![MS Dissertation and Project Defenses](https://newsroom.unl.edu/announce/files/file21999.jpg)
"A WLAN Fingerprinting Based Indoor Localization Technique"
Landu Jiang
Thursday, July 12, 2012 at 9 a.m.
211 Schorr Center
Satellite-based Global Positioning Systems (GPS) has enabled a variety of location-based services such as navigation systems, and become increasingly popular and important in our everyday life. However, GPS does not work well in indoor environments where walls, floors and other construction objects greatly attenuate satellite signals.
In this paper, we propose an Indoor Positioning System (IPS) based on widely deployed indoor WiFi systems. Our system uses not only the Received Signal Strength (RSS) values measured at the current location but also the previous location information to determine the current location of a mobile user. We have conducted a large number of experiments in the Schorr Center of the University of Nebraska-Lincoln, and our experiment results show that our proposed system outperforms all other WiFi-based RSS IPSs in the comparison, and is 5% more accurate on average than others.
"Routing Over the Interplanetary Internet"
Joyeeta Mukherjee
Friday, July 13, 2012 at 1 p.m.
211 Schorr Center
Future space exploration demands a Space Network that will be able to connect spacecrafts with one another and in turn with Earths’ terrestrial Internet and hence efficiently transfer data back and forth. The feasibility of this technology would enable common people to directly access telemetric data from distant planets and satellites. The concept of an Interplanetary Internet (IPN) is only in its incubation stage and considerable amount of common standards and research is required before widespread deployment can occur to make the IPN feasible.
We provide a comprehensive survey that presents a picture of the current space networking technologies and architectures. In the survey we discuss the IPN and Delay Tolerant Networking (DTN) concepts along with the various space networks that are currently deployed. We next propose a design of the IPN and implement it with the Interplanetary Overlay Network (ION) software module on real time physical nodes on the ORBIT testbed. Two space network scenarios are designed and experimentally evaluated to verify the correctness of the network implementation. We also focus on the study of bundle transmission delay and separately evaluate the effect of bundle size and number of bundles. The experimental evaluation provides an insight into the factors which caused delay in bundle transmission such as custody refusal, expiration of bundle lifetime and congestion.
"Dynamic Network Traffic Isolation Through OpenFlow"
Anisha Kolasani
Monday, July 16, 2012 at 11 a.m.
256C Avery Hall
OpenFlow is the latest and most widely accepted networking technology which is used to realize the paradigm changing concept of Software Defined Networking (SDN). OpenFlow strongly advocates the separation of a switch's control plane from the data plane and a centralized controller to control the entire network.
Traffic isolation enables greater security for network communication, along with managing the bandwidth of the network more efficiently and providing logical separation between hosts that need to work together. But, dynamically managing the traffic isolation in a network is a very tedious task. Network management applications using OpenFlow for addressing this problem are not widely available. We propose two approaches to solve this problem using OpenFlow.
We developed two OpenFlow controller applications 'OFModifyVLAN' and 'OFWhiteListing,' for addressing the above problem in short-term and long-term dynamic scenarios, respectively. We configured multiple OpenFlow network platforms using Mininet, Open VSwitch and HP Procurve switch to test the working and performance of the two OpenFlow controller applications. We tested 'OFModifyVLAN' on the Open VSwitch network, while 'OFWhiteListing' has been tested on all three platforms. We measured the round trip time of the packets in all the above mentioned scenarios. By observing the experimental results, we conclude that the two applications are capable of handling traffic isolation in real networks. Further, we conclude that 'OFWhiteListing' is more efficient than 'OFModifyVLAN.'