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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
221

Control of liquid crystal pretilt angle using nanoparticles and azo-dye induced alignment

Tsai, Yi-tai 02 July 2010 (has links)
This work demonstrates the pretilt angle controllable photo-alignment effect in nanoparticles and azo-dye doped liquid crystal film. Followed by increasing the absorbed azo-dye, the vertical alignment induced by nanoparticles of polyhedral oligomeric silsesquioxanes (POSS) can be changed from high pretilt to low pretilt angle. Competition between the homogeneously aligned azo-dye and POSS-induced spontaneous vertical alignment domain generated the variable pretilt angle. The pretilt angle is a function of the pumping intensity and can be controlled continuously within the range of 0¢X~90¢X. With the sufficient absorption of photo excited azo-dye, The POSS induced vertical alignment can be switch to homogeneous alignment. The pretilt angle and surface energy are also examined to confirm the alignment effect. Both nanoparticles and azo-dye induced vertical and homogeneous alignment are non contact methods, and suitable for low temperature plastic process.
222

The Impact of IT Governance on Strategic Aligment and Organization Performance

Chiu, Yi-chieh 19 January 2011 (has links)
In modern dynamic business environment, every enterprise needs to emphasize more on IT in order to increase the benefit. The well-performed IT governance is the key to effectively apply IT resource. This research focus on the following dimension: IT governance maturity, IT Governance Archetype, Strategic alignment and Organization performance. Accoridng to the literature, an empirical research was performed to examine the relation among these four dimensions. Through the empirical research, this research verify the significant positive relation among IT governance maturity, strategic alignment and organization performance. Also among IT governance Archetype (the level of centralized) and strategic alignment. As for IT governance Archetype (the level of professionalize), there is significant positive relation between IT governance Archetype (the level of professionalize) and stragic alignment and significant negative relation between IT governance Archetype (the level of professionalize) and organization performance.
223

Influence of polymerization conditions on electro-optical properties of encapsulated cholesteric LCD

Wang, Wei-Yuan 18 July 2011 (has links)
This paper study the influence of surface properties of encapsulated CLC on response time and reflectance via polymerization induced phase separation. The cured polymer layer, which is composed of the mixture of EMA and TRI, adhere to the inside of the non-treated glass substrate and change the surface properties to vertical alignments. Different boundary conditions caused by various UV curing intensity and cell gap lead to different electro-optical properties for CLC display. With a proper boundary structure, the transition time from homeotropic to planar of CLC can be reduced obviously with slightly reduced reflectance.
224

Study of Charge Transport Properties of Discotic Liquid Crystal Semiconductors

Jian, Fei-Syong 13 August 2012 (has links)
Discotic liquid crystals (DLCs), which consist of disk-like molecules, have recently attracted considerable attention for their interesting electronic properties. One of the most significant of DLCs is their high charge carrier mobility in their columnar structure. Recently the number of researches have been increasing on applications such as organic light-emitting diodes (OLED), photovoltaic devices (OPV) and organic field-effect transistors (OFET). The purpose of the study is to investigate the mobility of different alignment of DLCs. The material used in the present study is HDBP-8. We will show that the stack of DLCs depended on temperature strongly. We will also discuss charge transport properties of homeotropic alignment. Carrier transport has been investigated in the hexagonal columnar (Colh) mesophase of HDBP-8 using time-of-flight (TOF) technique. The carrier mobilities are up to the order of 10-3 cm2V-1s-1 for both positive and negative charges with weak dependence on the electric fields.
225

An Approach for Solving the Constrained Longest Common Subsequence Problem

Peng, Chao-Li 28 August 2003 (has links)
A subsequence is obtained by deleting zero or more symbols from a given sequence. For given two sequences, the longest common subsequence problem is to find a common subsequence whose length is the longest. The constrained longest common subsequence (CLCS) problem is to find a longest common subsequence that contains a specific subsequence. Note a CLCS may be shorter than an LCS. In this thesis, we propose a dynamic programming algorithm for solving the CLCS problem. The time complexity is O(pmn), where m and n are the lengths of the given sequences and p is the length of the constraint sequence. Our algorithm can also be applied to solve the constrained sequence alignment problem, which is a sequence alignment problem with the requirement that some specific symbols must be aligned together.
226

Sensor Alignment Correction for Ultra Short Baseline Positioning

Du, Kung-wen 27 April 2006 (has links)
The performance of an ultra-short baseline (USBL) positioning system is limited by noises and errors from physical environment and other sources. One of the major errors in USBL positioning is to neglect the sensor misalignment which produces static yaw, pitch, and roll offsets. In this study, a circular survey observation scheme is first proposed to study the positioning errors of a USBL system with a fixed seabed transponder. The center of the circular survey scheme is assumed to be located over the top of the transponder. Mathematical equations of the transponder positioning with yaw, pitch, and roll offsets are derived, respectively. According to characteristics of positioning errors arose from yaw, pitch, and roll offsets, an iterative procedure of first getting roll offset, next computing yaw offset, and then obtaining pitch offset for sensor misalignment correction is established. Simulation results indicate that the iterative procedure can effectively obtain all offsets with high determination accuracy and the computation can rapidly converge to desired error tolerance in a few iterations. However, the center of circular vessel survey scheme is almost impossible to be exactly located over the top of the transponder. In such a case, the horizontal positioning error resulting from pitch offset or roll offset is no more a circle function. As a result, it will fail to evaluate the angle offsets through above iterative procedure unless the deviation from real and estimate horizontal transponder position is extremely small comparing to the transponder depth. Therefore, in addition to circular survey scheme, this study proposed a straight survey scheme to study the patterns of positioning error resulting from yaw, pitch, and roll offsets. Similar to the philosophy of establishing the iterative procedure described above, the iterative procedure of first getting pitch offset, next computing roll offset, and then obtaining yaw offset for sensor misalignment correction is established. Again, simulation results show that the iterative procedure can find all offsets with high determination accuracy and has the advantage of quick converging. Besides, the iterative procedure can still obtain correct angle offsets even though there is a constant heading deviation from the direction of the straight vessel track during vessel survey.
227

