In this paper, an X-band power amplifier using GaAs FET was designed and fabricated, which is to be used as SART transmitter sweeping at the frequency range of 9.2 GHz~9.5 GHz. The amplifier is consist of two stages using ATF-46101 FET of Hewllett-Packard. Finally, the amplifier using microstrip line matching solution shows that MAG is 23 dB at the center frequency of 9.35 GHz.

A quick and automatic detection with no harm to the goods is very important task for improving quality control, process control and labour reduction. In real fields of industry, defect detection is mostly accomplished by skillful workers. A narrow band eliminating spatial filter having characteristics of removing the specified spatial frequency is developed by the author, and it is proved that the filter has an excellent ability for on-line and real time detection of surface defect. By the way,. this spatial filter shows a ripple phenominum in filtering characteristics. So, it is necessary to remove the ripple component for the improvement of filter gain, moreover efficiency of defect detection. The spatial filtering method has a remarkable feature which means that it is able to set up weighting function for its own sake, and which can to obtain the best signal relating to the purpose of the measurement. Hence, having an eye on such feature, theoretical analysis is carried out at first for optimal design of narrow band eliminating spatial filter, and secondly, on the basis of above results spatial filter is manufactured, and finally advanced effectiveness of spatial filter is evaluated experimentally.

In this paper, RF receiver for CDMA system which has 10 MHz in the channel bandwidth has been designed and fabricated. The designed and fabricated RF receiver is shown useful in operation and the performance has been confirmed by experiments. The results are to be used for establishment of a broadband CDMA wireless access specification standard for WLL system in 2.3 GHz band.

This paper described the method and the result of making a dynamic fiber optic gyrocompass measuring the heading angles of ships by processing the output signal from a constant rotating fiber optic sensor and also showed the measurement to test the performance of our system. Considerig an economical view we designed and ordered a cheap medium grade fiber densors increased not fiber length but the diameter of a fiber sensing loop. The scale factor and noise was 267mV/deg/s and 2 deg/hr/Hz(1Σ), respectively. We made the dynamic fiber optic gyrocompass by this sensor. We measured the heading angles in an arbitrary direction to evaluate the accuracy of our system and the root mean square error was 0.4˚. Moreover, we measured the angles ineach direction of 45˚. successive rotation to know whether this system has distoritions in a specific direction or not and the root mean square error in this case was 0.5˚.

This paper describe the method and the result of making a fiber optic gyrocompass measuring the heading angles of a ship with a fiber optic sensor. As the method seeking for the heading angles, it is possible to get the heading angles by measuring the output signals from a stationary fiber optic sensor in at least three directions such as a heading direction and other two directions having phase difference Φ1 and Φ2 to the heading. We made the static fiber optic gyrocompass by a high performance fiber optic sensor having scale factor of 210mV/deg/s and resolution of 0.5deg/hr using this principle. The accuracy of this system was 0.29˚ from 20 numbers of data measuring the arbitrary heading angle.

In this study, a vertical type LPE system has been developed for III-V semiconductor compounds single crystal growth. On the basis of the experience & basic study using this system, the system modification has been carried out for a ultra thin multi-layer single crystal. The temperature fluctuation was within ±0.006℃ at 800℃, temperature uniformity for graphite boat around was within ±0.15℃ at 650℃, and cooling rate was controllable from 2.2℃/min to 0.05℃/min. As a result it is considered to satisfy the condition to grow a ultra thin layer single crystal of III-V semiconductor compounds.

To convert the analog signal from the drying process into the digital signal, the interface circuit was designed and built. To measure the weight and temperature during drying process, strain gauge type load cell and temperature transducer composed of pt 100 thermometers and wheatstone bridge circuits were built and used. The temperature control device was composed of photocoupler and triac. Microcomputer aided experimental convective drying system was built with above cricuits and devices. Drying characteristics of onions can be estimated using this system.

An air suction skimmer was selected as a potable skimmer to be developed among the many reviewed skimmers because of its advantages such as simple structure, excellent transportability, and easy deployment. A prototype of the skimmer was fabricated. It was shown that the skimmer operated by a commercial vacuum cleaner has good performance. The maximum suction rate of water and the maximum suction head were 18㎥/㏊ and 2.7m, respectively.

This paper aims at creating the measurement of athletes` stress. About 340 athletes attending high schools or universities were selected as the subjects for the purpose of this study, but 316 of them were the real subjects for the ultimately operated data on the factors causing stress. Questionaires adapted from Competitive State Anxiety Inventory(CSAI) designed by Martens, Burton, Rivkin and Siman were used to put Competitive Anxiety Factor to the test ; questionaires included in Sports Cohesion Instrument (SCI) developed by Yukelson, Weinberg and Jackson were used to test Team Cohesion Factor ; questionaires presented in A Study on the Measurement of Job Stress (I) by Lee Jong-mok and Park.Han-ki were modified to be suitable for athletes and used to test communication factor and family factor. 54 questions were selected out of preliminary questionaires for testing the above -mentioned factors, and principal component factor was analyzed by means of Pearson correlation coefficient matrix on the basis of the responses to 54 questions. As a result, 12 factors and variable quantities that they could take turned out to be 60.20% . 47 questions, which had more than .30 as each factor loading in 12 factors, were selected out of 54. questions as a resultof Uarimax Rotated Factor Analysis of these 12 factors. The selected 12 factors game, counsel, sports-external disturbance, team cohesion, athletic sports, communication, training, spectators. We suggest that athletes undergo stress while they are under situations-competitive or ordinary-concerned with these 12 factors.