京都大学 / 0048 / 新制・課程博士 / 博士(情報学) / 甲第19132号 / 情博第578号 / 新制||情||101(附属図書館) / 32083 / 京都大学大学院情報学研究科通信情報システム専攻 / (主査)教授 高橋 達郎, 教授 原田 博司, 教授 梅野 健 / 学位規則第4条第1項該当 / Doctor of Informatics / Kyoto University / DFAM

Thesis (Ed. D.)--University of Kentucky, 2002. / Title from document title page. Document formatted into pages; contains xix, 175 p. : ill. Includes abstract. Includes bibliographical references (p. 160-173).

The Open Access movement seeks to make scholarly, peer-reviewed journal articles freely available to anyone, anywhere over the World Wide Web. There were some very significant developments in the area of Open Access (OA) in 2004, including statements by major funders in support of Open Access. There are now so many Open Access scholarly journal articles freely available, that, in the author’s opinion, being aware of, and using, the resources and related tools is now essential for libraries. Libraries can provide more resources faster for users by supplementing paid resources with ones that are Open Access. Library resources, such as link resolvers, are beginning to incorporate Open Access materials and web searches for Open Access materials. For example, the reSearcher software suite includes Open Access collections along with subscription-based resources in the CUFTS journals knowledgebase, and a web search for an Open Access copy of an article in the GODOT link resolver. SFX also incorporates Open Access journals. After exhausting more traditional resources, interlibrary loans staff are beginning to include Google searching in their workflow. This article will discuss what Open Access is, the dramatic growth of Open Access, and major collections, resources and tools. Implications, issues, and leadership opportunities for resource sharing specialists will be explored.

The Internet is a new tool for mobilization, communication, and articulation of social movement organizational framings of events and ideologies. The White Supremacist/Separatist Movement has had, and remains, a significant presence on the Internet. There are several hundred sites operating, representing almost every faction of the movement. Hyperlinks between sites allow the ideological resources (content of sites, online libraries, radio shows, etc.) offered by one group to be available to many groups, regardless of geography. Importantly, links are often asymmetrical and more prestigious sites have many "in" links. This movement has considerable diversity of beliefs, goals, tactics, and resources. Movements vary in the richness of symbolic resources available on their web sites. I operationalize "resource richness" as the amount and coverage of content on a website. Groups also exhibit a range of tactical orientations ranging from peaceful (education) to extremely violent (race war). Using network analysis, I investigate the structure of ties in the White Supremacist/Separatist Movement industry on the Internet. Through this method, analyses reveals patterns of sharing of ideological resources. I examine how ideological and tactical affinities structure the scope, density, and patterns of cybernetworks in the White Supremacist/Separatist Movement industry.

There is a rapidly growing number of advanced applications running over the internet that requires ultra-low latency and high throughput. Bufferbloat is one of the most known problems which add delay in the form of packets being enqueued into large buffers before being transmitted. This has been solved with the developments of various Active Queue Management (AQM) schemes to control how large the queue buffers are allowed to grow. Another aspect that is important today is how the available bandwidth can be shared between applications with different priorities. The Per-Packet Value (PPV) concept has been presented as a solution for resource-sharing by marking packets according to predefined marking policies. The packet value will be taken into consideration to make drop/mark decisions, which leads to higher packet values being prioritized at bottleneck links.  In this thesis, a design of a packet value-based AQM on a programmable Barefoot Tofino switch will be presented. It will use a combination of the Proportional Integral Controller (PIE) AQM scheme and the PPV concept to make drop decisions when queuing delay is discovered. Packet value statistics are collected through the P4 programmable data plane to maintain knowledge about the distribution of packet values. With the dropping probability calculated through the PIE AQM scheme, a decision can be made about which packets should be dropped.  An evaluation shows that with the implemented PV AQM, a low queuing delay can be achieved by dropping an appropriate amount of packets. It also shows that the PV AQM controls the resource-sharing between different traffic flows according to a predefined marking policy.

The increased demand for broadband communications has led to the rapid development of the conventional terrestrial and satellite wireless communications systems. One of the main challenges to next generation wireless systems is to deliver high-capacity and cost-efficient solutions to cope with an increasing usage of broadband services and applications. In the recent years, an emerging competitive system has attracted the attention for providing wireless broadband communications and other services based on quasi-stationary aerial platforms operating in the stratosphere known by high altitude platforms (HAPs), and located 17-22 km above the earth surface. This solution has been described by the International Telecommunication Union (ITU) as "a new and long anticipated technology that can revolutionize the telecommunication industry''. The HAP systems provide important advantages such as low cost, high elevation angles, low propagation delay, easy and incremental deployment, flexibility in operation, broad coverage, broadcast and broadband capability, ability to move around in emergency situations, etc. Therefore, they have been proposed by ITU for the provision of fixed, mobile services and applications, e.g. the third generation (3G) services licensed by ITU and backbone link for terrestrial networks in remote areas. This thesis explores and investigates the wireless communication and techno-economic performance of terrestrial systems and HAPs. An overview of research and development on aerial platforms worldwide is given. Coexistence performance and techniques of heterogeneous systems to provide broadband wireless communications based on Worldwide Interoperability Microwave Access (WiMAX) are investigated. A heterogeneous scenario is developed to examine the coexistence performance of heterogeneous systems. The capacity and deployment aspects of HAPs are analyzed, and further compared with terrestrial Universal Mobile Telecommunications Systems (UMTS) through techno-economic studies including a proposed partnership based business model for HAPs. Performance of wireless sensor network applications via HAPs is also investigated, and shows the high potential of HAPs for large-area and long-endurance surveillance and emergency applications. The thesis shows that communications from the aerial platforms provide the best features of both terrestrial and satellite systems. HAPs can effectively coexist in a heterogeneous radio environment, and are competitive solutions in urban and suburban scenarios in terms of capacity, coverage and business perspective. This makes HAP a viable competitor and complement to conventional terrestrial infrastructures and satellite systems.

