• Title, Summary, Keyword: internal bus

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Counterattack Method against Hacked Node in CAN Bus Physical Layer (CAN 버스 물리 계층에서 해킹된 노드의 대처 기법)

  • Kang, Tae-Wook;Lee, Jong-Bae;Lee, Seongsoo
    • Journal of IKEEE
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    • v.23 no.4
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    • pp.1469-1472
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    • 2019
  • CAN bus in automotive applications does not assign node addresses. When a node is hacked and it transmits malicious data frame, it is difficult to resolve which node is hacked. However, this CAN bus internal attack seriously threatens the safety of a car, so a prompt counterattack is necessary in the CAN bus physical layer. This paper proposes a counterattack method against malicious CAN bus internal attack. When a malicious data frame is detected, an intrusion detection system in the CAN bus increases the error counter of the malicious node. Then, the malicious node is off from the bus when its error counter exceeds its limit. A CAN controller with the proposed method is implemented in Verilog HDL, and the proposed method is proved to counterattack against malicious CAN bus internal attack.

Temperature Rise Prediction of GIS Bus Bar Considering Thermal Flow (열유동을 고려한 GIS 모선의 온도상승 예측)

  • Kim, Joong-Kyoung;Oh, Yeon-Ho;Lee, Ji-Yeon;Hahn, Sung-Chin
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.4
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    • pp.742-747
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    • 2009
  • Many works on the temperature distribution of power apparatus have usually done by coupled magneto-thermal analysis. Such a method can not consider the internal gas or oil flow in the power apparatus such as gas insulated switchgear, GIS bus bar, and power transformer. Moreover it can not show the internal temperature distribution of the power apparatus exactly. This paper proposes a coupled magneto-thermal-flow analysis considering Navier-Stokes equations. The convection heat transfer coefficient is calculated analytically by applying Nusselt number for natural convection and is applied to the boundary condition of proposed method. Temperature distribution of the GIS bus bar model considering thermal flow is obtained by the proposed method and shows good agreement with the experimental data.

A Current Differential Relaying Algorithm for Bus Protection Using a Compensating Algorithm of Secondary Currents of CTs (변류기 전류보상 알고리즘을 이용한 모선보호용 전류 차동계전 알고리즘)

  • Gang, Yong-Cheol;Yun, Jae-Seong;Kim, Dong-Yong
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.49 no.9
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    • pp.446-450
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    • 2000
  • A conventional variable percentage current differential relaying algorithm for bus protection may misoperate for external faults with severe CT saturation and internal faults with high impedance. This paper proposes a percentage differential current relaying algorithm for bus protection combined with a compensating algorithm of secondary currents of CTs. Even though CTs are saturated and their secondary currents are severely distorted, the proposed relaying algorithm does not only misoperate for external faults with CT saturation but also detects the internal faults with high fault impedance. Thus, the method improves the sensitivity of the relays and does not require any counterplan for CT saturation.

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Analysis of the Internal Electrical Characteristics of Electronic Power Transformers

  • Yi, Yang;Mao, Cheng-Xiong;Wang, Dan;Lu, Ji-Ming
    • Journal of Power Electronics
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    • v.13 no.5
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    • pp.746-756
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    • 2013
  • The modularized subunit of an electronic power transformer (EPT) is a series connection of two H-bridge voltage-source converters and a DC-DC converter with a high-frequency isolation transformer (HFIT). On the basis of cascading and paralleling the modularized subunits, EPT can be used in high-voltage and large-current applications in the power system. This paper discusses the steady state analysis of the modularized subunit of EPT. Theoretical analysis considers the influences of the two H-bridge voltage-source converters on the two sides of the DC-DC converter. We deduce the formulas of the theoretical calculation on the internal electrical characteristics of EPT (e.g., the voltages of the DC-bus capacitor and the primary side peak current of the HFIT). This paper provides guidance on the design and selection of EPT key elements (e.g., the DC-bus capacitors and HFIT). Experimental results are obtained from a single subunit of a laboratory model rated at 962 V, 15 kVA. All calculations, simulations, and experiments confirm the theoretical analysis of the subunit of EPT.

Physical Layer Security Method with CAN Bus Node ID Auto-Setting (CAN 버스에서 노드 ID 자동 설정을 통한 물리 계층 보안 기법)

  • Kang, Tae-Wook;Lee, Jong-Bae;Lee, Seongsoo
    • Journal of IKEEE
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    • v.24 no.2
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    • pp.665-668
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    • 2020
  • When a node in automotive CAN bus is hacked, such node should be blocked to prevent severe danger in the car. In order to do that, such node should be uniquely identified. However, there is no way to identify individual nodes in a CAN bus. In this paper, a physical layer security method is proposed where individual nodes are identified by assigning unique ID to the nodes during booting process. The proposed method was implemented in a CAN controller using Verilog HDL, and it is verified that the node ID auto-setting and internal attack defense are successfully performed.

