Browsing by Issue Date, starting with "2014-11-27"

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Linear transceiver design in uplink coordinated multipoint multiple-input multiple-output systems
(2014-11-27)
Lee, Ming-Chun
;
Chung, Wei-Ho
;
Huang, Chung-Jung
;
Chung, Gang-Han
;
Lee, Ta-Sung
The authors investigate linear transceiver design in uplink (UL) coordinated multipoint transmission and reception (CoMP) multiple-input multiple-output (MIMO) systems with joint detections. A two-stage design algorithm is proposed by exploiting the technique of interference alignment, optimising the structure of the effective channel and employing power loading, with the goal to achieve high throughput and convergence performance. In contrast to conventional CoMP transceiver design, which is investigated under a predefined number of data streams transmitted by each user, the authors further investigate the selection of the number of data streams, called the configuration selection, and propose a corresponding low-complexity algorithm. By combining the proposed linear transceiver algorithm and low-complexity configuration selection algorithm, this work presents a new practical framework for linear transceiver design in UL CoMP MIMO systems. The simulation results confirm that the proposed algorithms achieve higher sum-rate performance than prior linear transceivers used in UL CoMP MIMO systems. Furthermore, the proposed transceiver offers comparable performance to existing IA-aided transceivers with significantly faster convergence.
PERIODICALLY RESETTING INTEGRATION ANGLE DEMODULATION DEVICE AND METHOD USING THE SAME
(2014-11-27)
HONG HAO-CHIAO
;
CHEN YUN-TSE
;
HUNG SHAO-FENG
A periodically resetting integration angle demodulation device and a method using the same is disclosed, which uses a waveform multiplier and a periodically resetting integrator to modulate a continuous-time angle modulation signal into a discrete-time signal. The waveform multiplier multiplies the continuous-time angle modulation signal by a square wave signal whose frequency is integer times a carrier frequency, and then transmits the continuous-time angle modulation signal to a periodically resetting integrated circuit. The periodically resetting integrated circuit performs integration during a carrier period to generate a discrete-time angle modulation output signal. The present invention can greatly reduce the difficulty for designing an optical sensing system in the front end without limiting a modulation depth. Besides, the present invention achieves a small volume, high speed, high sensitivity, high reliability, high performance and high condition-adapting properties.
REAL-TIME MULTI-CHANNEL EEG SIGNAL PROCESSOR BASED ON ON-LINE RECURSIVE INDEPENDENT COMPONENT ANALYSIS
(2014-11-27)
FANG Wai-Chi
;
SHIH Wei-Yeh
;
LIAO Jui-Chieh
;
HUANG Kuan-Ju
;
CHEN Chiu-Kuo
A real-time multi-channel EEG signal processor based on an on-line recursive independent component analysis is provided. A whitening unit generates covariance matrix by computing covariance according to a received sampling signal. A covariance matrix generates a whitening matrix by a computation of an inverse square root matrix calculation unit. An ORICA calculation unit computes the sampling signal and the whitening matrix to obtain a post-whitening sampling signal. The post-whitening sampling signal and an unmixing matrix implement an independent component analysis computation to obtain an independent component data. An ORICA training unit implements training of the unmixing matrix according to the independent component data to generate a new unmixing matrix. The ORICA calculation unit may use the new unmixing matrix to implement an independent component analysis computation. Hardware complexity and power consumption can be reduced by sharing registers and arithmetic calculation units.
Enhanced GaN Transistor and the Forming Method Thereof
(2014-11-27)
CHANG Yi
;
LIN Yueh-Chin
;
WANG Huan-Chung
An enhanced GaN transistor is provided. The structure comprises a substrate, a heterostructure, a p-element epitaxy growth layer, a drain ohmic contact and a source ohmic contact disposed on the heterostructure and on two sides of the p-element epitaxy growth layer, a gate structure disposed on the p-element epitaxy growth layer, and is separated from the drain ohmic contact and the source ohmic contact, a surface passivation layer covered the drain ohmic contact, source ohmic contact, and p-element epitaxy growth layer, and covered portion of the gate structure.
