In this work, we present a monitor and rescue system utilizing hybrid networks which is a integration of stationary sensor networks and mobile sensor networks: stationary sensor networks comprised of large numbers of ...
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ISBN:
(纸本)9781424459889
In this work, we present a monitor and rescue system utilizing hybrid networks which is a integration of stationary sensor networks and mobile sensor networks: stationary sensor networks comprised of large numbers of small, simple, and inexpensive wireless sensors, and the mobile sensor network contains a set of mobile sensors (robots). The static sensors in our network have "monitoring" ability, i.e., any activated static sensor can detect the event as long as its sensing range intersects the event region. And the mobile sensors have "moving" and "rescuing" ability, e.g., they can move toward the event region with limited speed and further perform certain rescuing/processing operations on the event. We can consider the event as a hazard, e.g., wild fire, and the mobile sensors as fireman robots. As soon as the fire is detected by the static sensors, the fireman robots are expected to move from its initial location to the hazard region within minimum latency. We define the reaction delay of the system as the delay from the occurrence of event till at least one mobile sensor reaches the event. In order to satisfy certain reaction delay requirement while minimizing the total cost, we propose a number of deployment strategies for the stationary sensor network and mobile sensor network respectively. We further design a random wake-up scheduling for the static sensors for the sake of energy efficiency. Finally, we propose a pure distributed motion strategy for mobile sensors without reliance on localization services such as GPS, focusing on simple algorithms for distributed decision making and information propagation. We demonstrate the efficacy of our system in simulation, providing empirical results. keywords-Sensor networks, mobility, detection, delay.
This paper presents an entity answer extraction method based on list web table. Firstly, extract table from page using the features of web page table and label, segment the table that includes the potential entity ans...
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The benefits of using mobile sink to prolong sensor network lifetime have been well recognized. However, few provably theoretical results remain are developed due to the complexity caused by time-dependent network top...
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ISBN:
(纸本)9781424459889
The benefits of using mobile sink to prolong sensor network lifetime have been well recognized. However, few provably theoretical results remain are developed due to the complexity caused by time-dependent network topology. In this work, we investigate the optimum routing strategy for the static sensor *** further propose a number of motion stratifies for the mobile sink(s) to gather real time data from static sensor network, with the objective to maximize the network lifetime. Specially, we consider a more realistic model where the moving speed and path for mobile sinks are constrained. Our extensive experiments show that our scheme can significantly prolong entire network lifetime and reduce delivery delay.
The network simulation (NS) is an important issue in the study of network technology. However, The error between the network performance simulation on split-object model and the true network environment is considerabl...
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The network simulation (NS) is an important issue in the study of network technology. However, The error between the network performance simulation on split-object model and the true network environment is considerable apparent. In order to obtain the NS result approaching the reality, in this paper, we analyze the structure of split-object mode and find reasons to cause the error. According to the definition of NS performance's index, we remodel the split-object model by choosing the proper function and equation in the control theory and deducing the logical coefficent in them. We further evaluate the efficiency and the availability of the new model under NS-2 platform. The results show that the new mode is more suitable for network simulation with higher accuracy.
Due to the requirements of scientific computational and data-intensive analysis, Scientific Workflow System (SWFs) technology is presented for remote resources data access and management under distributed infrastructu...
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Due to the requirements of scientific computational and data-intensive analysis, Scientific Workflow System (SWFs) technology is presented for remote resources data access and management under distributed infrastructures. The scientists are capable of using the system to address issues in their scientific domain. In this paper, firstly, we have an overview of the SWFs. Secondly, two types of scientific workflow systems are compared in the level of abstraction. And then we analyze and summarize the cross cutting issues of SWFs technology, that might be exploited in constructing workflow system effectively. We focus on the techniques, i.e., data provenance, fault tolerance and re-run. In the end, we make some suggestions towards improving SWFs.
Multi-touch technique is a novel interactive technique that supports one finger or more to manipulate simultaneously. Thus, the bimanual interaction on the touch screen has been proved as a valuable input form with hi...
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Multi-touch technique is a novel interactive technique that supports one finger or more to manipulate simultaneously. Thus, the bimanual interaction on the touch screen has been proved as a valuable input form with high degree of freedom (DOF). However, the drawbacks such as high error rate for target selection, hand fatigue and poor gesture extension critically limit the bimanual interaction on multi-touch environment. These drawbacks are mainly ascribed to the irrationality between hand input and software mapping, inconsistent gesture operation and immature gesture recognization techniques. In this paper, we investigate the related literatures about two-handed interaction techniques in multi-touch devices and discuss the drawbacks of current two-handed interaction techniques. Finally, we present some promising directions for future research.
Touch sensing devices are more intuitive and easier than traditional input devices such as mouse and other pointing devices. Bare fingers manipulate on the surface of touch sensing devices directly. However, the high ...
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Touch sensing devices are more intuitive and easier than traditional input devices such as mouse and other pointing devices. Bare fingers manipulate on the surface of touch sensing devices directly. However, the high precision target selection is difficult for the users in touch sensing device because of the visual occlusion and the limitation of “fat finger”. In this paper, we make an integral investigation on the previous literatures and survey all the possible techniques for precision target selection in touch sensing devices. Four kinds of typical techniques are discussed in detail. Finally, we propose some suggestion and discuss the future work.
There is a great demand for astronomers to process and analyze mass data which distribute all over the word through e-Science technology. Virtual observatory (VO) technology, quickly developed in recent three years, i...
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There is a great demand for astronomers to process and analyze mass data which distribute all over the word through e-Science technology. Virtual observatory (VO) technology, quickly developed in recent three years, is an effective utility to support the astronomical researches. VO consists of distributed data, component and service library and distributed services schedule. In the construction of VO, scientific workflow technique is the core component and typically used in flow customization, allocation in task and data provenance. In this study, we investigate the relational literatures and present a concise survey of existing scientific workflow technique in virtual observatory. A number of drawbacks and suggestions are made for future development of scientific workflow systems in virtual observatory.
Data sharing and distribution are critically significant in international astronomical research cooperation. In this study, based on scientific workflow technique, we further presented a batch data sharing system to s...
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Data sharing and distribution are critically significant in international astronomical research cooperation. In this study, based on scientific workflow technique, we further presented a batch data sharing system to solve the issue of batch data retrieval and sharing. The architecture and the implementation of the sharing system are presented in detail in this paper. The system fully takes advantage of the scientific workflow technique and support many useful features such as data provenance, workflow re-run mechanism and batch data presentation. The system overcomes the drawbacks of data dissemination system. A series of advantages for scientific data process such as the user can design and upload components to customize specific query tasks are discussed. According to the results of the subjective investigation, the system prototype and its application prove that the system is more suitable for astronomers in scientific data analysis.
Genetic diseases have attracted much attention to the genetic research which depends on the data named haplotypes. Because of most haplotypes are generated from genotypes, haplotype inference (HI) problem becomes very...
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