A study on sensing for abnormality of BUS BAR in motor control center (모터컨트롤센터의 BUS BAR 이상 감지를 위한 실험적 연구)

  • Kim, Sung-Dae
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.12
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    • pp.5838-5842
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    • 2011
  • The study mainly aims to explore how deterioration of motor control center, namely MCC, and vibration put impact on temperature of bus bar as well as temperature change of bolt-nut joint. The motor control center consists of three internal parts (i.e. R, S, T) which are for motor operation of high capacity. Two dimensional mechanism for measuring temperature was designed and manufactured with infrared temperature sensor. Installing it in inner motor control center enabled researcher to monitor temperature of bus bar as well as amount of change of current regularly. Temperature change of bus bar according to load was primarily examined based on a bolted joint in the experiment. It was clearly verified that temperature change of bus bar was proportional to current consumption. Therefore, installing non-contact two dimensional mechanism for measuring temperature in motor control center would be expected to prevent temperature rise owing to overload current and power outage as well as fire accident which can be triggered by poor electrical contact.

An Analysis on the Effect of Environmental Improvement on Replacing CNG Bus in Seoul with Electric Bus (서울의 CNG버스를 전기버스로 대체했을 때 환경 개선 효과 분석)

  • Choi, Byeong-Joo;Na, Hae-Joong;Choi, Uk-Don;Kim, Jong-Hae
    • Journal of IKEEE
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    • v.24 no.3
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    • pp.821-827
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    • 2020
  • In particular, vehicles with internal combustion engines of public transportation such as diesel and CNG buses are in urgent need of measures to reduce emissions as they have a long daily total mileage, long driving hours and a large number of vehicles. In this paper, the fuel consumption rate (km/kWh) was actually measured through road test of electric buses. Based on the measured values, CO2 emissions from internal combustion engines and electric buses were calculated per bus. In addition to environmental improvement effects such as the expected reduction of carbon dioxide compared to CNG buses when replacing city buses with electric buses, additional effects were analyzed when the replacement of CNG buses is expanded to electric buses.

Preliminary Design of Power Control and Distribution Unit for LEO Application (저궤도 위성 응용을 위한 전력조절분배기 설계)

  • Park, Sung-Woo;Park, Hee-Sung;Jang, Jin-Baek;Jang, Sung-Soo;Lee, Sang-Kon
    • Proceedings of the KIPE Conference
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    • pp.55-57
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    • 2007
  • A Power control and Distribution Unit (PCDU) plays roles of protection of battery against overcharge by active control of solar array generated power, distribution of unregulated electrical power via controlled outlets to bus and instrument units, distribution of regulated electrical power to selected bus and instrument units, and provision of status monitoring and telecommand interface allowing the system and ground operate the power system, evaluate its performance and initiate appropriate countermeasures in case of abnormal conditions. In this work, we perform the preliminary design of a PCDU for the small Low Earth Orbit (LEO) Satellite applications. The main constitutes of the PCDU are the battery interface module, solar array regulators with maximum power point tracking (MPPT) technology, heater power distribution modules, internal converter modules for regulated bus voltage generation, power distribution modules of unregulated and regulated primary bus, and instrument power distribution modules.

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Implementation of Multipurpose PCI Express Adapter Cards with On-Board Optical Module

  • Koo, Kyungmo;Yu, Junglok;Kim, Sangwan;Choi, Min;Cha, Kwangho
    • Journal of Information Processing Systems
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    • v.14 no.1
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    • pp.270-279
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    • 2018
  • PCI Express (PCIe) bus, which was only used as an internal I/O bus of a computer system, has expanded its function to outside of a system, with progress of PCIe switching processor. In particular, advanced features of PCIe switching processor enable PCIe bus to serve as an interconnection network as well as connecting external devices. As PCIe switching processors more advanced, it is required to consider the different adapter card architecture. This study developed multipurpose adapter cards by applying an on-board optical module, a latest optical communications element, in order to improve transfer distance and utilization. The performance evaluation confirmed that the new adapter cards with long cable can provide the same bandwidth as that of the existing adapter cards with short copper cable.

The Impact of the Bus Use Environments on Users Stress: The Case of Daejeon City (버스이용환경이 이용자의 스트레스에 미치는 영향: 대전시를 사례로)

  • LEE, Jaeyeong;PARK, Jin Hee
    • Journal of Korean Society of Transportation
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    • v.33 no.6
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    • pp.543-553
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    • 2015
  • This study analyzed that the impact of the bus use environment on users' stress in each step of bus use, from accessing to leaving to transfer, in the city of Daejeon. For this, we collected the stress data from 300 users using personal interviews at the bus stops and on-board bus. Also, we used factor analysis and structural equation model method for analysis of the impact of external and internal bus environments on stress of users. The results of this study showed that the highest stress impact factor was an onboard factor(${\beta}=.416$) including 'density and crowding', 'no seat to seat' and 'low ride comfort and safe'. The next stress impact factor was transfer factor including 'insufficient transfer information', 'lack of connectivity of bus and subway' and 'uncomfort transfer route'. From the above, we recommend that bus policies need to focus on not the supplier but users and also, this user based policy need to be more specified considering the characteristics of various users such as females, the elderly, irregular users, and so on.