Dissertations / Theses: 'Two-level design'

1

Katsaounis, Parthena I. "Equivalence of symmetric factorial designs and characterization and ranking of two-level Split-lot designs." The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1164176825.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Siddiqui, Sauleh Ahmad. "Solving two-level optimization problems with applications to robust design and energy markets." UNIVERSITY OF MARYLAND, COLLEGE PARK, 2012. http://pqdtopen.proquest.com/#viewpdf?dispub=3495412.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Wang, Xiaodan. "The EMI Filter Design for GaN HEMT Based Two-Level Voltage Source Inverter." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu152424286628544.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Mays, Darcy P. "Design and analysis for a two level factorial experiment in the presence of dispersion effects." Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/39723.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Studenny-Marquez, Sandra. "An analysis of two year interior design programs: Meeting the criteria for entry level employment and established industry standards." CSUSB ScholarWorks, 1997. https://scholarworks.lib.csusb.edu/etd-project/1317.

Full text

Abstract:

The purpose of this study of two year interior design programs will be to assess the effectiveness of the programs in meeting the established industry requirements for entry-level positions of employment.

APA, Harvard, Vancouver, ISO, and other styles

6

Hiner, Stephen W. "Analyses of Two Aspects of Study Design for Bioassessment With Benthic Macroinvertebrates: Single Versus Multiple Habitat Sampling and Taxonomic Identification Level." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/9716.

Full text

Abstract:

Bioassessment is the concept of evaluating the ecological condition of habitats by surveying the resident assemblages of living organisms. Conducting bioassessment with benthic macroinvertebrates is still evolving and continues to be refined. There are strongly divided opinions about study design, sampling methods, laboratory analyses, and data analysis. Two issues that are currently being debated about study design for bioassessment in streams were examined here: 1) what habitats within streams should be sampled; 2) and is it necessary to identify organisms to the species level? The influence of habitat sampling design and level of taxonomic identification on the interpretation of ecological conditions of ten small streams in western Virginia was examined. Cattle watering and grazing heavily affected five of these streams (impaired sites). The other five streams, with no recent cattle activity or other impact by man, were considered to be reference sites because they were minimally impaired and represented best attainable conditions. Inferential and non-inferential statistical analyses concluded that multiple habitat sampling design was more effective than a single habitat design (riffle only) at distinguishing impaired conditions, regardless of taxonomic level. It appeared that sampling design (riffle habitat versus multiple habitats) is more important than taxonomic identification level for distinguishing reference and impaired ecological conditions in this bioassessment study. All levels of taxonomic resolution, which were studied, showed that the macroinvertebrate assemblages at the reference and impaired sites were very different and the assemblages at the impaired sites were adversely affected by perturbation. This study supported the sampling of multiple habitats and identification to the family level as a design for best determining the ecological condition of streams in bioassessment.
Master of Science

APA, Harvard, Vancouver, ISO, and other styles

7

Zhang, Ruiyang. "Cache Design for Massive Heterogeneous Data of Mobile Social Media." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-175759.

Full text

Abstract:

Since social media gains ever increasing popularity, Online Social Networks have become important repositories for information retrieval. The concept of social search, therefore, is gradually being recognized as the next breakthrough in this field, and it is expected to dominate topics in industry. However, retrieving information from OSNs with high Quality of Experience is non-trivial as a result of the prevalence of mobile applications for social networking services. For the sake of shortening user perceived latency Web caching was introduced and has been studied extensively for years. Nevertheless, the previous works seldom focus on the Web caching solutions for social search. In the context of this master’s thesis project, emphasis is given to the design of a Web caching system which is used to cache public data from social media with the objective of improving the user experience in terms of the freshness of data and the perceived service latency. To be more specific, a Web caching strategy named Staleness Bounded LRU algorithm is proposed to limit the term of validity of the cached data. In addition, a Two-Level Web Caching System that adopts the SB-LRU algorithm is proposed in order for shortening the user perceived latency. Results of trace-driven simulations and performance evaluations demonstrate that serving clients with stale data is avoided and the user perceived latencies are significantly shortened when the proposed Web caching system is used in the use case of unauthenticated social search. Besides, the design idea in this project is believed to be helpful to the design of a Web caching system for social search, which is capable of caching user specific data for different clients.

APA, Harvard, Vancouver, ISO, and other styles

8

Englund, Sofia. "Optimizing the design of two-stage ditches to improve nutrient and sediment retention." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-415420.

Full text

Abstract:

Negative effects on water quality are created by eutrophication of the world’s water resources. Mitigation measures have been implemented, but poor improvements in water quality have been observed. Two-stage ditches have the possibility to increase nutrient and sediment retention to reduce eutrophication in receiving water bodies. A two-stage ditch has floodplain terraces on each side of the ordinary main channel. The terraces are available for flooding during high water flows and enables decreases in flow velocities. However, more knowledge is needed about the two-stage ditch and its effect in Swedish landscapes. The aim of the project was to study the two-stage ditch design with focus on water retention. Optimization of the two-stage ditch design was made by modeling and simulating design parameters and vegetation in the software Hydrologic Engineering Center’s River Analysis System (HEC-RAS). An existing two-stage ditch in Sweden was used as base and comparison to the theoretical model. In addition, a climate change scenario was studied to evaluate the impact of increased storm events in a two-stage ditch. Results showed that increased retention time of water, nutrients, and sediments theoretically can be given by designing two-stage ditches with maximum terrace width and minimum terrace height, and with terraces angled away from the main channel. Vegetation should also be kept on both terraces and in the main channel of the two-stage ditch to increase retention time. The study also showed that the two-stage ditch design has the possibility to decrease peak water levels during storm events, which can be expected to increase in the future. The impact on transport of nutrients and sediments from more future extreme hydrological events needs further studies.
Negativa effekter i vattenkvalitet skapas av övergödning i världens vattenresurser. Åtgärder för att begränsa övergödningen har genomförts, men svaga förbättringar i vattenkvalitet har noterats. Tvåstegsdiken har möjligheten att öka retentionen av näringsämnen och sediment för att minska övergödning. Ett tvåstegsdike har terrasser på vardera sida om den vanliga mittfåran. Terrasserna är tillgängliga för översvämning vid höga vattenflöden, vilket möjliggör minskning av flödeshastigheter. Dock krävs mer kunskap för tvåstegsdiken och dess effekt i svenska landskap. Syftet med projektet var att studera designen av tvåstegsdiken med fokus på retention av vattenflöde. Optimering av tvåstegsdikens design genomfördes via modellering och simulering av designparametrar och vegetation i programvaran Hydrologic Engineering Center’s River Analysis System (HEC-RAS). Ett befintligt tvåstegsdike i Sverige användes som bas och jämförelse mot den teoretiska modellen. Ett scenario för klimatförändring studerades även för att utvärdera effekten i ett tvåstegsdike då fler stormevent sker. Resultaten visade att ökad retentionstid for vatten, näringsämnen, och sediment teoretiskt kan ges genom att designa tvåstegsdiken med maximal terrassbredd och minimal terrasshöjd, samt med terrasser vinklade bort från mittfåran. Vegetation bör även behållas på terrasser och i mittfåran av tvåstegsdiket för att öka retentionstiden. Studien visade även att tvåstegs- dikets design har möjligheten att minska toppflöden vid stormevent, vilka kan förväntas öka i framtiden. Påverkan på transport av näringsämnen och sediment från fler framtida extrema hydrologiska event kräver ytterligare studier.

