• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.21 no.5
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• pp.397-401
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• 2008

Most of the topic in PCB industry was about increasing the volume of product for the development of electronics in numerous industrial application area. However, it has been emerged that yield improvement quality manufacturing via detecting any suspicious process in order to minimize the scrapped product and material waste. In addition, recently, restriction of hazardous substances (RoHS) claims that electronic manufacturing environment should reduce the harmful chemicals usage, thus the importance of monitoring copper etchant and detecting any mis-processing is crucial for electronics manufacturing. In this paper, we have developed real-time chemical monitoring system using RGB sensor, which is simpler but more accurate method than commercially utilized oxidation reduction potential (ORP) technique. The developed Cu etchant monitoring system can further be utilized for copper interconnect process in future nano-semiconductor process.

• Journal of the Korea Computer Industry Society
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• v.3 no.3
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• pp.363-368
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• 2002

Electronic commerce system must provide information satisfying customers. To do this, many kinds of studies are being advanced actively about electronic commerce support system using intelligent agent technology. This paper suggests electronic commerce system using intelligent multi agent based on Case base and Log analysis. This system can provide suitable information to customers by using knowledge and traffic and system information analysis.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.1129-1132
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• 2012

최근 환경보호를 위한 그린IT 기술이 주목을 받으면서 정부차원의 스마트 그리드가 부각되고 있다. 스마트 그리드는 궁극적으로 전력을 효율적으로 사용하여 소비자는 전력사용 요금을 절감하고 정부는 환경을 보호할 수 있게 된다. 하지만, 정부 차원에서의 일방적인 전력관리에는 한계가 있고 전력을 소비하는 사용자 역시 능동적으로 전력 사용량을 줄여야 큰 효과를 볼 수 있다. 따라서 본 논문은 임베디드 센서네트워크를 기반으로 일반 사용자도 댁내에서 혹은 빌딩에서 능동적으로 사용할 수 있는 스마트 전력절감 시스템을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.1133-1135
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• 2012

본 논문에서는 IEEE 802.15.4 Zigbee 통신기술을 이용하여 센서 네트워크를 구성하고 사용자의 위치를 사용자가 소지한 Zigbee 동글로부터 수신된 단말 정보와 사용자의 미디어 히스토리 정보를 기반으로 모바일 디바이스와 PC와 같은 디스플레이 자원에서 개인화된 멀티미디어 콘텐츠 이어보기 서비스를 제공하는 서비스 플랫폼을 제안하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.1227-1230
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• 2012

본 논문에서는 IEEE 802.15.4(ZigBee, 지그비)통신기술과 채널 선택(Channel selection)기술을 활용하여 객체가 소지한 능동형 태그의 주기적 비컨신호로 위치를 인식, 추적하여 서버에게 트래킹 정보를 제공해주는 시스템으로써 위치기반 개인화 플랫폼을 구현하였고 효율적인 위치 인식 플랫폼을 위한 코디네이터의 위치 선정에 대한 성능을 평가하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.1150-1153
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• 2012

전화를 이용하여 원격의 장치를 모니터링하고 제어하는 시스템 중 본 논문에서는 IP-PBX(private branch exchange)기반 서비스 플랫폼을 응용서비스를 실제 구현하여 전화응용서비스 개발의 필수적인 몇 가지 요소로써 IP-PBX, 서비스 서버, TTS(Text to Speech) 서버 등을 선정하며 IVR(Interactive Voice Response)시스템을 설정하기에 많은 시간과 비용이 들기에 ZigBee 디바이스 모니터링 및 제어를 위한 IP-PBX 트리 구조 인터페이스를 제안한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.13 no.3
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• pp.1199-1212
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• 2019

