Thesis (M.Dev.) --University of Limpopo, 2013 / Agricultural cooperatives have been widely promoted as a vehicle for smallholder agricultural development in South Africa. As a result, agricultural co-operative registrations in South Africa are increasing. However, research suggests that South African co-operatives have generally not been effective, successful and functional. This study has investigated the challenges facing agricultural cooperatives in the Greater Tzaneen Municipality. It is expected that identification of these elements may enable institutions that offer support to cooperatives make better decisions to improve primary agricultural cooperatives support. Understanding of these elements could inform the efforts for members of cooperatives to achieve their set objectives and thus improve agriculture cooperative, employability, functionality and profitability. A case study of the Nkomamonta Agricultural Primary Cooperative in the Greater Tzaneen Municipalities is used. It is composed of fifteen agricultural cooperative which were purposively selected for the study because they were nearby, they are a pilot agricultural cooperative in the municipality and which are also not functioning as expected. The sample also included the purposively selected members, customers of these agricultural cooperative, workers, Greater Tzaneen Municipality, Local SEDA and LIBSA to explore the differences and provide insight to the knowledge, opinions and challenges that are facing agricultural cooperatives. One-on-one interviews were carried out with co-operative members as well as focus group discussions with customers, members of the cooperatives, workers, the Municipal officials, SEDA and LIBSA. A framework for analysing the challenges agricultural cooperatives with reference to the Nkomamonta cooperative case study was developed using literature of objectives of agricultural cooperatives, challenges which were identified by other researchers and success factors of smallholder agriculture. According to this study, farmers’ activities are hampered by a number of constraints. Production capability of the fifteen primary cooperatives is hampered by resource constraints such as lack of access to land (in one cooperative), machinery and equipment, finances and information relevant to production. Marketing, transportation, poor infrastructure and the elderly age of some cooperative members and issues related to free-rider syndrome were part of the problems that were identified. Low capability of some of the fifteen cooperatives to mobilise resources, use the limited resources available and low capability to manage institutional arrangements rendered the cooperatives ineffective in achieving their set objectives. The study recommends strategies for ensuring that the challenges facing agricultural cooperatives are minimised to better their services in the community. These include strategies for addressing internal and external issues affecting the cooperatives. Direct intervention from government is recommended to improve production through revising land allocation systems which made Kulani Agricultural Cooperative not to have land for growing crops. Jerry Jeff and Nwa Rex went out of action for eight months due to renovation of neighbourhood inorganic farms by the Department of Agriculture. Another strategy would entail improving extension services and follow up and strict monitoring of effective use of government resources provided to farmers. Responding and action taking when disaster has struck the agricultural cooperative by Government is also a plausible strategy. Access and training to relevant technologies to improve the processing and packaging capabilities of cooperatives should improve. Marketing and management activities should be supported through provision of improved infrastructure and relevant training. Farmers themselves should consider assisting one another especially regarding land issues as it was discovered that 67 hectares lay unutilised while the farmer next door needed land. Farmers should also engage in value added activities, and improve marketing programs and cost-effective distribution mechanisms.

Parent education has existed for as long as one parent has attempted to help another, and for as long as we have record s . To what extent it has served its purpose has not been fully established . Only the future will fully tell how successful parent education programs have been among those who participated in them, because the final measure of success of a parent education program is the degree to which it contributes to effective family relationships and to favorable growth and development of children in the home .

