Abstract: A storage medium storing a mail management program, the mail management program causing a computer to execute: receiving from a first user, a designation of a first electronic mail addressed to the first user as an open mail, which is made open to a second user, first setting a receiving date and time at which the designation is received as date and time information corresponding to the open mail, second setting another receiving date and time at which a second electronic mail which is not the open mail and is addressed to the second user is received by the computer, as the date and time information corresponding to the second electronic mail and outputting, upon receipt of an output instruction from the second user, the open mail and the second electronic mail in accordance with the date and time information.

Abstract: An image processor includes an encoder and a decoder. The encoder includes a frequency transform unit, a pre-filter, and a color conversion unit that converts a pixel signal of a first color space inputted from outside into a pixel signal of a second color space including a luminance signal and chrominance signals. The decoder includes a frequency inverse transform unit, a post-filter, and a color inverse conversion unit that inversely converts a pixel signal of the second color space into a pixel signal of the first color space. The pre-filter performs prefiltering on one or plural specific signals among the luminance and chrominance signals. The post-filter does not perform postfiltering on the above specific signals.

Abstract: An image processor includes a frequency transform unit performing frequency transform independently on a luminance signal and plural chrominance signals and outputting an item of frequency data of the luminance signal and plural items of frequency data of the chrominance signals, and a quantization unit performing quantization independently on plural items of frequency data inputted from the frequency transform unit. The quantization unit performs quantization on one or plural specific items of frequency data corresponding to a signal with noise among the frequency data of the luminance signal and the chrominance signals, employing a quantization coefficient having a value greater than “1”, and performs quantization on frequency data apart from the specific items of frequency data, employing a quantization coefficient having a value “1”.

Abstract: In a first input step from outside to an image processor, a signal input unit inputs to a pre-filter a first part of first luminance signals inputted from outside, which is a part to be processed by the pre-filter in the first input step, and stores a remaining second part of the first luminance signals in the memory unit. In a second input step following the first input step, the signal input unit inputs to the pre-filter the second part of the first luminance signals read from the memory unit and a first part of second luminance signals inputted from outside, which is a part to be processed by the pre-filter in the second input step, and stores a remaining second part of the second luminance signals in the memory unit.

Abstract: An image processor includes a frequency transform unit performing frequency transform on a first pixel block as a target block, and a pre-filter performing prefiltering with a region which overlaps with plural unit regions for processing by the frequency transform unit as a unit region for processing, before frequency transform is performed. The pre-filter performs prefiltering on a second pixel block being a predetermined number of pixels each larger horizontally and vertically than the first pixel block as a target block. The pre-filter performs prefiltering sequentially on a plurality of second pixel blocks aligned horizontally. The number of pixel signals in a vertical direction within a group of pixel signals continuously inputted to the pre-filter for prefiltering is equal to the number of rows in the second pixel block.

Abstract: A storage medium storing a mail management program, the mail management program causing a computer to execute: receiving from a first user, a designation of a first electronic mail addressed to the first user as an open mail, which is made open to a second user, first setting a receiving date and time at which the designation is received as date and time information corresponding to the open mail, second setting another receiving date and time at which a second electronic mail which is not the open mail and is addressed to the second user is received by the computer, as the date and time information corresponding to the second electronic mail and outputting, upon receipt of an output instruction from the second user, the open mail and the second electronic mail in accordance with the date and time information.

Abstract: An image processor includes a frequency transform unit performing frequency transform on a first pixel block as a target block, and a pre-filter performing prefiltering with a region which overlaps with plural unit regions for processing by the frequency transform unit as a unit region for processing, before frequency transform is performed. The pre-filter performs prefiltering on a second pixel block being a predetermined number of pixels each larger horizontally and vertically than the first pixel block as a target block. The pre-filter performs prefiltering sequentially on a plurality of second pixel blocks aligned horizontally. The number of pixel signals in a vertical direction within a group of pixel signals continuously inputted to the pre-filter for prefiltering is equal to the number of rows in the second pixel block.

