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MULTI-GRANULARITY EVOLUTION ANALYSIS OF SOFTWARE USING COMPLEX NETWORK THEORY

Journal of Systems Science & Complexity 2011年第6期24卷 1068-1082页

作者： Weifeng PAN Bing LI Yutao MA Jing LIU State Key Laboratory of Software Engineering Wuhan University Wuhan 430072 China School of Computer Science and Information Engineering Zhejiang Gongshang University Hangzhou 310018 China School of Computer Wuhan University Wuhan 430072 China Complex Networks Research Center Wuhan University Wuhan 430072 China

Software systems are a typical kind of man-made complex systems. Understanding their evolutions can lead to better software engineering practices. In this paper, the authors use complex network theory as a tool to analyze the evolution of object-oriented （OO） software from a multi-granularity perspective. First, a multi-granularity software networks model is proposed to represent the topological structures of a multi-version software system from three levels of granularity. Then, some parameters widely used in complex network theory are applied to characterize the software networks. By tracing the parameters＇ values in consecutive software systems, we have a better understanding about software evolution. A case study is conducted on an open source OO project, Azureus, as an example to illustrate our approach, and some underlying evolution characteristics are uncovered. These results provide a different dimension to our understanding of software evolutions and also are very useful for the design and development of OO software systems.

关键词： Complex networks multi-granularity software evolution software system.

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A model of security information flow on entities for trust computation

A model of security information flow on entities for trust c...

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10th IEEE International Conference on computer and Information Technology, CIT-2010, 7th IEEE International Conference on Embedded Software and Systems, ICESS-2010, 10th IEEE Int. Conf. Scalable Computing and Communications, ScalCom-2010

作者： Bahtiyar, Şerif Cihan, Murat Çaǧlayan, Mehmet Ufuk Computer Networks Research Laboratory Department of Computer Engineering Boǧaziçi University Bebek Istanbul 34342 Turkey

ISBN: (纸本)9780769541082

Service oriented environments are computer network systems that are highly dynamic and change with time. Entities in such environments have different security needs from services. Management of security information in dynamic environments with multiple entities, each with its own changing needs, is a complex task. The complexity mainly arises from a lack of trust to security information collected from entities and services. Therefore, the trust assessment about services, which is a crucial task, depends on the propagation of security information. In this paper, a new model of security information flow over entities is proposed for trust computation about services. The model is presented together with a simple scenario to clarify the proposed model. © 2010 IEEE.

关键词： Information services

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Poster abstract: Synchronous transmissions enable simple yet accurate protocol modeling

Poster abstract: Synchronous transmissions enable simple yet...

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11th ACM Conference on Embedded Networked Sensor Systems, SenSys 2013

作者： Zimmerling, Marco Ferrari, Federico Mottola, Luca Thiele, Lothar Computer Engineering and Networks Laboratory ETH Zurich Switzerland Politecnico di Milano Italy Sweden

ISBN: (纸本)9781450320276

Traditional low-power wireless protocols maintain distributed network state to cope with link dynamics. Modeling the pro- tocol operation as a function of network state is dificult as the state is frequently updated in an uncoordinated fashion. Recent protocols use synchronous transmissions (ST): mul- tiple nodes send simultaneously towards the same receiver, as opposed to pairwise link-based transmissions (LT). ST en- able eficient multi-hop protocols with little network state. We studied whether ST in Glossy enable simple yet accu- rate protocol modeling [10]. Based on extensive testbed experiments and statistical analyses, we found that: (i) unlike LT, packet receptions and losses with ST largely adhere to a sequence of independent and identically distributed (i.i.d.) Bernoulli trials;(ii) this property greatly simplifies accurately modeling ST-based protocols, as we demonstrated by obtaining model errors below 0.25% in energy for the Glossy based Low-Power Wireless Bus (LWB).

关键词： Wireless sensor networks

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SugarMate: Non-intrusive blood glucose monitoring with smartphones

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Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies 2017年第3期1卷 1–27页

作者： Gu, Weixi Zhou, Yuxun Zhou, Zimu Liu, Xi Zou, Han Zhang, Pei Spanos, Costas Zhang, Lin Tsinghua-Berkeley Shenzhen Institute Shenzhen China Electrical Engineering and Computer Sciences University of California Berkeley United States Computer Engineering and Networks Laboratory ETH Zurich Switzerland Department of Electrical and Computer Engineering Carnegie Mellon University United States

