다중 주파수 채널을 사용한는 CDMA 셀룰러 이동통신시스템에서 핸드오프호를 위한 예약 할당 방법

권수근,전형구,조경록 대한전자공학회 1997 電子工學會論文誌, S Vol.s34 No.8

Soft handoff provided in CDMA cellular system has much advantage such as better service quality, interference control and low call dropping probability. In this paepr, we propose an optimum resource reservationscheme for handoff calls in the CDMA cellular system to increase the soft handoff probability in handoff. In the proposed scheme, resources of each frquency channel are reserved for handoff according to the number of its neighbot cells serving the same frequency channel. A performance analysis shows that the soft handoff probability of the proposed scheme is higher than that of conventional scheme disregarding the condition of frquency assignment of neighbot cells, and that ever frequency channel served by neighbor cells should reserve more than one traffic channel for handoff to get good performance.

이동 Ad Hoc 망의 라우팅 프로토콜 설계 및 검증

권수근 경주대학교 정보전자기술연구소 2004 情報電子技術論叢 Vol.3 No.-

Many people carry numberous portable devices, such as laptops, mobile phone, PDAs, for use in their professional and private lives. Ad hoc wireless communication between devices might be loosely defined as a scheme refereed to as ad hoc networking, which allows devices to establish communication, ant time and any where without the aid of central infrastructure. Mobile ad hoc networks, the issue of routing packets between any pair of nodes becomes a challenging task because the nodes can move randomly within the network. Mobile Ad hoc network poses a significant technical challenge because of the many constraints imposed by the environment. Thus, the devices used in the field must be lightweight, so it need to be energy conserving so that battery life is maximizes. In this research, In this research, we propose new routing scheme which is based on node's remaining battery power. The new routing will increase battery life at all nodes and network stability The purposed scheme uses routing table based on node power aware metrics., so the packets through nodes that have sufficient battery power.

ISDN에서의 Packet Switching 기술

권수근,Gwon, Su-Geun 한국전자통신연구원 1986 전자통신 Vol.8 No.3

Packet switching 서비스 특성과 packet mode 터미널 수용을 위한 시스팀의 기능 및 packet switching을 실현한 타 교환기를 살펴보고 이를 토대로 ISDN을 위한 packet switching 실현시 교환기 측면에서의 고려사항과 실현해야 할 기본기능을 기술한다.

트래픽 특성을 고려한 CDMA 셀룰러 시스템에서의 자원 할당 방법

권수근 경주대학교 1999 論文集 Vol.12 No.2

In this paper, we propose a new channel assignment method considering traffic characteristics in the CDMA cellular system. The object of proposed method is to reduce the hard handoff of data cells which are very sensitive to transmission errors. In this algorithm, we use three channel assignment policies. First, all of the data calls are assigned to the primary CDMA channel if possible. Second, priority for primary CDMA traffic channels exclusively for data calls. Third, data calls are assigned to the CDMA channel most served by neighbor cells, when all of the primary CDMA traffic channels are used. A performance analysis shows that the minimum soft handoff probability of data calls which is guarantied any cell configuration is increased avove 40% by the adopting proposed algorithm

트래픽 특성을 고려한 CDMA 셀룰러 시스템에서의 채널 할당 방법

권수근,조무호,전형구,안지환,조경록 한국통신학회 1996 韓國通信學會論文誌 Vol.21 No.11

In this paper, we propose a new channel assignment scheme considering traffic characteristics in the CDMA cellular system. The object of proposed method is to reduce the hard handoff of data calls which are very sensitive to transmission errors. In this algorithm, we use three channel assignment policies. First, all of the data calls are assigned to the primary CDMA channel if possible. Second, priority for primary CDMA channel is given to data calls by assigning some primary CDMA traffic channels exclusively for data calls. Third, data calls are assigned to the CDMA channel most served by neighbor cells, when all of the primary CDMA traffic channels are used. A performance analysis shows the minimum soft handoff probability of data calls in handoff which is guarantied any cellconfiguration is increased above 40% by the adopting proposed algorithm.

이동통신시스템의 보안기능 메커니즘 분석

권수근 경주대학교 정보전자기술연구소 2002 情報電子技術論叢 Vol.1 No.-

Security-related issues in mobile communications are increasing. The security requirements of mobile communications for the mobile users include authentication of the mobile user, the data confidentiality, the data confidentiality and the location privacy of mobile user. These services require security features compatible with the wireline networks. However, wireless networks have many restrictions compare to wireline networks such as the limited computational capability of mobile equipment and limited resource(bandwidth) between a mobile user and a fixed network. So, security features for IMT-2000 are designed to meet the limited capacity. In this paper, we analyze the required security features and mechanism, and design network assess security feature effective for IMT-2000 Systems. The design includes security functions allocation to each system. Finally, discuss the computational power of each system based on allocated functions to it.

셀룰러이동망과 WLAN 간의 사용자 프로파일 기반 핸드오프 기법

권수근,Kwon, Soo-Kun 한국정보통신학회 2011 한국정보통신학회논문지 Vol.15 No.6

Different wireless technologies have been developed for various mobile applications. To offer seamless service in next mobile communication systems, it needs handoff service between heterogeneous mobile access networks. A high data rate handoff call from WLAN to cellular mobile network can increase rapidly the blocking probability of BS of cellular mobile network. To solve this problem, this paper proposes a new handoff scheme based on user service profiles. The performances of the proposed scheme are evaluated using computer simulations. 다양한 이동서비스를 지원하기 위해, 다양한 무선접속기술이 제공된다. 차세대 이동통신시스템에서 끊김없는 서비스를 제공하기 위해서는 이기종 무선망간의 핸드오프 서비스가 필요하다. WLAN의 고속데이터서비스가 셀룰러이동망으로 핸드오프하는 경우 셀룰러이동망 기지국의 호차단율이 급격하게 증가할 수 있다. 이러한 문제를 해결하기 위해 본 논문에서는 사용자 프로파일 기반 핸드오프 방식을 제안한다. 성능분석을 통해 제안된 핸드오프 방식 적용시 셀룰러이동망 기지국의 호차단율이 개선됨을 확인하였다.