APA, Harvard, Vancouver, ISO, and other styles

9

Ramos, Victorino Morales. "Construction of two-level fractional factorial designs." Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438410.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Bailey, Brittney E. "Data analysis and multiple imputation for two-level nested designs." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531822703002162.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Naußed, David, and Ruta Sapokaite. "Evaluation of Procedural Content Generators for Two-Dimensional Top-Down Dungeon Levels." Thesis, Uppsala universitet, Institutionen för speldesign, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-446471.

Full text

Abstract:

This research evaluates two-dimensional top-down dungeon generated levels regarding fundamental and micro dungeon design patterns. Additionally, it investigates the meaningfulness of the evaluation results in terms of accessibility to level designers and similar. The research method concentrates on two dungeon-generation techniques – Cellular Automata and Drunkard Walk. Each generated level gets evaluated based on three evaluation stages that build on top of each other: the passability of each tile; categorization of each collection of tiles with the same attributes; and player-centric gameplay data. The results show key differences between Cellular Automata and Drunkard Walk as the risk of using Cellular Automata to generate up to 90% unreachable space, while drunkard walk always has a playable relative space size of 100%. The evaluation also shows results that depend on the requirements of a game or constraints of a level designer. Cellular Automata generates more rooms, while Drunkard Walk provides more decisions per room. In conclusion, the evaluation results show differences between the two algorithms, presented using a vocabulary that is familiar to a level designer.

APA, Harvard, Vancouver, ISO, and other styles

12

Shropshire, Kevin O'Neil. "Impact of Ignoring Nested Data Structures on Ability Estimation." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/64197.

Full text

Abstract:

The literature is clear that intentional or unintentional clustering of data elements typically results in the inflation of the estimated standard error of fixed parameter estimates. This study is unique in that it examines the impact of multilevel data structures on subject ability which are random effect predictions known as empirical Bayes estimates in the one-parameter IRT / Rasch model. The literature on the impact of complex survey design on latent trait models is mixed and there is no "best practice" established regarding how to handle this situation. A simulation study was conducted to address two questions related to ability estimation. First, what impacts does design based clustering have with respect to desirable statistical properties when estimating subject ability with the one-parameter IRT / Rasch model? Second, since empirical Bayes estimators have shrinkage properties, what impacts does clustering of first-stage sampling units have on measurement validity-does the first-stage sampling unit impact the ability estimate, and if so, is this desirable and equitable? Two models were fit to a factorial experimental design where the data were simulated over various conditions. The first model Rasch model formulated as a HGLM ignores the sample design (incorrect model) while the second incorporates a first-stage sampling unit (correct model). Study findings generally showed that the two models were comparable with respect to desirable statistical properties under a majority of the replicated conditions-more measurement error in ability estimation is found when the intra-class correlation is high and the item pool is small. In practice this is the exception rather than the norm. However, it was found that the empirical Bayes estimates were dependent upon the first-stage sampling unit raising the issue of equity and fairness in educational decision making. A real-world complex survey design with binary outcome data was also fit with both models. Analysis of the data supported the simulation design results which lead to the conclusion that modeling binary Rasch data may resort to a policy tradeoff between desirable statistical properties and measurement validity.
Ph. D.

APA, Harvard, Vancouver, ISO, and other styles

13

El, Khoury John. "Accounting for Risk and Level of Service in the Design of Passing Sight Distances." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29805.

Full text

Abstract:

Current design methods in transportation engineering do not simultaneously address the levels of risk and service associated with the design and use of various highway geometric elements. Passing sight distance (PSD) is an example of a geometric element designed with no risk measures. PSD is provided to ensure the safety of passing maneuvers on two-lane roads. Many variables decide the minimum length required for a safe passing maneuver. These are random variables and represent a wide range of human and vehicle characteristics. Also, current PSD design practices replace these random variables by single-value means in the calculation process, disregarding their inherent variations. The research focuses on three main objectives. The first goal is to derive a PSD distribution that accounts for the variations in the contributing parameters. Two models are devised for this purpose, a Monte-Carlo simulation model and a closed form analytical estimation model. The results of both models verify each other and differ by less than 5 percent. Using the PSD distribution, the reliability index of the current PSD criteria are assessed. The second goal is to attach risk indices to the various PSD lengths of the obtained distribution. A unique microscopic simulation is devised to replicate passing maneuvers on two-lane roads. Using the simulation results, the author is able to assess the risk of various PSD lengths for a specific design speed. The risk index of the AASHTO Green Book and the MUTCD PSD standards are also obtained using simulation. With risk measures attached to the PSD lengths, a trade-off analysis between the level of service and risk is feasible to accomplish. The last task is concerned with applying the Highway Capacity Manual concepts to assessing the service measures of the different PSD lengths. The results of the final trade-off analysis show that for a design speed of 50 mph, the AASHTO Green Book and the MUTCD standards overestimate the PSD requirements. The criteria can be reduced to 725 ft and still be within an acceptable risk level.
Ph. D.

APA, Harvard, Vancouver, ISO, and other styles

14

Ніжевський, Ілля Вікторович. "Удосконалення методів модернізації і контролю параметрів заземлювального пристрою міських підстанцій." Thesis, НТУ "ХПІ", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/32565.

Full text

Abstract:

Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.14.02 – електричні станції, мережі і системи. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2017. Дисертація присвячена актуальній науково-практичної проблеми пошуку і розробки нових способів для вимірювання опору ЗП, розробки нових конструкцій ЗП, що дозволяють спростити реконструкцію ПС, а також створення і вдосконалення математичних моделей і програм для розрахунку електричних характеристик ЗП довільних конструкцій. Аналіз результатів обстеження існуючих ЗП ПС, виявив серйозні порушення, які призводять до відхилення параметрів від норми і до необхідності модернізації ЗП ПС. Показано, що модернізація ЗП призводить до відновлення його нормованих параметрів. Розроблено математичні моделі ЗП простих дворівневих конструкцій з горизонтальних або кільцевих електродів. В результаті дослідження електричного поля виявлено, що потенціал на поверхні землі над центром квадратного заземлювача може бути вище, ніж над електродом. Удосконалено математичну модель складного дворівневого ЗП ПС, розроблений метод розрахунку його електричних характеристик. Проведено дослідження впливу глибини закладення сітки верхнього рівня ЗП ПС, товщини шару зволоження, просихання або промерзання ґрунту і конструкції ЗП на його електричні характеристики. Виконано теоретичне обґрунтування методу та розроблено спосіб вимірювання опору ЗП ПС в умовах щільної забудови території. Метод застосуємо при будь-якому характері неоднорідності ґрунту, будь-яких розмірах і конфігурації ЗП і довільному розміщенні вимірювальних електродів без відшукання точки нульового потенціалу. Експериментально досліджені електричні характеристики дворівневого ЗП ПС методом фізичного моделювання в електролітичній ванні. Отримані результати показали хороший збіг з результатами розрахунків.
Dissertation for the degree of Ph.D., specialty 05.14.02 – power stations, networks and systems. – National Technical University "Kharkiv Polytechnic Institute", Kharkov, 2017. The dissertation is devoted to the actual and practical problem of search and development of new methods for measurement of resistance of the grounding devices; developments of new designs of the grounding devices allowing to simplify reconstruction of substations; creation and enhancement of mathematical models and programs for calculation of electric characteristics of the grounding devices of any designs. The analysis of the results of the inspection of existing grounding devices of substations revealed serious violations that lead to deviation of parameters from the norm and to the need for modernization of grounding devices of substations. It is shown that the modernization of grounding devices leads to the restoration of its normalized parameters. Mathematical models of grounding devices of simple two-level structures of horizontal or ring electrodes are developed. As a result of the investigation of the electric field, it is revealed that the potential on the surface of the ground above the center of the square grounding electrode can be higher than above the electrode. The mathematical model of complex two-level grounding devices of substations is enhanced. The method of its electrical characteristics calculating is developed. The influence of the depth of the grid of the upper level of the grounding devices of the substations, the thickness of the humidification layer, the drying or freezing of the soil and the design of the grounding devices on its electrical characteristics was studied. Based on the theoretical substantiation of the method, a technique for measuring the resistance of grounding devices of substations in conditions of dense building of the territory is developed. The method is applicable for any kind of ground heterogeneity, any size and configuration of grounding devices and arbitrary placement of measuring electrodes without finding a zero potential point. Electric characteristics two-level the grounding devices of substations are experimentally researched by method of physical modeling in an electrolytic bathtub. The received results showed good coincidence to results of calculations.

