Time filter

Source Type

Jackson, MS, United States

Jackson State University is a historically black university in Jackson, Mississippi, United States. Founded in 1877 in Natchez, Mississippi as Natchez Seminary by the American Baptist Home Mission Society of New York, the Society moved the school to Jackson in 1882, renaming it Jackson College, and developed its present campus in 1902. It became a state-supported public institution in 1940, and it is a member of the Thurgood Marshall College Fund. Wikipedia.

Meghanathan N.,Jackson State University
International Journal of Communication Networks and Information Security | Year: 2013

A cognitive radio (CR) is a radio that can change its transmission parameters based on the perceived availability of the spectrum bands in its operating environment. CRs support dynamic spectrum access and can facilitate a secondary unlicensed user to efficiently utilize the available underutilized spectrum allocated to the primary licensed users. A cognitive radio network (CRN) is composed of both the secondary users with CR-enabled radios and the primary users whose radios need not be CR-enabled. Most of the active research conducted in the area of CRNs has been so far focused on spectrum sensing, allocation and sharing. There is no comprehensive review paper available on the strategies for medium access control (MAC), routing and transport layer protocols, and the appropriate representative solutions for CRNs. In this paper, we provide an exhaustive analysis of the various techniques/mechanisms that have been proposed in the literature for communication protocols (at the MAC, routing and transport layers), in the context of a CRN, as well as discuss in detail several security attacks that could be launched on CRNs and the countermeasure solutions that have been proposed to avoid or mitigate them. This paper would serve as a good comprehensive review and analysis of the strategies for routing and transport protocols and security issues for CRNs as well as would lay a strong foundation for someone to further delve onto any particular aspect in greater depth. Source

Gu J.,CAS Shanghai Institute of Materia Medica | Leszczynski J.,Jackson State University | Schaefer III H.F.,University of Georgia
Chemical Reviews | Year: 2012

The broadest motivation for exploring electron attachment to biological molecules comes from their important role in radiation damage. An electron trapped by a neutral molecule results in the corresponding radical anion. The energy difference between the neutral molecule and the corresponding radical anion is referred to as the electron affinity (EA). The EA is an important physical measurable quantity often used in theoretical and experimental descriptions of electron attachment to a molecule. From a theoretical viewpoint, an electron residing in a molecule leads to changes in the nuclear configuration to form an equilibrium structure for the corresponding radical anion. The VAE is the energy released from the instantaneous one electron attachment to a neutral species. No geometry relaxation takes place during this process. Therefore, both neutral and anionic molecules reflect the optimized geometry of the neutral species. Source

This paper discusses a new location prediction based routing (LPBR) protocol for mobile ad hoc networks (MANETs) and its extensions for multicast and multi-path routing. The objective of the LPBR protocol is to simultaneously minimize the number of flooding-based route discoveries as well as the hop count of the paths for a source-destination (s-d) session. During a regular flooding-based route discovery, LPBR collects the location and mobility information of nodes in the network and stores the collected information at the destination node of the route search process. When the minimum-hop route discovered through flooding fails, the destination node locally predicts a global topology based on the location and mobility information collected during the latest flooding-based route discovery and runs a minimum-hop path algorithm. If the predicted minimum-hop route exists in reality, no expensive flooding-based route discovery is needed and the source continues to send data packets on the discovered route. Similarly, we propose multicast extensions of LPBR (referred to as NR-MLPBR and R-MLPBR) to simultaneously reduce the number of tree discoveries and the hop count per path from the source to each multicast group receiver. Nodes running NR-MLPBR are not aware of the receivers of the multicast group. R-MLPBR assumes that each receiver node also knows the identity of the other receiver nodes of the multicast group. Finally, we also propose a node-disjoint multi-path extension of LPBR (referred to as LPBR-M) to simultaneously minimize the number of multi-path route discoveries as well as the hop count of the paths. © 2011 Elsevier B.V. All rights reserved. Source

A study that was conducted to examine size and shape dependent second order nonlinear optical properties of nanomaterials and their application in biological and chemical sensing is presented. Benzil was the first material that proved relatively easy to grow into large single crystals. Over the last two decades the study of nonlinear optical processes in organic and polymer systems has enjoyed rapid and sustained growth. Nonlinear optics deals with the interaction of applied electromagnetic fields in various materials, which generates new electromagnetic fields altered in frequency, phase, or other physical properties. A nanoparticle has a rather large number of atoms, but its size is comparable, with characteristic dimensions describing the behavior of electrons and holes, thus creating an intermediate regime between molecules and bulk crystals. Source

Mawson A.R.,Jackson State University
Cancer Management and Research | Year: 2012

Primary brain tumors are among the top ten causes of cancer-related deaths in the US. Malignant gliomas account for approximately 70% of the 22,500 new cases of malignant primary brain tumors diagnosed in adults each year and are associated with high morbidity and mortality. Despite optimal treatment, the prognosis for patients with gliomas remains poor. The use of retinoids (vitamin A and its congeners) in the treatment of certain tumors was originally based on the assumption that these conditions were associated with an underlying deficiency of vitamin A and that supplementation with pharmacological doses would correct the deficiency. Yet the results of retinoid treatment have been only modestly beneficial and usually short-lived. Studies also indicate that vitamin A excess and supplementation have pro-oxidant effects and are associated with increased risks of mortality from cancer and other diseases. The therapeutic role of vitamin A in cancer thus remains uncertain and a new perspective on the facts is needed. The modest and temporary benefits of retinoid treatment could result from a process of feedback inhibition, whereby exogenous retinoid temporarily inhibits the endogenous synthesis of these compounds. In fact, repeated and/or excessive exposure of the tissues to endogenous retinoic acid may contribute to carcinogenesis. Gliomas, in particular, may result from an imbalance in retinoid receptor expression initiated by environmental factors that increase the endogenous production of retinoic acid in glia. At the receptor level, it is proposed that this imbalance is characterized by excessive expression of retinoic acid receptor-α(RARα) and reduced expression of retinoic acid receptor-β (RARβ). This suggests a potential new treatment strategy for gliomas, possibly even at a late stage of the disease, ie, to combine the use of a RARα antagonist and a RARβ agonist. According to this hypothesis, the RAR α antagonist would be expected to inhibit RARa-induced gliomas, while the RARβ agonist would suppress tumor growth and possibly contribute to the regeneration of normal glia. © 2012 Mawson, publisher and licensee Dove Medical Press Ltd. Source

Discover hidden collaborations