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Warnquist, Håkan. "Computer-Assisted Troubleshooting for Efficient Off-board Diagnosis." Licentiate thesis, Linköpings universitet, Institutionen för datavetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-67522.
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This licentiate thesis considers computer-assisted troubleshooting of complex products such as heavy trucks. The troubleshooting task is to find and repair all faulty components in a malfunctioning system. This is done by performing actions to gather more information regarding which faults there can be or to repair components that are suspected to be faulty. The expected cost of the performed actions should be as low as possible. The work described in this thesis contributes to solving the troubleshooting task in such a way that a good trade-off between computation time and solution quality can be made. A framework for troubleshooting is developed where the system is diagnosed using non-stationary dynamic Bayesian networks and the decisions of which actions to perform are made using a new planning algorithm for Stochastic Shortest Path Problems called Iterative Bounding LAO*. It is shown how the troubleshooting problem can be converted into a Stochastic Shortest Path problem so that it can be efficiently solved using general algorithms such as Iterative Bounding LAO*. New and improved search heuristics for solving the troubleshooting problem by searching are also presented in this thesis. The methods presented in this thesis are evaluated in a case study of an auxiliary hydraulic braking system of a modern truck. The evaluation shows that the new algorithm Iterative Bounding LAO* creates troubleshooting plans with a lower expected cost faster than existing state-of-the-art algorithms in the literature. The case study shows that the troubleshooting framework can be applied to systems from the heavy vehicles domain.
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GEORGII, HEMMINGCYON ALEXANDER. "Modeling of Fuel InjectionSystem for Troubleshooting." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-137969.
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With the technology progressing further, making heavy duty vehicles more complex, more computerized, it becomes necessary to update the troubleshooting process of such vehicles. From the vehicles´ computers, diagnosis trouble codes can be extracted, informing the mechanic about the health of the vehicle. Using those codes, together with physical observations, as input for a diagnosing software, the software can give educated troubleshooting advice to the mechanic. Such diagnosing software requires a model of the vehicle or one of its system, which mimics the behavior of the real one. If there would be a one-to-one correspondence between observations and diagnosis, the model would be completely accurate. However, no such one-to-one correspondence exists. This makes the system non-deterministic. therefore the model has to be constructed using another approach. This master thesis presents a statistical model of a fuel injection system called XPI. The XPI-system is modeled using a statistical model called a Bayesian network which is a convenient way to model a non-deterministic system. The purpose of this model is to be able to make diagnosis of the XPI-system, but also to ease the understanding of the dependency between components and faults in the XPI-system. The model is also used to evaluate detectability and isolability of faults in the XPI-system.<br>Då teknologins utveckling gör tunga fordon mer komplexa, mer datorberoende, blir det nödvändigt att modernisera felsökning av dessa fordon. Från fordonens datorer kan felkoder avläsas. Dessa felkoder meddelar mekanikern om fordonets skick. Felkoderna, i kombination med fysiska observationer, kan användas som indata till en diagnostiseringsmjukvara, som kan förse mekanikerna med kvalificerade felsökningsråd. En sådan diagnostiseringsmjukvara kräver en modell av fordonet, eller ett delsystem av det, vilken modellerar beteendet av det riktiga systemet. Om det skulle finnas en ett-till-ett mappning mellan observationer och diagnoser, skulle modellen ha fullständig precision. Dessvärre finns det ingen sådan ett-till-ett mappning. Modellen måste således konstrueras med en annan metod. Detta examensarbete presenterar en statistisk modell av ett bränslesystem kallat XPI. Denna typ av statistiska modell kallas för ett Bayesianskt nätverk, som är lämpligt att använda vid modellering av icke-deterministiska system. Syftet med denna modell är att den ska kunna diagnostisera XPI-systemet samt underlätta förståelse för beroendet mellan komponenter och fel. Modellen kan också användas för att utvärdera urskiljbarhet och isolerbarhet hos fel i XPI-systemet.
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Kelley, William Laurence. "TRANSFERABILITY OF COMPUTER SIMULATED TROUBLESHOOTING SKILLS TO THE ACTUAL EQUIPMENT." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/188151.
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This study looks into the ability of computer systems, using both video disc images and overlay graphics, to replicate the Army's new M1 tank, so that soldiers using a light pen and simulated test equipment can effectively troubleshoot the tank, using only the technical manual and video terminal display. The computer trained students were then compared with an untrained control group to see if the simulated "hands-on" skills could be effectively transferred to the actual M1 tank during a real troubleshooting exercise. Students' attitudes were also sampled to provide an affective evaluation of the troubleshooting simulation. Research reveals that computer-assisted instruction has had some success in training electrical troubleshooting. The need to train soldiers in mechanical maintenance and the high cost of using the real tank system as a teaching aid led to this study of using computer technology as a cost effective alternative. An analysis of variance showed a significant difference between the training group and the control group in the number of errors made and the number of correct steps per minute at the p > .05 level. An additional test showed that skills learned could be further transferred to a similar, but untrained task on the tank. Students' affective responses indicated that they enjoyed learning from the computer simulation. This technique may have a major implication for civilian education as well. It could be possible to use this interactive video/computer technique to teach 'hands-on' tasks, ranging from chemistry lab experiments to overhauling an automotive transmission. Students could simulate selected tasks, equipment, supplies, and procedures repeatedly to gain mastery in complete safety without consuming valuable resources. Student performance on the computer terminal has been shown to be directly transferable to the actual equipment, and the substitute computer training has been acknowledged by the students as being an enjoyable and worthwhile experience.
