466 research outputs found
A framework for delivering multicast messages in networks with mobile hosts
No full textTo accommodate mobile hosts (MHs) within existing data networks, the static network is augmented with “mobile support stations” (MSSs) that communicate directly with MHs, usually via wireless links. Connectivity of the overall network changes dynamically as MHs connect to the static network from different “locations” (MSSs) at different times. Compared to their desktop counterparts, mobile hosts face a new set of constraints namely, low bandwidth of the wireless links, tight constraints on power consumption and a significantly lower computing capability. Thus, even without considering failures, integration of mobile computers within existing networks pose a new set of problems. In this paper, we look at the problems associated with delivering multicast messages to mobile hosts. First, we identify how a mobile host’s ability to connect to different MSSs at different times, affects delivery of multicast messages and present schemes to deliver multicast messages to MHs from atleast-one location, from atmost-one location, and from exactly-one location. Next, we introduce “multicast groups” of mobile hosts wherein each multicast group is associated with a “host view”, a set of MSSs representing the aggregate location information of the group. A host-view membership algorithm is then presented and combined with the multicast scheme for exactly-once delivery. As a result, to deliver a multicast message to a specified group, copies of the message need be propagated only to the MSSs in the group’s host-view.Technical report DCS-TR-31
MRSVP: A Reservation Protocol for an Integrated Services Packet Network with Mobile Hosts
No full textThis paper describes a reservation protocol to provide real-time services to mobile users in an Integrated Services Packet Network. The mobility of hosts has a significant impact on the quality of service provided to a real-time application. The currently proposed network system architecture and mechanisms to provide real-time services to fixed hosts are inadequate to accommodate the mobile hosts which can frequently change their point of attachments to the fixed network. Mobile hosts may experience wide variations of quality of service due to mobility. Therefore, a new real-time service architecture is necessary to accommodate mobile hosts which can tolerate variations in QoS and those which want mobility independent service guarantees in the same network. To obtain mobility independent service guarantees, a mobile host needs to make resource reservations at all locations it may visit during the lifetime of the connection. The currently proposed reservation protocol in the Internet, RSVP, is not adequate to make such reservations for mobile hosts. In this paper, we describe a new reservation protocol, MRSVP, for supporting Integrated Services in mobile networks.Technical report DCS-TR-33
Rate Adaptation Schemes in Networks with Mobile Hosts
No full textThis paper considers the problem of handoff management in an Integrated Services Packet Network supporting mobile hosts. In such a network, links may become overloaded due to a high concentration of mobile hosts within a given cell. As a result, the required Quality of Service guarantees cannot be provided to allows in that cell. However, there exist adaptive applications which can operate over a wide range of available bandwidth. Thus, it may be possible to overcome the link overload condition by reducing the bandwidth of individual rows, which we call rate adaptation. The two most important properties of a rate adaptation scheme are its network overhead and its fairness property. Rate adaptation schemes which ensure certain fairness properties, such as maxmining optimality criteria, have very high network overhead. Therefore, these schemes are not suitable for a highly mobile environment where rate adaptation may have to be invoked frequently. In this paper, we investigate the tradeoff between the network overhead and the fairness property of rate adaptation in a mobile environment. We first characterize the fairness property of rate adaptation by several measurable parameters. We then describe two rate adaptation schemes, one of which has very low network overhead but is `unfair', while the other scheme is `fair' but has a very high network overhead. Finally, we propose a new rate adaptation scheme which reconciles the two conflicting properties. Results of simulation experiments comparing the performances of the three rate adaptation schemes are presented.Technical report DCS-TR-35
Admission control algorithms and reservation protocol for supporting mobile hosts in an Integrated Services Packet Network
No full textThis paper considers the support of real-time applications to mobile hosts in an Integrated Services Packet Network. We have proposed a service model for mobile hosts that can support adaptive applications which can withstand wide range of available bandwidth, as well as applications which require mobility independent service guarantees. We describe an admission control scheme and a reservation protocol for implementing this service model. Our admission control scheme achieves high utilization of network resources.Technical report lcsr-tr-28
DATAMAN project: Towards a Mosaic-like Location-Dependant Information Service for Mobile Clients
No full textThe goal of the DATAMAN project is to develop primitives and build and environment for location-dependant applications. In such applications, information requested by the user depends on the location from which it is accessed, and which may be invalidated or continue to be valid when a user changes location. This paper conceptually describes the main primitives and a preliminary implementation of an intelligent building demonstrating the use of some of these primitives.Technical report DCS-TR-32
IP multicast extensions for mobile internetworking
No full textThis paper deals with multicasting in an internetwork with mobile hosts, particularly with regard to Mobile-IP and Distance Vector Multicast Routing (DVMRP) protocols. When the source of a multicast datagram is a mobile host (MH), the datagram may not reach all group members to which the datagram is addressed, including other mobile hosts. When the source is a static host and the multicast group includes mobile hosts, a mobile group member may receive datagrams in one cell but not in another. Further, when a MH enters a cell which contains no other member of the same group, the MH will experience a delay before it starts receiving datagrams addressed to that group. Mobility between campuses, which result in a MH acquiring an additional unicast address, also has an effect on multicast routing. We propose enhancements to DVMRP executed at the Mobility Support Routers (MSR) that ensure correct forwarding of multicast datagrams to and from mobile hosts. Our solutions do not require any change at hosts and routers unaware of mobility, i.e. the modifications are limited to MSRs and MHs. We also describe an implementation incorporating a subset of our proposals. Lastly, we show that alternate styles of multicasting or mobile networking, viz. link-state (MOSPF ) and IETF proposal, will face similar problems and our proposed solutions are still valid in their context.Technical report lcsr-tr-24
Distribution-Free Tests for Two-Sample Location Problems Based on Subsamples
No full textNonparametric tests for location problems have received much attention in the literature.
