• Journal of Korean Society of Transportation
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• v.31 no.4
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• pp.32-46
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• 2013

Because of short length between interchanges, traffic congestion has been caused by a lot of short trip traffic in the urban section of interregional expressway. Also, in case of expressway with Bus Only Lane, bus causes dangerous situation by conflicting between vehicles and buses in order to access from Bus Only Lane to IC. Therefore, this study aims to propose Express Lane applied by Bus Only Lane as a new lane operation in order to efficiently operate and to analyze the effectiveness on constructing Express Lane to the Pangyo-Hannam section in Gyeongbu Expressway. The study analyzes effectiveness by scenario using the micro traffic simulation tool, VISSIM 5.4. For this, the indicators which evaluate construction effect of Express Lane, are used by average delay time, average speed and total travel time. The results of the study showed the best effectiveness when Express Lane installed one, and it represented an ideal traffic condition when long distance trip traffic of the whole traffic is 25% in the study section. Therefore, the construction of Express Lane using Bus Only Lane achieves positive effectiveness on safety and expense aspect as well as uncongested flow.

• Tunnel and Underground Space
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• v.21 no.4
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• pp.281-286
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• 2011

The west underground express way is a recent initiated BTO (Build-Transfer-Operate) project for releasing heavy traffic of the existing west express way which is notorious on-ground road for extremely traffic stuck area in the west of Seoul, South Korea. The new express way for light vehicles is the first double-deck tunnel ever designed in South Korea and 10.91 km long including both open cut structures and concrete lining with middle-deck in bored tunnel. Because the new express way is going through underground of heavily populated area, mechanical & electrical design for the safety of drivers in tunnel is one of the most important parts among many design issues. This paper discusses M & E design focuses including ventilation-evacuation plan and various safety facilities.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.469-470
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• 2023

내연기관 자동차는 연료 소모로 인해 대기 중에 유해 물질과 온실가스를 배출한다. 반면에 전기 자동차는 전기로 작동되어 대기 중 오염을 줄이고 친환경적인 운행을 제공한다. 전기차 대여 시스템을 도입함으로써, 사용자들에게 친환경적인 교통수단을 이용할 수 있는 기회를 제공하고, 탄소 배출량을 줄이는 데 크게 기여할 수 있기에 해당 연구를 진행하였다. 이 연구에는 React 기반의 Next.js 웹 프레임워크를 이용하여 클라이언트 측과 서버 측 렌더링을 지원하고 사용자들에게 빠른 반응 속도와 사용 편의성을 제공한다. Bootstrap을 이용하여 사용자 인터페이스(UI)를 개발하고, 전기 자동차 대여 서비스에 필요한 화면을 구성하였다. 또한 Node.js 기반의 Express.js 웹 프레임워크를 이용하여 서버 사이드 로직과 RESTful API를 개발하는 데 사용하고 데이터베이스와의 통신, 사용자 인증, 대여 정보 관리 등을 처리하였다. 이러한 기술적 개발을 통해 전기 자동차 대여 시스템은 실용적이고 효율적인 서비스를 제공하며, 환경 보호와 탄소 배출 감소에 기여할 수 있는 프로젝트라고 볼 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.05a
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• pp.1667-1670
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• 2005

본 논문에서는 차세대 통신 플랫폼을 위한 PCI Express의 전송계층과 데이터 연결계층의 모든 기능을 지원하는 PCI Express 컨트롤러를 설계하였다. 설계되어진 컨트롤러는 재전송 매커니즘을 효과적으로 지원하기 위해 제안되어진 송신버퍼 구조를 가지고 있다. 이 버퍼 구조는 전송 버퍼와 재전송 버퍼를 한 개의 버퍼로 통합하여 재전송 버퍼의 공간을 유동적으로 할당할 수 있는 방법이다. 또한 설계되어진 컨트롤러의 송신단 전송계층은 제안되어진 버퍼 구조 효과적으로 지원하도록 설계되어 졌다. 설계 되어진 컨트롤러의 각 블록을 효과적으로 관리하기 위해 80C51 마이크로프로세서를 내장하여 PCI Express 프로토콜을 제공하는 프로그램을 코딩하여 포팅하였다. 또한 설계되어진 컨트롤러의 검증을 위해, Host Bridge, 로컬 마스터 디바이스, 로컬 슬레이브 디바이스를 버스 동작 모델로 구성된 테스트 벤치도 제안하였다. 또한 실제 PCI Express 프로토콜 상에서 발생할 수 있는 모든 경우를 발생 하도록 하기 위해, 각 버스 동작 모델을 위한 어셈블러 명령어들을 정의 하였다.

