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收集所有交通大學研究人員與學生個人或團體所發表之各項學術著作，涵蓋期刊論文、教師專書、學位論文等項。;;Collections of Publications of NCTU Researchers and Students Like Journal Papers and Thesis.

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🏛️國立陽明交通大學機構典藏

Subject: search.filters.subject.Efficiency

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Now showing 1 - 10 of 21
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    Accounting for air pollution emissions and transport policy in the measurement of the efficiency and effectiveness of bus transits
    (2020-05-27)
    Kang, Chao-Chung
    ;
    Feng, Cheng-Min
    ;
    Liao, Bo-Ruei
    ;
    Khan, Haider A.
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    運輸與物流管理系 註：原交通所+運管所
    This study presents a two-stage network performance evaluation model that determines the efficiency and effectiveness of bus transit systems. The model accounts for non-storable service features, undesirable outputs, and transport policy factors. The Taipei bus transit system is presented as an empirical case to measure the performance of bus transits with and without consideration of carbon dioxide (CO2) emissions and the transfer of riders. The results show that CO2 emissions and the transfer of riders are important factors for a performance evaluation model. Failure to include these results in an incomplete evaluation. Rather than focusing solely on marketable outputs, government agencies and managers must consider undesirable outputs or transport policy factors that relate to bus transits when measuring the efficiency and effectiveness of bus transits.
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    FAST AND ROBUST OBJECT SEGMENTATION APPROACH FOR MPEG VIDEOS
    (2006-01-01)
    Ahmad, Ashraf M. A.
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    資訊工程學系
    ;
    Department of Computer Science
    In this paper we propose an efficient approach for Motion Vector (MV) based object detection in MPEG-1 video streams. Based on experimental results performed over the MPEG testing dataset and measuring performance using the standard recall and precision metrics for perceptual performance, and run time metric for efficiency performance. Our approach is remarkably superior to the alternative techniques. in addition to these results, we describe a user system interface that we developed, where users can maintain the configurations interactively.
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    Productivity comparison of European airlines: bootstrapping Malmquist indices
    (2016-11)
    Yang, Chyan
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    Wang, Tung-Pao
    ;
    經營管理研究所
    ;
    Institute of Business and Management
    The study explored the operating efficiency and variability of productivity estimates of European airlines. We applied Malmquist productivity indices (MPI) with a bootstrap method to assess the productivities of European airlines in four regions in Europe. The productivity of small-sized airlines lagged further behind that of large-sized airlines because of their inferior technological change (TC) effects derived from inefficient resource allocation to sustain a competitive advantage. This study also indicated that the Western European airlines were more efficient on average than those in other areas of Europe. The applications of Malmquist productivity techniques in assessing the performance of European airlines are highlighted in their effective resource allocation, sustained competitive advantage and optimized operating performance.
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    Sufficient dimension reduction with additional information
    (2016-07)
    Hung, Hung
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    Liu, Chih-Yen
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    Lu, Henry Horng-Shing
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    統計學研究所
    ;
    Institute of Statistics
    Sufficient dimension reduction is widely applied to help model building between the response and covariate X. In some situations, we also collect additional covariate W that has better performance in predicting Y, but has a higher obtaining cost, than X. While constructing a predictive model for Y based on (X, W) is straightforward, this strategy is not applicable since W is not available for future observations in which the constructed model is to be applied. As a result, the aim of the study is to build a predictive model for Y based on X only, where the available data is (Y, X, W). A naive method is to conduct analysis using (Y, X) directly, but ignoring W can cause the problem of inefficiency. On the other hand, it is not trivial to utilize the information of W to infer (Y, X), either. In this article, we propose a two-stage dimension reduction method for (Y, X) that is able to utilize the information of W. In the breast cancer data, the risk score constructed from the two-stage method can well separate patients with different survival experiences. In the Pima data, the two-stage method requires fewer components to infer the diabetes status, while achieving higher classification accuracy than the conventional method.
