Browsing by Issue Date, starting with "2011-11-01"

Now showing 1 - 20 of 40009

A 124 Mpixels/s VLSI Design for Histogram-Based Joint Bilateral Filtering
(2011-11-01)
Tseng, Yu-Cheng
;
Hsu, Po-Hsiung
;
Chang, Tian-Sheuan
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
This paper presents an efficient and scalable design for histogram-based bilateral filtering (BF) and joint BF (JBF) by memory reduction methods and architecture design techniques to solve the problems of high memory cost, high computational complexity, high bandwidth, and large range table. The presented memory reduction methods exploit the progressive computing characteristics to reduce the memory cost to 0.003%-0.020%, as compared with the original approach. Furthermore, the architecture design techniques adopt range domain parallelism and take advantage of the computing order and the numerical properties to solve the complexity, bandwidth, and range-table problems. The example design with a 90-nm complementary metal-oxide-semiconductor process can deliver the throughput to 124 Mpixels/s with 356-K gate counts and 23-KB on-chip memory.
Controlling Hyperchaos and Chaotic Projective Hybrid Synchronization with Time Delay in a Three Positive Lyapunov Exponents of New Four Dimensions Chen System by Adaptive Control
(2011-11-01)
Yang, Cheng-Hsiung
;
Ge, Zheng-Ming
;
機械工程學系
;
Department of Mechanical Engineering
This paper examined chaos and control of hyperchaos for the three positive Lyapunov exponents of the new four dimensions Chen system. By applying numerical results, phase portrait, Lyapunov exponent and power spectrum were manifested and chaotic, hyperchaotic and three positive Lyapunov exponents of chaotic motions were thereby observed. Finally, adaptive control algorithm was used to effectively control chaos and chaos synchronization.
Water storage loss in central and south Asia from GRACE satellite gravity: correlations with climate data
(2011-11-01)
Tangdamrongsub, Natthachet
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Hwang, Cheinway
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Kao, Yu-Chi
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土木工程學系
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Department of Civil Engineering
Recent decrease of water supply in central Asia and south Asia affects billions of people here. By filtering the errors at higher frequency components and correcting for the contaminated components, we enhance the monthly GRACE gravity fields to improve the determination of change in equivalent water height (EWH). The water storage changes from GRACE and the GLDAS hydrology model all show decreasing trends in this region. At the annual and inter-annual time scales, significant correlations between the variations in EWH and the variations in temperature, precipitation and snow equivalent height are found, especially at high altitude stations, suggesting that climate change is the driving factor for the water depletion in central Asia and south Asia.
An exact conformal symmetry Ansatz on Kaluza-Klein reduced TMG
(2011-11-01)
Moutsopoulos, George
;
Ritter, Patricia
;
電子物理學系
;
Department of Electrophysics
Using a Kaluza-Klein dimensional reduction, and further imposing a conformal Killing symmetry on the reduced metric generated by the dilaton, we show an Ansatz that yields many of the known stationary axisymmetric solutions to TMG.
An organic hydrogel film with micron-sized pillar array for real-time and indicator-free detection of Zn(2+)
(2011-11-01)
Chao, Yu-Chiang
;
Huang, Yi-Sa
;
Wang, Hsin-Ping
;
Fu, Ssu-Ming
;
Huang, Chien-Hao
A hydrogel sensing film for a real-time and indicator-free detection of Zn(2+) is developed by embedding a fluorescent indicator 11,16-bis( phenyl)-6,6,21,21-tetramethyl-m-benzi-6,21-porphodimethene in a hydrogel host poly(2-hydroxyethyl methacrylate). The sensing film shows high stability and selectivity to Zn(2+). The sensitivity of the sensing film is increased by fabricating a micron-sized pillar array on the surface of the sensing film to increase the surface area. For Zn(2+) concentrations of 10 (4) and 10 (3) M, the response time is 30 and 3 s, respectively. (C) 2011 Elsevier B.V. All rights reserved.