플로어볼 프로그램이 지적장애학생의 건강체력 및 주의집중력에 미치는 영향

권수근,김혜민,이현수 한국특수체육학회 2018 한국특수체육학회지 Vol.26 No.1

The purpose of this study was to examine the influence of floor ball program on the physical fitness and attention span of students with intellectual disabilities. High school students with intellectual disabilities were selected for this study through purposive sampling. Twenty students were chosen, ten for the experimental group and ten for the control group. The participants are from two high schools located in Yangsan and Kimhae. The program was provided to the experimental group three times a week, for sixty minutes in each session, for total sixteen weeks. PAPS-D(Physical Activity Promotion System) and the ATA Attention-Concentration Test, which were proven to measure concentration and impulsive suppression were used to examine the effectiveness of the program. To verify the hypotheses, data were analyzed through two-way repeated measures ANOVA by using SPSS 23.0. This led to the following results. First, the group participating in the program showed significant changes in all factors such as cardiopulmonary function (6 minute walking), myocardial capacity (flexing the upper body), flexibility (bending forward), and improvisation power (standing long jump). Second, the students with intellectual disabilities participating in the program indicated more changes in omission error(concentration) and number of false alarm(impulsivity) than those not participating in it. 본 연구의 목적은 플로어볼 프로그램을 적용하여 지적장애학생의 건강체력 및 주의집중력에 어떠한 영향을 미치는지 그 효과를 검증하는 것이다. 이를 위해 김해시, 양산시 소재 고등부 특수학급에 소속되어 있는 지적장애 특수교육대상자를 유의표집 하여, 실험군 10명, 통제군 10명 총 20명의 지적장애학생을 연구대상으로 선정하였고, 프로그램은 실험집단을 대상으로 주3회 60분씩 12주간 적용하였다. 프로그램의 효과성을 알아보기 위하여 PAPS-D(장애학생 건강체력 평가시스템) 지적장애학생용 검사와 집중력평가 및 충동억제를 측정하는 신뢰도가 입증된 ATA주의집중력 검사를 사용하였으며, 자료 분석방법은 SPSS 23.0을 이용하여 이원반복분산분석(two-way repeated measures ANOVA)을 실시하였다. 그 결과 다음과 같은 연구결과를 얻었다. 첫째, 건강체력 요인에서 심폐기능(6분 걷기), 근기능(윗몸 말아 올리기), 유연성(윗몸 앞으로 굽히기), 순발력(제자리멀리뛰기)등 모든 요인에서 프로그램에 참여한 집단의 변화가 높은 것으로 나타났다. 둘째, 주의집중력에 미치는 영향은 누락 오류(집중력)와 오경보 횟수(충동성)의 변화가 프로그램을 참여한 집단이 높은 것으로 나타났다.

DS-CDMA 셀룰러 시스템에서 핸드오프 유형별 제공률 분석 및 성능 개선 방법

권수근,전형구,조경록,Kwon, Soo-Kun,Jeon, Hyoung-Goo,Cho, Kyung-Rok 대한전자공학회 1998 電子工學會論文誌, S Vol.s35 No.9

본 논문에서는 멀티 주파수채널을 사용하는 DS-CDMA 셀룰러 시스템에서 제공되는 두가지 핸드오프(하드핸드오프, 소프트 핸드오프)의 제공률을 분석하고 이에 따른 핸드오프 성능 개선 방법을 제안한다. 제안된 방식은 전송지연에 민감한 서비스에 대해 핸드오프 처리시 전송 에러가 많이 발생하는 하드 핸드오프 제공률을 줄이기 위한 방법이다. 전송지연에 민감한 호의 핸드오프 발생시 소프트 핸드오프 제공이 불가능한 경우 해당 주파수채널을 사용중인 전송지연 허용 호를 기지국내의 다른 주파수채널로 핸드오프 시키고 여기에서 발생한 자원을 사용하여 전송지연에 민감한 호의 소프트 핸드오프를 제공해 준다. 컴퓨터 시뮬레이션을 통해 제안된 방식의 성능을 분석하였다. In this paper, we analyze the probability of soft handoff and hard handoff which served in DS-CDMA cellular system, and propose a new handoff control scheme. The object of proposed scheme is to reduce the hard handoff probability of delay sensitive calls which are very sensitive to transmission errors. In this scheme, if soft handoff is not possible, for a delay sensitive call, a delay insensitive call using the same frequency channel that a handoff call is using is handed off to one of other frequency channels and the traffic channel released by delay insensitive call's handoff is assigned to a delay sensitive call for soft handoff. A performance of the proposed scheme was evaluated through computer simulation.

DS-CDMA 셀룰러시스템의 핸드오프 유형별 제공률 분석 및 성능 개선 방법

권수근,이하운 경주대학교 2000 論文集 Vol.13 No.-

In this paper, we analyze the probability of soft hanoff and hard handoff which served in SD-CDMA cellular system, and propose a new handoff control scheme. The object of proposed scheme is to reduce the hard handoff probability of delay sensitive calls which are very sensitive to transmission errors. In this scheme, if soft handoff is not possible, for a delay sensitive call, a delay insensitive call using the same frequency channel that a handoff call is using is handed offf to one off other frequency channels and the traffic channel released bby delay insensitive calls handoff is assigned to a delay sensitive call for soft handoff. A performance of the proposed scheme was evaluated through computer simulation.