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Remote sensing applications in Digital Earth are overwhelmed with vast quantities of remote sensing (RS) image data. The intolerable I/O burden introduced by the massive amounts of RS data and the irregular RS data access patterns has made the traditional cluster based parallel I/O systems no longer applicable. We propose a RS data object-based parallel file system for remote sensing applications...
Interoperability testing is to confirm that two or more Implementation under Test (IUTs) are able to correctly communicate or interoperate. Passive method does not disturb the components' normal operation and works over real network environment. In order to improve efficiency of testing in special network environment, this paper presents a generic and systematic development process for automated passive...
In this paper, we propose a platform named EmuCloud, aiming to provide a test environment for SDN with high fidelity and low cost. EmuCloud is based on IaaS cloud, and the key idea of the platform is to extend the abstract networking resources to provide virtual openflow switch, and combine this new abstraction with existing service (such as computing, storage, authentication, etc.) seamlessly. Compared...
This paper explores the opportunity for energy cost saving in data centers that utilizes the flexibility from the Service Level Agreements (SLAs) and proposes a novel approach for capacity provisioning under bounded latency requirements of the workload. We investigate how many servers to keep active and how much workload to delay for energy saving while meeting latency constraints. We present an offline...
Along with the rapid development of peer-to-peer network technology and the fast increasing number of users, the problems of security in peer-to-peer network is becoming more and more important. By researching the previous trust model of peer-to-peer network, we propose a trust model(PTM) for peer-to-peer networks based on punish mechanism. Firstly, we use the method of social grouping nodes in the...
SQL Injection (SQLI) is an attack method that is easy to achieve but often leads data leak and malicious control of the system, so anti SQLI is very important for applications using database. This paper proposes an algorithm for detecting SQLI based on statements sequence digest (SSD). Abstract SQL statement, SSD and its calculating method are defined; algorithms for building SSD and detection SQLI...
Workflow Engine is the core component of Workflow Management System. According to the standards of Workflow Management Coalition, this paper uses Petri net as the principle model, divides the Engine system into five functional modules,adopts Java EE Distribute Object Computing technique,thread poll control mechanism and BeanShell script interpreter technique to give the design and implementation solution...
Presence service has become one of the key application services, which can be applied in many areas, such as buddy status, tele-working, ticket sale, the Internet of things, location-based service and so on. And cloud computing, widely used to provide a variety of IT services, has been a new method of sharing infrastructure. This paper presents a design and implementation of presence service deployed...
A bedside card is generally used for showing an inpatient's information in the ward. However a bedside card may reveal an inpatient's private information. In this paper, we propose a prototype to replace the paper bedside card. The electronic bedside card is shown on a digital TV screen, once triggered by the medical staffs using a RFID tag/card. The idea comes from that not every ward has a computer...
One difficulty in distance teaching is how to determine static and dynamic abilities of student, which teaching strategies can be adjusted according to individual differences and learning effect can be improved. This paper proposes a structured student learning model. Teaching system can teach students according to their aptitude based on this model. The distance teaching adaptability can be achieved...
One of the important issues in the design of future generation high-speed networks is to provide differentiated services to different types of traffic with/without various time constraints and priorities. In this paper, we study the problem of providing differentiated services in passive star coupled wavelength division multiplexing (WDM) optical networks. We suggest a simple static priority based...
With the rapid development of network scale, the current SNMP network management model has not been able to meet requirements. Therefore, a new kind of management system and strategy must be provided to enhance the reliability and performance of the network management. This article discusses problems existed in traditional network and analyses the management system structure and management mechanism...
This paper analyzes grid resources organization, elaborates on the fundamental principles of the ant colony algorithm, and proposes a grid resource discovery method based on the ant colony algorithm. We consider users request ontology as ants, take search resource as food, and food source is the node of search target. The process of ants to find food is similar to the process of discovery grid resources.
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