• Journal of the Optical Society of Korea
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• v.10 no.4
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• pp.169-173
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• 2006

This paper describes an efficient optimal design method for an arrayed waveguide grating (AWG) having MMI coupler with flattened transfer function. The objective function is the norm of the difference between calculated and target spectra. To analyze the AWG transfer function, the Fresnel-Kirchhof diffraction formula was employed and the design variable was optical path difference of each array waveguide. The (1+1) Evolution Strategy was applied to an eight-channel coarse wavelength division multiplexing (CWDM) AWG as the optimization tool. For obtaining a broadened spectrum, we use a MMI coupler and the variation in optical path difference at each array waveguide changes the shape of the transfer function to obtain the optimal spectrum shape.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.10a
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• pp.603-606
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• 2015

The post-production of smart farming defines the stage that the final products are delivered from producer to consumers via market on ICT network. It deals with the process of product packaging and distribution from producer to consumer with marketing strategy. This focus on reference model for post-production service including specialization, centralization of product delivery, and just-in-time delivery, and marketing system on the network. It defines a significant function component on post-production stage. The producer plays a significant role in economy being one of the main contributors to the many customers. This articles suggest the effective product distribution service which requires delivering the right product, in the right quantity, in the right condition, to the right place, at the right time, for the right cost, and encompassing global marketing based on ICT network, will be provided[1].

• Journal of the Optical Society of Korea
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• v.10 no.1
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• pp.33-36
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• 2006

This paper describes an efficient optimal design method for an arrayed waveguide grating (AWG) with flattened transfer function. The objective function is the norm of the difference between calculated and target spectra. To analyze the AWG transfer function, the Fresnel-Kirchhof diffraction formula was employed and the design variable was optical path difference of each array waveguide. The (1+1) Evolution Strategy was applied to an eight-channel coarse wavelength division multiplexing (CWDM) AWG as the optimization tool. The optimized transfer function will considerably improve the system performance.

• Journal of Information Technology Applications and Management
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• v.16 no.1
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• pp.21-36
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• 2009

As the World Wide Web (WWW) has become a major channel for information delivery, the data accumulated in the Internet increases at an incredible speed, and it derives the advances of information search technologies. It is the search engine that solves the problem of information overloading and helps people to identify relevant information. However, as search engines become a powerful tool for finding information, the opportunities of plagiarizing have increased significantly in e-Learning. In this paper, we developed an online plagiarism detection system for detecting plagiarized documents that incorporates the functions of search engines and acts in exactly the same way of plagiarizing. The plagiarism detection system uses morpheme analysis to improve the performance and sentence-based comparison to investigate document comes from multiple sources. As a result of applying this system in e-Learning, the performance of plagiarism detection was improved.

• Journal of Information Technology Applications and Management
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• v.16 no.1
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• pp.169-183
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• 2009

The purpose of this research, based on the Media Selection Theory, the Technology Acceptance Model, and the Social Influence Theory, is to investigate the influential factors that affect media selection in banking transactions. Analyses showed that for location sensitive bank windows and ATMs(automatic teller machines), defined as offline-based transaction channels, convenience was the variable affecting media selection. However, in the case of online media not related to location, (phone banking, internet banking, and mobile banking) reliability was the significant variable influencing use. The findings show that banking organizations may benefit from identifying traits of media affecting use, and should differentiate customer services for competitive advantage.

• Journal of Information Technology Applications and Management
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• v.21 no.3
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• pp.19-33
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• 2014

Crowdsourcing is a popular tool for firms to harness external knowledge and resources. One variation of crowdsourcing entails the use of corporate channels in social network services (SNS) such as Twitter to hold public idea competitions. This study examined the role of feedback interaction between participants of idea competitions. More specifically, the study examined the impact of incentives to provide feedback on other participants' ideas. We found that idea competitions where explicit incentives were introduced to elicit crowdsourced feedback in the form of qualitative comments resulted in improved idea generation performance-with more ideas generated overall, and more ideas generated through participant collaborations, through increased comment-posting activities. Based on the findings, implications for theory and practice are discussed.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.9A
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• pp.1525-1534
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• 2001

