Despite recent advances in wireless local area network (WLAN) technologies, today's WLANs still cannot offer the same data rates as their wired counterparts. The throughput problem is further aggravated in multi-hop wireless environments due to collisions and interference caused by multi-hop routing. Because all current IEEE 802.11 physical (PHY) standards divide the available frequency into several orthogonal channels, which can be used simultaneously within a neighborhood, increasing capacity by exploiting multiple channels becomes particularly appealing. To improve the capacity of wireless ad hoc networks by exploiting multiple available channels, I propose three principles that facilitate the design of efficient distributed channel assignment protocols. Distributed channel assignment problems have been proven to be <i>NP</i>-complete and, thus, computationally intractable. Though being a subject of many years of research, distributed channel assignment remains a challenging problem. There exist only a few heuristic solutions, none of which is efficient, especially for the mobile ad hoc environment. However, protocols that implement the proposed design principles are shown to require fewer channels and exhibit significantly lower communication, computation, and storage complexity, compared with existing approaches. As examples, I present two such protocols that build on standard reactive and proactive routing protocols. In addition, I prove the correctness of the algorithms and derive an upper bound on the number of channels required to both resolve collisions and mitigate interference. A new multi-channel medium access control (MC-MAC) protocol is also proposed for multi-hop wireless ad hoc networks. MC-MAC is compatible with the IEEE 802.11 medium access control (MAC) standard and imposes the minimum system requirements among all existing multi-channel MAC protocols. In addition, simulation results show that even with only a single half-duplex transceiver, MC-MAC, by exploiting multiple channels, can offer up to a factor of four improvement in throughput over the IEEE 802.11 MAC protocol. The reduction in delay is even more significant. Therefore, the MC-MAC protocol and the accompanying distributed channel assignment protocols constitute an effective solution to the aforementioned performance problem in a multi-hop wireless network. Finally, I generalize the cross-layer design principle to more general networking functions and present a network architecture to motivate and facilitate cross-layer designs in wireless networks. A literature survey is provided to validate the proposed cross-layer design architecture. Current cross-layer design research can be categorized into two classes: joint-layer design using optimization techniques, and adaptive techniques based on system-profile and/or QoS requirements. Joint-layer design based on optimization techniques can achieve optimal performance, but at the expense of complexity. Adaptive schemes may achieve relatively good performance with less complexity. Nevertheless, without careful design and a holistic view of the network architecture, adaptive schemes may actually cause more damage than benefit. / Ph. D.

Cognitive radio (CR) is seen as one of the enabling technologies for realizing a new regulatory spectrum management paradigm, viz. opportunistic spectrum sharing (OSS). In the OSS paradigm, unlicensed users (a.k.a. secondary users) opportunistically operate in fallow licensed spectrum on a non-interference basis to licensed users (a.k.a. incumbent or primary users). Incumbent users have absolute priority in licensed bands, and secondary users must vacate the channel where incumbent user signals are detected. A CR network is composed of secondary users equipped with CRs and it can coexist with incumbent users in licensed bands under the OSS paradigm. The coexistence between incumbent users and secondary users is referred to as incumbent coexistence, and the coexistence between CR networks of the same type is referred to as self-coexistence. In this dissertation, we address three coexistence-related problems at the medium access control (MAC) layer in CR networks: (1) the rendezvous (control channel) establishment problem, (2) the channel assignment problem in an ad hoc CR network, and (3) the spectrum sharing problem between infrastructure-based CR networks, i.e., the 802.22 wireless regional area networks (WRANs). Existing MAC layer protocols in conventional wireless networks fail to adequately address the key issues concerning incumbent and self coexistence that emerge in CR networks. To solve the rendezvous establishment problem, we present a systematic approach, based on quorum systems, for designing channel hopping protocols that ensure a pair of CRs to "rendezvous" within an upper-bounded time over a common channel that is free of incumbent user signals. In a single radio interface, ad hoc CR network, we propose a distributed channel assignment scheme that assigns channels at the granularity of "segments" for minimizing the channel switching overhead. By taking into account the coexistence requirements, we propose an inter-network spectrum sharing protocol that enables the sharing of vacant TV white space among coexisting WRANs. Our analytical and simulation results show that these proposed schemes can effectively address the aforementioned MAC layer coexistence problems in CR networks. / Ph. D.

