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Measurement of crank-shaped waveguide in twodimensional square-lattice photonic crystal structure composed of ceramic pillars was done to investigate its fundamental transmission and reflection characteristics. For understanding of propagation of the electromagnetic field, simulation results based on confined interpolated profile (CIP) method are also demonstrated. Both of the results showed good...
The purpose of this study is making clear factors of what affects the contents of software reviews posted by customers at electronic commerce (e-Commerce) websites. Frequent referring to such reviews helps people to buy something. However, it is considered difficult to judge the quality of contents with reviews completely, because conditions for each software, such as, published data, categories,...
An interactive animation is a presentation of moving pictures that behave dynamically according to the input from users. It can be composed of animation characters modeled as finite-state machines. Based on the fact that the behavior of a finite-state machine can be defined by a state-transition diagram, an interactive animation authoring tool called Islay has been developed. Islay allows users to...
Social media such as Twitter and Facebook have become popular. In the age of social media, many people have become more active online. Personal branding is a very important strategy for capitalizing on individual strong points. This kind of branding is expected to contribute to self-actualization. Therefore, the presence of mentors who advise users to find their strong points for self-actualization...
Due to the recent popularization of Geographic Information Systems (GIS), spatial network environments that can display the changes of spatial axes in mobile phones have received much attention. In addition, many users use location-based services, which are one input devices of GIS. Many researchers have proposed methods of k-Nearest Neighbor (kNN) search that have a bi-directional relationship from...
The recent development of hybrid broadcasting environments has meant that video delivery has attracted great attention. In hybrid broadcasting environments, clients can receive data both from a broadcasting system and a communication system. Some interruption time reduction methods have been proposed for video delivery in these environments. However, in these methods, the server does not change the...
In recent years, study meeting is widely popular among engineers, especially who are engaged in the information technologies. For Japanese IT engineers, there is an famous web service titled "The IT Study Meeting Calendar," where anyone who wants to advertise any type of study meeting can put the information of the events. In this study, the set of information was gathered from the calendar...
This paper is concerned with an estimation of the target detection rate for aircraft surveillance system. Recently, the passive surveillance system has been expected to be used as a new aircraft surveillance system. In the passive surveillance system, since reflected/scattered powers from aircraft are generally much smaller than incident power from a source, it is difficult to detect only the desired...
This paper is concerned with the numerical simulation of electric field distributions in urban areas by using the 1-ray model combined with 2-ray model. Introducing the amplitude modification factor and the propagation order of distance, the 1-ray model is arranged so that we can approximately but efficiently estimate propagation characteristics in complicated environments. We show that the two parameters...
This paper discusses statistical properties of electromagnetic (EM) wave propagation along random rough surface (RRS). RRS is generated by the convolution method which employs the amplitude spectrum density function expressed in an analytical form and characterized by the standard height deviation do and the correlation length cl of RRS. Ensemble average of EM field distributions along RRSs is computed...
Business logs on information systems have greatly improved business efficiency. Log records can be easily found by keyword search if we only know right keywords. Further efficiency may be achieved by a system that automatically shows log records in the past related to what the user is currently doing or what is likely to happen in the near future even if the user does not notice their existence. In...
In order to ensure the correct processing of transactions, we introduced the concept of serializability. However, both serializability and relevant properties within transaction-based applications might be affected. Ensuring serializability of transactions in corrupted systems is amongst the requirements which allow to process properly interrelated transactions, preventing from blocking situations...
An intense electromagnetic field propagating ionized gas induces a plasma oscillation and a wake field structure behind the pulse. When the electromagnetic field propagates in a gas-media the field ionizes the gas which leads to a density in homogeneity. The effect of ionization on wake field formation is investigated by using particle simulations.
In this paper, we propose and evaluate a new fuzzy-based reliability system for Peer-to-Peer (P2P) Communications in JXTA-Overlay that decides the Peer Reliability (PR). In our system, we considered three input parameters: Number of Interactions (NI), Local Score (LS), Security (S). We evaluate the proposed system by computer simulations. The simulation results have shown that the proposed system...
This paper adapts a new group signature (GS) scheme to the specific needs of a vehicular ad hoc network (VANET). We modify the Groth GS in order to meet a restricted, but arguably sufficient set of privacy properties. Note that Groth GS is secure in the dynamic group signature model of Bellare, Shi, and Zhang (BSZ) without relying on random oracle Model (ROM). Although some authentication schemes...
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