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Software change histories are results of incremental updates made by developers. As a side-effect of the software development process, version history is a surprisingly useful source of information for understanding, maintaining and reusing software. However, traditional commit-based sequential organization of version histories lacks semantic structure and thus are insufficient for many development...
Today, due to the popularity and convenience of wireless communications, people communicate with others by using mobile phones almost every day, as one of their important daily activities. Currently, LTE-4G is the mainstream of mobile communication. Recent studies on the upcoming LTE-5G wireless environments employ AES to protect delivered messages. However, using this cryptography standard to encrypt/decrypt...
Semantic history slicing solves the problem of extracting changes related to a particular high-level functionality from the software version histories. State-of-the-art techniques combine static program analysis and dynamic execution tracing to infer an over-approximated set of changes that can preserve the functional behaviors captured by a test suite. However, due to the conservative nature of such...
To allow mobile devices to conserve energy, IEEE 802.11 standard specifies a power save mode (PSM). A station in PSM, i.e. a PSM-STA, will wake up at a predefined listen interval (LI) to receive frames buffered at the access point (AP) while it is sleeping. When a PSM-STA wakes up to receive a beacon and finds that there are no buffered frames, the PSM-STA experiences an unnecessary wakeup. In case...
This paper studies the fundamental problems of mining association rules. Based on the summary of classical mining algorithm and the inherent defects of Apriori algorithm, some related improvements are researched. In order to avoid scanning the database multiple times, the database mapping method is changed in this research. Meanwhile, after the support of candidate item sets is get, each candidate...
To reduce energy waste in future cellular networks, the most effective and reliable method is to close idle base stations when not needed, but how to find the proper and optimal method to control the target cell and the adjacent ones are still blank according to recent researches. In this work, we extend our research in cooperative scheme, and figure out a heuristic control method of eNodeBs in GREEN...
Study on energy consumption in wireless systems becomes attractive recently. The worldwide organization 3GPP has established a series of standards to help reduce energy consumption in wireless systems. However, the utilization of green related techniques is still in theoretical way. To reduce energy consumption in cellular networks, the effective and common method is to shut down idle base stations...
The fusion of artificial fish algorithm and genetic algorithm is proposed to optimize the flight scheduling of two-runway in large airport in which the problems are difficult, inefficient and serious flight delays. First, in this paper, the shortcomings of artificial fish algorithm and genetic algorithm are analyzed, and combing the advantages of two algorithms, optimization algorithm is proposed...
In this work, we address the Routing and Time slot Assignment (R&TA) problem in multi-hop PLC access networks. In our system, time is divided into fixed sized TDM cycles. Each cycle comprises a semi-dynamic bandwidth allocation period (SBAP) and a dynamic bandwidth allocation period (DBAP). The SBAP is used to provide each PLC CPE fixed bandwidth for providing bandwidth guaranteed services. It's...
The algorithm of the dynamic range control (DRC) was applied in the research of the audio directional system. According to the feature of audio directional system, the implementation of the static curve was modified, and the model of DRC based on simulink was built. The calculation results demonstrate that DRC is an effective optimal method to enhance the main sound and reduce the noise in the audio...
As a failure occurs, the affected traffic is quickly switched to backup paths for a network performing a fast IP rerouting. However, the rerouted traffic may cause congestion along the backup paths that would result in more packet losses than purely discarded the affected flows. In this paper, we take the concept of interface specific forwarding (ISF) to provide more flexibility in determining load...
With the rapid progress of 3GPP LTE/LTE-A's standardization, research about coordinate multi point reception / transmission (CoMP) is very popular. However, topics about CoMP were freezed in around 2009 by 3GPP, so further research and performance analysis about key techniques in CoMP is very little. In this paper, we studied the dynamic cell selection method which is presented in some proposals [1],...
Resource allocation problem in cognitive radio networks (CRN) is one of the key issues to improve the efficiency of spectrum utilization. Most of previous work on resource allocation mainly concentrates on the secondary users (SUs) with only one type of service requirement, without considering the scenario with heterogenous services requirement. In this paper, we study the dynamic channel and power...
Multiple supply voltage is a prevalent and effective technique to balance power and performance. A multiple supply voltage design is divided into voltage islands at physical design, where each island occupies a contiguous physical region and operates at some supply voltage. Given a set of blocks and the timing-safe voltage levels for each block, we simultaneously generate a floorplan and form the...
Traveling-schedule (TS) arrangement is a classical ill-define problem which lacks of structure and fulfills uncertainty and dynamic complexity. In general, there are two ways to resolve TS arrangement (TSA) problem, including: package tourism provide by travel agency who arrange entire traveling program. The other is independent tourism that travelers should collect information and arrange all traveling-detail...
In order to predict the dynamic surface subsidence and deformation, a working face was divided into some mining elements along strike according to the face advancing, and the dynamic surface subsidence and deformation was regard as the superposition of the dynamic subsidence and deformation independently of all these mining elements. There might be a section of which width was shorter than a mining...
Negotiation strategy is an important research branch of agent-based automatic negotiation. Under the background of bilateral multi-issues negotiation, a novel negotiation skill algorithm by interactive micro-adjustment and multi-rounds approximation is proposed, which classifies both partiespsila proposal issues into two divisions --- interest point set and disinterest point set, and combined with...
We present a novel approach for real-time motion planning of multiple formations in virtual environments with dynamic obstacles. Our algorithm is based on the continuum model for crowd simulation and our flexible virtual structure approach for formation control in virtual environments. Simulations created with our algorithm run at interactive rates in quite complex environments. In addition, each...
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