The goal of this Ph.D. research is to explore the IPD contractual strategies, to highlight the elements that distinguish IPD from a traditional delivery approach, to analyze how trust-based relationships are established and promoted, and to demonstrate if/how trust and IPD contractual principles correlate. The result of this research will promote the understanding of the industry on the strategies that promote trust and integration through real world case studies. The significance of the subject becomes more evident when reflecting on the current industry's crisis: productivity loss, fragmented delivery process, and lack of trust and collaboration. Through a literature review a Project Delivery and Contracting Strategies (PDCS) framework, an IPD traits framework, and a trust-Building framework are developed. The frameworks are used as the organizational tools to structure and inquire relevant information on the two IPD projects. An expert panel is assembled to discuss the frameworks and the findings of literature analysis and to seek the industry's insight on the units of analysis for contract, and the units of measure for trust. The units of analysis for contract are elements, such as strategies for risks/rewards sharing, liability considerations, decision making authority, and governance. The units of measure for trust are the individuals' perception, and the trust-building attributes as outlined in table 4-1. Two IPD projects were selected and their contract agreements were studied. A questionnaire including both open-ended questions and multiple choice questions was developed based on the information collected through: 1. the IPD agreements in each case study, 2. the literature-based frameworks on trust and project delivery contracting strategies. Accordingly, two IPD case studies are developed following the analysis of their IPD agreements and the individual one-on-one interviews with their key IPD players. The trust-building framework presented in this work includes a series of techniques that the contracting parties can follow when establishing their contractual and managerial strategies and also when interacting with each other. / Ph. D.

This doctoral thesis represents pioneering research in integrating Smart Mobile Lockers with City Buses (SML-CBs) for e-commerce last-mile delivery, a novel concept rooted in the sharing economy. It explores the innovative use of underutilized urban bus capacities for parcel transportation while incorporating smart parcel lockers to facilitate self-pick-up by customers. Comprising six chapters, the thesis delineates its background, motivations, contributions, and organization in Chapter 1. Chapter 2 presents a comprehensive review of the recent literature on last-mile freight deliveries, including a bibliometric analysis, identifying gaps and opportunities for SML-CBs intervention. In Chapter 3, using survey data, we conduct empirical analytics to study Canadian consumers’ attitudes towards adopting SML-CBs, focusing on deterrents such as excessive walking distances to pick-up locations and incentives led by environmental concerns. This chapter also pinpoints demographic segments likely to be early adopters of this innovative delivery system. To address the concerns over walking distances identified in Chapter 3, Chapter 4 presents a prescriptive model and algorithms aimed at minimizing customer walking distance to self-pick-up points, considering the assignment of SML-CBs and customers. The case study results endorse the convenience of SML-CBs in terms of short walking distances. To systematically assess the sustainability benefits, a key motivator identified in Chapter 3, Chapter 5 includes analytical models for pricing and accessibility of SML-CBs. It also employs a hybrid life cycle assessment (LCA) methodology to analyze the sustainability performance of SML-CBs. It establishes system boundaries, develops pertinent LCA parameters, and illustrates substantial greenhouse gas (GHG) savings in both operational and life cycle phases when SML-CBs are utilized instead of traditional delivery trucks. The dissertation is concluded in Chapter 6, summarizing the principal contributions and suggesting avenues for future research. This comprehensive study not only provides empirical and analytical evidence supporting the feasibility and advantages of SML-CBs but also contributes to the literature on sustainable logistics and urban freight deliveries. / Thesis / Doctor of Philosophy (PhD) / This doctoral thesis represents pioneering research in integrating Smart Mobile Lockers with City Buses (SML-CBs) for e-commerce last-mile delivery. It explores the innovative use of underutilized urban bus capacities for parcel transportation while incorporating smart parcel lockers to facilitate self-pick-up by customers. Comprising six chapters, the thesis delineates its background, motivations, contributions, and organization in Chapter 1. Chapter 2 presents a comprehensive review of the recent literature on lastmile freight deliveries. In Chapter 3, we study Canadian consumers’ attitudes towards adopting SML-CBs, focusing on deterrents such as excessive walking distances to pickup locations and incentives led by environmental concerns. To address the concerns over walking distances identified in Chapter 3, Chapter 4 presents models and algorithms for operating SML-CBs. Chapter 5 presents an assessment of the sustainability of SML-CBs. The dissertation is concluded in Chapter 6, summarizing the principal contributions and suggesting avenues for future research.

