• Title/Summary/Keyword: Transport System

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A Design of Signal Transport System with High Reliability in an Underwater Sensor Array (수중 센서 어레이에서 고 신뢰성을 고려한 신호 전송 시스템 설계)

  • Son Dong-Hwan;Chung Hyun-Ju
    • Journal of the Korea Institute of Military Science and Technology
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    • v.7 no.4 s.19
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    • pp.13-19
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    • 2004
  • A system for detecting underwater target demands a high operational reliability because of the difficulty of maintenance and repair when the system has a few troubles during long operating period. Therefore, in this paper, we have proposed a signal transport system with a high reliability in an underwater sensor array system composed of magnetic and acoustic sensors. In this system, the nodes for signal transport are connected dually each other with single-hop construction and a magnetic sensor is connected to a couple of neighboring nodes. This enables the output signal to transport from a node to the next node and the next but one node. Also, the signal from a magnetic sensor can be transported to two nodes at the same time. Thus, the system with this construction makes possible to transport sensor data to another node which works normally when a transport node or cable have some faults and will operate normally although it happens some problems in a few signal transport nodes and connection cables.

Performance Evaluation of Service-Aware Optical Transport System

  • Youn, Ji-Wook;Yu, Jea-Hoon;Yoo, Tae-Whan
    • ETRI Journal
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    • v.32 no.2
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    • pp.241-247
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    • 2010
  • We propose and experimentally demonstrate a service-aware optical transport system. The proposed service-aware optical transport system makes a flow based on service type and priority of traffic. The generated flow is mapped to a corresponding sub-${\lambda}$ for transport over an optical network. Using sub-${\lambda}$ provided by the centralized control plane, we could effectively provide quality-of-service guaranteed Ethernet service and best-effort service simultaneously in a single link. The committed information rate (CIR) traffic and best-effort traffic are assigned to different sub-${\lambda}s$. The bandwidth of the CIR traffic is guaranteed without being affected by violation traffic because the bandwidth is managed per each sub-${\lambda}$. The failure detection time and restoration time from a link failure is measured to be about 60 ${\mu}s$ and 22 ms, respectively, in the ring network. The measured restoration time is much smaller than the 50 ms industry requirement for real-time services. The fast restoration time allows the proposed service-aware optical transport system to offer high availability and reliability which is a requirement for transport networks.

The Trend of the Standardization of the Urban Guided Transport Management System in Europe (유럽 도시철도 신호시스템의 표준화 동향)

  • Lee Young-Hoon;Kim Jong-Ki
    • Proceedings of the KSR Conference
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    • 2004.06a
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    • pp.1266-1273
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    • 2004
  • Urban railway signaling system is for train operation with safety in the urban crowded area, that has been increasing the demand of use of advanced train control systems with safe. European Commission is supporting the UGTMS(Urban Guided Transport Management System) project for the research and development. The main objective of UGTMS is to provide the European urban guided transport sector (comprising metro, tram and light rail systems) with a common Management System. A key topic is the extent to which the specifications for the successful ERTMS(European Rail Transport Management System) can be adapted to UGTMS needs. Beyond this, it is necessary to define the relevant functional and system requirements for all types of urban guided transport management systems in order to improve interoperability and intermodality. Also to be explored are the prospects for open system standards. In this article, we look into the trend of the standardization through the UGTMS project in Europe and consider any benefit to the project of the standardization for the urban railway signaling system in Korea.

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A study on myo-inositol transport system in peripheral nerve isolated from lead-intoxicated rat. (납 중독 랫드의 말초신경내 myo-inositol 수송 체계에 관한 연구)

  • 정명규;조해용
    • Journal of environmental and Sanitary engineering
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    • v.11 no.2
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    • pp.21-26
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    • 1996
  • In our previous studies, we reported that lead intoxicated nerve cell by inhibition of the Na$^{+}$-K$^{+}$ ATPase activity and reduction of myo-inositol in nerve cell. As the second series of experiments, in order to understand toxic mechanism of lead for nerve cell, the characteristics of myo-inositol transport system and the effect of lead on its system have been studied in the sciatic nerves of control and lead-treated rats. A lead intoxicated animal model was induced by feeding diet containing lead to Sprague-Dawley rat for two weeks. Four weeks aged Sprague-Dawley rats were divided into three group : normal control group, 10ppm-lead treated group, 100ppm-lead treated group. All rats were sacrified at the end of two weeks. The rate o myo-inositol transport by sciatic nerve isolated from lead-treated rat was significantly decreased compared with that of control rat. This deficit results from that myo-inositol transport system which is carrier mediated and sodium-potassium dependent was inhibited by the lead treatment (both 10ppm and 100ppm) due to increase of the Km value without affecting Vmax value for myo-inositol carrier. These observations suggest that the toxic mechanism of lead on nerve myo-inositol transport system might be a change of affinity without change of maximum transport velocity for carrier.

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Analysis and comparison of the 2D/1D and quasi-3D methods with the direct transport code SHARK

  • Zhao, Chen;Peng, Xingjie;Zhang, Hongbo;Zhao, Wenbo;Li, Qing;Chen, Zhang
    • Nuclear Engineering and Technology
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    • v.54 no.1
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    • pp.19-29
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    • 2022
  • The 2D/1D method has become the mainstream of the direct transport calculation considering the balance of accuracy and efficiency. However, the 2D/1D method still suffers from stability issues. Recently, a quasi-3D method has been proposed with axial Legendre expansion. Analysis and comparison of the 2D/1D and quasi-3D method is conducted in theory from the equation derivation. Besides, the C5G7 benchmark, the KUCA benchmark and the macro BEAVRS benchmark are calculated to verify the theory comparisons of these two methods with the direct transport code SHARK. All results show that the quasi-3D method has better stability and accuracy than the 2D/1D method with worse efficiency and memory cost. It provides a new option for direct transport calculation with the quasi-3D method.

