• Transactions of the Korean Society of Automotive Engineers
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• v.16 no.1
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• pp.71-77
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• 2008

This paper proposes an Electronic Throttle Body (ETB) model considering a non-linearity of DC motor driver which is integrated with a H-bridge and a gate driver. A propagation delay and reverse recovery time of switching components cause non-linear characteristic of DC motor driver. This non-linearity affects not only the amateur voltage of DC motor, but also entire behaviour and parameters of ETB. In order to analyze the behavior of ETB more accurately, this non-linear effect of DC motor driver is modeled. The developed ETB model is validated by use of the step response and ramp response experiments, and it shows relatively accurate results compared with linear DC motor driver model.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.12 no.2
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• pp.184-192
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• 2001

In this paper, we analyze the result of the conduced emission and susceptibility tests performed on the KOMPSAT-I ETB Platform. The ETB platform consists of the EM (Engineering Model) boxes developed to perform the electrical functional test. During the conducted emission test, we measured the instant waveform in time domain when each switch was turn on, and spectrum of the noise in the frequency range of 10 Hz up to100 MHz fur the steady state of the ETB. During the conducted susceptibility test, no malfunction and no serious damage of the electronic box were observed when a simulated noise waveform was applied to the DC power bus. The simulated waveform was obtained by adding the 6 dB-system margin to the worst case waveform measured from the conducted emission. This test was performed as co-development of the KOMPSAT-I with TRW in USA.

• The Journal of the Korea Contents Association
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• v.5 no.2
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• pp.187-197
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• 2005

In this paper, we propose an extended TB-tree, called ETB-tree, which can improve the performance of an existing TB-tree proposed for indexing the trajectories of moving objects in Location-Based Service(LBS). The proposed ETB-tree directly accesses the preceding node by maintaining a direct table, called D-Table which contains the page number in disk and memory pointers pointing the leaf node with the first and last lines segment of moving objects. It can improve the insertion performance by quick searching the preceding node of a moving object and retrieval performance owing to accessing directly the corresponding trajectories In disk for the trajectory-based query. In addition, the ETB-tree provides consistency of a tree by reflecting a newly inserted line segment to the tree both in memory and disk. The experimental results show that the proposed indexing technique gains better performance than other traditional ones with respect to the insertion and retrieval of a trajectory query.

• 제어로봇시스템학회:학술대회논문집
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• 2004.08a
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• pp.602-607
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• 2004

Accurate and quick positioning of the throttle valve in driving situation is required to implement the Traction Control System(TCS). Also, unlike a conventional throttle valve which is connected to the accelerator directly by a wire, an Electronic Throttle Valve(ETV) is driven by a DC motor and can move dependently upon the accurate position of the accelerator. In the research, the Electronic Throttle Body(ETB) and Controller for TCS application was developed. In order to drive the DC motor, the developed controller was built and interfaced to the ECU and ETB. The PID position control algorism and developed systems are designed to realize the robust tracking control of the ETV. Actual vehicle tests with these systems and PID position control algorithm. Finally, the performance of the proposed those are evaluated with the experimental studies.

• Bulletin of the Korean Space Science Society
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• 2003.10a
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• pp.105-105
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• 2003

인공위성의 개발과정에서 비행모델을 만들기 전 EM (Engineering Model) 들로 구성하는 Electrical Test Bed (ETB) 를 개발하여 위성의 하니스를 포함함 각 서브시스템 전장품들의 성능을 점검하게 되고, ETB 시험기간 동안 발생된 문제점 들은 비행모델 설계와 제작에 반영하게 된다. 다목적실용위성 2호에 대한 ETB를 개발하여 각종 위성 전장품에 대한 성능과 부분품들간의 인터페이스 신호들의 점검을 성공적으로 완료하였으며, 시험기간 동안 발생된 각종 문제점들은 비행모델 설계와 제작에 이미 반영하였다. 본 논문에서는 다목적실용위성 2호 비행모델에 대한 시험을 위하여 각 서브시스템 즉, 원격측 정명령계, 전력계, 자세제어계의 전장품과 탑재소프트웨어 그리고 각종 시뮬레이터들의 구성과 전기/전자적인 기능시험을 위한 시험항목 및 방법에 대해 고찰하고자 한다.

