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Social media keeps growing and providing us with rich sources of information to understand our everyday lives, customs, and culture in the form of periodic topics. This paper proposes a method of detecting periodic topics based on autocorrelation using the time series of the document frequencies of keywords. To deal with the massive amount of data collected from social media, this method is implemented...
The number of wireless Internet service users that use wireless LAN or satellite links has increased. The broadband satellite Internet services have especially attracted attention because of its characteristics such as global coverage and robustness. TCP (transmission control protocol) is used by many typical applications over satellite Internet. However, a typical TCP (such as TCP-NewReno) which...
By development and the spread of a wireless technology,the mobile ad hoc network (Manet) that can be easily constructed only with mobile nodes is getting much attention.However, it is difficult to control the performance of the entire network appropriately, as a network consists of individual communication nodes operating autonomously and there is no device that controls the entire network. Recently,...
This paper proposes a mutual detection mechanism between spam blogs and keywords for filtering spam blogs from updated blog data. Spam blogs are problematic in extracting useful marketing information from the blogosphere; they often appear to be rich sources of information based on individual opinion and social reputation. One characteristic of spam blogs is copied-and-pasted articles based on normal...
In eddy-current sensors and eddy-current testing, it is important to analyze the magnetic field of the coil. Toward this end, we analyzed magnetic fields in various coils, such as circular and rectangular coils. We used the double Fourier transformation and applied it to the eddy-current problem of coils facing a sheet conductor. However, only a limited number of coil shapes could be analyzed by this...
We demonstrate the operation of programmable logic gates using organic ferroelectrics. The vinylidene fluoride(VDF) oligomer, which is an organic ferroelectric with low molecular weight, was used as organic ferroelectric. Multilayer structure, Al/VDF/Al/VDF/Al, was fabricated on flexible substrate by vacuum deposition. A rectangular polarization hysteresis loop was observed in VDF oligomer thin film...
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