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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.
21

A SOM+ Diagnostic System for Network Intrusion Detection

Langin, Chester Louis 01 August 2011 (has links)
This research created a new theoretical Soft Computing (SC) hybridized network intrusion detection diagnostic system including complex hybridization of a 3D full color Self-Organizing Map (SOM), Artificial Immune System Danger Theory (AISDT), and a Fuzzy Inference System (FIS). This SOM+ diagnostic archetype includes newly defined intrusion types to facilitate diagnostic analysis, a descriptive computational model, and an Invisible Mobile Network Bridge (IMNB) to collect data, while maintaining compatibility with traditional packet analysis. This system is modular, multitaskable, scalable, intuitive, adaptable to quickly changing scenarios, and uses relatively few resources.
22

Účetní versus ekonomická přidaná hodnota / Accounting versus Economic Value Added

KANTOVÁ, Lucie January 2011 (has links)
The theme of the thesis is to compare the accounting and economic value added. The theoretical part describes the value added and its determinants. It is defined as economic value added. The first is the basic formula for calculating the economic value added, and the identification of variables that are needed to calculate. The most important variable is the weighted average cost of capital. The next section is defined by other methods which can calculate EVA. The practical section provides the necessary methods and procedures for calculating the financial and economic value added. Methods chosen for the calculation were: the CAPM method, Modular method and Benchmarking diagnostic system of financial indicators INFA.
23

Modeling Behaviour of Damaged Turbine Blades for Engine Health Diagnostics and Prognostics

Van Dyke, Jason January 2011 (has links)
The reliability of modern gas turbine engines is largely due to careful damage tolerant design a method of structural design based on the assumption that flaws (cracks) exist in any structure and will continue to grow with usage. With proper monitoring, largely in the form of periodic inspections at conservative intervals reliability and safety is maintained. These methods while reliable can lead to the early retirement of some components and unforeseen failure if design assumptions fail to reflect reality. With improvements to sensor and computing technology there is a growing interest in a system that could continuously monitor the health of structural aircraft as well as forecast future damage accumulation in real-time. Through the use of two-dimensional and three-dimensional numerical modeling the initial goals and findings for this continued work include: (a) establishing measurable parameters directly linked to the health of the blade and (b) the feasibility of detecting accumulated damage to the structural material and thermal barrier coating as well as the onset of damage causing structural failure.
24

Vliv frekvenčního měniče na životnost ložisek a jejich poškození / The influence of the frequency converter on the life and damage of bearings

Mynář, Josef January 2018 (has links)
The diploma thesis deals with the technical diagnostics of machines with a closer focus on vibrational diagnostics. In the thesis is elaborated a design of a diagnostic system with measurement methodology, measurement procedure and evaluation of measured data on the machine produced by Siemens.
25

Vizualizace a on-line kontrola důležitých parametrů blokových a odbočkových transformátorů jaderné elektrárny Dukovany / Visualization and online control of important parameters of block and tap-changing transformers at the Dukovany nuclear power plant

Holeš, David January 2020 (has links)
The thesis focuses on a design of visualization and setting limits of important parametres of power and own-consumption transformers at the nuclear power plant Dukovany. In the first part there is a description of a present technical state of oil power transformers at this power plant, including a description of a currently installed transformers monitoring system and electro monitoring system. The second part deals with a design of a visialization of parametrs and a diagram design of active-access displays of monitored parametrs of these transformers. In the thesis there is also a description of web interface with a new visualization. The last part of the thesis contains a design of setting the limits and criteria of important monitoring parametres of these transformers.
26

Spolehlivost výkonových olejových transformátorů / Reliability of Power Oil Transformers

Ertl, Jakub January 2013 (has links)
The doctoral thesis deals with design of non-invasive methods for estimated reliability analysis of power oil transformers. Such procedures also solve two-state and multistate reliability problems together with applying of gained reliability characteristics in planning further operation of these non-rotating electrical machines. Reliability module for diagnostic system, which is developed at the training workplace, is designed in conclusion of this thesis. All the above procedures were verified on data obtained from diagnostic measurements of ten power oil transformers operating in different power plants in the Czech Republic.
27

精熟學習策略配合數位化診斷系統對高工學生數學科學習成效之研究 / A Study on Math Learning Effectiveness of Vocational High School Students Using Mastery Learning Strategy with Computerized Diagnostic System