APA, Harvard, Vancouver, ISO, and other styles

15

Ніжевський, Ілля Вікторович. "Удосконалення методів модернізації і контролю параметрів заземлювального пристрою міських підстанцій." Thesis, НТУ "ХПІ", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/32563.

Full text

Abstract:

Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.14.02 – електричні станції, мережі і системи. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2017. Дисертація присвячена актуальній науково-практичної проблеми пошуку і розробки нових способів для вимірювання опору ЗП, розробки нових конструкцій ЗП, що дозволяють спростити реконструкцію ПС, а також створення і вдосконалення математичних моделей і програм для розрахунку електричних характеристик ЗП довільних конструкцій. Аналіз результатів обстеження існуючих ЗП ПС, виявив серйозні порушення, які призводять до відхилення параметрів від норми і до необхідності модернізації ЗП ПС. Показано, що модернізація ЗП призводить до відновлення його нормованих параметрів. Розроблено математичні моделі ЗП простих дворівневих конструкцій з горизонтальних або кільцевих електродів. В результаті дослідження електричного поля виявлено, що потенціал на поверхні землі над центром квадратного заземлювача може бути вище, ніж над електродом. Удосконалено математичну модель складного дворівневого ЗП ПС, розроблений метод розрахунку його електричних характеристик. Проведено дослідження впливу глибини закладення сітки верхнього рівня ЗП ПС, товщини шару зволоження, просихання або промерзання ґрунту і конструкції ЗП на його електричні характеристики. Виконано теоретичне обґрунтування методу та розроблено спосіб вимірювання опору ЗП ПС в умовах щільної забудови території. Метод застосуємо при будь-якому характері неоднорідності ґрунту, будь-яких розмірах і конфігурації ЗП і довільному розміщенні вимірювальних електродів без відшукання точки нульового потенціалу. Експериментально досліджені електричні характеристики дворівневого ЗП ПС методом фізичного моделювання в електролітичній ванні. Отримані результати показали хороший збіг з результатами розрахунків.
Dissertation for the degree of Ph.D., specialty 05.14.02 – power stations, networks and systems. – National Technical University "Kharkiv Polytechnic Institute", Kharkov, 2017. The dissertation is devoted to the actual and practical problem of search and development of new methods for measurement of resistance of the grounding devices; developments of new designs of the grounding devices allowing to simplify reconstruction of substations; creation and enhancement of mathematical models and programs for calculation of electric characteristics of the grounding devices of any designs. The analysis of the results of the inspection of existing grounding devices of substations revealed serious violations that lead to deviation of parameters from the norm and to the need for modernization of grounding devices of substations. It is shown that the modernization of grounding devices leads to the restoration of its normalized parameters. Mathematical models of grounding devices of simple two-level structures of horizontal or ring electrodes are developed. As a result of the investigation of the electric field, it is revealed that the potential on the surface of the ground above the center of the square grounding electrode can be higher than above the electrode. The mathematical model of complex two-level grounding devices of substations is enhanced. The method of its electrical characteristics calculating is developed. The influence of the depth of the grid of the upper level of the grounding devices of the substations, the thickness of the humidification layer, the drying or freezing of the soil and the design of the grounding devices on its electrical characteristics was studied. Based on the theoretical substantiation of the method, a technique for measuring the resistance of grounding devices of substations in conditions of dense building of the territory is developed. The method is applicable for any kind of ground heterogeneity, any size and configuration of grounding devices and arbitrary placement of measuring electrodes without finding a zero potential point. Electric characteristics two-level the grounding devices of substations are experimentally researched by method of physical modeling in an electrolytic bathtub. The received results showed good coincidence to results of calculations.

APA, Harvard, Vancouver, ISO, and other styles

16

Yilmaz, Taner. "Seismic Response Of Multi-span Highway Bridges With Two-column Reinforced Concrete Bents Including Foundation And Column Flexibility." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12610191/index.pdf.

Full text

Abstract:

Seismic design of highway bridges has improved as a result of the experience gained from large earthquakes of the last thirty years. Ductility demand and reserved capacity are extremely important response measures used in new bridge designs to assess target damage levels. However, the application of practical design approaches specified in bridge design codes is not well-defined for bridges over flexible foundations. Within the scope of this research, thirty two bridge models having varying column aspect ratio, amount of column longitudinal reinforcement and foundation flexibility parameters are investigated through a series of analyses such as response spectrum analysis and inelastic time-history analysis under &ldquo
safety evaluation earthquake&rdquo
hazard level with a return period of 1000 years, and push-over analysis. Using the results of analyses, seismic response of the investigated bridges are identified with several measures such as displacement capacity over demand ratio, global displacement ductility demand, and response modification factor, along with maximum concrete and steel strains of columns. A correlation between concrete and steel strains and seismic response measure values is constructed to estimate damage levels with commonly used response measures. The findings of this research revealed that global displacement ductility demand is not a favorable response measure for assessing damage levels. On the other hand, displacement capacity over demand ratios can be suggested for estimation of damage levels especially where foundation flexibility effects are extensive as system yielding is not taken into consideration.

APA, Harvard, Vancouver, ISO, and other styles

17

Chuang, Po-Yuan, and 莊博淵. "Intelligent Two-Level Mnltimachine System Controller Design." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/42046978461598644895.

Full text

Abstract:

碩士
國立臺北教育大學
資訊科學系碩士班
100
For avoiding the situation that internal electricity demanded increasing, due to the construct of power system is more complex, and difficult to avoid the accident happen or system failure, How to obviate the unstability of system caused by the changes of voltage or load is the first important problem of controlling the stability of power system. This thesis proposes a new approach-Variable Structure Grey system theory and fuzzy Control to design a new Intelligence Stabilizer of Multimachine power system; But that increases the implementation and reduces the reliability of control system. To deal with this problem, we use the optimal reduced models to reduce the power system model into two state variables system by each generator and use Variable Structure Grey Control to find control signal of each generator. Moreover, we will apply Genetic Algorithms (GA) to find the appropriate parameter values for the desired system. Finally, the advantages of the proposed method are illustrated by numerical simulation of the two machines-infinite-bus power system.

APA, Harvard, Vancouver, ISO, and other styles

18

ZHAO, SHI-JIN, and 趙時進. "Two-level pipeline design for image resampling." Thesis, 1988. http://ndltd.ncl.edu.tw/handle/49614076541635135168.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Wang, Yao-Qing, and 王耀慶. "Design of two-level main memory hierarchy." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/50207808472045120122.

