Abstract: An alarm display apparatus includes an acquisition module, a plant simulation module, a prediction module, an actual measurement alarm determination module, an estimation alarm determination module, a prediction alarm determination module and a display module. The display module displays, on the same screen, an actual measurement alarm information outputted from the actual measurement alarm determination module, an estimation alarm information outputted from the estimation alarm determination module and an prediction alarm information outputted from the prediction alarm determination module.

Abstract: An information communication system comprises: a one-way channel (20) for passing data transmitted from an external network (200) and not passing data from an information communication system (100) to the external network (200); a data scrambling or encrypting apparatus (22) for encrypting the data which has passed through the a one-way channel (20); a first information processing unit (30) for storing the data processed by the encryption apparatus (22) in an external storage device (40) having a plurality of I/O ports (42, 44), at least one of which is a read-dedicated port (44) and at least one of which is a read/write port (42), via the read/write port (42); and a second information processing unit (50) for reading out the data stored in the external storage device (40) via the read-dedicated port (42) and decrypting it.

Abstract: There is disclosed an information processing system which makes it impossible for a malicious third person to intrude thereinto from the outside through an external network for altering information recorded on a storage device of the server system or surreptitiously reading mails in the mailbox. This information processing system comprises a writable storage device (21), first and second input/output channels (18 and 19) connected to the storage device (21), a first computer (22) connected to the first input/output channel (18) and a second computer (23) connected to the second input/output channel (19). The first computer (22) is connected to an external network (24) such as the Internet and an intranet. The first input/output channel (18) is arranged as a channel exclusively for performing reading from the storage device (21) or a channel exclusively for performing writing into an empty area of the storage device (21) in dependence on the application of this information processing system.

Abstract: Disclosed are a server system and a security system equipped with a function for preventing illegitimate alteration of data, which are simple and inexpensive, and are capable of operating safely on a 24-hour basis. In a server system equipped with a hard disk drive, which stores at least an operating system, an application software and a content data, and receives connections from a plurality of clients through a network, the hard disk drive is provided with a mode changing switch capable of physically switching the mode of the hard disk drive between a normal mode in which writing to the hard disk drive can be performed and a read-only mode in which writing cannot be performed, whereby the hard disk drive can be operated in the read-only mode.

Abstract: There is disclosed an information processing system which makes it impossible for a malicious third person to intrude thereinto from the outside through an external network for altering information recorded on a storage device of the server system or surreptitiously reading mails in the mailbox. This information processing system comprises a writable storage device (21), first and second input/output channels (18 and 19) connected to the storage device (21), a first computer (22) connected to the first input/output channel (18) and a second computer (23) connected to the second input/output channel (19). The first computer (22) is connected to an external network (24) such as the Internet and an intranet. The first input/output channel (18) is arranged as a channel exclusively for performing reading from the storage device (21) or a channel exclusively for performing writing into an empty area of the storage device (21) in dependence on the application of this information processing system.