Browsing by Issue Date, starting with "1990-12-15"

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WILSON LOOP AND CONTOUR SHAPES
(1990-12-15)
KAO, WF
;
電子物理學系
;
Department of Electrophysics
By computing the Wilson loop expectation value W[C] in the two-dimensional Schwinger model on R1 x S1, we show that nonleading terms depend on the shape of the contours both on R1 x R1 and R1 x S1. We also find that the rhombic contour and triangular contour lead to the same static potentials both on R1 x R1 and R1 x S1. The binding energy is also affected by the choice of contour shapes on the R1 x S1 model. This indicates that the model on R1 x S1 deserves more study.
LOW-TEMPERATURE REACTION OF THIN-FILM PLATINUM (LESS-THAN-OR-EQUAL-TO-300A) WITH (100) SILICON
(1990-12-15)
TSUI, BY
;
CHEN, MC
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
Thin platinum films of 164 and 303 angstrom thickness are deposited on (100) silicon and annealed at temperatures ranging from 180 to 300-degrees-C in a nitrogen furnace for various times ranging from 1 min to 200 h. Sheet resistance (R(s) measurement shows a four-stage silicide formation sequence: (1) the R(s) increases to a maximum value; (2) the R(s) then decreases to a minimum value; (3) the R(s) increases once again and reaches a second maximum value; and (4) the R(s) decreases to a final stable value. X-ray diffraction analysis indicates that the initial phase grown is Pt12Si5 which corresponds to the sheet-resistance increase in the first stage. This phase is also identified by the transmission electron diffraction analysis. This is the first time that the Pt12Si5 phase formed by the Pt/Si direct reaction is observed. The second stage corresponds to the growth of Pt2Si as confirmed by the x-ray diffraction and Auger spectroscopy analyses. The third stage corresponds to the growth of PtSi and the final stage corresponds to the increase of PtSi grain size. Samples with initial Pt films of 500, 800, and 2000 angstrom thickness were also prepared and analyzed by x-ray diffraction. The increase of film thickness suppresses the growth of Pt12Si5, and for Pt films thicker than 800 angstrom the initial phase grown becomes Pt2Si. The film thickness dependence is explained by the partial lattice-match-induced preferred phase growth effect. The effective absorption coefficient (K(se) of the Pt/Si structure after annealing is determined by ellipsometry measurement, and the activation energy of the Pt12Si5 phase formation derived from the R(s)-time plot or the K(se)-time plot is determined to be 1.5-1.6 eV.
THE MECHANISM OF CHAINS IN PRODUCING ACOUSTIC PLASMONS IN SYSTEMS COMPOSED OF CU-O2 LAYERS AND CU-O CHAINS
(1990-12-24)
TSAY, SF
;
WANG, SY
;
YANG, TJW
;
電子物理學系
;
Department of Electrophysics
Based on the Coulombic electron-electron interactions the dielectric functions, dispersion relations and various plasmons are calculated and analyzed for systems containing a finite number of Cu-O layers and chains. Because of the chain's small polarization the chains could serve as a charge reservoir in stabilizing the acoustic plasmons of the layers and for larger q they could provide isolation between neighboring coupled layers yielding more acoustic plasmons.
美國紐約〔東西門〕景觀雕塑設置案（1973）
(1991)
不詳
楊英風（右）與二女兒楊美惠（左）及友人（中）攝於紐約〔東西門〕前。
A LETTER-ORIENTED PERFECT HASHING SCHEME BASED UPON SPARSE TABLE COMPRESSION
(1991-01-01)
CHANG, CC
;
WU, TC
;
資訊科學與工程研究所
;
Institute of Computer Science and Engineering
In this paper, a new letter-oriented perfect hashing scheme based on Ziegler's row displacement method is presented. A unique n-tuple from a given set of static letter-oriented key words can be extracted by a heuristic algorithm. Then the extracted distinct n-tuples are associated with a 0/1 sparse matrix. Using a sparse matrix compression technique, a perfect hashing function on the key words is then constructed.
戲曲春秋──談周義雄「南管樂舞」系列
(1991)
楊英風
A LINEAR-TIME ALGORITHM TO RECOGNIZE THE DOUBLE EULER TRAIL FOR SERIES-PARALLEL NETWORKS
(1991)
HSU, LH
;
HWANG, JY
;
HO, TY
;
TSAI, CH
;
資訊工程學系
2-FREQUENCY DISPLACEMENT MEASUREMENT INTERFEROMETER BASED ON A DOUBLE-HETERODYNE TECHNIQUE
(1991-01-01)
CHIEN, PY
;
交大名義發表
;
光電工程學系
;
National Chiao Tung University
;
Department of Photonics
A two-frequency laser heterodyne interferometer has been implemented for small displacement measurement. The displacement signal is detected by using a double-heterodyne technique. Vibration amplitudes at 1 kHz on the order of 1 nm and smaller can be detected.
新展舊憶
(1991)
楊英風
ANALYTIC MODELS FOR PERFORMANCE EVALUATION OF SINGLE-BUFFERED BANYAN NETWORKS UNDER NONUNIFORM TRAFFIC
(1991-01-01)
LEE, TH
;
交大名義發表
;
電信工程研究所
;
National Chiao Tung University
;
Institute of Communications Engineering
The performance of single-buffered banyan networks under certain nonuniform traffic patterns had been studied by Garg and Huang. However, the models used are over simplified and the results obtained may deviate from exact values significantly. Alternative models to achieve more accurate performance estimates are presented. In our models, the destinations of blocked packets residing in the buffers of nodes at stage 1 (and perhaps stage 2, depending on the traffic matrix) are memorised. Compared with those adopted by Garg and Huang, our models are only slightly more complicated. By viewing banyan networks as queueing systems, we apply Little's formula to compute the average packet delays.
