Browsing by Issue Date, starting with "2011-11-08"

Now showing 1 - 20 of 39888

Object image detection method
(2011-11-08)
Han Chin-Chuan
;
Chen Ying-Nong
The present invention discloses an object image detection method, which uses a coarse-to-fine strategy to detect objects. The method of the present invention comprises steps: acquiring an image and pre-processing the image to achieve dimensional reduction and information fusion; using a trained filter to screen features; and sequentially using a coarse-level MLP verifier and a fine-level MLP verifier to perform a neural network image detection to determine whether the features of the image match the features of the image of a target object. The present invention simultaneously uses three mainstream image detection methods, including the statistic method, neural network method and adaboost method, to perform image detection. Therefore, the present invention has the advantages of the rapidity of the adaboost method and the accuracy of the neural network method at the same time.
Wavelength-multiplex and space-multiplex holographic storage device
(2011-11-08)
Su Wei-Chia
;
Chen Yeh-Hung
;
Chung Te-Yuan
The present invention discloses a wavelength-multiplex and space-multiplex holographic storage device, which comprises a storage medium, a plurality of signal light beams and at least one reference light beam. The signal light beams have different wavelengths and illuminate the storage medium. The reference light beam illuminates the storage medium and interferes with the signal light beams to form a plurality of interference patterns. The interference patterns are respectively stored on different-depth storage layers of the storage medium. The present invention not only has a high access rate but also has a large storage capacity.
Donor-Acceptor Random Copolymers Based on a Ladder-Type Nonacyclic Unit: Synthesis, Characterization, and Photovoltaic Applications
(2011-11-08)
Chen, Chiu-Hsiang
;
Cheng, Yen-Ju
;
Chang, Chih-Yu
;
Hsu, Chain-Shu
;
應用化學系
We have developed a ladder-type multifused thienyl-phenylene-thienylene-phenylene-thienyl (TPTPT) unit where each thiophene ring is covalently fastened with the adjacent benzene rings by a carbon bridge, forming four cyclopentadiene rings embedded in a nonacyclic structure. This rigid and coplanar TPTPT building block was copolymerized with electron-deficient acceptors, dibromobenzothiadiazole (BT) or dibromodithienyldiketopyrrolopyrrole (DPP), via Stille polymerization. By varying the feed ratio of the monomers, a new series of random copolymers PTPTPTBT11, PTPTPTBT12, PTPTPTDPP11, PTPTPTDPP12, and PTPTPTDPP13 with tunable optical and electronic properties were prepared. The PTPTPTDPP12/PC(71)BM (1:4, w/w) based device exhibited the highest short circuit current (J(sc)) of 10.78 mA/cm(2) with a good power conversion efficiency (PCE) of 4.3% due to the much boarder absorption ability and the highest hole mobility of PTPTPTDPP12. The devices based on PTPTPTDPP13, PTPTPTDPP11, PTPTPTBT12, and PTPTPTBT11 polymers also displayed promising efficiencies of 4.1%, 3.6%, 3.1%, and 2.8%, respectively. Most importantly, PTPTPTDPP12 has been demonstrated as a superior low-band-gap material for polymer solar cell with inverted architecture, achieving a high PCE of 5.1%.
Method for parameter identification and parameter optimization of microspeakers
(2011-11-08)
Bai Mingsian R.
;
Chen Rong Liang
The present invention discloses a method for parameter identification and parameter optimization of microspeakers. Measurement procedures for identifying electromechanical constants of microspeaker and a GUI are developed to facilitate estimation of electroacoustic parameters of the microspeaker under test. In light of the thus identified microspeaker parameters, a parameter optimization procedure is carried out to obtain the design that attains the best acoustic performance with minimum harmonic distortion.
Object-based image search system and method
(2011-11-08)
Fu Hsin Chia
;
Xu Yeong Yuh
The present invention discloses an object-based image search system and method, whereby a user may visually specify query objects for retrieving relevant images without using any image-segmenting software tool. The method of the present invention comprises: specifying target feature points from sample images which are displayed in an image query interface and determining logic relationships of the target feature points; utilizing a feature-point checking program to correlate the target feature points with target objects; utilizing a feature-similarity calculating program to find out the images relevant to the target objects via the image feature parameters stored in a feature database; arranging and presenting the relevant images in sequence.
