Browsing by Issue Date, starting with "1993-09-01"

Now showing 1 - 20 of 89518

CHARGE LOSS DUE TO AC PROGRAM DISTURBANCE STRESSES IN EPROMS
(1993-09-01)
LIN, JK
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CHANG, CY
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WANG, TH
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HUANG, HS
;
CHEN, KL
Charge loss in interpolyoxide erasable programmable read-only memories (EPROMs) due to program disturbance by alternating current pulses applied to the drain was studied for the first time. It was found that the charge loss due to ac stress is more severe than that due to dc stress. Experimental results reveal that the more positive the floating gate potential, the more severe is the drain ac disturbance observed. The main reason for the charge loss is the displacement current which agitates the charges in the floating gate, creating a leakage path from the floating gate to the drain, in which the drain-to-floating-gate overlapping capacitance C(fd) plays an important role. The drain dc stresses of interpolyoxide/nitride/oxide (ONO) EPROMs were also measured under different bias conditions and temperatures. The data show that higher dc electric field of the floating gate to the drain results in larger V(th) shift, which can be accelerated by elevated temperature. In addition, the control gate ac stress-enhanced drain dc disturbance was also measured. We proposed that the dc drain stress is applied during the ac gate stress, which results in a heating effect. The results support the concept of dielectric ac heating.
BINARY PARTITION ALGORITHMS AND VLSI ARCHITECTURES FOR MEDIAN AND RANK ORDER FILTERING
(1993-09-01)
LEE, CL
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JEN, CW
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電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
A class of selection algorithms by binary partition is very efficient for median and rank order filtering. A unified discussion of these algorithms is presented. Binary partition algorithms have better time-area complexity than sorting methods. Counting, firing, and updating are three basic steps. A generic structure is proposed to realize these algorithms. They can be implemented by simple and regular modules in VLSI.
NONPERTURBATIVE DEFORMATION OF CONFORMAL FIELD-THEORY AND SPONTANEOUSLY BROKEN INTER MASS LEVEL SYMMETRIES IN STRING THEORY
(1993-09-01)
LEE, JC
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交大名義發表
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電子物理學系
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National Chiao Tung University
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Department of Electrophysics
We study the deformation of conformal field theory without leaving the fixed points. It is found that an infinite number of higher spin background fields are needed to cancel the q-number anomalies when one goes beyond first order weak field calculation. This phenomenon can be interpreted in string theory as spontaneously broken symmetries between particles with different masses.
COMMENTS ON A NEURAL-NETWORK APPROACH TO MVDR BEAMFORMING PROBLEM - REPLY
(1993-09-01)
CHANG, PR
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YANG, WH
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CHAN, KK
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交大名義發表
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電信工程研究所
REGULAR ENUMERATION OF GRID POINTS IN A CONVEX POLYGON
(1993-09-01)
Lee, Hsuan-Shih
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Chang, Ruei Chuan
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資訊工程學系
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Department of Computer Science
In this paper we present an efficient algorithm for enumerating all the grid points in a convex polygon, where the enumeration is done by scanning the grid points with a set of parallel grid lines. Given a convex n-gon, enumeration can be done in O(K + + log min{root l/omega, l}) time, where K is the number of the grid points reported, l is the diameter of the polygon and omega is the length of the shorter sides of the rectangle enclosing the polygon with longer sides parallel to the line segment connecting the diametral pair of the polygon. We also show that the ratio of the number of the scanned grid lines to the minimal is less than some constant.
A NEW APPROACH TO DETERMINE THE DRAIN-AND-SOURCE SERIES RESISTANCE OF LDD MOSFETS
(1993-09-01)
CHUNG, SSS
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LEE, JS
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電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
A new method for determining the intrinsic drain-and-source series resistance and the effective channel length of LDD MOSFET's is proposed. The method is based on the experimentally measured device I-V characteristics and a new parameter extraction procedure. A consistent set of the effective channel length and the gate-voltage-dependent drain-and-source series resistance was thus determined. The comparison between the measured and experimental drain current characteristics shows excellent agreement using the present model values.
