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Mobile computing emerged in recent years as a primary technological area because of the large increase of computing capability and connectivity of mobile devices. This trend has led to the exponential growth of mobile applications and pervasive digital data, even if it requires facing many research challenges. My main research goal is the investigation of new software solutions, applications and services...
In wireless mobile networks quality of user experience changes dynamically and depends on large variety of factors. Because of that mobile operators are willing to timely and effectively evaluate provided Quality of Service (QoS) in their networks. Nowadays the main tool for monitoring network state and performance is drive testing. To replace this expensive and mostly manual procedure, concept of...
The following topics are dealt: cyber engineering; human space computing; distributed networks; security and privacy; heterogeneous wireless networks; resource management; security in wireless systems; web services; web and mobile applications; data models and query processing; performance evaluation and testing; SOA and embedded systems; middleware; cloud computing; RFID; wireless sensor networks;...
As the ubiquitous society matures, mobile phones are equipped with agents, which support users in selecting the appropriate course of actions, for example, by giving guidance on where to change trains. However, since human society becomes more and more complex and sophisticated, agents capable of understanding the situation of each user (action plan, preferences, location, etc.) and providing support...
CAC is one of the most important parts of resource management in wireless cellular networks to keep the system work stable by accepting or rejecting users' service requests. A call admission control(CAC) algorithm(DQ-CAC) based on unfair quality of service(QoS) degradation and queue buffers in wireless mobile networks is proposed. The handoff call dropping probability(CDP) for the high priority, call...
In this paper, a teletraffic analysis method based on channel holding time statistics for new and handoff calls for system level performance evaluation of mobile cellular networks with link unreliability is developed. Firstly, mathematical expressions for the probability distribution function of channel holding time for new and handoff calls are derived considering different phase-type distributions...
In ground-based military maneuvers, group formations require flexibility when traversing from one point to the next. For a human-led team of semi-autonomous agents, a certain level of awareness demonstrated by the agents regarding the quality of the formation is preferable. Through the use of a Multi-Robot System (MRS), this work combines leader-follower principles augmented by an assistive formation...
There are more and more studies in focus on mobile ad hoc networks (MANETs). Because of the advantage of it can be constructed only by mobile hosts which work like routers. Even if no infrastructure, communication still can be proceeded. It is applicable in the urgent rescue, military battlefield and other situations that must temporarily construct the network. In MANET, mobile hosts (MHs) will store...
We propose an efficient method to re-allocate resources available on Mobile Ad-hoc Networks in the event of a network attack or a node failure. By utilizing a structure we call a resource fitness cache, we identify a way to reduce the number of messages required to find a suitable replacement resource among remaining nodes on the network, assuming that redundancy is present in among the resources...
In this paper, we focus on proactive radio resource management schemes that retain the quality of the individual connections by pre-reserving the needed resources in a cellular network. We propose a new scheme, which improves older proactive solutions. Typically, in such solutions an improvement in call dropping probability negatively impacts new call blocking probability. We improve this framework...
We consider a downlink resource allocation problem for two systems or cells each consisting of a base station and multiple mobile stations. Each cell operates on a protected band for exclusive use and a band shared with the other cell. On simultaneous transmission in the shared band, the two systems disturb one another with interference. The strategies of the systems are their choices of power allocations...
The question of energy savings has been a matter of concern since a long time in the mobile distributed systems and battery-constrained systems. However, for large-scale non-mobile distributed systems, which nowadays reach impressive sizes, the energy dimension (electrical consumption) just starts to be taken into account. In this paper, we present the GREEN-NET framework which is based on 3 main...
High service availability is difficult to achieve in mobile ad hoc networks. The service distribution protocol for mobile ad hoc networks increases the mobile service availability by employing coupled replication and hibernation mechanisms. In this paper, different hibernation behaviors are studied against the general performance of this protocol, especially the replica allocation correctness.
Recent work on component-based software design has proved the need of resource-accurate development of embedded software. In the more specific cases of mobile systems, the developer also needs tools to facilitate the adaptation of functionalities to resources (lack of memory or bandwidth, etc.), and also to evaluate the performance w.r.t. the resource issues. As we want to design and develop at the...
The broadcast problem including the plan design is considered. The data are inserted and numbered at predefined order into customized size relations. The server ability to create a full, Regular Broadcast Plan (RBP) with single and multiple channels after some data transformations is examined. The Regular Geometric Algorithm (RGA) prepares a RBP and enables the users to catch their items avoiding...
The idea of increasing data accessibility in mobile ad hoc networks (MANETs) by replicating data still remains a challenge due to the inherent unreliable and unstable nature of MANETs. Being aware of relative host mobility changes provides useful instability information of mobile hosts and helps in managing replicas. This paper introduces a new concept as node interactivity self assessment (NISA),...
The following topics are dealt with: circuit design; system design; information systems; Internet technology; artificial intelligence; software engineering education; service-oriented computing; information security; information privacy; wireless communication; sensor networks; mobile computing; mobile networking; software testing; high performance computing architecture; e-commerce; computer information...
Sensor networks have recently gained a lot of attention from the research community. Energy cost is an important constraint in task assignment of wireless sensor network (WSN). Sensor networks typically have a large number of nodes. To ensure scalability sensor networks are often partitioned into clusters, each managed by a cluster head (gateway). Tasks need to be allocated to gateways in such a way...
More and more mobile and embedded devices, such as home appliances and network devices, have selected OSGi as the software management platform. As a result, the resource management of the OSGi platform has become a critical issue. This paper focuses on how to enhance the efficiency of resource utilization in terms of the service activation and deactivation. We propose the service activator (SA), which...
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