Podand-Mediated Transport of $Ag^+$ in a Bulk Liquid Membrane System

  • 조문환;이상철;양승창;신송석;김경태
    • Bulletin of the Korean Chemical Society
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    • v.17 no.12
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    • pp.1109-1111
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    • 1996
  • The Podand Ⅰ (Figure 1) has been studied as cation carrier in a bulk liquid membrane system. Ag+ and some other transition metal ions (M2+=Cu, Ni, Co, Zn, and Cd) have been transported using the podand as carrier in a bulk liquid membrane system. Studies on the transport of equimolar mixtures of two or three competing components have also been carried out with the same system. Ag+ exhibited a higher transport rate than the other M2+ in the competitive experiments. Ligand structure and the equilibrium constant for complex formation are important parameters in the transport of the metal ions.

Design and Performance Evaluation of the Precision Pressure Control System for the High Vacuum Transport Module (고진공 운송계에서의 정밀 압력제어장치의 설게 및 성능시험)

  • Jang, W.I.;Jang, K.H.;Lee, J.H.
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.7
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    • pp.92-98
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    • 1995
  • In the cluster tool, it is necessary to precisely control the vacuum pressure for the wafer transportation between transport module and cassette or process modules with the range of 1*10$^{-4}$ to 5*10$^{-5}$ torr. So we have designed the pressure control system for the transport module of the cluster tool and have evaluated its performance. Digital PID is utilized with the weighted sum of both three previous errors and one current error. The feedback signal is put into the nitrogen mass flow controller using the transport module controller. This pressure control system can prevent the transport module from the particle generation and backstreaming of hazardous process gases of the process chamber.

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A Study on the Scopes of Liability of the Multimodal Carriers (복합운송인(複合運送人)의 책임범위(責任範圍)에 관한 연구(硏究) - UN 복합운송조약(複合運送條約)과 UNCTAD/ICC 통일규칙(統一規則)을 중심(中心)으로 -)

  • Song, Chae-Hun
    • THE INTERNATIONAL COMMERCE & LAW REVIEW
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    • v.16
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    • pp.155-181
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    • 2001
  • International Trade has led to the increase of the demand of international transport, and also the development of international transport not only incurs claims concerning transportation but also establishes various international rules to settle the claims between the shippers and carriers incurred in the course of transport. With a view to settling the claims successfully, the men who are concerned in the transport have to know the principle and scopes of carrier's liability. In this paper, I would like to find out the scopes of liability of multimodal carriers based on the principles of liability. In order to perform the purpose of this study, I classify the liability principle of the international carrier under the UNs Convention on International Multimodal Transport of Good(1980) and UNCTDAD/ICC Rules(1991) in three system-Network Liability System, Uniform Liability System and Modified Liability System. And that I show the results-the scopes of multimodal carriers' liability based on the UN's Multimodal Convention(1980) and the ICC/UNCTAD Rules(1991), and transport vehicles.

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Effect of Sugar Starvation on the Sugar Transport System in Suspension Cultures of Streptanthus trotus (Streptanthus tortus 배양 세포에서 당류고갈이 당류 수송계에 미치는 영향)

  • 조봉희
    • Korean Journal of Plant Tissue Culture
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    • v.27 no.1
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    • pp.47-50
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    • 2000
  • In suspension cultures of Streptanthus. the uptake rate of sugar was increased during the ceil starvation of sugar in the medium. The maximal uptake rate obtained with 3 days of cell starvation. Sugar transport system induced by the sugar starvation was completely inhibited by 10 $\mu$M cycloheximide. Plant cells are known to possess only one sugar transport system, but the uptake rate of glucose obtained a saturated kinetic while the one of sucrose had two different kinetics after the sugar starvation. Induced sugar transport systems had different kinetics compared to plant cell. These results showed that higher plants have adaptable ability to induce new sugar transport systems when the environment changed unsuitable.

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A Study on the Liability Principle of the Multimodal Transporter (복합운송인(複合運送人)의 책임원칙(責任原則) - UN복합운송조약(複合運送條約)과 UNCTAD/ICC통일규칙(統一規則)을 중심(中心)으로 -)

  • Song, Chae-Hun
    • THE INTERNATIONAL COMMERCE & LAW REVIEW
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    • v.13
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    • pp.303-328
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    • 2000
  • International Trade has led to the increase of the demand of international transport, and also the development of transport vehicles has been promoting the volumes of international trade. Therefore, the development of international transport not only incurs claims concerning transportation but also establishes various international rules to settle the claims between the shippers and the carriers in the course of transport. With a view to settling the claims successfully, the men who are concerned in the transport have to know the principle and scope of carrier's Liability. In this paper, I would like to find out the principle of Liability for the shippers. Therefore, I classify the Liability principle of the international transporter under the UNs Convention on International Multimodal Transport of Good(1980) and UNCTDAD/ICC Rules(1991) in three system - Network Liability System, Uniform Liability System and Modified Uniform Liability System.

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