Very preliminary version; 09/23/07. I am grateful to John Hagedoorn and Wilko Letterie for their invaluable support and advice. I am also very appreciative of the helpful comments and suggestions offered

Nowadays, developed and applied hydrology become very important thing in the life due to the wide verity advantages for the applications of this field. Hydraulic Structures such as crump weir are placed in channels to estimate or measure flow rate and flow control devices. In this study there is a new performance for crump weir which appears by adding opening holes in the model  of crump weir. ...

Sensor tasking is essential to many sensing applications in resourceconstrained wireless ad hoc sensor networks. In this paper, we present a multi-step lookahead algorithm for sensor selection and information routing. The algorithm is based on the informationdriven sensor querying (IDSQ) that uses mutual information as a utility meature for potential information contribution of individual senso...

The routing of messages is one of the basic operations any computer network needs to provide. In this thesis, we consider wireless ad hoc and sensor networks and present several routing protocols that are tailored to the limited hardware capabilities of network participants such as sensor nodes. The constraint memory and computing power as well as the limited energy of such devices requires sim...

in this research, performance of pattern search algorithm (ps) was investigated in order to optimize the nonlinear muskingum model parameters in contrast with the general algorithms, for wilson and karoun floods routing. wilson flood routing has been chosen to compare the ability of ps algorithm with other algorithms and, karoun flood routing has been chosen for a better evaluation of ps. the r...

The existence of a mobile sink for gathering data significantly extends wireless sensor networks (WSNs) lifetime. In recent years, variety efficient rendezvous points-based mobility approaches has been proposed avoiding the energy sink-holes problem nearby sink, diminishing buffer overflow sensors, and reducing latency. Nevertheless, lots research carried out to sort holes using controllable-ba...

A wireless sensor network (WSN) is one of the fundamental services provided by the monitoring of a specific Region of Interest (RoI). WSNs due to holes in RoI exposure is unavoidable considering the fact that the inner nature, environmental factors, random Uses, and external attacks, is to ensure that revenue is covered completely and consistently Key. This paper seeks to issue mobile WSNs hole...

We develop a contingency theory for how structural closure in a network, defined as the extent to which an actor’s network contacts are connected to one another, affects the initiation and adoption of change in organizations. Using longitudinal survey data supplemented with eight indepth case studies, we analyze 68 organizational change initiatives undertaken in the United Kingdom’s National He...

An increasing number of students, professionals, and job-recruiters are using Social Network Sites (SNSs) for sharing information. There has been limited research assessing the role of individuals seeking a job and receiving information about job openings in SNSs. In this regard, do students, non-managers, and managers benefit from job offers when they are a member of SNSs such as Facebook or L...

one of the important issues in transportation and logistics systems is vehicle routing problem (vrp). the vehicle routing problem is concerned with finding efficient routes of minimum total cost, beginning and ending at a central depot, for a fleet of vehicles to serve a number of customers. on the other hand, as a result of the increasing environmental concerns, economic problems and pressure ...