Grid computing enables computers on different networks to share their resources in an organized way. Authorized users can deploy the resources as if they were in the same organization. This resource sharing environment is called a Virtual Organization (VOs). To enable an open Grid to support resource sharing between multiple heterogeneous VOs, an authorization policy management framework is required to support authorization for VOs using heterogeneous authorization systems. The challenges include dynamic Grid memberships, VO trust relationships, and heterogeneous authorization systems. / To solve these problems in a loose-coupling way, we propose a dynamic, distributive and heterogeneous authorization policy management framework. The framework is called Dynamic Policy Management Framework (DPMF). DPMF groups VOs of the same authorization systems to form a virtual cluster. Authorization policy management is divided into inter-cluster heterogeneous policy management, and intra-cluster homogeneous policy management. Inside a virtual cluster, the workloads of policy management can be distributed among the VOs according to their trust relationships. The Conflict Analysis with Partial Information (CAPI) mechanism is developed to make authorization decisions in open environments without complete policy information. A Heterogeneous Policy Management mechanism is developed for DPMF to support inter-cluster heterogeneous policy management. / Traditional authorization policy management frameworks work well in authorization for a single VO where the participating hosts agree to follow a global authorization system. However, they are not capable of authorization policy management for multiple VOs which deploys heterogeneous authorization systems. / Yu, Chiu Man. / "April 2007." / Adviser: Ng Kam Wing. / Source: Dissertation Abstracts International, Volume: 69-01, Section: B, page: 0447. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2007. / Includes bibliographical references (p. 200-206). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstracts in English and Chinese. / School code: 1307.

Le maintien de personnes âgées au domicile le plus longtemps possible est censé apporter une réponse à la croissance de l’espérance de vie en occident et a des coûts toujours croissants pour la société. ce travail de thèse a été réalisé dans le cadre du projet CompanionAble, qui vise a fournir une solution intégrée maison intelligente - robot aux personnes âgées, vivant seules. L'objectif est de maintenir un confort en fin de vie à un niveau élevé et à traiter les situations dangereuses pour elles, comme les chutes, avant que les conséquences ne deviennent trop importantes. Les éléments qui m’intéressent dans ce cadre sont le robot et l’opérateur, qui se trouve à l’extérieur de la maison, et qui peut téléopérer le robot en vue d’interagir avec la personne âgée, soit pour des activités ludiques (visioconférence, exercices de stimulation cognitive), soit pour des situations d’urgence (chute, perte de connaissance… de la personne âgée). Pour maintenir les coûts du système à un niveau raisonnable, on a envisagé l’utilisation de l’internet public pour la connexion entre le site maître (où se trouve l‘opérateur) et le site esclave (où se trouve le robot). Une autre spécificité du notre système est le fait que les utilisateurs ne sont pas des spécialistes de la téléopération. J’ai donc cherché à faciliter la tâche de pilotage du robot, dans ce contexte spécifique. Du côté de l’interface, on a cherché à aider l’opérateur traitant les problèmes liés aux délais de transmission (possibles à cause de l’utilisation de l’internet) et lui donner la possibilité d’utiliser une interface écologique, qui utilise des éléments de réalité augmentée. Du côté du robot, on a rajouté un nouveau mode de commande, semi-autonome, pour que l’opérateur soit plus à l’aise pendant qu’il le déplace. Pour finir, on a examiné la possibilité de passer d’un mode de commande à un autre, pour que l’opérateur soit le moins affecté que possible par des perturbations et que les performances du système restent acceptables. Les solutions proposées ont été implantée sur un système réel et évaluées au laboratoire et en situations réelles dans le cadre du projet européen CompanionAble. / Enabling older people to live in their homes as long as possible is supposed to respond to the growth of life expectancy in the west and the increasing costs to society. The present thesis was conducted in the framework of the companionable, which aims to provide an integrated smart home - robot for the elderly, which are living alone. The objective is to maintain the end of life comfort at a high level and to deal with dangerous situations for them, such as falls, before the consequences become too costly. The elements that interest me in this context are the robot and the remote operator, which is outside the home, and can teleoperate the robot to interact with the elderly, for recreational activities ( videoconferencing, cognitive stimulation exercises) or for emergency situations (falls, loss of consciousness, etc.). To keep the system costs to a reasonable level, we considered using the public internet as the connection between the master site (where the operator is) and the slave site (where the robot is). another unique feature of our system is that users are not specialists in teleoperation. As such, i tried to ease the task of controlling the robot, in this specific context. On the remote control interface side, we tried to help the operator in dealing with the problems associated with transmission delays (due to the possible use of the internet) and we gave him/her the option of using an ecological interface, which uses elements of augmented reality. On the robot side, we added a new command mode, semi-autonomous, so that the operator is more at ease as he/she controls the robot. finally, we examined the possibility of switching from one control mode to another, so that the operator is the least affected by possible disturbances and system performance is kept acceptable. The proposed solutions have been implemented on a real system and evaluated in the laboratory and in real situations, in the framework of the european CompanionAble project.

