Browsing by Issue Date, starting with "2011-08-04"

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HIGH FREQUENCY FLIP CHIP PACKAGE STRUCTURE OF POLYMER SUBSTRATE
(2011-08-04)
Chang Edward-yi
;
Hsu Li-Han
;
Oh Chee-Way
;
Wu Wei-Cheng
;
Wang Chin-te
A high frequency flip chip package substrate of a polymer is a one-layer structure packaged by a high frequency flip chip package process to overcome the shortcomings of a conventional two-layer structure packaged by the high frequency flip chip package process. The conventional structure not only incurs additional insertion loss and return loss in its high frequency characteristic, but also brings out a reliability issue. Thus, the manufacturing process of a ceramic substrate in the conventional structure still has the disadvantages of a poor yield rate and a high cost.
On the performances of forwarding multihop unicast traffic in WBSS-based 802.11(p)/1609 networks
(2011-08-04)
Wang, Shie-Yuan
;
Lin, Chih-Che
;
Hong, Wei-Jyun
;
Liu, Kuang-Che
;
資訊工程學系
The IEEE 802.11(p)/1609 network is a promising candidate for future vehicular communication networks. In this new network, the operation of a new Wave Basic Service set (WBSS) is defined for vehicular environments. Due to the deployment cost consideration, roadside units (RSUs) in such networks are usually installed only at hot spots and intersections, causing the service coverage of RSUs to be discontinuous. To overcome this problem, multihop data forwarding among vehicles can be used to extend the service coverage of RSUs. The multihop geocasting problem has been studied and addressed in our previous work [1], where we proposed a receiver-centric WBSS geocasting scheme to increase multihop geocasting performances in WBSS-based networks. However, multihop unicasting, a more common facility in many network applications and services, was not dealt with in [1]. In this paper, we propose a new Receiver-centric WBSS Forwarding Scheme for Unicast traffic (called RWFS-U), which uses a prioritized receiver-centric WBSS creation design to efficiently support unicast data forwarding in WBSS-based networks. Extensive performance evaluations using both analyses and simulations are presented to understand the effects of the designs of WBSS forwarding schemes on the goodputs of end-to-end flows. Our results show that RWFS-U can significantly outperform the traditional sender-centric schemes on multihop unicasting in WBSS-based networks. (C) 2011 Elsevier B.V. All rights reserved.
Two-state Brownian motor driven by synchronously fluctuating unbiased forces
(2011-08-04)
Rozenbaum, V. M.
;
Makhnovskii, Yu A.
;
Sheu, S. -Y.
;
Yang, D. -Y.
;
Lin, S. H.
As a model of the Brownian motor, we consider a particle moving unidirectionally under the action of two synchronously fluctuating unbiased forces, transverse and longitudinal with respect to the particle track. The former force induces track-normal transitions of the particle between the attached and detached states (with and without a periodic potential, respectively), whereas the latter drives track-parallel motion in either state. Analytical expressions of the current and efficiency are derived for different regimes, with due account of the delayed response of the system to force fluctuations. For a sawtooth potential in the attached state, we reveal several motion regimes affording the maximum current or the maximum efficiency. A special emphasis is placed on the possibility of current reversal. As shown, the interplay between two phase-shifted harmonically varied forces as well as inherent and externally induced asymmetry can lead to the emergence of multiple current reversals, thus enabling the flexible controllability of the motion direction.
Atomic-Scale Field-Effect Transistor as a Thermoelectric Power Generator and Self-Powered Device
(2011-08-04)
Liu, Yu-Shen
;
Yao, Hsuan-Te
;
Chen, Yu-Chang
;
電子物理學系
;
Department of Electrophysics
Using first-principles approaches, we have investigated the thermoelectric properties and energy conversion efficiency of the paired metal-Br-Al junction. Owing to the narrow states in the vicinity of the chemical potential, the nano junction has large Seebeck coefficients such that it can be considered an efficient thermoelectric power generator. We also consider the nanojunction in a three-terminal geometry, where the current, voltage, power, and efficiency can be efficiently modulated by the gate voltages. Such current-voltage characteristics could be useful in the design of nanoscale electronic devices such as a transistor or switch. Notably, the nanojunction as a transistor with a fixed finite temperature difference between electrodes can power itself using the Seebeck effect.