This paper proposes two wideband spectrum sensing approaches: (i) method A, the cumulative sum (CUSUM) algorithm with short-time Fourier transform, taking advantage of the time-frequency analysis for wideband spectrum. (ii)method B, the quickest spectrum sensing with short-time Fourier transform and compressed sensing, shortening the time of perception and improving the speed of spectrum access or exit. Moreover, method B can take advantage of the sparsity of wideband signals, sampling in the sub-Nyquist rate, and it is more suitable for wideband spectrum sensing. Simulation results show that method A significantly outperforms the single serial CUSUM detection for small SNRs, while method B is substantially better than the block detection based spectrum sensing in small probability of the false alarm.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.37 no.2
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• pp.133-140
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• 2024

This study offers a comprehensive evaluation of the role and impact of advanced power semiconductors in solar module systems. Focusing on silicon carbide (SiC) and gallium nitride (GaN) materials, it highlights their superiority over traditional silicon in enhancing system efficiency and reliability. The research underscores the growing industry demand for high-performance semiconductors, driven by global sustainable energy goals. This shift is crucial for overcoming the limitations of conventional solar technology, paving the way for more efficient, economically viable, and environmentally sustainable solar energy solutions. The findings suggest significant potential for these advanced materials in shaping the future of solar power technology.

• Management & Information Systems Review
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• v.37 no.2
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• pp.63-85
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• 2018

Electronic displays have developed as instruments that function as windows of information to satisfy the bidirectional needs of electronic device manufacturers and users. The cathode-ray tube (CRT) display once dominated the display industry. Now, the liquid crystal display (LCD) is dominant, and promising displays are competing to become the next-generation display. Displays reflect the characteristics of the information and communication technology (ICT) industries, such as technological changes, innovative features, and competitive dynamics, and have technologically evolved to dominate the industry and market through various ICT devices. This research utilizes a dominant design concept and examines the case of the flat-panel display industry to propose a comprehensive framework, which considers technological, organizational, and environmental characteristics, of the determinants influencing dominance in the technology-intensive ICT industry. The results show that a dominant design in the flat-panel display industry emerges from technological competition among several designs, based on technological characteristics and market acceptance, and dominates the industry and market by various environmental factors. Our results emphasize the difference between generic technologies and the speed of technological innovation and expand the understanding of the emergence of a dominant design. Furthermore, this paper suggests practical implications for establishing a competition strategy and strategic guidance for other ICT industries as well as the display industry.

• Knowledge Management Research
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• v.16 no.1
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• pp.71-93
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• 2015

With the rapid growth of the internet, electronic commerce has become accepted as one of the major purchasing channels for consumers. As more and more consumers search for and purchase products through the internet, intra-industry competition of electronic commerce has become fierce. Therefore, electronic commerce service providers pay attention to factors that prevent existing customers from leaving there services in the service failure situation. In this regard, electronic commerce service providers should make service recovery efforts for consumer recovery satisfaction after service failure. In this study, we suggest that procedural justice, interactional justice, distributive justice and authenticity have positive impacts on recovery satisfaction. In addition, we also propose that involvement plays moderating roles in the relationships between procedural justice, interactional justice, distributive justice, authenticity and recovery satisfaction. We collected empirical data for this study over a period of two weeks from subjects who had service failure recovery experiences through electronic commerce. A total of 224 complete and valid responses were obtained. We carried out data analysis using a two-step methodology with SPSS 20.0 and SmartPLS 2.0. The first step in the data analysis was to establish the internal consistency, convergent validity, discriminant validity of the constructs. In the second step, we examined the structural model. The empirical results support the proposed model and partly identify the moderating effect of involvement differences. The moderate effect results show that procedural justice, distributive justice and authenticity have different impacts on recovery satisfaction in two groups. Cognitive factor such as the procedural justice and distributive justice have stronger impacts on recovery satisfaction in the high-involvement goods than in the low-involvement goods, while emotional factor such as authenticity has a stronger impact on recovery satisfaction in the low-involvement goods than in the high-involvement goods. We expect that this result will provide researchers and managers who are interested in electronic commerce service failure recovery with useful theoretical and practical implications.