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Säby, Petter, and Håkan Warnquist. "Conditional Planning for Troubleshooting and Repair in a Partially Observable Environment." Thesis, Linköping University, Department of Computer and Information Science, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11516.
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<p>Vehicles of today contain many advanced and complex systems, systems that make it hard for the mechanics working with them to keep an overview. In addition, new systems are introduced at an increasingly higher pace, which makes it hard or impossible for the mechanics to keep a both broad and deep competence. Consequently, to maintain a fast and efficient repair process, there is a need for computer-aided diagnosis.</p><p>In this thesis we develop a method for choosing the best "next action" in a repair process, using observations and a probability model. We describe the state of the system as a belief-state, a probability distribution over the faults that can occur on the system. An AND/OR-tree is used when searching for the optimal repair plan. We use entropy to speed up the algorithms. To avoid expensive validation actions, the system functionality is only inspected if the probability of having a fault free system is above a certain level.</p><p>The method is compared with two implementations of an existing method, with good results. The method can favorably be used on systems with many possible faults.</p>
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Brennan, Catherine M. (Catherine Marie). "Representing troubleshooting information for a high-volume production line." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/35384.
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Thesis (M.S.)--Massachusetts Institute of Technology, Sloan School of Management, 1994, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.<br>Includes bibliographical references (p. 75).<br>by Catherine M. Brennan.<br>M.S.
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Wang, Chengwei. "Monitoring and analysis system for performance troubleshooting in data centers." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50411.
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It was not long ago. On Christmas Eve 2012, a war of troubleshooting began in Amazon data centers. It started at 12:24 PM, with an mistaken deletion of the state data of Amazon Elastic Load Balancing Service (ELB for short), which was
not realized at that time. The mistake first led to a local issue that a small number of ELB service APIs were affected. In about six minutes, it evolved into a critical one that EC2 customers were significantly affected. One example was that Netflix, which was using hundreds of Amazon ELB services, was experiencing an extensive streaming service outage when many customers could not watch TV shows or movies on Christmas Eve. It took Amazon engineers 5 hours 42 minutes to find the root cause, the mistaken deletion, and another 15 hours and 32 minutes to fully recover the ELB service. The war ended at 8:15 AM the next day and brought the performance
troubleshooting in data centers to world’s attention. As shown in this Amazon ELB case.Troubleshooting runtime performance issues is crucial in time-sensitive multi-tier cloud services because of their stringent end-to-end timing requirements, but it is also notoriously difficult and time consuming.
To address the troubleshooting challenge, this dissertation proposes VScope, a flexible monitoring and analysis system for online troubleshooting in data centers.
VScope provides primitive operations which data center operators can use to troubleshoot various performance issues. Each operation is essentially a series of monitoring and analysis functions executed on an overlay network. We design a novel
software architecture for VScope so that the overlay networks can be generated, executed and terminated automatically, on-demand. From the troubleshooting side, we design novel anomaly detection algorithms and implement them in VScope. By
running anomaly detection algorithms in VScope, data center operators are notified when performance anomalies happen. We also design a graph-based guidance approach, called VFocus, which tracks the interactions among hardware and software components in data centers. VFocus provides primitive operations by which operators can analyze the interactions to find out which components are relevant to the
performance issue.
VScope’s capabilities and performance are evaluated on a testbed with over 1000 virtual machines (VMs). Experimental results show that the VScope runtime negligibly perturbs system and application performance, and requires mere seconds to deploy monitoring and analytics functions on over 1000 nodes. This demonstrates VScope’s ability to support fast operation and online queries against a comprehensive set of application to system/platform level metrics, and a variety of representative analytics functions. When supporting algorithms with high computation complexity, VScope serves as a ‘thin layer’ that occupies no more than 5% of their total latency. Further, by using VFocus, VScope can locate problematic VMs that cannot be found
via solely application-level monitoring, and in one of the use cases explored in the dissertation, it operates with levels of perturbation of over 400% less than what is seen for brute-force and most sampling-based approaches. We also validate VFocus
with real-world data center traces. The experimental results show that VFocus has troubleshooting accuracy of 83% on average.
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Lorentzon, Lukas. "Investigation of a troubleshooting procedure : By assessing fault tracing algorithms." Thesis, Linköpings universitet, Fordonssystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-110656.