국내 통신사업자들이 xDSL 등 초고속 인터넷 액세스 서비스를 왜곡된 요금구조로 경쟁적으로 보급함에 따라 급속히 확산되고 있으나, 엄밀히 원가를 감안한다면 여전히 AO/DI는 인터넷 트래픽 폭증으로 인한 전기통신망의 과부하를 통신사업자가 경제적이며 효과적으로 대처할 수 있는 현실적인 대안이라 할 수 있다. 본 논문은 AO/DI의 동적 채널 할당 및 해지에 있어서 VIA가 권고한 정책보다 효율적으로 대역폭을 할당, 해지할 수 있는 알고리즘을 제안한다. 관찰 시점까지의 누적된 트래픽의 양과 변화를 감안하여 평균 트래픽과 분산을 추정함으로써 트래픽의 변화에 적응하여 채널 할당, 해지 시점을 결정할 수 있으며 트래픽 특성에 따라 매개 변수의 조정을 통하여 D 채널, B 채널의 이용률을 제어할 수 있고 평균 대기시간 등의 성능을 최적화할 수 있음을 보인다. 또한, 이를 기초로 응용 프로토콜을 감지하여 응용이 갖는 고유의 트래픽 특성과 요구사항에 적합한 채널 할당/해지 방안도 제시한다.

• Proceedings of the Korea Database Society Conference
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• 2000.11a
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• pp.63-66
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• 2000

컴퓨터를 이용한 인터넷의 발전으로 웹 코스웨어의 교육에 응용하려는 많은 사람들이 지속적으로 증가되어가고 있다. 이는 인터넷 이용자들이 쉰 상에서의 원격교육에 관한 필요성이 커지고 있으며, 이를 실세계에 다양한 방법 이용하여 보다 효율적인 교육을 위해 다양한 교육 툴들이 연구되어지고 있다 인터넷을 이용한 웹 코스웨어의 교육은 시공간을 초월하여 여러 곳에 떨어져 있는 학습자들의 자기 주도적인 학습목표를 달성시키기 위한 목적으로 개발 및 구현되었다. 그러나 이를 사용하기 위해서는 사용자의 시스템이 정보를 제공하는 서버와의 정보 교환을 위해 통신이 항상 서로 교류하고 있는 상태를 유지해야하고, 사용자가 새로이 갱신된 학습정보를 접속하기 위해서는 서버에 항상 찾아가 정보를 찾아 접속해야만 갱신된 정보를 확인할 수가 있었다. 본 연구는 이를 반영하여 XML(extensible Markup Language)을 기반으로 한 웹 캐스팅기법으로 웹 코스웨어를 구연하였으며, 이를 적용하기 위해 CDF(Channel Definition Format)형식을 사용하였다. 채널을 사용하여 학습자의 자율적으로 채널을 선택하면 새로이 갱신된 정보가 자동적으로 학습자의 시스템에 저장되도록 구현하였다.

• Journal of the Korean Society of Clothing and Textiles
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• v.26 no.8
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• pp.1239-1247
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• 2002

Consumers' purchase intention related with price reduction is important factor for the successful marketing strategy of electronic commerce as a new marketing channel. Therefore, the purpose of this study was to assess the difference of consumers' attitude(purchasability and perceived need) depending upon purchasing variables, and to investigate how consumers' attitude influence on purchase intention with price reduction in the internet shopping mal1. For research method, 400 questionnaires were distributed to subjects who were 20 to 39 years old; and among the returned questionnaires 347 were usable. Data were analyzed by t-test, regression analysis, frequency with SPSS 10.0. Results of this study were as follows: First the results showed that purchasability and Perceived need affect Purchase intention according to off-price percentage, and brand and clothing style in discount. Second, there were significant differences in purchasability, and perceived need according to off-price percentage, and brand in discounts. However, there were no significant differences in purchasability and perceived need according to clothing style in discounts.

• Journal of Korean Institute of Industrial Engineers
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• v.27 no.2
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• pp.181-189
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• 2001

The proliferation of the Internet and related technologies and applications has led to a new form of market place known as the electronic store. In this paper, we study competition between two shopping channels, an electronic store and traditional retailers. Based on the circular spatial market model, we derive the Nash and Stackelberg equilibria as a function of the efficiency of the electronic store. The result shows that the Stackelberg equilibrium is always superior to the Nash equilibrium for both channels. It is also shown that, in some cases, the electronic store has incentive to decrease its efficiency to gain more profit.