AN OPTIMUM PARTITION FOR INVERTING A NONSINGULAR MATRIX
(1993-09-01)
LUO, JC
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交大名義發表
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土木工程學系
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National Chiao Tung University
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Department of Civil Engineering
A new strategy for inverting a nonsingular matrix is evaluated in this paper. The essential concept of this strategy is to partition a nonsingular matrix into blocks, then to apply the author's decomposition to the block-based procedure. Since different partitions require different costs, finding an economical partition is necessary. This paper studies the optimum partition so that the complexity for the inverse of a nonsingular matrix may be significantly reduced.
ELECTRONIC-ENERGY SPECTRUM IN AN ASYMMETRIC QUANTUM-WELL WITH A CROSSED MAGNETIC AND ELECTRIC-FIELD
(1993-09-01)
WANG, CS
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CHUU, DS
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電子物理學系
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電控工程研究所
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Department of Electrophysics
The energy spectra of an electron in an asymmetric quantum well within an in-plane magnetic field and an electric field perpendicular to the barrier interfaces are exactly derived and the numerical results are calculated by iteration. The ground and excited states are calculated for various asymmetric potential barriers, well widths and electric fields. Major different characteristics of energy spectra between wide and narrow wells are discussed. The behaviors of a bulk Landau level in the well region of a larger well width and the elevation of the ground state in a smaller well width are explained. The density distribution of electrons in a large well region is strongly affected by the barrier ratio and the electric field in the growth direction.
TYPE SYNTHESIS OF VEHICLE PLANAR SUSPENSION MECHANISM USING GRAPH-THEORY
(1993-09-01)
LIU, TS
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CHOU, CC
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交大名義發表
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機械工程學系
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National Chiao Tung University
This paper presents a graph theory-based approach to optimum type synthesis of vehicle suspension mechanisms using an expert system. Kinematic chain isomorphism is identified, using an extended degree method to facilitate the enumeration of kinematic structures. Rules representing design criteria and the flow value theory based on energy loss calculation are incorporated in the rule base to evaluate and select mechanisms among those that are enumerated in the database. Statistical variance calculation serves to complement the flow value theory. A new method called the extended flow value method is devised for isomorphism checking of labeled graphs. In the spirit of increasing emphasis on the riding quality of vehicles, several novel suspension configurations are created to ensure maintenance ease and vibration damping efficiency.
COMPUTER-BASED ENVIRONMENT FOR WASTE-WATER TREATMENT-PLANT DESIGN
(1993-09-01)
KAO, JJ
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BRILL, ED
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PFEFFER, JT
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GESELBRACHT, JJ
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環境工程研究所
A prototype computer-based design environment was developed to facilitate wastewater treatment plant design tasks. The design environment includes several mathematical techniques, interactive graphic displays, and user-friendly interfaces. The mathematical techniques are mass and water balances for an analysis program for plant design and a rule-based system for evaluating the likelihood of sludge bulking. A processor is also used to check a given design using existing design standards. The interactive graphic displays and the user interfaces are intended to provide a user-friendly environment for manipulating data, models, and solutions. Sensitivity analyses can be performed for models as well as parameters. The features of the computer-based system are described, and suggestion for extensions are given.
HYDROGENATED AMORPHOUS-SILICON CARBIDE DOUBLE GRADED-GAP P-I-N THIN-FILM LIGHT-EMITTING-DIODES
(1993-09-01)
SHIN, NF
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CHEN, JY
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JEN, TS
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HONG, JW
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CHANG, CY
Hydrogenated amorphous silicon carbide (a-SiC:H) p-i-n thin-film light-emitting diodes (TFLED's) with graded p+-i and i-n+ junctions have been proposed and fabricated successfully on an indium-tin-oxide (ITO)-coated glass. An obtained orange TFLED reveals a brightness of 207 cd/m2 at an injection current density of 600 mA/cm2, which is the brightest one ever reported for a-SiC:H TFLED's at the same injection current density. This significant increase of brightness could be ascribed to the combined effect of reduced interface states by using the graded-gap junctions, lower contact resistance due to post-metallization annealing, and higher optical gaps of the doped layers.