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The thesis delves into the area of troubleshooting procedures, an interesting areafor industry. Many products in industry tend to be complex, which in turn makestroubleshooting procedures trickier. A fast and efficient repair process is oftendesired, since customers want the product to be repaired as fast as possible. The purpose of a troubleshooting procedure is to find a fault in a broken product,and to choose proper repair actions in a workshop. Such a procedure can besimplified by diagnosis tools, for example software programs that make faultconclusions based on fault codes. These tools can make such conclusions withthe help of algorithms, i.e. fault tracing algorithms. Before a product release, it is hard to specify all faults and connections in the system.New unknown fault cases are likely to arise after release, and somehow thisneed to be taken into account in the troubleshooting scenario. The troubleshootingprocedure can be made more robust, if new data could be easily incorporatedin the current structure. This work seek to answer how new data can be incorporatedin trouble shooting procedures. A good and reliable fault tracing algorithm is essential in the process of findingfaults and repair actions, which is the reason behind the focus of this thesis. Thepresented problem asks how a fault can be identified from fault codes and symptoms,in order to recommend suitable repair actions. Therefore, the problem isdivided into two parts, finding the fault and recommending repair actions. Inthe first part, three candidate algorithms for finding the faults are investigated,namely Bayesian networks, neural networks, and a method called matrix correlationinspired from latent semantic indexing. The investigation is done by trainingeach algorithm with data, and evaluating the results. The second part consists ofone method proposal for repair action recommendations and one example. Thetheoretical investigation is based on the Servo unit steering (SUS), which residein the IPS system of Volvo Penta. The primary contribution of the thesis is the evaluation of three different algorithmsand a proposal of one strategy to recommend suitable repair actions.In this study Bayesian networks are found to conform well with the desired attributes,which in turn lead to the conclusion that Bayesian networks is well suited for this problem.
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Sköld, Martin. "Using NLP Techniques for Log Analysis to Recommend Activities For Troubleshooting Processes." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-289408.
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Continuous Integration is the practice of building and testing software every time a code change is merged into its entire codebase. At the merge, the source code is compiled, dependencies are resolved, and test cases are executed. Detecting a fault at an early stage implies that fewer resources need to be spent to find the fault since fewer merges need to be checked for errors. In this work, we analyze a dataset that comes from a Ericsson Continuous Integration flow that executes test cases daily. We create models to efficiently classify log events of interest in logs from failing test cases. For all models, each word in the log events is exchanged with the corresponding word embedding. The embeddings come from the FastText Continuous Bag of Words and Skip-gram models that use character n-grams for each word. For Linear Regression, Random Forest, XGBoost model, Support Vector Machine, and Multi-layer Perceptron, the word embeddings of the words of the log event is merged by weighting the words with the corresponding frequency-inverse document frequency from the dataset. The best performance was achieved with XGBoost, with a mean F1-score of 0:932 and a standard deviation of 0:034 when evaluating 100 3-fold cross-validations with different seeds. The LSTM model, which takes sequential input, got a mean F1-score of 0:896 and a standard deviation of 0:061. These results demonstrate the suitability of our approach to facilitating log analysis and defects detection tasks, reducing time and effort from developers.<br>Kontinuerlig integration är när man bygger och testar mjukvara varje gång en kodändring är sammanslagen med kodbasen. När sammanslagningen utförs så är källkoden kompilerad, beroenden är lösa, och testfall är exekverade. Upptäckten av en fel tidigt betyder att mindre resurser behöver läggas på att hitta felet, eftersom färre kodsammanslagningar behöver analyseras. I denna studie analyserar vi ett dataset som kommer från ett kontinuerligt integrations flöde hos Ericsson som utför testfall dagligen. Vi skapar en model som effektivt klassificerar loghändelser av intresse i loggar i loggar från fallerande test fall. Gemensamt för alla modeller är att varje ord är utbytt mot motsvarande ordinbäddningar som kommer från FastTexts Continuous Bag of Words och Skip-Gram modeller som använder n-grams av tecken för varje ord. För linjär regression, Random Forest, XGBoost, Support Vector Machine och Multi-Layer Perceptron modellerna så är ordinbäddningarna för orden i varje log meddelande sammanslagna genom att vikta dem med motsvarande frequency-inverse document frequency värde. Det bästa resultatet uppnåddes av XGBoost, med ett medelvärde på F1-score på 0.932 och en standardavvikelse på 0.034 när vi evaluerar 100 st 3-fold korsvalideringar med olika frön. LSTM modellen, som tar ordinbinbäddningarna i en sekventiell ordning, fick ett medelvärde på F1-score på 0.896 och en standardavvikelse på 0.061. Dessa resultat visar lämpligheten i vårt tillvägagångssätt för att underlätta logganalys, vilket reducerar den tid och fokus som utvecklare och utövare behöver lägga på att på logganalys.
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Shroff, Rahul. "A versatile internet-accessible electronics workbench with DC domain experimentation and troubleshooting capabilities." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/53138.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2009.<br>Includes bibliographical references (leaf 83).<br>iLabs are online laboratories that give students access to various experimental setups enabling them to conduct experiments based on real equipment via the Internet, remotely from any part of the world. The MIT iLab Project is dedicated to the proposition that iLabs can enrich science and engineering education by greatly expanding the range of experiments that students are exposed to. Using iLabs students complement their theoretical calculations and results with real data, providing them with a better understanding of a wide range of engineering concepts. Most recently, the iLab Project has focussed on building remote laboratories around the National Instruments Educational Laboratory Virtual Instrumentation Suite (ELVIS), a cost-effective, all-in-one electronics workstation. This thesis documents my efforts in extending the ELVIS iLab framework by enabling the investigation of the Direct Current domain through the addition of a new instrument, the Digital Multimeter. Using an augmented version of switching, this new instrument provides students with real-time, dynamic circuit testing and troubleshooting capabilities, unprecedented in an iLab. This significantly enhances an iLab's value as a versatile educational tool and represents a considerable step forward in bridging the gap between conventional and remote laboratories.<br>by Rahul Shroff.<br>M.Eng.
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Eliasson, Nina. "Finding the problem : Improvements to increase efficiency and usability when troubleshooting." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-167371.