日常生活與跌倒動作辨識裝置
(2011-11-01)
楊秉祥
;
王致中
;
廖顯庭
本發明提供一種日常生活與跌倒動作辨識裝置。首先透過一肌電訊號感測單元及/或一慣性感測單元，取得人體動作與肌肉運作狀況，可記錄日常生活的動作，並從日常生活動作中辨識出跌倒動作，以即時啟動防護裝置防止或減少傷害。此外，透過一設定單元，配合不同的使用者，去針對不同的使用狀況預先設定，以提高準確度。最後，利用該肌電訊號感測單元及/或該慣性感測單元，取得受控使用者的移動距離，即可取得受控使用者在室內空間的定位。
Stress tuning of strong and weak couplings between quantum dots and cavity modes in microdisk microcavities
(2011-11-01)
Lin, Hsuan
;
Lin, Chia-Hsien
;
Lai, Wei-Chen
;
Lee, Yi-Shan
;
Lin, Sheng-Di
We present the control of couplings between quantum dots and cavity modes in microdisk microcavities by a stress tuning scheme. The excitonic transitions and cavity modes can be brought into resonance due to their different energy shift rates with the applied strain. Spectral signatures of both strong and weak couplings are clearly observed. The strain tunable device can be used to tune the exciton wavelength bidirectionally at constant temperatures without significantly affecting the emission rate and linewidth of excitons.
Characteristics of flow distribution in compact parallel flow heat exchangers, part I: Typical inlet header
(2011-11-01)
Wang, Chi-Chuan
;
Yang, Kai-Shing
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Tsai, Jhong-Syuan
;
Chen, Ing Youn
;
機械工程學系
This study experimentally and numerically investigates the single-phase flow into parallel flow heat exchangers with inlet and outlet rectangular headers having square cross section and 9 circular tubes. The effects of inlet flow condition, tube diameter, header size, area ratio, flow directions (Z and U-type), as well as the gravity are investigated. The experimental results indicate that flow distribution for U-type flow is more uniform than Z-type flow. Depending on the inlet volumetric flow rate, the flow ratio at the first several tubes can be lower than 50% of the last tube for Z-type arrangement, and this phenomenon becomes more and more pronounced with the rising velocity at the intake conduit. The mal-distribution can be eased via reducing the branching tube size or increasing the entrance settling distance at the intake conduit. It is found that the influence of gravity on mal-distribution is negligible and the mal-distribution is associated with the jet flow pattern. (C) 2011 Elsevier Ltd. All rights reserved.
Apparatus and method for executing the handoff process in wireless networks
(2011-11-01)
Lin Yi-Bing
;
Hsu Shih-Feng
Disclosed is an apparatus and method for executing the handoff process in the wireless networks. The apparatus comprises a processor to execute an identity checking mechanism. When a wireless network station wants to move from a source AP to a destination AP, the wireless network station sends an authentication request message to the destination AP. The identity checking mechanism searches a R0KH table of the destination AP for the R0KH ID contained in the authentication request message, and determines a setting parameter for executing a handoff process. Thereby, the wireless network station may execute the handoff process. A R0KH table of an AP consists of all IDs of R0KHs that can be accessed by the AP.
