• 제목/요약/키워드: IT portfolio

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The Effects of Blockholder Diversity on the Firm Risk: Evidence from Korea

  • KIM, Hung Sik;CHO, Kyung-Shick
    • The Journal of Asian Finance, Economics and Business
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    • 제8권12호
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    • pp.261-269
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    • 2021
  • This study examines the effect of block diversity on the risk of firms listed on the Korean Stock Exchange between 2010 and 2017. To examine the effect of block diversity on corporate risk, we measure block diversity in terms of a single component, portfolio size, by referring to prior literature. This diversity component accounts for the differences in portfolio size across corporate blocks. In line with existing research on corporate risk, we consider several variables to measure corporate risk: volatility, beta, and idiosyncratic risk. The results show a negative relationship between the size of a block shareholder's portfolio and corporate risk. We also show no difference in the effect of block diversity on the corporate risk between KOSPI and KOSDAQ. This implies that the difference in portfolio size among corporate blocks reduces corporate risk. This may be due to the effect of inter-block monitoring activities in the Korean securities market, which benefits from block diversity. This empirical result supports previous studies that predicted that block diversity would have beneficial influences on firm monitoring in general. This study is significant in that it analyzes the relationship between block diversity and firm risk and provides relevant information to business practitioners and investors.

중점기술 선정을 위한 관계분석형 R&D 포트폴리오 방법 (Relationship-type R&D Portfolio Method for Selection of Core Technology)

  • 감혜미;서민우;김찬수
    • 한국산학기술학회논문지
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    • 제19권6호
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    • pp.677-682
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    • 2018
  • 관계분석형 R&D 포트폴리오 방법은 중점기술의 선정기준이 독립적일 경우 각 선정기준의 고유한 목적과 특성을 반영하여 중점기술을 선정하는 방법이다. 본 연구는 중점기술을 도출하기 위한 방법으로 관계분석형 R&D 포트폴리오 방법을 제시하고 선정기준과 분석지표간의 상관관계 분석하는 1단계, 각 선정기준에 최적으로 부합하는 포트폴리오 매트릭스를 구성하는 2단계, 중점기술을 도출하는 3단계로 나누어 방법론을 적용하는 과정을 서술하였다. 본 연구에서는 중점기술을 선정하기 위한 4대 선정기준과 기술수준, 경제성, 기술성을 파악하기 위한 분석지표간의 상관관계를 HoQ를 응용한 표로 작성하였다. 상관관계표를 바탕으로 각 선정기준을 최적으로 만족하기 위해 고려해야 할 분석지표를 도출하였으며, 도출된 분석지표와 선정기술을 두 축으로 포트폴리오 매트릭스를 구성하였다. 4대 기준을 모두 충족하는 충족형 포트폴리오 P0와 4대 선정기준의 고유한 특성을 반영하여 각 선정기준을 효과적으로 충족하는 포트폴리오 P1~P4를 구성하여 중점기술을 도출하였다. 선정된 중점기술은 명세기반의 키워드 분석 등의 과정을 거쳐 미래 안보환경에 대응하기 위한 중점분야 선정에 활용될 수 있다.

The Use of Feedback in Written Reports and Portfolio: An Assessment for Learning Strategy

  • Santos, Leonor;Pinto, Jorge
    • 한국수학교육학회지시리즈D:수학교육연구
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    • 제14권3호
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    • pp.281-297
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    • 2010
  • This paper pretends to study the potentialities of feedback, particularly in the development of a written report in two phases and in portfolio; and the main difficulties that teachers has to face concerning this assessment practice. Through a meta-analysis concerning different studies, it is possible to say that oral or written feedback, intentionally provided to students of several ages, may enable them to develop their self-assessment capacity and to get close of the expected product. However, the type of student and his or her perceptions may influence the effectiveness of feedback. Even for experience teachers, this practice maintains complex.