Full text

Abstract:

碩士
國立臺灣大學
資訊工程學研究所
101
3D stacked DRAM is a promising technology in manufacturing integrated circuits. It can make circuit component denser. Besides, it can provide faster memory access response time and higher bandwidth. And as main memory size enlarges, DRAM cache design is a good way to be applied by 3D stacked DRAM, which can cache data in 3D stacked DRAM and utilize the performance benefits of 3D stacked DRAM. We develop two full system simulators, one for multi-core environment and the other for mobile device, to analysis the performance and memory system power consumption of 3D stacked DRAM cache architecture. We model the 3D DRAM`s timing and power characteristics including TSV transmission power. Moreover, LPDDR2 is also modeled in mobile device environment. We change the design factors of DRAM cache, like channel width, total TSV number, channel number and DRAM cache line size, to observe the system and analyze what design is better to 3D stacked DRAM cache architecture.

APA, Harvard, Vancouver, ISO, and other styles

20

Yin, Yue. "A-optimal Minimax Design Criterion for Two-level Fractional Factorial Designs." Thesis, 2013. http://hdl.handle.net/1828/4865.

Full text

Abstract:

In this thesis we introduce and study an A-optimal minimax design criterion for two-level fractional factorial designs, which can be used to estimate a linear model with main effects and some interactions. The resulting designs are called A-optimal minimax designs, and they are robust against the misspecification of the terms in the linear model. They are also efficient, and often they are the same as A-optimal and D-optimal designs. Various theoretical results about A-optimal minimax designs are derived. A couple of search algorithms including a simulated annealing algorithm are discussed to search for optimal designs, and many interesting examples are presented in the thesis.
Graduate
0463
yinyue@uvic.ca

APA, Harvard, Vancouver, ISO, and other styles

21

Huang, Yi Fan, and 黃詒璠. "Two-Level Factorial Design in Blocks of Size Four." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/87738980993985182763.

Full text

Abstract:

碩士
長庚大學
工商管理學系
99
When arranging an experiment, experimenters may encounter time, equipment, personnel or other constraints. To exclude effect from concerned constraints, the block design is usually used. If the experiment can only be executed in four runs at one time, however, we want to know some interesting factor effects, it is necessary to design the experiment in blocks of size four. This study is mainly to arrange two-level experiment in blocks of size four. Because all main effects and second-order interactions cannot be estimated by using one factorial experiment in blocks of size four, we have found the number of replicates for 2^2 to 2^9 full factorial experiments to estimate all main effects and two-way interactions. For 2^10 to 2^18 full experiments, we use Huang (2009)’s combination method to generate the design. Finally we explore the FFD (Fractional Factorial Design) method for experiments of four to nine factors in blocks of size four to reduce the number of runs of experiments.

APA, Harvard, Vancouver, ISO, and other styles

22

趙廷睿. "Two-level VOIP Gatekeeper Design with Geographical Location Consideration." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/74521526633633672643.

Full text

Abstract:

碩士
南台科技大學
電子工程系
92
This paper proposes a hierarchical Gatekeeper architecture by that users can define their own functions and protocols. It utilizes Python library to record geometrical data such as country , area , and IDNUM(similar to telephone number) . This gatekeeper architecture is devised to increase searching speed and not waste resources. The local gatekeeper of the proposed architecture can detect the connection of network continuously to resolve virtual IP problems. Moreover, by utilizing AES one can encrypt the TCP/IP packets securely so that computer intrusion by hackers can be prevented .

APA, Harvard, Vancouver, ISO, and other styles

23

ZHANG, YUAN-XUN, and 張元勳. "Two-level neural network system for learning controller design." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/71776171121031199350.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Kuo, Liang-Yu, and 郭良宇. "A two-level cache design for multi-core system." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/33851376165422626089.

Full text

Abstract:

碩士
國立成功大學
電腦與通信工程研究所
97
While the requirement of computing power becomes larger and larger, multi-core systems have recently become the most appropriate architecture to solve this problem because improving the performance of a single core system has run into a bottleneck. Cache memories play an important role in a shared-memory multi-core system since using private cache needs to ensure the consistence of shared data through coherence protocol. A two-level cache system for Symphony32 which is an ARM-like superscalar processor with 9-stage pipeline is implemented in this study. In our design, the L2 cache is treated as a shared cache, and reduces the traffics on system bus by 49.56% on average. After analyzing the relationship between the interconnection and cache coherence protocol, a two-level cache design that enhances the performance of the cache and the interconnection is presented. To enhance the cache, a dual-ported data cache is used to improve the performance by 10.24%. Moreover, the width of data channel is increased as large as the line size of the cache for transferring the data between caches rapidly, and this improves the performance of data accessing by 8.59%.

APA, Harvard, Vancouver, ISO, and other styles

25

Lin, Yi-Wei, and 林益瑋. "The Design and Applications of Two-Level Parallel Manipulators." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/33560849408093632112.

Full text

Abstract:

碩士
國立臺灣科技大學
機械工程系
96
Robot legs can be developed using serial or parallel kinematic chains. The legs with serial chains have simpler structure, better dexterity and larger workspace. The legs with parallel chains, on the other hand, have high accuracy, force/torque capacity, and structural rigidity. This work presents a new type of leg which consists of two serial- connected parallel chains. The direct kinematics, inverse kinematics and the Jacobian of the presented design are studied and then employed to search for the link parameters to generate a desired singularity-free workspace. Next, methods to manipulate the leg are proposed, and computer software is utilized for motion simulation. A real model is built for verification.

APA, Harvard, Vancouver, ISO, and other styles

26

Li, Zhao Ji, and 李昭冀. "Neural fuzzy controller design with two-level neural network." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/58558698163485044944.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Yeh, Chia Lin, and 葉佳霖. "Research on Optimal Sequence of Two-level Blocked Factorial Design." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/14663725525257149670.

Full text

Abstract:

碩士
長庚大學
工商管理學系
99
Blocked factorial experiments are considered for eliminating the Systematic sources of variations, such as the time and environment in factorial designs. Traditionally the higher-order interaction effects are used to be confounded with block effects. However, when the block size is small, we do not have enough high-order interaction effect for each purpose. Thus we need to carry out some blocks to estimate the treatment effects of interest. This article focuses on blocking designs of two levels, and take the optimal blocking sequence by Jacroux (2006) proposed, we first find out the advantage of using orthogonal arrays to arrange this kind of experiments. We provide a fixed assigning rule to obtain the optimal blocking sequence for full factorial designs in orthogonal arrays and a catalogue to obtain the optimal blocking sequence for fractional factorial designs when the run size less than 32.

APA, Harvard, Vancouver, ISO, and other styles

28

Wang, Jia-Long, and 王嘉隆. "Logical Design Method of Two Level Database in Data Warehouse." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/68702394062273277042.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Wong, Noreen Nga-Yee. "Design of a Two-Stage Level-Two Bidirectional On-Board Battery Charger for Plugin Vehicles." Thesis, 2013. http://hdl.handle.net/10012/7245.

