106,543 research outputs found
Łódź / Geripp: T. Kaindl u. Offic. J. Krainz ; Terrain: Offic. F. Simon u. Assist. Ad. Härtel
No full textŁÓDŹ / GERIPP: T. KAINDL U. OFFIC. J. KRAINZ ; TERRAIN: OFFIC. F. SIMON U. ASSIST. AD. HÄRTEL
General-Karte von Mittel-Europa (-)
Łódź / Geripp: T. Kaindl u. Offic. J. Krainz ; Terrain: Offic. F. Simon u. Assist. Ad. Härtel (37°52°) ( -
Link stability estimation based on link connectivity changes in mobile ad-hoc networks
No full textDear Wang,
Re: Link Stability Estimation Based on Link Connectivity Changes in Mobile Ad-hoc Networks
I have not been able to assess if this is an author version peer-reviewed or is it an author version non peer reviewed. Could you please clarify this so I can proceed to add your paper to Spiral. Spiral digital repository only accept peer-reviewed papers.
30/11/12 author has confirmed peer reviewe
Energy efficiency in ad-hoc wireless networks
No full textIn ad-hoc wireless networks, nodes are typically battery-powered, therefore energy limitations are among the critical constraints in ad-hoc wireless networks' development. The approaches investigated in this thesis to achieve energy efficient performance in wireless networks
can be grouped into three main categories.
1. Each wireless network node has four energy consumption states: transmitting, receiving, listening and sleeping states. The power consumed in the listening state is less than the power consumed in the transmitting and receiving states, but significantly greater than that in the sleeping state. Energy efficiency is achieved if as many nodes as possible are put into the sleeping states.
2) Since energy is consumed for transmission nonlinearly in terms of the transmission range, transmission range adjustment is another energy saving approach. In this work, the optimal transmission range is derived and applied to achieve energy efficient performance in a number of scenerios.
3) Since energy can be saved properly arranging the communication algorithms, network topology management or network routing is the third approach which can be utilised in combination with the above two approaches. In this work, Geographical Adaptive Fidelity (GAF) algorithms, clustering algorithms and Geographic Routing (GR) algorithms are all utilised to reduce the energy consumption of wireless networks, such as Sensor Networks and Vehicular Networks.
These three approaches are used in this work to reduce the energy consumption of wireless networks. With the GAF algorithm. We derived the optimal transmission range and optimal grid size in both linear and rectangular networks and as a result we show how the network energy consumptions can be reduced and how the network lifetime can be prolonged. With Geographic Routing algorithms the author
proposed the Optimal Range Forward (ORF) algorithm and Optimal Forward with Energy Balance (OFEB) algorithm to reduce the energy consumption and to prolong the network lifetime. The results show that compared to the traditional GR algorithms (Most Forward within Radius, Nearest Forward Progress), the network lifetime is prolonged. Other approaches have also been considered to improve the networks's energy efficient operation utilising Genetic Algorithms to find the optimal size of the grid or cluster. Furthermore realistic physical layer models, Rayleigh fading and LogNormal fading, are considered in evaluating energy efficiency in a realistic network environment
Realtime multiprocessor for mobile ad hoc networks
No full textJungeblut T, Grünewald M, Porrmann M, Rückert U. Realtime multiprocessor for mobile ad hoc networks. Advances in Radio Science. 2008;6:239-243.This paper introduces a real-time Multiprocessor
System-On-Chip (MPSoC) for low power wireless applications.
The multiprocessor is based on eight 32bit RISC processors
that are connected via an Network-On-Chip (NoC).
The NoC follows a novel approach with guaranteed bandwidth
to the application that meets hard realtime requirements.
