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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.
31

Six-band Antenna Design for the Mobile Phone

Lee, Cheng-tse 02 July 2007 (has links)
A six-band antenna design for the mobile phone is presented. The required bandwidth for DTV/GSM850/900/DCS/PCS/UMTS operation is achieved by using two antennas. For DTV/GSM850/900 operation, we propose a novel antenna by using the concept of the dipole antenna and an internal matching portion to excite the half- and one-wavelength resonant modes of the antenna. With the internal matching portion, the frequency ratio of the two resonant modes can be controlled, thereby making the two resonant modes formed into a very wide operating band. For DCS/PCS/UMTS operation, a novel monopole slot antenna is used. The lower-edge frequency of the slot antenna depends on its length and the required bandwidth can be achieved by adjusting its tuning section. Effects of casing and human body on the proposed mobile phone antenna are also discussed. It is found that the radiation efficiency of DTV/GSM bands is larger than that of DCS/PCS/UMTS bands in this design. However, overall the operating bands, the antenna performances are greatly affected when the human effects are taken into considerations.
32

DTV antennas for mobile applications

Yang, Yu-Chan 06 June 2008 (has links)
The study in this thesis focuses on the DTV antennas for mobile applications. By using the novel techniques in the proposed antenna, the narrow-band problem and the radiation pattern of the conventional DTV antenna can be improved. In the first design, the antenna comprises two radiating arms. By adjusting the open gap between the ends of the two radiating arms, large impedance bandwidth can be obtained for DTV signal reception. In the second design, by integrating a coupling portion into the dipole antenna, the full-wavelength resonant mode can be excited successfully and combined with the half-wavelength mode to form a wide operating band. Finally, in the third design, a U-shaped feeding gap is embedded within the V-shaped antenna to excite the full-wavelength resonant mode. Additionally, the dipole antenna can radiate comparable E£X and E£c components, resulting in no nulls in the total-power radiation patterns in the horizontal and vertical planes.
33

A Study of Social Judgement Theory for Conflict Management : Case of CPC Yung-An LNG Receiving Terminal

Pan, Cheng-chang 01 September 2008 (has links)
¡@Because the public take account of ecological and environmental protection, there are many conflicts between the public and constructors to trigger many obstacles and duels in construction of many infrastructures. Thus, tradeoff between environment, lives, property and economic benefits is a big problem. In the researches of plural public affairs decision making and cognition impact management problems, practical researches found that Hammond(1965, 1975, 1996) developed SJT(Social Judgement Theory) from Lens model and had significant effects and contributions for analysis of public affairs decision making. The thesis uses SJT and studies cognition conflict management on representative case of environmental protection ¡¥the construction of CPC Yung-An LNG¡¦ in Taiwan. ¡@CPC Yung-An LNG began construction in May in 1984. Because environmental consciousness rose, the public gave relief to themselves when encountering environmental pollution. Negligence of communication with the village and of good-neighborliness makes the village not make allow and trigger Yung-An village dueled. This study bases on economic environment, gathers relative literatures and presents four controversial and representative topic for decision variables. They are individually ¡¥X1(benefit of construction of the firm)¡¦ and ¡¥X2(subsidies for the residents)¡¦ for economy, ¡¥X3(threat for ecology and environment)¡¦ for environment and ¡¥X4(threat for lives and property)¡¦ for both economy and society. ¡@This study uses SJT on the construction of ¡¥CPC Yung-An LNG¡¦ for cognition conflict management. The results are as below: (i)Government has higher stability and consistency of making decision than the residents. (ii)Government and the residents have significant difference for weight mean values of X1, X2 and X4. And they are the conflicts between them. (iii)Men and women have no significant difference for weight mean values of all decision variables. (iv)The older deciders have higher emphasis on X3 than the younger. But they have no significant difference for weight mean values of the other decision variables. (v)Lower educational background deciders have higher emphasis on X4, and there is no significant difference for all the other decision variables. (vi)There is no significant difference for weight mean values of all decision variables between core and border area. ¡@Finally, the study gets the judging principles of government and the residents. They are ¡¦average weights¡¦ and ¡¥function types¡¦ of all decision variables. Then, we use ¡¥specify¡¦ on Policy PC 3.0 software to make estimated judging table for all decision situations for government and the residents. Looking into the table can estimate the acceptance of government and the residents for all combinations of decision variables when making policies. We also can use the table to estimate the change of acceptance of government and the residents when any decision variables improve, and the authorizations can use the resources for the most efficient and effective applications when proposing improving methods.
34

