• Title/Summary/Keyword: Device identification

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The design concept of the On-Board Computer System using identification coding method (차상컴퓨터장치 식별 코딩 설계방법에 대한 연구)

  • Choi, Kwon-Hee;Ra, Joon-Ho;Shim, Jae-Chul;Kim, Hyung-In;Jung, Sung-Yun
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.1398-1402
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    • 2007
  • In a high speed train, OBCS(On-Board Computer System) is a up-to-date computer control system that provide controlling, monitoring, maintaining and reparing of the important device, supporting a driver, status of a train, service maintenance, managing the remote control mode, driving order & control, control of a electrical or pneumatic circuit and a passenger service. In general, OBCS is located in each car but in a power car, both main and auxiliary computers are used. These avoid a network collision and maintain the independence of condition and failure records with the information of line number, train number and car number. This paper is intended to provide the information about the identification coding method of domestic and foreign OBCS, for the new high speed train (KTX-II).

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Experimental Identification of the Longitudinal Wave Propagation Speed in Fluid-filled Elastic Hose (유체 충진 탄성호스 내의 길이 방향 파동 전파속도에 관한 실험적 규명)

  • Kwon, O-Cho;Joh, Chee-Young
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2000.06a
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    • pp.804-810
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    • 2000
  • In this paper, an experimental identification method is presented to identify the bulge wave and extensional wave propagation speeds in the fluid-filled elastic hose. An fluid-filled hose is hanged vertically for straight position. The exciting device of piston type is developed to generate the bulge wave and extensional wave in the elastic hose. Hydrophones are arranged in the fluid-filled hose linearly to measure the wave pressure. The wave speeds are estimated using the wavenumber-frequency spectrum analysis technique.

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Vibration Exciter Design for Flow Resonance (유동공진을 위한 가진기 설계)

  • Nam, Yoon-su;Choi, Jae-hyuck
    • Journal of Industrial Technology
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    • v.20 no.B
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    • pp.125-130
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    • 2000
  • Heat dissipation technology using flow resonant phenomenon is a kind of new concept in heat transfer area. A vibration exciter is needed to generate air turbulence which has the natural shedding frequency of heat system. A mechanical vibrating device for the air flow oscillation is introduced, which is driven by a moving coil actuator. An analytical dynamic model for this mechanical vibration exciter is presented and its validity is verified by the comparison with experimental data. Values of some unknown system parameters in the analytic model are estimated through the system identification approach. Based on this mathematical model, a high bandwidth vibration phase, it turns out the high modal resonant characteristics of vibrating plate are the major barrier against obtaining a high bandwidth vibration exciter.

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Noble Approach of Linear Entropy based Image Identification (영상 인식자를 위한 선형 엔트로피 기반 방법론)

  • Park, Je-Ho
    • Journal of the Semiconductor & Display Technology
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    • v.18 no.3
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    • pp.31-35
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    • 2019
  • Human beings have been fascinated by the applicability of the medium of photography since the device was first introduced in the thirteenth century to acquire images by attempting primitive and rudimentary approaches. In the 21st century, it has been developed as a wide range of technology that enables not only the application of artistic expression as a method of replacing the human-hand-painted screen but also the planar recording form in the format of video or image. It is more effective to use the information extracted from the image data rather than to use a randomly given file name in order to provide a variety of services in the offline or online system. When extracting an identifier from a region of an image, high cost cannot be avoided. This paper discusses the image entropy-based approach and proposes a linear methodology to measure the image entropy in an effort to devise a solution to this method.

A Study on the Identification of Electrical Eire -Focused on Distance Analysis of Electrical Wires by Overcurrent- (전기화재의 감식에 관한 연구 -과전류 사고시 전선의 이격거리 분석을 통하여-)

  • 이상호;김준식;오홍석
    • Fire Science and Engineering
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    • v.18 no.2
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    • pp.7-11
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    • 2004
  • In this paper, we have simulated the force between the two electrical wires using the finite element method(FEM) according to the value of current and distance when overcurrent flows in the vinyl-insulated vinyl-cabtyre cord(flat-type, 600 V, VCTFK, $2C{\times}1.25mm^2$). And we will present the basic data for the identification of electrical fire by experiment for maximum distance between the two wires according to current and time using large current supply device(Model : EHT_EFAD, Korea) in case of overcurrent.

