• Proceedings of the Materials Research Society of Korea Conference
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• 2012.05a
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• pp.60.2-60.2
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• 2012

기술의 발전이 비약적으로 성장하면서, 소비자의 요구는 빠르게 변하고 있다. 전자 소자를 응용한 제품 시장은 매해를 거듭할 수록 빠른 속도로 성능을 향상시키고 있다. 이에 따라 디스플레이 시장에서 가장 큰 관심은 작은 화면에서도 높은 해상도를 요구하고, 수광형의 구동방식이 아닌 능동형 구동방식을 갖는 AMOLED (Active Matrix Organic Light Emitted Diode)를 선호하고 있으며, 빠른 응답속도 기반을 갖는 표시소자를 요구하고 있다. 제품 생산자들의 고민은 기존의 비정질 실리콘 기반의 LCD (Liquid crystal display) 구동소자와 공정을 이용하여 소비자의 욕구에 접근하기가 점점 어려워지고 있다. 최근 이러한 문제점을 해결하고자 하는 노력들중에서 산화물 반도체 재료와 이를 이용한 박막 트랜지스터 개발이 큰 관심을 갖고 있다. 최근 InGaZnO 산화물 반도체 재료는 기존의 비정질 실리콘 반도체 재료 보다 높은 전계 이동도(> $10cm^2/V.s$)를 보이고 있으며, 비정질 실리콘 박막 트랜지스터의 구조에서 산화물 반도체 재료의 대체만으로 효과가 보일 수 있어서 큰 연구가 진행되어져 왔다. 하지만, InGaZnO 산화물 박막 트랜지스터에 대한 소자를 AMOLED에 적용할 때, 기존의 LTPS (low temperature poly-slicon)에서는 발견되지 않았던 소자의 전계신뢰성과 이동도 한계가 문제로 제기되었다. 또한, Indium이라는 희소원소의 사용은 향후 공정 단가와 희소 물질에 대한 위협등에 의하여 새로운 산화물 반도체 재료에 대한 요구와 관심이 발생하고 있다. 본 발표에서는 기존의 산화물 반도체 재료에 대한 차세대 디스플레이인 AMOLED와 유연 디스플레이에 대한 응용 가능성을 발표할 예정이다. 또한 산화물 반도체 재료의 신뢰성 문제에 대한 해결방법으로 신규 산화물 반도체 재료에 대한 연구 방향과 indium-free 계열을 이용한 저원가 산화물 반도체 연구에 대하여 소개할 예정이다. 앞으로 산화물 반도체 재료에 대한 연구와 응용은 기존의 실리콘 반도체 틀을 벗어난 새로운 응용분야를 열어줄 수 있을 것으로 기대하고 있으며, 그 기대에 대한 몇가지 예를 통하여 재료와 소자의 응용 가능성을 논의할 예정이다.

• Korean journal of communication and information
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• v.46
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• pp.9-36
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• 2009

In a competitive media environment, Internet Protocol television (IPTV) has gained appeal because of its essential characteristics, 'Internet and Interactivity'. Our study aims to explore predictors that affect IPTV-VOD adoption within the context of competing media (i.e., existing multi-channel video programming services, such as cable television and digital broadcasting satellite services). In addition, this study examines if IPTV-VOD functions as a substitute for existing multi-channel services, such as cable television and direct broadcasting satellite services. A self-report survey through face-to-face interviews was conducted in Seoul metropolitan area and other six big cities. Our findings showed that primary factors for adopting an IPTV-VOD are: age of user, subjective importance of terrestial broadcasting services, real-time terrestrial broadcasting services, and other interactive service characteristics, such as time-shifting. Also, IPTV-VOD services were found to be a substitute for existing multi-channel video programming services.

• Journal of the Korean Institute of Telematics and Electronics D
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• v.36D no.8
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• pp.54-61
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• 1999

This paper proposes a new optic link structure applicable to broad-band wireless access microcellularsystem servicing in the millimeter wave frequency band. The proposed structure utilizes photonic mixing by exploiting the nonlinear property of EOMs, which leads to the frequency up-conversion at the CS and thus, electrical mixing at a BS is not required. Moreover, via transmitting an additional optical millimeter wave carrier into the Bs, the dispenses with an active optic source, which miniaturizes the BS. We analyze CNR, IM3/C in the downlink and SFDR in the uplink. Through simulation using the typical parameter values we also show the feasibility of the proposed system based on the requirements in the current microcellular system.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.46 no.6
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• pp.36-42
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• 2009

