Hitachi, Ltd.

Renesas Technology Corp.

Sadaki Nakano

Osamu Nishii

Takanobu Tsunoda

Tetsuya Yamada

Kei Suzuki

Yasushi Goto

Shunzo Yamashita

Keiro Muro

Toshiyuki Aritsuka

Koichi Yokosawa

Tomoichi Hayashi

Masayuki Miyazaki

Shinji Fujiwara

Norio Nakagawa

Disclosed is a computer system provided with a plurality of sensors provided in a plurality of devices to observe a predetermined amount, and a server for examining the physical amount transmitted from the sensors, wherein the plurality of devices are classified into a first device group and a plurality of second device groups, a plurality of second examination rules indicating the examination methods of the physical amount are set in the plurality of second device groups, the server calculates the similarity between the first device group and each of the second device groups, and, on the basis of the calculated similarity, a first examination rule to be set in the first device group is extracted from the plurality of second examination rules set in the plurality of second device groups.

Computer system and rule generation method

In a system manages a plurality of pieces of sensor information in a plant, or the like, it can be reducing an amount of data stored in a database and easily a processing for searching a place of an anomaly and an anomaly cause. A database management method for use in a computer for managing a database, the database management method including: a step of analyzing a query; a step of generating a first inquiry for searching the database for compressed data; a step of generating a second inquiry for executing a search of time-series data; a step of extracting given data from the obtained time-series data, based on a response result of the second inquiry; and a step of generating an output result by extracting data to be output to a client computer from the given data.

Database management method, computer, sensor network system and time-series data management method

In a hydrogen gas station where a great number of sensors are installed, in case hydrogen leakage occurs, sensors in the vicinity of the leakage location start to transmit a warning to an access point all at once. This causes channel capacity saturation and failure to transmit a warning to the access point. Nodes and the access point are connected to each other by an uplink channel and a downlink channel. The access point detects congested/uncongested status of the uplink channel by using a wireless transmitter module and notifies the nodes of the congested/uncongested status of the channel by means for transmitting onto the downlink channel. Meanwhile, each node controls its transmission operation, according to the hydrogen concentration level detected by its hydrogen sensor and the uplink channel congested/uncongested status notified from the access point. In this way, channel overflow due to access congestion in case of hydrogen leakage can be prevented.

Wireless terminal with gas leakage detection function, gas leakage detection system using the same, and gas leakage notification method

A gas detection system capable of suppressing the power consumption of the system using gas sensors required for heating for measurement at high accuracy, comprising a server and a plurality of gas sensors connected by way of wireless communication with the server, in which each of the gas sensors is provided with a heater, a controller for controlling the ON-OFF for the power supply to the heater and a comparator for comparing the detected gas concentration with a predetermined threshold value. In the gas detection system, electric power is not usually supplied to the heater in each of the gas sensors and the gas sensor measures the gas concentration at a low accuracy and always compares it with the threshold value. In a case where the gas concentration exceeds the threshold value in one of the gas sensors, it turns the heater of its own to ON thereby switching the measurement to that at high accuracy and turns the heater to OFF upon completing the measurement. At the same time, it informs the detection for the excess of threshold value to the server and the server lowers the threshold value of the gas sensors in the vicinity of the gas sensor that has informed the detection for the excess of threshold value to make the monitoring level severer.

Gas detection system

A semiconductor device is employable for a compact and light-weight sensor system that is free of the need for battery replacement. The semiconductor device has a sensor chip (SCHIP) comprising sensors (TD, AS, PD, GS), an A/D conversion circuit (AD), a microprocessor (CPU), a memory (MEM), a transmission circuit (RF), and a power generation circuit (CM). The sensors, the A/D conversion circuit, the microprocessor, the memory, and the transmission circuit are formed on one side (SIDE) of a substrate, while the power generation unit is formed on the other side (SIDE) of the substrate.

Semiconductor device for sensor system

A microprocessor includes a first cache memory, a first instruction fetch unit, a first instruction decoder, a first processing unit and a first latch that holds a control signal outputted from the first instruction decoder. When the first instruction fetch unit receives a first instruction performed by the first processing unit it outputs the first instruction to the first instruction decoder. When the first instruction fetch unit receives a second instruction which is not performed by the first processing unit, it outputs a specific instruction to the first instruction decoder, after which the supply of clock pulses to other latch circuits In the first processing unit is halted based on the control signal.

Halting clock signals to input and result latches in processing path upon fetching of instruction not supported

A low cost system and method are provided for long-term monitoring of the quality of a building structure utilizing a semiconductor integrated circuit device buried in the structure. A monitoring chip includes a sensor, a microprocessor, a memory, a radio interface, an electric power controller and an electric power generator. The monitoring chip intermittently receives power to intermittently monitor information such as whether concrete is adequately cured, whether the quantity of moisture and chloride ions in concrete paste is adequate, or whether a state of stress inside concrete is in question. Temperature sensors, electric resistance sensors and pressure sensors respectively built in the monitoring chip use the built-in electric power generator as a power source, and the system store any abnormal measured values in a built-in memory. Collected quality data is transmitted according to an external request to indicate building structure quality.

Quality monitoring system for building structure, quality monitoring method for building structure and semiconductor integrated circuit device

A microprocessor to reduce wasteful power consumption of the floating-point unit. An instruction invalidation logic circuit is utilized to substitute the instruction not-to-use-the-floating-point unit, in the instruction string supplied from the instruction cache, with an invalidating instruction, hold that invalidating instruction in the floating-point register, and supply that invalidating instruction to a floating-point decoder in the floating-point unit. In cases when the invalidating instruction was continuous, the power consumption in the floating-point data path as well as the in the floating-point decoder and floating-point register is reduced.

Substituting specified instruction with NOP to functional unit and halting clock pulses to data latches for power saving

The data processor includes a CPU and an instruction prefetch buffer that prefetches an instruction executed by the CPU and stores it therein. The CPU contains a detection circuit for detecting whether or not a displacement from a branch instruction to a branch target instruction is a specific displacement on the basis of branch displacement information that the concerned branch instruction holds. The instruction prefetch buffer clears an instruction already prefetched when the detection circuit detects that the displacement is not the specific displacement and outputs a branch target instruction newly fetched to the CPU, and outputs a branch target instruction already prefetched to the CPU when the detection circuit detects that the displacement is the specific displacement. Thus, the date processor fetches a branch target instruction within a certain range from the instruction prefetch buffer at a high speed without adding the nullifying bit on the instruction code.

Growing community of inventors

Kokubunji, Japan

Sadaki Nakano