In order to solve the problems of poor stability and multiple mismatching points in image registration, most scholars have used Random Sample Consensus (RANSAC) algorithm to optimize the matching algorithm. However, because of the randomness of the RANSAC algorithm itself, the matching algorithm has poor stability, low registration efficiency and poor robustness. To solve this problem, an improved SIFT (Scale-invariant feature transform) image registration optimization algorithm based on PROSAC (Progressive Sampling Consensus) was proposed. The experimental results showed that the proposed image registration optimization algorithm could effectively solve the problems of error matching and low efficiency in the process of image matching. Using the same image to test, the average correct registration rate of the traditional RANSAC improved SIFT algorithm was 82%, and the average running time was 36 seconds. The average correct registration rate of the SIFT image registration algorithm based on PROSAC improved SIFT image registration algorithm was 86.67%, the average running time was 26.51 seconds, and the running efficiency was increased by 36%. Therefore, the improved SIFT image registration algorithm based on PROSAC has higher robustness, can meet the needs of fast image mosaic, and has broad application prospects.In order to solve the problems of poor stability and multiple mismatching points in image registration, most scholars have used Random Sample Consensus (RANSAC) algorithm to optimize the matching algorithm. However, because of the randomness of the RANSAC algorithm itself, the matching algorithm has poor stability, low registration efficiency and poor robustness. To solve this problem, an improved SIFT (Scale-invariant feature transform) image registration optimization algorithm based on PROSAC (Progressive Sampling Consensus) was proposed. The experimental results showed that the proposed image registration optimization algorithm could effectively solve the problems of error matching and low efficiency in the process of image matching. Using the same image to test, the average correct registration rate of the traditional RANSAC improved SIFT algorithm was 82%, and the average running time was 36 seconds. The average correct registration rate of the SIFT image registration algorithm based on PROSAC improved SIFT image registration algorithm was 86.67%, the average running time was 26.51 seconds, and the running efficiency was increased by 36%. Therefore, the improved SIFT image registration algorithm based on PROSAC has higher robustness, can meet the needs of fast image mosaic, and has broad application prospects.
GRID technology provides a kind of convenient method for managing GRID resources. This service is so-called monitoring, discovering service. This method is proposed by Globus Alliance, in this GRID environment, all kinds of resources, such as computational resources, storage resources and other resources can be organized by MDS
specifications. However, this MDS is a theory framework, particularly, in a small world intranet, in the case of limit of
resources, the MDS has its own limitation. Based on MDS, an improved light method for managing corporation computational resources and storage resources is proposed in intranet(IMDS). Firstly, in MDS, all kinds of resource description information is stored in LDAP, it is well known although LDAP is a light directory access protocol, in
practice, programmers rarely master how to access and store resource information into LDAP store, in such way, it limits MDS to be used. So, in intranet, these resources' description information can be stored in RDBMS, programmers and users can access this information by standard SQL. Secondly, in MDS, how to monitor all kinds of resources in GRID is not transparent for programmers and users. In such way, it limits its application scope, in general, resource monitoring method base on SNMP is widely employed in intranet, therefore, a kind of resource monitoring method based on SNMP is integrated into MDS. Finally, all kinds of resources in the intranet can be described by XML, and all kinds of resources' description information is stored in RDBMS, such as MySql, and retrieved by standard SQL, dynamic information for all kinds of resources can be sent to resource storage by SNMP, A prototype resource description, monitoring is designed and implemented in intranet.
Internet only provides users with best effort services, today, with the development of next generation Internet, next generation Internet will provides users with tremendous services, how to manage these tremendous services and provides users with differentiated services automatically, must be solved for service providers and network providers. A two planes’ service management architecture is proposed, the one is application service management based on application plane, and the other is transport service management based on transport plane. In this paper, mapping application service into transport service and issues for QoS are studied, primarily. It is well known that different application services correspond to different QoS requirement during they are transported in network, likewise, the different users need different QoS requirement for the same application service. Therefore, Firstly, application services are classified, and QoS requirement for different application service is studied; secondly, the NPLs(Network Performance Level) are studied, and draw a conclusion, if NPL array corresponding to application service is assured in network, the application service of quality can be assured also. Thirdly, as an interface between application service and transport service can be expressed in policy, thus, mapping application service into transport service can be implemented by configuring the policy. Finally, WFQ (Weighted-Fair-Queue) algorithm is researched primarily based on DiffServ, and several simulation models based on NS2 are designed and different algorithms are simulated, the simulation results show that different application service of quality can be assured by corresponding to scheduling algorithm in DiffServ mechanism model. By means of policy idea, the complicated issues for mapping application services into transport service can be solved, and different scheduling algorithm in DiffServ are fit for different application services’ QoS assurance.