In the mobile device environment, the context-aware computing has been emerging as a core technology of ubiquitous computing. Compared with a desktop computer, a user interface and resource of mobile device is very limited. Traditional desktop-based user interface has been developed on the basis that a user's activity is static state. In contrast, mobile devices are not able to utilize representative desktop-based interaction mechanisms such as a keyboard and mouse, not only because the activity of a user is dynamic state, but mobile devices have limited resources and small LCD display. In this paper, we introduce an intelligent control system for the mobile device that can utility effectively the limited resource and complement the poor user interface by using an accelerometer being able to sense the physical activity and posture. The proposed system can estimate the user activity, static and dynamic states, and posture watching the PDA at the same time, and the proposed intelligent control system as its application, the backlight ON/OFF on the PDA, is run by the result of the user's behavior.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.45 no.1
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• pp.55-61
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• 2008

A real-time three-dimensional vision is a passive system, which would support various applications including collision avoidance, home networks. It is a good alternative of active systems, which are subject to interference in noisy environments. In this paper, we designed a SAD correlator with respect to resource usage for a real-time three-dimensional vision system. Regular structures, linear data flow and abundant parallelism make the correlation algorithm a good candidate for a reconfigurable hardware. We implemented two versions of SAD correlator in HDL and synthesized them to determine resource requirements and performance. From the experiment we show that the SAD correlator fits into reconfigurable hardware in marginal cost and can handle about 30 frames/sec with $640{\times}480$ images.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.10a
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• pp.541-544
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• 2015

Through the data communication services in the mobile field in the past of a voice call center (SMS, E-Mail, web surfing, etc.), it has evolved as a "service of smartphone-based" life convenience. According to the latest world book publishing market statistics, the while increasing the proportion of e-books, the proportion of this paper are commercially being reduced. Paper this many e-books in the development of, but active communication in this paper By fusing an NFC-based mobile environment that provides a function to complement the disadvantage of electronic books has, it can give to meet the matters required in more diverse applications. Therefore, in this paper, in order to design and implement an NFC-based mobile phonic fairy book application of, and the efficiency and maintenance of the development through a way to save on rather than storing the information of the management target device server We have implemented a NFC-based mobile education phonic fairy book application that takes into account.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.4A
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• pp.415-422
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• 2004

DSRC provides high speed radio link between Road Side Equipment and On-Board Equipment within the narrow communication area. In this paper, a 5.8 GHz down-conversion mixer for DSRC communication system was designed and fabricated using 0.8 ${\mu}{\textrm}{m}$ SiGe HBT process technology and RF/LO matching circuits, RF/LO input balun circuits, and If output balun circuit were all integrated on chip. The chip size of fabricated mixer was 1.9 mm${\times}$1.3 mm and the measured performance was 7.5 ㏈ conversion gain, －2.5 ㏈m input IP3, 46 ㏈ LO to RF isolation, 56 ㏈ LO to IF isolation, current consumption of 21 mA for 3.0 V supply voltage.

• The Journal of Churna Manual Medicine for Spine and Nerves
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• v.9 no.1
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• pp.89-101
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• 2014

Objectives : The purpose of this study is to report the effect of Korean medicine treatment combined with active release technique on supraspinatus tendon partial tear. Methods : Two patients with supraspinatus tendon partial tear were treated by Korean medicine treatment in combination with active release technique. Visual analog scale(VAS), range of motion(ROM) were used to measure changes during treatment. Results : After treatment, shoulder pain and limited range of motion were improved significantly. Conclusions : Korean medicine treatment in combination with active release technique is proved to be helpful to improve the symptoms of the supraspinatus tendon partial tear patients. And, further studies will be needed.

• Journal of The Korean Association of Information Education
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• v.14 no.3
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• pp.319-328
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• 2010

Computer programming education gives students a chance to use computers independently and actively. This plays a very positive role in acquiring higher cognitive skills such as mathematical skills and creative logical thinking. Thus the purpose of this study is to measure the degrees of students' problem-solving abilities using MCU programming kits based on the ICT Education Guide. The experiment confirms that programming classes using MCU kits have a more positive effect on the students problem-solving abilities than do those using the existing computer textbooks. The sub-constituents of problem-solving abilities - problem recognition, information gathering, analysis, diffuse thinking, decision-making, planning, execution, evaluation and feedback - also show significant statistical differences. Therefore, we can conclude that programming classes using MCU kits are very effective in advancing problem-solving abilities.

• Journal of Digital Convergence
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• v.14 no.7
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• pp.73-81
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• 2016

This study examined the effects of followership characteristics on LMX, knowledge sharing, job satisfaction and turnover intention for coffee speciality store members. 317 questionnaire samples are used to test 4 hypotheses using structural equation model with AMOS. Results of hypotheses testing are as follows: First, goal congruence and active participation factors of followership characteristics influence positively LMX. Second, LMX influences positively knowledge sharing, and knowledge influences job satisfaction and turnover intention. This study emphasizes the importance of knowledge sharing in coffee speciality store members relations. In addition, this study shows that followership, LMX, knowledge sharing are important for members' increasing job satisfaction and decreasing turnover intention, and human resource management. Implications and limitations of this study were also suggested.