CORROSION BEHAVIOR OF ELECTROLESS NICKEL-PLATING MODIFIED TIN COATING
(1993-09-01)
DOONG, JC
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DUH, JG
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TSAI, SY
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WANG, JH
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CHIOU, BS
TiN films were prepared by reactive r.f. magnetron sputtering on low carbon steel substrates. An electroless Ni-P plating was introduced as the interlayer in the modification of the TiN coating. The corrosion behaviour of the TiN coating assembly was evaluated using the salt spray test and the polarization technique. For a thicker Ni-P interlayer (greater than 5 mum), no appreciable corrosion was observed up to hundreds of hours after salt spray testing. The polarization curve indicates a barrier-type passive film in the TiN/Ni3P/Fe coating assembly. The corrosion currents for TiN/Fe, Ni3P/Fe and TiN/Ni3P/Fe are 200, 40-70 and 6-7 muA cm-2 respectively. It appears that the electroless Ni-P interlayer modified TiN coating has better anticorrosion resistance than pure TiN coating on low carbon steel.
ECONOMICS OF PARK-AND-SHOP DISCOUNTS - A CASE OF BUNDLED PRICING STRATEGY
(1993-09-01)
LAN, LW
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KANAFANI, A
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運輸與物流管理系註：原交通所+運管所
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Department of Transportation and Logistics Management
The economic implications of two ''park-and-shop'' discount programmes are analysed. These are a no-bundling strategy (no parking discount to shoppers) and a mixed-bundling strategy (parking discount to shoppers). Supplier surplus and total social surplus models are formulated through a two-item example and their corresponding optimal discounts are determined. The implications for seller profit and total social surplus are presented.
ON THE ROBUSTNESS OF THE STABILITY OF LYAPUNOV-TYPE STATE-FEEDBACK SYSTEMS
(1993-09-01)
CHENG, CF
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WANG, WJ
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LIN, YP
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電控工程研究所
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Institute of Electrical and Control Engineering
A generalized Lyapunov-type state feedback design for uncertain systems is proposed. Based on the solution of the proposed Lyapunov-type equation, bounds of the nonlinear (linear), time-varying/invariant uncertainties are obtained to maintain the system's stability. No statistical description of uncertain elements is assumed, and it is not necessary for the so-called ''matching condition'' to be satisfied, either.
CALCULATIONS AND MODELING OF GRAIN-BOUNDARY ACCEPTOR STATES FOR (BA,PB)TIO3 POSITIVE TEMPERATURE-COEFFICIENT CERAMICS
(1993-09-01)
LAI, CH
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LU, YY
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TSENG, TY
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電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
The electrical properties of high-Curie-point positive temperature coefficient of resistance ceramics of composition Ba0.497Pb0.5La0.003Ca0.005Ti0.995O3 prepared from commercial BaTiO3 powder were studied. The acceptor-state energy and acceptor-state density were determined from the calculated rho(max) vs T(max) plot, where rho(max) and T(max) are the resistivity and temperature corresponding to the maximum in resistivity. These two parameters, combined with the effect of nonvanishing spontaneous polarization below the Curie point, were treated quantitatively to demonstrate the dependence of measured resistivity rho(dc) on the measured permittivity epsilon(m). The obtained values of potential barrier height and acceptor-state density based on the procedure above were found to be in excellent agreement with those extracted from the slope in the Arrhenius plots of resistivity versus 1/(Tepsilon(m)), where T is the absolute temperature. Also, the deviation of the measured dielectric constant epsilon(m) from the Curie-Weiss law's prediction was explained by the narrowing of the grain-boundary barrier layers.