Internal material handling at Volvo Construction Equipment Braås

Saleh, Fatima, Bartsch, Susann, Steen, Jessica January 2008 (has links)
<p>Background: Material handling is a large part of a company´s internal work and represents between 15 % and 70 % of the total cost of a manufactured product. By improving the internal handling of material, more efficient distribution and manufacturing flows are possible. The material handling process is an input to the production and assembly process that has to be defined and mapped so that it can be improved. The material handling process studied at Volvo CE Braås includes goods receiving, storage, packaging as well as the order/delivery process to assembly, and will finish with the material transport to the assembly line.</p><p>Research questions: How can the material handling process, from goods receiving to assembly line, at Volvo CE in Braås be described by using VSM? What kinds of waste can be identified? By proposing a future-state map, how can the identified problems and waste be reduced or eliminated?</p><p>Methodology: This thesis is a descriptive case study and was conducted with a deductive approach. Data was collected by our own observations, personal interviews, statistics, benchmarking and questionnaire. The scientific credibility of this thesis was secured by for example using many sources, avoidance of assumptions, studying a common process and following standardized steps of the VSM tool.</p><p>Conclusions: The material handling process was described in the separated areas of goods receiving, storage and assembly line. Visualization was given in a current-state map. Five different kinds of waste were identified. Finally, suggestions of improvements were presented along with a future-state map.</p><p>Suggestions on future research: A more detailed VSM including information flow and lead times could be studied. Scenario simulations of critical areas within the material handling process could be preformed. Furthermore, an ABC classification of articles and storage locations can be done to optimize storage.</p>
35

A ground clutter processor for the Royal Observatory's 10-cm meteorological radar /

Li, Chung-sum, Peter. January 1983 (has links)
Thesis (Ph. D.)--University of Hong Kong, 1984.
36

TUT Prof receives special honour

22 March 2012 (has links)
Professor Pieter Marais, Executive Dean of the Tshwane University Technology’s (TUT) Faculty of Science, received a special award from the Director-General of the Department of Science and Technology, Dr Phil Mjwara, at a breakfast meeting of the South African Council for Professional Natural Scientists (SACNASP) recently
37

Pieno gamybos kontrolės raida Lietuvoje / Evoliution of quality control of milk receiving in Lithuania

Petkevičiūtė, Jolanta 17 April 2007 (has links)
Milk quality is the rate which takes in a normal composition and a tipical characteristic. The standards and other documents like veterinary - sanitary instruction are making to secure and to control a quality of milk. In the period from 1938 to 2007 the standards of milk quality was changed very often and requirement of an animal welfare, of milk process and a primary milk processing, of staff hygiene and milk quality was tightened up. There was changed a primary milk quality valuation – for procurement milk temperature, acidity, milk cleanness and density. Most of all in the period from 1993 to 2007 was changed the norms and evaluation of milk bacterial pollution and somatic cell count. In 1970 in veterinary - sanitary instructions milk was sorted out, but in 2004 05 01 when Lithuania joined in to EU, sorts of milk was canceled. In period from 1938 to 2007 when was improved on technology most of all milk composition and milk quality evaluations was changed and became more scientific, more faster and cheaper.
38

Signals in nonlinear bandpass systems / Ian W. Dall

Dall, Ian W. (Ian William) January 1991 (has links)
Bibliography: leaves 222-230 / xiv, 230 leaves : ill ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Electrical and Electronic Engineering, 1992
39

Integration of Internet of Things technologies in warehouses : A multiple case study on how the Internet of Things technologies can efficiently be used in the warehousing processes

Bieringer, Alexandra, Müller, Linda January 2018 (has links)
No description available.
40

Potential benefits of Lean orientated goods receiving : A case study on how a Lean philosophy in the goods receiving process could affect a company’s value stream

Bengtsson, Sebastian, Ohlin, Sebastian January 2018 (has links)
Purpose – The purpose of the study is to Explore how the lean philosophy can affect the value flow of a manufacturing company’s goods receiving. To answer the purpose two research questions has been asked:1. Which lean tools or methods could be applied on a manufacturing company’s goods receiving?2. How can lean-orientated goods receiving lead to improved value flow?Method – To achieve the purpose a literature review and a case study has been conducted. The case study has had a deductive approach and used the both quantitative and qualitative data. The authors chose the data collection methods interviews, observations and document studies to collect empirical data which have then been analyzed against the theoretical framework with pattern matching to reach a result.Findings – The study has showed that Lean philosophy affects the value stream performance in various ways depending on which tools or approaches the managers have. The authors explored different Lean tools and methods both separately and combined and noticed that to gain as much as possible from Lean tools and methods are most effective when combined to an approach. Although some Lean tools in goods receiving affect the value flow in a positive matter some would probably not. Due to the uneven flow of incoming shipments JIT was not seen appropriate to implement unless shipments could be assured to arrive as planned, when needed and with correct amount of goods.Conclusions &amp; recommendations – By the study findings the authors were able to base two conclusions:1. To take full advantage of Lean tools and methods in goods receiving, these are best to be bundled together to an approach that is in accordance with the Lean philosophy at the organization.2. Good and competent leadership in the Lean philosophy is crucial to ensure continuous improvements in the organization.3. A Lean philosophy adapted in goods receiving is likely to ensure stability and reliability across the value stream which makes improvements possible and might lead to improved value stream performance.Based on these conclusions the authors recommend that when implementing or working with Lean managers should practice participatory leadership to ensure the commitment of workers, to lead by example and to get the correct current state view. It is also recommended that when implementing Lean tools in to the goods receiving process the holistic view is of high importance.

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