• Journal of information and communication convergence engineering
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• 제15권2호
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• pp.97-103
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• 2017

Implementation of faster pairing calculation is the basis of efficient pairing-based cryptographic protocol implementation. Generally, pairing is a costly operation carried out over the extension field of degree $k{\geq}12$. But the twist property of the pairing friendly curve allows us to calculate pairing over the sub-field twisted curve, where the extension degree becomes k/d and twist degree d = 2, 3, 4, 6. The calculation cost is reduced substantially by twisting but it makes the discrete logarithm problem easier if the curve parameters are not carefully chosen. Therefore, this paper considers the most recent parameters setting presented by Barbulescu and Duquesne [1] for pairing-based cryptography; that are secure enough for 128-bit security level; to explicitly show the quartic twist (d = 4) and sextic twist (d = 6) mapping between the isomorphic rational point groups for KSS (Kachisa-Schaefer-Scott) curve of embedding degree k = 16 and k = 18, receptively. This paper also evaluates the performance enhancement of the obtained twisted mapping by comparing the elliptic curve scalar multiplications.

• 제어로봇시스템학회논문지
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• 제21권9호
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• pp.881-887
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• 2015

The hardware-in-the-loop simulation (HILS) of a railway vehicle is crucial for overcoming the limitation of field tests of a railway vehicle. A brake HILS system for a railway vehicle was previously not able to test the performance of a speed-sensing system of a railway vehicle, since wheelset speeds were generated only by computer simulations. In this paper, we present a novel wheelset speed implementation of a brake HILS system for a railway vehicle. Four wheelset speeds of a brake HILS system for a car of a railway vehicle are implemented using four small-sized servomotors, whereas the speed sensors and pole wheels used in the brake HILS system are the actual ones of the railway vehicle. According to the simulated speeds of four wheelsets in the dynamic equations of motion, four servomotors generate wheel speeds in real time, and then the measured wheelset speeds are fed back to the computer simulation model. Moreover, in this paper, we improve the performance of wheelset speed measurement via the T method instead of the M method presently used in the field. The performances of wheelset speed implementation and speed-sensor operation are demonstrated by experimental works using a HILS system.

• 대한전자공학회논문지
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• 제26권2호
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• pp.10-17
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• 1989

Reed-Solomon(RS) 부호의 복호에서 오류위치다항식을 구하기 위한 알고리듬 중 Peterson에 의해 제안되고 Gorenstein과 Zierler가 개선한 알고리듬은 오류정정능력 t가 비교적 작을 경우 BerlekampMassey의 반복 알고리듬, Euclid 알고리듬을 이용한 복호, 변환영역에서의 복호보다 오류위치다항식의 계산이 간단하고 장치화에 이점이 있다. 본 논문에서는 Peterson-Gorenstein-Zieler의 알고리듬 RS부호의 부호화와 복호과정을 체계적으로 연구, 분석하고 실제로 통신 시스템에 응용할 수 있도록 유한체 GF($2^5$)의 심볼로 이루어지는 2중 오류정정(31,27)RS 부호의 부호기와 복호기를 설계하여 TTL IC로 장치화 하였다.

• 한국통신학회논문지
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• 제36권12C호
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• pp.727-737
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• 2011

본 논문에서는 FPGA(Field Programmable Gate Array)와 DSP(Digital Signal Processor)를 이용하는 실시간 차선 및 차량인식 시스템의 구현에 대하여 기술한다. 실시간 시스템의 구현을 위해서 FPGA와 DSP의 역할을 효율적으로 분할할 필요성이 있다. 시스템의 알고리즘을 특정요소 추출부분을 기준으로 분할하여 대량의 영상정보를 이용하여 소량의 특정요소를 추출하는 과정을 FPGA로 구현하고 추출된 특정요소를 사용하여 차선과 차량을 정의하고 추적하는 부분을 DSP에서 수행하게 하고, FPGA와 DSP의 효율적 연동을 위한 인터페이스 구성을 제안함으로써 실시간 처리가 가능한 시스템 구조를 제안한다. 실험 결과 제안한 실시간 차선 및 차량인식 시스템은 $640{\times}480$ 크기를 갖는 비디오 영상 입력에 대해 약 15 (frames/sec)로 동작하여 실시간 응용으로 충분함을 알 수 있다.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2008년도 춘계 종합학술대회 논문집
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• pp.851-854
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• 2008

