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        • KCI등재

          Binary CDMA 기반의 무선 CCTV 시스템 설계 및 구현

          최재원,Choi, Jae-Won 한국정보통신학회 2012 한국정보통신학회논문지 Vol.16 No.1

          Binary CDMA는 음성 영상 등의 멀티미디어 데이터를 초고속으로 우수한 전송품질로 통신할 수 있는 우리나라가 개발한 새로운 표준 무선통신 기술이다. 본 논문에서는 케이블의 설치나 매설 작업 없이 원하는 장소에 자유롭게 설치할 수 있는 Binary CDMA 기반의 무선 CCTV 시스템 개발을 위한 시스템의 설계 및 구현방법에 관해 연구하였다. 멀티미디어 통신보드와 RF 모듈을 개발하고, 무선 영상전송기와 CCTV 중계기의 응용프로그램을 구현하여 Binary-CDMA 무선 CCTV 시스템의 시제품을 개발하였다. Binary CDMA is a new standard technology for wireless communication developed by our country that makes high speed communications and good quality of services. In this paper we researched the design and implementation methods of a wireless CCTV System based on the Binary-CDMA technology that makes it freely installed in any place without cables and laying works. We implemented the hardware and software for the CCTV system and developed a Prototype Wireless CCTV system based on the Binary-CDMA technology.

        • KCI등재

          Binary CDMA 무선통신 기반의 자동차 후방카메라 시스템의 개발방법 및 설계

          최재원,Choi, Jae-Won 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.8

          Car rear-view camera system supplies various services for life protection, ease of parking, and safe driving by showing the rear of the vehicle through monitor when reversing the car. In this paper we researched development methods and design of a Car Rear-view Camera System based on the Binary CDMA technology - new technology of wireless personal area network developed by Korea - that makes free installation without wired cables restriction and reduces installation costs and technology royalties. 자동차 후방카메라 시스템은 후진시 차량 후방을 모니터 영상으로 보여주어 인명보호와 주차의 편리, 운전자의 안전 운전을 위한 다양한 서비스를 제공한다. 본 논문에서는 우리나라가 독자 개발한 개인용 무선통신 Binary CDMA 신기술을 이용하여 설치가 자유롭고 설치비용과 기술료를 절감할 수 있는 자동차 후방카메라 시스템의 개발방법 및 설계에 관해 연구하였다.

        • KCI등재

          Active-Active 방식의 DNS 서버의 이중화 구축 및 결함내성 시험

          최재원,Choi, Jae-Won 한국정보통신학회 2013 한국정보통신학회논문지 Vol.17 No.1

          본 논문에서는 기존의 Active-Standby 방식의 이중화가 아닌 Active-Active 방식의 DNS (Domain Name System) 이중화에 관해 연구하였다. Active-Active 방식의 DNS 이중화를 위해 1, 2차 DNS 서버 간에는 rsync와 crontab을 이용하여 주기적으로 복사하여 동일한 상태를 유지하고, 1차 혹은 2차 DNS 서버가 장애로 인해 정지되더라도 살아 있는 DNS 서버가 계속해서 서비스를 지속하도록 하였다. Active-Standby Duplication Techniques are conventionally used for fault-tolerant systems. But in this paper we researched on the Active-Active Duplication Techniques for Fault-tolerant DNS System. Our Active-Active Duplication made the 1st DNS periodically copied to the 2nd DNS and maintained the same status by using Rsync and Crontab. Even though the 1st or the 2nd DNS stops due to some critical errors, the remaining DNS can take over and provide continuous services.

        • KCI등재

          결함내성을 가진 도메인네임 서버의 구축 및 연동시험

          최재원,Choi, Jae-Won 한국정보통신학회 2011 한국정보통신학회논문지 Vol.15 No.1

          DNS(Domain Name System)는 인터넷상의 호스트의 도메인주소를 IP주소로 변환하거나 IP주소를 도메인주소로 변환하는 이름해결 메카니즘을 총칭한다. 본 논문에서는 1차 DNS 서버가 오류로 인해 정지하더라도 2차 DNS 서버가 대신하여 서비스를 지속할 수 있도록 하는 결함내성을 갖는 DNS 시스템 구축에 관해 연구하였다. DNS(Domain Name System) is the Name Resolution Mechanism that makes conversion from a Domain Name of a computer on the Internet to an IP Address or the reverse conversion. In this paper we researched on the Foundation techniques of Fault-tolerant DNS Servers that the secondary DNS can take over and provide continuous services even though primary DNS stops due to some critical errors.