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    Volterra Nonlinearity Compensator for I/Q Imbalanced mm-Wave OFDM RoF Systems
    (2015)
    Huang, Hou-Tzu
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    Lin, Chun-Ting
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    Chiang, Shou-Chi
    ;
    Lin, Bo-Jiun
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    Shih, Po-Tsung (Boris)
    We demonstrate experimentally, the use of an I/Q Volterra series-based algorithm to successfully compensate for nonlinearities in a wideband mm-wave RoF system having I/Q imbalance. The capacity of the system was doubled from 14.8 Gb/s to 29.6 Gb/s, while fulfilling FEC performance requirements.
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    尋路能力與道路環境對尋路效率影響之研究
    (2009)
    張新立
    ;
    CHANG HSIN-LI
    ;
    國立交通大學運輸科技與管理學系(所)
    「尋路效率」表示一個人在尋找目的地的過程中所花費時間的長短與走錯路次數的 多寡。低落的尋路效率不但會浪費時間與金錢，延誤救護與救災的時機，更可能因急於 找路、產生焦慮而造成危險。尋路效率受個人之尋路能力與道路環境兩種因素所影響， 個人之尋路能力因素包含了方向感、對環境之熟悉度與尋路策略之使用，而道路環境因 素則包含了建築密度、地標與道路格局。 本研究透過尋路能力量表之建立，並發展尋路效率的量測指標，配合不同之道路環 境條件進行實驗，除可了解不同道路用路人之尋路能力差異外，更可檢視不同道路環境 對尋路效率之影響效果。本研究之理論探討與實證研究結果，除可供道路設計與資訊提 供之參考，亦可建立標準化之道路指引說明，提升民眾講解路線與理解道路資訊之能力。
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    智慧型電梯節能技術研發( II )
    (2010)
    李安謙
    ;
    LEE AN-CHEN
    ;
    國立交通大學機械工程學系（所）
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    聯絡網路的可靠度及有效性
    (1999)
    張鎮華
    ;
    Chang Gerard Jennhwa
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    交通大學應用數學系
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    Fabrication and Configuration Development of Silicon Nitride Sub-Wavelength Structures for Solar Cell Application
    (2010-09-01)
    Sahoo, Kartika Chandra
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    Chang, Edward Yi
    ;
    Li, Yiming
    ;
    Lin, Men-Ku
    ;
    Huang, Jin-Hua
    To replace the double layer antireflection coating and improve the efficiency of solar cell, a self assembled nickel nano particle mask followed by inductively coupled plasma (ICP) ion etching method is proposed to form the sub-wavelength structures (SWS) on silicon nitride (Si(3)N(4)) antireflection coating layers instead of semiconductor layer. The size and density of nickel nano particles can be controlled by the initial thickness of nickel film that is annealed to form the nano-particles on the Si(3)N(4) film deposited on the silicon substrate. ICP etching time is responsible for controlling the height of the fabricated Si(3)N(4) SWS on silicon substrate, which is seen from our experiment. It is found that the lowest average reflectivity of 3.12% for wavelength ranging from 350 to 1000 nm is achieved when the diameter and height of the SWS are 120-180 nm and 150-160 nm, respectively. A low reflectance below 1% is observed over the wavelength from 590 to 680 nm for the fabricated Si(3)N(4) SWS on silicon subs. The efficiency of Si(3)N(4) SWS could be improved by 1.31%, compared with the single layer anti-reflection (SLAR) coatings of Si(3)N(4), using PC1D program. The results of this study may benefit the fabrication of solar cells.
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    Solution-processable tandem solid-state light-emitting electrochemical cells
    (2013-12-01)
    Lu, Jung-Sheng
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    Kuo, Jung-Chin
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    Su, Hai-Ching
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    照明與能源光電研究所
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    Institute of Lighting and Energy Photonics
    Compared to organic light-emitting diodes (OLEDs), solid-state light-emitting electrochemical cells (LECs) exhibit simple single-layered structure and low operating voltages due to in situ electrochemical doped layers. However, device efficiencies of LECs are usually lower than those of sophisticatedly designed OLEDs. Furthermore, device efficiencies and lifetimes of LECs degrade significantly as brightness increases. In this work, we demonstrate tandem LECs to obtain nearly doubled light outputs (mu W cm(-2)) in comparison with single-layered LECs under similar current densities. Since the output EL emission is modified by microcavity effect of the device structure, the EL spectra of tandem LECs exhibit EL emission peak at ca. 625 nm while the EL spectra of single-layered LECs center at ca. 660 nm. Better spectral overlap between the EL spectrum of tandem LECs and the luminosity function results in further enhanced candela values, rendering a tripled brightness (cd m(-2)). The device efficiencies can be optimized by adjusting the thickness of the connecting layer between the two emitting units of the tandem devices. The peak external quantum efficiency achieved in tandem LECs is up to 5.83%, which is higher than twice of that obtained in single-layered LECs due to improved carrier balance. When single-layered and tandem LECs are biased under higher voltages to reach similarly higher brightness, tandem LECs show higher device efficiencies and longer lifetimes simultaneously. These results indicate that device efficiencies and lifetimes of LECs can be improved by employing a tandem device structure. (C) 2013 Elsevier B. V. All rights reserved.