At a clock frequency of 100MHz the total power consumption
of the MPSoC that has been fabricated in 180 nm
UMC standard cell technology is 772mW
Recipients' anonymity in multihop ad-hoc networks
No full textMultihop ad-hoc networks have a dynamic topology. Retrieving a route towards a remote peer requires the execution of a recipient lookup, which can publicly reveal sensitive information about him. Within this context, we propose an efficient, practical and scalable solution to guarantee the anonymity of recipients' nodes in ad-hoc networks.Los saltos múltiples de redes ad-hoc tienen una topología dinámica. La recuperación de una ruta hacia un par remoto requiere la ejecución de una búsqueda de destinatarios, que puede revelar públicamente información confidencial. Dentro de este contexto, proponemos una solución
eficiente, práctica y escalable para garantizar el anonimato de los nodos destinatarios en redes ad-hoc.Els salts múltiples de xarxes ad hoc tenen una topologia dinàmica. La recuperació d'una ruta cap a un parell remot requereix l'execució d'una recerca de destinataris, que pot revelar públicament informació confidencial. Dins d'aquest context, proposem una solució eficient, pràctica i escalable per garantir l'anonimat dels nodes destinataris en xarxes ad-hoc
Internet connection method for mobile ad hoc wireless networks
No full textIn recent years, wireless networks with Internet services have become more and
more popular. Technologies which integrate Internet and wireless networks have
extended traditional Internet applications into a more flexible and dynamic
environment. This research work investigates the technology that supports the
connection between a Mobile Ad Hoc Wireless Network (MANET) and the
Internet, which enables the current wireless Internet technologies to provide a
ubiquitous wireless life style.
With detailed analysis of the existing wireless Internet technologies and
MANETs regarding their features and applications, the demand and lack of
research work for an application to provide Internet connection to MANET is
indicated. The primary difficulty for MANET and Internet connection is that the
dynamic features of MANET do not suit the traditional connection methods used
in infrastructure wireless networks. This thesis introduces new concept of the
'Gateway Awareness' (GAW) to the wireless devices in the MANET. GAW is a
new routing protocol designed by the author of this thesis, at the University of
Warwick. Based on GAW, an inclusive definition for the connection method,
which supports the Internet connection and keeps the independency of routing in
MANET, is addressed. Unlike other research work, this method supports the
MANET and Internet communication in both directions. Furthermore, it explores
possible ways of using the Internet as an extension for wireless communications.
The GAW routing method is developed from destination sequenced distance
vector (DSDV) routing protocol. However, it defines a layer of wireless nodes
(known as GAWNs) with exclusive functions for the Internet connection task.
The layer of GAWNs brings a new set of route update and route selection
method. Simulations show that the GAW routing method provides quality
Internet connection performance in different scenarios compared with other
methods. In particular, the connection is completed with minimum effect on the
independent MANET while the routing efficiency and accuracy is guaranteed
M. T. Ciceronis Epistolae Ad Atticum, Ad Brutum, Et Ad Q. Fratrem
No full textM. T. CICERONIS EPISTOLAE AD ATTICUM, AD BRUTUM, ET AD Q. FRATREM
M. T. Ciceronis Epistolae Ad Atticum, Ad Brutum, Et Ad Q. Fratrem ( - )
Cover ( - )
Titelseite (1)
Ad T. Pomponium Atticum. Liber I. (3)
Ad T. Pomponium Atticum. Liber II. (31)
Ad T. Pomponium Atticum. Liber III. (57)
Ad T. Pomponium Atticum. Liber IV. (75)
Ad T. Pomponium Atticum. Liber V. (97)
Ad T. Pomponium Atticum. Liber VI. (119)
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Ad T. Pomponium Atticum. Liber XIV. (317)
Ad T. Pomponium Atticum. Liber XV. (338)
Ad T. Pomponium Atticum. Liber XVI. (358)
T. Pomponii Attici Vita (379)
Ad Brutum. Liber I. - II. (391)
Ad Quintum Fratrem. Liber I. (421)
Ad Quintum Fratrem. Liber II. (445)
Ad Quintum Fratrem. Liber III. (461)
Ad Octavium Epistola. (478)
Graeca Latinis Expressa. (482)
Annotationes. (507
Replicating Ad-recombinants encoding non-myristoylated rather than wild-type HIV Nef elicit enhanced cellular immunity
No full textOBJECTIVE:
To determine if immunization with non-myristoylated nef would elicit enhanced cellular immune responses resulting from improved presentation of Nef peptides by MHC-I on the cell surface, and enhanced T-cell help.
DESIGN:
The myristoylation site of HIV and SIV Nef is required for several Nef functions that modulate the immune response in an infected host, including downregulation of MHC-I, MHC-II, and CD4, and increased expression of the invariant chain on the cell surface. We constructed replication-competent Ad5- and Ad7-HIV recombinants encoding wild-type nef (nefWT) or a nef mutant (nefNM) lacking 19 amino-terminal amino acids, including the myristoylation site, and sequentially immunized chimpanzees mucosally, first with Ad5-HIVnef recombinants and subsequently with Ad7-HIVnef recombinants.
