This masters thesis is about mutlicast. There are explained 2nd and 3th layers of the ISO/OSI model multicast addressing. Routers in a network use multicast routing protocols to optimally route multicast packet through the network, this is also in this project. These multicast protocols are DVMRP, protocol PIM in his two modes, PIM Sparse Mode and PIM Dense Mode. Protocol DVMRP uses protocol IGMP, which is described as well. At practical section of this masters thesis is presented connections, by which tests was executed.

This dissertation is the culmination of extensive literature study on the application of Restorative Justice in the South African Correctional System. International and national resources on the application of Restorative Justice both in Corrections and as pre-sentence option had been studied. The background of the penal system and the development of Restorative Justice as part of the Criminal Justice System are investigated by looking at ancient practices, indigenous and modern practices. The study intends to draw on experience from other countries, while at the same time advocate for the development of a uniquely South African model or practice. The role of the most important stakeholders, namely victim, offender and community is emphasized with reference to the challenges that offenders face in terms of reintegration and the lack of resources in communities to enable them to honour Restorative Justice agreements. / Criminology / M. A. (Criminology)

Drug abuse is becoming an increasing problem in Kenya. A number of studies carried out in the country show that almost every Kenyan youngster at one time or another experiments with drugs, especially beer and cigarettes. The major cause of concern is that a significant proportion of these young people eventually get addicted posing a threat to their own health and safety, while creating difficulties for their families and the public at large into difficulties. This study sought to establish the current trend of drug abuse among students in Kenyan secondary schools, and to analyze the strategies used to address the problem. The ultimate aim was to propose a programme for prevention and intervention. The study is a descriptive survey. In view of this, the field survey method was adopted to collect quantitative and qualitative data, using questionnaires and interviews. Both qualitative and quantitative approaches were used in data analysis, thus there was a mixed model research design approach to data analysis. The analysis of structured items was mainly done using the Statistical Package for Social Sciences (SPSS). The key findings from the study were that drug abuse among students is common; both boys and girls have abused drugs with the majority being in boys‟ schools; the greatest ratio of drug abusers to non-abusers among the sampled schools are aged between 20 and 22 years; there is a significant relationship between drug abuse and age, use of drugs by other family members and easy access to drugs. A variety of factors contribute to drug abuse with the majority of students citing curiosity, acceptance by peers and ignorance as to the dangers of drug abuse as the main reasons. Both the school administrators and teachers face a number of challenges in an attempting to curb drug abuse in schools. The study makes a number of recommendations for policy and further research. A number of guidelines are proposed for developing a programme for prevention and intervention. / Educational Studies / D. Ed. (Socio-Education)

The present Master's thesis Development trends in Russian interpreting theory at the turn of the 20th and 21st centuries is a theoretical study dedicated to the current situation in the interpreting theory in the Russian Federation. The aim of the thesis is firstly to analyze the information available on the development of the Russian interpreting theory within the international context, research being carried out by the current Russian authors, universities providing education in both conference consecutive and simultaneous interpreting, professional organizations associating highly-qualified translators and interpreters, professional journals, and the situation on the market in the field of interpreting, and secondly to draw a conclusion regarding the overall present situation, its probable reasons and assumed future development. Besides the introductory and conclusive chapters, the thesis is divided into four parts. The first part describes the research resources of the Russian interpreting theory in the international interpreting studies context. The second part is focused on the main research fields of interest of the Russian authors in the initial formation phase of the interpreting theory as an independent scientific discipline. The object of the third part is a comparison of several...