        • 체간 양측성 회전 운동과 PNF 운동이 부정렬 증후군을 가진 성인의 보행에 미치는 영향

          최재원,노현정,Choi, Jae-Won,No, Hyun-Jeung 대한고유수용성신경근촉진법학회 2011 PNF and Movement Vol.9 No.4

          Purpose : The aim of this study was to identify of bilateral trunk rotation(BTR) exercise and PNF exercise on gait in the individuals with malalignment syndrome. Methods : Subjects were 32 that were divided 2 groups in 20's generation. Interventions were trunk ratation exercise and PNF exercise. We used Medex for trunk rotation exercise. BTR group received exercise for three-sets (10min/set) along with stretching exercise ten-minutes, 3 times per week. PNF group took turns the D1 pattern in upper extremity and the D1 pattern in the opposite side of lower extremity for three-sets (10min/set). The measurement were force metatarsal 1 (FM 1), impulse metatarsal 1 (IM 1), force heel lat (FHL), impulse heel lat (IHL) by using footscan (RS scan). Statistical method was repeated measurement of ANOVA and p value was 0.05. Results : BTR and PNF group were significantly different in time(FM 1, IM 1, FHL, IHL). As different of right/left, BTR and PNF exercise were significantly different in FM 1, IM 1, FHL. Conclusion : BTR exercise was good exercise for malalignment but needs expensive equipment, for example, Medex. PNF exercise doesn't need expensive equipment but good method in malalignment syndrome person for gait ability. If PNF exercise is more experiment, PNF exercise could use variety for more patients.

        • KCI등재

          u-Campus 실현을 위한 유비쿼터스 종합정보시스템의 개발방법 및 설계

          최재원,Choi, Jae-Won 한국정보통신학회 2010 한국정보통신학회논문지 Vol.14 No.2

          본 논문에서는 언제 어디서나 대학의 인적 물적 지적 정보를 효율적으로 접근할 수 있고, 인터넷폰(VoIP), 이메일, 통합메세징, 인스턴트메시징, 웹컨퍼런싱, 화상회의 등의 다양한 커뮤니케이션 도구를 통해 통신 협업할 수 있는 대학의 유비쿼터스 종합정보시스템(u-종합정보시스템)을 최소한의 비용으로 효과적으로 구축하기 위한 시스템의 개발방법과 설계에 관해 연구하였다. In this paper we researched the development methods and design of the Ubiquitous Integrated Information System (u-IIS) that makes efficiently access the experts and various kinds of intellectual and material information of the universities. And u-IIS supports various communication and cooperation tools such as VoIP, Email, Unified Messaging, Instant Messaging, Web Conferencing, Audio/Video Communication etc. We gave our focus to the methods and design that makes it possible to effectively implement the u-IIS with the least costs based on the available databases and infrastructures.

        • KCI등재

          편광현미경을 이용한 PTT/PTN 블렌드의 등온결정화 거동 분석

          최재원,차희철,김영호,Choi, Jae-Won,Cha, Hee-Cheol,Kim, Young-Ho 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.6

          Isothermal crystallization behaviors of poly(trimethylene terephthalate) (PTT), poly(trimethylene naphthalate) (PTN), and PTT/PTN blends were analyzed using a polarizing microscope equipped with a hot-stage. As the melting time at $260^{\circ}C$ of PTT/PTN blends increased, the crystallization proceeded slowly due to the copolymer formation which resulted from the ester interchange reaction at the elevated temperature. PTT and m-rich blends formed spherulites over the temperature range of experiment, but PTN formed spherulites only at lower crystallization temperatures such as $150^{\circ}C$. PTN and PTN-rich blends formed distorted spherulites at high temperatures such as $180^{\circ}C$, which seemed to result from the $\beta-crystal$ formation of PTN at that temperature. The radial growth rate of the spherulite formed during the crystallization was obtained by the measurement of radii of the spherulites. The radial growth rate decreased as PTN content in the blends increased.

