Information delivery via the web has become very popular. Along with a growing user population, systems increasingly are supporting content that changes frequently, personalised information, and differentiation and choice. This thesis is concerned with the design and evaluation of resource management strategies for such systems. An architecture that provides scalability through caching proxies is considered. When a cached page is updated at the server, the cached copy may become stale if the server is not able to transmit the update to the proxies immediately. From the perspective of the server, resources are required to transmit updates for cached pages and to process requests for pages that are not cached. Analytic results on how the available resources should be managed in order to minimise staleness-related cost are presented. An efficient algorithm that the server can use to determine the set of pages that should be cached and a policy for transmitting updates for these pages are also presented. We then apply these results to page fragments, a technique that can provide increased efficiency for delivery of personalised pages.

Information delivery via the web has become very popular. Along with a growing user population, systems increasingly are supporting content that changes frequently, personalised information, and differentiation and choice. This thesis is concerned with the design and evaluation of resource management strategies for such systems. An architecture that provides scalability through caching proxies is considered. When a cached page is updated at the server, the cached copy may become stale if the server is not able to transmit the update to the proxies immediately. From the perspective of the server, resources are required to transmit updates for cached pages and to process requests for pages that are not cached. Analytic results on how the available resources should be managed in order to minimise staleness-related cost are presented. An efficient algorithm that the server can use to determine the set of pages that should be cached and a policy for transmitting updates for these pages are also presented. We then apply these results to page fragments, a technique that can provide increased efficiency for delivery of personalised pages.

<p>Abstract: The purpose of this study was to examine the process of overtraining syndrome as a part of development in sports and careers. It is based on theories about overtraining syndrome and athlete career transitions. The intention was to find patterns that illustrate critical factors in the athlete career for overtraining syndrome to occur, but also for preventing overtraining syndrome to emerge and for rehabilitation.</p><p>The Informant was a 19 years old man who had completed his studies at a Swedish sports-“gymnasium”. Two semi structured interviews were made, the second as a following up interview. The material was analysed by a qualitative content analysis including a constant comparing method. </p><p>The result showed that the Informant developed an overtraining syndrome during his first year as an elite junior athlete at the sports-“gymnasium”. It took one year from the occurrence of the first symptoms until initiating interventions and a second year of rehabilitation before the Informant was totally recovered. Imbalance in the stress-recovery process because physiological and psychological sports demands as well as lack of cognitive skills was possible factors for the beginning of the overtraining syndrome. Factors for preventing origination were the Informants motivation, cognitive skills along with social support.</p><p>In summary it is proposed to focus on interaction between models and theories about overtraining syndrome and athletic career transitions, in purpose to prevent overtraining syndrome to occur when young athletes transcend to high achievement junior sports, including its structure.</p><p>Sammanfattning: Syftet med studien var att studera processen för överträningssyndrom som en del i idrotts- och karriärutvecklingen utifrån teorier om överträningssyndrom och idrottskarriärövergångar. Avsikten var att finna mönster som belyste faktorer och kritiska skeden i idrottskarriären för att överträningssyndrom ska uppstå samt för att förhindra detta och underlätta rehabilitering.</p><p>Informant var en 19 årig man som avslutat tre års studier på idrottsgymnasium. </p><p>Två semistrukturerade intervjuer genomfördes, den senare intervjun som uppföljningsintervju. Materialet analyserades genom kvalitativ innehållsanalys med en konstant jämförande metod. Resultaten visade att under det första året som elitidrottande junior på idrottsgymnasium utvecklade Informanten ett överträningssyndrom. Det tog ett år från att första symtomen uppmärksammades till att intervention påbörjades och ytterligare ett års rehabilitering innan Informanten var helt återställd. Tänkbara orsaker till uppkomsten var obalans i stress-återhämtningsprocessen, framförallt beroende på idrottsliga fysiska och psykologiska krav och brist på kognitiva förmågor. Faktorer för att förhindra uppkomst och i rehabilitering antas vara Informantens motivation och kognitiva förmågor samt socialt stöd. </p><p>Sammantaget antas att interaktion mellan modeller och teorier om överträningssyndrom och idrottskarriärövergångar ska ses som en helhet i syfte att förhindra uppkomst av överträningssyndrom då unga idrottare övergår till högpresterande junioridrott och dess struktur.</p>

