The amount of packets on-the-fly in a wireless ad-hoc network increases when the size of congestion window and the number of hop count increase. It is possible that packets may have to retransmit because large amount of on-the-fly packets may increase the media contention. Besides, packet delay can grow rapidly when the wireless network becomes congested or the channel interference remains unresolved. This thesis presents a cross-layer TCP congestion window control mechanism for multihop ad-hoc networks to dynamically adjust the size of congestion window according to the MAC-layer contention statistics measured at each hop along the routing path. With the proposed scheme, the congestion window of each traffic flow can be dynamically set to an appropriate size to reduce packet delay and increase flow throughput. For the purpose of evaluation, we perform simulations on NS-2. The simulation results have shown the advantage of our proposed scheme over the two previous works, NewReno and CWL(Congestion Window Limit), especially when the ad-hoc network is loaded with background traffic.

Abstract The public security is the key factor for a prosperous country; therefore, maintaining a safe social order has always been the most desirous expectation for the public. ¡§Community Policing¡¨ is the strategy to govern public social order, and how to apply its usage is the main stream on crime prevention and police beat is its main core. This study, by reviewing the basic theory of community policing, researching the operational practice domestically and abroad, rechecking the real state of community policing in Penghu, analyzing the recollected data, can be further shaped on its diversified location to develop a satisfactory living space and peaceful land for the Penghu people. By studying this subject, here my suggestions are as follows: ¢¹ Suggestions on community policing of Penghu. 1.Penghu people are quite satisfied with the public security but are still afraid of being stolen. We have to pay more attention on guiding how to prevent the civilian from being a burglar victim and lay emphasis on operational practices. 2.Penghu people are not willing to attend any meeting related to public affairs; the police has to stimulate and inspire the community consciousness of being a civilian by attending any activities or practicing census checks. 3.Implementing sole-duty-beat system can diminish most of the burden of policy duty, which can exclusively make the police more concentrative on doing the census check, providing service, and guiding crime prevention. 4.The success of community policing depends on ¡§close interaction between the civilian and the police; the police must offer high quality service to gain the trust of the civilian. Only by doing this can a close relationship be shaped and be dedicated on crime prevention. 5.The spirit of community policing is beat officer itself; therefore, in order to encourage the officer to persistently manage its beat with diligence and innovativeness, a system based on preventive guiding and service providing to assess the performance of the beat officers is highly requested. 6.While enforcing the community policing, the crucial point to success is decided by how to pass the decision-making to the beat officer, which can make them more flexible and responsive to the need of the community. 7.In hoping of the community policy strategy can keep flourishing, the government authority has to make budget for it and those responsible have to step into the community for a setting up a sound community policing. And the police authority has to make its goal and strategy clear and have a comprehensive communication with the beat officer to build a common consensus. Then , under the process of empowerment, the beat officer can become a member of the community. 8.Twenty-first century is the era of community policing, the police has to cooperate with the medium strategically to publicize the community consciousness, which, in the long run, can be beneficial to build a high quality living environment. . ¢ºSuggestions for follow-up research: 1.Research domain: increase to lay emphasis on community specialty, which can make the managerial strategy more specific and effective. 2.Research object: increase the number of community civilian specimen, which can promote its representation. 3.Research method: increase the observation method as auxiliary, which can be expected to be more adjustable to its location and occasion. 4.Empirical study evaluation : apply ¡§ equalized performance marking card¡¨ to assess the interior and exterior performance of the beat officer, which can be expected to excavate the underneath problems. Key words: community policing, police beat, window-breaking theory, crime prevention.