The impact of comorbidity on survival after hemorrhagic stroke among dialysis patients: a nationwide population-based study
(2014-11-27)
Lin, Chun-Yu
;
Chien, Chih-Chiang
;
Chen, Hung-An
;
Su, Fu-Mei
;
Wang, Jhi-Joung
Background: This study was aimed at determining the outcome and examining the association between comorbidities and mortality after intracerebral hemorrhage in chronic dialysis patients. Methods: We used the Taiwan National Health Insurance Research Database and enrolled patients who underwent maintenance dialysis between 2000 and 2007. Annual incidence of intracerebral hemorrhage in patients receiving dialysis from 2000 to 2007 was determined. To identify predictors of hemorrhagic stroke, we used logistic regression model to estimate the relative ratio of factors for intracerebral hemorrhage in the most recent cohort (2007). The cumulative survival rate and comorbid conditions associated with mortality after intracerebral hemorrhage among all dialysis patients between 2000 and 2007 was calculated using the Kaplan-Meier method and Cox regression analysis. Results: We identified 57,261 patients on maintenance dialysis in the cohort of 2007, and 340 patients had history of intracerebral hemorrhage among them. Hypertension was the most common comorbidity of dialysis patients. The incidence rate of intracerebral hemorrhage among dialysis patients was about 0.6%. Adjusted logistic regression model showed that male gender, middle age (45-64 years), hypertension, and previous history of stroke were the independent predictors for the occurrence of intracerebral hemorrhage among chronic dialysis patients. 1,939 dialysis patients with development of intracerebral hemorrhage in the analysis period from 2000 to 2007 were identified. In-hospital mortality was high (36.15%) following intracerebral hemorrhage. They were followed up after intracerebral hemorrhage for a mean time of 41.56 months. Adjusted Cox regression analyses demonstrated that the factors independently associated with mortality after intracerebral hemorrhage among dialysis patients included diabetes mellitus, malignancy and a history of prior stroke. Conclusions: Dialysis patients who have history of prior stroke, diabetes and malignancy have worse survival than patients without these comorbidities. Attention must focus on providing optimal medical care after hemorrhagic stroke for these target groups to reduce mortality.
Semi-analytical and approximate solutions for contaminant transport from an injection well in a two-zone confined aquifer system
(2014-11-27)
Hsieh, Ping-Feng
;
Yeh, Hund-Der
;
環境工程研究所
;
Institute of Environmental Engineering
This study develops a mathematical model for contaminant transport due to well injection in a radial two-zone confined aquifer system, which is composed of a wellbore skin zone and a formation zone. The model contains two transient equations describing the contaminant concentration distributions; one is for contaminant transport in the skin zone while the other is for transport in the formation zone. The contaminants are injected into the well with given dispersive and advective fluxes; therefore, the well boundary is treated as a third-type (Robin) condition. The solution of the model derived by the method of Laplace transforms can reduce to a single-zone solution in the absence of the skin zone. In addition, an approximate solution in the time domain is also developed by neglecting dispersion for the case that the contaminants move away from the injection well. Analysis of the semi-analytical solution showed that the influence of the skin zone on the concentration distribution decreases as time elapses. The distribution will be over-estimated near the wellbore if the constant concentration (Dirichlet) condition is adopted at the well boundary. The approximate solution has advantages of easy computing and yield reasonable predictions for Peclet numbers larger than 50, and thus is a practical extension to existing methods for designing aquifer remediation systems or performing risk assessments. (C) 2014 Elsevier B.V. All rights reserved.
Uncertainty in applying the temperature time-series method to the field under heterogeneous flow conditions
(2014-11-27)
Chang, Ching-Min
;
Yeh, Hund-Der
;
環境工程研究所
;
Institute of Environmental Engineering
Due to the irregular distributions of aquifer hydraulic properties, the detail on the characterization of flow field cannot be anticipated. There can be a great degree of uncertainty in the prediction of heat transport processes anticipated in applying the traditional deterministic transport equation to field situations. This article is therefore devoted to quantification of uncertainty involving predictions over larger scales in terms of the temperature variance. A stochastic frame of reference is adopted to account for the spatial variability in hydraulic conductivity and specific discharge. Within this framework, the use of the first-order perturbation approximation and spectral representation leads to stochastic differential equations governing the mean behavior and perturbation of the temperature field in heterogeneous aquifers. It turns out that the mean equation developed in this sense is equivalent to the traditional deterministic transport equation and the temperature variance gives a measure of the prediction uncertainty from the traditional transport equation. The closed-form expression for the temperature variance developed here indicates that the controlling parameters such as the correlation scale of specific discharge, which measures the spatial persistence of the flow field, and the periodicity of the source term tend to increase the variability in temperature field in heterogeneous aquifers. The uncertainty of the traditional heat transport model increases as the penetration depth of thermal front through the aquifer increases. This suggests that prediction of temperature distribution using the traditional heat transport model in heterogeneous aquifers is expected to be subject to large uncertainty at a large depth (in the downstream region). For the management purpose, the variance of temperature could serve as a calibration target when applying the traditional model to field situations. It may be more reasonable to make conclusions from, say, the mean temperature with one or two standard deviations rather than only the mean temperature drawn from the traditional heat transport equation. (C) 2014 Elsevier B.V. All rights reserved.
TWO-WAY RELAY TRANSMISSION METHOD AND APPARATUS APPLIED TO MULTI-INPUT MULTI-OUTPUT COMMUNICATION SYSTEMS
(2014-11-27)
LIN David W.
;
CHUNG I-Chou A.