An increase in demand for sawed wood products is the reason why Norra Timber has to expand their facility at Sävar Sawmill. During the expansion, a new log sorting will be implemented which can sort timber with different characteristics and qualities compared to the current log sorting. The placement of the new log sorting and the logistics after the construction has not been decided. Therefore, the purpose of this thesis is to suggest a design of the new timber yard which includes placement of the new log sorting, log piles and roads to minimize travel distance for tractors between the log sorting and the saw. The thesis project started with examining the opportunities and challenges that exist in timber logistics through a literature study. Afterwards, the current logistics at Sävar Sawmill were studied. Relevant data was collected to create different layout suggestions and to determine which optimization model that should be used. The placement of the log sorting was determined after the data collection, together with a steering group at Sävar Sawmill. Three layout suggestions were created after the placement of the new log sorting and were restricted to the current asphalted surface for timber handling. All layout suggestions should have a storage capacity with the volumes 15 000 m3f, 20 000 m3f and 35 000 m3f. The unit of volume m3f, describes the solid volume of timber without bark. The assignment problem with the Hungarian algorithm was used to optimize the placement of log classes on the timber yard. Thereafter transport distances and driving hours were calculated with three different production levels. The results show that all timber fits in the timber yard for the three layout suggestions when the storage levels are 15 000 m3f and 20 000 m3f, where an optimal solution is found. In the beginning it was not possible to find an optimal solution when the storage levels increased to 35 000 m3f. To find a solution, one constraint was relaxed that allowed the log piles to become overfilled. Norra Timber did not believe a solution at 35 000 m3f existed and therefore accepted the relaxation. Layout suggestion 1 had the least amount of overfilled log piles and layout suggestion 2 had the most. There was a significant difference for the travel distance per year between the layout suggestions when the storage level was low compared to high. Layout suggestion 1 had the longest travel distance per year and layout suggestion 3 had the shortest for all the production levels. The positions and the number of log piles will be the same regardless the production levels, but the travel distance will increase when the production level increases. The number of driving hours is calculated from the travel distances to point out the differences in working hours for the tractor drivers. Layout suggestion 3 will be proposed to use in the future based on the result from the optimization model. The layout suggestion 3 has significant shorter transport distance for the two lower storage levels compared to the other suggestions. The tractor drivers also appreciated that layout suggestion 3 had more available log piles and that the placement of the log piles will ease their daily work and save many working hours. / En ökad efterfrågan på sågade trävaror gör att Norra Timber är i behov av att expandera sin nuvarande anläggning på Sävar såg. Vid expansionen kommer en ny timmersortering installeras som kan sortera timret på flera egenskaper och kvaliteter jämfört med den befintliga. Varken placeringen av den nya timmersorteringen eller hur logistiken ska fungera efter expansionen är bestämt. Syftet med examensarbetet är att ta fram ett förslag på hur Norra Timber ska designa området med placering av den nya timmersorteringen, vältplatser och vägar för att minimera transportavstånd för traktorerna mellan timmersorteringen och sågen.  Examensarbetet inleddes med att undersöka vilka möjligheter och utmaningar som finns inom timmerlogistik genom en litteraturstudie. Logistiken på Sävar såg studerades sedan och varje aktivitet förklarades i en nulägesbeskrivning. Relevant fakta samlades in för att kunna skapa olika designförslag och avgöra vilken optimeringsmodell som skulle användas. Efter datainsamling bestämdes placeringen av den nya timmersorteringen tillsammans med en projektgrupp på Sävar såg. Utifrån den nya timmersorteringens placering skapades tre olika designförslag som var begränsade till den asfalterade ytan vid den nuvarande timmerhanteringen. Alla designförslag skulle klara av en lagernivå på 15 000 m3f, 20 000 m3f och 35 000 m3f. Volymenheten m3f står för den fasta volymen timmer utan bark. För att optimera var timmerklasserna skulle placeras i vältor på timmerplanen användes tillordningsproblemet med Hungarian algoritm där indatat anpassades efter lager- och produktionsnivå. Transportavstånd och körtimmar räknas sedan ut för alla designförslag med tre olika produktionsnivåer.   Resultatet visar att när lagernivåerna är 15 000 m3f och 20 000 m3f får allt timmer plats på timmerplanen i alla designförslag och modellen hittar en optimal lösning. När lagernivån ökade till 35 000 m3f kunde inte en optimal lösning hittas till en början. För att hitta en lösning relaxerades ett bivillkor vilket gjorde att överfulla vältor tilläts. Norra Timber trodde inte en lösning vid 35 000 m3f existerade och accepterade därför relaxationen. Minst antal överfulla vältor hade designförslag 1 och designförslag 2 hade högst antal. Designförslagens transportavstånd per år skiljer sig mycket mellan den lägsta lagernivån jämfört med den högsta. Designförslag 1 har längst avstånd och designförslag 3 har kortast avstånd för alla lagernivåer. Oavsett vilken produktionsnivå sågen har kommer vältplaceringarna att vara samma för ett designförslag där endast den totala körsträckan ökar. Antal körtimmar beräknas utifrån transportavstånd och presenteras för att visa på skillnaderna mellan traktorförarnas arbetstid. Utifrån optimeringsmodellens resultat rekommenderas Norra Timber att designa den nya timmerplanen på Sävar såg efter designförslag 3. Förslaget har signifikant kortare transportavstånd vid de två lägre lagernivåerna jämfört med de andra två designförslagen. Traktorförarna uppskattade också att förslaget hade fler vältplatser och vältornas placering som kommer underlätta deras vardagliga arbete och spara in många arbetstimmar.