• Journal of the Korean Society for Railway
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• v.19 no.5
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• pp.663-671
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• 2016

This paper investigates how to change passengers' preferences for express trains according to line extension in Seoul Metro Line 9. Before-and-after line extension, we traced passengers' path choices using Smart Card data via the method suggested by Kim et al. (2015). We developed two multinomial logit models before-and-after line extension. Transferability test showed that there is no difference between the two models. However, the load factor of the express train increased by 6.7% and the gap between the local and express trains became significantly wider.

• Proceedings of the KSR Conference
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• 2004.06a
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• pp.738-743
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• 2004

In this paper, the crush characteristic of the tilting train express M-car was estimated under a head-on collision scenario. The car body was divided into three parts - front, middle, and rear. For each part, crush-force relation was evaluated numerically using LS-DYNA 3-diementional shell element analysis. This result will be used for one-dimensional collision analysis of the full train rake.

• KIPS Transactions on Computer and Communication Systems
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• v.6 no.3
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• pp.105-112
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• 2017

PCI Express is a bus technology that connects the processor and the peripheral I/O devices that widely used as an industry standard because it has the characteristics of high-speed, low power. In addition, PCI Express is system interconnect technology such as Ethernet and Infiniband used in high-performance computing and computer cluster. PGAS(partitioned global address space) programming model is often used to implement the one-sided RDMA(remote direct memory access) from multi-host systems, such as computer clusters. In this paper, we design and implement a OpenSHMEM API based on PCI Express maintaining the existing features of OpenSHMEM to implement RDMA based on PCI Express. We perform experiment with implemented OpenSHMEM API through a matrix multiplication example from system which PCs connected with NTB(non-transparent bridge) technology of PCI Express. The PCI Express interconnection network is currently very expensive and is not yet widely available to the general public. Nevertheless, we actually implemented and evaluated a PCI Express based interconnection network on the RDK evaluation board. In addition, we have implemented the OpenSHMEM software stack, which is of great interest recently.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.41 no.4
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• pp.41-49
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• 2004

In this paper, a design and measurement method for FPGA embedded gigabit-transceiver is presented. Altera's Stratix GX device which is general purpose transceiver called GXB was used for implementing PCI Express transceiver. PCI Express is the generation high performance serial I/O bus used to interconnect peripheral devices. After GXB was set follow by PCI Express specifications, the design has been verified by timing simulation and implemented as hardware. We tested it as follow. First GXB internal digital and analog block test second GXB transmitter signal integrity test called Eye mask test, third GXB high-speed serial I/O buffer and on-chip termination test and the last GXB protocol test. This paper shows all the design and measurement procedure about FPGA embedded gigabit-transceiver.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.42 no.4 s.304
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• pp.59-68
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• 2005

In this paper, we design a PCI Express controller for future communication system The controller supports the full functionality of Transaction Layer and Data Link Layer of PCI Express. The designed controller has the proposed transmitter buffer architecture to obey Replay mechanism. This scheme merges the transmitting buffer and the replay buffer. The proposed buffer has the higher data transfer efficiency than the conventional buffer architecture because it can dynamically adjust size of a replay buffer space. We also design transmitter of Transmitter Transaction Layer to effectively support the proposed buffer, The receiver device of PCI Express must possess the buffer for three types of transaction to support Flow Control. And it must report the amount of the buffer space regularly to the Port at the opposite end of the link. We propose the simple receiver buffer scheme using only one buffer to easily support Flow Control. And the designed controller is verified under proposed test bench

• Journal of the Korean Institute of Telematics and Electronics A
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• v.31A no.5
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• pp.18-26
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• 1994

We express fundamental second-order and third- order harmonic distortions and intermodulation distortions in terms of the laser parameters. Compared to the Darcie `s result only limited to the high frequency (f >1GHz), these expression are quite valid in the entire modulation frequency region. It is found that the fundamental nonlinear distortions are strongly effected by the spontaneous emission to lasing mode as well as the gain compresion damping in the low frequency region.