• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.3B
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• pp.220-225
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• 2002

MUD(Multiuser detection) technology which locates desired signal and removes interference signal from multiple access signals increases system capacity and decreases multiple access effect. In this paper, we develop a blind adaptive multiuser detector for synchronous CDMA with a noise-whitened filter. To improve the symbol error probability performance, DFBD (Decision-Feedback Blind Adaptive Multiuser Detector) is proposed and compared with BD(Blind Adaptive Multiuser Detector). The proposed DFBD is slightly improved.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.9
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• pp.225-233
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• 2018

The purpose of this study was to investigate the level of interpersonal relationship, self differentiation and adjustment to college life as well as to identify the factors influencing the adjustment to college life in nursing students. The study was conducted on 185 nursing students in D and S Province and from November 15th to December 5th 2016. The data was analyzed using t-test, one-way ANOVA, Pearson's correlation and Multiple regression. The mean score of the adjustment to college life was $3.30({\pm}0.49)$ and the interpersonal relationship was $3.73({\pm}0.41)$ and self differentiation was $3.07({\pm}0.32)$. There were positive correlations between adjustment to college life and interpersonal relationship(r=.614, p<.001) and self differentiation((r=.264, p<.001). Significant factors influencing adjustment to college life were interpersonal relationship, self differentiation which explained 39% of adjustment to college life. Based on these findings, programs that develop interpersonal relationship and self differentiation are necessary for college nursing students in order to promote college adjustment.

• Proceedings of the Korean Society for the Gifted Conference
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• 2003.05a
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• pp.161-166
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• 2003

우리나라 영재교육에 대한 연구들은 대부분 영재아의 개념정의와 판별도구 개발, 영재발굴, 선발 및 그들의 교육에 편중되어 있는 반면 영재아들의 적응, 자기지각, 또래관계등 사회정서발달에 관련된 연구는 거의 이루어지지 못하고 있다 이에 본 연구는 과학영재아동의 개인 및 일상생활에서의 적응수준 및 성별에 따른 적응, 자기지각 및 사회적지지의 차이를 파악하며, 그들의 스트레스에 영향을 미치는 자기지각 및 사회적 지지 수준을 살펴보고 영재아의 사회적 성취나 적응에 도움을 줄 수 있는 방안을 모색하고자 한다. 본 연구의 연구문제는 다음과 같다. 첫째, 과학영재아동과 일반아동의 적응(개인적응, 사회적응, 부적응), 자기지각 및 사회적 지지는 차이가 있는가\ulcorner, 둘째, 과학영재아동의 적응, 자기지각 및 사회적 지지는 성별에 따라 차이가 있는가\ulcorner, 셋째, 과학영재아동의 스트레스에 영향을 미치는 자기지각, 사회적 지지 수준은 어떠한가\ulcorner 본 연구의 대상은 전라북도에 위치한 중학교 1학년 100명의 아동이며, 이들은 교사추천 및 전북대학교 과학영재연구소의 과학과 수학시험을 통해 선발된 과학 영재아동이다. 설문결과 불성실한 응답자를 제외한 총 39명(남아 59명, 여아 30명)이 최종 연구대상이 되었다. 본 연구의 측정도구로 아동의 적응능력검사도구는 한국교육평가센터(KETC)에서 1998년 개발하여 표준화과정을 마친 종합적응능력검사를 사용하였으며, 개인적응영역(자아개념 12문항, 성취동기 10문항, 자기기획 15문항), 사회적응영역(사교성 15문항, 애착 9문항, 사회적 긍정성 10문항), 부적응영역(스트레스 20문항, 욕구좌절 10문항, 편견 12문항) 총 113문항으로 구성되어 있다. 아동의 자기지각검사도구는 Harter(1985)의 Self-Perception Profile이며, 학업역량, 사회적역량, 운동역량, 신체외모역량, 행동품행역량, 자기가치감 각각 6문항씩 총36문항으로 구성되어 있다. 아동의 사회적 지지검사도구는 한미현(1996)이 제작한 척도를 사용하였으며 부모지지, 교사지지, 학교친구지지, 친한 친구지지 각각 6문항씩 총 24문항으로 구성되어 있다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.8A
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• pp.859-867
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• 2004

To provide high-quality media streaming service over the best-effort Internet, a streaming methodology is required to response to the dynamic fluctuation of underlying networks. In this paper, we implement the MPEG-4 streaming system with adaptive transport based on priorities of media packets. The implemented system is composed of the common MPEG-4 streaming components such as elementary stream provider, sync and DMIF layer, and adaptive transport module including data prioritization and FEC control. More specifically, the prioritized sync layer packets (based on object level) are delivered to the transport module and then are encoded by an adaptive FEC encoder to help reliable transport. The FEC combination is dynamically adjusted by the feedback information from the receiver. In addition, low priority packets are selectively dropped to meet the limitation of available bandwidth. The experimental results over the emulation-based testbed show that the Proposed system can mitigate the impact of network fluctuation and thus improve the quality of streaming.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.5C
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• pp.493-505
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• 2003

A new inter-client synchronization framework for multicast media streaming is proposed employing a server-client coordinated adaptive playout control. The proposed adaptive player controls the playback speed of audio and video by adopting the time-scale modification of audio. Based on the overall synchronization status as well as the buffer occupancy level, the playout speed of each client is manipulated within a perceptually tolerable range. Additionally, the server implicitly helps increasing the time available for retransmission while the clients perform an interactive error recovery mechanism with the assistance of playout control. The network-simulator based simulations show that the proposed framework can reduce the playout discontinuity without degrading the media quality, and thus mitigate the client heterogeneity.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.8
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• pp.124-134
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• 2017