Denna studie är kvalitativ med intervjuer och litteraturstudier. Syftet har varit att undersöka läroplanen och uppdraget hos några anställda som har som målgrupp ”elever i behov av särskilt stöd”. Lärarna har inte likadan vidareutbildning. Min uppsats handlar om en del av den utbildning som finns för att kunna arbeta med elever i behov av särskilt stöd. De teoretiska utgångspunkterna är allmänna och gäller även för lärare med grundutbildning. Läroplanen, Lgr 11, griper tag i texten genomgående. Efter vidareutbildning för elever i behov av särskilt stöd kan man få många olika anställningar och uppdrag. Denna undersökning har belyst tre porträtt av två speciallärare och en specialpedagog. De har trots namnet inte samma uppdrag, men i vissa avsnitt har de vissa likheter. I intervjuerna framkommer att alla tre arbetar med elever i behov av särskilt stöd och den mesta undervisningen är organiserad på det viset att den är enskild. Alla tre, fyra med ett bortfall, arbetar på samma skola på landsbygden, dvs inte i storstadsområde. De ser möjligheterna med sitt uppdrag, men det är inte alltid som kunskaperna och kompetensen får chans att komma fram. I resultatredovisningen och analysen blir det tydligt att det finns något karakteristiskt med de lärare som vidareutbildar sig för uppdrag med elever i behov av särskilt stöd. Jag vill dock påpeka att detta är endast tre lärares uppfattning. Teoriavsnittet, med läroplanen som övergripande styrdokument, är valt för att läroplanen är så pass ny att den ännu inte har hunnit implementeras i skolorna, medan man säger att den är en del av uppdraget. Alla tre har de erfarenhet av att ingå i skolans pedagogiska ledningsgrupp. Studien tar även upp förväntningar med utbildning och anställning hos de intervjuade lärarna. En slutsats är: utbildning har betydelse både för att utföra uppdraget och för att få uppdraget. / This study is based on qualitative interviews and literature studies. The aim was to examine the mission statement of teachers who have been targeting “students in need of special support”. The teachers do not have the same training. My essay is about teacher training available to work with pupils with special needs. The theoretical approach is general and also applies to teachers with basic training. The curriculum, LGR 11, grabs the text throughout. After education for pupils with special needs it is possible to have many different jobs and assignments. This study has highlighted three portraits of specially educated teachers. They have, despite the name, not the same mission, but in some sections they have some similarities. The interviews reveal that all three are working with pupils with special needs and most of the teaching is organized in the sense that it is individual. All three, four with a dropout, are working at the same school in a rural area, that is, not in a metropolitan area. They see the potential of their mission, but it is not always that knowledge and expertise have the chance to surface. In the performance reporting and analysis, it becomes clear that there are a characteristic of the teachers in training for the mission with students in need of special support. I would point out that this is only three teachers' perception. Theory section, with the curriculum as an overall policy documents, is chosen as the curriculum is so new that it still had yet to be implemented in schools, while it is part of the mission. All three have experience to be part of the school's educational team. The study also outlines expectations with education and employment with the informants. One conclusion is that education is important both for performing the task and to get the assignment.