Magnolol-Loaded Core-Shell Hydrogel Nanoparticles: Drug Release, Intracellular Uptake, and Controlled Cytotoxicity for the Inhibition of Migration of Vascular Smooth Muscle Cells
(2011-11-01)
Wang, Yen-Jen
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Chien, Yin-Chih
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Wu, Chieh-Hsi
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Liu, Dean-Mo
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材料科學與工程學系
Encapsulation and release behavior of a water-insoluble drug, magnolol, using a core shell polysaccharide-based nanoparticle, manipulating the cellular internalization and controlled cytotoidc effect of magnolol-loaded nanoparticles over the A10 vascular smooth muscle cells (VSMCs) was reported. A magnolol-polyvinylpyrrolidone (PVP) core phase was prepared, followed encapsulating by an amphiphilic carboxymethyl-hexanoyi chitosan (CHC) shell to form a magnolol-loaded core-shell hydrogel nanoparticles (termed magnolol-CHC nanoparticles). The resulting magnolol-CHC nanopartides were employed for evaluation of drug release and controlled cytotoxic inhibition of VSMCs migration in vitro. A sustained release of the magnolol from the nanoparticles was determined. The magnolol-CHC nanoparticles exhibited outstanding cellular uptake efficiency, and under a cytotoxic evaluation, an increased antiproliferative effect and effective inhibition of VSMC migration as a result of efficient intracellular delivery of the encapsulated magnolol in comparison to free magnolol was achieved. We then envision a potential intracellular medication strategy with improved biological and therapeutic efficacy using the magnolol-CHC nanoparticles illustrated in this work.
Linking Socioeconomic Status to Social Cognitive Career Theory Factors: A Partial Least Squares Path Modeling Analysis
(2011-11-01)
Huang, Jie-Tsuen
;
Hsieh, Hui-Hsien
;
管理科學系
;
Department of Management Science
The purpose of this study was to investigate the contributions of socioeconomic status (SES) in predicting social cognitive career theory (SCCT) factors. Data were collected from 738 college students in Taiwan. The results of the partial least squares (PLS) analyses indicated that SES significantly predicted career decision self-efficacy (CDSE); however, the relationship between SES and career decision-making outcome expectations (CDMOE) was not significant. In addition, the findings revealed that CDSE had a direct effect as well as an indirect effect, via CDMOE, on career exploratory intentions. Implications for counseling and future research are discussed.
Determining a common set of weights in a DEA problem using a separation vector
(2011-11-01)
Chiang, C. I.
;
Hwang, M. J.
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Liu, Y. H.
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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
A separation method to be used for locating a set of weights, also known as a common set of weights (CSW), in the Data Envelopment Analysis (DEA) is proposed in this work. To analyze the methods of finding the CSW, it is necessary to solve a particular form of a multiple objectives fractional linear programming problem (MOFP). One of the characteristics of this particular MOFP is that the decision variables can be separated into two parts; one part of variables present in the numerator and the other part of variables present in the denominator. Based on this characteristic, this research utilized an auxiliary vector to convert the MOFP to a single objective linear programming to obtain a CSW for calculating the DMU's efficiency ratio. Finally, the developed method is applied to analyze the data of the last Beijing Olympic Games. (C) 2011 Elsevier Ltd. All rights reserved.
動態可重組化的材質過濾系統
(2011-11-01)
汪威定
;
楊惠親
;
徐日明
;
鍾崇斌
本發明係揭露一種材質過濾系統，其包含一順序產生器、一擷取單元及一分派單元。順序產生器於每一工作週期內產生一執行順序，執行順序是從多個佇列中分別擷取多個像素的優先順序，擷取單元於一工作週期內根據泛用型材質過濾器的總數量限制及上述的優先順序輸出多個布林訊號，以決定從哪些佇列中擷取像素以進行材質過濾處理，分派單元再將待處理的像素之多個材質過濾格式以及這些像素的非均值比例分派到多個位址產生器。此外，本發明利用蠻力法使多個雙線性材質過濾器滿足像素的各種材質過濾格式。藉此，本發明可在不更動位址產生器及材質快取記憶體之規格的前提下，大幅減少材質過濾器在3D繪圖處理器中所占的空間。
Leucine pools in Escherichia coli biofilm discovered by Raman imaging
(2011-11-01)
Venkata, Hemanth Nag Noothalapati
;
Nomura, Nobuhiko
;
Shigeto, Shinsuke
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應用化學系
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應用化學系分子科學碩博班
In structured communities of bacteria known as biofilms, a variety of biomolecules have been shown to play a unique role as signals and/or regulators in biofilm formation. Here, we report that high levels of the amino acid leucine ( leucine pool) were detected, for the first time, within microcolonies in a 30-h-old Escherichia coli biofilm by Raman imaging. Localization of leucine revealed by multifrequency Raman images indicates leucine accumulation during the early stage of the E. coli biofilm formation, which may have resulted from physiological environment-specific metabolic adaptation. We demonstrate that our label-free Raman imaging method provides a useful platform for directly identifying still unknown natural products produced in biofilms as well as for visualizing heterogeneous distributions of biofilm constituents in situ. Copyright (C) 2011 John Wiley & Sons, Ltd.