RPS(Renewable Portfolio Standard) 제도 도입을 고려한 전기요금변화에 관한 연구 (A Study on the Change in Production Costs and Electricity Tariffs with the Introduction of Renewable Portfolio Standard)

  • 홍희정;한석만;김발호
    • 전기학회논문지
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    • 제58권4호
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    • pp.708-717
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    • 2009
  • Recently, Korea government decided to introduce RPS (Renewable Portfolio Standard) mechanism which requires electricity providers to gradually increase the amount of renewable energy sources such as wind, solar, bioenergy, and geothermal. As a consequence, it is expected that the long-term fuel mix would be changed to result in more expensive production and the increased production costs would be distributed to the rate payers via electricity tariffs. This paper presents the change in long-term fuel mix in year 2020 with the four RPS scenarios of 3%, 5%, 10% and 20%, and the methodologies for collecting the increased production costs through new tariff schedule. The studies on long-term fuel mix have been carried out with the GATE-PRO (Generation And Transmission Expansion Program) optimization package, a mixed-integer program developed by the Korea Energy Economics Institute and Hongik university. Three methodologies for distributing the production costs to the rate payers have also been demonstrated.

An Algorithm for Portfolio Selection Model

  • Kim, Yong-Chan;Shin, Ki-Young;Kim, Jong-Soo
    • 한국경영과학회:학술대회논문집
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    • 대한산업공학회/한국경영과학회 2000년도 춘계공동학술대회 논문집
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    • pp.65-68
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    • 2000
  • The problem of selecting a portfolio is to find Un investment plan that achieves a desired return while minimizing the risk involved. One stream of algorithms are based upon mixed integer linear programming models and guarantee an integer optimal solution. But these algorithms require too much time to apply to real problems. Another stream of algorithms are fur a near optimal solution and are fast enough. But, these also have a weakness in that the solution generated can't be guaranteed to be integer values. Since it is not a trivial job to tansform the scullion into integer valued one simutaneously maintaining the quality of the solution, they are not easy to apply to real world portfolio selection. To tackle the problem more efficiently, we propose an algorithm which generates a very good integer solution in reasonable amount of time. The algorithm is tested using Korean stock market data to verify its accuracy and efficiency.

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주식투자(株式投資)에 관(關)한 모의(模擬)게임 (Portfolio Management Game Applicable to Korean Stock Market)

  • 오성백;황학
    • 대한산업공학회지
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    • 제3권1호
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    • pp.55-59
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    • 1977
  • This paper develops a portfolio management game applicable to Korean Stock Market with an emphasis on teaching and training aid. It allows each participant to start out with a certain amount of money and pick his favorable stocks from a list of stocks chosen by instructor. Each participant must make a transaction at each time period and he gets a readout that states his individual performance, i.e., stock lists, cash on hand, net worth, transactions he has made and rank in accordance with his net worth. This game package consists of 10 subprograms and 7 files written with Fortran language for use on the Nova 840 computer and is divided into 3 main categories according to their functions, i.e., book-keeping function, data processing function and information searching function. This package may be used for training portfolio decison makings in the stock market and for comparing various investment methods through hypothetical investments.

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Justification on engine information in maritime service portfolio for effective implementation of e-Navigation

  • Lee, Young-Chan;Sim, Myeong-Bo;Hong, Woo-Ram;Lee, Jae-Yeong;Jung, Byung-Gun
    • Journal of Advanced Marine Engineering and Technology
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    • 제39권10호
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    • pp.1049-1053
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    • 2015
  • This paper proposes to include engine information in Maritime Service Portfolio (MSP) for effective implementation of e-Navigation. Even though engine information is one of most important element to e-Navigation, MSP consists of mainly about navigation and communication information not included engine information. Furthermore, in reality, engine information sent from ship side such as mainly noon report and Planned Maintenance System (PMS) is too limited to make e-Navigation possibly. Therefore, Remote diagnostic structure receiving and sending data of engine information must be included in MSP for implementation of e-Navigation. Also, it has to be designed, and developed by Software Quality Assurance (SQA).

