Browsing by Issue Date, starting with "1998"

Now showing 1 - 20 of 83167

Chimney-shaped and plateau-shaped gate electrode field emission arrays
(1998)
Tarntair, FG
;
Wang, CC
;
Hong, WK
;
Huang, HK
;
Cheng, HC
A triode structure of chimney-shaped field emitter arrays is proposed in this article. This triode structure includes the chimney-shaped emitter, thermal oxidation dioxide, and the plateau-shaped singlecrystalline silicon gate electrode. For the application of the matrix-addressable and large area flat panel display, the uniform structure of the emitters and the yield become critical manufacturing issues when attempting to control nano-meter size features. The uniformity and yield of the chimney-shaped emitters are very well controlled. The nano-sized gate-to-emitter separations can be created by the changing thickness of the insulator. The uniformity of the insulator and emitter material can be controlled within 3% which can be obtained by most large area thin film deposition tools, not by photolithography.
負型的古典距離正則圖之研究
(1998)
翁志文
;
WENG CHIH-WEN
;
交通大學應用數學系
The reliability of amorphous silicon thin film transistors for LCD under DC and AC stresses
(1998)
Cheng, HC
;
Huang, CY
;
Lin, JW
;
Kung, JJH
;
電子工程學系及電子研究所
In this paper, hydrogenated amorphous silicon and polycrystalline silicon thin film transistors have been stressed with various conditions including DC and AC. The charge trapping and defect state creation are the two mechanisms to degrade the transfer characteristics of the TFTs. For a-Si.H TFTs, the charge trapping occurs at high silicon content of silicon nitride (SiNx) gate dielectrics or performs at high gate electrical field. Defect stale creation dominates at low hydrogen concentration in a-Si:H. At the performance of AC signal, the degradation of transfer curves is associated with bias, frequency, and duty cycle. The characteristics of a-Si:PI TFTs shift more with increasing bias voltage and duty cycle. For the frequency effect, the transfer characteristics of a-Si:H TFTs decrease with increasing AC frequency under negative AC signal stress, however, they are independent of the frequency under positive AC signal stress.
Analysis of plane-wave scattering by bigratings
(1998)
Peng, ST
;
Hwang, RB
;
電信工程研究所
;
Institute of Communications Engineering
We present here a rigorous analysis of the plane-wave scattering by a class of bigratings, each of which consists of two separated gratings that may have different periods and different orientations. Inherently, this is a three-dimensional boundary value problem, regardless of the incidence condition. An exact formulation based on the method of mode matching is carried out, taking into account the effect of polarization couplings. Numerical results are shown for identifying physical phenomena associated with the class of bigrating structures. In particular, Wood's anomalies in the presence of a bigrating are carefully examined and the results are interpreted in terms of those well known for single gratings.
Mandarin telephone: Speech recognition for automatic telephone number directory service
(1998)
Wang, YR
;
Chen, SH
;
電信工程研究所
;
Institute of Communications Engineering
This paper discusses an HMM-based Mandarin telephone speech recognition method for implementing a prototype system of automatic telephone number directory service. It adopted the GPD/MCE training algorithm to train the HMM models for 100 final-dependent syllable initials and 40 syllable finals. The SBR method was used to compensate the speaker and channel effects. Besides, an RNN-based pre-classification scheme was employed to speed up the recognition search. A syllable recognition rate of 53.7% was achieved. This method was then used to implement an isolated-word recognizer for the prototype system to discriminate 1922 names of bank and insurance companies. Word recognition rates of 94.8% for top-1 and 97.9% for top-3 were achieved.
