and greenfield methods. In contrast, E-mart utilized only greenfield methods. Conclusions - The findings of this study may not be generalized to all industries, as only Lotte Mart was examined using the case analysis method. Therefore, the successful market entry modes of various companies should be explored in terms of FDI.

• 유통과학연구
• /
• 제13권9호
• /
• pp.5-11
• /
• 2015

Purpose - The purpose of this research is to provide insights that can be used for deliberate decision making around challenging big data investments by measuring the economic value of such big data implementations. Research design, data, and methodology - We perform empirical research through an event study. To this end, we measure actual abnormal returns of companies that are triggered by their investment announcements in big data, or firm size information, during the three-year research period. The research period targets a timeframe after the introduction of big data at Korean firms listed on the Korea stock markets. Results - Our empirical findings discover that on the event day and the day after, the abnormal returns are significantly positive. In addition, our further examination of firm size impacts on the abnormal returns does not show any evidence of an effect. Conclusions - Our research suggests that an event study can be useful as an alternative means to measure the return on investment (ROI) for big data in order to lessen the difficulties or decision making around big data investments.

• 한국식품영양과학회지
• /
• 제29권6호
• /
• pp.1151-1154
• /
• 2000

국내수삼의 유통 및 포장실태를 조사하고자 1998년 9월 중순부터 1999년 2월까지 생산지로 금산, 풍기, 강화와 소비지로 경동시장과 S 플라자에서 조사하였다. 유통은 수확 후 생산지역의 수삼센터로 운송되고 여기서 중간거래상에 의해 도매가 이루어지며 이를 소비지인 서울 경동시장이나 백화점, 센타내 소매점으로 운반, 소비자에게 판매되고 있다. 수감 거래시 거래단위는주로 차단위 (1차는 750g)가 사용되고 있고 백화점에서 g단위를 사용하고 있었다. 등급은 년근, 색택, 크기 및 모양에 따라서 특대, 특, 대, 중, 소 등으로 나뉘어 거래되고 있다. 같은 등급에서도 수삼개체간의 크기에 따른 편차가 적게는 17%에서 많게는 130%까지 차이가 나므로 수삼의 등급화가 시급히 이루어져야 함을 알 수 있었다. 수삼의 포장실태는 도매단계에서는 10~20kg 용 골판지 상자를 주로 사용하고 PP마대를 일부사용하고 있으며 소비자 단계에서는 PE 봉투가 주로 사용되며 선물용으로 평량 350~390 g 짜리 마닐라판지로 만든 상자를 사용하고 있다. 이와 같이 수삼의 포장은 소비자보다는 거래를 위한 것이며 소비자용도 적정 포장화가 필요하며, 규격포장 개발을 통해서 수삼유통 현대화가 이루어져야 된다고 사료되었다.

• Journal of the Korean Data and Information Science Society
• /
• 제16권3호
• /
• pp.567-580
• /
• 2005

It is usually assumed that asset returns in the stock market are normally distributed. However, analyses of real data show that the distribution tends to be skewed and to have heavier tails than those of the normal distribution. In this paper, we investigate the method of estimating the value at risk(VaR) of stock returns. The VaR is computed by using the transformation and back-transformation method. The analysis of KOSPI and KOSDAQ data shows that the proposed estimation outperformed that under the normal assumption.

• 한국유통학회지:유통연구
• /
• 제2권1호
• /
• pp.9-34
• /
• 1997

The marketing environment around the Korean retail stores is becoming increasingly voltage due to the recent changes in the marketplace. These changes are not only offering business opportunities but also posing competitive threats for many retailers these days. The key to survival and growth of these retail stores lies in developing and delivering quality services. This article reports the findings of a field survey which measured customers current perceptions of six different types of stores in terms of various service dimensions. The store types examined in the study were: traditional markets, department stores, shopping centers$.$supermarkets, convenience stores, discount stores, and membership wholesale clubs. The study also makes an attempt to determine service dimensions which have significant impact on customer perceptions across different store types. By analyzing the gap between how stores are perceived and how they should be perceived, the article discusses and suggests strategic directions for each type of retail stores.

• 산경연구논집
• /
• 제3권2호
• /
• pp.17-21
• /
• 2012

Purpose - The objective of the paper is to explain the factors affecting on the Re-contract intension of franchisor in the uprising Chinese franchise market. Research design, data, methodology - The study conducted a survey on the 400 franchisors data in China from January to July 2012. By AMOS analyzing the data to examine these hypotheses empirically, we can confirm most hypothesis supposed. Results - This study shows that the high management performance and satisfaction of the franchise headquarters has a positive effect on the Re-contract intention of franchise. In the case of large markets such as China, the franchisor's strategy and the role is very important. Conclusions - This study provides franchisors and practitioners, who plan to extend their franchising business abroad into Chinese market, with some practical knowledge. in order to achieve stable profits, the franchise corporation needs to support the operation of the individual franchisee through incentives and standardization of services.