Inferring abnormal glucose events such as hyperglycemia and hypoglycemia is crucial for the health of both diabetic patients and non-diabetic people. However, regular blood glucose monitoring can be invasive and inconvenient in everyday life. We present SugarMate, a first smartphone-based blood glucose inference system as a temporary alternative to continuous blood glucose monitors (CGM) when they are uncomfortable or inconvenient to wear. In addition to the records of food, drug and insulin intake, it leverages smartphone sensors to measure physical activities and sleep quality automatically. Provided with the imbalanced and often limited measurements, a challenge of SugarMate is the inference of blood glucose levels at a fine-grained time resolution. We propose Md3RNN, an efficient learning paradigm to make full use of the available blood glucose information. Specifically, the newly designed grouped input layers, together with the adoption of a deep RNN model, offer an opportunity to build blood glucose models for the general public based on limited personal measurements from single-user and grouped-users perspectives. Evaluations on 112 users demonstrate that Md3RNN yields an average accuracy of 82.14%, significantly outperforming previous learning methods those are either shallow, generically structured, or oblivious to grouped behaviors. Also, a user study with the 112 participants shows that SugarMate is acceptable for practical usage. © 2017 ACM.

关键词： Smartphones

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An energy-efficient geographic routing based on cooperative transmission in wireless sensor networks

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Science China(Information Sciences) 2013年第7期56卷 42-51页

作者： LI Bin WANG WenJie YIN QinYe LI HongXiang YANG Rong Ministry of Education Key Laboratory for Intelligent Networks and Network Security Xi'an Jiaotong University Department of Electrical and Computer Engineering University of Louisville National Research Institute of Radio Spectrum Management

In this paper, we propose an energy-efficient cooperative geographic routing (ECGR) to reach energy-efficient routing in wireless sensor networks (WSN). ECGR takes full advantage of cooperative diversity and geographic routing. At physical layer, cooperative nodes transmit the same packet in a cooperative way to achieve farther transmission distance of each hop without more energy consumption. While at the network layer, ECGR adaptively selects the appropriate cooperative nodes to form forwarding clusters to forward the packet to the destination when we consider energy consumption and geographic information of the sensor nodes. Meanwhile, in order to fully assess the energy consumption, we take circuit energy consumption of the sensor nodes into consideration. According to the description above, we increase the transmit distance of each hop; and thereby reducing and balancing the overall network energy consumption among nodes to extend the lifetime of the network.

关键词： wireless sensor networks geographic routing transmit diversity multi-sensor diversity circuit energy consumption

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Auction-based vs. incentive-based Multiple-Cloud orchestration mechanisms

Auction-based vs. incentive-based Multiple-Cloud orchestrati...

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2012 IEEE International Conference on Communication, networks and Satellite, COMNETSAT 2012

作者： Iyer, Ganesh Neelakanta Chandrasekaran, Ramkumar Veeravalli, Bharadwaj Communications and Networks Laboratory Department of Electrical and Computer Engineering National University of Singapore Singapore Singapore

ISBN: (纸本)9781467308892

With the vast number of isolated and independent Cloud Service Providers (CSP) existing at present, it is challenging for the users to choose an appropriate CSP. In this paper, we propose two Multiple-Cloud orchestration mechanisms, one based on auction theory and the other based on incentives to address this issue. By connecting the CSPs and users through a Broker, we create a marketplace in which, the Broker maintains some information pertaining to both users and CSPs in order to help them in making appropriate decisions from time to time. Through extensive performance evaluation studies, we show the effectiveness of our schemes compared to the current Cloud environments without the Broker. Our performance evaluation studies show that our schemes enable the CSPs to offer competitive prices for same types of resources and gives flexibility for users to prioritize their requirements to choose an appropriate CSP. Further, we show that our scheme gives a fair treatment to all CSPs under certain conditions. Finally, we show that our schemes can seamlessly handle CSPs offering multiple types of resources and users having diverse requirements. © 2012 IEEE.

关键词： Computation theory

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Processor Frequency Selection for SoC Platforms for Multimedia Applications

Processor Frequency Selection for SoC Platforms for Multimed...

