• Title/Summary/Keyword: Protect Device

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A Cryptographic Model to Protect Private Information against Malicious Proxy in Jini (악의적 지니 프록시로부터 비밀 정보 보호를 위한 암호학적 모델)

  • Yang Jong-Phil;Rhee Kyung-Hyune
    • The KIPS Transactions:PartC
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    • v.13C no.1 s.104
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    • pp.27-34
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    • 2006
  • In the near future, people will wish to access many kinds of heterogeneous networks to use their services anytime and anywhere. Owing to the heterogeneity of networks, there must be many kinds of protocols to guarantee secure services. The mobile device can depend in a middleware for accessing services in the heterogeneous networks and the middleware helps the mobile device to communicate with services without blowing concrete protocols. If a secure channel is necessary, the middleware may access a private key in the mobile device to perform a security protocol. In this paper, we focus on the security of a private key in the mobile device against malicious middlewares. To do so, we introduce two models for a user to protect his/her private key against malicious middlewares by generating authentication data(e.g., digital signatures) without keeping the private key in the mobile device.

Measurement of Skin Dose Distribution for the Mobile X-ray Unit Collimator Shielding Device (이동형 X선 장치 차폐도구 제작을 통한 표면선량 분포 측정)

  • Hong, Sun-Suk;Kim, Deuk-Yong
    • Korean Journal of Digital Imaging in Medicine
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    • v.12 no.1
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    • pp.5-8
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    • 2010
  • Opened a court in February 10, 2006, a rule of safety management of the diagnosis radiation system was promulgated for safety of the radiation worker, patients and patients' family members. The purpose of this rule is to minimize the risk of being exposed to radiation during the process of handling X-ray. For this reason, we manufactured shielding device of mobile X-ray unit collimator for diminution of skin dose. Shielding device is made to a thickness of Pb 0.375mm. For portable chest radiography, we measured skin dose 50cm from center ray to 200cm at intervals of 20cm by Unfors Xi detector. As a result, a rule of safety management of the diagnosis radiation system has been strengthened. But there are exceptions, such as ER, OR, ICU to this rule. So shielding device could contribute to protect unnecessary radiation exposure and improve nation's health.

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Imaging Device Identification using Sensor Pattern Noise Based on Wiener Filtering (Wiener 필터링에 기반하는 센서 패턴 노이즈를 활용한 영상 장치 식별 기술 연구)

  • Lee, Hae-Yeoun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.12
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    • pp.2153-2158
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    • 2016
  • Multimedia such as image, audio, and video is easy to create and distribute with the advance of IT. Since novice uses them for illegal purposes, multimedia forensics are required to protect contents and block illegal usage. This paper presents a multimedia forensic algorithm for video to identify the device used for acquiring unknown video files. First, the way to calculate a sensor pattern noise using Wiener filter (W-SPN) is presented, which comes from the imperfection of photon detectors against light. Then, the way to identify the device is explained after estimating W-SPNs from the reference device and the unknown video. For the experiment, 30 devices including DSLR, compact camera, smartphone, and camcorder are tested and analyzed quantitatively. Based on the results, the presented algorithm can achieve the 96.0% identification accuracy.

A Study on the application of TVS for snubber (스너버 회로를 위한 TVS 소자의 활용 연구)

  • Lee Wan-Yun;Chung Gyo-Bum
    • Proceedings of the KIPE Conference
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    • 2002.11a
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    • pp.227-230
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    • 2002
  • The switching device in an inductive circuit is stressed by the over-voltage at the turn-off time. Thus if the peak value of the over-voltage is not properly limited, the switching device may be broken. Therefore, the snubber circuit should be added to protect the switching device from the over-voltage. The circuit designer must be familiar with the design of the snubber This paper tests the possibility that TVS instead of the conventional snubber can be applied to the protection circuit of the switching device without using the complicated design equations, and shows that the rating of TVS can be easily selected by considering only several parameters of TVS. The experimental results show the reduced switching voltage of the switching device at the turn-off time.