OUTAGE COSTS CAUSED BY VARIOUS OUTAGE DEPTHS
(1993-09-01)
HSU, GJY
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CHANG, PL
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CHEN, TY
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交大名義發表
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管理科學系
This paper examines the quantitative relationship between power customers' outage costs and their outage depths. Taiwan's cement industry has been chosen as a study case. Thirteen factories were surveyed and, based on this, the survey data of the factories were subject to analyses of variance and covariance. We conclude that an appropriate priority service rate should be designed to meet the curtailable load covering the cement milling and raw milling stage, which represents 68% of the customers' contracted load. The corresponding outage cost of the cement factory is $1.05/kWh. Areas for further research are also suggested in this paper.
PHASE-TRANSFORMATIONS IN AN FE-7.8AL-29.5MN-1.5SI-1.05C ALLOY
(1993-09-01)
CHAO, CY
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LIU, TF
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機械工程學系
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材料科學與工程學系
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Department of Mechanical Engineering
Phase transformations in an Fe-7.8Al-29.5Mn-1.5Si-1.05C alloy have been investigated by means of optical microscopy and transmission electron microscopy. In the as-quenched condition, a high density of fine (Fe,Mn)3AlC carbides could be observed within the austenite matrix. When the as-quenched alloy was aged at temperatures ranging from 550-degrees-C to 825-degrees-C, a gamma --> coarse (Fe,Mn)3AlC carbide + DO3 reaction occurred by a cellular precipitation on the gamma/gamma grain boundaries and twin boundaries. Both of the observations are quite different from those observed by other workers in Fe-Al-Mn-C alloys. In their studies, it was found that the as-quenched microstructure was austenite phase (gamma), and (Fe,Mn)3AlC carbides could only be observed within the austenite matrix in the aged alloys. In addition, a gamma --> alpha (ferrite) + coarse (Fe,Mn)3AlC carbide reaction or a gamma --> alpha + coarse (Fe,Mn)3AlC carbide + beta-Mn reaction was found to occur on the gamma/gamma grain boundary in the aged Fe-Al-Mn-C alloys.
THE DESIGN OF FULLY DIFFERENTIAL CMOS OPERATIONAL-AMPLIFIERS WITHOUT EXTRA COMMON-MODE FEEDBACK-CIRCUITS
(1993-09-01)
LU, PH
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WU, CY
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TSAI, MK
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電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
A new fully differential CMOS operational amplifier (op amp) without extra common-mode feedback (CMFB) circuit is proposed and analyzed. In this op amp, simple inversely connected current-mirror pairs are used as active loads. From the theoretical analysis, it is shown that the common-mode signal can be efficiently suppressed by the reduced effective common-mode resistance of the active load. The proposed op amp with 2 pF capacitance loadings has an open-loop unity-gain bandwidth of 63 MHz, a phase margin 47-degrees, and a dc gain of 67 dB in 3.5 mum p-well CMOS technology. The common-mode gain at a single output node can be as low as -38 dB without extra CMFB circuit. Experimental results have successfully confirmed the capability of the efficient common-mode rejection.
TRANSMISSION CHARACTERISTICS OF FINITE-WIDTH CONDUCTOR-BACKED COPLANAR WAVE-GUIDE
(1993-09-01)
TIEN, CC
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TZUANG, CKC
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PENG, ST
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CHANG, CC
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傳播研究所
This paper presents theoretical and experimental results for a finite-width conductor-backed coplanar waveguide (FW-CBCPW). The guiding characteristics of FW-CBCPW are investigated first by the rigorous method of mode matching. An FW-CBCPW through line is then placed within a test fixture commonly used in laboratories, and the scattering parameters of the through line are obtained theoretically by approximating the FW-CBCPW as a simple system of coupled transmission lines. Experimental results are shown to agree very well with the theoretical ones. In particular, the anomalous behavior observed in the transmission characteristic of the through line is related to the resonant phenomenon of the terminated side planes which are short-circuited at both input and output ends due to the test fixture. Finally, a technique of mode suppression in the side-plane regions is suggested for the improvement of signal transmission over a broad band of frequency spectrum. The effects of extra higher order modes on the transmission characteristics at high frequencies are also discussed.
現代俳句
(1993-09-01)
管管