The purpose of this study was to investigate the MBTI personality type, emotional intelligence, and stress coping strategies of nursing students and to examine the influence of these factors on their level of college adjustment.The subjects were 267 nursing students who are located in Chonnam city. The survey was conducted from March 6th to March 31st, 2017. The level of college adjustment showed a close correlation with the emotional intelligence(r=.29, p<.001) and stress coping strategies(r=.27, p<.001), and the level of MBTI personality type was not statistically insignificant in the nursing students. It was found that the effect of the emotional intelligence and stress coping strategies on the college life adjustment was 17.5%(F=8.03, p<.001). According to the results of this study, it is necessary to develop a systematic management program to integrate the educational curriculum and extra-curricular activities(in order to enhance the) emotional intelligence and stress coping strategies in nursing students. In addition, the type of psychological function and psychological temperament of the MBTI personality type were found not to have influenced the level of college adaptation of the nursing students and this should be confirmedin a large scale sample.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.9 no.2
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• pp.449-454
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• 2008

As demand for the application in multimedia networks is increasing rapidly, it is important to provide these services in Mobile Environments (ME). Obtaining to multimedia services which satisfy synchronization constraints in ME and improving the delay time and Quality of Service(QoS) between media streams to be presented, new specification model has to be proposed. In this paper we propose Mobile Synchronization Model(MSM) as a new specification model for describing efficiently the QoS and the delay time. Also, we propose the multimedia synchronization algorithm where is a dynamic synchronization method that minimizes the effects of adaptive transmission delay time. The proposed model has higher the guarantee of QoS such as the loss rate and the playout rate than it of the previous work.

• Journal of KIISE:Computing Practices and Letters
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• v.5 no.2
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• pp.247-262
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• 1999

이동 컴퓨팅 환경의 특징은 대역폭의 제약과 잦은 접속의 단절이다. 앞으로 이동 컴퓨팅에 대한 요구는 증가할 것이며 이동 컴퓨팅 환경을 극복할 수 있고 동적으로 적응할 수 있는 서비스를 필요로 한다. RPC(Remote Procedure Call)는 동기적이며 믈록(block)상태를 유발시키는 통신 구조로 분산 응용 프로그램을 작성하기 위한 환경을 제공한다. M-RPC(Mobile RPC) 는 RPC를 이동 컴퓨팅 환경에 맞도록 확장한 것이다. MOM(Message Oriented Middleware)은 분산 통신을 위한 미들웨어로서 분산 프로세스들간에 동기적 또는 비동기적 상호 작용을 지원하는 peer-to-peer 분산 컴퓨팅 모형으로 특징지워진다. 본 논문은 기존 MOM 시스템을 기반으로 하여 이동 컴퓨팅 환경을 지원하는 M-MOM(Mobile-MOM) 시스템을 제안하고 자바 언어로 구현하여 성능을 평가한다. M-MOM 환경에서 이동 호스트(mobile host)에서 실행되는 응용 프로그램과 고정 호스트(fixed host)에서 실행되는 메시지 큐 관리자는 베이스 스테이션(Base Station)에서 실행되는 메시지 에이전트를 통해 메시지 큐 관리자와 동적으로 연결된다. 비동기적인 서비스를 지원하는 M-MOM은 동기적인 서비스만을 지원하는 M-RPC 보다 이동 컴퓨팅 환경을 보다 효과적으로 극복할 수 있는 서비스를 지원한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2005.11a
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• pp.109-112
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• 2005

ATSC 지상파 DTV 시스템에서 심볼 타이밍 동기 성능 개선을 위한 알고리즘을 제안한다. 일반적으로 심볼 타이밍 동기를 위해 사용되는 가드너 방법은 다중 경로 페이딩 환경에서 성능이 좋지만 지터에 의해 성능 열화가 발생한다. 지터량는 루프 필터 대역폭이 작을수록 작아지지만, 수렴속도는 느려지게 된다. 수렴속도는 빠르면서 수렴 후 지터량를 감소시키기 위해 일정시간마다 루프필터의 출력 값을 평균하고 이 평균값을 이용하여 옵셋량을 추정한 후 추정된 옵셋의 변화율에 따라 루프 필터의 대역폭을 줄여 지터의 크기를 줄이는 알고리즘을 제안한다.

• The Journal of the Korea Contents Association
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• v.15 no.3
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• pp.219-228
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• 2015

The purpose of this study was to examine the relationships between anger expression, social supports, and adjustment to college life among nursing students. A convenience sample of 266 students in two colleges participated in the study. Data were analyzed using t-tests, ANOVA, Pearson correlation coefficients, and multiple stepwise regression. The mean score for adjustment to college life was above average. The mean score for adjustment to college life differed significantly according to students' reasons for applying to college and perceived health status. Adjustment to college life significantly correlated with anger expression and social supports. Multiple stepwise regression analysis showed that anger expression (Anger-Out, Anger-In, and Anger-Control), social supports, and perceived health status explained 27.1% of the variance in adjustment to college life. The study findings suggest that interventions intended to promote nursing students' adjustment to college life should focus on improving anger management, social supports, and perceived health status.