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In a time where competition for software services is big and the time to market crucial, speed and productivity is the key to competing with other organizations. One of the competitors is Spotify, who provide an audio streaming platform to 286 million monthly active users around the world. Due to the number of users, a disturbance in the service has a great impact. In order to avoid disturbances, the back-end developers have to locate and solve the issue fast. To be able to identify user problems and frustrations with a troubleshooting tool, fifteen interviews and five observations were conducted. The resulting data, combined with the five-step Design Thinking model, resulted in the two defined problems: finding specific information and narrowing the problem space. Furthermore, a search feature and a feature to customize the view, were tested on a middle-fidelity prototype to investigate the impact on troubleshooting and the usability of the tool.
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Lampi, Evans. "The Effectiveness of Using Virtual Laboratories to Teach Computer Networking Skills in Zambia." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/22013.
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The effectiveness of using virtual labs to train students in computer networking skills, when real equipment is limited or unavailable, is uncertain. The purpose of this study was to determine the effectiveness of using virtual labs to train students in the acquisition of computer network configuration and troubleshooting skills. The study was conducted in the developing country of Zambia, where there is an acute shortage of network lab equipment. Effectiveness was determined by the transfer of skills learned in a virtual lab to a real lab. A two stage true experimental design, that compared the proficiency of randomly assigned experimental (virtual-lab) and control (no-virtual-lab) groups, was used to determine effectiveness (N = 56). In the first stage, the virtual-lab group practiced in a virtual lab while the no-virtual-lab group did not. Both groups were subjected to a lab test where the speed and accuracy of network configuration and troubleshooting of real equipment was measured, prior and after treatment. In the second stage, both groups practiced using real equipment and the speed and accuracy was again measured. An independent t-test was used to determine if there was a significant difference in the final performance between the two groups. It was found that there were significant differences between the groups in the configuration time (p = 0.011) and troubleshooting time (p = 0.03), favoring the virtual-lab group. On the other hand, there were no significant difference in configuration accuracy (p = 0.06) and troubleshooting accuracy (p = 0.440) between the two groups. In addition, there was positive transfer of training from the virtual lab to the real lab for configuration accuracy, configuration speed, troubleshooting accuracy and troubleshooting speed. There was also evidence that students showed performance gains both in using virtual and real labs by comparing their pre-test and post-test results. From the results, there is evidence that the use of virtual labs contributes positively to the transfer of practical computer networking skills from the virtual to the real lab environment. Hence, virtual labs were found to be effective in the teaching of computer networking skills relating to configuration and troubleshooting.<br>Ph. D.
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Marzo, i. Grimalt Núria. "Natural Language Processing Model for Log Analysis to Retrieve Solutions For Troubleshooting Processes." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-300042.
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In the telecommunications industry, one of the most time-consuming tasks is troubleshooting and the resolution of Trouble Report (TR) tickets. This task involves the understanding of textual data which can be challenging due to its domain- and company-specific features. The text contains many abbreviations, typos, tables as well as numerical information. This work tries to solve the issue of retrieving solutions for new troubleshooting reports in an automated way by using a Natural Language Processing (NLP) model, in particular Bidirectional Encoder Representations from Transformers (BERT)- based approaches. It proposes a text ranking model that, given a description of a fault, can rank the best possible solutions to that problem using answers from past TRs. The model tackles the trade-off between accuracy and latency by implementing a multi-stage BERT-based architecture with an initial retrieval stage and a re-ranker stage. Having a model that achieves a desired accuracy under a latency constraint allows it to be suited for industry applications. The experiments to evaluate the latency and the accuracy of the model have been performed on Ericsson’s troubleshooting dataset. The evaluation of the proposed model suggest that it is able to retrieve and re-rank solution for TRs with a significant improvement compared to a non-BERT model.<br>En av de mest tidskrävande uppgifterna inom telekommunikationsindustrin är att felsöka och hitta lösningar till felrapporter (TR). Denna uppgift kräver förståelse av textdata, som försvåras as att texten innehåller företags- och domänspecifika attribut. Texten innehåller typiskt sett många förkortningar, felskrivningar och tabeller blandat med numerisk information. Detta examensarbete ämnar att förenkla inhämtningen av lösningar av nya felsökningar på ett automatiserat sätt med hjälp av av naturlig språkbehandling (NLP), specifikt modeller baserade på dubbelriktad kodrepresentation (BERT). Examensarbetet föreslår en textrankningsmodell som, givet en felbeskrivning, kan rangordna de bästa möjliga lösningarna till felet baserat på tidigare felsökningar. Modellen hanterar avvägningen mellan noggrannhet och fördröjning genom att implementera den dubbelriktade kodrepresentationen i två faser: en initial inhämtningsfas och en omordningsfas. För industrianvändning krävs att modellen uppnår en given noggrannhet med en viss tidsbegränsning. Experimenten för att utvärdera noggrannheten och fördröjningen har utförts på Ericssons felsökningsdata. Utvärderingen visar att den föreslagna modellen kan hämta och omordna data för felsökningar med signifikanta förbättringar gentemot modeller utan dubbelriktad kodrepresentation.
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Rajabiyazdi, Fahimeh. "Design Concepts Towards Creating a Troubleshooting Knowledge Management SystemDesignkoncept för att skapa problemlösande system för kunskapsförvaltning." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-194088.