Abstract: An envelope has a glass bulb body and a cylindrical glass bulb base. The glass bulb body includes an upper hemisphere and a lower hemisphere. The upper hemisphere is curved in a substantially spherical shape. The lower hemisphere is substantially curved in a spherical shape and connects the upper hemisphere and glass bulb base. A photocathode is formed on the inner surface of the glass bulb body. An avalanche photodiode is disposed on the glass bulb body side relative to an intersection between an imaginary extended curved surface of the lower hemisphere within the glass bulb base and an axis. When light enters the photocathode, electrons are emitted from the photocathode. The electrons are converged at the position above and in the vicinity of the APD by an electrical field in the electron tube, so that the electrons enter the APD in an efficient manner and are detected satisfactorily.

Abstract: An image processor includes an encoder and a decoder. The encoder includes a frequency transform unit, a pre-filter, and a color conversion unit that converts a pixel signal of a first color space inputted from outside into a pixel signal of a second color space including a luminance signal and chrominance signals. The decoder includes a frequency inverse transform unit, a post-filter, and a color inverse conversion unit that inversely converts a pixel signal of the second color space into a pixel signal of the first color space. The pre-filter performs prefiltering on one or plural specific signals among the luminance and chrominance signals. The post-filter does not perform postfiltering on the above specific signals.

Abstract: An image processor includes a frequency transform unit performing frequency transform independently on a luminance signal and plural chrominance signals and outputting an item of frequency data of the luminance signal and plural items of frequency data of the chrominance signals, and a quantization unit performing quantization independently on plural items of frequency data inputted from the frequency transform unit. The quantization unit performs quantization on one or plural specific items of frequency data corresponding to a signal with noise among the frequency data of the luminance signal and the chrominance signals, employing a quantization coefficient having a value greater than “1”, and performs quantization on frequency data apart from the specific items of frequency data, employing a quantization coefficient having a value “1”.

Abstract: In a first input step from outside to an image processor, a signal input unit inputs to a pre-filter a first part of first luminance signals inputted from outside, which is a part to be processed by the pre-filter in the first input step, and stores a remaining second part of the first luminance signals in the memory unit. In a second input step following the first input step, the signal input unit inputs to the pre-filter the second part of the first luminance signals read from the memory unit and a first part of second luminance signals inputted from outside, which is a part to be processed by the pre-filter in the second input step, and stores a remaining second part of the second luminance signals in the memory unit.

Abstract: A method, to facilitate sending and receiving e-mails, includes: reading mail information from a mail-information memory regarding accessible e-mail accounts to which an authenticated user is permitted to have access; providing the mail information specific to a first one of the accessible email accounts; receiving a switching instruction to switch to a second one of the accessible email accounts; and automatically providing the mail information specific to the second one of the accessible email accounts upon accepting the switching instruction. The method may further include: accepting a reply instruction for creating a reply mail relative to an e-mail read at the second one of the accessible email accounts; and setting a reply address for the reply email to be the address associated with the second one of the accessible email accounts.

Abstract: A method to facilitate sending and receiving e-mails, the method including: providing a memory including mail-status-information indicating whether a received e-mail has been opened; detecting opening of the received e-mail; updating the mail status information stored in the memory upon detection of the opening of the received e-mail; accepting a status request for the mail status information; and reading the mail status information from the memory and providing the same upon acceptance of the status request.

Abstract: An apparatus of a mail sending and receiving system includes an authentication unit, an account determining unit, and an operation-instruction accepting unit. The authentication unit authenticates a login by a user to an entry account. The account determining unit reads account information, and determines one or more other accounts for which e-mail operations may be performed by an authenticated user. The operation-instruction accepting unit accepts an operation instruction causing an operation to be performed on an email in one of the determined accounts.

