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SAW 소자를 이용한 직접확산방식 스펙트럼확산 통신의 고속동기 시스템
박용서,안재영,안태천,황금찬 한국통신학회 1988 韓國通信學會論文誌 Vol.13 No.5
본 논문에서는 SAW TDL정합필터와 SAW 재순환 루프를 이용하여 SNR이 낮은 경우의 직접확산 방식 스펙트럼확산 통신의 수신단에서 포착 및 추적의 구분없이 동기를 수행할 수 있는 고속동기 시스템을 설계하여 그 특성을 조사하였다. 그 수신단에서 SNR이 -16dB인 신호를 입력시켰을때 이를 SAW TDL정합필터와 재순환루프를 통해 30회 순환시켜 동기신호를 추출하여 수신단의 PN코드를 동기시킬 수 있었다. 그리고 이 동기 시스템의 평균 동기 시간을 계산하였다. 그 결과 이동기 시스템이 수신된 신호의 SNR이 매우 낮은 환경하에서 정합필터만을 사용하는 동기 시스템보다 훨씬 고속으로 수신단의 PN 코드를 동기화 시킬 수 있음을 알 수 있었다. In this paper, a fast synchronization system using SAW TDL matched filter and SAW recirculation loop not only for acquisition but also tracking in the direct sequence spread spectrum communication receiver in case of low SNR was designed and its characteristics were investigated. When signal of 16dB SNR was inputed at the receiver, the PN code of the receiver could be synchronized from the extracted signal for synchronization through SAW TDL matched filter and SAM recirculation loop for 30 recirculations. And the average synchronization time of this system was calculated. From the results, we found that this synchronization system could achieve faster synchronization of PN codes in the receiver under the circumstances of low SNR than that of using only matched filter.
복합환승센터 및 인근 교통시설간 연계환승의 특성에 관한 연구 - 샌프란시스코 트랜스베이 트랜싯 센터를 중심으로 -
박용서 대한건축학회지회연합회 2020 대한건축학회연합논문집 Vol.22 No.1
An example of this study, Transbay district was developed simultaneously with the development of a high-speed railway-based Intermodal Transfer Center with three-dimensional traffic accessibility considered, and the development of transport infrastructure and transportation-oriented development to have a transit relationship between transport facilities. The purpose of the study is to derive the characteristics shown through the analysis of the transbay district in relation to the linked transfer system. As a procedure of research, the overall understanding of development and strategic purpose are given first, and the analysis of traffic accessibility to the Intermodal Transfer Center is conducted by analyzing the relationship between transport facilities and the connection transfer system between transportation means. Based on the characteristics derived from this, we were able to look at urban, architectural, and multiple aspects of urban and architectural in terms of accessibility and convenience of transportation. In addition, the analysis of Urban’s formation architectural factors projects derived from the overall development of the transbay district have been introduced through a process, thereby enhancing understanding of the context of San Francisco’s Total transport infrastructure.
철도중심 광역 복합환승센터의 공간 구성적 특성에 관한 연구 - 일본 오사카 스테이션 시티를 중심으로 -
박용서 대한건축학회지회연합회 2017 대한건축학회연합논문집 Vol.19 No.2
Today, When Intermodal Transit Center(ITC) is appeared for the urbanistic central function and combining the transit transfer function. Between these two combination of problems, it is concluded to the problem about the method of the intermediate-zone. Presently, Examine about the problem with the urban space which is appeared in the ITC of the Railroad Station Oriented in Korea, comparing with foreign countries, Korea just focused on the commercial development. Therefore, bring in 'method of the intermediate-zone' as the element of the integration. So this study will pays attention to the Mixed- use Development of the ITC of the Railroad Station Oriented to Japan as the learning model. we can review for characteristice of the intermediate-zone appear in Mixed-use Development with these case study. On the base of this study, it can contribute to the development policy for the urbanism integration with the ITC in Korea. and also it can be in charge of the reference the role.