<p>Sammanfattning</p><p>Syftet med den här undersökningen är att ta reda på hur barns tankar kring ekologiska processer kan utvecklas, samt att ta reda på vad i undervisningen som anses vara avgörande för att förmå barn att utveckla sina ekologiska reflektioner. Kvalitativa intervjuer och ett undervisningstillfälle ligger till grund för undersökningen. Därefter sammanställdes och kategoriserades barnens ekologiska processtankar. Resultatet av undersökningen visar att förutsättningen för utvecklande undervisning, är pedagogens kännedom om barnets individuella erfarenheter. Det är utifrån dessa som barnet tar emot ny kunskap och sedan kopplar ihop den med tidigare upplevelser. Ett kort undervisningstillfälle resulterade i att sju av åtta barn kompletterade sina kunskaper och deras tankar om processen utvecklades i flera steg.</p><p>Min slutsats utifrån denna granskning är att ålder och mognad inte är avgörande för ett barns förmåga att utveckla kunskap. Då barnets erfarenheter förvaltas och betraktas som tillgångar, kan tankarna utmanas och en utveckling ske.</p> / <p>Abstract</p><p>The intention of this investigation is to find out how to develop children’s way of thinking about ecological processes and to pinpoint decisive steps to develop an ecological mind. The concluded material is based on qualitative interviews and one lesson with a class. The material is assembled and categorized based on the children’s ecological process logic. The result of this investigation shows that the prerequisite for developing tuition is the teacher’s knowledge of the children’s individual experience. Based on these the child will be able to take in new knowledge and relate it to earlier experiences. A short lesson based on the above showed that seven out of eight children increased their knowledge with improved ecological thoughts in several steps as a result.</p><p>My conclusion from this investigation is that age and maturity alone is not of crucial importance to children’s ability to develope their knowledge. With the use of the child’s experiences as assets the mind can be challenged and development can take place.</p>

The research assessed the potential of developing a selective breeding programme for the UK rainbow trout industry. Levels of genetic variation at 12 microsatellite loci were first compared in seven different commercial strains. The Observed heterozygosity ranged from Ho = 48.1% in a gold rainbow trout strain (GTR) to Ho = 66.4% in a newly derived broodstock population constructed from a number of different sources (GIT). The Expected Heterozygosity (He) was highest in GIM1 (He= 79.5%) and lowest in the GTR strain (He = 56.9%). The Effective number of alleles (Mae) showed that the GIM1, GIM2, GIM3, and GIT strain (5.4; 5.2; 4.8; 4.2) were significantly more variable than the other strains and that GTR strain had the lowest value (2.5). There appears to be substantial genetic variability within the commercial United Kingdom rainbow trout strains surveyed in this study. This appears to be the case despite very different management histories and levels of record keeping. The strains appear to be genetically distinct (based on population genetic analyses), though the reasons for this remain unclear (and possibly unanswerable given the poor records kept by the different companies). The Glenwyllin farm strains (GIM) were chosen to form the base population for the project because of their high genetic variability, disease free status and because the farm produced around 20 million ova per year, so any genetic gains would have a widespread impact. The farm has an early (Strain A) and a late spawning (Strain B) and these were mated in a partial factorial design, 20 females and 20 neomales per strain (A & B) were chosen on the basis of maturity and gamete quality in November 2002 so that each male was crossed to 4 females (2 in the same strain and 2 in the other), a total of 160 families were created. All broodstock were biopsied to enable them to be genotyped. The families were reared separately up to the eyed stage at which point the eggs from each family were divided into three to generate three communal replicate populations. One of these was sent to a fingerling producer (Iwerne Spring) for ongrowing to fingerling size and formed the basis of a commercial production trial at Test Valley Trout farm (TVT) in Hampshire. When the fish reached an average weight of 5 g they were transferred from Iwerne Spring to TVT and 1500 were randomly selected, PIT tagged and biopsied to enable them to be assigned to their family using 11 multiplexed microsatellite loci. Parental assignment was based on exclusion (FAP) but the results were compared with another parental assignment based on likelihood (PAPA). Of the 1500 offspring (OIM) PIT tagged 1242 82.8% could be assigned to a single family utilizing different combinations of more than 6 loci (6 to 11). The growth of the 1500 OIM fish was tracked throughout the grow out period before they were finally harvested and fully processed. The results of OIM strain at the end of the trial period were mean weight of 415.5 g, and a mean length of 314.5 mm. The visual measurement of colour gave a mean flesh colour values of 26.01 on the 20-34 scale (SalmoFan™), and 11.0 with the colotimetry evaluation of colour (a*). The heritability results for the IOM strain were 43 ± 9% for weight, 42 ± 9% for gutted, and 28 ± 8% for length. The heritability estimates for the visual colour variables were 19 ± 7% and when using the colorimeter, the red chromaticity (a*) heritability was 14 ± 6%. Therefore, the heritability results of the IOM strain indicate that there are opportunities of substantial and rapid improvement of the growth rate and flesh colour traits. Also no line effects were observed or indications of non-additive genetic variation. In contrast to these last results, the overall survival of the GIM strain from the time of the physical tagging with PIT until harvest was 52.8%, and survival heritability was extremely low, 3 ± 2%, hardly significant.