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Master of Philosophy / Wireless technology is experiencing spectacular developments, due to the emergence of interactive and digital multimedia applications as well as rapid advances in the highly integrated systems. For the next-generation mobile communication systems, one can expect wireless connectivity between any devices at any time and anywhere with a range of multimedia contents. A key requirement in such systems is the availability of high-speed and robust communication links. Unfortunately, communications over wireless channels inherently suffer from a number of fundamental physical limitations, such as multipath fading, scarce radio spectrum, and limited battery power supply for mobile devices. Cooperative diversity (CD) technology is a promising solution for future wireless communication systems to achieve broader coverage and to mitigate wireless channels’ impairments without the need to use high power at the transmitter. In general, cooperative relaying systems have a source node multicasting a message to a number of cooperative relays, which in turn resend a processed version message to an intended destination node. The destination node combines the signal received from the relays, and takes into account the source’s original signal to decode the message. The CD communication systems exploit two fundamental features of the wireless medium: its broadcast nature and its ability to achieve diversity through independent channels. A variety of relaying protocols have been considered and utilized in cooperative wireless networks. Amplify and forward (AAF) and decode and forward (DAF) are two popular protocols, frequently used in the cooperative systems. In the AAF mode, the relay amplifies the received signal prior to retransmission. In the DAF mode, the relay fully decodes the received signal, re-encodes and forwards it to the destination. Due to the retransmission without decoding, AAF has the shortcoming that noise accumulated in the received signal is amplified at the transmission. DAF suffers from decoding errors that can lead to severe error propagation. To further enhance the quality of service (QoS) of CD communication systems, hybrid Automatic Repeat-reQuest (HARQ) protocols have been proposed. Thus, if the destination requires an ARQ retransmission, it could come from one of relays rather than the source node. This thesis proposes an improved HARQ scheme with an adaptive relaying protocol (ARP). Focusing on the HARQ as a central theme, we start by introducing the concept of ARP. Then we use it as the basis for designing three types of HARQ schemes, denoted by HARQ I-ARP, HARQ II-ARP and HARQ III-ARP. We describe the relaying protocols, (both AAF and DAF), and their operations, including channel access between the source and relay, the feedback scheme, and the combining methods at the receivers. To investigate the benefits of the proposed HARQ scheme, we analyze its frame error rate (FER) and throughput performance over a quasi-static fading channel. We can compare these with the reference methods, HARQ with AAF (HARQ-AAF) and HARQ with perfect distributed turbo codes (DTC), for which correct decoding is always assumed at the relay (HARQ-perfect DTC). It is shown that the proposed HARQ-ARP scheme can always performs better than the HARQ-AAF scheme. As the signal-to-noise ratio (SNR) of the channel between the source and relay increases, the performance of the proposed HARQ-ARP scheme approaches that of the HARQ-perfect DTC scheme.

Master of Philosophy / Wireless technology is experiencing spectacular developments, due to the emergence of interactive and digital multimedia applications as well as rapid advances in the highly integrated systems. For the next-generation mobile communication systems, one can expect wireless connectivity between any devices at any time and anywhere with a range of multimedia contents. A key requirement in such systems is the availability of high-speed and robust communication links. Unfortunately, communications over wireless channels inherently suffer from a number of fundamental physical limitations, such as multipath fading, scarce radio spectrum, and limited battery power supply for mobile devices. Cooperative diversity (CD) technology is a promising solution for future wireless communication systems to achieve broader coverage and to mitigate wireless channels’ impairments without the need to use high power at the transmitter. In general, cooperative relaying systems have a source node multicasting a message to a number of cooperative relays, which in turn resend a processed version message to an intended destination node. The destination node combines the signal received from the relays, and takes into account the source’s original signal to decode the message. The CD communication systems exploit two fundamental features of the wireless medium: its broadcast nature and its ability to achieve diversity through independent channels. A variety of relaying protocols have been considered and utilized in cooperative wireless networks. Amplify and forward (AAF) and decode and forward (DAF) are two popular protocols, frequently used in the cooperative systems. In the AAF mode, the relay amplifies the received signal prior to retransmission. In the DAF mode, the relay fully decodes the received signal, re-encodes and forwards it to the destination. Due to the retransmission without decoding, AAF has the shortcoming that noise accumulated in the received signal is amplified at the transmission. DAF suffers from decoding errors that can lead to severe error propagation. To further enhance the quality of service (QoS) of CD communication systems, hybrid Automatic Repeat-reQuest (HARQ) protocols have been proposed. Thus, if the destination requires an ARQ retransmission, it could come from one of relays rather than the source node. This thesis proposes an improved HARQ scheme with an adaptive relaying protocol (ARP). Focusing on the HARQ as a central theme, we start by introducing the concept of ARP. Then we use it as the basis for designing three types of HARQ schemes, denoted by HARQ I-ARP, HARQ II-ARP and HARQ III-ARP. We describe the relaying protocols, (both AAF and DAF), and their operations, including channel access between the source and relay, the feedback scheme, and the combining methods at the receivers. To investigate the benefits of the proposed HARQ scheme, we analyze its frame error rate (FER) and throughput performance over a quasi-static fading channel. We can compare these with the reference methods, HARQ with AAF (HARQ-AAF) and HARQ with perfect distributed turbo codes (DTC), for which correct decoding is always assumed at the relay (HARQ-perfect DTC). It is shown that the proposed HARQ-ARP scheme can always performs better than the HARQ-AAF scheme. As the signal-to-noise ratio (SNR) of the channel between the source and relay increases, the performance of the proposed HARQ-ARP scheme approaches that of the HARQ-perfect DTC scheme.

