DSpace Collection: Thesis and Dissertations by UNITEN StudentThesis and Dissertations by UNITEN Studenthttp://dspace.uniten.edu.my/jspui/handle/123456789/242024-03-25T14:01:47Z2024-03-25T14:01:47ZSIMULATION AND CHARACTERIZATION OF SEPARATE ABSORPTION AND MULTIPLICATION InGaAs/InP AVALANCHE PHOTODIODEMAHDI ALL KHAMIShttp://dspace.uniten.edu.my/jspui/handle/123456789/158082020-10-07T03:22:16Z2019-07-01T00:00:00ZTitle: SIMULATION AND CHARACTERIZATION OF SEPARATE ABSORPTION AND MULTIPLICATION InGaAs/InP AVALANCHE PHOTODIODE
Authors: MAHDI ALL KHAMIS
Abstract: Avalanche photodiodes (APDs) are important components in the receiver module of the telecommunication system. Utilizing Indium Gallium Arsenide (InGaAs) as an absorption layer and Indium Phosphide (InP) as a multiplication layer makes the device suitable for optical fiber communication application especially in long haul communication system. The APD has gone through several evolutions in the last few decades. Each evolution has been with the purpose of increasing avalanche gain, frequency response and yield. This thesis reports a comprehensive work in designing the structure and evaluating the performance of the separate absorption, graded, charged and multiplication InGaAs/InP (SAGCM InGaAs/InP) through simulation of the APD device structure. The effect of multiplication layer width (MLW) and absorption layer width (ALW) on APD performance was studied and investigated. Silvaco TCAD software was used as simulation tools to simulate a precise model of InGaAs/InP APD and analyze its performance under illuminated conditions. As such, three different ALW with various MLW have been simulated while the structure of APD and material parameters were kept constant. It was found that in the APD with smaller MLW, the distance between the punch-through voltage and the breakdown voltage can be maximized. Therefore, the operation region of APD will be extended. In addition, the multiplication gain was calculated from the photocurrent and primary current by taking the APD collection efficiency effect under the consideration. One of the main challenges in this work was the precise physical parameters of the semiconductor materials for the simulation of dark current, photocurrent and impact ionization of the APD. Representing APD gain by considering the collection efficiency effect of APD was another major challenge. As such, extensive investigation has been performed and as a results a list of semiconductor material physical parameters which is suitable for (SAGCM) InGaAs/InP APD design using Silvaco ATLAS framework was fully established by correlating the simulation results to the experimental results. These physical parameters would be useful for future research work in optimizing the InGaAs/InP APD before going into actual semiconductor growth and APDs fabrication, which would significantly reduce the design cost of the APDs.2019-07-01T00:00:00ZEFFECT OF THORIUM FUEL ADDITION IN THE CONFIGURATION OF PUSPATI TRIGA REACTORABDUL HANNAN BIN DAMAHURIhttp://dspace.uniten.edu.my/jspui/handle/123456789/158062020-10-07T03:18:15Z2020-03-01T00:00:00ZTitle: EFFECT OF THORIUM FUEL ADDITION IN THE CONFIGURATION OF PUSPATI TRIGA REACTOR
Authors: ABDUL HANNAN BIN DAMAHURI
Abstract: A neutronic configuration analysis of thorium fuel has been conducted to PUSPATI TRIGA Reactor (RTP) that are using uranium zirconium hydride (U-ZrH1.6) as fuel. Sixty nine core configurations have been simulated in this project, with each core has different investigated parameters. The project use the design of core RTP, which is core #1 as the reference. It has a similar dimension, criticality (484 PCM difference), and flux distribution with the original core of RTP. There are three main core variations, namely core-01, core-02, and core-03 that are modelled and simulated. Core-01 has additional numbers of thorium fuel rods. Core-02 has extra rods of thorium fuel in ring F with subtraction of uranium fuel rods in the core. Lastly, core-03 has an arrangement of thorium fuel rods in a seed-blanket unit. All three main configurations have ten variations with each of them has different numbers of fuel rods. These variations are labelled from ‘A’ until ‘J’. This work also investigates other configurations such as the checker box design, ring by ring design, and diamond shape design. Other important variables are also studied, such as power, mass, and types of thorium fuels. All these configurations are simulated using MCNPX to determine its criticality, flux distribution, burnup rate, and uranium-233 buildup. Results show that core-Ct has the highest production of uranium-233 with 334.9 gram, and core-Bt has the longest lifecycle, which is 399 days. Thermal fluxes recorded from all simulated configurations are almost similar to the actual RTP core’s flux, ranging from 4.28 1012 to 1.36 1013 n/cm2s. Overall, the seed-blanket configuration offers the most favourable characteristics, especially criticality, that can be beneficial for PUSPATI TRIGA Reactor (RTP).2020-03-01T00:00:00ZKNOWLEDGE SHARING BEHAVIOUR AMONG NURSING SUPERVISORS IN ONLINE HEALTHCARE COMMUNITIES IN JORDANSALAH JAMIL ABED AL FATTAH SHEHABhttp://dspace.uniten.edu.my/jspui/handle/123456789/158052020-10-07T03:15:35Z2020-03-16T00:00:00ZTitle: KNOWLEDGE SHARING BEHAVIOUR AMONG NURSING SUPERVISORS IN ONLINE HEALTHCARE COMMUNITIES IN JORDAN