Benefiting from the constant and significant advancement of wireless communication technologies and networking protocols, Wireless Ad hoc NETwork (WANET) has played a more and more important role in modern communication networks without relying much on existing infrastructures. The past decades have seen numerous applications adopting ad hoc networks for service provisioning. For example, Wireless Sensor Network (WSN) can be widely deployed for environment monitoring and object tracking by utilizing low-cost, low-power and multi-function sensor nodes. To realize such applications, the design and evaluation of communication protocols are of significant importance. Meanwhile, the network performance analysis based on mathematical models is also in great need of development and improvement. This dissertation investigates the above topics from three important and fundamental aspects, including data collection protocol design, protocol modeling and analysis, and physical interference modeling and analysis. The contributions of this dissertation are four-fold. First, this dissertation investigates the synchronization issue in the duty-cycled, pipelined-scheduling data collection of a WSN, based on which a pipelined data collection protocol, called PDC, is proposed. PDC takes into account both the pipelined data collection and the underlying schedule synchronization over duty-cycled radios practically and comprehensively. It integrates all its components in a natural and seamless way to simplify the protocol implementation and to achieve a high energy efficiency and low packet delivery latency. Based on PDC, an Adaptive Data Collection (ADC) protocol is further proposed to achieve dynamic duty-cycling and free addressing, which can improve network heterogeneity, load adaptivity, and energy efficiency. Both PDC and ADC have been implemented in a pioneer open-source operating system for the Internet of Things, and evaluated through a testbed built based on two hardware platforms, as well as through emulations. Second, Linear Sensor Network (LSN) has attracted increasing attention due to the vast requirements on the monitoring and surveillance of a structure or area with a linear topology. Being aware that, for LSN, there is few work on the network modeling and analysis based on a duty-cycled MAC protocol, this dissertation proposes a framework for modeling and analyzing a class of duty-cycled, multi-hop data collection protocols for LSNs. With the model, the dissertation thoroughly investigates the PDC performance in an LSN, considering both saturated and unsaturated scenarios, with and without retransmission. Extensive OPNET simulations have been carried out to validate the accuracy of the model. Third, in the design and modeling of PDC above, the transmission and interference ranges are defined for successful communications between a pair of nodes. It does not consider the cumulative interference from the transmitters which are out of the contention range of a receiver. Since most performance metrics in wireless networks, such as outage probability, link capacity, etc., are nonlinear functions of the distances among communicating, relaying, and interfering nodes, a physical interference model based on distance is definitely needed in quantifying these metrics. Such quantifications eventually involve the Nodal Distance Distribution (NDD) intrinsically depending on network coverage and nodal spatial distribution. By extending a tool in integral geometry and using decomposition and recursion, this dissertation proposes a systematic and algorithmic approach to obtaining the NDD between two nodes which are uniformly distributed at random in an arbitrarily-shaped network. Fourth, with the proposed approach to NDDs, the dissertation presents a physical interference model framework to analyze the cumulative interference and link outage probability for an LSN running the PDC protocol. The framework is further applied to analyze 2D networks, i.e., ad hoc Device-to-Device (D2D) communications underlaying cellular networks, where the cumulative interference and link outage probabilities for both cellular and D2D communications are thoroughly investigated. / Graduate / 0984 / 0544 / tong1987fei@163.com

This thesis presents methods for the wafer-level integration of shape memory alloy (SMA) and electrostatic actuators to functionalize MEMS devices. The integration methods are based on heterogeneous integration, which is the integration of different materials and technologies. Background information about the actuators and the integration method is provided. SMA microactuators offer the highest work density of all MEMS actuators, however, they are not yet a standard MEMS material, partially due to the lack of proper wafer-level integration methods. This thesis presents methods for the wafer-level heterogeneous integration of bulk SMA sheets and wires with silicon microstructures. First concepts and experiments are presented for integrating SMA actuators with knife gate microvalves, which are introduced in this thesis. These microvalves feature a gate moving out-of-plane to regulate a gas flow and first measurements indicate outstanding pneumatic performance in relation to the consumed silicon footprint area. This part of the work also includes a novel technique for the footprint and thickness independent selective release of Au-Si eutectically bonded microstructures based on localized electrochemical etching. Electrostatic actuators are presented to functionalize MEMS crossbar switches, which are intended for the automated reconfiguration of copper-wire telecommunication networks and must allow to interconnect a number of input lines to a number of output lines in any combination desired. Following the concepts of heterogeneous integration, the device is divided into two parts which are fabricated separately and then assembled. One part contains an array of double-pole single-throw S-shaped actuator MEMS switches. The other part contains a signal line routing network which is interconnected by the switches after assembly of the two parts. The assembly is based on patterned adhesive wafer bonding and results in wafer-level encapsulation of the switch array. During operation, the switches in these arrays must be individually addressable. Instead of controlling each element with individual control lines, this thesis investigates a row/column addressing scheme to individually pull in or pull out single electrostatic actuators in the array with maximum operational reliability, determined by the statistical parameters of the pull-in and pull-out characteristics of the actuators. / QC20100729