There are four contributions of this research: 1) confirmation of inconsistent use of terminology in the Computer Supported Cooperative Work (CSCW) research field; 2) the development of a hierarchical terminology technique that extends the idea of cognitive mapping into a hierarchy of concepts and dictionary of related definitions; 3) a taxonomy of terminology showing the boundary of the CSCW research field; and 4) a dictionary of definitions relating to the terminology in the taxonomy. The investigation of prior research in this field found that there was a proliferation of terms all relating to support of groups, and there was a proliferation of software and systems that support groups. However, the terminology and definitions used by researchers were found to be inconsistent, with some terms being defined differently, but then used interchangeably. Inconsistency makes it difficult to determine what technology is being used in the research and where a research study fits into the research field. Knowledge of any research field is mainly gained through reading published research documents. This research analysed published documents in Computer Supported Cooperative Work (CSCW) to determine the scope, structure and meaning of the terminology used in this research field. The research resulted in a hierarchy of terminology and a dictionary of definitions. Future research will determine the value of these structures for new researchers, experienced researchers, and practitioners. During the investigation of prior research no technique was identified to undertake such a study. A hierarchical terminology technique (HTT), which is a form of content analysis process, was developed to structure a hierarchy of concepts to expose the relationships between terms. This technique includes terminology identification, analysis and presentation to show the scope of a research field and to present terminology and definitions to improve consistency. This technique can be used in other fields of study.

Bibliography: leaves [392]-427. Study of the Italian co-operative enterprises associated with La Lega Nazionale delle Cooperative e Mutue, with particular reference to those in the region of Emilia Romagna. Examines how these cooperatives have managed to flourish despite the poor survival record in other countries with a market economy.

The design of the control laws governing the behavior of individual agents is crucial for the successful development of cooperative agent teams. These control laws may utilize a combination of local and/or global knowledge to achieve the resulting group behavior. A key difficulty in this development is deciding the proper balance between local and global control required to achieve the desired emergent group behavior. This paper addresses this issue by presenting some general guidelines and principles for determining the appropriate level of global versus local control. These principles are illustrated and implemented in a "keep formation'' cooperative task case study.

This is a comparative study between traditional group work and cooperative learning among 9 graders at a Swedish high school. The classes did an assignment that involved translating and then both students and teachers answered a questionnaire. An example of how profitable cooperative learning is is the fact that the speech activity was more equal in the cooperative groups. All the students in the cooperative groups had to contribute to the assignment in order to fulfill the assignment. The reason for higher speech activity is the structure of cooperative learning, which involves roles suited for the assignment. The study contains observations of four classes, student reflections and teacher reflections from a compulsory school in the middle of Sweden. The results of these observations support each other and they point to the same direction, cooperative learning seems to be a successful didactic approach in the socio cultural perspective. Since the students learn important socio cultural rules, which is useful in society. The students working in cooperative learning show that students cooperate more and enjoy their work when they have their defined roles in the group.