Axial couplings in heavy-hadron chiral perturbation theory at the next-to-leading order
(2011-11-09)
Detmold, William
;
Lin, C. -J. David
;
Meinel, Stefan
;
物理研究所
;
Institute of Physics
We present calculations of axial-current matrix elements between various heavy-meson and heavy-baryon states to the next-to-leading order in heavy-hadron chiral perturbation theory in the p-regime. When compared with data from lattice computations or experiments, these results can be used to determine the axial couplings in the chiral Lagrangian. Our calculation is performed in partially quenched chiral perturbation theory for both SU(4 vertical bar 2) and SU(6 vertical bar 3). We incorporate finite-size effects arising from a single Goldstone meson wrapping around the spatial volume. Results for full QCD with two and three flavors can be obtained straightforwardly by taking the sea-quark masses to be equal to the valence-quark masses. To illustrate the impact of our chiral perturbation theory calculation on lattice computations, we analyze the SU(2) full-QCD results in detail. We also study one-loop contributions relevant to the heavy-hadron strong-decay amplitudes involving final-state Goldstone bosons, and demonstrate that the quark-mass dependence of these amplitudes can be significantly different from that of the axial-current matrix elements containing only single-hadron external states.
METHOD FOR ANALOG PLACEMENT AND GLOBAL ROUTING CONSIDERING WIRING SYMMETRY
(2011-11-10)
JIANG Iris Hui-Ru
;
YANG Yu-Ming
A method for analog placement and global routing considering wiring symmetry performs a layout for a circuit which is described by a netlist having a set of devices and wires. First, the method inputs the netlist, and each device thereof has a design constraint and a corresponding priority. Based on the priorities, it performs a sorting on the devices to establish a constraint library. Then, based on the design constraint and corresponding priority of each device, the method establishes a hierarchical constraint tree. According to the hierarchical constraint tree, the method performs placement of each device, wherein possible shape of each device is represented by a shape curve. For each placement of the device, the method calculates a corresponding cost function. Then, it selects an optimum placement of the device according to the cost functions. The method establishes an RSMT for each wire and then performs an analog routing.
Energy-efficient uplink resource allocation for IEEE 802.16j transparent-relay networks
(2011-11-10)
Liang, Jia-Ming
;
Wang, You-Chiun
;
Chen, Jen-Jee
;
Liu, Jui-Hsiang
;
Tseng, Yu-Chee
The IEEE 802.16j standard is defined to enhance WiMAX networks with relay capacity. Under the transparent mode, existing studies only target improving network throughput by increasing the transmission rates of mobile stations (MSs) and maximizing concurrent transmissions. However, using a higher transmission rate or allowing more concurrent transmissions could harm MSs in terms of their energy consumption, especially when they are battery-powered. In this paper, we consider the energy-conserved resource allocation problem in the uplink direction of an IEEE 802.16j network under the transparent mode. This problem asks how to arrange the frame usage with satisfying MSs' demands as the constraint and minimizing their total energy consumption as the objective. We prove this problem to be NP-complete and develop two energy-efficient heuristics, called demand-first allocation (DFA) and energy-first allocation (EFA) schemes. These heuristics employ a gradient-like search method to approximate the optimal solution. Specifically, DFA tries to satisfy MSs' demands first by using as less frame space as possible. Then, with the remaining frame space. DFA tries to save MSs' energy by lowering their transmission rates or adjusting their transmission paths. Viewed from a different perspective. EFA first allocates the frame space to MSs to consume the least energy. Since the total allocation may exceed the frame space. EFA then exploits spatial reuse and rate adjustment to pack all demands into one frame. simulation results show that our heuristics can approximate the ideal performance bounds and save up to 90% of MSs' energy as compared to existing results. (C) 2011 Elsevier B.V. All rights reserved.
