• Journal of the Korea Society for Simulation
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• v.25 no.4
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• pp.65-75
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• 2016

Unused spare parts of military equipments which have been kept in the warehouse for a long term have been recognized as wasting of defense budget which also decreased people's confidence in the field of national defence. It is known that overstock is caused by information distortion and bullwhip effect from downstream to upstream in the logistic support as is like business cases. After upgrading the logistic information system, it is possible for Army Logistics Command(ALC) to know demand information of end-user which is the key factor to reduce bullwhip effect. However, inventory is still overstocked and stock-out at the same time. Previous studies have not accounted for these phenomenons and have mainly focused on forecasting inventory level instead of budgetary process(budget period, PROLT, ASL/N-ASL). Thus, this study focuses on the information distortion, overstock and stock-out which caused by budgetary process in the logistic support with system dynamics and simulation.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2000.04a
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• pp.522-525
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• 2000

본 연구에서는 고객의 재고 수준을 고려하면서 동시에 연간 수송비용을 최소로 하는 차량 경로결정문제 IRP(Inventory Routing Problem)에 새로운 위성창고 (Satellite facility)개념을 도입한 수리모델과 알고리즘을 개발하였다. 위성창고는 수송 가능 용량을 초과하는 수요가 발생했을 때 수송 도중에 물량을 보충하여 재고 보충 일정 시간 내에 운반을 할 수 있도록 하는 장치이며 여기서는 용량의 한계를 고려한 위성창고 개념을 도입하였다. 또한 재고 보충 일정 관리 문제와 차량 경로 결정 문제를 분리하여 순차적으로 발견적 기법을 이용하는 기존의 방법을 통합 최적화 알고리즘으로 구현하였다.

• Journal of Intelligence and Information Systems
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• v.19 no.2
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• pp.21-38
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• 2013

The purpose of this study is to investigate the influence of behavioral factors (buyer's tendency to reflect stockout and overstock experiences in ordering decision) on the supply chain performance. This study employs system dynamics to examine the influence of these behavioral factors derived from the interview with several representatives of retailers in South Korea. The results show that different contract can bring different performance (total profit, seller's profit, buyer's profit, order quantity, sales quantity, overstock, and stockout). The results also suggest that these behavioral factors play a significantly influential role in the performance of supply contract. These results imply that supply contract should be established based on the analysis of behavioral factors of supply chain participants.

• Management & Information Systems Review
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• v.32 no.1
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• pp.63-85
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• 2013

This study tries to investigate the fundamental implications inherent in inventory asset information(specifically, unexpected inventory investment) by analyzing how the relationship between unexpected inventory investment and future operating performance. And we study how is the response of the stock market participants to the fundamental implications inherent in inventory asset information. Prior papers often assume the efficient market and they view the significant relation between stock prices and financial indicators as evidence of the contribution of such indicators to future earnings. Leading indicators are attracting the market's attention for equity valuation. We study whether one leading indicator (unexpected Inventories) forecasts future earnings, and whether market participants fully reflect the predictive ability when they sets share prices(Mishkin test, 1983). Our empirical results of the study are summarized as follows. Current unexpected inventory investment is negatively associated with future operating performance. Also, our evidence is that the stock market participants overprice the contribution of unexpected inventory investment when predicting future earnings. Furthermore, a hedge strategy that uses the overpricing gives significant future abnormal returns. The overall results help the users of financial reports, researchers of accounting, and the accounting principle setting body.

• Proceedings of the Korea Contents Association Conference
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• 2005.11a
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• pp.590-595
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• 2005

RFID is rising as a means which recognizes products efficiently and correctly. The use of RFID technology can reduce the expense of excess stocktaking, forgery, labor and improve supply network. RFID technology uses RF to recognize the products. EPC, a small tag, is attached to each product, which includes specific product information. Each EPC is only one and can recognize each product. If EPC tag moves to a specific location, the reader reads the tag, the data of which get to be stored in EPC information service, a data storage system. All services can approach EPC information service through web and whenever users demand services, they are provided with the data they want. This study shows an inventory control system is implemented by EPC information service.

• The Korean Journal of Financial Management
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• v.14 no.3
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• pp.1-21
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• 1997

본 연구는 가치창조 경영의 중심지표인 EVA가 우리나라에서도 올바른 주주가치 평가지표로서 활용될 수 있을지를 살펴보고 있다. 실증분석 결과를 보면 연구기간(1986년${\sim}$1995년)중 대부분의 기업은 주당 EVA가 음(陰)이였고, 주당 EVA는 주당영업 이익, 주당순이익, 자기자본이익률등 기존 성과 척도들에 비해 주가와 상관관계가 가장 높았다. 연도별 EVA를 기준으로 매년 포트폴리오를 재구성하는 방법으로 10년간의 초과 수익률을 계산한 결과 EVA가 양(陽)인 포트폴리오는 음(陰)경우보다 초과수익률이 거의 140%정도 높았다. 또한 당해연도 뿐 아니라 전년도 주당 EVA가 주가변동의 주요결정 요인인것도 발견되었다. 이러한 연구결과는 EVA의 극대화가 주가의 극대화 곧 기업가치 및 주주가치 극대화를 의미하므로 성과지표로서 EVA를 성과측정 및 보상등 기업의 모든 의사결정에 활용할 수 있다는 것을 시사해 준다. 또한 EVA를 포트폴리오 관리를 위한 새로운 투자지표로 활용한다면 증권시장에서 수익률을 재고할 수 있다는 것을 입증해줌으로써 증권시장의 활성화에 크게 기여할 수 있을 것이다.