The quantum properties of matter waves, in particular quantum correlations and entanglement are an important frontier in atom optics with applications in quantum metrology and quantum information. In this thesis, we report the first observation of sub-Poissonian fluctuations in the magnetization of a spinor 87Rb condensate. The fluctuations in the magnetization are reduced up to 10 dB below the classical shot noise limit. This relative number squeezing is indicative of the predicted pair-correlations in a spinor condensate and lay the foundation for future experiments involving spin-squeezing and entanglement measurements. We have investigated the limits of the imaging techniques used in our lab, absorption and fluorescence imaging, and have developed the capability to measure atoms numbers with an uncertainly < 10 atoms. Condensates as small as ≈ 10 atoms were imaged and the measured fluctuations agree well with the theoretical predictions. Furthermore, we implement a reliable calibration method of our imaging system based on quantum projection noise measurements. We have resolved the individual lattice sites of a standing-wave potential created by a CO2 laser, which has a lattice spacing of 5.3 µm. Using microwaves, we site-selectively address and manipulate the condensate and therefore demonstrate the ability to perturb the lattice condensate of a local level. Interference between condensates in adjacent lattice sites and lattice sites separated by a lattice site are observed.

This has paper has two main purposes: to analyze the translation of specialized terminology and ways of addressing the reader in a specialized tourist text in Spanish and its Swedish target text. The terminological difficulties on volcanism in the translation concerns the fact that the semantic field on this topic is diversified in the Canary Islands, contrary to the semantic field on volcanoes in Swedish. The theoretical background in this paper gives keys to describing the meaning of words in terms of connotation and denotation and describes how to use semantic components to solve the difficulties of terminology. The theory applied to the difficulties concerning ways of addressing the reader in the source text, explains the relation between the sender and the reader in terms of distance and closenes. The paper shows that the source text is inconsistent in this matter. To solve this task the translator has adopted a homogeneous way of addressing the reader, to achieve a target text loyal to the Swedish speaking reader and to consistency. The translation of tourist texts has been thought of as being an easy task, not demanding too much of its translators. This paper aims at showing that this is not the case.

This dissertation is the culmination of extensive literature study on the application of Restorative Justice in the South African Correctional System. International and national resources on the application of Restorative Justice both in Corrections and as pre-sentence option had been studied. The background of the penal system and the development of Restorative Justice as part of the Criminal Justice System are investigated by looking at ancient practices, indigenous and modern practices. The study intends to draw on experience from other countries, while at the same time advocate for the development of a uniquely South African model or practice. The role of the most important stakeholders, namely victim, offender and community is emphasized with reference to the challenges that offenders face in terms of reintegration and the lack of resources in communities to enable them to honour Restorative Justice agreements. / Criminology and Security Science / M. A. (Criminology)

Drug abuse is becoming an increasing problem in Kenya. A number of studies carried out in the country show that almost every Kenyan youngster at one time or another experiments with drugs, especially beer and cigarettes. The major cause of concern is that a significant proportion of these young people eventually get addicted posing a threat to their own health and safety, while creating difficulties for their families and the public at large into difficulties. This study sought to establish the current trend of drug abuse among students in Kenyan secondary schools, and to analyze the strategies used to address the problem. The ultimate aim was to propose a programme for prevention and intervention. The study is a descriptive survey. In view of this, the field survey method was adopted to collect quantitative and qualitative data, using questionnaires and interviews. Both qualitative and quantitative approaches were used in data analysis, thus there was a mixed model research design approach to data analysis. The analysis of structured items was mainly done using the Statistical Package for Social Sciences (SPSS). The key findings from the study were that drug abuse among students is common; both boys and girls have abused drugs with the majority being in boys‟ schools; the greatest ratio of drug abusers to non-abusers among the sampled schools are aged between 20 and 22 years; there is a significant relationship between drug abuse and age, use of drugs by other family members and easy access to drugs. A variety of factors contribute to drug abuse with the majority of students citing curiosity, acceptance by peers and ignorance as to the dangers of drug abuse as the main reasons. Both the school administrators and teachers face a number of challenges in an attempting to curb drug abuse in schools. The study makes a number of recommendations for policy and further research. A number of guidelines are proposed for developing a programme for prevention and intervention. / Educational Studies / D. Ed. (Socio-Education)