於理性中尋覓傳統中國的哲思──談孫宇立的雕塑創作
(1991)
楊英風
台北市銀行〔鳳凰來儀〕設置案（1990-1991）
(1991)
不詳
〔鳳凰來儀〕是楊英風在一九七○年大阪萬國博覽會備受各方囑目讚賞的作品，以中國的靈禽瑞鳥－?凰為主題，豎立於國際名建築家貝聿銘設計中國館前，萬博會閉幕後，已故外交家葉公超等人曾計劃將它連同貝聿銘的中國館建築遷回陽明山保存，因經費問題未得到經濟部的支持而作罷。之後北市銀總經理王紹慶鑑於我國金融業已進入國際化，公營銀行也必須以顧客需求為導向，提昇高品質和廣泛的服務，建立前瞻性及國際化的經營理念，於是情商雕塑家楊英風複製〔鳳凰來儀〕，作為市銀企業象徵。
IMAGE REQUANTIZATION BY CARDINALITY DISTRIBUTION
(1991)
HSUEH, YC
;
CHERN, MG
;
CHU, CH
;
交大名義發表
;
資訊工程學系
This article presents a new approach to image requantization, called cardinality distribution. The new method introduces dithering patterns as ordered dither does; however, it provides a smoothing parameter p between 0 and 1. When p is chosen to be near 0.5, the new method can capture very sharp details of images. Therefore, the major deficiency of ordered dither can be avoided. Moreover, the reordering technique and its modified version are used to code bilevel and higher gray-level requantized images, respectively.
美國紐約〔東西門〕景觀雕塑設置案（1973）
(1991)
楊奉琛
圖為楊英風創作之紐約〔東西門〕不銹鋼景觀雕塑。〔東西門〕安置於美國紐約華爾街，東方海外大廈前的廣場上，東方海外大廈是由世界著名的船業鉅子董浩雲先生投資興建；經我國旅美傑出建築師貝聿銘先生規劃設計建築而成。〔東西門〕又稱ＱＥ門，Ｑ表圓，Ｅ表方，ＱＥ是Ｑueen Elizabeth的縮寫，有特別為董浩雲先生的那一艘被焚燬的伊麗莎白皇后號作紀念的意義。
祥龍獻瑞
(1991)
楊英風
本件作品完成於1991年，屬於「飛龍系列」不銹鋼雕塑作品之一，另名〔祥龍獻瑞〕。龍，是中華民族的神髓，萬物力量的本源。飛龍以凝聚當代力量的資訊磁帶為龍身造型，光明雪亮的眼睛象徵太陽，意涵上承傳統、下開先河、堅毅不摧、照耀古今。「當我以龍鳳為創作主題時，是褪去繁華，還其本源，沒有外在的裝飾，也沒有利爪尖喙。龍的眼睛，我常詮釋為太陽，像巨大的火炬般永恆照亮混沌不明的人世；鳳凰的眼睛是月亮，柔美關愛的注視，像慈母撫育稚子的和煦。造型上我省卻諸多牲禽的特徵，用中國藝術中最強而有力的線條，抽象但深刻地表達龍鳳的精神，簡潔剛勁，變化萬千，充滿新生和希望。」（摘自楊英風〈龍鳳涅盤代序〉《龍鳳涅槃──楊英風景觀雕塑資料簡輯》，頁1-2，1991年7月26日，台北）
PROMINENT EFFECT OF ELECTRIC-FIELD TO NONLINEAR-WAVE MIXING PROCESS IN LIQUID-CRYSTALS
(1991)
CHEN, SH
;
KUO, CL
;
光電工程學系
;
Department of Photonics
BLENDS OF POLYCARBONATE AND POLYACETAL
(1991)
CHANG, FC
;
YANG, MY
;
WU, JS
;
交大名義發表
;
應用化學系
Immiscible blends of polycarbonate (PC) and polyacetal (polyoxymethylene, POM) were investigated through rheological measurements, tensile, impact, TEM, SEM, FTi.r. and thermal analysis. The large difference in melt viscosities between these two matrix polymers makes this blending system extremely difficult to process and results in partial thermal degradation of POM. The formation of a strong interpenetrating interface in PC/POM blends significantly raises tensile yield strength, modulus and heat distortion temperature above the average values for the individual polymers. Thermoplastic polyurethane elastomer is not very efficient in toughening PC/POM blends because the elastomer distributes selectively in the PC phase. The rheological morphologies of the blends are interpreted through TEM and SEM photomicrographs.
EXPERT COMPACTOR - A KNOWLEDGE-BASED APPLICATION IN VLSI LAYOUT COMPACTION
(1991-01-01)
HSIAO, PY
;
TSAI, CC
;
資訊工程學系
;
Department of Computer Science
A new application of artificial intelligence techniques in automatic compaction design for a VLSI mask layout is presented. To overcome the shortcomings of iterative search through a large problem space within a working memory, and therefore, to speed up the runtime of compaction, a set of rule-based region query operations and knowledge-based techniques for the plane sweep method are presented in this system. Experimental results have explored the possibility of using expert system technology to automate the compaction process by reasoning about the layout design, applying the sophisticated expert rules to its knowledge base.
GENERATING SUBSETS ON A SYSTOLIC ARRAY
(1991)
LIN, CJ
;
交大名義發表
;
應用數學系
;
National Chiao Tung University
;
Department of Applied Mathematics
PARALLEL PERMUTATION GENERATION ON LINEAR-ARRAY
(1991)
LIN, CJ
;
交大名義發表
;
應用數學系
;
National Chiao Tung University
;
Department of Applied Mathematics