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Despite the influential impact of knowledge transfer in success of industrial domains, organizations still struggle to manage and maintain their experts’ knowledge and expertise. In this work, I target remote support engineers, and propose a model that supports them in capturing, visualizing, validating and sharing their knowledge in a way that is easily replicable in the future as well providing the means to access the right expert with the required expertise in case of shortage on documented knowledge. Based on field studies conducted, I identified remote support engineers’ needs for exchanging their knowledge and experiences gained during troubleshooting tasks. The design of the model was achieved by combining the theories of knowledge acquisition and applying HCI visualization tools. Finally, I conducted a participatory evaluation with experts from industrial sites to evaluate the model. The results of the evaluation indicate positive feedback towards the model presented and potential for improving the efficiency of troubleshooting procedures.
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Bärwald, Anton, and Jimmie Aleksic. "Felsökning av EtherNet/IP med cross-platform applikation." Thesis, Högskolan i Halmstad, Akademin för informationsteknologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-31244.
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In the industry there is a need for a more efficient way to troubleshoot machines that uses the protocol EtherNet/IP. The current methods is time consuming and complex. This project gather data from a simulated network and analyze the data. The result of the analyze is presented on a cellphone application with a description and a possible solution. The application is a cross-platform application developed with Cordova. The simulated network is created on a Raspberry Pi 2. The analyze is done on another Raspberry Pi 2 running the software Node-RED. Communication between the simulated network Raspberry and the cellphone is with Bluetooth Low Energy. Communication between cellphone and the server is with MQTT. There are several areas where this kind of application may suit. This project is in one specific area – troubleshooting EtherNet/IP.
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Skagerlind, Mikael. "Developing a methodology model and writing a documentation template for network analysis." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-32393.
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This report focuses on finding best practices and a better methodology when performing computer network analysis and troubleshooting. When network analysis is performed, computer network data packets are captured using data capturing software. The data packets can then be analysed through a user interface to reveal potential faults in the network. Network troubleshooting is focusing more on methodology when finding a fault in a network. The thesis work was performed at Cygate where they have recently identified needs for an updated network analysis methodology and a documentation template when documenting the network analysis results. Thus, the goal of this thesis has been to develop an elaborated methodology and discover best practices for network analysis and to write a documentation template for documenting network analysis work. As a part of discovering best practices and a methodology for network analysis, two laboratory tests were performed to gather results and analyse them. To avoid getting too many results but to still keep the tests within the scope of this thesis, the laboratory tests were limited to four network analysis tools and two test cases that are explained below. In the first laboratory test during three different test sequences, voice traffic (used in IP-phones and Skype etc.) is sent in the network using a computer program. In two of the test sequences other traffic is also congesting the network to disturb the sensitive voice traffic. The program used to send the voice traffic then outputs values; packet delay, jitter (variation in delay) and packet loss. Looking at these values, one can decide if the network is fit for carrying the sensitive voice traffic. In two of the test cases, satisfying results were gathered, but in one of them the results were very bad due to high packet loss. The second laboratory test focused more on methodology than gathering and analysing results. The goal of the laboratory test was to find and prove what was wrong with a slow network, which is a common fault in today’s networks due to several reasons. In this case, the network was slow due to large amounts of malicious traffic congesting the network; this was proven using different commands in the network devices and using different network analysis tools to find out what type of traffic was flowing in the network. The documentation template that was written as part of this thesis contains appealing visuals and explains some integral parts for presenting results when network analysis has been performed. The goal of the documentation template was an easy-to-use template that could be filled in with the necessary text under each section to simplify the documentation writing. The template contains five sections (headlines) that contain an explanation under it with what information is useful to have under that section. Cygate’s network consultants will use the documentation template when they are performing network analysis. For future work, the laboratory test cases could be expanded to include Quality of Service (QoS) as well. QoS is a widely deployed technology used in networks to prioritise different types of traffic. It could be used in the test cases to prioritise the voice traffic, in which case the results would be completely different and more favourable.
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Poole, Erika Shehan. "Supporting advice sharing for technical problems in residential settings." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37084.
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Visions of future computing in residential settings often come with assumptions of seamless, well-functioning, properly configured devices and network connectivity. In the near term, however, processes of setup, maintenance, and troubleshooting are fraught with difficulties; householders regularly report these tasks as confusing, frustrating, and unpleasant.
I conducted a series of empirical studies examining both the sources of digital complexity in residential settings well as how people cope with these complexities. Grounded in this fieldwork, I designed a technology probe called Tech Clips. Tech Clips facilitates the sharing of technology-related information by and for people within one's social network. I then conducted a long-term, real-world deployment study in which ten families used the software, while simultaneously completing a series of common computing setup and maintenance tasks. Based on the results of this study, I provide both a rich description of home technology usage and maintenance practices, as well as design implications for software systems that facilitate help-giving between family and friends.
The contributions of this research are (1) empirical studies of how lay people understand and cope with vexing technology problems in environments lacking technical experts; (2) the development of a software system to facilitate technical advice sharing; (3) deployment of this system in real-world settings; and (4) recommendations for the design of future tools for facilitating technical help-giving between family and friends.
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Qiu, Tongqing. "Understanding a large-scale IPTV network via system logs." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41228.