        • KCI등재

          프로그램화 된 신체운동이 ADHD 아동의 주의산만행동과 과잉행동에 미치는 효과

          최재원(Jae Won Choi),강경두(Kyoung Doo Kang),정혜연(Hye Yeon Jung) 한국사회체육학회 2012 한국사회체육학회지 Vol.0 No.47

          The purpose of this study is to deeply analyze a change of the programmed physical exercise in attentiondeficient behavior and hyperactivity of children with ADHD, through the single-subject research design method. The research subjects were 4 elementary school students who are under being cured due to being judged to be ADHD at Child Psychiatric Clinic for C University Hospital where is located in Seoul at that time of beginning experiment in order to be conformed with the objective of research. For visual observation, the attention-deficient behavior was used the frequency-typed case sampling method(Shin So-yeon, Park Jaeguk, Kim Yeong-mi, Lee Hwa-eun, 2007). Observation of hyperactivity was used the contents, which Carlson and Hotfield(1991) defined, by referring to the contents by Mun Jae-gyeong(1998). The following are the results that were elicited through the research procedure of this study. First, the programmed physical exercise was indicated to reduce attention-deficient behavior in children with ADHD. Second, the programmed physical exercise was indicated to reduce hyperactivity in children with ADHD.

        • KCI등재

          다양한 입자크기 및 표면개질 버텀애쉬를 이용한 폴리에틸렌/버텀애쉬 복합소재의 특성

          최재원,김하연,정용찬,전병철,Choi, Jae Won,Kim, Ha Youn,Chung, Yong-Chan,Chun, Byoung Chul 한국섬유공학회 2013 한국섬유공학회지 Vol.50 No.1

          Surface treated bottom ash was utilized as a filler to prepare plastic composites. Bottom ash surface was modified with octyltriethylammonium bromide (OTAB) or hexyltriethylammonium bromide (HTAB) by ion exchange procedure in methanol solution. Surface-modified bottom ash was then melt-compounded with HDPE to investigate its compatibility with the matrix material. The mechanical properties such as tensile, compressive, and impact strength, in addition to morphologies, were analyzed to determine the advantage of surface treatment compared to using bottom ash without treatment. Tensile strength and compressive strength increased with increasing bottom ash content.

        • KCI등재

          $^1H-NMR$과 WAXS를 이용한 폴리(트리메틸렌 테레프탈레이트)/폴리(트리메틸렌 나프탈레이트) (50/50) 블렌드의 에스터 교 환반응 연구

          최재원,오태환,김영호,Choi, Jae-Won,Oh, Tae-Hwan,Kim, Young-Ho 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.5

          Poly(trimethylene terephthalate) (PIT) and poly(trimethylene naphthalate) (PTN) blends of 50/50 weight ratio, T5N5, were prepared by solution blending-precipitation method, and the effect of melting time on the degree of randomness, sequence length, and crystalline structure of melt-pressed blends obtained by melting T5N5 on a hot stage at $260^{\circ}C$ for different times and quenching into liquid nitrogen was studied using DSC, $^1H-NMR$ and WAXS. The T5N5 blend showed two $T_gs$ corresponding to that of PTT and PTN, which indicated that PTT and PTN were immiscible. But the melt-pressed blends melted at $260^{\circ}C$ for 2 minutes or more showed single $T_g$ indicating that the system became miscible. $^1H-NMR$ analysis confirmed that the blends became block copolymers and that the degree of randomness increased as melting time increased. The sequence length of PTT component was larger than that of PTN in the resultant copolymer. Although PTT and PTN were present in the same amount in the blend, PTT component crystallized more easily than the PTN component due to the larger block length of PTT. The crystalline structure of the component polymers was the same as that of homopolymers. The WAXS patterns showed that the crystalline structure of PTN in the melt-pressed blends was $\beta-form$ when they were annealed at $180^{\circ}C$ but it was a-form when annealed at $140^{\circ}C$, exhibiting the same behavior as homo PTN.

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