Full text

Abstract:

Depletion of fossil fuel reserves, increasing awareness of air pollution levels and continuous rise in gasoline prices are some of the major drives that have been revolutionizing the automotive industry since the last decade. These factors combined are causing conventional automobiles with internal combustion engines (ICE) to be replaced with plugin vehicles. The on-board rechargeable battery packs in plugin vehicles can be recharged by connecting to the utility grid using a plug. The energy stored in the on-board battery packs has attractive benefits for grid support, and this promotes the idea of Vehicle-to-Grid (V2G). V2G power transactions allow energy from the on-board battery packs to be sent back to the utility grid for support in peak shaving and provide reactive power compensation. One natural consequence that arises with the introduction of V2G is a sharp increase in the need for high-performance power electronic interface between the utility grid and the battery pack. Therefore, research on bidirectional battery chargers for plugin vehicles is imperative in order to aid in the promotion of V2G. This thesis focuses on the design and development in a two-stage level-two on-board bidirectional battery charger.

APA, Harvard, Vancouver, ISO, and other styles

30

Lei, Hsien-Chung, and 雷憲忠. "Distribution Systems Design︰A Warehouse Location with Two-Level Routing Problem." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/78542322261954216581.

Full text

Abstract:

碩士
國立嘉義大學
運輸與物流工程研究所
94
We formulate and analyze a strategic design model for three-echelon distribution systems. The key design decisions considered are: the number and locations of distribution centers (DC’s), and the first-level routing between plants, DC’s and big clients, which big clients should include in the first level routing, the second-level routing between DC’s and other clients not including in the first-level routing. A hybrid genetic algorithm embedded with a routing heuristic is developed that can efficiently find near-optimal solutions. The quality of solution to a series of small test problems is evaluated – by comparison to the optimal solution solved by Lingo 9.0. In test problems for which exact solutions are available, the heuristic solution is within 1% of optimal. At last, the model is applied to design a national finished goods distribution system for a Taiwan label-stock manufacturer. Through the case study, we find that the inclusion of big clients in the first-level routing in the analysis leads to a better network design in terms of total logistic costs.

APA, Harvard, Vancouver, ISO, and other styles

31

Huang, Yi-Jia, and 黃奕嘉. "Design of Engine Mounting System Using A Two-level Optimization Method." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/20147588773928615660.

Full text

Abstract:

碩士
國立交通大學
機械工程學系
101
The purpose of this thesis is to establish a two-level optimization method that can be used for the design of an engine mounting system. In the proposed method, we build a vibration model of the engine mounting system using the basic vibration principles to study the vibration behavior of the system. The modal energies together with the coupling coefficients of the six degrees of freedom of the system are identified. A two-level optimization technique is then established to solve two types of optimal design problems for the engine mount system. The first type is about the design of the locations and spring constants of the mounts to make the TRA (torque roll axis) and EA (elastic axis) of the engine mounting system coincide. The effects of the coincidence of the TRA and EA on the force transmissibility and decoupling of the modal energies of the optimally designed system are studied. The other type is about the design of the locations and spring constants of the mounts to minimize the reaction force at the rear mount which is closer to the steering wheel. It has been shown that the second type of optimization problem can produce more useful results for reducing the transmissibility of vibration from engine to steering wheel.

APA, Harvard, Vancouver, ISO, and other styles

32

Shau, Ming-Luen, and 邵明倫. "Digital Circuit Design and Application for Two-Level Fuzzy Control System." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/65815441989851747287.

Full text

Abstract:

碩士
華梵大學
電子工程學系碩士班
97
Learning of the fuzzy system rule base is an important research topic. One of the research areas is to use the expert data for the learning of rule base. However, the output of the learned fuzzy system from the expert data will exist some approximation error when compared with the expert data. Hence, how to increase the accuracy of the learned fuzzy system is an important research field for development of learning algorithm. In this thesis, we first apply the look-up table technique to construct the consequent part of the fuzzy system. In order to increase the accuracy, we further use the learning error as a new set of training data to construct the second layer fuzzy system. The whole learning system is called two-level fuzzy system. This approach will utilize the same expert data for the second layer learning which can maintain the efficiency of the learning algorithm and improve the learning accuracy. The technique will be suitable for the problem without enough training information. In addition, the fuzzy learning algorithm is implemented in an FPGA chip. Since the two-level fuzzy learning system is very complicated with many repeated operations, an important feature of the proposed digital circuit is to use the same circuit for the repeated operations. Finally, we implement the two-level fuzzy system in an FPGA chip with the application to a car control example. This experiment is realized in an Altera’s Excalibur EPXA1 development board combined with the NI DIO card. The experiment results are shown by Matlab. Compared with the simulation results, the experiment results show that the proposed digital circuit is feasible and correct.

APA, Harvard, Vancouver, ISO, and other styles

33

ZHANG, JI-PING, and 張基平. "The optimal design parameter in the two-level symmetric hierarchical structure." Thesis, 1987. http://ndltd.ncl.edu.tw/handle/93398856546014562754.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Chen, Li-Jie, and 陳立傑. "Design and Application of Two Level Fuzzy Controller for DC Motors." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/89150181606367355267.

Full text

Abstract:

碩士
華梵大學
電子工程學系碩士班
98
In this thesis, we propose a position control structure of DC motor using a two level fuzzy controller which is realized as a digital circuit and implemented on an FPGA chip. The design and application of fuzzy controller have been widely studied for many years and achieved a lot of successful application examples. However, there are still some design difficulties for applying traditional fuzzy controller so that many improved approaches have been proposed. One of the strategies is the design by using two level fuzzy controllers. Although a lot of works have studied the theory and application of two level fuzzy controllers in the past decade, there was little research dealing with its digital circuit design. In this thesis, we not only aim to study the theory of two level fuzzy controller, but also design its digital circuit structure for application to the position control of DC motors. Furthermore, we also investigate the design of peripheral circuit for DC motor control, including the feedback circuit and driving circuit. In order to demonstrate the correctness and efficiency of the proposed two level fuzzy controller circuit, we used the VHDL code to design the two level fuzzy controller circuit. The circuit is synthesized by using Xilinx ISE and then downloaded into a Xilinx spartan3 FPGA chip and it applied to the position tracking control of DC motors. According to the experimental results, we prove that the digital circuit of the proposed two level fuzzy controller is correct and feasible.

APA, Harvard, Vancouver, ISO, and other styles

35

Ju-Lin, Lee, and 李儒霖. "Two-level Power System Stabilizer Design via Genetic Algorithm and Sliding Mode Control." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/33825063969391375443.

Full text

Abstract:

碩士
淡江大學
電機工程學系碩士在職專班
91
This thesis proposes a new approach for genetic algorithm and sliding mode control to design the power system stabilizers (PSS). The design of a PSS can be formulated as an optimal linear regulator control problem. However, implementing this technique requires the design of estimators. This increases the implementation and reduces the reliability of control system. These reasons, therefore, favor a control scheme that uses only output state variables, such as torque angle and speed. To deal with this problem, we use the optimal reduced order models to reduce the power system model into two state variables system for each generator. We use the genetic algorithm to find the switching surface vector and switching control signals and use the sliding mode control to find the control signal of the generator. The advantages of the proposed method are illustrated by numerical simulation of the one machines -infinite-bus power systems and two machines-infinite-bus power systems.

APA, Harvard, Vancouver, ISO, and other styles

36

Wu, Tai-Ling, and 吳岱凌. "The Application of Two-Level Interaction Mode in Parent-child Reading Furniture Design." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/73w35b.