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Recently, there has been a global trend among the telecommunication industry on the rapid deployment of IPTV (Internet Protocol Television) infrastructure and services. While the industry rushes into the IPTV era, the comprehensive understanding of the status and dynamics of IPTV network lags behind. Filling this gap requires in-depth analysis of large amounts of measurement data across the IPTV network. One type of the data of particular interest is device or system log, which has not been systematically studied before. In this dissertation, we will explore the possibility of utilizing system logs to serve a wide range of IPTV network management purposes including health monitoring, troubleshooting and performance evaluation, etc. In particular, we develop a tool to convert raw router syslogs to meaningful network events. In addition, by analyzing set-top box (STB) logs, we propose a series of models to capture both channel popularity and dynamics, and users' activity on the IPTV network.
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Pastorio, Dioni Paulo. "ATIVIDADES DIDÁTICAS INOVADORAS DE MECÂNICA DE PARTÍCULAS COM DESENVOLVIMENTO DE COMPETÊNCIAS EM UM AMBIENTE DE COMPUTAÇÃO NUMÉRICA." Universidade Federal de Santa Maria, 2014. http://repositorio.ufsm.br/handle/1/6681.
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Fundação de Amparo a Pesquisa no Estado do Rio Grande do Sul<br>This study aimed to investigate how innovative problem-solving learning activities (AD), based on computer simulations, contribute to the development of conceptual, procedural and attitudinal contents. Yet these AD, aimed to develop associated with numerical computing environment (ACN) skills. For this reason, we work with the development, implementation and evaluation of structured from the problem-solving strategy AD. This motion has occurred along class of freshmen undergraduate course in Meteorology, Federal University of Santa Maria (UFSM). Data collection involved the following data collection instruments: initial and final questionnaires, records obtained from the person meetings and even from the responses obtained in the solutions delivered by students of AD. The analysis of these data was done at the time of evaluation, and allowed us to conclude that these activities provide the development of conceptual, procedural and attitudinal contents concomitantly, and the development of skills associated with a mathematical software for general use. Finally, the assessment performed by the students indicated that these activities are more instructive and interesting than the strategy of problem resolutions pencil and paper.<br>O presente trabalho procurou investigar como atividades didáticas (AD) inovadoras de resolução de problemas, baseadas em simulações computacionais, contribuem para o desenvolvimento de conteúdos conceituais, procedimentais e atitudinais. Ainda estas AD objetivaram o desenvolvimento de competências associadas a um ambiente de computação numérica (ACN). Para isso, trabalhamos com a elaboração, implementação e avaliação das AD estruturadas a partir da estratégia de resolução de problemas. Este processo de implementação ocorreu junto à turma de ingressantes de um curso de graduação em Meteorologias da Universidade Federal de Santa Maria (UFSM). A obtenção dos dados envolveu os seguintes instrumentos de coleta: questionários inicial e final, registros obtidos a partir dos encontros presenciais realizados e ainda a partir das respostas obtidas nas soluções das AD entregues pelos estudantes. A análise destes dados deu-se no momento de avaliação, e possibilitou-nos concluir que estas atividades proporcionam o desenvolvimento dos conteúdos conceituais, procedimentais e atitudinais concomitantemente, e ainda o desenvolvimento de competências associadas a um software matemático de uso geral. Por fim, a avaliação realizada pelos estudantes indicou que estas atividades são mais instrutivas e interessantes do que a estratégia de resoluções de problema de lápis e papel.
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Sestorp, Isak. "Requirements Elicitation for the User Experience in Troubleshooting and Debugging of Microservice Networks : A Study of how Visualization of Call Paths can be Utilized in a Software Tool." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-170303.
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Canahuire, Cabello Frank Alexis 1988. "Contribuições à detecção de falhas mecânicas sobre placas de circuito impresso usando processamento de imagens e o algoritmo SIFT." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260051.
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Orientador: Yuzo Iano<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação<br>Made available in DSpace on 2018-08-22T04:02:03Z (GMT). No. of bitstreams: 1
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Previous issue date: 2013<br>Resumo: A área que trata de detectar falhas mecânicas em circuito impresso é, atualmente, de grande importância. Isso se deve ao fato de que cada dia as empresas procuram de novas maquinas mais eficientes e rápidas para detectar falhas em placas. Existem diferentes tipos de falhas mecânicas em placas de circuitos impressos, como por exemplo, falta de componentes, falta de soldadura, má colocação de dispositivos, etc. Este trabalho dará uma contribuição para solucionar o problema de má colocação de dispositivos nas placas de circuito impresso. Para isso serão usadas imagens de placas de circuito impresso e será usado um algoritmo de detecção de características chamado SIFT o qual será modificado para esse propósito. A modificação do método SIFT será na etapa de matching (encontrar correspondências semelhantes entre duas imagens) e será desenvolvido um algoritmo usando métodos geométricos para eliminar as correspondências que não pertencem à mesma característica. Será comparado o SIFT modificado com os métodos SURF, SIFT e RANSAC para determinar seu desempenho em variações de escala, rotação, ruído gaussiano e brilho. Será usado o método SIFT desenvolvido neste trabalho para solucionar o problema de má colocação de dispositivos em placas de circuito impresso<br>Abstract: The area which comes to detect mechanical failures in printed circuit board is currently of great importance. This is due to the fact that every day companies seek new machines more efficient and quick to detect flaws in printed circuit boards. There are different types of mechanical faults in printed circuit boards, such as lack of components, poor weld, and bad placement devices and so on. This work will provide a contribution to solve the problem of poor placement of devices on printed circuit boards. For this, are used images of printed circuit boards and will use a method of feature detection called SIFT which will be modified for our purpose. The modification of the method SIFT is in the stage of matching (finding similar correspondences between two images) and will be developed an algorithm using geometric methods to eliminate the matches that do not belong to the same feature. Will be compared the modified SIFT with the methods SURF, SIFT and RANSAC to determine their performance in variations of scale, rotation, Gaussian noise and brightness. The SIFT method developed in this work will be used to solve the problem of poor placement of devices on printed circuit boards<br>Mestrado<br>Telecomunicações e Telemática<br>Mestre em Engenharia Elétrica
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Rajabiyazdi, Fahimeh. "Design Concepts TowardsCreating a TroubleshootingKnowledge Management System." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-195583.