A two-way relay transmission apparatus applied to multi-input multi-output communication systems that combines signals received from the terminals and performs a modulo operation to the combined signal to concentrate the signal points towards the center of the constellation. And then, the modulo version of the combined signal is broadcasted. As a result, the peak and average relay transmission powers can be reduced.
FLASH MEMORY
(2014-11-27)
Chin Albert
;
Tsai Chun-Yang
A MONOS Charge-Trapping flash (CTF), with record thinnest 3.6 nm ENT trapping layer, has a large 3.1 V 10-year extrapolated retention window at 125° C. and excellent 106 endurance at a fast 100 μs and ±16 V program/erase. This is achieved using As+-implanted higher κ trapping layer with deep 5.1 eV work-function of As. In contrast, the un-implanted device only has a small 10-year retention window of 1.9 V at 125° C. A MoN—[SiO2—LaAlO3]—[Ge—HfON]—[LaAlO3—SiO2]—Si CTF device is also provided with record-thinnest 2.5-nm Equivalent-Si3N4-Thickness (ENT) trapping layer, large 4.4 V initial memory window, 3.2 V 10-year extrapolated retention window at 125° C., and 3.6 V endurance window at 106 cycles, under very fast 100 μs and low ±16 V program/erase. These were achieved using Ge reaction with HfON trapping layer for better charge-trapping and retention.
Coupled nanowire-based hybrid plasmonic nanocavities on thin substrates
(2014-11-28)
Cheng, Pi-Ju
;
Chiang, Chih-Kai
;
Chung, Yi-Cheng
;
Tien, Chung-Hao
;
Lin, Tzy-Rong
We theoretically analyze nanowire-based hybrid plasmonic nanocavities on thin substrates at visible wavelengths. In the presence of thin suspended substrates, the hybrid plasmonic modes, formed by the coupling between a metal nanowire and a dielectric nanowire with optical gain, exhibit negligible substrate-mediated characteristics and overlap better with the gain region. Consequently, the confinement factor of the guided hybrid modes is enhanced by more than 42%. However, the presence of significant mirror loss remains the main challenge to lasing. By adding silver coatings with a sufficient thickness range on the two end facets, we show that the reflectivity is substantially enhanced to above 50%. For a coating thickness of 50 nm and cavity length of about 4 mu m, the quality factor is above 100.
多數服從少數　評鑑無效？
(2014-11-30)
鄭宇茹
;
Department of Communication and Technology
;
傳播與科技學系
交通大學餐廳評鑑尚有許多爭議，但最重要的還是需要學生多加參與公眾事務。
無聲世界　以文字言語
(2014-11-30)
簡品心
;
Department of Communication and Technology
;
傳播與科技學系
這是一個奇怪的世界。這個地方沒有聲音，沒有溫度，盛產千奇百怪的符號，居民的巢穴都淹滿了文字。
化平凡為神奇　紙板藝術家
(2014-11-30)
吳建勳
;
Department of Communication and Technology
;
傳播與科技學系
利用平凡的廢紙板，創造出許多驚豔作品的年輕藝術家鍾凱翔，名聲更是享譽國內外。
波麗士老爸的闖蕩日誌
(2014-11-30)
陳珮容
;
Department of Communication and Technology
;
傳播與科技學系
我家也有個波麗士老爸，他的闖蕩故事，沒有上演英雄情節，卻多了份平凡樸實。
蝴蝶破繭　輪椅上翩翩起舞
(2014-11-30)
王彥琪
;
Department of Communication and Technology
;
傳播與科技學系
輪椅國標舞舞者楊春蘭，自小罹患小兒麻痺，非常自卑。但藉著輪椅國標舞，重拾自信，並榮登國際舞臺。
收費員爭權益　絕食抗選舉
(2014-11-30)
許鴻財
;
張凱翔
;
Department of Communication and Technology
;
傳播與科技學系
在選舉的前一天，國道收費員自救會的收費員們爬到國道eTag門架上絕食抗議。
心靈之眼　布列松
(2014-11-30)
沈祖廷
;
Department of Communication and Technology
;
傳播與科技學系
心靈之眼　決定性瞬間　布列松談攝影的書評
猜測天空心意　發現樂趣　
(2014-11-30)
包金
;
Department of Communication and Technology
;
傳播與科技學系
李湘源，有相當資深的預報氣象經歷，工作壓力雖大，卻也引發了興趣，因著上帝改變心意，更願意服務人群。
動靜皆宜　調酒大賽
(2014-11-30)
張婷芳
;
Department of Communication and Technology
;
傳播與科技學系
金爵獎調酒大賽於高雄市岡山文化中心盛大舉行，來自全國各路調酒好手齊聚一堂。
總編輯的話
(2014-11-30)
林霈楨
;
Department of Communication and Technology
;
傳播與科技學系
本期共計二十三篇，採訪的人物相當豐富，頭題〈回歸山城　再創木造回憶〉即是報導一位繼承家族木頭工廠的第二代，用嶄新的設計理念改變老舊工廠的命運。