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Thin film encapsulation of thin-cathode organic electroluminescent devices

  • Lee, Shih-Nan;Hwang, Shiao-Wen;Chen, Chin H.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2006.08a
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    • pp.1034-1037
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    • 2006
  • We have developed a novel thin film encapsulation method for thin-cathode OLED by introducing organic (not polymer)/inorganic multiple thin films to protect device, which is shown to slow down the permeation rate of moisture and oxygen. From the stability test of devices, the projected lifetime of thin-cathode OLED device with thin film encapsulation was similarly to that with glass lid encapsulation.

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Power system protection IED design using an embedded processor (임베디드 프로세서를 이용한 계통 보호 IED 설계)

  • Yoon, Ki-Don;Son, Young-Ik;Kim, Kab-Il
    • Proceedings of the KIEE Conference
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    • 2004.11c
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    • pp.711-713
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    • 2004
  • In the past time, the protection relay did only a protection function. Currently, its upgraded device i.e. IED(Intelligent Electric Device) has been designed to protect, control, and monitor the whole power system automatically. Also the device is desired to successfully measure important elements of the power system. This paper considers design method of a digital protection IED with a function of measuring various elements and a communication function. The protection IED is composed of the specific function modules that are signal process module, communication module, input/output module and main control module. A signal process module use a DSP processor for analysis of input signal. Main control module use a embedded processor, Xscale, that has an ARM Core. The communication protocol uses IEC61850 protocol that becomes standard in the future. The protection IED is able to process mass information with high-performance processor. As each function module is designed individually, the reliability of the device can be enhanced.

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Design and Implementation of Certificate Revocation List Acquisition Method for Security of Vehicular Communications

  • Kim, Hyun-Gon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37 no.7C
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    • pp.584-591
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    • 2012
  • Distributing a Certificate Revocation List (CRL) quickly to all vehicles in the system requires a very large number of road side units (RSUs) to be deployed. In reality, initial deployment stage of vehicle networks would be characterized by limited infrastructure as a result in very limited vehicle to infrastructure communication. However, every vehicle wants the most recent CRLs to protect itself from malicious users and malfunctioning equipments, as well as to increase the overall security of the vehicle networks. To address this challenge, we design and implement a nomadic device based CRL acquisition method using nomadic device's communication capability with cellular networks. When a vehicle could not directly communicate with nearby RSUs, the nomadic device acts as a security mediator to perform vehicle's security functions continuously through cellular networks. Therefore, even if RSUs are not deployed or sparsely deployed, vehicle's security threats could be minimized by receiving the most recent CRLs in a reasonable time.

The basic study on the design of the Light Collision Safety Device (경충돌안전장치 설계를 위한 기초연구)

  • Choi, Won-Mog;Jung, Hyun-Sung;Yu, Won-Hui;Ku, Jung-Seo;Kwon, Tae-Su
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.238-244
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    • 2006
  • The Light Collision Safety Device is used to protect the important part of trains and passengers at the low velocity accidents. The Light Collision Safety Device comprises mainly tension bolts, shear bolts and an energy absorber. The work mechanism of this device is that first, the tension bolts break at designed collapse load and second, the energy absorber absorb rest collision energy. In this paper, the tension bolt characteristics were validated by the simple tension test using the FEM(Finite Element Method) and the characteristic of the two types of energy absorber were compared by using the load-displacement curves and absorbed energy. Last, in order to determine integrated load-displacement curve of tension bolts and the energy absorber, the unified analysis was conducted by using the FEM.

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A Preliminary Study of Quality Certification System for Geo-Spatial Information Device (공간정보 기기 품질인증을 위한 기초연구)

  • Kim, Jae-Myeong;Choi, Yun-Soo;Seo, Jae-Pil;Chang, Eun-Mi
    • Spatial Information Research
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    • v.19 no.4
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    • pp.33-43
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    • 2011
  • Countries all over the world have been operating various certification systems to protect their consumers, and these systems have become trade barriers between countries. Also, KS and KCC were not designed to reflect characteristics of Geo-Spatial Information Device. The purpose of this study was to derive the plan of Quality Certification System for Geo-Spatial Information Device through the analyses of the existing Quality Certification System. The results of this study were as follows. Firstly, we defined the concept of Quality Certification System for Geo-Spatial Information Device. Secondly, we set the boundary, factors and process of Quality Certification System for Geo-Spatial Information Device through classifying it in detail. Lastly, we suggested about fundamental concept of Quality Certification System for Geo-Spatial Information Device a the analyses of the existing Quality Certification System.