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컴퓨터 소프트웨어를 이용한 인지 훈련 방법의 연구 동향
이주현,오도영,구교인,Lee, Juhyeon,Oh, Doyeong,Koo, Kyo-In 대한의용생체공학회 2014 의공학회지 Vol.35 No.6
Mild cognitive impairment is status between healthy people and dementia patients. In order to prevent dementia or slow its progression, cognitive interventions could be effective. In this paper, review of the cognitive intervention with computer software was undertaken. Previous reports showed that the cognitive intervention with additional equipment could practical to the mild cognitive impairment.
인지무선네트워크에서 적응적 채널예측에 기반한 핸드오프기법
이주현,박형근,Lee, Juhyeon,Park, Hyung-Kun 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.10
인지 무선 네트워크에서 스펙트럼 핸드오프는 현재의 전송채널을 다른 유휴채널로 바꾸어 데이터를 전송하는 과정이다. 스펙트럼핸드오프의 목적은 부사용자에게 끊김 없는 데이터전송을 지원하여 지속적인 전송품질을 보장하기 위함이다. 그러나 이와 같은 핸드오프과정은 심각한 전송지연을 야기할 수 있다. 이때 채널 예측을 바탕으로 핸드오프를 실행할 경우 핸드오프에서 시간이 소요되는 부분을 미리 실행하므로 핸드오프 지연을 줄일 수 있고 주사용자에 대한 간섭도 줄일 수 있다. 본 논문에서는 실시간으로 통계적 특성이 변화하는 채널 상황에서 채널 예측을 정확성을 높이기 위한 적응적 채널 예측 방법을 제안하였다. 또한 적응적 채널 예측을 바탕으로 하여 핸드오프시점을 미리 추정하고 적절한 채널을 선택하여 핸드오프 과정을 설계하였다. Spectrum handoff is the process of exchanging progressing data transmission from the current channel to another idle channel. The essential goal of spectrum handoff in CR(Cognitive Radio) networks is to perform consistent data transmission while sustaining performance of ongoing transmission of secondary users. This handoff procedure can cause additional latency that eventually affects on the performance of CR transmission. Channel prediction method is expected to avoid the disruption to primary users and to reduce the handoff latency. In this paper, adaptive channel prediction is proposed to cope with time-varying channel and an adaptive channel prediction based proactive handoff procedure is designed to enhance data transmission performance.
능동형 상지 운동 로봇을 위한 로드셀 기반 사용자 동작 의도 신호 생성기법 제안
이주현(Juhyeon Lee),엄성훈(Sunghoon Eom),문전일(Jeon-Il Moon),이승열(Seungyeol Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
This paper suggests Load-cell sensor based recognition of user motion intention for active upper limb exercise robots reflected user motion intention. In particular, we present a method of understanding user motion intention using combination of multiple Load-cell sensors for separating user’s condition and signal pre-processing for force information delivery to robot systems.
이주현(Juhyeon Lee),박형근(Hyung-Kun Park) 대한전기학회 2012 전기학회논문지 Vol.61 No.4
In Cognitive Radio network, spectrum selection scheme is one of a important part to manage idle spectrums efficiently. However, in CR networks, they have to adopt time-varying channel availability to minimize the interference to primary users (PU), and be able to manage spectrum resources efficiently. In this paper, we proposed a modified PF scheduler which can be appropriate to schedule downlink CR users and channels, by considering the fairness and the throughput as well as the primary user characteristics of each channel.
교육 패러다임 변화에 따른 산업체 멘토의 역할에 대한 연구
이주현 ( Juhyeon Lee ),박형근 ( Hyung Kun Park ) 한국실천공학교육학회 2012 실천공학교육논문지 Vol.4 No.2
Cooperative education a new paradigm of education is a educational method of combining classroom-based education with practical work experience. To obtain appropriate learning experience during the work period industrial mentors who provide beneficial advice and instruct students are needed. Industrial mentors basically performs various roles in helping students to make the experiential learning efficiently and the scope of their role is broad. In this paper we classified the role of industrial mentors proposed appropriate operating models and described the detail of their responsibilities.
WiMAX 시스템에서 QoS에 기반한 Multi-Class 스케줄러
이주현(Juhyeon Lee),박형근(Hyung-Kun Park) 대한전기학회 2010 전기학회논문지 Vol.59 No.4
Mobile WiMAX system provides various classes of traffic such as real-time and non-realtime services. These services have different QoS requirements and the QoS aware scheduling has been an important issue. Although many of scheduling algorithms for various services in OFDMA system have been proposed, it is needed to be modified to be applied to Mobile WiMAX system. Since Mobile WiMAX supports five kinds of service classes, it is important to take QoS characteristics of each class into consideration. In this paper, we propose an efficient packet scheduling algorithm to support QoS of each class. Proposed scheme selects a service class first considering QoS Characteristics of each class and choose an appropriate user in the selected class. Simulation results show that the proposed algorithm has better performance than the other algorithm.