Development of a distributed geometric modeling system based on peer to peer

Distributed systems are required in industrial environments for collecting distributed information. The developed distributed CAD system has sharing of functions, which consist of a client and server as a Peer to Peer (P2P) system. It is constructed using CAD kernel and COM/DCOM technology to share functions on a network. In recent years, the distributed system has been applied to industries for combining work functions. Here, the requester is the client, and the provider is the server. The developed system in this study shares the functions among the systems through a P2P structure. All systems linked to a local network can use the functions of the other systems. The importance of constructing this kind of distributed CAD system is for transferring 3D model data for gaining access to the location of the providers. This system can perform many operations concurrently using other systems and can save time on work. Some of the operations performed and tested by the developed distributed CAD system are Boolean operation, obtaining properties, triangulation, and tessellation.     

Energy‐efficient resource allocation for device‐to‐device communication through noncooperative game theory

Wireless network with high data rate applications has seen a rapid growth in recent years. This improved quality of service (QoS) leads to huge energy consumption in wireless network. Therefore, in order to have an energy‐efficient resource allocation in cellular system, a device‐to‐device (D2D) communication is the key component to improve the QoS. In this paper, we propose a noncooperative game (NCG) theory approach for resource allocation to improve energy efficiency (EE) of D2D pair. A three‐tier network with macrocell base station (MBS), femtocell base station (FBS), and D2D pair is considered, which shares the uplink resource block. A resource allocation strategy with constraints is arrived, which maintains minimum throughput for each user in the network. The proposed resource allocation strategy optimizes the EE of D2D pair in the three‐tier network, which achieves Nash equilibrium (NE) and Pareto optimality (PO). Simulation results validate that EE is uniform and optimum for all D2D pair, which converges to NE when channel is static and it converges to PO when the channel is dynamic.     

Legibility difference between e-books and paper books by using an eye tracker

The aim of the study was to evaluate the difference in legibility between e-books and paper books by using an eye tracker. Eight male and eight female subjects free of eye disease participated in the experiment. The experiment was conducted using a 2 × 3 within-subject design. The book type (e-book, paper book) and font size (8 pt, 10 pt, 12 pt) were independent variables, and fixation duration time, saccade length, blink rate and subjective discomfort were dependent variables. In the results, all dependent variables showed that reading paper books provided a better experience than reading e-books did. These results indicate that the legibility of e-books needs further improvement, considering fixation duration time, saccade movement, eye fatigue, device and so on.     

Analysis of processing time between distributed geometric modeling systems

In recent years, the concept of distributed systems has been applied to industries to enable cooperative work and collect distributed information. A distributed geometrical modeling system has been developed to share the functions among the systems on the network with a peer-to-peer (P2P) structure. The systems that are linked on the network can use functions of other systems. Such a network can perform operations concurrently by using other systems, which saves time. The importance of constructing this kind of distributed CAD system is to transfer three-dimensional (3D) CAD model data and access the locations of providers. The developed system has a sharing of functions, which consist of client (requester) and server (provider) as a P2P system, and is constructed by using a CAD kernel and COM/DCOM technology. Simple operations have been performed and tested by the developed system, such as Boolean operation, obtaining properties, triangulation and tessellation. The developed system has been evaluated with stand-alone and client–server systems for simple operations based on two criteria. In the first evaluation, the processing timings have been compared for simple operations among the systems: the stand-alone system is faster than the other systems. In the second evaluation, the systems are overloaded and the processing timings have been compared: the developed system is faster than the other systems.     

Few Atomic Layered Lithium Cathode Materials to Achieve Ultrahigh Rate Capability in Lithium‐Ion Batteries

The most promising cathode materials, including LiCoO₂ (layered), LiMn₂O₄ (spinel), and LiFePO₄ (olivine), have been the focus of intense research to develop rechargeable lithium‐ion batteries (LIBs) for portable electronic devices. Sluggish lithium diffusion, however, and unsatisfactory long‐term cycling performance still limit the development of present LIBs for several applications, such as plug‐in/hybrid electric vehicles. Motivated by the success of graphene and novel 2D materials with unique physical and chemical properties, herein, a simple shear‐assisted mechanical exfoliation method to synthesize few‐layered nanosheets of LiCoO₂, LiMn₂O₄, and LiFePO₄ is used. Importantly, these as‐prepared nanosheets with preferred orientations and optimized stable structures exhibit excellent C‐rate capability and long‐term cycling performance with much reduced volume expansion during cycling. In particular, the zero‐strain insertion phenomenon could be achieved in 2–3 such layers of LiCoO₂ electrode materials, which could open up a new way to the further development of next‐generation long‐life and high‐rate batteries.     

A novel approach for the biosynthesis of silver oxide nanoparticles using aqueous leaf extract of Callistemon lanceolatus (Myrtaceae) and their therapeutic potential

This study describes a novel biological route for the biosynthesis of silver oxide nanoparticles utilising the aqueous extract of Callistemon lanceolatus D.C. leaves. Formation of silver oxide nanoparticles was confirmed by UV–visible spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscope–energy dispersive X-ray spectroscopy and X-ray diffraction spectroscopy analysis. The biologically synthesised silver oxide nanoparticles were found to be 3–30 nm in size with spherical and hexagonal shape by high-resolution transmission electron microscope analysis. Furthermore, the biogenic silver oxide nanoparticles demonstrated significant (p?in vitro antioxidant methods. These particles also exhibited significant (p?相似文献   

Performance analysis of image steganography using wavelet transform for safe and secured transaction

Multimedia Tools and Applications - Internet applications are increased and growing at efficient way. By this technological growth, data communication in the internet in secured way has got a...