滕春麗 Unknown Date (has links)
為達成「精熟學習」的教與學過程中強調的個別化教學、學生學習的回饋、校正學生學習錯誤等高效能的教學理想。本研究自行發展一套數位化診斷系統,在不改變學校政策、班級作息、教室管理實施情況下,對準備參加科大入學測驗高工三年級的學生,在考前六週進行數學科總複習的「精熟學習配合數位化診斷」實驗教學。經由學生的作答反應,本診斷系統完成以下功能: (1)能快速的篩選出優良試題,並提供試題的難度、鑑別度、答對率與評鑑試題的品質。 (2)能診斷出個別學生與試題的差異性,並完成試題卷的信度、效度評鑑與S-P分析表。 (3)能提供完整的學習成就遷移記錄,並可歸類出學生學習潛能與整體學習表現。 (4)能彙整出學生學習成效與具體教學建議。 教師藉診斷系統所提供的資訊,對學生進行個別化校正或充實教學,期以達成精熟學習的教學理想。並在實驗教學後分析學生學習回饋單,大多數學生對實驗教學法持正面態度,且自認學習態度更積極,並建議若能提早實施精熟學習配合數位化診斷教學,應會有更好成績表現。 本研究並探討「實驗教學」的實驗A組學生,分別對「不同科別」的實驗B組學生與對「傳統教學」的控制C組學生的數學學習態度、學習成就、學習成就絕對均差的差異性,經單因子共變數分析,排除前測影響後,具體結論如下: (1)實驗A、B組與控制C組學生在數學學習態度後測得分並無明顯差異。 (2)實驗A組與控制C組在數學學習成就後測成績有明顯差異,且實驗A組分數明顯高於控制C組。 (3)不同科別實驗組的A組電機類與B組機械類學生,在數學學習成就後測成績有明顯差異,且電機類分數明顯高於機械類,但機械類排除未完成實驗的學生後,則不同科別的實驗A組、實驗B組,在數學學習成就後測成績無明顯差異。 (4)實驗A組與控制C組學生在數學學習成就後測成績的絕對均差有明顯差異,且實驗A組絕對均差小於控制C組。 最後為使實驗教學能更順利進行,建議教學前先營造愉快與舒適教學環境與良好的師生互動情誼再實施,這將會是實驗教學成功的關鍵 / Mastery Learning Strategy is a highly effective teaching method, emphasizing the importance of individualized tutoring, student feedback and learning error correction. In this study, a self-devised computerized diagnostic system was developed for the third-year vocational high school students who were preparing for the technological university entrance examination. An experimental teaching method using Mastery Learning Strategy with computerized diagnostic system was given to the aforementioned students as a math review lesson six weeks before the entrance examination, following the original school policy, class schedule or class management. From test responses, the diagnostic system achieved the following: (1)Quick selecting of good quality test items. It also evaluates the test items and provides the difficulty, discrimination, and correction rates of them. (2)Individualized diagnosis of each student vs. test items. It also completes the reliability, validity and S-P charts of the test. (3)Offering a comprehensive record of the learning process. It also analyzes the learning process of the students and sorts out their learning potential. (4)Analyzing students’ learning effects and coming up with teaching suggestions. In this experiment, the data gained from the diagnosis were used to provide each student with individualized instruction or error correction with the hope of attaining the goals of Mastery Learning. The analysis of the students’ feedback after the experimental teaching method showed that most students thought positively of the experiment, admitting that they developed a more aggressive learning attitude, and suggested that this computerized diagnostic system, had it been implemented earlier, would have helped them achieve even better grades. The students in this study consisted of three groups. Group A and B were both experimental groups except that group A were students from electrical engineering department while group B were students from mechanical engineering department. Group C was the control group receiving only conventional teaching method. Group A was compared with group B and group C respectively in terms of differences in math-learning attitude, math-learning achievement, and in the absolute mean deviation of learning achievement. By means of one-way analysis of covariance, with pre-test effects eliminated, the conclusions were as follows: (1)None of the groups exhibited significant grade differences on the math-learning attitude post-test. (2)Group A scored significantly higher on the math-learning achievement post-test than did Group C, the control group. (3)Group A of electrical engineering students scored significantly higher on the math-learning achievement post-test than did Group B of mechanical engineering students. However, if the grades of the Group B students who didn’t complete the experiment were unaccounted, no grade difference was noticeable on the math-learning achievement post-test between Group A and Group B. (4)Group A, the experimental group, had significantly lower absolute mean deviation on the math-learning achievement post-test than did Group C, the control group. Finally, it was suggested that creating a comfortable environment for teaching and learning as well as an advance establishment of a good teacher-student rapport are the key to a smooth-going and successful experimental teaching method.
28

Diagnostika výkonnosti podniku / Diagnostic of the business performance

HOZMANOVÁ, Carmen January 2012 (has links)
The work deals with the diagnostic of the business performance for the period 2005 - 2010, were used traditional and modern indicators for evaluation, composite indices and models of bankruptcy and financial standing. At the conclusion of the work were objective evaluation of overall performance results obtained compared with average values in the diagnostic system using financial indicators INFA objective evaluation.
29

Analýza současného business modelu společnosti Laminar Medica (CE) s.r.o. / Analysis of the current business model of Laminar Medica (CE) s.r.o.

Kozel, Adam January 2015 (has links)
The main aim of this master thesis is to analyse the current business model of Laminar Medica (CE) s.r.o.. Theoretical and methodological part contains the definitions of partial analyzes methodologies and procedures which will be utilized in the practical part. The second part of the thesis besides characteristics of the company itself focuses mainly on practical implementation and linkage of the partial analyzes. Their main purpose is to create comprehensive picture of current business model of the company Laminar Medica (CE) s.r.o., create financial plan and estimate the appraisal of the company. In the last part of the thesis, there will be an accomplished summarization of the main findings and formulation of the recommendations on how to enhance function of the current business model.
30

Návrh a realizace bezdrátového interface ODBII-XBee / Design and realization of wireless interface ODBII-XBee

Zatloukal, Martin January 2010 (has links)
This master’s thesis describes possibilities of usage of ZigBee communication protocol and integrated circuit ELM 327 in problem of realization universal diagnostic device, running by OBDII communication standards, which can be used to monitor function of all car´s electronic systems. Thesis also deals with design and realization of necessary electro technical devices and modules followed by compilation of control software and experimental measurements of these devices in real traffic flow. In the first part of project, there are reminded some basic features and parameters of OBDII, followed by description of ways how to use OBDII and adumbrating how to realize universal diagnostic system. The analysis of ZigBee system focused on XBee circuits follows. Construction, ways of data transfer and possibilities of controlling are described. Integrated circuits produced by ELM Electronics Company are introduced and possibilities of usage ELM 327 are described as requested by main task. Second part talks about designing of electronic circuits of this system, assembling schematic diagram and designing sources for production of PCB. Physical realization of these circuits and its first start is also included. Thesis finishes by dealing with practical experiences and measurements using real vehicles. This part talks also about means to improve system by several software solutions to reach more effective functioning of created device.

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