• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.701-702
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• 2006

In this paper, we embodied the environment monitoring system that can acquire correct data in real-time. And we used module that is 2.4GHz IEEE 802.15.4 / Zigbee network for radio communication between nodes. The nodes sense the data of temperature, humidity, illumination periodically. The nodes store the data in their buffer and transmit. We confirmed that the system is in real-time as it is changed instantly due to the varying environment by the simulation Therefore, we can construct the efficient and correct system as applied this system to monitor the environment.

• 한국컴퓨터정보학회논문지
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• 제6권3호
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• pp.29-34
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• 2001

통신시장에서 경쟁은 증가되고 있다. 효과적 고객 유지 전략은 고객이탈의 명확한 기초에 있다. 데이터 마이닝 제공자는 고객에 보다 더 가까이 가기 위한 기회를 엄청난 제공한다. 특히 뉴럴 네트워크를 이용한 CRM분석으로 통신서비스 시장분석을 하였다. 이 논문의 데이터 마이닝을 이용한 고객이탈취급과 고객이탈분석으로 이루어졌다. 과거에 수집된데이터로부터 반복적인 학습과정을 거쳐 데이터에 내재되어 있는 패턴을 찾아내는 고객 이탈방지 모델을 인공 신경망을 통해 구축하였다.

• Progress in Superconductivity
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• 제3권1호
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• pp.83-86
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• 2001

We have fabricated a single flux quantum 4-stage shift register with interface-controlled $Y_1$$Ba_2$$Cu_3$$O_{7-x}$(YBCO) Josephson junction. The YBCO Josephson junctions showed RSJ-like current-voltage(I-V) curves at temperatures 45~80K. We tested load and shift operation of shift register with binary data sequences “1000”, “1010”, “1011”, and “1111” at 58K. For all the binary data sequences, the shift register operated successfully. By operating the circuit with proper current pulses, we observed no errors during at least 12 hours operation for all the data sequences.s.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1987년도 전기.전자공학 학술대회 논문집(II)
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• pp.1018-1021
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• 1987

This describes the standardization plan of data format (track 2) in magnetic stripe card and message format between terminal and host computer. The track 2's data format is composed of PAN and additional data based on ISO 3554. In the present social status of Korea, the VISA B message format is recommended.

• 품질경영학회지
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• 제44권4호
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• pp.921-934
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• 2016

Purpose: The purpose of this study was to propose useful suggestions by explore the effects of the Mobile Telecommunication service quality on customer satisfaction and Customer Loyalty (Focus on Moderation effect of switching barrier) in Korea Mobile Telecommunication industry. Methods: After reviewing the literature, the structural eqation modeling(SEM) conducted by LISREL 8.53 test the research model. The data was collected from subscriber of mobile telecommunication service by the questionare in Korea. Results: The results of SEM show that Mobile Telecommunication Service Quality have a positive effect on customer satisfaction, and customer satisfaction also have a positive effect on customer loyalty. And switching barrier have a moderation effect between customer satisfaction and customer loyalty. Conclusion: Mobile Telecommunication Service Quality is highly related to Customer Satisfation and Customer Loyalty, so Mobile Telecomunication Company should improve Service Quality especially price-related service quality and process/ human- related service quality. And the company need to get higher the positive Switching Barriers in order to improve Customer Loyalty.

• Journal of the Optical Society of Korea
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• 제18권2호
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• pp.146-150
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• 2014

We propose an experimental holographic imaging scheme combining compressive sensing (CS) theory with digital holography in phase-shifting conditions. We use the Mach-Zehnder interferometer for hologram formation, and apply the compressive sensing (CS) approach to the holography acquisition process. Through projecting the hologram pattern into a digital micro-mirror device (DMD), finally we will acquire the compressive sensing measurements using a photodiode. After receiving the data of two holograms via conventional communication channel, we reconstruct the original object using certain signal recovery algorithms of CS theory and hologram reconstruction techniques, which demonstrated the feasibility of the proposed method.

• ETRI Journal
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• 제32권2호
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• pp.302-311
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• 2010

In this study, we analyzed consumers' choices of various broadcasting and telecommunication convergence services and time consumption for chosen services by using survey data. A multivariate probit model was used to model consumers' choices of various broadcasting and telecommunication convergence services, and an ordered probit model was used to model consumers' time consumption for chosen services. Factors affecting consumers' choices and time-consumption behavior were identified, and simulation results of market competition and substitution were obtained. Based on these results, it was found that for the time being, consumers are highly locked into existing broadcasting services and are likely to become more price-sensitive to the new broadcasting and telecommunication convergence services. Also, the ways in which individual characteristics affect choices and time consumption were found to be very diverse service by service.

• Journal of Information Technology Applications and Management
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• 제14권3호
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• pp.199-225
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• 2007

This study deals with the regulatory policy of government on the convergence of broadcasting and telecommunication by applying rent seeking theory to Internet Protocal TV (IPTV). Existing literature has mainly focused on the negative implications of rent seeking since Tullock [1967], Krueger [1974] and Buchanan [1980]. We have investigated the regulatory policy along with the progress of the convergence of broadcasting and telecommunication. Regulatory policy on broadcasting, despite its impartial intent. has created the entry barrier in the industry, resulting in high rents. Meanwhile, regulatory policy in telecommunication is more geared by the encouragement of more competitive environments, resulting in reasonably low rents in the market. Regulatory policy in the age of convergence needs to improve the efficacy of the industry and welfare, while maintaining the rent at a reasonably low level. This research has contributed to emphasizing the positive aspect of rent seeking in policy concerned with the convergence of broadcasting and telecommunication, notably IPTV.

• 한국통신학회논문지
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• 제28권8A호
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• pp.650-656
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• 2003

In 1995, a group of representatives from the integrated circuits and computer-aided design industries presented a industry standard bipolar model called the VBIC model. The VBIC model includes the improved Early effect, quasi-saturation, substrate parasitic, avalanche multiplication, and self-heating which are not available in the conventional SGP model. This paper applies VBIC model for SiGe HBT device and develops an accurate and efficient methodology to extract all the DC and AC parameters of the VBIC model for SiGe HBT device at room temperature. Simulated results by the extracted VBIC model parameter are compared with the measurement data and show very good agreement in both DC and s-parameters prediction.

• 정보통신설비학회논문지
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• 제3권2호
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• pp.81-89
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• 2004

In this paper, we describe ubiquitous environments and the trend of convergence that is an evolution path of. current telecommunication, and show the concept of broadband convergence network, service feature and evolution path. In order to converge wire and wireless communication, telecommunication and broadcasting, voice and data efficiently, broadband convergence network divides a network into service layer, control layer, transport layer, ubiquitous access and terminal layer. Broadband convergence network will be a network that can provide and control broadband multimedia services with QoS and security of different and customized level. Then we depict characteristics and types of broadband multimedia service, and describe the characteristic of broadband convergence network. Finally, we show ubiquitous network based on the broadband convert- gence network to provide ubiquitous service which is a future telecommunication service. We also describe requirements of ubiquitous network such as an intelligent and context based platform, convergence terminals, ubi- quitous computing devices, etc.