Full text

Abstract:

碩士
國立臺北科技大學
創新設計研究所
102
At present time, in view of young children’s declining reading ability, there is a need to create conducive environment that nurtures good reading habits. A vital part of such an environment is the guardian’s role as a reading companion, to promote the child’s ability and interest to read. However, existing researches concerning child’s reading ability has not examined the interrelationship among the guardian, the child, the environment and furniture set up for parent-child reading. This research thus proposes a Two-level Interaction Mode, in the hope to provide greater insight into the parent-child reading context, and identify what is required to set up a conducive parent-child reading environment. To test the application of Two-level Interaction Mode in designing for parent-child reading, this research was carried out in three stages: (1) application of the Two-level Interaction Mode in a parent-child reading experiment, which includes the observation of parent-child reading scenarios and applying Two-level Interaction Mode to analyze the experiment data; (2) application of the analyzed results in stage 1 to design parent-child reading furniture, followed by evaluation experiment of the designs developed; and (3) evaluation of the furniture design by man-machine-environment specialists, providing their critiques on the concept of Two-level Interaction Mode, the design context and the effectiveness in its application. Analysis from the parent-child reading scenarios shows that due to lack of enough free space and comfort in homes, most parent-child reading activities take place in the bedroom or living room. Because the sofa and bed are not designed for reading purpose, it is easy to exert pressure to the reader’s shoulder, neck, arms and legs, which might even affect the reader’s mind, causing accompanied-reading to become a source of pressure. Based on the above findings, four furniture designs were developed. Findings from the evaluation of the designs shows that when using the accompanied-reading furniture, the guardian tends to be affected by the form of the furniture, as well as the availability of a desk surface. The child, on the other hand, is more affected by the form of the furniture and the availability of an arm-rest. It is also found that enclosure of the furniture would increase the engagement interaction and nurturing interaction between parent and child. The evaluation of the Two-level Interaction Mode by the experts highlights that (1) the Two-level Interaction Mode could further focus on the subjects being observed, but as more research factors would be involved, more in-depth exploration would be needed to examine how the various factors influence one another; and (2) the application of Two-level Interaction Mode in designing for parent-child reading could produce a certain level of effectiveness. Future researches could aim towards development of the Three-Level Interaction Mode, to include other factors in its discussion, or to investigate multi-person interaction, to build a more complete man-machine-environment research.

APA, Harvard, Vancouver, ISO, and other styles

37

"Modeling and heuristic worst-case performance analysis of the two-level network design problem." Alfred P. Sloan School of Management, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/2442.

Full text

Abstract:

Anantaram Balakrishnan, Thomas L. Magnanti and Prakash Mirchandani.
"Revised: November 1992"--2nd prelim. p.
Includes bibliographical references.
Supported by a grant from the AT&T Research Fund. Supported by a Faculty Grant from the Katz Graduate School of Business, University of Pittsburgh.

APA, Harvard, Vancouver, ISO, and other styles

38

LIN, RUEILING, and 林瑞霖. "DESIGN AND ANALYSIS OF NEW PROGRAM MODES FOR TWO-LEVEL AND MULTILEVEL FLASH MEMORY." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/33276205014040603065.

Full text

Abstract:

碩士
國立清華大學
電機工程學系
85
Flash memories, one of electrically programmable nonvolatile memories, providea storage solution for applications demanding low power consumption, high density, nonvolatility and mobile computing. Multilevel flash memories have been found to be more important in very high density applications than in low density ones because multilevel flash memory halves the cost per bit which is further lowered at higher density. However, the number of failure bits resulting from defects and trapping or trap generation ofelectrons and holes in the oxide will increase as the chip size increases. Thus, to maintain the correct information, the threshold voltage should becontrolled precisely. To decrease the failure rate is a tough problem when more bits fail due to trap generation in oxide. The conventional "Constant voltage and incremental pulse width scheme" leads to low yield because of low charge-to-breakdown margin since the maximum programming current is not limited. A reliable constant current program is, as a result, a demanding technology to retain the charge-to-breakdown margin. This work focuses on reducing stress current on every bit, rather than on modifying dielecric materials or properties, to improve the reliability and diminish the varianceof threshold distribution while keeping fast operation speed. The two proposed methods using variable voltage and width pulses for word lines or bit lines to optimize stress conditions for each bit. We develop a new model extraction tool and a new array simulator to analyze the proposed two pulse schemes. First, the "Fixed Wordline and Variable Bitline Scheme: FWVB" uses increasing bitline voltage to perform programming. The maximum FN current less than 0.1A/mm is achieved to have the high program speed of 710ms per page. The charge-to-breakdown margin is increased, indicating a higher cycling endurance. Second, the "Multilevel Bitline with Variable Wordline Scheme: MBVW" aims at high reliable and high speed multilevel flash program. The multilevel level bitline voltages (4V for "11", 3.4V for "10", 2.8V for "01", and 0V for "00") further reduce the FN current and GIDL current for "01" and "10" programng while the variable word line voltage enables the constant FN current programming for faster and slower bits whichever "00", "01", "10" or "11" is to be programmed. The reliability and tight threshold distribution are retained simultaneously by using the proposed two programming schemes as compared to conventional programming schemes for ultra high density flash memories.

APA, Harvard, Vancouver, ISO, and other styles

39

Kuo, Hao Che, and 郭皓哲. "Design of 38 GHz Patch Antenna Array With Two-Dimensional Low Side-Lobe Level." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/eaphcm.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

HUANG, WEI-TAO, and 黃緯滔. "Optimization Technique Approach by Two-level Standbys Design on Fault Tolerance System for Cloud Logistics." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/76x3a4.

Full text

Abstract:

碩士
東海大學
資訊工程學系
104
On cloud platform, the computing resources are provided in an on-demand and dynamic fashion for the cloud customers via Internet. For improving system reliability and availability, the concept of fault tolerance is adopted to allow the cloud platform to maintain necessary quality of service even when some operational servers fail. The construction on the cloud logistics is mainly concerned with the deployment of standby servers. The goal of this research is to provide an effective decision support for cloud logistics to get around the selection on spares quantities in a haphazard way. The proposed novel design pattern is developed for approaching optimal cost on logistics using the two-level standbys scheme from finite-source queuing theory. The detailed system flow diagram is provided to grasp the whole system profile. To formulate the proposed approach, the mathematical analysis on cost pattern has been made quantitatively in detail. Relevant simulations have also been conducted to validate the proposed optimization model. The design illustration is presented to demonstrate engineering application scenario in cloud environment, hence the proposed two-level standbys approach indeed provides a feasibly cost-oriented framework to meet logistic economy.

APA, Harvard, Vancouver, ISO, and other styles

41

Chen, You-Da, and 陳佑達. "Design of an Active Gate Driver for IGBTs with Two-Level Turn-On and Turn-Off." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/86126133923903388995.

Full text

Abstract:

碩士
國立清華大學
電機工程學系
102
Traditionally, gate control of IGBTs could be a way to reduce switching losses and voltage overshoots by means of adding passive components such as snubbers in the circuits. While they are easy to implement and effective, additional part count and power losses make them less attractive. Previous studies focus on methods of changeable driving speed during switching process, with open-loop or close-loop controls, in order to lower di/dt and dv/dt. However, in some cases, the complexity of the control methodology makes them hard to implement for practical uses. The objective of this study is to design a gate driver circuit for insulated gate bipolar transistors (IGBTs) with functions such as two-level turn-on to reduce peak reverse recovery current when turning on the device, two-level turn-off to limit over-voltage when the device is turned off, and under-voltage lock out protection. Based on several requirements to achieve optimal switching performance for IGBTs under hard-switching conditions, principles and operations of the two-level gate control are explained. The improvements of current overshoot at turn-on, voltage overshoot at turn-off, and switching energy losses are measured and discussed. The proposed IC is realized using a foundry’s HV 0.25μm BCD technology. The die area of the IGBT gate driver IC is 2mm × 2mm. Both the simulation and experimental results show good agreement with the theoretical analysis.

