• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 추계종합학술대회 논문집
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• pp.1071-1074
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• 1999

In this paper, we studied a computer based three dimensional implantation system of artificial hip joint. The system can be utilized for doctors to select a suitable artificial femur which is best-fit for the patient and to find out the optimal implanting position as well. We proposed a new numerical index to measure the fitness between the artificial hip joint and the patient's femur. The proposed fitness index accounts for the variance of the distance between the outer contours of artificial hip joint and the femur in addition to the conventional area comparison. A few simulation are run to show results of fitness measurement and compared to the conventional method.

• 전자공학회논문지B
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• 제32B권8호
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• pp.1119-1126
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• 1995

The construction of rule-base for a nonlinear time-varying system, becomes much more complicated because of model uncertainty and parameter variations. Furthemore, FLC does not have an ability of adjusting rule- base in responding to some sudden changes of control environments. To cope with these problems, an auto-tuning method of the fuzzy rule-base is required. In this paper, the GA-based Fuzzy-Neural control system combining Fuzzy-Neural control theory with the genetic algorithm(GA), which is known to be very effective in the optimization problem, will be proposed. The tuning of the proposed system is performed by two tuning processes(the course tuning process and the fine tuning/adaptive learning process). The effectiveness of the proposed control system will be demonstrated by computer simulations using a two degree of freedom robot manipulator.

• 전자공학회논문지B
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• 제31B권4호
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• pp.40-47
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• 1994

In this paper, Micro-Genetic algorithms($\mu$-GAs) is proposed on a minimum-time path planning for robot manipulator. which is a kind of optimization algorithm. The minimum-time path planning, which can allow the robot system to perform the demanded tasks with a minimum execution time, may be of consequence to improve the productivity. But most of the methods proposed till now suffers from a significant computation burden and can`t often find the optimaul values. One way to overcome such difficulties is to apply the Micro-Genetic Algorithms, which can allow to find the optimul values, to the minimum-time problem. This paper propose an approach for solving the minimum-time path planning by using Micro-Genetic Algorithms. The effectiveness of the proposed method is demonstrated using the 2 d.o.f plannar Robot manipulator.

• Journal of Ginseng Research
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• 제16권1호
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• pp.18-23
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• 1992

Central dopaminergic activity of standardized ginseng extract G115 was investigated in comparison with those induced by haloperidol in rats. The effects of G115 on the locomotor activity and, stereotyped behavior induced by apomorphine, which interacts directly with dopamine receptor were observed. Apomorphine(2 mg/kg) significantly decreased locomotor activity, whereas it showed a markdly increased incidence of stereotyped behavior. Standardized ginseng extract G115(100 mg/kg) and haloperidol(1 mg/kg) showed a significant decrease in locomotor activity but not induced stereotyped hehavior. Locomotor activity induced by apomorphine was markdly decreased by haloperidol(1 mg/kg), but that was significantly increased by standardized ginseng extract G115(50 mg/kg). Stereotyped behavior induced by apomorphine was completely supressed haloperidol(1 mg/kg), but was not changed by standardized ginseng extract G115. These results suggest that standardized ginseng extract G115 plays an important role in central dopaminergic activity, and haloperidol and standardized ginseng extract G115 seem to have a different action in behavior.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1999년도 제3회 압연심포지엄 논문집 압연기술의 미래개척 (Exploitation of Future Rolling Technologies)
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• pp.180-187
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• 1999

This document illustrates the relationship between the wire rod wrinkle defect and the roll caliber design. The wrinkle defect is caused by the incongruent rolling conditions of the roll caliber design, the roll adjustment, and the extracting temperature. In this document, we restrict the study scope to the roll caliber design's effect on wrinkle defect at the base of real condition of the No.2 Wire Rod mill, POSCO. There has been wrinkle defect problem in the No.2 Wire Rod Mill, POSCO for many years. The engineers of the wire rod mill have been making efforts to solve the problem. As one of the efforts, we take the samples of the wire rod in the each stands of the 2'nd wire rod mill and then analyze the samples. Through the analysis, we find out the problem of the roll caliber design. So, we suggest the roll caliber design method to be more effective to weaken the wrinkle defect.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 하계종합학술대회 논문집(1)
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• pp.417-420
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• 2001

In this paper, a transceiver using waveguide modules for 60 GHz band wireless LAN is implemented and analyzed. The characteristics of millimeter-wave transmitter are 0 dbm output power, 10.5 dB gain and 38 dBc spurious emition. The receiver's are 3.16 dB noise figure, 8.8 dB gain, -86dBm sensitivity. Maximum communication distance is more than loom. Intermediate frequency comply with IEEE 802.11b. The transfer of multimedia files is performed. The transceiver's data rate can vary with intermediate frequency bandwidth and the transceiver is designed more than 200 Mbps.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2003년도 종합학술발표회 논문집 Vol.13 No.1
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• pp.511-514
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• 2003

In this paper, describes the design of PIFA for PDA which has parasitic patch to expand the impedance bandwidth and miniaturization technique to consider the radiation pattern. To expand the impedance bandwidth, generated resonant frequency of parasitic patch is different from that of main patch. To miniaturize the physical dimension, using the folded edge and rectangular slot. The obtained impedance bandwidth is 9.4% ($2.29GHz{\sim}2.515GHz$) at VSWR${\leqq}$2 and antenna gain is 2dBi within the operating frequency.

• 한국환경보건학회지
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• 제16권1호
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• pp.45-53
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• 1990

To investigate the effect of cultural condition on the aflatoxin production of Aspergillus flayus ATCC 15517, mixed culture with Aspergillus niger, better kind of media and size of Cultural vessels were examined. YES medium was better than SLS medium for this study. Small scale test tube culture was showed the possibility to simply examine the growth, total acidity, pH and aflatoxin production during cultivation, and also could reduce the second contamination of aflatoxin B1 from large scale broth cultured. Especially ELISA method is simple, sensitive and specific and therefore well suited to small scale of test tube culture. Mixed culture significantly reduced the aflatoxin production of Aspergillus fiavus ATCC 15517 and showed almost 95% inhibition of that level during the incubtation.

• 대한한의학회지
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• 제22권4호
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• pp.171-176
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• 2001

The Stagnation Syndrome of Qi is the depressed and suppressed mental state caused by anxiety, unaccomplished desire, maintained thought, and emotional problems, resulting in a concomitant physiological somatic dysfunction. Although blood test, urine test, EKG, and gastric endoscopy showed normal finding. a patient complained of a group of symptoms, so we considered it as an unidentified clinical syndrome. This syndrome could be interpreted as the disconnection of Fire (Heart) and Water (Kidney) in Oriental medicine, and treated with the therapeutic method of 'Ascending Water-Descending Fire'. After the application of Gyogam-dan and Ganggi-tang for 18 days, symptoms and signs improved.

• 한국생물환경조절학회:학술대회논문집
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• 한국생물환경조절학회 2004년도 추계학술대회 논문집
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• pp.67-71
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• 2004