電腦視覺在虛擬實境中的應用---總計畫(II)
(1998)
陳稔
;
CHEN ZEN
;
交通大學資訊工程系
Dynamic spatial modeling approach for estimation of internal phosphorus load
(1998-01-01)
Kao, JJ
;
Lin, WL
;
Tsai, CH
;
環境工程研究所
;
Institute of Environmental Engineering
The effect of the pollution load generated internally from a reservoir on the effectiveness of an eutrophication control plan is significant and has gained increasing attention recently. Accurate estimation of the internal load is difficult because of its spatial and temporal variation. A procedure using a dynamic spatial modeling approach is proposed to improve the estimation. A case study of Posan off-stream reservoir is described to demonstrate the implementation of the procedure for data collection and model preparation, field sampling planning and investigation, laboratory analysis for phosphorus releasing rates, model integration of AGNPS and WASP, calibration and verification of the integrated model, and the internal load estimation. The procedure is expected to provide appropriate temporal and spatial phosphorus internal load estimation for an off-stream reservoir. (C) 1998 Elsevier Science Ltd. All rights reserved.
專家系統知識自動整合環境之研製
(1998)
曾憲雄
;
TSENG SHIAN-SHYONG
;
交通大學資訊科學系
發展一個成功的專家系統必須要有一個完整、一致且清晰的知識庫，所以，利用不同的知識擷取工具以獲取不同專家們的專業知識並加以整合，就成為建構專家系統的重要課題。然而，在知識的整合過程中，經常會產生知識庫內的規則不完整、不一致或重覆等問題。如何有效地整合不同的專家知識並降低彼此間的矛盾，就成為一個重要的研究方向。傳統的知識整合系統因為需要專家的介入而容易顯現出某些缺點，如：(1) 當知識之間有矛盾出現時，專家們必須介入解決，容易造成(但不一定會)不夠客觀的現象；(2) 整合過程所需時間很長；(3) 當專家愈多時，知識整合越困難、越複雜；這些缺點使得大型專家系統的發展變得非常費時。為了克服這些缺點，在本計畫中，我們提出一個知識自動整合方法。它運用了基因遺傳演算法的自我調整找尋技術，將不同專家所提供的知識或不同機器學習技術所推演得到的規則加以整合，並自動產生一個完整、一致且清晰的知識庫。我們的方法有以下之優點：(1) 只需要少許的整合時間；(2) 當專家所提供的知識愈豐富或機器學習技術所推演得到的規則愈多，知識整合愈有效率，知識庫愈準確；(3) 當知識之間有矛盾出現時，可不需要專家介入；(4) 整合過程中，可不需要專家介入，所以，它是客觀的；(5) 可以擴充至分散式知識整合環境。然而，本系統有一些限制，如:(1) 每一個欲整合之專家知識必須以規則集合形式表示；(2) 當欲整合之專家知識變少，系統必須產生一些仿冒知識(dummy knowledge)，而容易造成知識整合沒有效率；除了上述之優點及限制外，本系統具有很大的擴充性，一些常用的知識擷取工具及機器學習系統很容易整合於本系統中，來幫助系統獲取更多的領域知識。整個知識整合系統將與專家系統建構工具 CLIPS整合，為知識工程師提供完整的發展環境。有了環境的幫助，專家系統的發展將變得比較容易而有效率。本計畫中，我們預計完成一套專家系統的知識自動整合環境，包括 - 知識擷取模組、機器學習模組、知識整合模組以及知識修正模組。知識擷取模組收集了一些知識擷取工具，來幫助專家輸入領域知識。機器學習模組中儲存了一些著名的學習系統，可將過去發生過的案例歸納成一些規則。知識整合模組則負責整合由知識擷取模組所產生的領域知識及由機器學習模組所歸納產生的規則，並產生專家系統的知識庫。知識修正模組則運用於知識庫推理中，若有不適用之規則存在，則將自動找出並加以修正，隨時維持知識庫的一致性及準確性。在應用方面，我們將以醫學上腦瘤診斷及農業上�抻岳|種的實際應用領域進行實作。在應用領域中將邀請專門醫師及學者們作為專家，並依實際病歷及歷年紀錄的資料進行測試，以驗証計畫之成果。
On detection of bounded global predicates
(1998-01-01)
Wu, IC
;
Chen, LB
;
資訊工程學系
;
Department of Computer Science
Distributed programs often follow some bounded global predicates, for example, the total number of certain tokens is always the same or bounded in a range. In order to detect bounded global predicates, we can first derive the minimum and maximum global snapshots and then check if the minimum and maximum are out of the range, Recently, Chase and Garg proposed an efficient method to derive the minimum global snapshot by reducing this problem to a maximum network flow problem. A restriction of this method is that all message values (e.g,, the token number in messages) must be zero and all process state values (e.g,, the token number in processes) must be non-negative. In this paper, we propose an elegant technique, called normalization. By using this technique, we can remove the above restriction and also derive the minimum and maximum global snapshots at the same time.