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Despite the influential impact of knowledge transfer insuccess of industrial domains, organizations still struggle tomanage and maintain their experts’ knowledge andexpertise. In this work, I target remote support engineers,and propose a model that supports them in capturing,visualizing, validating and sharing their knowledge in away that is easily replicable in the future as well providingthe means to access the right expert with the requiredexpertise in case of shortage on documented knowledge.Based on field studies conducted, I identified remotesupport engineers’ needs for exchanging their knowledgeand experiences gained during troubleshooting tasks. Thedesign of the model was achieved by combining thetheories of knowledge acquisition and applying HCIvisualization tools. Finally, I conducted a participatoryevaluation with experts from industrial sites to evaluate themodel. The results of the evaluation indicate positivefeedback towards the model presented and potential forimproving the efficiency of troubleshooting procedures.<br>Trots den inflytelserika effekterna av kunskapsöverföring i framgången för industriella domäner, organisationerfortfarande kämpar för att hantera och underhålla deras experter kunskap och expertis. I detta arbete, jag riktafjärrsupport ingenjörer, och föreslå en modell som stöder dem i fånga, visualisera, validering och dela sin kunskap påett sätt som är lätt replikerbar i framtiden ger möjlighet att få tillgång till rätt expert med erforderlig expertis i frågaom brist på dokumenterad kunskap. Baserat på fältstudier som genomförts, identifierade jag fjärrsupport ingenjörerbehov av utbyte av sina kunskaper och erfarenheter under felsökning uppgifter. Utformningen av modellen uppnåddesgenom att kombinera teorier om kunskapsinhämtning och tillämpa människa-datorinteraktion visualiseringsverktyg.Slutligen genomförde jag en utvärdering deltagande med experter från industriområden att utvärdera modellen.Resultaten av utvärderingen visar positiv feedback till modellen presenteras och potential för att förbättraeffektiviteten i felsökning.
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Pettersson, Jack, and Frida Jansson. "Problem med trådlösa nätverk." Thesis, Mittuniversitetet, Avdelningen för informations- och kommunikationssystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-22306.
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Målet med detta arbete har varit att besvara frågan; ”Varför uppstår det så mycket problem med trådlösa nätverk?”. Detta har gjorts genom att studera relevant litteratur för att sedan kunna utföra två egna studier: en enkätundersökning och tre experiment. Teorin har framförallt hämtats ur kurser och material från Cisco. Undersökningen har hjälpt till att fastställa den generella datoranvändarens kunskaper om trådlösa nätverk. Respondenternas kunskapsnivå visade bland annat på skillnader i hur de använde sin utrustning; de med lägre kunskap om nätverk gick sällan eller aldrig in i sin routers webbgränssnitt. Det vanligaste problemet som uppgavs i undersökningen var en långsam trådlös hastighet; att uppleva svårigheter vid konfigurationen av en ny trådlös router visade sig däremot vara det mest ovanliga. Experimenten genomfördes med hjälp av två accesspunkter och två klientdatorer. De visade bland annat hur kanalöverlappning i trådlösa nätverk leder till minskad hastighet, och betonade även vikten av att välja rätt kanal. Avslutningsvis kunde vi konstatera att varken konsumenten eller teknikindustrin ensidigt kan beskyllas för problemen inom trådlösa nätverk. Båda två har enskilda saker att jobba på. Konsumenterna bör i allt högre grad ta reda på mer om den utrustning de använderför att undvika att ställa till problem, inte bara för sig själv men också för andra. Industrin skulle kunna underlätta genom att dra ner utvecklandet av nya standarder – och inte enbart fokusera på ökad genomströmningshastighet.<br>The goal with this research has been to answer the question; ”Why are there so many problems linked to wireless networks?”. This has been done by studying the relevant literature to then be able to conduct two self-written studies: one survey and three laboratory experiments. The theory has been taken primarily out of courses and material from Cisco. The survey has helped to determine the knowledge of the general computer-user in regards to wireless networks. The respondents level of knowledge showed, among other things, differences in the way they used their devices; those with less network-knowledge rarely, or never, accessed their routers web-interface. The most common problem that was selected in the survey was a slow wireless speed; experiencing difficulties when configuring a new wireless router proved to be the most unusual one. The experiments were completed through the use of two access points and two computer clients. They demonstrated, among other things, how channel overlap in wireless networks leads to a reduced data-rate, and also stressed the importance of choosing the right channel. Lastly, the work revealed that neither the consumer nor the industry can be solely blamed for the problems that appear in wireless networks. Both of them have separate things towork towards. The consumers should, to a higher extent, find out more about the equipment they use to avoid causing problems, not only for themselves but also for others. The industry could help by slowing down the development of new standards – and to not only focus on achieving higher throughput-rates.