Proc. SPIE. 5284, Wireless Communications and Networks
KEYWORDS: Data modeling, Control systems, Data transmission, Computer simulations, Relays, Dynamical systems, Wireless communications, Computer architecture, Network architectures, Mobile communications
In current research on mobile ad-hoc networks, protocol evaluation is always needed. However, building real test-beds are costly, and sometimes infeasible, especially for large-scale mobile ad-hoc networks. Therefore, simulation systems are provided. Unfortunately, exiting simulation systems have obvious defects. They can hardly support scalability or real-time simultaneously, neither changeable network nodes. To remedy these problems, we propose a test system named ManTS in this paper. With distributed architecture and some novel mechanisms, such as Direct Transmission and Virtual Application Traffic, etc., ManTS is able to build testbeds for large-scale mobile ad-hoc networks and guarantee real-time at the same time, and it also supports dynamic enrolment of network nodes. Furthermore, IP or upper layer protocols and applications implemented on Linux can run on ManTS without any modification.
With the fast development of Internet and wireless and mobile communication technology, the Mobile Internet Age is upcoming. For those providing Mobile Internet services, especially from the view of ISP (Internet Service Provider), current mobile IP protocol is insufficient. Since the Mobile IPv6 protocol will be popular in near future, how to provide a secure mobile IPv6 service is important. A secure mobile IPv6 network access system is highly needed for mobile IPv6 deployment. Current methods and systems are still inadequate, including EAP, PANA, 802.1X, RADIUS, Diameter, etc. In this paper, we describe main security goals for a secure mobile IPv6 access system, and propose a secure network access system to achieve them. This access system consists of access router, attendant and authentication servers. The access procedure is divided into three phases, which are initial phase, authentication and registration phase and termination phase. This system has many advantages, including layer two independent, flexible and extensible, no need to modify current IPv6
address autoconfiguration protocols, binding update optimization, etc. Finally, the security of the protocol in this system is
analyzed and proved with Extended BAN logic method, and a brief introduction of system implementation is given.
Computing today is becoming pervasive. To provide pervasive computing environments flexible, dynamic and less distractive security mechanisms, trust managements are introduced. However, current trust frameworks are designed for specific scenarios and can’t fulfill requirements in different environments, which leads to that these trust frameworks can’t be deployed in different environments and pervasive devices can’t enjoy pervasive computing anywhere really. To remedy this problem, this paper proposes a universal trust framework. In our framework, the flexible attribute vector model is used to represent trust evidence that are needed to evaluate trust relationships, thus the framework can work in identity-based trust environments as well as context-based trust environments. Besides,
the universal trust framework defines four kinds of trust relationships that are suitable o model trust relationships in
various scenarios. In a word, the proposed universal trust framework is an especially designed trust framework that can unify trust management in different pervasive computing cases.
Project background: we are engaged in research on service management for mobile Internet. It is well known that Internet will primarily become a service-driven-network, and services will be differentiated. The motivation for service management is to make service management automation, and the users will discovery all kinds of services provided by service providers conveniently. In order to reach theses goals, the one of the key issues for service description, or service
definition must be resolved. So, we research below three aspects’ issues: the firstly, the application services are classified, all the properties for every type of service are researched. Secondly, in order to model the service data model, we build the meta-model to describe the service data model, based on these meta-models, a general service data model is built in a kind of oriented-object modeling language, EXPRESS. Finally, based on the service data model described by EXPRESS and the definition for service template, a concrete service template can be generated by a tool for generating
service template automatically.
With evolution of Internet, next generation Internet primarily is a network-service-driven. In the future, Especially, Telecommunication network, computer network and wireless mobile network will be merged into an all-IP network,
services provided by this large scale network will increase by exponent. This will result in some critical problems--how to effectively manage these services provided by such network to make service users obtain their QoSguaranteed-service at anytime and anywhere. Study shows that the interaction between service providers and service
users, in practice, is a service level agreement (SLA) process. Therefore, SLA acts as quite importance, In this paper, a
kind of perspective of using service location protocol (SLP) to implement SLA is proposed based on fully researching
of SLP. The main idea is as follow: information of SLA object can be bound to user agents' (UA) request messages.
Comparison with conventional method, it not only cuts down the agreement numbers between service providers and
service users, but also saves network bandwidth and guarantees QoS.
The paper is related to TCP performance enhancement in Buffer Management of Mobile IPv6 where transmission control protocol is used as transport layer protocol. A mechanism that improves TCP performance in buffer management for Mobile IPv6 is proposed when handovers are normally taken place. By this mechanism, MB-aware routers can send
With the development of Internet technology, especially the conditions of wireless and mobility be migrated, more user's tasks with different QoS requirement will be implemented in Internet. However, user will front a network which state changes from the static to the dynamic, the QoS requirement will changes from the one for single network condition to the other for several heterogeneous. In the face of the complexity of the next generation network, traditional QoS concept model will not suit for this condition. In this paper, we propose a new QoS concept model QoSw for the next generation network. In QoSw, we define Network-space N and User-space U conceptions and analyze the mapping relations between N and U. We enlarge the scales of network QoS guarantee from the network-level for user's physical resource needs plus both the application-level for the application characteristics and the user-level characteristic for the user characteristics. Finally, the policy format of the QoS requirement can express better the semantics for user's needs, this will better adapt to the next generation network conditions and have a better expression for use's personality.