APA, Harvard, Vancouver, ISO, and other styles

42

Li, Nong-Yi, and 李穠義. "Design and Implementation of Modulated Predictive Current Controllers for Three-Phase Four-Leg Two-Level Inverters." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/j4uksd.

Full text

Abstract:

碩士
國立臺灣海洋大學
電機工程學系
107
This thesis proposes a novel type of modulated model-free predictive current control for three-phase four-arm two-level inverters. Compared to traditional techniques, the proposed method effectively improves current response at high frequencies by incorporating the optimal selection of two switching states based on simple calculation and then combines to the next switching state. This selection method effectively detects the optimal two modulated switching states in each sampling period. In addition, the improved control response at high frequency effect is introduced using an enhanced updating mechanism of the current difference. This is to enable the switching states of alike phase voltage to update current difference amount at the same time. In order to verify the proposed method, the simulation is conducted using MATLAB/Simulink software, and implemented using the TMS320F28379D dual-core digital signal controller by Texas Instruments. The simulation and experimental results show that the proposed method can significantly improve the current tracking performance compared with the existing methods.

APA, Harvard, Vancouver, ISO, and other styles

43

Hu, Jyun-Wei, and 胡峻瑋. "Design and Implementation of Novel Predictive Current Controllers for a Three-Phase Two-Level Voltage Source Inverter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/81365713523009274314.

Full text

Abstract:

碩士
國立臺灣海洋大學
電機工程學系
104
This thesis proposes a novel model-free predictive current control for a three-phase two-level voltage source inverter. Unlike the predictive current control using seven voltage vectors, the proposed method uses 19 resultant voltage vectors, each of the vectors consisted of two voltage vectors. Since the numbers of available voltage vectors are increased from eight to nineteen, the predictive error can be effectively reduced. In addition, the proposed method does not require load parameters, back electromotive force, and system models. To compare to the model-based predictive current control, the proposed one belongs to a model-free approach because it is based on loading current detection, implying that the method is in sensitive to parameter variations. Finally, a TMS320F28335 digital signal controller, made by Texas Instruments Company, is used to validate the feasibility of the proposed method. From simulation and experimental results, there are better current-tracking performance in steady-state and transient responses than the existed predictive current control.

APA, Harvard, Vancouver, ISO, and other styles

44

"Analysis Methods for No-Confounding Screening Designs." Doctoral diss., 2020. http://hdl.handle.net/2286/R.I.63073.

Full text

Abstract:

abstract: Nonregular designs are a preferable alternative to regular resolution four designs because they avoid confounding two-factor interactions. As a result nonregular designs can estimate and identify a few active two-factor interactions. However, due to the sometimes complex alias structure of nonregular designs, standard screening strategies can fail to identify all active effects. In this research, two-level nonregular screening designs with orthogonal main effects will be discussed. By utilizing knowledge of the alias structure, a design based model selection process for analyzing nonregular designs is proposed. The Aliased Informed Model Selection (AIMS) strategy is a design specific approach that is compared to three generic model selection methods; stepwise regression, least absolute shrinkage and selection operator (LASSO), and the Dantzig selector. The AIMS approach substantially increases the power to detect active main effects and two-factor interactions versus the aforementioned generic methodologies. This research identifies design specific model spaces; sets of models with strong heredity, all estimable, and exhibit no model confounding. These spaces are then used in the AIMS method along with design specific aliasing rules for model selection decisions. Model spaces and alias rules are identified for three designs; 16-run no-confounding 6, 7, and 8-factor designs. The designs are demonstrated with several examples as well as simulations to show the AIMS superiority in model selection. A final piece of the research provides a method for augmenting no-confounding designs based on a model spaces and maximum average D-efficiency. Several augmented designs are provided for different situations. A final simulation with the augmented designs shows strong results for augmenting four additional runs if time and resources permit.
Dissertation/Thesis
Doctoral Dissertation Industrial Engineering 2020

APA, Harvard, Vancouver, ISO, and other styles

45

Sima, Said Athuman. "Integrated stochastic distribution network design: a two-level facility location problem with applications to maize crops transportation in Tanzania." Thesis, 2015. http://hdl.handle.net/10539/18589.

Full text

Abstract:

thesis submitted to the Faculty of Science in fulfilment of the requirements for the degree of Doctor of Philosophy. March 17, 2015.
A two-level facility location problem (FLP) arose in the transport network of maize crop in Tanzania has been studied. The three layers, namely, production centers (PCs), distribution centers (DCs) and customer points (CPs) are considered in the two-level FLP. The stochastic e ect on the two-level FLP due to rainfall in the network links, between the DCs and CPs, has been studied. The ow of maize crop from PCs to CPs through DCs is designed at a minimum cost under deterministic and stochastic scenarios. The three decisions made simultaneously are: to determine the locations of DCs (including number of DCs), allocation of CPs to the selected DCs, allocation of selected DCs to PCs, and to determine the amount of maize crop transported from PCs to DCs and then from DCs to CPs. We have modelled the problem and generate results by optimizing the model with respect to optimal location-allocation strategies. We have considered two networks, the existing network and an extended network. In the existing network there are four PCs, ve DCs and ninety three CPs. In the extended network three additional DCs are considered. For the modelling purpose we have used the rainfall data from 2007 - 2010 in each week for 17 weeks. The optimized results for the existing network have shown improvements in cost saving compared to the manually operated existing network. In the extended network, the results have shown much more e cient and cost saving distribution system compared to the results of the existing network.

APA, Harvard, Vancouver, ISO, and other styles

46

Lin, Chien-Hung, and 林建宏. "Design of High Performance DDFS Based on the Symmetry of Sinusoidal Waves and the Two-Level Lookup Table Algorithm." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/49099284070286898779.

Full text

Abstract:

博士
國立彰化師範大學
電機工程學系
99
According to the difference in the design structure, the Direct Digital Frequency Synthesizer (DDFS) can be classified into the ROM-base direct digital frequency synthesizer and the ROM-less direct digital frequency synthesizer. The former, due to its larger chip area and memory power consumption, affects the entire DDFS performance, while the latter is criticized by its poor performance of output spectral purity and complex calculations. In order to break the bottleneck of the design, this dissertation presents a new algorithm to design a new DDFS. This algorithm utilizes the symmetry properties of trigonometric functions to image a sinusoidal wave with a phase range of 0 to to the range of 0 to , and then uses the trigonometric function formula incorporated with Taylor’s series and a linear interpolation method to reduce the original ROM of 18-bit to the cosine and tangent functions with a ROM size of 16-bit. Thus, a new algorithm of two-level lookup table can be installed and the ROM area can be decreased under little degradation of the output signals. As compared with other two-level lookup table DDFSs of similar design structure, the required ROM area decreases 32%. In addition, as compared with other not two-level lookup table DDFSs, the DDFS designed in this dissertation has lower power consumption and smaller chip area. Therefore, it is very suitable for wireless communication and portable communication devices. The research results show that this DDFS owns benefits of highspeed frequency transformation, ultrahigh frequency resolution, low phase noise, and low power consumption. Moreover, the phase of the frequency transform is continuous that it can perform direct digital phase and frequency modulation. This study utilizes the Modelsim development tool and the Verilog hardware-description language, and also applies the devices of Taiwan Semiconductor Manufacturing Company (TSMC) to achieve the development, design, simulation, and analysis of DDFS. The verified results show that under a 3.0-V operation voltage the averaged Spurious-Free Dynamic Range (SFDR) of the designed DDFS achieves 81.2 dBc and the frequency resolution reaches 419.6 Hz with a working frequency up to 110 MHz, while the power consumption is only 68.2 mW. In other words, the averaged power consumption is 0.68 mW per megahertz, which is far less than those of other conventional DDFSs. Therefore, the research result can provide a reference for the future development and applications of DDFS technologies. Keywords: Direct digital frequency synthesizer, spectrum purity, frequency resolution, read only memory, spurious-free dynamic range.

