The impact of leadership capacity and style on professional learning communities in schools.

The impact of leadership capacity and style on professional learning communities in schools.

Date: December 2008
Creator: Scoggins, Kimberly Travis
Description: Leadership capacity may be enhanced when school staff members work together as a professional learning community (PLC). Leadership style may impact how well a school staff work as a professional learning community. The purpose of this study was to assess the relationship between principal leadership style and the level of PLC on 18 campuses across the US that were working on becoming PLCs. Staff members answered questions from two surveys which measured the level of leadership capacity, leadership style of the principal, and level of professional learning community within the schools. Questions regarding leadership capacity and leadership style were taken from the Leadership Capacity School Survey. Questions designed to measure the level of PLC on a campus were taken from the Professional Learning Community Assessment. The product-moment correlation coefficient or Pearson r was calculated between the answers from the questions from both surveys. The results indicated that when a capacity building principal is working with staff members to create a PLC, a higher level of PLC development is evidenced. When principals used collaboration with their staff, their schools operated at a lower level as a PLC. These results encourage principals to consider building capacity among their staff members if they ...
Contributing Partner: UNT Libraries
Capacity and Throughput Optimization in Multi-cell 3G WCDMA Networks

Capacity and Throughput Optimization in Multi-cell 3G WCDMA Networks

Date: December 2005
Creator: Nguyen, Son
Description: User modeling enables in the computation of the traffic density in a cellular network, which can be used to optimize the placement of base stations and radio network controllers as well as to analyze the performance of resource management algorithms towards meeting the final goal: the calculation and maximization of network capacity and throughput for different data rate services. An analytical model is presented for approximating the user distributions in multi-cell third generation wideband code division multiple access (WCDMA) networks using 2-dimensional Gaussian distributions by determining the means and the standard deviations of the distributions for every cell. This model allows for the calculation of the inter-cell interference and the reverse-link capacity of the network. An analytical model for optimizing capacity in multi-cell WCDMA networks is presented. Capacity is optimized for different spreading factors and for perfect and imperfect power control. Numerical results show that the SIR threshold for the received signals is decreased by 0.5 to 1.5 dB due to the imperfect power control. The results also show that the determined parameters of the 2-dimensional Gaussian model match well with traditional methods for modeling user distribution. A call admission control algorithm is designed that maximizes the throughput in multi-cell ...
Contributing Partner: UNT Libraries
Impact of actual interference on capacity and call admission control in a CDMA network.

Impact of actual interference on capacity and call admission control in a CDMA network.

Date: May 2004
Creator: Parvez, Asad
Description: An overwhelming number of models in the literature use average inter-cell interference for the calculation of capacity of a Code Division Multiple Access (CDMA) network. The advantage gained in terms of simplicity by using such models comes at the cost of rendering the exact location of a user within a cell irrelevant. We calculate the actual per-user interference and analyze the effect of user-distribution within a cell on the capacity of a CDMA network. We show that even though the capacity obtained using average interference is a good approximation to the capacity calculated using actual interference for a uniform user distribution, the deviation can be tremendously large for non-uniform user distributions. Call admission control (CAC) algorithms are responsible for efficient management of a network's resources while guaranteeing the quality of service and grade of service, i.e., accepting the maximum number of calls without affecting the quality of service of calls already present in the network. We design and implement global and local CAC algorithms, and through simulations compare their network throughput and blocking probabilities for varying mobility scenarios. We show that even though our global CAC is better at resource management, the lack of substantial gain in network throughput and ...
Contributing Partner: UNT Libraries
Resource Management in Wireless Networks

Resource Management in Wireless Networks

Date: August 2006
Creator: Arepally, Anurag
Description: A local call admission control (CAC) algorithm for third generation wireless networks was designed and implemented, which allows for the simulation of network throughput for different spreading factors and various mobility scenarios. A global CAC algorithm is also implemented and used as a benchmark since it is inherently optimized; it yields the best possible performance but has an intensive computational complexity. Optimized local CAC algorithm achieves similar performance as global CAC algorithm at a fraction of the computational cost. Design of a dynamic channel assignment algorithm for IEEE 802.11 wireless systems is also presented. Channels are assigned dynamically depending on the minimal interference generated by the neighboring access points on a reference access point. Analysis of dynamic channel assignment algorithm shows an improvement by a factor of 4 over the default settings of having all access points use the same channel, resulting significantly higher network throughput.
Contributing Partner: UNT Libraries
Approximating User Distributions in WCDMA Networks Using 2-D Gaussian

Approximating User Distributions in WCDMA Networks Using 2-D Gaussian

Date: July 2005
Creator: Nguyen, Son & Akl, Robert G.
Description: This paper discusses approximating user distributions in WCDMA networks using 2-D Gaussian.
Contributing Partner: UNT College of Engineering
Effects of Interference on Capacity in Multi-Cell CDMA Networks

Effects of Interference on Capacity in Multi-Cell CDMA Networks

Date: March 2005
Creator: Akl, Robert G.; Parvez, Asad & Nguyen, Son
Description: This article discusses the effects of interference on capacity in multi-cell CDMA networks.
Contributing Partner: UNT College of Engineering
Impact of Interference Model on Capacity in CDMA Cellular Networks

Impact of Interference Model on Capacity in CDMA Cellular Networks

Date: May 2004
Creator: Akl, Robert G. & Parvez, Asad
Description: This paper discusses an impact of interference model on capacity in CDMA cellular networks.
Contributing Partner: UNT College of Engineering