Hawaii International Conference on System Sciences

In this paper, we present a novel packet delivery mechanism called Multi-Path and Multi-SPEED Routing Protocol (MMSPEED) for probabilistic QoS guarantee in wireless sensor networks. The QoS provisioning is performed in two quality domains, namely, timeliness and reliability. Multiple QoS levels are provided in the timeliness domain by guaranteeing multiple packet delivery speed options. In the reliability domain, various reliability requirements are supported by probabilistic multipath forwarding. These mechanisms for QoS provisioning are realized in a localized way without global network information by employing localized geographic packet forwarding augmented with dynamic compensation, which compensates for local decision inaccuracies as a packet travels towards its destination. This way, MMSPEED can guarantee end-to-end requirements in a localized way, which is desirable for scalability and adaptability to large scale dynamic sensor networks. Simulation results show that MMSPEED provides QoS differentiation in both reliability and timeliness domains and, as a result, significantly improves the effective capacity of a sensor network in terms of number of flows that meet both reliability and timeliness requirements up to 50 percent (12 flows versus 18 flows).

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MMSPEED: multipath Multi-SPEED protocol for QoS guarantee of reliability and. Timeliness in wireless sensor networks

The concept of energy-efficient networking has begun to spread in the past few years, gaining increasing popularity. Besides the widespread sensitivity to ecological issues, such interest also stems from economic needs, since both energy costs and electrical requirements of telcos' and Internet Service Providers' infrastructures around the world show a continuously growing trend. In this respect, a common opinion among networking researchers is that the sole introduction of low consumption silicon technologies may not be enough to effectively curb energy requirements. Thus, for disruptively boosting the network energy efficiency, these hardware enhancements must be integrated with ad-hoc mechanisms that explicitly manage energy saving, by exploiting network-specific features. This paper aims at providing a twofold contribution to green networking. At first, we explore current perspectives in power consumption for next generation networks. Secondly, we provide a detailed survey on emerging technologies, projects, and work-in-progress standards, which can be adopted in networks and related infrastructures in order to reduce their carbon footprint. The considered approaches range from energy saving techniques for networked hosts, to technologies and mechanisms for designing next-generation and energy-aware networks and networking equipment.

Energy Efficiency in the Future Internet: A Survey of Existing Approaches and Trends in Energy-Aware Fixed Network Infrastructures

Space-air-ground integrated network (SAGIN), as an integration of satellite systems, aerial networks, and terrestrial communications, has been becoming an emerging architecture and attracted intensive research interest during the past years. Besides bringing significant benefits for various practical services and applications, SAGIN is also facing many unprecedented challenges due to its specific characteristics, such as heterogeneity, self-organization, and time-variability. Compared to traditional ground or satellite networks, SAGIN is affected by the limited and unbalanced network resources in all three network segments, so that it is difficult to obtain the best performances for traffic delivery. Therefore, the system integration, protocol optimization, resource management, and allocation in SAGIN is of great significance. To the best of our knowledge, we are the first to present the state-of-the-art of the SAGIN since existing survey papers focused on either only one single network segment in space or air, or the integration of space-ground, neglecting the integration of all the three network segments. In light of this, we present in this paper a comprehensive review of recent research works concerning SAGIN from network design and resource allocation to performance analysis and optimization. After discussing several existing network architectures, we also point out some technology challenges and future directions.

Space-Air-Ground Integrated Network: A Survey

The present system includes a computer-networked system that allows mobile subscribers, and others, to submit mobile applications to be analyzed for anomalous and malicious behavior using data acquired during the execution of the application within a highly instrumented and controlled environment for which the analysis relies on per-execution as well as comparative aggregate data across many such executions from one or more subscribers.

Automated behavioral and static analysis using an instrumented sandbox and machine learning classification for mobile security

The Department of Electrical and Computer Engineering (AFIT/ENG) at the Air Force Institute of Technology (AFIT), currently offers a graduate-level introductory course in digital forensics. Students are introduced and exposed to several challenges and topics in the digital forensics course. The course addresses the ethical and legal procedures as well as basic forensic science principles in only the most general manner. A larger percentage of lecture and lab time is spent discussing the technical details of incident response and media analysis. The detail into the network forensics and digital device analysis topics start to breach technical details but not to the level of attempting mastery. This course provides our students with real world digital forensics experience to prepare them for the challenges they may face in postgraduate employment

Graduate Digital Forensics Education at the Air Force Institute of Technology

Low earth orbit satellite-based multicasting technologies are well-suited for secure group communications in a widely distributed, highly mobile environment. We present a novel modular multicasting architecture designed to increase system scalability for secure operations in a low earth orbiting satellite system. Simulation results demonstrate superior per-user average re-keying performance over baseline and clusterized architectures in various modeled scenarios. In scenarios with highly mobile users, the architecture achieved a nine-fold reduction in average user re-keying.

A secure and efficient satellite-based multicast architecture

This paper describes an empirical evaluation of the ability of an IEEE 802.11g network to transport audio and video as well as compare audio quality in the presence and absence of an access point within an office environment using standard off-the-shelf hardware and default device configurations. The impact of securing the audio stream with WPA (WiFi Protected Access) on the perceived quality is also examined. Following the ITU-T P.800 recommendation, thirty-six human subjects assess audio and video quality using a Mean Opinion Score (MOS) on a wireless multimedia system. Experimental data suggest that securing the voice traffic has no significant effect on the quality of the audio signal received. Furthermore, an 18.4% improvement in the perceived quality of the audio signal can be achieved by routing the audio and video traffic through an access point instead of allowing the audio and video traffic to flow directly between two arbitrary nodes within a wireless local area network. Furthermore, increasing the number of conversations reduces the perceived quality of the audio signal by 23.5% and the video signal by 16.8%. Disabling video increases the perceived audio quality by 38.9%. This paper shows that the usable capacity, based on signal quality, of a standard IEEE 802.11g wireless multimedia system deployed in an office environment is two audio-only conversations or one audio/one video connection on the wireless network.

Voice and video capacity of a secure IEEE 802.11g wireless network

The Air Force Institute of Technology competed for the first time in the all-service cyber defense exercise this year To do so required a restructuring of the existing specialty track in information systems security/assurance, in order to align with the exercise schedule and maintain an appropriate graduate level emphasis In addition, the school was able to enroll, for the first time ever, senior enlisted members of the Air Force and Marine Corps who contributed a wealth of tactical, practical, knowledge and experience in deploying information systems under less than ideal conditions The merits of these factors were borne out by the school's success on its maiden effort

Integrating CDX into the graduate program

Military communications require the rapid deployment of mobile high-bandwidth systems. This work characterizes the electromagnetic interference (EMI) effects of ultra wideband (UWB) transmissions on an IEEE 802.11a ad-hoc network throughput performance. Radiated measurements in an anechoic chamber investigate interference performance for three binary modulation schemes including bi-phase shift keying (BPSK), pulse position modulation (PPM), and on-off keying (OOK) and four pulse repetition frequencies (PRF) transmitted over two unlicensed national information infrastructure (U-NII) channels. Results indicate that OOK and BPPM can degrade throughput performance by up to twenty percent at lower PRF and lower U-NII channels. Minimal performance degradation (less than one percent) due to interference is observed for BPSK at the lower PRF and higher U-NII channels.

Richard A. Raines

Papers

Graduate Digital Forensics Education at the Air Force Institute of Technology

A secure and efficient satellite-based multicast architecture

Voice and video capacity of a secure IEEE 802.11g wireless network

Integrating CDX into the graduate program

An empirical study of electromagnetic interference caused by ultra wideband transmissions in an IEEE 802.11a wireless local area network