지식기반사회에서 국가경쟁력을 이끌 미래성장분야인 과학기반산업은 기술개발시 과학의존도가 높은 분야이며, 기술개발시 핵심 학술문헌에 대한 의존도가 절대적이다. 연구개발자들의 기술개발과 관련된 학술논문에 대한 요구와 링크서비스 기술의 발전은 유럽특허와 이 특허에 인용된 학술논문간 연계서비스를 가능하게 하였다. 이 논문은 유럽특허의 서치리포트에 수록된 과학논문을 이용하여 과학논문간 연계서비스를 구현한 사례를 기술하는데 목적이 있다. 해외에서 제공되는 특허와 문헌간연계서비스 현황을 살펴보고, 특허와 문헌간 원문연계서비스를 위해 필요한 데이터를 기술하며, 이종 콘텐트간 연계서비스의 구현사례를 기술한다.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 1998년도 The Third Asian Fuzzy Systems Symposium
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• pp.489-494
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• 1998

This paper describes a design of graphical user interface for a simulated breeding tool with multifield. The term field is used here as a population of visualized individuals that are candidates of selection. Multi-field interface enables the user to breed his/her favorite phenotypes by selection independently in each field, and he/she can copy arbitrary individual into another field. As known on genetic algorithms, a small population likely leads to premature convergence trapped by a local optimum, and migration among plural populations is useful to escape from local optimum. The multi-field user interface provides easy implementation of migration and wider diversity. We show the usefulness of multi-field user interface through an example of a breeding system of 2D CG images.

• Journal of information and communication convergence engineering
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• 제6권4호
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• pp.411-416
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• 2008

When compose magnetic field curer by belt and band style and need by magnetic field ripple last month, produce self-discipline roof. Bred in muscle disease (lumbago, backbone disease, corpulence) back. Result that study, manufactured various variableness band style - magnetic field probe firstly. Can establish self-discipline treatment pulse price by disease secondly. Could seek correct variableness band punishment, - magnetic field probe relationship implementation and property in waist, and so on, shoulder, neck, arm, leg, ankle, wrist etc. by third. Could find variableness band style energy value that need in-magnetic field Probe's treatment by fourth. This research could design pulse of self-discipline in band form and apply each according to disease.

• Journal of Information Technology Applications and Management
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• 제15권1호
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• pp.203-224
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• 2008

The purpose of this study is to investigate the evaluation perspectives of IT business value and empirically analyze the differences of evaluation perspectives between ex ante evaluation and post implementation evaluation, and among various information system types. 4 evaluation perspectives which have been used in the previous studies and in the field of industry practices are financial, customer, internal process, and growth, which are based on the BSC model. Data of 98 information systems have been collected from 89 companies including manufacturers, banks, insurances, and stock trading companies. As results of multi-way MANOVA test, 3 out of 8 hypothesis have been accepted statistically. While the order of importance of 4 perspectives in ex ante evaluation is customer, financial, internal process, and growth, the order of post implementation evaluation appears to be much different : that is, internal process, customer, financial, and growth. These findings provide insights for both IT practitioners and researchers.

• 한국철도학회논문집
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• 제9권4호
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• pp.473-481
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• 2006

This study attempts to estimate economic benefits in terms of cost sayings and qualitative effects resulting ken implementation of new vehicle maintenance information system. It is widely expected that the effect of new vehicle maintenance information system will be significant in cost savings by information sharing and electronic documentation. To evaluate the economic feasibility of new system implementation, the study conducted seven subsystems case studies on the vehicle maintenance information system of Seoul Metro. Economic benefits are estimated by measuring the time savings, in turn, are calculated into cost savings by multiplying the average wages per hour of employee. The result of case study showed that over the 20 billion Won will be saved owing to new vehicle information system implementation. In conclusion, this study will contribute to the field of practices for the most, in evaluation of the economic benefits resulting from new information system implementation in the railway organization.

• 제어로봇시스템학회논문지
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• 제8권1호
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• pp.54-59
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• 2002

In the three-axis control of satellites by using on-board actuators, gyros are usually used to measure the attitude angles and angular rates. The gyros are operated by electronic parts and mechanical actuators. The digital components of the electronic parts consist of largely FPGA (Field Programmable Gate Array) as one of the methods for VLSI(Very Large Scale Integrated) circuit design, while the mechanical parts provide output signal directly by mechanical actuation of a spinning rotor. In this research, a mixed mode of gyro is implemented in FGA. In addition to the hardware implementation, the simulation study was conducted by using the SABER for the mixed mode simulator. Results for the practical implementation of the satellite ACS (Attitude Control System) interfaced with the data processing are also presented to validate the FPGA implementation.