• Journal of Korean Library and Information Science Society
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• v.54 no.3
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• pp.81-104
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• 2023

This study is a case study in which collection performance evaluation was attempted using key performance indicators presented by EBSM or collectionHQ, taking three public libraries located in Geumjeong-gu, Busan as examples. Focusing on the collection performance evaluation, which evaluates the performance of the collection, not only the evaluation of individual libraries, but also the differences in the evaluation results of libraries were reviewed. The key performance indicators used are grubby items, dead items, popular author provision, popular subject provision, overstocked subject areas and understocked subject areas. The main analysis results are as follows. First, in the evaluation of the grubby items, the ratio of grubby items out of all items in all three libraries was low. Second, in the case of all dead items, the ratio was high in all three libraries, It exceeded the base value suggested by collectionHQ. Third, the Top 10 popular authors were identified, and there were differences among libraries. Fourth, in the evaluation of provision of popular subject areas, all three libraries had almost no popular subject areas. Fifth, in the evaluation of overstocked subject areas, there was no overstock at Geumsaem Library, but many at Geumjeong Library and Seodong Library. Sixth, in the subject area evaluation of understocked inventory, only Geumsaem Library showed a lack of inventory.

• Information Systems Review
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• v.19 no.2
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• pp.71-94
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• 2017

Recommender systems reduce information overload and enhance choice quality. This technology is used in many services and industry. Previous studies did not consider recommendation quantity and the repetitive recommendations of an item. This study is the first to examine recommender systems by considering recommendation quantity and repetitive recommendations. Only a limited number of items are displayed in offline stores because of their physical limitations. Determining the type and number of items that will be displayed is an important consideration. In this study, I suggest the use of a user-based recommender system that can recommend the most appropriate items for each store. This model is evaluated by MAE, Precision, Recall, and F1 measure, and shows higher performance than the baseline model. I also suggest a new performance evaluation measure that includes Quantity Precision, Quantity Recall, and Quantity F1 measure. This measure considers the penalty for short or excess recommendation quantity. Novelty is defined as the proportion of items in a recommendation list that consumers may not experience. I evaluate the new revenue creation effect of the suggested model using this novelty measure. Previous research focused on recommendations for customer online, but I expand the recommender system to cover stores offline.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.15 no.1
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• pp.65-82
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• 2017

The result of a preliminary safety assessment that was completed by applying the radionuclide inventory calculated on the basis of available data from radioactive waste generation agencies suggested that many difficulties are to be expected with regard to disposal safety and operation. Based on the results of the preliminary safety assessment of the entire disposal system, in this paper, a unit package exceeding the safety goal is selected that occupies a large proportion of radionuclides in intermediate-level radioactive waste. We introduce restrictions on the amount of radioactivity in a way that excludes the high surface dose rate of the package. The radioactivity limit for disposal will be used as the baseline data for establishing the acceptance criteria and the disposal criteria for each disposal facility to meet the safety standards. It is necessary to draw up a comprehensive safety development plan for the Gyeongju waste disposal facility that will contribute to the construction of a Safety Case for the safety optimization of radioactive waste disposal facilities.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.18 no.6
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• pp.133-145
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• 2023

This paper examines whether investors have adapted to the venture capital(VC) investment style. VC firms invest in privately held companies and generate returns by selling them after the lock-up period expires. We analyze the impact on stock prices before and after the lock-up period expiration, and compare the Cumulative Abnormal Return(CAR) between the past period(2015-2017) and the recent period(2020-2022) to investigate the effect of the second venture boom. The main findings are as follows. First, unlike in the past, stock price returns around the lock-up period expiration have been lower than the KOSDAQ index in recent years. Second, the impact on stock prices is significant for both 1-month and 12-month lock-up periods. Specifically, it is confirmed that stocks held by venture capital and professional investors with a 1-month lock-up period respond in advance to their information after the second venture boom. Finally, we find that there is a difference in CAR depending on whether or not the company received VC investment after the second venture boom. Based on our findings, we suggest that VC firms need to revise their exit strategies to improve performance. This includes finding ways to reduce information asymmetry and fees, as well as developing strategies to mitigate market volatility. Additionally, the current lock-up period for VCs should be reconsidered as it may increase the risk of stock price decline. We recommend that the government revise the scope and duration of lock-up periods to protect investors after IPO.