A Sub-mW All-Digital Signal Component Separator With Branch Mismatch Compensation for OFDM LINC Transmitters
(2011-11-01)
Chen, Tsan-Wen
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Tsai, Ping-Yuan
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Yu, Jui-Yuan
;
Lee, Chen-Yi
;
電機工程學系
Linear amplification with nonlinear components (LINC) is an attractive technique for achieving linear amplification with high efficiency. This paper presents a sub-mW all-digital signal component separator (SCS) design for OFDM LINC transmitters, including a phase calculator and a digital-control phase shifter (DCPS) pair. In addition, a digital mismatch compensation scheme is proposed and integrated into the SCS to reduce the design complexity of the power amplifier. This chip is manufactured in a 90 nm standard CMOS process with an active area of 0.06 mm(2). The DCPS can generate phase-modulated signals at 100 MHz with 8-bit resolution and RMS error 9.33 ps (0.34 degrees). The phase calculation can be performed at a maximum speed of 50 MHz using a 0.5 V supply voltage, resulting in a 73.88% power reduction. Comparing to state-of-the-art, the power consumption of the overall SCS is only 949.5 mu W which minimizes the power overhead for an LINC transmitter. This SCS with the branch mismatch compensation provides a 0.02 dB gain and 0.15 degrees phase fine-tune resolution without adding additional front-end circuits. Considering 1 dB gain and 10 degrees phase mismatch, the system EVM of -29.81 dB and ACPR of -34.56 dB can still be achieved for 5 MHz bandwidth 64-QAM OFDM signals.
微機電陀螺儀
(2011-11-01)
陳宗麟
;
紀建宇
;
李嘉緯
本發明係關於一種無需執行離線校正程序，便可線上補償其感測電路瑕疵及機械結構瑕疵所造成的誤差，且無需積分程序便能運算出其所依附之待測物之旋轉角度的微機電陀螺儀。其包括：一陀螺儀本體模組、一與陀螺儀本體模組耦合的感測模組以及一分別與陀螺儀本體模組及感測模組耦合的控制模組。其中，控制模組係接受感測模組所感測出之陀螺儀本體模組的系統動態，再應用一陀螺儀控制方法控制陀螺儀本體模組並運算出其所依附之待測物的旋轉角度。此外，控制模組輸出至陀螺儀本體模組的一控制訊號係包括兩個外加頻率訊號，以驅動陀螺儀本體模組。
Two-Level FIFO Buffer Design for Routers in On-Chip Interconnection Networks
(2011-11-01)
Huang, Po-Tsang
;
Hwang, Wei
;
交大名義發表
;
National Chiao Tung University
The on-chip interconnection network (OCIN) is an integrated solution for system-on-chip (SoC) designs. The buffer architecture and size, however, dominate the performance of OCINs and affect the design of routers. This work analyzes different buffer architectures and uses a data-link two-level FIFO (first-in first-out) buffer architecture to implement high-performance routers. The concepts of shared buffers and multiple accesses for buffers are developed using the two-level FIFO buffer architecture. The proposed two-level FIFO buffer architecture increases the utilities of the storage elements via the centralized buffer organization and reduces the area and power consumption of routers to achieve the same performance achieved by other buffer architectures. Depending on a cycle-accurate simulator, the proposed data-link two-level FIFO buffer can realize performance similar to that of the conventional virtual channels, while using 25% of the buffers. Consequently, the two-level FIFO buffer can achieve about 22% power reduction compared with the similar performance of the conventional virtual channels using UMC 65 nm CMOS technology.