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Яструбецький, І. О., та I. O. Yastrubetskyi. "Діагностування комп’ютерної мережі на основі її структурно-функціональної моделі". Thesis, Тернопільський національний технічний університет імені Івана Пулюя, 2015. http://elartu.tntu.edu.ua/handle/lib/20798.
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Дипломну роботу магістра присвячено розробці моделі та алгоритмів пошуку несправностей комп’ютерної мережі, що забезпечать зниження трудомісткості та скорочення часових витрат в процесі діагностування. Об’єктом дослідження є процеси діагностування комп’ютерних мереж.
В дипломній роботі магістра було розглянуто основні підходи до подання комп’ютерної мережі як об’єкта діагностування, переваги структурно-функціонального методу перед традиційними методами вирішення. Розглянуто та удосконалено методи пошуку явних та прихованих мережевих несправностей, це дало можливість підвищити ефективність процедури постановки діагнозу за рахунок забезпечення відповідної глибини пошуку несправності, знизити трудомісткість і скоротити часові витрати на пошук явних та прихованих мережевих несправностей.<br>Master's Thesis is dedicated to the development of models and algorithms for troubleshooting computer network that will reduce the complexity and reducing time spent in the process of diagnosis.
The object of research is the process of diagnosing computer networks.
In the master thesis work examined the main approaches to the presentation computer network as an object of diagnosis, the benefits of structural-functional method to traditional methods of solution. Examined and improved search methods overt and covert network malfunctions, it made it possible to increase the efficiency of the procedure of diagnosis by ensuring appropriate depth troubleshooting, reduce complexity and reduce the time spent searching for overt and covert network faults.
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Hawkins, Steve. "An internship in technical and scientific communication with Dell Inc." Oxford, Ohio : Miami University, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1070562313.
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Panero, Jan C. "Troubleshooting by computer advisors: A descriptive field study." Thesis, 1997. http://hdl.handle.net/1911/17118.
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Telephone conversations between software technical support advisors and their clients were recorded and analyzed. The roles the advisors took in the conversations influenced how much control each conversant had and the kind of contributions they made. When the advisors took the role of solving a problem, they had more control and asked more questions than in other roles. The conversations where the advisors acted as problem solvers were analyzed qualitatively in light of the problem-solving theories such as information processing theory, Gestalt theory, and schema/frame theory. Most technical support problem solving was explainable using Gestalt and frame theory, but some behavior was displayed that was not predicted by these theories. A model describing the prototypical technical support problem-solving case is presented, along with descriptive findings about flexible behavior in non-prototypical cases.
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Wu, Yen-Kang, and 吳彥慷. "Developing A Knowledge-Intensive FAQ System For Computer Troubleshooting." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/92778222701349473086.
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碩士<br>中原大學<br>資訊管理研究所<br>99<br>With information technology progress, computers exist with different type in the world. By the Internet, computers can bring more convenience in our daily life. With computers’ problems arising, people will do lots of things by computers. So, solving the problems are the first important things. In this study, we develop a FAQ system to solve it with different knowledge, including computer construction, testing methods and troubleshooting.
We use knowledge-oriented approach to define the require information for FAQ system. By using knowledge, we establish knowledge framework and information limit. In addition, this study also develops inference rules to provide solutions to users. Finally, we develop Web-based system interfaces that allow users to use the system through a familiar way. The domain experts can use the Web interfaces to maintenance knowledge base. This study not only provides the solution of computers’ problems, but also achieves a durable knowledge base and a reliable system.
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Yang, Liang-Kai, and 楊量凱. "A Study of Implementing Problem-Based Learning in Computer Troubleshooting Instruction." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/31148338882142569793.
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碩士<br>國立臺灣師範大學<br>工業教育學系<br>93<br>In order to apply Problem Based Learning to enhance Industrial Education quality, this study selected “computer troubleshooting” as experimental instruction course to test its effectiveness. Twenty sophomore students in Industrial Education Department of NTNU were selected to participate in this study. The effectiveness was evaluated through student homework, problem-based learning checking table, portfolio of studying and satisfaction survey. Further, six participants were selected for an in-depth interview. The following conclusions were drawn through statistic analysis:
1. Students can effectively develop logical thoughts for solving problems with “System Analysis” method in PBL.
2. The strategies of PBL can maintain learning motivation and assist to resolve the problems in life.
3. The participation attitude is in correlation to the depth of problem solving discussion.
4. The more the data collected for PBL influence the depth of PBL discussion directly.
5. Several aspects impact the student learning achievement such as tutor’s scoring method, their ability to guide, team leader’s leadership, the teammate cooperation and the individual’s attitude.
6. Students need to discuss one problem for several times to gain a solution and achieve the consensus.
7. Several impact factors to the portfolio are : 1) Learning situation description 2) Learning guidance 3) New information supply
4) Supplement material supply.
8. Factors affects learning progression are as:
1) Prior knowledge and personal experience
2) Individual assignments
3) Method of data collection
4) Tutor’s involvement with guidance
5) Team leader’s leadership
6) Discussion participation
7) Length of learning period
8) Evaluation method
Keywords: Problem-Based Learning, Computer Troubleshooting, portfolio