Volume1,
Number4, 2000
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Title: |
A System Model for Mobile and
Wireless Networking |
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Author: |
N. Pissinou, M. Hossain and K. Makki |
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Abstract: |
In providing mobile/wireless users with information services to their satisfaction, the supporting software in both Mobile Support Station (MSS) and Mobile Unite (MU) should be designed in such a way that ensures minimum involvement between a mobile user and the MSS without degrading service quality. Applications designed for mobile clients must take into account various network conditions such as available bandwidth, computing resources such as battery power, memory and CPU capability. Some common framework can be designed to take care of all these constraints and relieve the individual applications of this burden. In this paper, we propose a system model that takes care of network conditions, caches data in persistent storage on users’ behalf and processes users’ requests, all in one user-support-application. |
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Title: |
Traffic Shaping for QoS Control
in MPEG Video Transmission over Integrated Services |
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Author: |
M. F. Alam, M. Atiquzzaman and M. A. Karim
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Abstract: |
The Internet Engineering Task
Force (IETF) has proposed the Integrated Services model for providing Quality
of Service (QoS) guarantees to real-time applications like variable-bit-rate
video and multimedia. Before starting a session over the Integrated Services,
resources need to be reserved from the network for supporting the data flow.
The resource reservation process depends on the characteristics of the traffic
to be generated by the end application as well as the level of QoS guarantee
required by the end application from the network. Once a flow is set up, it is
required that there is a traffic shaping mechanism so that the traffic
generated by the application conforms to the prenegotiated traffic
specification. Although the token bucket (with leaky bucket peak rate
control) algorithm can be used for traffic shaping in the Integrated
Services, a simpler approach for traffic shaping is desired for increased
efficiency. We propose a simple and efficient traffic shaper that is much
easier to implement than a token bucket traffic shaper, and works coherently
with token bucket traffic policing elements in an Integrated Services
network. We develop an analytical model of the proposed shaper and carry out
numerical simulation of the shaper performance using MPEG trace data from
several different movie clips. The numerical simulation results are in
excellent agreement with the analytical model. For different types of MPEG
video sequences, effects of the proposed traffic shaper parameters on delay
and buffer requirement are studied. Our study also provides a straightforward
method of determining the traffic specification (TSpec) parameters that have
to be specified while setting up a flow in an Integrated Services network
from QoS parameters. |
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Title: |
On Mobile Internet Telephony:
Mobility Support of Signal Initiation Protocol (SIP) |
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Author: |
Melody Moh, Gregorie Berquin and Yanjun Chen
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Abstract: |
The Internet has recently become
the most important, popular way of communication. A significant new feature
of Internet is the support of telephony. Two main competing signaling
protocol standards have been developed for this purpose: H.323, proposed by
the ITU, and SIP (Signal Initiation Protocol), proposed by the IETF. Another
new feature for the Internet is the support of terminal mobility. The IETF
efforts in this field have resulted in the Mobile IP standard. Recently, Liao
has shown that Mobile IP doesn’t provide fast enough handoffs to support
voice communications. Liao has also demonstrated how H.323 may be extended to
offer a solution. In this paper we address several major issues for
supporting mobility on SIP. We detail the mechanisms for extending SIP to
support location management, registration of roaming mobiles, and handoffs.
The mechanisms are either simple extensions of existing SIP, or based on
Mobile IP, and thus may be readily employed over the Internet. We believe
that the work presented here is an important step towards supporting mobile
telephony over the Internet. |
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Title: |
PIONets: Polyhedral
Interconnection of Optical Networks |
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Author: |
Sam Makki, N. Pissinou and Ashwin Gumaste |
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Abstract: |
Multihop lightwave networks[1]
form the backbone of most metropolitan area networks employing WDM. Shufflenet[2],
De bruijn graph and TIONets[3] are examples of such multihop networks. We put
forth another multihop network intended for metropolitan area networks using
packet switching and store and forward schemes for routing. This new structure
named PIONet or Polyhedral interconnection of Optical Networks is a unique
case study for issues of scalability and fault tolerance. In this paper we
also examine the ability of this network to grow as well as the high degree
of fault tolerance it possess. |
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Title: |
TCP over IEEE 1394 Home Networks |
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Author: |
Chiewon Lee, Jongwook Jang and E.K. Park |
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Abstract: |
TCP typically offers reasonable
end-to-end performance to users regardless of the bandwidth and error
characteristics of particular network technology. The robustness of TCP has
contributed to its success in the internet environment. The role of
communications is already well established in the office environment. With
the advent of cheap, affordable broadband communications and the increasing complexity
of consumer goods, it seems natural to extend the network into homes. In-home
networking means a high-speed communication among the digital appliances
within a home. Introduction of application over high-speed home network using
TCP/IP protocol is increasing. The integrated environment of internet and
home network is demanding as well. We have validated TCP model over
high-speed home network environment, investigated the throughput behavior of
TCP over IEEE 1394 home networks, and evaluated a potential solution for high
performance of TCP over IEEE 1394 home networks. The simulation model has
produced several interesting results in the performance of TCP over IEEE 1394
home network. |
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Title: |
The Self-Correction Method For
Programming Language Tutoring System |
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Author: |
Nammee Moon |
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Abstract: |
In this study, We suggest an
effective program self-correction method which can be applied to variety of
languages. Rather then a number of plans lists in static analysis, a certain
program frame is used for planning. That is, a standard program frame given
by inputs creates some rules that can recognize novice’s programs. The static
analysis is executed by a comparison between a expert program and a student
program. The dynamic analysis that suggested in this research has limited
analysis coverage in order to draw a solution for the data storage problem.
That is, we suggest the method to solve the problem the information derived
from the static analysis and by narrowing down analysis boundary. The
analysis of the outputs by the dynamic approach is made by using the temporal
vector that has recorded the match information of the symbol and timely
movement of the variable. This paper presents a design and implementation of
PROgramming Language Tutoring System which is named as PROLTUS. |
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