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25th IEEE International Real-Time Systems Symposium, RTSS 2004

作者： Liu, Yanhong Maxiaguine, Alexander Chakraborty, Samarjit Ooi, Wei Tsang Department of Computer Science National University of Singapore Singapore Computer Engineering and Networks Laboratory ETH Zürich Switzerland

ISBN: (纸本)0769522475

Of late, there has been a considerable interest in generic and configurable System-on-Chip platforms specifically targeted towards implementing multimedia applications. A number of such platforms offer the possibility of including processor soft cores which are highly customizable. For voltage/frequency scaled processors, such customization includes the selection of appropriate voltage/frequency operating points which are tuned to the application set to be mapped onto the platform. In this context, we present an analytical framework that can guide a system designer in identifying the frequency ranges that should be supported by the different processors of a platform architecture. This frame-work can also be used to identify how such frequency ranges depend on the different parameters of the architecture (such as on-chip buffer sizes), and the performance impacts associated with selecting a particular frequency range. In the case of multimedia streaming applications, identifying such performance impacts and tradeoffs involved in customizing a platform architecture is especially difficult due to the bursty nature of on-chip traffic arising out of multimedia processing and the high variability in their execution requirements. The framework presented here is designed to precisely capture such characteristics and can be used in the design-space exploration of energy-aware platform architectures for multimedia processing. © 2004 IEEE.

关键词： Multimedia systems

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Efficient caching of video content to an architecture of proxies according to a frequency-based cache management policy

Efficient caching of video content to an architecture of pro...

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2nd International Workshop on Advanced Architectures and Algorithms for Internet Delivery and Applications

作者： Satsiou, Anna Paterakis, Michael Laboratory of Information and Computer Networks Department of Electronic and Computer Engineering Technical University of Crete 73100 Chania Crete Greece

ISBN: (纸本)1595935053

This paper focuses on an environment of more than one proxy server that serve homogeneous or even heterogeneous client preferences for streaming of video files. Under a hierarchical tree topology system of proxies, the prefixes of the videos are stored in small size proxy caches each located very close to the corresponding client community, while larger caches located further away from the client communities are used to cache the latter segments of the videos requested by more than one client community. Frequency-Based Cache Management Policies are used in order to efficiently and dynamically cache the content of the most popular videos among the various proxies. Our event-driven simulations have shown that the hierarchical tree topology of proxies achieves a much higher byte-hit ratio with less cache management overhead, when using the same overall cache capacity with a simple topology of independent proxies and in general provides better performance characteristics. Copyright 2006 ACM.

关键词： Video signal processing

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The capability of bluetooth for real-time transmission in automation

The capability of bluetooth for real-time transmission in au...

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IASTED International Conference on networks and Communication Systems 2006

作者： Vedral, Andreas Wollert, Jörg F. Buda, Aurel Altrock, Robin Laboratory for Software Engineering and Computer Networks University of Applied Science Bochum 44801 Bochum Germany

ISBN: (纸本)0889865906

This examination comprises a digital analysis of the real-time capability of Bluetooth to meet the requirements of the automation field, using ACL and SCO communication channels. The bit error ratio is taken as basic characterizing indicator for the evaluation of the reliability of the communication channels. The delay time, its variation and the corresponding jitter provide a basis to review the time behaviour. Cambridge Silicon Radios (CSR) Bluetooth chips of type BlueCore 2 and BlueCore 4 were used. Several configurations with and without activation of quality of service (QoS) have been investigated regarding delay and jitter. For the basic communication channel's description and classification in terms of burst error behaviour, the well known Gilbert-Elliott model was used. Their parameters were gained by estimations using the Baum-Welch algorithm. These practical relevant parameters of the model can be used for the development and evaluation of channel codes and safety protocols within realistic simulations.

关键词： Bluetooth

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Complex field network-coded cooperation based on multi-user detection in wireless networks

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Journal of Systems engineering and Electronics 2013年第2期24卷 215-221页

作者： Jing Wang Xiangyang Liu Kaikai Chi Xiangmo Zhao School of Information Engineering Chang'an University State Key Laboratory of Integrated Service Networks Xidian University Department of Network Management Xi'an Communication College College of Computer Science and Technology Zhejiang University of Technology

Cooperative communication can achieve spatial diversity gains,and consequently combats signal fading due to multipath propagation in wireless networks powerfully.A novel complex field network-coded cooperation（CFNCC） scheme based on multi-user detection for the multiple unicast transmission is *** analysis and simulation results demonstrate that,compared with the conventional cooperation（CC） scheme and network-coded cooperation（NCC） scheme,CFNCC would obtain higher network throughput and consumes less time ***,a further investigation is made for the symbol error probability（SEP） performance of CFNCC scheme,and SEPs of CFNCC scheme are compared with those of NCC scheme in various scenarios for different signal to noise ratio（SNR） values.

关键词： network coding complex field wireless network cooperative communication multi-user detection

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