The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this study, laboratory measurement of dust removal efficiency of electrodynamic dust shield (EDS) prototypes was carried out using a real-world dust at mass loading levels relevant to solar energy applications. A removable dielectric cover method was employed to gravimetrically determine the dust removal efficiency. Three EDS prototypes with the same electrode configuration but different areas...
To shorten the networking delay from MapTracker to ReduceTracker has attractive potential to gain high performance shuffle for MapReduce. As the original MapReduce shuffle has no locality-aware feature when assigning reduce-tasks over computing nodes, we plan to present a similarity-based distance in the proposed Cloud Node Space to evaluate distance between two computing nodes in data center. Then,...
Nowadays privacy leakage related with big data spells big trouble for individuals. Generally, we provide data security and privacy protection through encrypted data but at the expense of usability. Fully homomorphic encryption allows to perform unlimited chaining of mathematical operations on encrypted data making it possible for some legal companies and institutions to use it. Compared to Gentry's...
The objective of this study was to determine the daily loss of energy output caused by dust accumulation on photovoltaic (PV) modules, to quantify the dust accumulation rate on PV panels and to determine the physicochemical properties of dust accumulated on PV panels, and their relations to soiling-induced PV performance and environmental conditions. Averaged over the one-year study period, the PV...
To cope with the increasing scale of data, GPU (Graphic Processing Unit) is integrated with more and more cores to improve processing performance. High performance, however, is at the expense of sustained power consumption. Although current GPUs support concurrent kernel execution to relieve this problem, hardware resource utilization, category of kernels and the order of concurrent kernels issued...
Energy consumption of mobile devices has become an important consideration due to the limitation of battery capacity, and OLED displays are the dominant energy consuming component of battery-operated devices. Since its energy consumption depends on the displayed content, in this work we propose a new energy-saving approach to make image more energy efficient for mobile OLED displays. The key idea...
The architecture of software systems can be naturally modeled as complex networks, where entities of software are nodes and interactions between entities are edges. These edges represent data-flows, instruction-flows and control-flows of the software, and these flows driving hardware circuit is the internal cause of the energy consumption of the software. In this research, we model software systems...
Personal data represents a post-industrial opportunity. In order to release the huge potential of personal data and enhance the rights of possession, use, and disposal, a highly reliable, secure and available infrastructure is required. Regarding the personal data market, current solutions focus on data discovery and passive privacy protection. What's worse is that the data owner loses the right of...
Though current workflow systems, known as the major task managing tool in data-center, use UNIX-based user/group authorization mechanisms to defend unauthorized operations, the information in workflow systems, such as DAG (Directed Acyclic Graph), could be easily exposed to any user-level malicious monitor. In this paper, we propose a type of side channel attack to data-center workflow information...
The growing availability of sensors integrated in smartphones provides much more opportunities for context-aware services, such as location-based and profile-based applications. Power consumption of the sensors contributes a significant part of the overall power consumption on current smartphones. Furthermore, smartphone sensors have to be activated in a stable period to match to the request frequency...
GPU can offer more powerful computing capabilities compared to that of the CPU, but the problem of the energy consumption is particularly prominent and affects its application in a broader filed. In solving this problem, DVFS (Dynamic Voltage Frequency Scaling) becomes an effective solution. The previous works use the linear approaches and ignore other component characteristics in system at software...
Saving energy is an imperative problem in the design and operation of robotic fish swarm because each fish has limited power source and cannot be conveniently replaced in aquatic environment. A novel method is proposed for energy conservation. This is to make use of cluster structure to group the fish into clusters. Therefore, it is essential to elect part of robotic fish swarm to turn into cluster...
Task assignment is one of the essential steps to enhance the cooperation of robotic fish sensor network effectively. Meanwhile, reasonable task assignment also improves the lifetime of the whole network due to the fact that robotic fish are battery-operated. Therefore, a new energy-saving task assignment method is proposed based on artificial fish swarm algorithm. First, the modeling of energy consumption...
Photovoltaic (PV) power generation performance in desert environments is affected by surface soiling due to dust deposition. In this study, PV performance, ambient dust and weather conditions were measured continuously from June 1 through December 31, 2014 at a solar test facility in Doha, Qatar. Averaged over the seven months, the PV performance loss due to soiling was 0.0042+/−0.0080 per day for...
The use of cloud computing for the better health care is more and more important. Patient's real-time physiological signals, such as electrocardiogram (ECG) and blood pressure, should be transmitted to hospital servers for remote monitoring, and stored in Data Centers (DCs) so that the authorized doctors are able to access the patient's disease history. This implies challenges in brokering between...
In this paper, we present a Robot Technology component implementation of the simultaneous path planning and topological mapping algorithm. Firstly, Simultaneous Path Planning and Topological Mapping (SP2ATM) algorithm is applied for robot path planning and environment exploration with map construction incrementally. And at the same time, Rao-Blackwellized Particle Filter (RBPF) is utilized for robot's...
Under the structure of robot technology middleware(RTM), this paper presents a distributed method for mobile robot simultaneous localization and mapping(SLAM) to address the problem of 3D modeling in complex indoor environment.We integrate the image feature and depth information to establish the correspondence-based iterative closest point (ICP) algorithm for localizing the robot precisely. With the...
With the fusion of cloud computing and virtualization technology, system security under virtualization becomes a key point in recent research. As a foundational technology to construct a secure system, virtual machine introspection receives more attention than ever. Almost all of the existing virtual machine monitors take the privileged virtual machine (Domain-0) as the monitoring machine, which ignore...
This paper examines a new measure of empirical research based on principal component analysis. We can interpret the results by employing the technique as: 2001–2010 scientific and technological competitiveness in Shanghai showing the trend of continued growth, especially in recent years maintained an accelerated increase; the main affecting factors are scientific and technological inputs and outputs...
Multi-robotic system is widely used in exploring in large-scale unknown environment and performing the complex tasks. This paper presents a method of local map merging for Multi-robotic system using RTM as communication platform. We integrate Scale-Invariant Feature Transform (SIFT) feature matching information with iterative closest point (ICP) algorithm to realize the local map merging. We use the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.