Climate change has begun to affect the frequency, intensity, and duration of weather related disaster events. This trend may foster a greater probability of encountering 2 or more disaster events simultaneously, increasing the potential to deplete emergency resources. Using Canadian forest fire management as a focal point, this research has determined the extent to which forest fire resource sharing (resources being equipment, fire fighter teams, planes, etc.) has been able to mitigate the impacts of simultaneous forest fire events induced by climate change. Provincial and territorial forest fire management agencies are responsible for forest fire suppression within their jurisdictions, but when fires exceed their suppression capabilities they may request resources from other agencies using resource sharing agreements including: Compact agreements with American States, other international agreements and agreements initiated through the Canadian Interagency Forest Fire Center (CIFFC). If the potential for simultaneous forest fires is neglected, excess fire activity may overwhelm the resource sharing structure. A historical analysis, 2 case studies, and a survey were employed to uncover information regarding simultaneous forest fires. Moreover, an examination of other resource sharing disciplines was used to uncover new ways of approaching resource sharing issues. The results of this study show that simultaneous fire events have overwhelmed the resource sharing system (during at least two years 1998 and 2003) and that modifications are needed to prepare for the potential increase in forest fire frequency.

Poster presented at ALA Annual Conference 2013, Chicago, IL / As the University of Arizona Libraries employ a 21st century user-centered approach to information resource management, we have adopted a Patron-Driven Acquisitions program. Fundamentally, the program is based on the model of users as the drivers of library acquisitions. By embedding order records in the library catalog and by identifying user needs through interlibrary loan requests, the library is able to acquire targeted information resources that more efficiently meet the research needs of our users. This service significantly enhances the user experience and allows the UA Libraries to see greater use of our resources.

Knowledge is an asset that can give an organization competitive edge. However, knowledge creation is an expensive activity. One of the reasons organizations form knowledge creation collaborations is to share resources that are needed to create knowledge. This dissertation models the dyadic collaborations as games between the partners and arrives at resource-sharing schemes for them. Specifically, the collaborations are modeled as two games- Stackelberg Leader-Follower game and Partnership game. The types of collaborations are distinguished based on the nature of the marginal return functions with respect to knowledge creation investments for each of the collaborating organizations. Three essays are presented and discussed. In Essay 1, collaborations between organizations characterized by decreasing marginal returns with respect to investments are modeled as a partnership game. In Essay 2, collaborations between organizations characterized by increasing marginal returns with respect to investments are modeled as a Stackelberg Leader-Follower game. In Essay 3, collaborations where the leader organization is characterized by decreasing marginal returns with respect to investment and the follower organization is characterized by increasing marginal returns with respect to investments are studied. The solutions for the game in terms of the participation rate, knowledge creation investments, and the system gain are presented for each essay. The results are analyzed and the observations are stated as propositions. The propositions provide guidelines for collaborating organizations to arrive at a resource-sharing scheme. Additionally, the results suggest conditions under which the potential partners collaborate specifically with respect to the participation rate and the system gain. The results of Essays 2 and 3 provide conditions for participation rate. The results of Essay 3 provide the conditions of expected system gain under which the follower organization will collaborate with a potential leader organization. The results have implications for several stages of the alliance management process such as partner selection, gauging the behavior of potential and current partners, and renegotiation of alliance terms.

This report describes my M.A.Sc. thesis research work. The emerging 4th generation (4G) mobile systems and networks (so called 4G HetNets) are designed as multilayered cellular topology with a number of asymmetrically located, asymmetrically powered, self-organizing, and user-operated indoor small cell (e.g., pico/femto cells and WLANs) with a variety of cell architectures that are overlaid by a large cell (macro cell) with some or all interfering wireless links. These designs of 4G HetNets bring new challenges such as increased dynamics of user mobility and data traffic trespassing over the multi-layered cell boundaries. Traditional approaches of radio resource allocation and inter-cell (cochannel) interference management that are mostly centralized and static in the network core and are carried out pre-hand by the operator in 3G and lower cellular technologies, are liable to increased signaling overhead, latencies, complexities, and scalability issues and, thus, are not viable in case of 4G HetNets. In this thesis a comprehensive research study is carried out on improving the radio resource sharing and inter-cell interference management in 4G HetNets. The solution strategy exploits dynamic and adaptive channel allocation approaches such as dynamic and opportunistic spectrum access (DSA, OSA) techniques, through exploiting the spatiotemporal diversities among transmissions in orthogonal frequency division multiple access (OFDMA) based medium access in 4G HetNets. In this regards, a novel framework named as Hybrid Radio Resource Sharing (HRRS) is introduced. HRRS comprises of these two functional modules: Cognitive Radio Resource Sharing (CRRS) and Proactive Link Adaptation (PLA) scheme. A dynamic switching algorithm enables CRRS and PLA modules to adaptively invoke according to whether orthogonal channelization is to be carried out exploiting the interweave channel allocation (ICA) approach or non-orthogonal channelization is to be carried out exploiting the underlay channel allocation (UCA) approach respectively when relevant conditions regarding the traffic demand and radio resource availability are met. Benefits of CRRS scheme are identified through simulative analysis in comparison to the legacy cochannel and dedicated channel deployments of femto cells respectively. The case study and numerical analysis for PLA scheme is carried out to understand the dynamics of threshold interference ranges as function of transmit powers of MBS and FBS, relative ranges of radio entities, and QoS requirement of services with the value realization of PLA scheme.