in a closed die forging process, it is impossible to form complex shapes in one stage, and thus it becomes necessary to use preform dies. in the present study, backward deformation method and fe simulation via abaqus software has been used in order to design preform die of the h-shaped parts. in the backward deformation method, the final shape of the part is considered as a starting point and u...

Simple Network Management Protocol version 3 is an extension of earlier versions addressing security and administration features of SNMP. SNMPv3 has additional features like different message format and defines new management information bases (MIB) for security, configuration, notification, view-based access control and proxy forwarding. Simulation of SNMPv3 traffic flow meter MIB has been car...

The paper deals with the distributed solution of simulation based nonlinear constrained optimization problems in engineering on a network of workstations. This type of non-linear optimization and control problems in engineering can be generally characterized as non{convex and non-smooth. Additionally, the involved simulation introduces certain numerical "noise\ to the solution process. These ch...

Testing and evaluating the performance of actual software for wireless networks is difficult. Real-world wireless testbeds are costly and cumbersome to maintain. Measurement studies are complicated by many uncontrollable environmental influences, particularly the wireless channel. Network simulations on the contrary allow the convenient analysis of wireless networks with a maximum level of cont...

a wireless sensor network consists of many inexpensive sensor nodes that can be used toconfidently extract data from the environment .nodes are organized into clusters and in each cluster all non-cluster nodes transmit their data only to the cluster-head .the cluster-head transmits all received data to the base station .because of energy limitation in sensor nodes and energy reduction in each d...

Discrete event simulation is widely used within the networking community for purposes such as demonstrating the validity of network protocols and architec-tures. Depending on the level of detail modeled within the simulation, the running time and memory requirements can be excessive. The goal of our research is to develop and demonstrate a practical, scalable approach to parallel and distribute...

the basic structure of a reactor physics laboratory environment simulation software, developed using object modeling technique (omt), and based on the reactor point kinetic equation, is presented. also, various capabilities of the simulator in teaching the fundamental concepts of reactor physics are discussed. in this virtual laboratory, student can perform seven different experiments, namely, ...

important parameters on apple drying process are investigated experimentally and modeled employing artificial neural network and neuro-taguchi's method. experimental results show that the apple drying curve stands in the falling rate period of drying. temperature is the most important parameter that has a more pronounced effect on drying rate than the other two parameters i.e. air velocity and ...

Since the first large-scale computer network was built in the early 1960s, the protocol design problem has become a more important issue to efficiently coordinate distributed system nodes. Recently, in response to the fast growing demand for connecting various devices with current network infrastructures, many intricate protocols have been designed to support communications across such heteroge...