Authors: SALAH JAMIL ABED AL FATTAH SHEHAB
Abstract: The main objectives of this study are, firstly, to identify the individual factors affecting knowledge sharing behaviour among nursing supervisors in online healthcare communites and secondly, to assess the moderating effect of knowledge self-efficacy on the relationship between individual factors and knowledge sharing behaviour among nursing supervisors in online healthcare communities in Jordan. This study was mainly underpinned by the Social Exchange Theory and Social Cognitive Theory. In order to achieve the study’s objectives, a quantitative study method was mainly used, where a total of 337 questionnaires were distributed to the nursing supervisors in private hospitals in Jordan, in the form of self-administrated surveys. A total of 295 questionnaires were returned, of which, 283 questionnaires completed by participants were usable, indicating a response rate of 84% percent. Structural Equation Modelling was applied using Smart PLS for data analysis. The results show that all independent variables including trust, reciprocity, reputation and ability to share on knowledge sharing behaviour explains 62.7% of knowledge sharing behavior of nursing supervisors in online healthcare communities. Secondly, knowledge self-efficacy acts as moderator between trust, reciprocity and reputation and knowledge sharing behavior. However, knowledge self-efficacy does not moderate the relationship between knowledge self-efficacy and knowledge sharing behaviour. This study contributes to the body of knowledge by conceptualizing a research model, which reflects the moderating role of knowledge self-efficacy on the relationship between trust, reciprocity and reputation and knowledge sharing behavior among nursing supervisors in online healthcare communities. Moreover, this study provides guidelines for nursing supervisors in order to improve knowledge sharing behaviour in online healthcare communities in private hospitals in Jordan. The findings of this study offer a basis for further research of knowledge sharing in the context of healthcare sector.2020-03-16T00:00:00ZCLOUD COMPUTING ADOPTION MODEL IN HIGHER EDUCATION INSTITUTIONSABDULNOOR SALEHhttp://dspace.uniten.edu.my/jspui/handle/123456789/158042020-10-07T03:12:24Z2019-12-01T00:00:00ZTitle: CLOUD COMPUTING ADOPTION MODEL IN HIGHER EDUCATION INSTITUTIONS
Authors: ABDULNOOR SALEH
Abstract: Cloud computing is seen as one of many new innovation solutions in assisting higher education institutions (HEIs) in improving their learning outcome delivery processes and efficiency, especially in terms of minimizing financial investments while becoming readily accessible to wider pools of potential students. While it has been widely adopted in HEIs, its adoption in developing countries is very low and there is a lack of empirical studies that examine the factors that influence its adoption in HEIs. This research proposes a conceptual model that identifies the factors that influence the adoption of cloud computing in HEIs in a developing country by integrating technological, organizational, environmental and human factors. Hypotheses were developed using four theories: (a) Technology, Organization and Environment Framework, (b) Diffusion of Innovations Theory, (c) Technology Acceptance Model and (d) Theory of Reasoned Action. A survey questionnaire was administered to 288 individuals comprising IT managers, IT staff and IT lecturers in HEIs in Yemen. Data were analysed using Statistical Package for the Social Sciences (SPSS) and Structural Equation Modelling (SEM) technique. The results indicate that Relative Advantage, Compatibility, Complexity, Data Concern, Top Management Support and Technology Readiness had significant effects on Perceived Usefulness towards the Intention to adopt cloud computing in HEIs. Perceived Ease of Use was found to have been significantly affected by Complexity, Data Concern, Technology Readiness, and IT Skills. In addition, the results also show that Subjective Norms positively moderates the relationship between Perceived Usefulness and Attitude towards the Intention to adopt cloud computing in HEIs. This research shows that for HEIs in Yemen to successfully adopt cloud computing, the top management has to play significant roles in ensuring that the technologies to support this initiative has to be in place and are compatible with other existing technologies adopted in HEIs.2019-12-01T00:00:00Z