FREQUENCY MULTIPLIER DEVICE AND METHOD THEREOF
(2011-08-04)
Kuo Chien-Nan
;
Yan Tzu-Chao
The present invention provides a method for identifying a specific number of communicating points having relatively smallest accumulated path values from a plurality of transmitting points for a receiving point in a communication system. The method includes steps of: (a) defining a first coordination of each of the plurality of transmitting points and the receiving point on a complex plane; (b) transferring the first coordination of the receiving point to a second coordination thereof, in which the second coordination of the receiving point is near an origin of the complex plane; and (c) identifying the specific number of transmitting points having relatively smallest accumulated path values based on the second coordination of the receiving point.
A stabilization analysis of the introduction of Taiwan 50 Index Futures and Taiwan Top 50 Tracker Fund on the underlying spot market
(2011-08-04)
Chen, Dar-Hsin
;
Lai, Ssu-Min
;
Lin, Li-Chih
;
管理科學系
;
Department of Management Science
The objective of this paper is to examine whether derivatives trading leads to destabilization effects of the underlying markets. We employ Taiwan-listed stocks and partition the sample into Taiwan 50 index constituents and non-Taiwan 50 stocks. The sample period covers from January 2001 to December 2004. Subsequently, we divide the observed period into three sub-periods and use a covariance regression model and the Sharpe measure to analyze the effect of Taiwan 50 Index Futures and Taiwan Top 50 Tracker Fund trading on spot price volatility and performance. The empirical results show that the launches of Taiwan 50 index futures and Taiwan Top 50 Tracker Fund trading not only push the volatility to further increase after controlling several firm-specific factors but also advance the performances. At the same time, Taiwan 50 Index constituents have a higher volatility than non-Taiwan 50 stocks. However, due to the huge trading volume difference, we conjecture that Taiwan Top 50 Tracker Fund is the major factor not the index futures.
A drawdown solution for constant-flux pumping in a confined anticline aquifer
(2011-08-05)
Chen, Yen-Ju
;
Yeh, Hund-Der
;
Kuo, Chia-Chen
;
環境工程研究所
;
Institute of Environmental Engineering
An An anticline, known as a convex-upward fold in layers of rock, commonly is formed during lateral compression, which may be elected as a potential site for carbon sequestration. A mathematical model is developed in this study for describing the steady-state drawdown distribution in an anticline aquifer in response to the constant-flux pumping. The topographical shape of the anticline is mimicked by three successive blocks. The solution is obtained by applying the infinite Fourier transform and the finite Fourier cosine transform in each blocks and acquiring the hydraulic continuities between the blocks. Simulated results reveal that the introduction of a thin-limbs or narrow-ridged anticline would produce a much greater head drop in the ridge zone. For a well of constant pumping rate, the dimensionless drawdown around the well increases with decreasing well screen length or/and aquifer anisotropy ratio. An examination of the effect of well location on the drawdown reveals that the partially penetrating well located at the top-middle of the ridge zone produces the largest drawdown. The simulation of the flow in an anticline aquifer based on MODFLOW results in slightly smaller drawdown values in most regions when compared with those predicted by the present solution. The present solution can also be used to simulate the flow in a slab-shaped aquifer or a hillslope aquifer. It can be applied to determine the aquifer parameters if coupled with an optimization scheme and to provide the basis for selecting a potential site for carbon sequestration in the future as well. (C) 2011 Elsevier B.V. All rights reserved.