중등예비수학교사의 수업능력 향상을 위한 교수-학습 포트폴리오 활용방안 연구 (A Study on Utilization of Teaching-Learning Portfolio for Improvement of Teaching Competency of Pre-Service Mathematics Teacher)

  • 강현영
    • 대한수학교육학회지:학교수학
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    • 제16권3호
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    • pp.567-584
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    • 2014
  • 최근 교사의 전문성 중 가장 핵심이 되는 수업 전문성이 강조되고 있다. 특히 2012년 수학교육선진화 방안 발표 후 수학 교사의 수업 능력의 중요성이 강조되었다. 수학 교사의 수업능력 향상을 위해서는 예비수학교사 시기에서부터 교육 경험이 필요하다. 예비수학교사의 수업 능력 개발 및 강화를 위해서는 교육적 실행과 관련하여 자신의 실천을 체계적으로 반성하고 개선해 나아가는 경험이 필요하다. 즉, 반성적 사고와 실천적 지식의 함양을 위한 수업 실습에 관한 이론과 실천 양면의 체계적인 실행과 지도가 필요하다. 이에 따라 본 연구에서는 예비수학교사의 수업능력 향상을 위해 실행 가능한 교수-학습 포트폴리오의 구성요소 및 적용절차를 개발하였다. 또한 수업능력 향상을 위한 교수-학습 포트폴리오 작성 후 설문조사를 통하여 예비수학교사의 수업능력 향상에 효과적이었으며, 수학교사 교육을 위한 발전적인 시사점을 얻을 수 있었다.

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e-포트폴리오의 체계적인 관리와 활용을 위한 계층적 기법 (A Hierarchical Method for Systematic Management and Application of e-Portfolio.)

  • 이혜진;박찬;장영희;정지성;성동욱;유재수;유관희
    • 한국콘텐츠학회:학술대회논문집
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    • 한국콘텐츠학회 2009년도 춘계 종합학술대회 논문집
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    • pp.88-93
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    • 2009
  • e-러닝 환경에서 e-포트폴리오는 교수자와 학습자 각각 수행한 수업 및 학습에 대한 전반적인 내용을 체계적으로 관리한 결과물로, 이를 활용할 경우 교수자에게는 수업 설계 및 강의를 돕고, 학습자에게 학습결과물을 확인함으로써 자기반성의 기회를 줄 수 있어 매우 유용하다. e-포트폴리오를 생성하기 위한 방법으로는 대표적으로 교수자 및 학습자로부터 직접 수집하는 방법과 e-러닝 시스템을 통한 학습활동의 결과물로 자동적으로 수집하는 방법이 있다. 본 논문에서는 e-포트폴리오를 사용목적에 적합하게 효과적으로 구성하기 위해 데이터를 계층화 하여 분류한 후에 교수자와 학습자의 활용 목적에 맞게 상황별로 구성하여 제공함으로써 효율적인 e-포트폴리오 관리를 할 수 있고, 또한 상황별 구성방식에 대한 로직을 추가함으로써 사용자는 자신만의 e-포트폴리오를 구성할 수 있다.

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ASYMPTOTIC ANALYSIS FOR PORTFOLIO OPTIMIZATION PROBLEM UNDER TWO-FACTOR HESTON'S STOCHASTIC VOLATILITY MODEL

  • Kim, Jai Heui;Veng, Sotheara
    • East Asian mathematical journal
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    • 제34권1호
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    • pp.1-16
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    • 2018
  • We study an optimization problem for hyperbolic absolute risk aversion (HARA) utility function under two-factor Heston's stochastic volatility model. It is not possible to obtain an explicit solution because our financial market model is complicated. However, by using asymptotic analysis technique, we find the explicit forms of the approximations of the optimal value function and the optimal strategy for HARA utility function.