Shared decision making (SDM) is rarely used in pediatric clinical practice. The purpose of this dissertation was to explore factors influencing SDM implementation in pediatric clinical practice. We conducted three studies that were guided by the Ottawa Model of Research Use (OMRU): Study 1 was a systematic review using Cochrane methods and the Mixed Methods Appraisal Tool to determine pediatric SDM barriers and facilitators from multiple perspectives. Eighty studies, of low to high quality, were included. At each OMRU level, frequently cited barriers were: option features (decision), poor quality information (innovation), emotional state (adopter), power relations (relational), and insufficient time (environment). Frequently cited facilitators were: lower stake decisions (decision), agreement with SDM (adopter), high quality information (innovation), trust and respect (relational), and SDM tools/resources (environment). Across participant types, frequently cited barriers were: insufficient time (healthcare providers (HCP)), option features (parents), power imbalances (children), and HCPs’ SDM skills (observers). Frequently cited facilitators were: good quality information (HCPs) and agreement with SDM (parents/children). Study 2 was a post-test design that evaluated SDM knowledge and acceptability of learners who completed the Ottawa Decision Support Tutorial (ODST). Most learners were HCPs (62%). Overall, ODST learners had a median knowledge test score of 8/10 (IQR = 7-9; n=6604) and 90% reported good or excellent impressions (n=4276) after completing the tutorial. Few learners suggested improvements. Study 3 used mixed methods to evaluate pediatric HCPs’ perceived SDM barriers and facilitators after training (ODST plus workshop). Participants completed a SDM barrier survey (n=60; 88% response rate) and semi-structured interview (n=11). Their intention to use SDM was high (mean score = 5.6/7, SD=0.8). However, 90% of respondents reported minimal SDM use after training. Main barriers were lack of buy-in (adopter level) and time constraints (environmental level). Healthcare providers wanted a team-based approach to SDM training (training level). Adopters face numerous and diverse barriers to SDM use, before and after SDM training. Pediatric HCPs who completed the ODST were knowledgeable about SDM. Despite positive intentions, training alone was insufficient to achieve routine SDM use. These findings can inform intervention development to promote SDM implementation in pediatric clinical practice.

Modern superscalar processors exploit instruction-level parallelism (ILP) by issuing multiple instructions in a single cycle because of increasing demand for higher performance in computing. However, stalls due to cache misses severely degrade the performance by disturbing the exploitation of ILP. Multiprocessors also greatly exacerbate the memory latency problem. In SMPs, contention due to the shared bus located between the processors's L2 cache and the shared memory adds additional delay to the memory latency. In distributed shared memory (DSM) systems, the memory latency problem becomes even more severe because a miss on the local memory requires access to remote memory. This limits the performance because the processor can not spend its time on useful work until the reply from the remote memory is received. There are a number of techniques that effectively reduce the memory latency. Multithreadings has emerged as one of the most promising and exciting techniques to tolerate memory latency. This thesis aims to realize a simulator that supports software-controlled multithreadings environment on a Distributed Shared Memory and to show preliminary simulation results. / Graduation date: 2000

Background: The process of shared decision making (SDM), a key component of interprofessional (IP) practice, provides an opportunity for the separate and shared knowledge and skills of care providers to synergistically influence the client / patient care provided. The aim of this study was to understand how different professional groups perceive IPSDM, their role as effective participants in the process and how they ensure their voices are heard. Methods: A sequential explanatory mixed methods design was used consisting of a realist review of the literature about IPSDM in intensive care, a survey of the IP team (n=96; RR-81.4%) about collaboration and satisfaction with the decision making process in NICU, semi-structured interviews with a sample of team members (n=22) working in NICU, and observation of team decision making interactions during morning rounds over a two week period. A tertiary care NICU in Canada was the study setting. Findings: The study revealed a number of key findings that are important to our increased understanding of IPSDM. Healthcare professionals’ (HCP) views differ about what constitutes IPSDM. The nature of the decision (triage, chronic condition, values sensitive) is an important influencing factor for IPSDM. Four key roles were identified as essential to the IPSDM process: professional expert, leader, synthesizer and parent. IPSDM involves collaboration, sharing, weighing and building consensus to overcome diversity. HCPs use persuasive knowledge exchange strategies to ensure their voices are heard during IPSDM. Buffering power differentials and increasing agreement about best options lead to well-informed decisions. A model was developed to illustrate the relationships among these concepts. Conclusions: Findings from this study improve understanding of how different members of the team participate in the IPSDM process, and highlight effective strategies to ensure professional voices are heard, understood and considered during deliberations.