Quantification and recognition of parkinsonian gait from monocular video imaging using kernel-based principal component analysis
(2011-11-10)
Chen, Shih-Wei
;
Lin, Sheng-Huang
;
Liao, Lun-De
;
Lai, Hsin-Yi
;
Pei, Yu-Cheng
Background: The computer-aided identification of specific gait patterns is an important issue in the assessment of Parkinson's disease (PD). In this study, a computer vision-based gait analysis approach is developed to assist the clinical assessments of PD with kernel-based principal component analysis (KPCA). Method: Twelve PD patients and twelve healthy adults with no neurological history or motor disorders within the past six months were recruited and separated according to their "Non-PD", "Drug-On", and "Drug-Off" states. The participants were asked to wear light-colored clothing and perform three walking trials through a corridor decorated with a navy curtain at their natural pace. The participants' gait performance during the steady-state walking period was captured by a digital camera for gait analysis. The collected walking image frames were then transformed into binary silhouettes for noise reduction and compression. Using the developed KPCA-based method, the features within the binary silhouettes can be extracted to quantitatively determine the gait cycle time, stride length, walking velocity, and cadence. Results and Discussion: The KPCA-based method uses a feature-extraction approach, which was verified to be more effective than traditional image area and principal component analysis (PCA) approaches in classifying "Non-PD" controls and "Drug-Off/On" PD patients. Encouragingly, this method has a high accuracy rate, 80.51%, for recognizing different gaits. Quantitative gait parameters are obtained, and the power spectrums of the patients' gaits are analyzed. We show that that the slow and irregular actions of PD patients during walking tend to transfer some of the power from the main lobe frequency to a lower frequency band. Our results indicate the feasibility of using gait performance to evaluate the motor function of patients with PD. Conclusion: This KPCA-based method requires only a digital camera and a decorated corridor setup. The ease of use and installation of the current method provides clinicians and researchers a low cost solution to monitor the progression of and the treatment to PD. In summary, the proposed method provides an alternative to perform gait analysis for patients with PD.
SENSING DEVICE
(2011-11-10)
Cheng Shih-Tung
;
Chou Po-Chien
;
Lin Yu-Cheng
A sensing device including a base, a pillar, an arm, a sensing element and a driving module is provided. The base has a supporting surface suitable for supporting the object. The pillar is disposed on the supporting surface. The arm has two ends and a pivot portion between the two ends. The pivot position is pivoted to the pillar along an axis substantially parallel to the supporting surface. The sensing element is disposed on the arm and located between an end and the pivot portion. The sensing element is located between the base and the object. The driving module is disposed between the arm and the base. The driving module drives the arm to pivot relatively to the pillar along the axis, and the sensing element moves toward or away from the object as the arm is pivoted.
Dual positive-feedbacks voltage controlled oscillator
(2011-11-10)
Lee Chen-Yi
A dual positive-feedbacks voltage controlled oscillator includes an oscillation circuit and a cross coupled pair circuit. The oscillation circuit includes a first transistor, a second transistor, an inductor and a plurality of capacitors. The gates of the first and second transistors are opposite to each other and coupled to two points of the inductor. The inductor and the capacitors are formed as a LC tank. The cross coupled pair circuit includes a third transistor and a fourth transistor. The gates of the third and fourth transistors are cross coupled to two points of the inductor. Thereby, the gate of the third transistor is coupled to the gate of the second transistor; the gate of the fourth transistor is coupled to the gate of the first transistor; the drain of the third transistor is coupled to the source of the first transistor; and the drain of the fourth transistor is coupled to the source of the second transistor.
Per-flow sleep scheduling for power management in IEEE 802.16 wireless networks
(2011-11-10)
Chen, Jen-Jee
;
Wu, Shih-Lin
;
Wang, Shiou-Wen
;
Tseng, Yu-Chee
;
資訊工程學系
Power management is a critical issue in IEEE 802.16 wireless networks. In the standard, a power saving class (PSC) of type II is defined to support real-time traffic flows. It allows a flow to switch periodically between active and sleep states to save energy. However, previous studies either consider adjusting start frames of PSCs by assuming that the PSCs are already given or assume one single PSC to accommodate all flows in a mobile station, thus leading to higher energy cost. This paper proposes two "per-flow" sleep scheduling schemes, which assign one PSC to each real-time flow according to its QoS parameters. This leads to less energy consumption, more efficient use of bandwidth, and more compact listening windows. We also prove that deciding whether a given scheduling problem is solvable can be reduced to a maximum matching problem, which is computationally tractable. Simulation results show that such a per-flow scheduling does perform much closer to the active ratio lower bound and achieve higher resource utilization than previous schemes. (C) 2011 Elsevier B.V. All rights reserved.