Many nonparametric tests have been proposed for one, two and several samples location problems. In
this paper a class of test statistics is proposed for two sample location problem when the underlying
distributions of the samples are symmetric. The class of test statistics proposed is linear combination
of U-statistics whose kernel is based on subsamples extrema. The members of the new class are
shown to be asymptotically normal. The performance of the proposed class of tests is evaluated using
Pitman Asymptotic Relative Efficiency. It is observed that the members of the proposed class of tests
are better than the existing tests in the literature
Mysticism in Indian English Poetry (Sri Aurobindo, Puran Singh, Sri Ananda Acharya, Krishnamurti, India)
No full textDefining mysticism as the quest for, and the attainment of, complete self-realization, this dissertation examines the work of four major and nine minor Indian English mystical poets. The study devotes a chapter each to mysticism in the poetry of Sri Ananda Acharya, Jiddu Krishnamurti, Puran Singh, and two chapters to Sri Aurobindo, the former on his mystical poetry, except Savitri, and the latter on the epic. A long chapter examines the minor mystical poets, Swami Rama Tirtha, Swami Paramananda, Paramahansa Yogananda, Swami Vivekenanda, Swami Sivananda, Mohan Singh, Nissim Ezekiel, Girdhari Tikku, and Syed Amanuddin.In the chapters on the major poets, each poet's mysticism is considered as a unity with a four-fold division consisting of the mystical experience itself, other goals besides the mystical experience, the way to these goals, and the incentives to spiritual life. These chapters also contain a biographical sketch of the author, and a description of his major works. In the case of the minor mystical poets, little biographical and bibliographical detail is provided, and the focus is primarily on the mystical experience. The introduction offers a historical perspective on mysticsm in Indian English poetry, explains the key terms and the methodology used, and clarifies the bases for the selection of the chosen poets. The conclusion outlines the common features of the mystical experience in these poets, which include dissolution or disintegration of the ego or the limited self; union with the Absolute, whether known as the Beloved, God, Guru, or Truth; a transformation and expansion of consciousness; an experience of ineffable joy and bliss; and the ending of suffering, confusion, and doubt. It also synthesized a universe in which these poets function by comparing the major patterns of imagery used by them. The Appendix is a partially annotated bibliography of Indian English religious poetry. To sum up, this is an exploratory and descriptive study, highlighting an area that has hitherto received little attention.Made available in DSpace on 2014-12-15T19:15:15Z (GMT). No. of bitstreams: 1
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Previous issue date: 1985Embargo set by: Seth Robbins for item 69610
Lift date: Forever
Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDsRestricted to the U of I community idenfinitely during batch ingest of legacy ETDsU of I Only359 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1985
India’s Macroeconomic Performance and Policies since 2000
No full textThe paper reviews Indias macroeconomic performance and policies since 2000. The first section briefly summarizes key macroeconomic developments regarding economic growth, inflation, external balance, the fiscal situation and aggregate savings and investment. The second section considers some of the challenges posed to macroeconomic management in this period and the efficacy of the policy responses adopted. In particular, it analyses the progress in fiscal consolidation and the policies adopted to deal with the challenge of the unprecedented surge in external capital inflows into India. The final section outlines some of the major macro policy issues that need to be addressed in the years ahead, including : the resurgence of high fiscal deficits; the issues relating to external convertibility and exchange rate management; the role of the Reserve Bank of India in macroeconomic policy and coping with a weak international economic environment.economic growth, inflation, Fiscal Policy, savings and investment, Capital Inflows, exchange rate policy, central bank role
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