Given a string S = {a1, a2, a3, ..., an}, the longest increasing subsequence (LIS) problem is to find a subsequence of the given string such that the subsequence is increasing and its length is maximal. In a previous result, to find the longest increasing subsequences of each sliding window with a fixed size w of a given string with length n can be solved in O(w log log n+OUTPUT) time, where O(w log log n+ w^2) time is taken for preprocessing and OUTPUT is the sum of all output lengths. In this thesis, we solve the problem for finding the longest increasing subsequence of every substring of S. With the straightforward implementation of the previous result, the time required for the preprocessing would be O(n^3). We modify the data structure used in the algorithm, hence the required preprocessing time is improved to O(n^2). The time required for the report stage is linear to the size of the output. In other words, our algorithm can find the LIS of every substring in O(n^2+OUTPUT) time. If the LIS's of all substrings are desired to be reported, since there are O(n^2) substrings totally in a given string with length n, our algorithm is optimal.

The archaeological and technical questions about ancient glass have lead to various research activities such as identification and sourcing raw materials used in the glass production, investigation of the ways in which colors can be modified according to furnace atmosphere and times of firing. Considering research areas and publications it can be suggested that compositional studies of well-dated samples of ancient glass have disclosed useful information concerning raw materials characteristics and production technology. Within this context, aim of this study was to determine the composition and technology of some 13th century Seljuk period window glasses from Alanya Castle archaeological site. During the excavations at the area called Vaulted Galleria in Alanya Castle many glass pieces in different sizes and colors had been found. In this study 10 samples were examined. Elemental analysis of the samples have been made using two different methods / X-Ray Fluorescence Spectroscopy (XRF) and Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) to determine major, minor and some trace elements. The XRF and ICP-OES data reflect the typical composition of a soda-lime-silica glass with the average values of / 12.9% (Na2O): 7.7% (CaO): and 65.5% (SiO2). Samples were grouped by color as green, blue and purple. Color producing elements are Fe, Mn, Cu and Co. Most of the samples had shown casting character as production technique.

No description available.

IETF proposes the Differentiated Service(DiffServ) architecture for next-generation QoS networks. The main features of a DiffServ network are high scalability and compatibility. However, lacking of supporting QoS for individual flows becomes a problem. To remedy this problem, we propose an effective TCP transmission (ETCP) scheme based on the characteristics of TCP. The goal of this thesis is to make TCP transmission more effective. Because of the network complexity, we need to modify both the Ingress and Egress nodes. At Ingress node, we measure TCP congestion window(cwnd) and Round Trip Time(RTT), while at Egress node we monitor the throughput and embed a feedback ratio into TCP header of the acknowledge packets. When the throughput is below or over the target throughput, we adjust DSCP dynamically. The adjustment depends on both measured TCP congestion window and RTT. Each DSCP value is mapped with a delay time through Delayed-FIFO. Changing the delay time in Ingress node, we are able to control TCP transmission associated with RTT more effectively. For the purpose of the demonstration, we implement our scheme on Linux platform. We discuss the performance difference between the theoretical and practical results through experiments. Besides, from the implementation, we have shown that our proposed architecture is workable and compatible with today¡¦s network environment.

<p>This paper is an exploratory case study of a logistics cost problem at Dep. X, and the normative purpose is <strong>to develop a model for Dep. X to aid in solving the problem of large damage costs.</strong></p><p>Dep. X is the logistic department of a warehouse located in a midsized Swedish city. The warehouse is part of an international furniture chain that operates in more than 40 countries worldwide and has an annual turnover of 211 billion Swedish SEK. This company has a clear cost focus and therefore, it is very important for the different departments to keep costs at a minimum.</p><p>The problem that Dep. X is facing is related to damaged products, which can be further divided into Delivery Damages [DDs] (damages that are inflicted on products before the freight reaches the department) and Warehouse Damages [WDs] (damages that occur at the department). The warehouse has tried to solve the problem by forming a unit called ‘Cost hunters’. This group has some suspicions but has not yet found out the underlying reasons for the damaged goods. The thing that they know is that this is an unproportionally large cost for the warehouse, compared to other warehouses. In order for the researchers to investigate the cost issue, an abductive research strategy was used. The authors found out in an early stage of the research process that the problem was related to WDs and after a pre-study hypothesized four different problem areas to investigate:</p><ul type="disc"><li>Flaws in Communicating Knowledge</li><li>Flaws in Working Environment</li><li>Flaws in Motivation</li><li>Flaws Concerning Customers</li></ul><p>In order to establish whether or not these hypotheses were correct, a benchmarking study was conducted with a department under the same company, which was of basically the same size. Apart from the pre-study, a total of nine interviews were conducted; five at Dep. X and four at Dep. Y. The researchers also sent out surveys to both departments, conducted a damage levels study and had a meeting with a group manager at the distribution central in order to collect the needed information.</p><p>After data collection, the data were processed and analyzed, and the researchers came to the conclusion that the problem with high WDs at Dep. X was related to, firstly, flaws in communicating knowledge and flaws in the working environment. The two other problem areas, flaws in motivation and flaws concerning customers, were also to some extent related to WDs, but this impact was not considered enough to be a major cause. The authors finish the thesis by illustrating with a model how the problems seem to have arisen and by suggesting improvement areas to deal with in order to eliminate the cost issue.</p>