This study investigated the effects of a shared book reading professional development program on preschool educators’ ability to engage children in book-related conversations and promote word learning. 20 preschool educators were video-recorded reading two books to a small group of children at pre- and posttest eight weeks apart. Educators in the experimental group (n = 10) participated in professional development that included classroom instruction and individualized coaching. The control group remained on the waitlist. All video-recordings were transcribed and coded. Results indicated that educators in the experimental group included significantly more questions, responsive statements, and lexical diversity in their book-related talk compared to the control group. Further, they facilitated longer book-related conversations and had more long conversations (i.e., five turns or longer). Finally, conversations that included inferential talk resulted in the longest conversations. These findings suggest that professional development can enhance educators’ responsiveness during shared book reading.

This study investigated the effects of a shared book reading professional development program on preschool educators’ ability to engage children in book-related conversations and promote word learning. 20 preschool educators were video-recorded reading two books to a small group of children at pre- and posttest eight weeks apart. Educators in the experimental group (n = 10) participated in professional development that included classroom instruction and individualized coaching. The control group remained on the waitlist. All video-recordings were transcribed and coded. Results indicated that educators in the experimental group included significantly more questions, responsive statements, and lexical diversity in their book-related talk compared to the control group. Further, they facilitated longer book-related conversations and had more long conversations (i.e., five turns or longer). Finally, conversations that included inferential talk resulted in the longest conversations. These findings suggest that professional development can enhance educators’ responsiveness during shared book reading.

Background: The process of shared decision making (SDM), a key component of interprofessional (IP) practice, provides an opportunity for the separate and shared knowledge and skills of care providers to synergistically influence the client / patient care provided. The aim of this study was to understand how different professional groups perceive IPSDM, their role as effective participants in the process and how they ensure their voices are heard. Methods: A sequential explanatory mixed methods design was used consisting of a realist review of the literature about IPSDM in intensive care, a survey of the IP team (n=96; RR-81.4%) about collaboration and satisfaction with the decision making process in NICU, semi-structured interviews with a sample of team members (n=22) working in NICU, and observation of team decision making interactions during morning rounds over a two week period. A tertiary care NICU in Canada was the study setting. Findings: The study revealed a number of key findings that are important to our increased understanding of IPSDM. Healthcare professionals’ (HCP) views differ about what constitutes IPSDM. The nature of the decision (triage, chronic condition, values sensitive) is an important influencing factor for IPSDM. Four key roles were identified as essential to the IPSDM process: professional expert, leader, synthesizer and parent. IPSDM involves collaboration, sharing, weighing and building consensus to overcome diversity. HCPs use persuasive knowledge exchange strategies to ensure their voices are heard during IPSDM. Buffering power differentials and increasing agreement about best options lead to well-informed decisions. A model was developed to illustrate the relationships among these concepts. Conclusions: Findings from this study improve understanding of how different members of the team participate in the IPSDM process, and highlight effective strategies to ensure professional voices are heard, understood and considered during deliberations.

This thesis investigates the process of communication between a person who has in-depth and technical knowledge about certain items and a person who has very broad and non-technical knowledge. For example, a doctor has detailed knowledge about all types of diseases, whereas, an ordinary person only knows a few common type of them. People use categories to communicate; the language, which is used in communication, is categorical. In addition, knowledge can be expressed in categories, and the categories are formed based on the knowledge that the person has. If the person has a superficial knowledge about a specific subject, he then creates superficial categories; whereas, if he has in-depth knowledge, he creates detailed and technical categories. The communication process between a person with technical categories of knowledge and a person with non-technical categories can be presented by the way that they match their categories. Shared cognition is formed if a category exists or is formed that is completely understandable for both parties. Literature on communication studies have never focused on the way that people with categorical knowledge communicate; therefore, an exploratory study is designed to figure out the process of communication when people have categorical knowledge. The task that is used in this study simulates the situation that two persons with categorical knowledge are communicating. The results of this thesis introduce a new representation for the communication process between a technical and non-technical communicators and the way that shared cognition can be analyzed.

This thesis investigates the process of communication between a person who has in-depth and technical knowledge about certain items and a person who has very broad and non-technical knowledge. For example, a doctor has detailed knowledge about all types of diseases, whereas, an ordinary person only knows a few common type of them. People use categories to communicate; the language, which is used in communication, is categorical. In addition, knowledge can be expressed in categories, and the categories are formed based on the knowledge that the person has. If the person has a superficial knowledge about a specific subject, he then creates superficial categories; whereas, if he has in-depth knowledge, he creates detailed and technical categories. The communication process between a person with technical categories of knowledge and a person with non-technical categories can be presented by the way that they match their categories. Shared cognition is formed if a category exists or is formed that is completely understandable for both parties. Literature on communication studies have never focused on the way that people with categorical knowledge communicate; therefore, an exploratory study is designed to figure out the process of communication when people have categorical knowledge. The task that is used in this study simulates the situation that two persons with categorical knowledge are communicating. The results of this thesis introduce a new representation for the communication process between a technical and non-technical communicators and the way that shared cognition can be analyzed.