APA, Harvard, Vancouver, ISO, and other styles

47

Liu, Cheng Chung, and 劉政忠. "The Design of High-speed, Two-Dimensional, Multi-level Discrete Wavelet Transform as a Silicon Intelligent Property in Embedded Systems." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/76674633897879588668.

Full text

Abstract:

碩士
中華技術學院
電子工程研究所在職專班
97
In this paper, we propose a high-speed VLSI architecture for implementation of the forward two-dimensional multi-stage ,lift-based discrete wavelet transform (DWT) . We expend one-dimensional discrete wavelet transform to two-dimensional discrete wavelet transform, and replace them by traditional rows-and-columns method. The structure designed on central and nearby pixels connection basically. As for one N*N image, the calculate time of traditional row-and-column DWT design on two-dimensional multi-stage requires N2. On the other hand, the architecture we proposed only requires N2/4. The proposed architecture coded by Verilog HDL in the beginning and verify by Modelsim preliminary. Finally it was implemented in an Altrea Cyclone II family FPGA, which equal with camera and display processing platform, and comes out one two-dimensional DWT image draft. Meanwhile, execute tsmc 0.18um processing data is applied by cell-based flow to complete the layout. Consequently, the circuit will be infixed by one FPGA ARM10-IntelPXA embedded platform in one IP.

APA, Harvard, Vancouver, ISO, and other styles

48

Yu-Chin, Chen, and 陳宥瑾. "Optimization of Feeding Solution Concentration and Feeding Time for Poly(glutamic acid) Production by Bacillus licheniformis with Two-Level Fractional Factorial Design." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/02454111931792890005.

Full text

Abstract:

碩士
大葉大學
生物產業科技學系
93
In this study, the optimization of feeding solution concentration and feeding time for poly-γ-glutamic acid (γ-PGA) by Bacillus licheniformis CCRC 12826 was investigated by using two-level factional factorial design. It was found that the optimal volume of the suitable feeding solution comprising 40.0g/L glutamic acid, 42.0g/L citric acid, 158.0g/L glycerol, 1.0g/L NH4Cl, was 25mL and the optimal feeding time was at 20h of cultivation. When 25mL of the suitable feeding solution was added to the originally designed medium at 20h of cultivation, the yield of γ-PGA production was 27.4g/L at 120h of cultivation. It was little less than the yield (28.3g/L) without any feeding solution. When the volume of the feeding solution was reduced from 25mL to 5mL, the component concentrations were calculated to be 200.0g/L glutamic acid, 210.0g/L citric acid, 790.0g/L glycerol, 5.0g/L NH4Cl. When this concentrated feeding solution was fed at the optimal feeding time described above, the yield of γ-PGA production was 31.2g/L at 120h of cultivation. The γ-PGA production was increased by 10.21% from 28.3 to 31.2g/L, while the yield was 37.7g/L after 144h of cultivation and it was increased significantly by 33.25%. With these feeding processes, the culture time for the highest yield of γ-PGA production was delayed. However, this research demonstrated that the feeding processes with the two-level factional factorial design were worth using to improve the yield of γ-PGA production by B. licheniformis CCRC 12826.

APA, Harvard, Vancouver, ISO, and other styles

49

Salama, Cherif. "Static Analysis for Circuit Families." Thesis, 2010. http://hdl.handle.net/1911/64203.

Full text

Abstract:

As predicted by Gordon Moore, the number of transistors on a chip has roughly doubled every two years. Microprocessors featuring over a billion transistors are no longer science fiction. For example, Intel’s Itanium 9000 series and Intel’s Xeon 7400 series of processors feature 1.7 and 1.9 billion transistors respectively. To keep up with the emerging needs of contemporary very large scale integration (VLSI) design, industrial hardware description languages (HDLs) like Verilog and VHDL must be significantly enhanced. This thesis pinpoints some of the main shortcomings of the latest Verilog standard (IEEE 1364-2005) and shows how to overcome them by extending the language in a backward compatible way. To be able to cope with more complex circuits, well-understood higher-level abstraction mechanisms are needed. Verilog is already equipped with promising generative constructs making it possible to concisely describe a family of circuits as a parameterized module; however these constructs suffer from two problems: First, their expressivity is limited and second, they are not adequately supported by current tools. For instance, there are no static guarantees about the properties of the description generated as a result of instantiating a generic description with particular parameter values. Addressing both problems while remaining backward compatible led us to select a statically typed two-level languages (STTL) formal framework. By formalizing a core subset of Verilog as an STTL, we were able to define a static type system capable of: 1) checking the realizability of a description, 2) detecting bus width mismatches and array bounds violations, and 3) providing parametric guarantees on the resources required to realize a generic description. The power of the chosen framework is once more demonstrated as it also allows us to enrich the language with a new set of constructs that are designed to be expanded away when instantiated. To experiment with these ideas we implemented VPP, a Verilog Preprocessor with a built-in type checker. VPP is an unobtrusive tool accepting extended Verilog descriptions but generating descriptions compatible with any tool compliant with the Verilog standard. Our experience throughout this research showed that STTLs present a particularly suitable framework to formalize and implement generative features of a language.
Rice University, National Science Foundation (NSF) SoD award 0439017, Intel Corporation, Semiconductor Research Corporation (SRC) Task ID 1403.001

APA, Harvard, Vancouver, ISO, and other styles

50

Tsai, Yi-Ling, and 蔡依玲. "Optimal Designs with Two-and Four-Level Factors." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/57410002082046275147.

Full text

Abstract:

碩士
國立高雄師範大學
數學系
94
In this thesis, we try to define MA criteria for 4^3*2^m mixed designs according to MA criteria proposed by Wu (1939) for 4^1*2^m and 4^2*2^m mixed designs. By means of strong operation function of the computer, Wu exhausted all possible mixed designs and provided the optimal 4^1*2^m and 4^2*2^m mixed designs with 16 and 32 runs. In view of Ankenman's paper(1999), we try to search the optimal 4^1*2^m , 4^2*2^m and 4^3*2^m mixed designs with 16 and 32 runs of the MA criterion from 2^(k-p) fractional factorial designs. We present a procedure for effective searching optimal 4^n*2^m mixed designs with 16runs (n=1,2,3) and another procedure for effective searching more complicated optimal 4^n*2^m mixed designs with 32runs (n=1,2,3). Afterwards, we give two examples, respectively. Finally, we discuss the difference between Wu’s optimal mixed designs and Ankenman’s optimal mixed designs.

APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic 'Two-level design'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles