Assays for identifying compounds that modulate, preferably inhibit bitter taste associated with the activation of hT2R4, hT2R44 andor hT2R61 are provided. The panel has a light-pervious member. The angle of inclination with respect to the screen is detected from the rotational angle associated with the maximum value of the level of the reflected wave thereby to correct the trapezoidal distortion. Both of the server and the client of the present invention support the live time-shift function based on the P2P technology, which may support mass parallel applications. The first arc of contact being equal to or greater than about 105 and the second arc of contact being at least 20 greater than the first arc of contact. A cooling fin washing system with pressurized jets is provided in one embodiment to wash the pollutants from the surface of the cooling fins.