• Proceedings of the KIEE Conference
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• 2005.05a
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• pp.155-157
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• 2005

The Electrical Test Bed(ETB) integrates the test environment, required for acceptance tests of system level, prior to FM testing. The ETB will be used for the validation of system-level functions and interface between each subsystem. The FTB supports early functional and limited performance checkout of electrical subsystems. Therefore, it provides the environment for the verification of the Flight Software including AOCS, EPS, and TC&R simulators. These ETB will be composed of engineering version of spacecraft BUS, which are laid on the laboratory table.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04b
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• pp.142-144
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• 2004

시간의 흐름에 따라 그 위치가 빈번히 변화하는 이동 객체의 특성상 실시간으로 증가하는 이동 객체의 궤적정보를 효과적으로 관리할 수 있는 효율적인 색인 기법이 요구된다. 따라서 본 논문에서는 이동 객체의 궤적을 색인하기 위해 기존에 제안되었던 TB 트리의 성능을 개선시킬 수 있는 확장된 TB-트리(Extented TB-Tree：ETB-Tree)를 제안한다. 기존의 TB 트리는 이동 객체의 궤적 세그먼트를 삽입할 때마다 선행 세그먼트를 가지고 있는 리프 노드를 찾기 위해 루트 노드부터 리프 노드까지 순회해야만 하기 때문에 불필요한 노드 접근으로 인한 오버헤드가 발생한다 이를 위해 ETB 트리는 선행 노드를 직접적으로 접근하기 위해 이동객체의 처음 세그먼트와 마지막 세그먼트가 저장된 리프 노드를 가리키는 포인터 정보와 더불어 디스크에서의 폐이지를 가리키는 페이지 번호를 별도의 테이블에 같이 유지한다. 따라서, 저장 시 동일한 이동 객체의 선행 노드를 빨리 검색할 수 있고, 궤적 질의시 직접적으로 디스크에 접근해 해당 객체의 궤적들을 검색함으로써 검색 성능을 향상시킬 수 있다. 아울러 ETB 트리는 새로운 이동 객체의 궤적 정보가 삽입될 때마다 메모리 상의 트리뿐만 아니라 디스크에 반영함으로써 트리의 일관성을 유지한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.42 no.5
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• pp.1102-1109
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• 2017

In Train Control Network(TCN), to support advanced services beyond control applications, it was revised to support high speed ethernet as IEC 61375-2-5(ETB) and IEC 61375-3-4(ECN). And Train Topology Discovery Protocol(TTDP) was included by which train-consist can be automatically configured. Meanwhile, to adopt wireless LAN as an next onboard network, TTDP need to be modified to reflect the characteristics of WLAN. This paper proposed a TTDP for WLAN using transmission power control and the number of HELLO-ACK handshake. And it determined whether the TTDP executed using the two WLAN interfaces having different bandwidths is correct or not. The proposed TTDP can allow to reduce interference from other nodes. For evaluation of performance of TTDP, NS-2 was used. The evaluation result shows the high reliability of the TTDP in wireless environment.

• Journal of Satellite, Information and Communications
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• v.12 no.3
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• pp.103-107
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• 2017

The Satellite OBC(On Board Computer) manages critical functionality such as satellite attitude control, fault management, payload management, command/telemetry processing etc. The OBC consist of various modules. Each module perform mission critical operation. So all modules designed as hot or cold redundancy architecture. The redundancy design gives a guarantee high reliability and it allows normal operation of satellite using reconfiguration capability. In this paper, introduces reconfiguration unit operation and describe the results of testing in the ETB.

• Bulletin of the Korean Space Science Society
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• 2002.10a
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• pp.77-77
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• 2002