METHODS:
Peripheral blood lymphocytes were evaluated over the immunization course for Nef-specific cellular immune responses by interferon (IFN)-gamma ELISPOT and T-cell proliferation assays. Nef-specific CD4 and CD8 memory T cells that produced intracellular IFN-gamma, interleukin-2, and tumor necrosis factor (TNF)-alpha were assessed by flow cytometry.
RESULTS:
In comparison to immunization with Ad-HIVnefWT, Ad-HIVnefNM elicited statistically significant increases in numbers of IFN-gamma-secreting cells after the Ad7-HIVnefNM immunization and increased T-cell proliferative responses following both Ad5- and Ad7-HIVnefNM immunizations. Nef-specific CD4 and CD8 memory T-cell populations secreting TNF-alpha were also significantly increased in the Ad-HIVnefNM immunization group.
CONCLUSIONS:
The results support the hypothesis that immunization with Ad-recombinants encoding HIVnefNM rather than HIVnefWT elicits enhanced cellular immunity resulting from improved antigen presentation and greater T-cell help
Intake, growth and feed conversion efficiency of finishing beef cattle offered diets based on triticale, maize or grass silages, or ad libitum concentrates
No full textpeer-reviewedThe intake, growth and feed conversion efficiency of finishing cattle offered whole-crop
triticale silage, harvested at different stubble heights, or maize silage, supplemented
with different amounts and forms of crude protein, were compared with those of cattle
offered grass silage or concentrate ad libitum. Ninety-eight continental crossbred steers
(mean (s.d.) initial live weight 509 (38.6) kg) were allocated among 7 treatments in a
randomized complete-block design: triticale silage from a crop harvested to a 14 (TS-L)
or 35 (TS-H) cm high stubble, maize silage supplemented with a low (MS-LS) or high
(MS-HS) protein concentrate, or with approximately half of the supplementary crude
protein replaced by urea (MS-SU), grass silage (GS) or concentrate offered ad libitum
(ALC). Each silage was offered ad libitum for 134 days, supplemented with 3 kg concentrate
per head daily. Carcass gain did not differ (P>0.05) between animals on treatments
TS-L and TS-H, but the carcass gain associated with TS-L was lower (P<0.05)
than with GS or MS-HS, and with TS-H compared with MS-HS. Carcass gain was lower
(P0.05)
among the values for MS-LS, MS-HS and MS-SU; the carcass gain associated with
ALC was the highest (P<0.001). The feed efficiency for carcass gain for the animals
on TS-L, TS-H, GS, MS-LS, MS-HS, MS-SU and ALC was 44.1, 48.2, 60.8, 59.3, 68.3,
59.8 and 90.1 (s.e. 4.26) kg/t total DM intake, respectively (P<0.001). It is concluded
that the ranking on nutritive value was TS<GS<MS<ALC. Elevating the cutting
height of triticale conferred little benefit. Half the soybean meal in the barley-based supplement to maize silage could be replaced by barley plus urea without a negative
effect on animal performance
Heterogeneous and tissue-specific regulation of effector T cell responses by IFN-gamma during Plasmodium berghei ANKA infection.
No full textIFN-γ and T cells are both required for the development of experimental cerebral malaria during Plasmodium berghei ANKA infection. Surprisingly, however, the role of IFN-γ in shaping the effector CD4(+) and CD8(+) T cell response during this infection has not been examined in detail. To address this, we have compared the effector T cell responses in wild-type and IFN-γ(-/-) mice during P. berghei ANKA infection. The expansion of splenic CD4(+) and CD8(+) T cells during P. berghei ANKA infection was unaffected by the absence of IFN-γ, but the contraction phase of the T cell response was significantly attenuated. Splenic T cell activation and effector function were essentially normal in IFN-γ(-/-) mice; however, the migration to, and accumulation of, effector CD4(+) and CD8(+) T cells in the lung, liver, and brain was altered in IFN-γ(-/-) mice. Interestingly, activation and accumulation of T cells in various nonlymphoid organs was differently affected by lack of IFN-γ, suggesting that IFN-γ influences T cell effector function to varying levels in different anatomical locations. Importantly, control of splenic T cell numbers during P. berghei ANKA infection depended on active IFN-γ-dependent environmental signals--leading to T cell apoptosis--rather than upon intrinsic alterations in T cell programming. To our knowledge, this is the first study to fully investigate the role of IFN-γ in modulating T cell function during P. berghei ANKA infection and reveals that IFN-γ is required for efficient contraction of the pool of activated T cells
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