Browsing by Subject "Trees"
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Item A groupware interface to a shared file system(Texas A&M University, 2005-02-17) Faltemier, Timothy CollinCurrent shared file systems (NFS and SAMBA) are based on the local area network model. To these file systems, performance is the major issue. However, as the Internet grows, so does the distance between users and the Local Area Network. With this increase in distance, the latency increases as well. This creates a problem when multiple users attempt to work in a shared environment. Traditionally, the only way to collaborate over the Internet required the use of locks. These requirements motivated the creation of the State Difference Transformation algorithm that allows users non-blocking and unconstrained interaction across the Internet on a tree based structure. Fine Grain Locking, on the other hand, allows a user the ability to set a lock on a character or range of characters while using a form of the transformation algorithm listed above. This thesis proposes an implementation that integrates these two technologies as well as demonstrating the effectiveness and flexibility of State Difference Transformation. The implementation includes two applications that can be used to further research in both the transformation and locking communities. The first application allows users to create tests for SDT and Fine Grain Locking and verify the correctness of the algorithms in any given situation. The second application then furthers this research by creating a real-world groupware interface to a shared file system based on a clientserver architecture. This implementation demonstrates the usability and robustness of these algorithms in real world situations.Item Fungal community structure and microbial biomass in a semi-arid environment: roles in root decomposition, root growth, and soil nitrogen dynamics(Texas Tech University, 1996-05) Zhang, QishuiAlthough the roles of fiingi in ecosystems are recognized, few studies have examined the enzymatic activities of fungi during plant litter decomposition and the changes in species composition of microbial communities as they influence soil nutrient levels, root growth, and plant litter decomposition in a semi-arid or arid environment. To examine aspects of the potential linkages among plant growth, soil levels, and microbial activities in a semi-arid environment, five 40-m transects were established in a sand shinnery-oak (Ouercus havardii Rydb.) ecosystem in West Texas in 1993. Along these transects, species conqx)sition of fungal communities and community-level enzymatic activities were evaluated during decomposition of fine roots of sand shinnery-oak. Soil microbial biomass and nitrogen transfonnation processes were evaluated along the transects to establish the linkages between plant density, microbially mediated processes, and nutrient availability. Temporal pattems of ectomycorrhizal colonization levels and fine root production also were estimated to integrate microbial enzymatic activities, nutrient fluxes, and root growth. In response to results obtained during the fall of 1993 and spring of 1994, a nitrogen addition experiment was established to examine the effects of nitrogen on amount of soil microbial biomasscarbon, net nitrogen mineralization rates, fine root production and ectomycorrhizal colonization levels. To better understand the strengths of the interrelationships among root growth, nutrient fluxes and microbial enzymatic activities, conceptual models exploring the relationships were developed and evaluated using path analysis.