Abstract: In an electron tube, an insulating tube protrudes inside an envelope. One end of the insulating tube is connected to the envelope. An avalanche photo diode (APD) is provided on the other end of the insulating tube. A ground voltage is applied to the envelope and a positive high voltage is applied to the APD. Photoelectrons which are emitted in response to an incident light on a photocathode are converged by an electrical field in the envelope and enter the APD. Thereafter, the incident photoelectrons are amplified and detected. Since a positive high voltage is not exposed to the envelope, the electron tube can easily be handled and is excellent in safety.

Abstract: A photocathode is formed on a predetermined portion of the internal surface of an envelope of an electric tube. An avalanche photodiode (APD) is provided inside the envelope. The APD is surrounded by a cover and a tubular inner wall. A manganese bead and an antimony bead serving as evaporation sources are disposed in the vicinity outside the inner wall. The manganese bead and the antimony bead are surrounded by a tubular outer wall. The manganese bead and the antimony bead generate metal vapor to thereby form the photocathode. In forming the photocathode, the cover, inner wall, outer wall prevent the metal vapor from being deposited on the APD or an unintended portion inside the electron tube.

Abstract: An envelope (2) has a glass bulb body (4) and a cylindrical glass bulb base (5). The glass bulb body (4) includes an upper hemisphere (4a) and a lower hemisphere (4b). The upper hemisphere (4a) is curved in a substantially spherical shape. The lower hemisphere (4b) is substantially curved in a spherical shape and connects the upper hemisphere (4a) and glass bulb base (5). A photocathode (11) is formed on the inner surface of the glass bulb body (4). An avalanche photodiode (APD) (15) is disposed on the glass bulb body (4) side relative to an intersection (S) between an imaginary extended curved surface (I) of the lower hemisphere (4b) within the glass bulb base (5) and an axis (Z). When light enters the photocathode (11), electrons are emitted from the photocathode (11). The electrons are converged at the position above and in the vicinity of the APD (15) by an electrical field in the electron tube (1), so that the electrons enter the APD (15) in an efficient manner and are detected satisfactorily.

Abstract: In an electron tube, one end of an insulating tube is protruded toward the inside of an envelope, and an avalanche photodiode (APD) is provided on the one end of the insulating tube. Another end of the insulating tube is connected to an outer stem of the envelope. Alkali sources are provided inside the envelope. The alkali sources are disposed inside the envelope and generates alkali metal vapor to thereby form a photocathode on a predetermined part of the internal surface of the envelope. The alkali sources and insulating tube are isolated from each other by a separating member. When the electron tube is manufactured, the alkali metal vapor that is generated from the alkali sources is not deposited on the insulating tube due to existence of the separating member. This prevents voltage resistance between the envelope and APD from being decreased and the electrical field in the electron tube from being adversely affected, thereby preventing incident efficiency of electrons to the APD from being decreased.

Abstract: In an electron tube, one end of an insulating tube is protruded toward the inside of an envelope, and an avalanche photodiode (APD) is provided on the one end of the insulating tube. Another end of the insulating tube is connected to an outer stem of the envelope. Alkali sources are provided inside the envelope. The alkali sources are disposed inside the envelope and generates alkali metal vapor to thereby form a photocathode on a predetermined part of the internal surface of the envelope. The alkali sources and insulating tube are isolated from each other by a separating member. When the electron tube is manufactured, the alkali metal vapor that is generated from the alkali sources is not deposited on the insulating tube due to existence of the separating member. This prevents voltage resistance between the envelope and APD from being decreased and the electrical field in the electron tube from being adversely affected, thereby preventing incident efficiency of electrons to the APD from being decreased.

Abstract: A photocathode is formed on a predetermined portion of the internal surface of an envelope of an electric tube. An avalanche photodiode (APD) is provided inside the envelope. The APD is surrounded by a cover and a tubular inner wall. A manganese bead and an antimony bead serving as evaporation sources are disposed in the vicinity outside the inner wall. The manganese bead and the antimony bead are surrounded by a tubular outer wall. The manganese bead and the antimony bead generate metal vapor to thereby form the photocathode. In forming the photocathode, the cover, inner wall, outer wall prevent the metal vapor from being deposited on the APD or an unintended portion inside the electron tube.