Missense Mutation in APOC3 within the C-terminal Lipid Binding Domain of Human ApoC-III Results in Impaired Assembly and Secretion of Triacylglycerol-rich Very Low Density Lipoproteins EVIDENCE THAT ApoC-III PLAYS A MAJOR ROLE IN THE FORMATION OF LIPID PRECURSORS WITHIN THE MICROSOMAL LUMEN
(2011-08-05)
Qin, Wen
;
Sundaram, Meenakshi
;
Wang, Yuwei
;
Zhou, Hu
;
Zhong, Shumei
Hepatic assembly of triacylglycerol (TAG)-rich very low density lipoproteins (VLDL) is achieved through recruitment of bulk TAG (presumably in the form of lipid droplets within the microsomal lumen) into VLDL precursor containing apolipoprotein (apo) B-100. We determined protein/lipid components of lumenal lipid droplets (LLD) in cells expressing recombinant human apoC-III (C3wt) or a mutant form (K58E, C3KE) initially identified in humans that displayed hypotriglyceridemia. Although expression of C3wt markedly stimulated secretion of TAGand apoB-100 as VLDL(1), the K58E mutation (located at the C-terminal lipid binding domain) abolished the effect in transfected McA-RH7777 cells and in apoc3-null mice. Metabolic labeling studies revealed that accumulation of TAG in LLD was decreased (by 50%) in cells expressing C3KE. A Fat Western lipid protein overlay assay showed drastically reduced lipid binding of the mutant protein. Substituting Lys(58) with Arg demonstrated that the positive charge at position 58 is crucial for apoC-III binding to lipid and for promoting TAG secretion. On the other hand, substituting both Lys(58) and Lys(60) with Glu resulted in almost entire elimination of lipid binding and loss of function in promoting TAG secretion. Thus, the lipid binding domain of apoC-III plays a key role in the formation of LLD for hepatic VLDL assembly and secretion.
交大e-News第099期
(2011-08-05)
Secretariat
;
國立交通大學秘書室
Exciplex Electroluminescence Induced by Cross-Linked Hole-Transporting Materials for White Light Polymer Light-Emitting Diodes
(2011-08-09)
Cheng, Yen-Ju
;
Liao, Ming-Hung
;
Shih, Hung-Min
;
Shih, Ping-I
;
Hsu, Chain-Shu
A new class of cross-linkable N,N,N,N'-tetrapheny1-1,1'-biphenyl-4,4'-diame (TPD)-based hole-transporting materials (HTMs), DV-OMe-TPD, DV-Me-TPD, and DV-F-TPD, were designed and synthesized. Two vinyl groups in the TPD units are used for thermal cross-linking, whereas methoxy, methyl and fluoro groups are introduced to modulate the HOMO energy levels of the HTMs. These HTMs are thermally cross-linked to overcome interfacial mixing, realizing solution-processed polyfluorene (PFO)-based devices (ITO/cross-linked HTMs/PFO/CsF/ Al). Besides the characteristic blue emission of PFO, the devices exhibited a red emission whose energy is highly dependent on the HOMO energy of the cross-linked HTM used in the device. This result suggests that the red electroluminescence is derived from the exciplex generated by the adjacent hole and electron at the cross-linked HTM/fluorenone heterojunction interface. By doping small amount of 4,7-bis(9,9-dihexylfluoren-2-yl)-2,1,3-benzothiadiazole (BFBT) into the emissive layer (EML) to compensate green emission, the devices with the configuration of ITO/PEDOT:PSS/DV-Me-TPD/PFO doped with BEBT/CsF/Al exhibited white electroluminescence comprising three primary colors simultaneously. The 0.04 wt % doped device achieved a maximum luminous efficiency of 5.28 cd/A, which represents the highest efficiency for WPLEDs reported so far on the basis of the exciplex strategy. This device showed CIE chromaticity coordinates of (0.82, 0.42) which are close to the ideal white point (0.33, 0.33). We have demonstrated that integrating cross-linked triarylamine-based HTMs with fluorenone defects in PFO to induce exciplex electroluminescence can provide a useful way for realizing WPLED devices.
Tri-frequency duplexer circuit and multi-frequency duplexer circuit
(2011-08-09)
Chen Fu-Chiarng
;
Wang Shi-Yung
The present invention discloses a tri-frequency duplexer circuit and multi-frequency duplexer circuit. The tri-frequency duplexer circuit comprises a microstrip line circuit, two first mushrooms, two second mushrooms and two third mushrooms. The microstrip line circuit comprises a first Input/Output (I/O) port, a second I/O port, a third I/O port and a fourth I/O port. The two first mushrooms are respectively disposed at transmission line paths between the first I/O port and the second I/O port and between the first I/O port and the third I/O port. The two second mushrooms are respectively disposed at transmission line paths between the first I/O port and the second I/O port and between the first I/O port and the fourth I/O port. The two third mushrooms are respectively disposed at transmission line paths between the first I/O port and the third I/O port and between the first I/O port and the fourth I/O port.
