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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.
241

InAs-GaSb Superlattice Band Structure Studied By Bond Orbital Model

Lee, Tzu-Yao 27 June 2001 (has links)
We study the electronic band structure of no-common-atom InAs-GaSb superlattice within a nearest-neighbor bond-orbital model. The effect of interfacial asymmetry is also taken into account. This model can reproduce fairly accurate bulk band structures near the center of the Brillouin zone. We find that interfacial asymmetry, which is first included in bond-orbital model, can yield spin splitting. We also find that a negative indirect band gap appears for long period superlattice, due to interfacial asymmetry and band anisotropy of the heavy hole band in GaSb material. This indicates that the semiconductor-semimetal transition, which occurs when the period d reach a critical value dC, does exist in InAs-GaSb superlattice. In our calculation, the critical period dC is about 150 Å.
242

none

Wu, Guo-Chiang 04 July 2001 (has links)
After the happen of Asia Financial Crisis in 1997, the ecology of the TFT-LCD industry has been changed dramatically. As many companies invested lots of money to enter the industry in Taiwan , Japan¡B Sound Korea and Taiwan will be the three main contenders within the TFT-LCD industry in the 21st century. This study is focused on factors what make firms, which manufacture TFT-LCD panels in Taiwan, choice different entry models when they entered the TFT-LCD industry. This study selects effective variables by the researches about aspects of external environment analysis and internal resource analysis. The variables of macro-environment include ¡§Politics¡¨¡B¡¨Law¡¨¡B¡¨Economy¡¨ and ¡§Technology¡¨. The variables of industry environment include ¡§Entry Barrier¡¨¡B¡¨Industrial Structure¡¨ and ¡¨Growth Opportunity ¡¨. The variables of internal resource include ¡§Tangible Asset¡¨¡B¡¨Intangible Asset¡¨¡B¡§Human Resource ¡§¡B¡¨Personal Capability¡¨ and ¡§Organizational Capability¡¨. By the procedures of case study research to gather secondary data and interview the senior managers of three TFT-LCD panel manufacturing firms, the results are as following: 1. The factors of external environment affect the entry model indirectly. 2. It is necessary to own lots of financial assets to enter the TFT-LCD industry, but it is not a factor which affects the entry model. 3. The difference of resource configuration will affect the entry model. 4. Intangible assets and organizational capabilities affect the entry model directly. 5. The effect of internal resource factors on the entry model is more powerful than the external environment factors. Key words : Entry Model¡BTFT-LCD .
243

Image-based 3D Model Construction

Chen, Kuan-Chen 25 July 2001 (has links)
The shape construction of three-dimensional objects has numerous applications in area that include manufacturing, virtual simulation, science, medicine, and consumer marketing. In this thesis, we consider a automatic system which captures and triangulates views of a real world 3D objects and finally registers and integrates them. There are four steps in our system, image acquisition, image processing, model construction and stereoscopic display. First step, image acquisition, we take 2D image pairs (by CCD camera movement) from different angles of the model with one CCD camera. Second step, image processing. In order to derive depth form two images captured by the CCD camera, we find registration points between two images by using image segmentation, feature extraction, image registration. Third step, 3D model construction, we divide it into three parts. First part, we generate partial depth surface by Delaunay triangle splitting , and for a selected set of viewing directions. Second part of this step, different surfaces have to be mapped into a uniform coordinate system for the given 3D object. Integration of registered surfaces defines the third part of the model construction. This finally, can lead to the generation of a complete 3D model of the given scene or of the given object. After generating a complete 3D model, we create a stereoscopic view in last step. We put on the LC-Shutter-Glasses and look through the lenses at high-resolution full color display while the lenses "shutter" on and off alternatively. The monitor displays only the left view while the right lens of the glasses shutters, and display the right view while the left lens of the glasses shutters.
244

Approach to the Business Model of the B2B E-Marketplace in Taiwan¡ÐTake the Steel And the Motor Vehicles And Parts Industry for Examples

Liao, Yu-Chun 04 February 2002 (has links)
Among the development of the B2B E-commerce, the B2B e-marketplace is the most noticeable one in the world. However, does the B2B e-marketplace really make the performance of the companies in every industries improve greatly? The target of this thesis is to analysis the business models of the B2B vertical e-marketplace in Taiwan. To find any causes in the industries those will hinder or reinforce the development of the B2B vertical e-marketplace is one of the study purposes. The author takes the steel industry and motor vehicles and parts industry for examples to analysis deeply. Using the methods of the quality research, the author has many interviews with managers who have experiences in steel or motor industries. According to the findings in the research, we have some inferences about the business models of the future vertical e-marketplace in the steel and motor vehicles and parts industries. In the steel industry, the author has five inferences. (1)The e-marketplace is managed by the company that has goodwill and domain knowledge in the steel industry. (2) The participators of the steel e-marketplace are localized companies, which business contain from steel-making to steel-processing. (3)The products traded in the steel e-marketplace are spot goods these are the inventories. (4)Buyers and Sellers exchange the spot goods by the action on the Internet. (5) The e-marketplace will provide the companies these added-services, such as to confirm the financial credit of the buyers or help the buyers to finance their capitals from the banks. In the motor vehicles and parts industry, the author has four inferences. (1)The e-marketplace is managed by the company that has goodwill and domain knowledge in the motor industry. In addition, the company operates it that familiar with the B2B e-commerce. (2) The products traded in the motor e-marketplace are direct or indirect materials those are made by lower-level technology. (3) The participators of the motor e-marketplace are automobile manufacturing companies and first-tier suppliers. (4) Buyers and Sellers exchange the spot goods by the many-to-many actions, negotiation and contracts on the Internet.
245

