• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제5B권4호
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• pp.374-381
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• 2005

The ability to provide quality power has become a significant issue in power systems. The main causes of poor power quality are harmonic currents, poor power factor, supply-voltage variations, etc. A technique of achieving both active current distortion compensation, power factor correction and also mitigating the supply-voltage variation (sag or swell) at the load side is presented in this paper. The operation and rating issues of the proposed Single-phase Unified Power Quality Conditioner are also highlighted. To reduce the total cost while simultaneously increasing the performance, the system is fully digitally controlled using the fixed-point TMS320F240 digital signal processor. The performances of the UPQC, which is composed by shunt and series PWM controlled-converters, have been verified on a laboratory prototype.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제5B권4호
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• pp.312-316
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• 2005

The single phase induction motor has been commonly applied to small-sized electrical appliances because of its low cost, but it has low efficiency and large torque ripple, and it is incapable of speed control. However, two-phase induction motors have small torque ripple, high efficiency and variable speed control, because they are inverter fed. In this paper, the dynamic characteristics of the two-phase induction motor, such as the torque ripple, current and speed, are analyzed by using the time-stepping finite element method, and compared with the cage-type single phase induction motor.

• 경영과학
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• 제16권2호
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• pp.93-108
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• 1999

There seems to be a renewed interest in interorganizational relationship to search ofr strategic information partnerships. It is particularly noteworthy that no study has yet reported configurations at the level of interorganizational relationships nor compared such configurations across different types of IOS(interorganizational Infromation System). This paper seeks to uncover dominant configurations of interorganizational relationships across the various types of IOS. We integrate relevant theoretical concepts from transaction cost economics, organization theory and political economy to develop a conceptual model of interorganizational relationships based on the fit between information processing needs and information processing capabilities. We empirically uncover a set of hypothesis toward the patterns of interorganizational relationships. Moreover the implications for further research pertaining to the logic and development of configurations were proposed.

• 한국경영과학회지
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• 제29권1호
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• pp.17-30
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• 2004

There seems to be a renewed interest in Interorganizational relationship to search for strategic information partnerships. It is particularly noteworthy that no study has yet reported conflgurations at the level of interorganizational relationships nor compared such configurations across different types of ISO(interorganizational system). This paper seeks to uncover dominant configurations of interorganizational relationships across the various types of ISO. We Integrate relevant theoretical concepts from transaction cost economics, organization theory and political economy to develop a conceptual model of interorganizational relationships. We empirically uncover a set of hypothesis toward the patterns of interorganizetional relationships. Moreover the implications for further research pertaining to the logic and development of configurations were proposed.

• Asia pacific journal of information systems
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• 제13권1호
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• pp.23-46
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• 2003

Today ordinary consumers have the option of buying the products/services through Internet commerce, home shopping, or traditional commerce. This study compares the means-ends objective measures comprising the customer satisfaction with each type of commerce. Means objective variables consist of product variety, impulsive buying, comparison shopping, product information, and accuracy of transaction. Ends objective variables include convenience, safety, time saving, cost reduction, and shopping enjoyment. Results of data analysis indicate that ends objective variables are directly related with the behavioral intention of customers, and that each type of commerce has its own pros and cons which in turn provides the basis for differentiated customer satisfaction.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권6호
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• pp.2043-2055
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• 2014

This paper empirically investigates the effects of technology licensing on the licensee firm's performance with the help of a unique data set of observed licensing transactions in Information and Communication Technology (ICT) industry. We examine how intensity of licensing participation as a licensee affects the firm's performance. This study also analyzes how relationship between the licensor and the licensee in a deal along with characteristics of participants and their industry influences the performance of the licensee firm. The findings suggest that frequent participation in technology licensing increase licensee firm's sales growth. Also, transaction cost considerations and technology spillovers are important explanatory factors that influence licensee firms' performance in licensing.

• 한국데이타베이스학회:학술대회논문집
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• 한국데이타베이스학회 2008년도 연합학회학술대회
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• pp.487-491
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• 2008

After 1990, Korean information technology industry was developed enormously. To estimate these situation, there were many studies such as based on resource based view, transaction cost theory, and so on. These studies were focused on the efforts of company itself and the main body of development were the company not environmental factors. But in developing countries such as Korea, environment which is government policies, other companies, etc. is important factor. So present study estimate the environmental factors for evolution of Korean IT industry with population ecology concept.

• Asia pacific journal of information systems
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• 제10권2호
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• pp.125-147
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• 2000

The objective of this paper is to propose additional features for the success of the Internet-based stock trading companies in Korea which attempt to improve competitiveness in the stock trading market. Literature about this issue has been rarely reported. To clarify our research intention, therefore, we surveyed 24 stock trading companies which support the Internet-based stock trading systems, and gathered data about appropriate Internet business model which is deemed promising and effective in the future. Analysis results revealed that besides cheap trading transaction cost, those additional features such as convenience, reliability, speed delay, superiority, and profitability are also important as well for the success of the Internet-based stock trading.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 하계학술대회 논문집 C
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• pp.1628-1632
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• 1994

KEPCO is now promoting the new project of upgrading its highest system voltage from 345kV to 765kV. The main reason of this project is an insurance of bulk power transmission from power complexes at coast to power demand center at Kyoung-In area. The new system needs a careful approach to basic design to secure its reliability and to reduce the increase of investment cost. So, We introduced the basic philosophy of insulation design in spring meeting of this transaction. This paper, after preceding paper, deals with the insulation design example for 765kV transmission lines.

• 한국정보과학회논문지:소프트웨어및응용
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• 제26권1호
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• pp.80-80
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• 1999

As Temporal DataBase Systems(TDBSs) manages both the historical versions and the current version of each data item, a temporal transaction may access more data records than atransaction in traditional database systems. Hence, the concurrency control subsystem of temporaldatabase management system should be able to correctly and efficiently detect actual conflicts amongconcurrent temporal transactions while the cost of detecting conflicts is maintained in low levelwithout detecting false conflicts which cause severe degradation of system throughput.In this paper, Two-Level Conflict Detection(TLCD) scheme is proposed for efficient conflictdetection between concurrent temporal transactions in TDBs. In the proposed TLCD scheme, sincechecking conflict between concurrent temporal transactions is performed at two levels, i, e., logicallevel and physical level, conflicts between concurrent temporal transactions are efficiently and correctlydetected,Furthermore, we also evaluate the performance of the proposed TLCD scheme with those oftraditional conflict detection schemes, logical-level conflict detection scheme and physical-level conflictdetection scheme by simulation approach, The result of the simulation study shows that the proposedTLCD scheme outperforms the previous conflict detection schemes with respect to the averageresponse time.