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고재영,정진완,전병실 전북대학교 전자산업개발연구소 1991 전자산업연구 Vol.2 No.-
Nowadays, one of the most important things is data communication equipment, and among them, MODEM the most widely used equipment. In this paper, we proposed a new method for the purpose of compensating RLSD which is unstable because of channel noise of long distance telecommunication line. This method is based on transmitting staring tone at MODEM transmitter, detecting it at MODEM receiver by PLL algorithm.
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DEFECT STRUCTURE OF NONSTOICHIOMETRIC RUTILE : A Critical Review
Lee, Byung-Soo 전북대학교 전자산업개발연구소 1990 전자산업연구 Vol.1 No.-
비화학 양론적 rutile(Tio_2-x)의 결함구조에 대해서 검토했다. TiO_2-x의 결함구조는 오래전부터 점결함으로부터 접근해서 model이 제시되었고 비교적 근자에는 2차원결함에 의한 Magneli phase의 형성이 발견되었으나 점결함 농도와 Magneli phase의 shear structure 형성에 대한 관계는 밝혀진 바가 없다. 본 연구에서는 기존의 실험자료를 조사해 본 결과 점결함 농도 즉 TiO_2-x에서의 χ값이 2.0×10exp(-4)∼6.0×10exp(-4)에서 산소 vacancy가 특정결정면으로 ordering이 시작되며 이로 인해서 shear structure의 magneli phase가 형성되는 것을 밝혔다. 따라서 이 χ값에 해당하는 산소분압 이하에서는 결함구조는 점결함 모델이 아닌 Magneli phase의 extended defect model로 설명되어져야 할 것이다.
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신영석,전병실 전북대학교 전자산업개발연구소 1991 전자산업연구 Vol.2 No.-
With the emergence of high-spped LAN/MAN/WAN's a major data application of broadband ISDN(B-ISDN) is the interconnection of LAN's over a wide area, by using ATM transfer networks. In this paper, We consider two approaches which is supported connectionaless service in Boradband ISDN. First scenario is 'Case A' which supported by network indirectly and second scenario is 'Case B' which network directly. We show that connectionless service should be supplied by the Broadband ISDN itself using message handlers which support message routing and addressing, i.e., connectionless service function(CLSF), as described by the CCITT. We proposed a network topology and techinique of message handler, which reduces the routing database and avoids transit message handler overload. We show an example of system configuration and gateway architecture of LAN to LAN connetion for connection service.
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A Simple Systolic Array for Hadamard Transform
Park, Ju-yong,Lee, Moon-Ho 전북대학교 전자산업개발연구소 1990 전자산업연구 Vol.1 No.-
본 논문에서는 Hadamard 변환을 위한 간단한 시스톨릭 어레이 알고리즘을 제시한다. Hada-mard 행렬은 행과 열의 순서를 곱셈연산 함으로써 간단히 얻어지며, Hadamard 계수 발생기는 행렬 성분의 부호를 만들어, 행렬의 곱셈연산을 수행하게 된다. 이 알고리즘은 간단하면서도 높은 파이프라인 율을 제공하고, 행렬 성분의 부호는 행과 열 백터의 곱이 짝수이면 +1, 홀수이면 -1이 되어 하드웨어의 구현이 쉽다. 또한 기존의 파이트라인 방식에 비해 지연시간이 약 2배 개선되는 장점이 있고, Kung이 제안한 알고리즘 보다 출력처리가 쉽다.
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신영석,김종교,전병실 전북대학교 전자산업개발연구소 1990 전자산업연구 Vol.1 No.-
This paper presents the design and implementation of packet function for X.25 network. Packet access modules which we developed, is considered layered and modular architecture in UNIX Enviornment host of VMEbus system. In the performance of data transfer, It is capability of 120-150 DPPS(Data Packet Per Second) and can be able to portable any computer as partial modified these software and hardware.
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A New Information Fusion Method with γ-Model
Lee, Joon-Whoan 전북대학교 전자산업개발연구소 1990 전자산업연구 Vol.1 No.-
인간의 정보 융합을 흉내내기 위해서는 종래의 합(union)및 교(intersection) 연산자 이외에 보상(compensation) 특성을 갖는 연산자의 이용이 필요하다. 본 논문에서는 보상 연산자의 일종인 감마 연산자의 성질을 탐색하고, 이 연산자를 이용한 정보융합 방법을 제시하고, 실험을 통해 타당성을 입증하였다.
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김복희 전북대학교 전자산업개발연구소 1990 전자산업연구 Vol.1 No.-
Powder preparation and sintering in MgO-ZrO_2 system were studied. 1. Powders prepared by spraying method showed spherical type, no agglomeration, 1-10㎛ particle size distribution and high surface area. 2. Crystallization temperature of powders were increased with MgO content. 3. ZrO_2 ceramics with 10 mol% MgO showed high K_JC value, 15kg/㎜^3/2. 4. Tetragonal and monoclinic phase were mixed in ZrO_2 ceramics with 10 mol% MgO sintered at various temperature but only teragonal phase was in ZrO_2 ceramics with above 30 mol% MgO.
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손인진,김학신 전북대학교 전자산업개발연구소 1990 전자산업연구 Vol.1 No.-
Strengthening of austenite was investigated by shear transformation in Fe-Ni alloy. The yield strength of martensite formed from austenite by shear transformation was 54kg/㎟, which was appreciably hight than that of original austenite, 11kg/㎟. And the yield strength of reversed austenite formed from martensite by shear transformation was 42kg/㎟, which was appreciably higher than original austenite. These increase could be accounted for by grain size refinement, dislocation density increase and formed twin.
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ULSI DRAM의 BIST 알고리즘을 위한 패턴발생회로 설계
온정근,김대익,도경주,이영훈,이창기,전병실 전북대학교 전자산업개발연구소 1991 전자산업연구 Vol.2 No.-
Lately, more developed semiconductor technolgy is, higher integration per one chip is rapidly. Mow 64 Mb DRAM is used 0.3㎛ techonology. This very large integration is caused faults of new type, and exhaused much time for test. So algorithms which distiguish at higher faults coverage. less time and cost of test is reported. In this paper control circuit of Built-In Self Test(BIST) Algorithm was designed for ULSI DRAM. This circuit generates patterns of the algorithm by input clocks.
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趙俊翼,田炳實 전북대학교 전자산업개발연구소 1990 전자산업연구 Vol.1 No.-
This paper describes a new method to eliminate some selected harmonics(5, 7, 11th) is in PWM waveforms using Walsh and related orthogonal equations rquiting iterative solution methods which are not parctical real-time systems. In addition, synthesis of ow harmonic waveforms at high power system in not easy to implement with power electronic hardware. The goal of this paper is to achieve the hardware elimination in a PWM waveform by replacing the nonlinear equations in Fourier analysis with linear algebraic equations resulting from the use of orthogonal Walsh equation. This paper also describes how to synthesize low ordered harmonic waveform with practical power electronic hardware. Walsh and Radmacher functions are easioy manipulated by Harmuth's array generator, and those algorithms are accurate, computationally efficient and faster than algorithms based on Fourier analysis. In addition, this method is simulated to synthesize periodic PWM waveforms. Form experi-mental results, it is shown that a single-phase PWM waveforms are identified with the proposed method. And these methods are also extended to three-phase PWM waveform in this pa-per.
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