none

Liao, Yuan-hung 31 May 2002 (has links)
none
246

The study of industry convergence and entrepreneurial model

Yang, Shun-Hui 23 July 2002 (has links)
none
247

Intangible Assets Pricing Model in Biotech Industry

YANG, MORRIS 01 July 2003 (has links)
Abstract Intangible Assets Pricing Model in Biotech industry In the era of knowledge-based economic, the revenue creation model of companies are transiting from conventional fixed-assets focus to new intellectual assets, brand names, and customer needs focus. Taiwan industries also jumped into this wagon and are gradually switching from the equipment manufacturers (OEM) model focused on production to a new type of model concentrated on the conjunction of technology, brand, and services. After the revision of corporation law in 2001 to stipulate that companies are allow to capitalization of their technology or goodwill, it is becomes a must to establish a well accepted pricing model for these intangible assets to the banks or industry-wide. The key of the pricing model is how to apply the valuation rules, which are commonly for the tangible assets, to the intangible assets. The pricing model will be able to act as a start point for the traders to negotiation, and decrease the transaction costs related to information non-transparence or information gathering. This paper tried to survey all the possible pricing models, regardless of theoretical and empirical ones, and make a comparison among these models. In addition, there is an analysis of market information in biotech development. At last, this paper explored some current applied pricing models by interviewing the people in the industries and using cases studies. Although there is no wide-accepted valuation l to apply, the searching as many models as possible may provide various ways to re-evaluate pricing models, and in the hope to come up a result reflected closer to the reality.
248

Bayesian model selection using exact and approximated posterior probabilities with applications to Star Data

Pokta, Suriani 15 November 2004 (has links)
This research consists of two parts. The first part examines the posterior probability integrals for a family of linear models which arises from the work of Hart, Koen and Lombard (2003). Applying Laplace's method to these integrals is not entirely straightforward. One of the requirements is to analyze the asymptotic behavior of the information matrices as the sample size tends to infinity. This requires a number of analytic tricks, including viewing our covariance matrices as tending to differential operators. The use of differential operators and their Green's functions can provide a convenient and systematic method to asymptotically invert the covariance matrices. Once we have found the asymptotic behavior of the information matrices, we will see that in most cases BIC provides a reasonable approximation to the log of the posterior probability and Laplace's method gives more terms in the expansion and hence provides a slightly better approximation. In other cases, a number of pathologies will arise. We will see that in one case, BIC does not provide an asymptotically consistent estimate of the posterior probability; however, the more general Laplace's method will provide such an estimate. In another case, we will see that a naive application of Laplace's method will give a misleading answer and Laplace's method must be adapted to give the correct answer. The second part uses numerical methods to compute the "exact" posterior probabilities and compare them to the approximations arising from BIC and Laplace's method.
249

Consequence analysis of aqueous ammonia spills using an improved liquid pool evaporation model

Raghunathan, Vijay 17 February 2005 (has links)
Source term modeling is the key feature in predicting the consequences of releases from hazardous fluids. Aqueous ammonia serves the purpose of a reducing medium and is replacing anhydrous ammonia in most of the Selective catalytic reduction (SCR) units. This newly developed model can estimate the vaporization rate and net mass evaporating into the air from a multicomponent non- ideal chemical spill. The work has been divided into two parts. In the first step a generic, dynamic source term model was developed that can handle multicomponent non-ideal mixtures. The applicability of this improved pool model for aqueous ammonia spills was then checked to aid in the offsite consequence analysis of aqueous ammonia spills. The behavior of the chemical released depends on its various inherent properties, ambient conditions and the spill scenario. The different heat transfer mechanisms associated with the pool will strongly depend on the temperature of the liquid pool system at different times. The model accounts for all the temperature gradients within the contained pool and hence helps us establish better estimation techniques for source terms of chemical mixtures. This research work will help obtain more accurate and reliable liquid evaporation rates that become the critical input for dispersion modeling studies.
250

A study of a Scale-sized Model for Analysis of Vehicular Antennas

Hsu, Yu-ching 20 June 2008 (has links)
In this study, we establish a car model which better resembles a real car and compare with the simplified car model as a reference. When taking the circular polarization antenna into consideration, we need the refined car model in the simulation. Besides, TPMS antenna measurements are conducted and the results are compared with the simulation to verify the accuracy of our simulation. The result of the simulation shows that the signal cannot be received when TPMS antenna is mounted on the rear tires. Proper solution is suggested to alleviate this problem. Due to the limitation of the measurement environment, we consider using scale-sized car model for the measurement of the antenna radiation pattern. Also, we compare the radiation pattern in the scale-sized car model with that in the full-sized car model. For the measurement of the vehicular antenna, we find that using the scale-sized car model for the preliminary estimation of the antenna radiation pattern is feasible and practicable.

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