PROBLEM TO BE SOLVED: To provide a passage abnormality detection device which is not affected by the weather condition such as the change of atmospheric temperature, snow, rain, etc. SOLUTION: This passage abnormality detection device is composed of an interrogator A arranged so as to send a question signal to the entire watching area of a road, plural transponders B1-Bn buried on the road surface of the watching area at a prescribed interval and a control device C for controlling the sending/receiving of the interrogator A and also for judging the passage abnormality based on the response signal from the transponder. A previously alloted interrogator identifying number is included in the question signal sent by the interrogator and a previously alloted transponder identifying number is included in the response signal sent to the interrogator, by transponders B1-Bn.

Passage abnormality detection device

Long-hole blasting method in tunnel excavation

PURPOSE:To prevent a three-dimensional image from being damaged even at the time of reproduction at = the prescribed sound pressure, and controlling the degree of the crosstalk according to sound volume when the sound pressure is set at = the prescribed sound volume, whose resistance values are reduced when the sound volume is regulated lower than the prescribed value, and which are regulated so that the crosstalk of right and left signals may be larger, are connected to the sound volume regulators 3 and 3'. Consequently, a listener feels that the image is normally positioned at the center of both speakers 6 and 6'. Thus, the three-dimensional image is not damaged even if it is reproduced at <= the prescribed sound volume.

Stereo reproducing device

The present invention relates to an apparatus for controlling traffic flow, which can change a traffic signal time according to the number of vehicles stopping at the road. According to an embodiment of the present invention, the apparatus for controlling traffic low comprises a plurality of vehicle recognizing modules which are buried in a three-way intersection comprising a main road and arterial roads and recognize the number of vehicles waiting in each entry direction of the intersection; a traffic signal time adjusting module which changes a traffic signal time based on vehicle recognition information of the vehicle recognition modules buried in each road of the three-way intersection; and a traffic signal controlling module which controls the intersection′s traffic signal in accordance with the traffic signal time changed by the traffic signal time adjusting module. The vehicle recognizing module recognizes whether a vehicle, located on the road, stops by using a density of magnetic field lines of a magnetic field, senses a density change amount of magnetic field lines for a predetermined time, and provides vehicle recognizing information of recognizing that the vehicle stops at the road to the vehicle signal time adjusting module through a wireless local area network (WLAN) when the sensed density change amount is maintained for a predetermined time. The traffic signal controlling module controls a traffic signal of the main road to be a straight signal when there are no vehicles entering from the arterial roads.

Apparatus and method for controlling traffic flow

Stop state sensor for moving object

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Stop state sensor for moving object

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Passage abnormality detection device

Long-hole blasting method in tunnel excavation

Stereo reproducing device

Apparatus and method for controlling traffic flow