機械工程之實作學程教學改進研究---總計畫(III)
(1998)
曲新生
;
CHU, HSIN-SEN
;
交通大學機械工程系
Editorial board page for Molecular Crystals and Liquid Crystalso, Volume 312, Number 1o
(1998)
Yoo, Jinn-Chou
;
Shieh, Han-Ping D.
;
光電工程學系
;
Department of Photonics
This is a scanned image of the original Editorial Board page(s) for this issue.
新英文文學－跨越疆界：多元文化的聲音－加勒比海的英語女作家：飄泊離散中的加勒比海女作家（三﹧三）
(1998)
馮品佳
;
FENG PIN-CHIA
;
交通大學外國語文系
行動計算之研究---子計畫五：行動雙階閘道系統之多頻道轉接研究(II)
(1998)
陳榮傑
;
CHEN RONG-JAYE
;
交通大學資訊工程系
Narrow-band interference rejection in OFDM-CDMA transmission system
(1998)
Hsiao, HF
;
Hsieh, MH
;
Wei, CH
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
In this paper, we present a new method called "differential threshold exciser (DTE)" to suppress narrow-band interference in OFDM-CDMA transmission system. Also, another threshold exciser, "over-through threshold exciser (OTTE)", is discussed. The two methods use different transform characteristics of the interference and information signal to suppress the narrow-band interference no matter the interference is stationary or nonstationary. The DTE algorithm has nearly the same performance as the OTTE algorithm with less computation complexity.
Finite element modelling for the impact dynamic response of composite stiffened shells
(1998-01-01)
Goswami, S
;
機械工程學系
;
Department of Mechanical Engineering
Impact dynamic response analysis of composite stiffened shells has been carried out using finite element method. As there is no published literature available on the impact dynamic response of composite stiffened shells, the finite element technique has been applied using a nine noded Lagrangian element for obtaining new results. An improved version of the stiffener modelling has been used in which stiffeners can be placed inside the element. The results of stiffened composite doubly curved shells with different boundary conditions and various laminae orientations have been presented for eccentric stiffeners.
QoS routing in multihop packet radio environment
(1998)
Hsu, YC
;
Tsai, TC
;
Lin, YD
;
資訊工程學系
;
Department of Computer Science
In this paper, we present a method to compute the path bandwidth for the DSDV-based routing algorithm The addressed network does not necessarily have a cellular structure and could have no fired infrastructure. This network can be either stand-alone, or connected to the wired network. Each mobile station has to relay packets for others, thus achieving multihop routing. To calculate the available bandwidth of a path in this environment, it is incorrect to simply compute the minimum bandwidth of the links along the path. There are two crucial steps in the path bandwidth computation process of this multihop environment: (I) intersecting the sets of common free slots of two adjacent links, and (2) dividing the intersection for the adjacent links to share. We present two bandwidth computation rules including the Half rule and the Floating rule. Numerical results are given to evaluate the performance of applying these rules to the DSDV-based QoS routing algorithm.
高效率冷凍系統對變化負載之技術研發---子計畫五：冷凍系統之環控室與測試系統之設計與建立(III)
(1998)
曲新生
;
CHU, HSIN-SEN
;
交通大學機械工程系
Modeling the static and dynamic guard channel schemes for mobile transactions
(1998)
Chen, GC
;
Lee, SY
;
資訊工程學系
;
Department of Computer Science
There are more and more information services provided on the wireless network. Due to long network delay of wireless link, the transaction will be a long-lived transaction. In such situation, the occurrence of handoff is inevitable, and thus wireless link held by the mobile unit crossing the cell boundaries might be forced to terminate. It is undesirable that an active transaction is forced to terminate. In this paper, we propose two guard channel schemes (GCS), static and dynamic, to reduce the probability of forced termination of transactions. In dynamic GCS, the number of reserved channels of a base station is dynamically assigned according to the number of transaction calls which may handoff to this cell while the number of guard channels is fixed in the static GCS. An analytic model based on Markov chain is derived to evaluate the system performance. The correctness of this model is verified by a simulation program. The experimental results show that a significant improvement is achieved by using the dynamic GCS.