A highly efficient graphene oxide absorber for Q-switched Nd:GdVO(4) lasers
(2011-11-11)
Wang, Yong Gang
;
Chen, Hou Ren
;
Wen, Xiao Ming
;
Hsieh, Wen Feng
;
Tang, Jau
We demonstrated that graphene oxide material could be used as a highly efficient saturable absorber for the Q-switched Nd:GdVO(4) laser. A novel and low-cost graphene oxide (GO) absorber was fabricated by a vertical evaporation technique and high viscosity of polyvinyl alcohol (PVA) aqueous solution. A piece of GO/PVA absorber, a piece of round quartz, and an output coupler mirror were combined to be a sandwich structure passive component. Using such a structure, 104 ns pulses and 1.22 W average output power were obtained with the maximum pulse energy at 2 mu J and a slope efficiency of 17%.
A highly efficient graphene oxide absorber for Q-switched Nd:GdVO4 lasers
(2011-11-11)
Wang, Yong Gang
;
Chen, Hou Ren
;
Wen, Xiao Ming
;
Hsieh, Wen Feng
;
Tang, Jau
We demonstrated that graphene oxide material could be used as a highly efficient saturable absorber for the Q-switched Nd:GdVO4 laser. A novel and low-cost graphene oxide (GO) absorber was fabricated by a vertical evaporation technique and high viscosity of polyvinyl alcohol (PVA) aqueous solution. A piece of GO/PVA absorber, a piece of round quartz, and an output coupler mirror were combined to be a sandwich structure passive component. Using such a structure, 104 ns pulses and 1.22 W average output power were obtained with the maximum pulse energy at 2 mu J and a slope efficiency of 17%.
彩繪一下　舊社區容光煥發
(2011-11-13)
許鈺煊
;
Department of Communication and Technology
;
傳播與科技學系
隨著社群網站的興起，出遊的照片可以隨時隨地上傳分享，也因此旅遊景點間的流傳十分頻繁。而最吸引人注目的，便是那充滿故事以及創意的彩繪牆，一片老舊的房屋，搭配五顏六色的生動圖案，令人不禁想要親自拜訪當地，與彩繪的牆壁照幾張紀念的照片。
新消費型態淺談團購網
(2011-11-13)
劉力榛
;
Department of Communication and Technology
;
傳播與科技學系
近年來，隨著網路蓬勃發展，除了行之有年的網路拍賣外，2010年由美國的Groupon將「團購網」正式引入台灣，隨後台灣也出現了如GOMAJI、17P好康等團購網產生。團購網雖然大大地改變了消費型態，卻也帶來了不少的交易糾紛。
結婚　幸福百年
(2011-11-13)
陳昱均
;
Department of Communication and Technology
;
傳播與科技學系
「民國百年」這個特別的年份，加上明（民國101）年恰逢國人所喜愛的龍年，颳起了台灣的百年結婚潮。據內政部統計，今年十月全國共有22064對新人結婚，創八年來單月新高；今年一到十月的累計結婚對數為128120對，也較去年同期增加16110對，增加率為14.38％。
咖啡時光　咖啡人生
(2011-11-13)
林冠儀
;
Department of Communication and Technology
;
傳播與科技學系
十九世紀，法國文學家們在巴黎左岸的咖啡館裡文思泉湧，寫下永垂不朽的著作，抑或是展開一場文藝辯論；印象派畫家雷諾瓦在咖啡館裡靜靜觀察從容優雅的女侍，成為他畫筆下美麗的永恆。二十世紀，在文人墨客聚集的明星咖啡館，白先勇的《台北人》於焉而生。二十一世紀，在生活步調迅速的水泥叢林中，人們在咖啡館裡尋找一方慢活的空間，也尋找自己的咖啡人生。
獨具姿態的海王星　鄭宜農
(2011-11-13)
鄭巧琪
;
Department of Communication and Technology
;
傳播與科技學系
在極度暴躁的日子，孤獨無依的夜晚，總有那麼一個無壓力的女聲，不著痕跡的拉近人心的距離，撫平心裡的寂寞。她是新一代文青女聲，鄭宜農。
台北溫泉季　撞轎好熱血
(2011-11-13)
王俐文
;
Department of Communication and Technology
;
傳播與科技學系
一年一度的台北溫泉季在北投展開，熱鬧的市集和濃濃泡湯味的氣氛讓秋季的尾巴更為沸騰。來自日本松山寺的「撞轎」祭典也來共襄盛舉，將第一次的海外演出獻給北投。