Electrogenerated Chemiluminescence of Conjugated Polymer Films from Patterned Electrodes
(2011-08-10)
Guo, Song
;
Fabian, Omar
;
Chang, Ya-Lan
;
Chen, Jiun-Tai
;
Lackowski, William M.
A new phenomenon is presented in which electrogenerated chemiluminescence (ECL) is generated and propagates laterally as self-reinforcing waves as a result of the oxidation of a poly(9,9-dioctylfluorene-co-benzothiadiazole) thin film. In an ordered array of Au electrode posts that act as effective ECL nucleation sites, soliton-like waves were observed to expand from each site and annihilate upon collision with each other. Simulations of the ECL response supported the experimental observations that the ECL waves propagate at a constant speed. A correlated diffusion mechanism involving the correlated motion of ions, injected holes, and solvent molecules is proposed to interpret the experimental data qualitatively. A rapid increase in the diffusion coefficient of these species in the polymer results in a sharp interface between non-oxidized and oxidized polymer phases wherein the electrochemical (EC) oxidation and mass transport of all pertinent species take place. EC oxidation of conjugated polymers of this type has important implications for the understanding of these materials and their modes of operation in EC conjugated polymer devices.
Spin-Hall current and spin polarization in an electrically biased SNS Josephson junction
(2011-08-10)
Mal'shukov, A. G.
;
Chu, C. S.
;
電子物理學系
;
Department of Electrophysics
Periodic in time spin-Hall current and spin polarization induced by a dc electric bias have been calculated in a superconductor-normal two-dimensional electron gas-superconductor (SNS) Josephson junction. We assumed that the band energies of electrons in the normal system are split due to Rashba spin-orbit coupling. The transport parameters have been calculated within the diffusion approximation and by using perturbation expansion over a small SN contact transparency. We found out that, in contrast to the stationary Josephson effect, the spin-Hall current does not turn to zero. Besides a direct proximity effect caused by a Cooper pair's transition into a triplet state, the spin current and polarization are also driven by a periodic electric field associated with the charge imbalance.
光纖光柵感測器
(2011-08-11)
黃安斌
;
高聖傑
一種光纖光柵感測器，其包括：一圓形彈性薄板；及一或二個光纖光柵，設於圓形彈性薄板底面，且其兩端與傳輸訊號的一光纖連接。本發明之光纖光柵感測器的讀數不受溫度變化影響，可應用之產品包括：大面積或大量使用之分佈式應力計、拉力計、壓力計及位移計。
SOLAR POWER MANAGEMENT SYSTEM
(2011-08-11)
WU CHUN-YI
;
HSIEH WEI-CHIH
;
HWANG WEI
A solar power management system is provided for managing electric energy conversion by a photovoltaic cell module, supplying the converted electric energy to an external load, and storing the converted electric energy in a battery. The solar power management system comprises a multiphase maximum power tracking (MPT) module, a charging circuit, and a voltage conversion module. The multiphase MPT module regulates output current of the photovoltaic cell module to output maximum power within the high limit thereof and obtain improved solar energy conversion efficiency. The voltage conversion module converts the electric energy generated by the photovoltaic cell module into different voltage formats, such as 5.6V DC, 1.0V DC, 0.6˜0.3V DC low voltage, or −1.2V DC negative voltage, to meet different external load requirements. The solar power management system has simple circuitry and can be configured as a system on chip (SoC) at reduced cost while provides very wide applications.
Microencapsulated liquid device and method for making the same
(2011-08-11)
Fan Shih-Kang
;
Chiu Cheng-Pu
;
Hsu Ching-Hsiang
A microencapsulated liquid device includes: a substrate; a droplet liquid disposed on the substrate; a protecting layer covering the droplet liquid, the protecting layer being made from an encapsulating liquid that is immiscible with the droplet liquid, that has a surface energy lower than that of the droplet liquid, and that is solidified to form the protecting layer; and a cover plate covering the protecting layer. A method for making the microencapsulated liquid device is also disclosed.
