Nec Corporation

Ricoh Company, Ltd.

Akira Uematsu

Koichi A Ono

Akihisa Kurashima

Kazuhiro Sakata

Shigehiro Ichimura

Shinya Kamijo

An image forming apparatus includes processing circuitry and a sensor. The processing circuitry controls formation of an image of an evaluation pattern on a transfer object. The sensor measures the image of the evaluation pattern formed on the transfer object. The processing circuitry presents a determination result of a cause of a failure based on a comparison between a reference value serving as a reference of the evaluation pattern and a measured value of the image of the evaluation pattern by the sensor.

Image forming apparatus, diagnostic method, and non-transitory recording medium

In a content delivery system, a gatekeeping apparatus is connected to a network. Prior to the transmission of a request message to a content server, a user terminal transmits an enquiry message to the gatekeeping apparatus. In response, the gatekeeping apparatus makes a decision as to whether or not a content can be retrieved from the content server and performs control on the transmission of the request message according to the decision. If the decision indicates that a content can be retrieved, the user terminal transmits the request message to the content server. In a preferred embodiment, the gatekeeping apparatus makes comparison between user's preference data and server's policy data and determines whether the requested content can be retrieved from the server. A cache memory may be provided in the user terminal or gatekeeping apparatus to store past decisions regarding requested contents.

Content delivery system

A wireless communication system wherein if a terminal receives an address duplication detection packet that terminal compares the duplication detection address with the IP address of itself and if those addresses are similar, sends a duplication notification packet, however if those addresses are not similar, the terminal investigates whether or not the duplicated address is being held in an address coordination table. If the duplicated address is not being held in that table, the terminal makes a new registration of that address in the table while if that duplicated address is held in that table, the terminal compares the combination of that duplicated address and the sender physical identifier of the duplication detection packet with the combinations inside the coordination table. If those combinations are equivalent, the terminal resets an address coordination maintenance timer while if they are not equivalent, the terminal changes the reception settings of packet reception partto enable reception of packets each of which includes the duplication detection address and the sender physical identifier of the duplication inspection packet as the destination physical identifier, and starts up duplication notification packet wait-for-send timerhowever if timertimes out, a duplication notification packet is sent.

Method for resolving duplication of terminal identifiers in a wireless communication system

To achieve high throughput by using random reservation scheme, when traffic is heavy in multiple access communication system. Further, to suppress signal delay by using both random reservation scheme and random access scheme, when the traffic is low. Scheduling means holds a flag which indicates that there is no allocation of transmission bandwidth for a long packet reservation information stored in long packet reservation queue. The flag is checked, after the allocation of data transmission bandwidth is started. When the flags are set, bandwidths are allocated firstly for long packets, and secondly for short packets. On the other hand, when the flag is not set, bandwidths are allocated firstly for short packets, and secondly for long packets.

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Tokyo, Japan

Akira Uematsu