Millimeter-wave Evolution for 5G Cellular Networks

Triggered by the explosion of mobile traffic, 5G (5th Generation) cellular network requires evolution to increase the system rate 1000 times higher than the current systems in 10 years. Motivated by this common problem, there are several studies to integrate mm-wave access into current cellular networks as multi-band heterogeneous networks to exploit the ultra-wideband aspect of the mm-wave band. The authors of this paper have proposed comprehensive architecture of cellular networks with mm-wave access, where mm-wave small cell basestations and a conventional macro basestation are connected to Centralized-RAN (C-RAN) to effectively operate the system by enabling power efficient seamless handover as well as centralized resource control including dynamic cell structuring to match the limited coverage of mm-wave access with high traffic user locations via user-plane/control-plane splitting. In this paper, to prove the effectiveness of the proposed 5G cellular networks with mm-wave access, system level simulation is conducted by introducing an expected future traffic model, a measurement based mm-wave propagation model, and a centralized cell association algorithm by exploiting the C-RAN architecture. The numerical results show the effectiveness of the proposed network to realize 1000 times higher system rate than the current network in 10 years which is not achieved by the small cells using commonly considered 3.5 GHz band. Furthermore, the paper also gives latest status of mm-wave devices and regulations to show the feasibility of using mm-wave in the 5G systems.Comment: 17 pages, 12 figures, accepted to be published in IEICE Transactions on Communications. (Mar. 2015

The instanton method and its numerical implementation in fluid mechanics

A precise characterization of structures occurring in turbulent fluid flows at high Reynolds numbers is one of the last open problems of classical physics. In this review we discuss recent developments related to the application of instanton methods to turbulence. Instantons are saddle point configurations of the underlying path integrals. They are equivalent to minimizers of the related Freidlin-Wentzell action and known to be able to characterize rare events in such systems. While there is an impressive body of work concerning their analytical description, this review focuses on the question on how to compute these minimizers numerically. In a short introduction we present the relevant mathematical and physical background before we discuss the stochastic Burgers equation in detail. We present algorithms to compute instantons numerically by an efficient solution of the corresponding Euler-Lagrange equations. A second focus is the discussion of a recently developed numerical filtering technique that allows to extract instantons from direct numerical simulations. In the following we present modifications of the algorithms to make them efficient when applied to two- or three-dimensional fluid dynamical problems. We illustrate these ideas using the two-dimensional Burgers equation and the three-dimensional Navier-Stokes equations

Technology Needs Assessment of an Atmospheric Observation System for Multidisciplinary Air Quality/Meteorology Missions, Part 2

The technology advancements that will be necessary to implement the atmospheric observation systems are considered. Upper and lower atmospheric air quality and meteorological parameters necessary to support the air quality investigations were included. The technology needs were found predominantly in areas related to sensors and measurements of air quality and meteorological measurements

Analytical and experimental investigation of sidelobe suppression techniques for reflector type spacecraft antenna Final technical report

Near axis sidelobe suppression techniques for circularly polarized reflector type spacecraft antenna

ASSESSING THE EFFECTIVENESS OF A COMBAT UGV SWARM IN URBAN OPERATIONS

Due to its complexity, an urban area is a challenging multi-dimensional environment for ground warfare. Recent technological advancements have enabled militaries to utilize different-size unmanned ground vehicles (UGV) to support a variety of missions. This thesis presents guidance algorithms for a search and kill mission developed for some generic UGV swarms, which may be an attractive application, particularly for smaller UGVs operating in an urban environment. Through a series of computer simulations, the research evaluates the feasibility and effectiveness of the algorithms in executing such a mission in indoor and outdoor urban environments. The developed simulation allows varying many parameters, thus achieving closeness to the real-world situation when different environments, platforms, sensors, and weapons are used. Computer simulations presented in this paper may also assist military leaders in choosing key mission parameters to maximize the outcome of potential future engagements.http://archive.org/details/assessingtheeffe1094560354Outstanding ThesisArmy, SingaporeApproved for public release; distribution is unlimited

"My SocioWorld" : an optimized application for mobile social networking

Being connected with old social contacts and making new social contacts on social networking sites is becoming more essential these days. Mobile social networking is adding value towards socializing world by being connected any day, anywhere, anytime and on the go. Applications providing good user experience and taking full advantage of increasing capabilities of mobile phones are still challenging. The common challenges faced by user while using different social networking sites on mobile phone are; increased level of concentration, limited mobile display and rising cost of mobile communication. Ultimately all these affect users’ engagement in mobile social networking. In this thesis, the focus is to propose an optimize application for mobile social networking by adopting user centred design methodology. It involves integration of users’ favourite social networking sites that would facilitate them in socializing with different social networking services from one common user-interface. Further the involvement of users with proposed application is supported by the changing trends of mobile phones by becoming full-featured mobile computers. Several iterative user-interface designs are represented graphically and interaction with those designs is displayed. The proposed application focuses on different ways user could remain active on this application and be able to create new content easily with the help of integrated mobile tools available within smart phone mobile device. Additionally, a usability test is performed with the potential users to validate proposed application. Based on feedbacks and suggestions from the users who performed usability test, further enhancements are made to improve the end-user experience. Thus, by considering the needs and requirements of the end-users the proposed application has been developed to provide enhanced user usability and satisfaction for today’s mobile social networking

Strategies to Improve the User Experience

Libraries are increasingly embracing user experience (UX) and user-centered design principles to improve the satisfaction and success of library users. Electronic resources management can utilize such principles to better support users as they interact with the library's website and its electronic resources. In this column, four academic librarians discuss strategies libraries can employ to improve the user experience. These strategies include utilizing basic UX principles when designing sites and interfaces; analyzing quantitative data to inform the library on how such sites are being used; recruiting strategies for library user studies; and, finally, a call to move to a more unified user experience and to work more closely with vendors on improvements to help users succeed