The Relationship Between Strategic Alignment of Information Systems and Performance Impact in Hospitals

Huang, Ying-Hsiang 08 June 2006 (has links)
ABSTRACT The Relationship Between Strategic Alignment of Information Systems and Performance Impact in Hospitals Huang, Ying Hsiang The Taiwan government implemented the National Health Insurance (NHI) program in 1995 to provide comprehensive and uniform health services to the entire population. The ensuring phenomenon from the implementation of the NHI program is the furious competition in the healthcare market that has become matured. To survive, hospitals need to enhance efficiency and provide high quality of care to the patients. Often, hospitals cope with external environmental changes through the choice and application of appropriate strategies. Forming strategic alignment with resources is an increasingly adopted strategy by hospitals. The recognition of information systems (IS) as the most valuable resource has motivated hospitals to engage in their formal management. To achieve better hospitals¡¦ performance from managing IS, management strategists recommend that hospitals relate IS management with business activities in hospitals. As a resource, IS can be related to business through alignment (in terms of strategic alignment of IS), as is applicable to other resources such as manpower resources. Despite interest in managing IS, however, there has been little or not research about aligning IS with business in hospitals. Lack of empirical evidence creates a gap between the theory and practice of strategic alignment of IS. In this study, to integrated theories about IS and alignment to develop an alignment framework and model for IS alignment research, developed a strategic alignment construct, and empirically tested the alignment model within the mediation perspectives along with the Venkatraman¡¦s theory. Mediation was interpreted as the mechanism through which IS strategy could catalyze business strategy for the attainment of better performance. Data from hospitals¡¦ survey in Taiwan was analyzed using the variance-based partial least square and multiple regression method. IS strategy and business strategy in mediating the performance, the links were examined. Results indicate that strategic alignment of IS positively impact performance, explaining about 52.4% of its variation. In all models, the interactionist perspective as the better mediator of hospitals¡¦ performance. Through exploratory, an important management implication of this study is that it may make more sense for hospitals to orientate their business strategies and operations based on their IS resources strategic alignment rather than engage in IS function as a response to business needs since this study shows such strategic alignment of IS contributed on performance with 8.4% of its variation.
228

How to Identify, Develop, Deploy, and Connect Talents When Companies Transform to Global Integrated Enterprise The Case of Advantech

Hsiao, Wei-chi 19 January 2009 (has links)
Globalization is viewed as a centuries-long process, its various aspects which affect the world in several different ways such as industrial emergence of worldwide production markets and broader access to a range of foreign products for consumers and companies (Craig, C.S, 2003). Under globalization, companies meet the increasing challenge to fulfill the demands of markets. In order to response to market effectively and make best use of resources globally, IBM brought up a concept of ¡¥Global Integrated Enterprise (GIE)¡¦ in 2007. GIE affects companies and industries in the practices of organization transformation greatly. Advantech experienced the decline of growth from the middle of 2006. In order to obtain the competitive advantage, the company seeks for organization transformation. GIE is introduced to Advantech in the middle of 2007. Advantech began to arrange GIE transformation strategies and implemented GIE transformation in 2008 officially. While Advantech implements GIE transformation, it requires support functions to provide correspondent systems in organization transformation processes. Talent management is one of the most important issues for Advantech to deal with. Therefore, Advantech implements the talent management model which includes the functions of talent identification, talent development, talent deployment, and talent connection simultaneously. This research presumes that there are positive effects out of the implementation of talent management model. The expected effects include: 1) organization capabilities which are evoked by the implementation of talent development practices, 2) alignment which is affected by the implementation of talent deployment practices, and 3) employee commitment which is inspired by the implementation of talent connection practices. To continue, this research assumes that the implementation of talent management model is effective in terms of positive performance. Hence, this research aims at interpreting the relationship between capabilities, alignment, commitment, and organizational performance.
229

A Practical Alignment Algorithm For Cassegrain Type Telescopes

Benli Ozturk, Esra 01 August 2012 (has links) (PDF)
Focal plane corrected Cassegrain type optical systems have been widely used in various fields. The axial alignment of complex optical systems is not easy and a practical alignment method is needed for such systems. Tilts, decenters and axial motion of elements or group of elements in the system are the typical alignment parameters. Interferometric measurement is an effective way to see the errors caused by the misalignment of each element in an optical system. In this thesis, alignment of a Cassegrain type telescope will be examined by using interferometric measurements and modulation transfer function simulations.
230

Capillary electrophoresis coupled with electrochemical detection: improvement in capillary- electrode alignment by commercial multi-channel fiber optic connectors

Cheng, Chun-wen 29 June 2001 (has links)
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