High-power Q-switched laser with high-order Laguerre-Gaussian modes: application for extra-cavity harmonic generations
(2011-11-01)
Huang, Y. J.
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Chiang, P. Y.
;
Liang, H. C.
;
Su, K. W.
;
Chen, Y. F.
We present a compact efficient scheme for generation of high-order Laguerre-Gaussian TEM (p,0) modes in a diode-pumped actively Q-switched Nd:YVO(4) laser. The resonator is composed of two plane mirrors with an intracavity concave lens to expand the cavity mode size for generating a high-power Laguerre-Gaussian TEM(5,0) mode. We further confirm that the TEM(5,0) mode is noticeably superior to the TEM(0,0) mode in the processes of second and third harmonic generations.
Saturated flow boiling heat transfer of R-410A and associated bubble characteristics in a narrow annular duct
(2011-11-01)
Chen, C. A.
;
Li, K. W.
;
Lie, Y. M.
;
Lin, T. F.
;
機械工程學系
Experiments are conducted here to investigate how the channel size affects the R-410A saturated flow boiling heat transfer and associated bubble characteristics in a horizontal narrow annular duct. The gap of the duct is fixed at 1.0 and 2.0 mm in this study. The measured data indicate that the saturated flow boiling heat transfer coefficient increases with increasing refrigerant mass flux and saturated temperature and with a decrease in the gap size. Besides, raising the imposed heat flux can cause a significant increase in the boiling heat transfer coefficient. The results from the flow visualization show that the mean diameter of the bubbles departing from the heating surface decreases slightly with increasing refrigerant mass flux and saturated temperature. Moreover, the bubble departure frequency increases at reducing duct size and increasing mass flux. And at a high imposed heat flux many bubbles generated from the cavities in the heating surface tend to merge together to form big bubbles. Meanwhile, comparisons of the present heat transfer data for R-410A with R-407C and R-134a in the same duct and with some existing correlations are conducted. Furthermore, an empirical correlation for the present R-410A saturated flow boiling heat transfer data is proposed. (C) 2011 Elsevier Ltd. All rights reserved.
Carotid atherosclerosis and cognitive function in midlife: The beaver dam offspring study
(2011-11-01)
Zhong, Wenjun
;
Cruickshanks, Karen J.
;
Huang, Guan-Hua
;
Klein, Barbara E. K.
;
Klein, Ronald
Background: Atherosclerosis may be associated with cognitive function; however the studies are few, especially among midlife adults. Methods: Participants in the beaver dam offspring study who had cognitive test data and gradable carotid artery ultrasound scans were included (n = 2794, mean age: 49 years). Atherosclerosis was measured by carotid intima-media thickness (IMT) and the presence of plaque. Cognitive function was measured by the trail making test (TMT), grooved pegboard test (GPT) and mini-mental state examination (MMSE). Generalized cognitive function was defined by a summary score calculated from the TMT and GPT. Linear regression was used to evaluate the associations between carotid atherosclerosis and cognitive function tests. Results: Larger IMT was associated with lower GPT, MMSE and the summary score adjusting for multiple factors, the coefficients were: 13.8s (p < 0.0001), -0.6 (p = 0.007), and 0.47 (p = 0.01), respectively for 1 mm increase in IMT. Plaque scores were significantly associated with TMT-B, GPT, MMSE, and the summary score adjusting for age, sex and education. The associations remained statistically significant after further adjustments except for the association with TMT-B, which was attenuated and no longer significant. Conclusions: Our results show the significant associations between markers of carotid atherosclerosis and cognitive function in a cohort of persons aged 21-84 years. Longitudinal studies are needed to further examine these associations. (C) 2011 Elsevier Ireland Ltd. All rights reserved.