When cylindrical workpiece is processing, it is held in place by what is called a “chuck”. If a thin workpiece is being used the chuck, may cause the workpiece to be deformed. The deformation amount is very small so unnoticeable by the naked eye. We took a picture of the image before and after the deformation by CCD (Charge Coupled Device) camera, and examined a method of calculating the amount of the deformation from the images. The experiment result showed that we could detect errors smaller than one pixel. The next step will be to gain a high contrast image and highly accurate detection method.

View full abstract

The use of 3DCG is now common in movies and videogames. 3D modeling software is needed to create this 3DCG. However, the operation of 3D modeling software is difficult for the beginner. Therefore, a system that uses ARToolKit was designed. When ARToolkit is used, it becomes possible to synthesize 3D CG on an image taken with a Web camera. The system that designs it can take a picture of user's finger, and 3DCG synthesized on the screen can be operated. As a result, work can be done while appropriately imaging three dimension a space.

View full abstract

Recently, the protection of personal information has been emphasized. Especially, highly confidential Conversations (important conferences, individual calls to institution such as banks where personal information is discussed, etc...), privasy becomes more important. This study tries conversation protection giving the noise making conversational content less likely to be heard by third parties. This noise is called “jamming noise”. In this study, it is purpose to make this jamming noise and research the effectiveness of it. This jamming noise is made to reflect frequency spectrum of conversational voice getting by Discrete Cosine Transform in white noise. 20 examinees listened to sound data that combined voice data, and white noise and sound data that combined voice data and jamming noise. In the outcome of the experiment, 81.7% of the conversational content was able to be heard in sound data that combined voice data and white noise and 21.9% of the conversational content was able to be heard in sound data that combined voice data and jamming noise.

View full abstract

A wireless monitoring system for indoor environments was developed. The system was composed of a 1-chip microcomputer board (Arduino) and several sensors (a temperature sensor, a humidity sensor, a gas sensor and a color sensor). After the detected information with these sensors was processed by the microcomputer using the wireless system (XBee) which was mesh-networked, it was imported to the database system. The modified informa tion data (XML) was uploaded to the web system. We can access to the computer network at any time and everywhere and easily get the visualized records of the condition of the monitored environment. This system can be used for safety and disaster prevention.

View full abstract

This paper describes a system for record and analysis of neural pulse sequences using a personal computer. Neural pulse waveforms are digitized by an AD converter and recorded on hard disk, simultaneously displaying waveforms on the monitor. Real-time counting of neural pulse number is also executed per five seconds, and the changes of pulse number with the course of time are displayed. It is possible to repeat neural pulse counting after recording while changing the conditions for detection. The system performance was confirmed by recording and analyzing some waveforms from a signal generator. The analyses of neural pulse sequences of rats influenced by injection of medicinal substances were also shown.

View full abstract

A recorder consists essentially of an ECG (Electrocardiogram) amplifier, a LCD (Liquid Crystal Display), a SD (Secure Digital) memory card and a PIC (Peripheral Interface Controller). ECG waveforms induced from a human body are amplified and digitized by built-in AD (Analog-to-digital) converter in a PIC. Waveform data is simultaneously recorded on a SD Card and displayed on a LCD. These functions are controlled by a PIC. Basic electrical characteristics of a recorder were measured in this experiment. The continuous 12-bit AD conversion of sampling frequency of up to 500 Hz was available. A recorder operating at system clock frequency of 10 MHz consumed an electric current of 19 mA and can be continuously recording for about 100 hours using alkaline AAA batteries.

View full abstract

We have developed a system that detects students who raise their hands holding an iPod touch. The system can display the students' responses on the seating chart. To maintain the attention of students during class, it is known that frequent interaction between teacher and students is effective. It is expected that the system maintains students' attention, and a teacher can know the understanding level of each student on a real time basis. Having used the system, 65.1% of the 43 students answered that it was easier to tell the teacher their understanding level than usual. 60.5% of them answered that they concentrated on the class more tham usual,

View full abstract

The assembly of a germanium radio was introduced to raise the interest level during a practical exercise. After the resonance circuit using the passive elements (the condenser and the coil) was studied, the germanium radio was assembled. When electromagnetic waves were emitted from the AM transmitter,which was used as the relay site of the broadcast station, they were able to be received on the germanium radio with the tuning circuit (or the resonance circuit). The students got interested and understood the principles of the reception mechanism of the radio. A sequence of the experiments was found to be available for the practical experiences from a questionnaire after the exercise. In addition, a germanium radio assembly seminar for the elementary school student was held as regional activity support, we got a favorable notice from the participants.

View full abstract

[in Japanese]

View full abstract

[in Japanese]

View full abstract