For investigations of ordered nanometre structures and for high-precision measurement of the atomic order in crystalline solids, X-ray diffraction is the most important tool. With the aid of X-ray microscopy, unordered and even living objects can also be imaged directly. The resolution of these images, applying different contrast techniques representing the state of the art, reaches the nanometre range. In the future, a synthesis of both methods could yield a shift of the spectral resolution down to the atomic level. / Für die Aufklärung geordneter Nanometer-Strukturen und die hochpräzise Vermessung der Atomanordnung in kristallinen Festkörpern ist die Röntgenstrahlbeugung das wichtigste Werkzeug. Mit Hilfe der Mikroskopie mit Röntgenstrahlung können auch ungeordnete und sogar lebende Objekte direkt abgebildet werden. Die Auflösung dieser Abbildungen unter Nutzung verschiedener Kontraste erreicht nach dem Stand der Technik gerade die Grenze des Nanometerbereiches. Für die Zukunft wird eine Synthese beider Methoden und so auch die weitere Verschiebung der Grenze der erreichbaren Auflösung erwartet.

The objective to this bachelor degree project was to redesign a structure of the doors and add windows of a convertible car. This was carried out in collaboration with the company Hurtan Desarrollos S.L. To establish the requirements for the design, initial studies were performed: a literature review, a benchmark of related products and a study of standard car door designs. After this the final requirements were defined and the concept generation design phase was begun. In this phase a number of design methods were applied. The design concepts were systematically evaluated in respect to if, and to what degree, the concepts met the defined demands and needs of the design. The final concepts were completed with the demands of the company to obtain the results. In order to define, create and communicate ideas and solutions, the design was modelled in Solidworks software and exported to Creo Parametric 2.0 to create the final renders. Once the overall design was defined, materials and accessories were specified. The final result is presented in detail in photorealistic renderings and a physical design made by Hurtan Desarrollos S.L.

Quantifying the drilling or recompletion potential in producing gas basins is often a challenging problem, because of large variability in rock quality, well spacing, and well completion practices, and the large number of wells involved. Complete integrated reservoir studies to determine infill potential are often too time-consuming and costly for many producing gas basins. In this work we evaluate the accuracy of a statistical moving-window technique that has been used in tight-gas formations to assess infill and recompletion potential. The primary advantages of the technique are its speed and its reliance upon well location and production data only. We used the statistical method to analyze simulated low-permeability, 100-well production data sets, then compared the moving-window infill-well predictions to those from reservoir simulation. Results indicate that moving-window infill predictions for individual wells can be off by more than 50%; however, the technique accurately predicts the combined infill-production estimate from a group of infill candidates, often to within 10%. We found that the accuracy of predicted infill performance decreases as heterogeneity increases and increases as the number of wells in the project increases. The cases evaluated in this study included real-world well spacing and production rates and a significant amount of depletion at the infill locations. Because of its speed, accuracy and reliance upon readily available data, the moving window technique can be a useful screening tool for large infill development projects.