Abstract: The purpose of this study was to examine the process of overtraining syndrome as a part of development in sports and careers. It is based on theories about overtraining syndrome and athlete career transitions. The intention was to find patterns that illustrate critical factors in the athlete career for overtraining syndrome to occur, but also for preventing overtraining syndrome to emerge and for rehabilitation. The Informant was a 19 years old man who had completed his studies at a Swedish sports-“gymnasium”. Two semi structured interviews were made, the second as a following up interview. The material was analysed by a qualitative content analysis including a constant comparing method. The result showed that the Informant developed an overtraining syndrome during his first year as an elite junior athlete at the sports-“gymnasium”. It took one year from the occurrence of the first symptoms until initiating interventions and a second year of rehabilitation before the Informant was totally recovered. Imbalance in the stress-recovery process because physiological and psychological sports demands as well as lack of cognitive skills was possible factors for the beginning of the overtraining syndrome. Factors for preventing origination were the Informants motivation, cognitive skills along with social support. In summary it is proposed to focus on interaction between models and theories about overtraining syndrome and athletic career transitions, in purpose to prevent overtraining syndrome to occur when young athletes transcend to high achievement junior sports, including its structure. Sammanfattning: Syftet med studien var att studera processen för överträningssyndrom som en del i idrotts- och karriärutvecklingen utifrån teorier om överträningssyndrom och idrottskarriärövergångar. Avsikten var att finna mönster som belyste faktorer och kritiska skeden i idrottskarriären för att överträningssyndrom ska uppstå samt för att förhindra detta och underlätta rehabilitering. Informant var en 19 årig man som avslutat tre års studier på idrottsgymnasium. Två semistrukturerade intervjuer genomfördes, den senare intervjun som uppföljningsintervju. Materialet analyserades genom kvalitativ innehållsanalys med en konstant jämförande metod. Resultaten visade att under det första året som elitidrottande junior på idrottsgymnasium utvecklade Informanten ett överträningssyndrom. Det tog ett år från att första symtomen uppmärksammades till att intervention påbörjades och ytterligare ett års rehabilitering innan Informanten var helt återställd. Tänkbara orsaker till uppkomsten var obalans i stress-återhämtningsprocessen, framförallt beroende på idrottsliga fysiska och psykologiska krav och brist på kognitiva förmågor. Faktorer för att förhindra uppkomst och i rehabilitering antas vara Informantens motivation och kognitiva förmågor samt socialt stöd. Sammantaget antas att interaktion mellan modeller och teorier om överträningssyndrom och idrottskarriärövergångar ska ses som en helhet i syfte att förhindra uppkomst av överträningssyndrom då unga idrottare övergår till högpresterande junioridrott och dess struktur.

This work first implements a prototype of the proof-of-location scheme Vouch in order for an evaluation to be conducted in a real-world environment. With simulations of the scheme showing promising results, the next step would be an evaluation of the schemes performance in the real-world. This report introduces the scheme and similar works in relation to implementation and evaluation. Method of implementation is presented followed by an evaluation. The evaluation focuses on detection accuracy of the scheme by investigating impacts of the inevitably arising staleness. Contributors of staleness are identified and their impacts on overall detection accuracy of Vouch are measured. With the prototype successfully implemented, measurements showed a trend in improving detection accuracy with higher proof update frequencies, reaching as high as 9̃5% in a high velocity environment. The results shows that the Vouch scheme not only gives promising results in simulation, but also in the real-world.

Titrating training volume to optimize physical readiness and avoid training distress in swimmers is a difficult challenge for coaches. The purpose of this study was to examine alterations in mood state in collegiate swimmers throughout an entire season and determine if there were differences across time, between training groups, gender, and year in school. A swim test was also employed to determine if alterations in swim times were associated with mood disturbance. Mood state and the swim test times were measured every three weeks. The results showed significant alterations in total mood disturbance (TMD) across time; and between genders, year in school and training group. When training volume was the highest, TMD in the swimmers had the greatest perturbations. These time periods were also associated with small but significant increases in the swim test times. These results indicate that use of the Profile of Mood States Questionnaire and a physiological swim test may be useful for detecting training distress in swimmers. Swim coaches may benefit from employing either or both of these tools for designing and tailoring training sessions and tapering for optimal performance.