The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Today, consumers have been able to buy various items with development of e-commerce sites and so on, while it made difficult to find items suitable for the consumer's preference from many items. Because of such situation, recommendation systems that can present items suitable for user's preference have been required. When a person prefers an item, but hesitates what to do, it is an important criterion...
This paper proposes an efficient multiuser relaying scheme in OFDMA systems. In the proposed scheme, multiple terminals transmit packets simultaneously in the same subband and multiple relay stations retransmit their received signals in different subbands after subband conversion. The base station (BS) extracts each packet from multi-dimensional signals received at the different subbands. In advance...
Simple and scalable composite right/left-handed (CRLH) waveguide slot antennas using a cut-off waveguide and periodic short-ended stubs are proposed for low-loss and high-power applications. It is shown that the balanced CRLH condition can be realized and the CRLH waveguide can be used as a leaky-wave antenna with backward to forward radiations including broadside radiation by introducing small radiation...
A beam scan leaky wave antenna at a fixed frequency is proposed. Metal strips with a switching diode are arranged above a slot line. A combination of metal strips is excited selectively by switching the corresponding diode to make a beam. By changing the combination the beam can be scanned from 60 deg. to 120 deg., 17% of power into the antenna is lost owing to the diodes. The value is comparatively...
A composite right/left-handed waveguide-type transmission line with a variable phase constant is proposed. The transmission line is composed of a cutoff waveguide and short stubs. The phase constant can be changed from -30 deg. to +30 deg. per a unit cell by moving a dielectric in the stubs and the top wall of the stubs mechanically. The phase constant changes continuously because the right-handed...
We are developing an Electron-Tracking Compton imaging Camera (ETCC) based on a gaseous Time Projection Chamber (TPC) and a scintillation camera. The ETCC detects the energy and the direction of the incident gamma ray using the information of the recoil electron and the scattered gamma ray. We have developed the ETCC with a detection volume of 23 × 28 × 30 cm3 which consists of the 23 × 28 × 30 cm...
The demand for content distribution services via wireless local area networks has been increasing. A multi-cell structure, which consists of multiple access points (APs), is more suitable for distributing content in wider areas. However, in multicast, there had been an unsolved issue; how to compensate for data-frame loss for each user. In particular, in wireless links, loss compensation techniques...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.