Orientation-Dependent Room-Temperature Ferromagnetism of FeSi Nanowires and Applications in Nonvolatile Memory Devices
(2011-08-11)
Hung, Shih-Wei
;
Wang, Terry Tai-Jui
;
Chu, Li-Wei
;
Chen, Lih-Juann
;
材料科學與工程學系
Self-catalyzed growth of FeSi nanowires has been achieved via a spontaneous chemical reaction method. The room-temperature ferromagnetism behavior compared to that of bulk FeSi at 4 K is attributed to the enhancement of magnetic coupling behavior correlated to different crystalline orientations. The resistivity of the single-stem FeSi nanowire was determined to be 2650 mu Omega.cm. The fabricated memory devices based on FeSi nanowires showed significant C-V hysteresis, exhibiting the memory effect. The strong memory effect can be accounted for by the presence of defects or dangling bonds on the surface of the FeSi nanowires embedded in the SiO(2) layer, which enhances the trapping density for nonvolatile memory applications.
DYNAMIC RECONFIGURABLE HETEROGENEOUS PROCESSOR ARCHITECTURE WITH LOAD BALANCING AND DYNAMIC ALLOCATION METHOD THEREOF
(2011-08-11)
CHUNG Chung-Ping
;
Yang Hui-Chin
;
Chen Yi-Chi
A dynamic reconfigurable heterogeneous processor architecture with load balancing and dynamic allocation method thereof is disclosed. The present invention uses a work control logic unit to detect load imbalance between different types of processors, and employs a number of dynamically reconfigurable heterogeneous processors to offload the heavier loaded processors. Hardware utilization of such design can be enhanced, and variation in computation needs among different computation phases can be better handled. To design the dynamic reconfigurable heterogeneous processors, a method of how to choose the basic building blocks and place the routing components is included. With the present invention, performance can be maximized at a minimal hardware cost. Hence the dynamic reconfigurable heterogeneous processor(s) so constructed and the load balancing and dynamic allocation method together will have the best performance at least cost.
ABDOMINAL BREATHING TRAINING APPARATUS, ABDOMINAL BREATHING TRAINING SYSTEM AND METHOD THEREOF
(2011-08-11)
Hsiao Tzu-Chien
;
Hsu Ru-Shin
;
Hsieh Dai-Ling
An abdominal breathing training apparatus, an abdominal breathing training system and the method thereof are provided. The abdominal breathing training apparatus is adapted for training a trainee how to perform an abdominal breathing and includes a trainer unit, a sensor unit, a data acquisition and conversion unit and a display unit. The trainer unit generates training waveforms and indications. The sensor unit directly measures abdominal movement signals from the trainee, and is positioned adjacent to the abdominal portion of the trainee. The data acquisition and conversion unit is coupled to the sensor unit and generates a trainee abdominal movement waveform according to the measured abdominal movement signals of the trainee. The display unit is coupled to the trainer unit, and displays the training waveforms and the indications to the trainee, who follows the training waveforms on the display unit to perform the abdominal breathing.
Drawn k-in-a-row games
(2011-08-12)
Chiang, Sheng-Hao
;
Wu, I-Chen
;
Lin, Ping-Hung
;
資訊工程學系
;
Department of Computer Science
Wu and Huang (2005) [12] and Wu et al. (2006) [13] presented a generalized family of k-in-a-row games, called Connect(m, n, k, p, q). Two players, Black and White, alternately place p stones on an m x n board in each turn. Black plays first, and places q stones initially. The player who first gets k consecutive stones of his/her own horizontally, vertically, or diagonally wins. Both tie the game when the board is filled up with neither player winning. A Connect(m, n, k, p, q) game is drawn if neither has any winning strategy. Given p, this paper derives the value k(draw)(p), such that Connect(m, n, k, p, q) games are drawn for all k >= k(draw)(p), m >= 1, n >= 1, 0 <= q <= p, as follows. (1) k(draw)(p) = 11. (2) For all p >= 3, k(draw)(p) = 3p + 3d - 1, where d is a logarithmic function of p. So, the ratio k(draw)(P)/P is approximately 3 for sufficiently large p. The first result was derived with the help of a program. To our knowledge, our k(draw)(p) values are currently the smallest for all 2 <= p <= 1000. (C) 2011 Elsevier B.V. All rights reserved.