Ergonomic Design of Necklace Type Wearable Device

  • Lee, Jinsil;Ban, Kimin;Choe, Jaeho;Jung, Eui S.
    • Journal of the Ergonomics Society of Korea
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    • v.36 no.4
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    • pp.281-292
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    • 2017
  • Objective: This study aims to identify important physical design variables in designing a necklace type wearable device, and to present design guidelines to maximize comfort that a user feels upon wearing the device. Background: Interests in fitness culture and personal health are on the rise recently. In such a situation, demand for necklace type wearable devices is projected to increase a lot, as the devices enable users to use their hands freely and to enjoy various contents through connection with mobile devices. However, the necklace type wearable device's comfort was assessed to have the lowest comfort in a running situation, where human body moves up and down and left and right more than other devices wearable on other human body parts. Therefore, the usability of a necklace type wearable device was low. In this regard, studies on identification of the variables affecting user comfort upon wearing a necklace type wearable device and on physical design direction maximizing comfort and usability are needed. Method: A pretest and a main test were carried out to draw the direction of necklace type wearable device design. In the pretest, wearing evaluation on the diverse types of devices released in the market was conducted to draw physical design variables of the devices affecting comfort. Furthermore, variables significantly affecting the comfort of a device were selected through an analysis of variance (ANOVA). In the main test, anthropometry was performed, and information on anthropometric items corresponding to the design variables selected in the pretest was acquired. Based on the pretest results and the anthropometric information in the main test, the present study produced design guidelines maximizing the comfort of a necklace type wearable device with regard to major design variables upon dynamic tasks. Results: According to the pretest results, the variables having effects on comfort were the angle of side points, width, and height. Due to interactions between variables, those need to be simultaneously considered upon designing a device. Upon dynamic tasks, the angle of side points and width of a device was designed to be smaller than mean angle of the trapezius muscle and neck width, and thus attachment to human body was high. As height was designed to be larger than mean neck front and rear point width, comfort was higher due to feeling of stability. Conclusion: Because user sensitivity to comfort was high at human body's inflection points, a device needs to be designed for users not to feel high pressure on specific body parts with the device fitting human body shape well. A design considering user's situation is also required in further studies.

Printer Identification Methods Using Global and Local Feature-Based Deep Learning (전역 및 지역 특징 기반 딥러닝을 이용한 프린터 장치 판별 기술)

  • Lee, Soo-Hyeon;Lee, Hae-Yeoun
    • KIPS Transactions on Software and Data Engineering
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    • v.8 no.1
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    • pp.37-44
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    • 2019
  • With the advance of digital IT technology, the performance of the printing and scanning devices is improved and their price becomes cheaper. As a result, the public can easily access these devices for crimes such as forgery of official and private documents. Therefore, if we can identify which printing device is used to print the documents, it would help to narrow the investigation and identify suspects. In this paper, we propose a deep learning model for printer identification. A convolutional neural network model based on local features which is widely used for identification in recent is presented. Then, another model including a step to calculate global features and hence improving the convergence speed and accuracy is presented. Using 8 printer models, the performance of the presented models was compared with previous feature-based identification methods. Experimental results show that the presented model using local feature and global feature achieved 97.23% and 99.98% accuracy respectively, which is much better than other previous methods in accuracy.

The Secure Key Store to prevent leakage accident of a Private Key and a Certificate (인증서와 개인키 유출 방지를 위한 보안키 저장소 Secure Key Store)

  • Park, Young-Jin;Kim, Seon-Jong;Lee, Dong-Hoon
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.24 no.1
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    • pp.31-40
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    • 2014
  • In Korea, the Public Key Infrastructure (PKI) has been introduced. For secure information transmission and identification, the electronic signature authorization system of a certificate-based is built, and then the service provide.The certificate is stored in location what users can easily access and copy. Thus, there is a risk that can be stolen by malware or web account hacking. In addition, private key passwords can be exposed by the logging tool, after keyboard security features are disabled. Each of these security weaknesses is a potential conduit for identity theft, property/asset theft, and theft of the actual certificates. The present study proposes a method to prevent the private key file access illegally. When a certificate is stored, the private key is encrypted by the dependent element of the device, and it is stored securely. If private key leakage occurs, the retrieved key could not be used on other devices.

Development of Odorant Sensor System using Six Channel Lipid-Coated SAW Resonator Devices imitating the Olfactory Mechanizm (후각 메카니즘을 모방한 냄새 센서의 개발 연구)

  • Chang, Sang-Mok;Isao, Karube
    • Proceedings of the KOSOMBE Conference
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    • v.1991 no.05
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    • pp.98-100
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    • 1991
  • A sensitive surface acoustic wave (SAW) sensor for the detection of odorants has been constructed by depositing different phospholipids and fatty acids on the surface of the SAW device wi th the Langmuir-Blodgett technique. The characteristics of SAW device operating at 310 MHz deposited with phosphatidylcholine were analyzed. Amyl acetate, acetoin, menthone and other organic gases showed different affinities. The identification of odorants depending on the species of lipid used for coating is discussed in terms of the similarity of the normalized resonant frequency shift pattern. Using a number of different lipid-coated SAW devices, odorants could be identified by a neural-network pattern recognition with back-propagation algorithm.

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Implementation of Personalized IP Streaming System (맞춤형 IP 스트리밍 시스템 구현)

  • Yang, Chang-Mo;Kim, Kyung-Won;Lim, Tae-Beom;Kim, Yoon-Sang;Lee, Seok-Pil
    • Proceedings of the KIEE Conference
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    • 2006.10c
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    • pp.515-517
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    • 2006
  • Recently, there is a rapidly growing demand for efficient real-tine playback and transmission of large amounts of multimedia data. But most users' connections are not fast enough to download large chunks of multimedia data. Therefore a streaming technology is needed in which users enable the real-time playback of multimedia date without having to download the whole of the multimedia date. In this paper, we propose a personalized IP streaming system. The proposed IP streaming system enables users to got an intelligent recommendation of multimedia contents based on the user preference information stored on the streaming server or the home media server. Moreover, users are assured of seamless access of streamed content event if they switch to another client device by implementing streaming system based on user identification and device information. We evaluate our approach with simulation results.

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