事業廢氣生物處理技術整合性研究---子計畫二：以含有固定化氨氣菌及硫化菌之流體化床式生物反應器進行氨氣及硫化氫去除之研究
(1998)
黃志彬
;
Huang Chihpin
;
交通大學環境工程研究所
硫化氫及氨氣是一種臭味強、有毒且無色的氣狀污染物。硫化氫氣體不但會刺激眼睛而且會傷害人體的中樞神經。而對於氨氣的排放加以控制，則能減少其對環境的衝擊並進而保障大眾健康。硫化氫與氨氣常常由畜殖場、石化工業、化學肥料業、皮革工業、焚化爐業、食品工廠、廢水處理廠、及紙漿人纖業所產生。由於業者因處理技術之缺乏或過於昂貴，對於除臭之改善並不積極，因此地方民眾對於業者的改善進度頗有怨言。我國行政院環保署在1992年曾針對國內14種污染行業進行調查，發現硫化氫和氨氣因揮發性大臭味強，因此目前視為優先列管之污染物，特別是硫化氫已明定為優先調查候選中之D級。目前環保署根據硫化氫與氨氣的臭味及毒性，已經訂出了週界排放標準，硫化氫為0.1 ppm而氨氣則為1 ppm。生物處理技術已被證實對氣狀污染物的去除相當有效，特別是對於一些低濃度或生物易分解性的氣狀污染物質，不但去除效率很高而且處理費用相當的便宜。本實驗室將發展一套有效、便宜且實用之除臭系統，特別是針對由皮革業廢水處理場所排放出的廢氣。實驗方法首先是利用不同來源的污泥、土壤、廢水或豬糞以硫化氫、氨氣馴化後，篩選出除臭菌，接著我們將選出適合除臭菌所使用的固定化方法及固定化材質，並探討菌體固定化後之活性。另外本實驗室將設計一套三相式流體化床，將固定化菌體(a) 篩選出具有高去除硫化氫及氨氣能力之菌株，並完成各菌株硝化及硫氧化機制之研究。(b) 找出最佳的固定化材質及固定化方法。(c) 探討流體化床式生物反應器反應條件，包括最適pH、最適溫度、最適填充擔體量、最適液相體積、最適反應槽體積、最適進氣濃度及最佳停留時間。(d) 建立流體化床式生物反應器之最佳化設計及操作準則。(e) 自動化偵測系統之建立及固定化系統反應動力模式之分析與建立。(f) 系統經濟效益之評估。
Shape control of intelligent composite stiffened structures using piezoelectric materials - A finite element approach
(1998-01-01)
Goswami, S
;
Kant, T
;
機械工程學系
;
Department of Mechanical Engineering
A finite element procedure is adopted for the analysis of composite stiffened structures with piezoelectric materials attached to it either at the top or bottom surfaces or inside side the substrate as a composite layer. In the large space structures made of strong and light weight materials, the necessity of using self controlling strategies becomes important day by day for deformation control and suppression of undesired oscillation, specially for the unmanned space vehicles in the outer space. As the importance of stiffened composite configuration in aerospace structures has already been established for their optimum use of materials with high strength to weight ratio, a study of electro-mechanical interaction problem with these structures become necessary. Analysis of composite stiffened plates with piezoelectric sensors/actuators attached to it has been carried out for the first time. Static analysis of intelligent structures, i.e., structures integrated with distributed actuators and sensors, is presented in this work. The distributed sensors and actuator layers, made of piezoelectric materials, are perfectly bonded to the structures. The substrate is a laminated composite stiffened plate made of graphite/epoxy materials. To validate the present procedure, several experimental and analytical examples already solved by the previous researchers, have been compared. Finally, some new results for the stiffened composite plates, hitherto not published, have been included for future research.