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RISS 인기검색어
- 검색키워드
- 저자 : Bag, Gargi (검색결과 72 건)
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Network based micro-mobility architecture for 6LoWPAN
Bag, Gargi Ajou Univ. 2010 국내박사
thesis provides an in depth analysis of the existing mobility support protocols in terms of different aspects of mobility management such as location management, handover management, routing, route optimization and security. Also it discusses the goals and mobility requirements of 6LoWPAN. A network based micro-mobility management architecture is proposed for 6LoWPAN. The micro-mobility management architecture embodies three schemes. The first scheme is LoWMob, which is a network based mobility scheme aims to provide mobility support to mobile 6LoWPAN nodes at the adaptation layer of the 6LoWPAN. In order to achieve that, LoWMob proposes to utilize 6LoWPAN’s adaptation layer message format and 16 bit addressing scheme to carry mobility related signaling. A distributed version of LoWMob(DLoWMob) is proposed in order to distribute the traffic concentration at the gateway. Route Optimization of data packets of two mobile nodes located in the same PAN is also considered. A security scheme is also proposed in order to provide mutual authentication of the MN and a PAN and to secure MN’s data packets. The third scheme is LoWPMIPv6 which is a lightweight implementation of PMIPv6 (LoWPMIPv6) for 6LoWPAN. It provides mobility support at the network layer and proposes compression of mobility related messages in order to reduce the overhead on the PAN nodes. The three schemes (LoWMob, DLoWMob and LoWPMIPv6) is then compared in order determine their suitability for 6LoWPAN. The performance of our proposed schemes is evaluated in terms of mobility signaling costs, end-to-end delay, and packet success ratio both in Qulanet and analytically.
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Bag, Santanu Northwestern University 2009 해외박사(DDOD)
The work of this dissertation is focused on (1) investigating solution equilibria of soluble metal-chalcogenide building blocks and their role in making well-ordered mesostructures, (2) creating porous metal-chalcogenide frameworks out of well-defined molecular building units, (3) generalizing the synthetic route, (3) investigating their emerging unique properties, and (4) exploring their possible applications. Surfactant directed assembly of metal chalcogenide building units was shown as a method to construct semiconducting mesostructured materials. The solvent dependence solution equilibria of [Ge2Se6] 4- and [GeSe4]4- were studied in details and it has been observed that the presence of multiple building units favors the construction of highly hexagonal mesostructures with Pt2+. Both surfactant head group and chain length were varied systematically to study their effect on the long range order and optoelectronic properties of the final mesostructures. A simple metathesis reaction was applied for the first time to generate a broad class of metal-chalcogenide gels and aerogels. It was shown how various chalcogenido clusters, when bound to Pt2+ in water, yield gels having porous frameworks. These gels, referred to as 'chalcogels', were transformed to aerogels after supercritical drying with carbon dioxide. The aerogels possess very high internal surface area, up to 327 m2 /g, with tunable energy gaps between 0.2 and 2.0 eV, and preferentially absorb heavy metal ions. The successful synthesis of highly active phases made of Co(Ni)/Mo(W)/S for hydrodesulfurization process, was achieved through the extension of this sol-gel chemistry. The soft chalcogenide surfaces of these low density aerogel networks can absorb conjugated organic molecules, mercury ions, and can preferentially absorb CO2 over H2. The use of a metathesis reaction to generate metal chalcogenide aerogels was extended to other main group (e.g. Sb3+, Sn2+) and transition metal ions (e.g. Mn2+, Fe2+, Co2+, Ni2+, Zn2+) and different building units such as [SnS4]4-, [SnSe4] 4-, [Sn2Se6]4-, [SbSe4] 3-, [Sn2S6]4- and [P2S 6]4-. Use of ligated metal ions and formamide as a solvent helps to slow down the reaction and forms an extended polymeric network. Aerogel frameworks made of heavier elements with high surface polarizability showed higher gas separation performance.
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Bag, Sudeep Washington State University 2013 해외박사(DDOD)
Iris yellow spot tospovirus (IYSV) (genus Tospovirus, family Bunyaviridae), transmitted by Thrips tabaci L. causes an economically important disease in both onion bulb and seed crop in the USA and other onion-growing regions of the world. Onion thrips as a pest alone can cause up to >60 % crop loss. Besides Allium spp, several weeds were found to be hosts of IYSV. IYSV isolates collected from different states in the USA were evaluated to determine the existence of biologically distinct strains. On the basis of the ability to cause systemic infection, disease severity, senescence and death of the inoculated plants, isolates were delineated as mild or severe isolates. Since the genome structure of only the small (S) RNA of IYSV was known, the large (L) and medium (M) RNAs of the virus were sequenced. The L RNA was 8,880 nucleotides in length, coding the 331.17 kDa RNA-dependent RNA polymerase in the viral complementary (vc) strand. The M RNA was 4,817 nucleotides long coding the movement protein (34.7kDa) in the viral sense and the glycoprotein precursor (128.4 kDa) in the vc strand. An ELISA protocol was developed for detecting IYSV in single adult thrips using a polyclonal antiserum produced against the nonstructural protein (NSs) coded by the small (S) RNA. The approach enabled estimating the proportion of viruliferous thrips among the field-collected thrips. This will help better understand the epidemiology of IYSV. To understand the molecular basis of the emergence of new tospoviruses, a system was developed to study virus-virus interactions. It was found that two distinct and economically important tospoviruses, IYSV and Tomato spotted wilt virus (TSWV) complement each other to overcome host defense. The small RNA expression profiles of IYSV and TSWV in single-and dually-infected datura plants showed that systemic leaves of dually-infected plants had reduced levels of TSWV N gene-specific small interfering RNAs (siRNAs). This identifies a new role for the viral gene silencing suppressor in potentially modulating the biology and host range of viruses and underscores the important role of virally-coded suppressors of gene silencing in virus infection of plants.
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