Abstract: A method is disclosed for calculating the optimal number of base transceiver stations (BTSs) in a wireless network and for determining a loading factor value therefor. The wireless network has a plurality of BTSs, each station providing communication service to mobile stations. As a loading factor value increases, the traffic decreases and the coverage area increases. The method calculates the number of BTSs in accordance with a decrease in traffic and the number of BTSs in accordance with an increase in the coverage area; determines a loading factor value which minimizes a difference between the two number of BTSs; and determines the optimal number of BTSs according to the determined loading factor value.

Abstract: A method for determining the number of effective channels and the effective channel rate in a CDMA network is disclosed. The method calculates the ratio of the soft handoff area to the total service area and the soft handoff channel rate. The results are used to determine both the number of effective channels and the effective channel rate.

Abstract: A low-voltage excited red phosphor of the present invention has a matrix including an oxide of an alkali earth metal and titanium and doping elements including a rare-earth element, a group 13 element, and Zn. The phosphor has an improved lifetime and high brightness.

Abstract: A phosphor having longer lifespan which includes sulfur and has a perovskite structure.

Abstract: A phosphor having increased luminance and lifespan which includes a halide flux of the Group 1 element of the periodic table has a perovskite structure and satisfies the following formula:

Abstract: A phosphor compliant with formula (1) below and a perovskite structure containing samarium (Sm):

Abstract: A method for reducing the number of channel cards in a base station by sharing channels between a plurality of frequency assignments and between a plurality of sectors of the base station during a traffic overload in a code division multiple access (CDMA) system of the type having a plurality of cells with each cell containing the sectors and each sector having a group of traffic channels and a group of frequency assignments to it that is same as the group of frequency assignments to other said sectors within that same cell, the method comprising the step of setting traffic channels to accommodate requests within the base station, the step of determining whether said set traffic channels are to be shared between the frequency assignments and/or between the sectors, in the event that the set channels are shared only between the frequency assignments, the step of determining the number of channel cards by calculating XY W , in event that the set channels are shar

Abstract: A display device includes a backlight having a main emitting peak in the region of 380-420 nm, a polarizer for selecting light having prescribed direction among the light emitted from a backlight source and an analyzer for receiving the selected light, a pair of electrodes provided between the polarizer and analyzer, optoelectronic material such as liquid crystal materials and PLZT provided between the electrodes, and a phosphor layer including phosphors which can be stimulated by exposure to the light from the backlight source. The display device has an increased viewing angle and improved luminance.