Les conditions de circulation sur un réseau routier subissent souvent de la congestion. Selon ses sources, la congestion routière peut être classée en deux catégories : la congestion récurrente déterminée par les lois de trafic et la congestion non-récurrente due aux incidents, accidents ou autres aléas sur la route. Grâce à l'avancement des technologies, notamment en informatique, communication et techniques de traitement des données, l'exploitant est devenu capable de détecter les perturbations, de mesurer les effets et même d'anticiper l'état du trafic afin de mieux adapter ses actions d'exploitation. L'information dynamique concernant les conditions de trafic permet aux usagers de réduire l'inconfort et d'effectuer leur choix d'itinéraire de manière plus raisonnable. Pour l'exploitant, le service d'information aux usagers peut servir à la gestion du trafic. Nous avons étudié la contribution potentielle de l'information dynamique au profit individuel des usagers et à la performance collective du système en prenant en compte : i) la congestion récurrente et non-récurrente ; ii) des différents comportements de choix d'itinéraire en fonction de l'accessibilité à l'information ; iii) d'autres actions de gestion du trafic menées par l'exploitant. Un modèle théorique avec une application analytique sur un réseau élémentaire de deux routes parallèles, une paire origine-destination et deux classes d'usagers respectivement informée ou non-informée nous a permis de retirer de nombreuses indications : i) la diffusion excessive de l'information avec un contenu « neutre » dégrade à la fois le profit individuel et la performance du système ; ii) l'information dynamique avec certain contenu « coopératif » peut contribuer l'optimisation du système sans causer le problème d'acceptabilité ; iii) l'information dynamique et d'autres mesures de gestion dynamique s'interagissent de manière complémentaire à l'optimisation du trafic / Traffic conditions on a road network often suffer from congestion. According to sources, the traffic congestion can be classified into two categories : recurrent congestion determined by the physic laws of traffic and non-recurrent congestion due to incidents, accidents or other hazards on the road. Thanks to the advancement of technologies, including computers, communications and data processing, the traffic operator is now able to detect disturbances, to measure the effects and even to anticipate traffic conditions to better match traffic management activities. Dynamic information on traffic conditions enables users to reduce discomfort and make their route choice decision more reasonable. For the operator, the service user information may be used as a traffic management tool. We investigated the potential contribution of dynamic traffic information for the benefit of individual users and system performance by taking into account : i) recurring congestion and non-recurring ; ii) different route choice behaviours based on accessibility to information service ; iii) other traffic management actions taken by the traffic operator. A theoretical model with an analytical application on a simple two-parallel-road network, an origin-destination pairs and two user classes, respectively-informed or non-informed has given many conclusions : i) an excessive distribution of traffic information with a « neutral » content damages both the individual profit and system performance ; ii) traffic information with some « cooperative » content may help optimize the system performance without causing acceptability problem ; and iii) dynamic information and other traffic management tools interplay in a complementary manner to optimize the traffic

<p>Polazeći od prostog aukcijskog algoritma (SAP) za izbor izvršioca u<br />bežičnim senzorskim i aktuatorskim mrežama u ovoj disertaciji su<br />uvedena dva poboljšanja tog algoritma (multi-hop komunikacija i<br />lokalizacija). Predloženo je i pet novih aukcijskih agregacionih<br />algoritama koji koriste tehniku agregacije da bi smanjili<br />komunikacione troškove. Treća grupa doprinosa ove disertacije se<br />odnosi na primenu aukcija za poboljšanje postojećeg iMesh algoritma<br />za pronalaženje izvršioca. Eksperimentalni rezultati pokazuju<br />svojstva algoritama i njihove prednosti u odnosu na postojeće.</p> / <p>Two improvements of the simple auction protocol (SAP) for the task<br />assignment in wireless sensor and actuator networks is proposed in this<br />dissertation (multi-hop communications and localization). Five new auction<br />aggregation algorithms for the task assignment are proposed with the goal to<br />minimize the communication costs. One of the auction aggregation algorithms<br />is also used to improve existing iMesh service discovery algorithm.<br />Experimental results show the characteristics of the proposed algorithms and<br />advantages over the existing ones.</p>