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縷緋製品의 Quilting type에 따른 保溫性에 관한 硏究
鄭夏仙,柳德桓 啓明大學校 生活科學硏究所 1991 科學論集 Vol.17 No.-
In general polyester is extremely used to increase the ratoi of the warmth heat resistance among quilting products as a padding, make polyester the object of this study and examine the thickness in terms of quilting type, air volume, air permeability, quilting interval, the ratio of the warmth heat resistance followed by the variation of no-flow, and flow case or after-washing and before-washing. In brief, the result is as follows; 1. In all quilting type, Clo value is found on increasing tendency with increase of thickness. And in non quilting samples, the more porosity grows up the more Clo value decreased. 2. In each quilting type comes in evidence a similar air permeability and it doesn't have an interrelationship with Clo value. 3. In each quilting type with much air volume. Clo value increases;in the same quilting type the more quilting interval increases the Clo value increases. 4. In each quilting type, Clo value is discovered an increasing tendency by 7.5cm;it is not discovered an increasing tendency above the ratio. But in flow case, Clo value doesn't change at all by 200cm/sec as in no-flow case and it is discovered a decreasing tendency above the ratio. 5. In flow case and no-flow case, the variation of the Clo value followed by the quilting type is identical. And Clo value increases in checker<spiral<righted-spiral<vertica quilting type by turns. 6. Clo value after-washing with quilting samples if sound a little more increased tendency than Clo value before-washing samples.
직접 대역확산 전송 방식을 이용한 무선 모뎀 프로세서의 설계
이정하,김일환 강원대학교 정보통신연구소 2004 정보통신논문지 Vol.8 No.-
This paper focuses on the design of a VHDL module of DS/SS-QPSK wireless modem processor for digital data communication. The spread spectrum method is used for modem processor as it guarantees good frequency efficiency and b h e r security. Also, it secures good performance in digital communication system under multi-path interferences. The designed transmitter consists of differential encoder. Ph' code generator, and QPSK modulator. The receiver consists of down converter, I'D filter, and matched filter. timing recovery caused by power detection, and differential decoder. The designed VHDL module of the wireless modem processor has data transmission rate of 312.5 Kbps using 20 MHz system clock. The performance is verified by simulation. The total number of gate for the modem processor is approximately 10,000using XC4000E FPGA of the Xilinx. By reducing the gate capacity, the designed processor has simple architecture and it is possible to implement one-chip VLSI more efficiently.
정신분열병환자의 혈소판막과 ³H-spiperone결합에 관한 연구
양병환,박응철,정하승 大韓神經精神醫學會 1989 신경정신의학 Vol.28 No.5
This research was to determine whether changes of dopamine receptors on the platelet membrane of schizophrenics could be used as a biological marker for schizophrenia. ³H-spiperone binding to platelet membranes was carried out in 22 schizophrenic patients who fulfilled DSM-ⅢR criteria and 14 age-matched control subjects. ³H-spiperone specifically binds to dopamine D2 receptor with high affinity. Increased Bmax can suggests increase in the number of dopamine receptors on the platelet membrane. The results are as follows ; 1) Bmax of the patient group was significantly higher than that of control group(p<.05). 2) Kd was not significantly different between the two groups. 3) Bmax of the positive and the negative symptom groups were significantly higher than the control group when the patient group was subdivided into the positive, the negative and the mixed symptom groups(p<0.5). 4) Kd of the positive symptom groups, the negative symptom groups and the control group were not significantly different among each other. 5) Bmax and Kd of the positive and the mixed and the negative symptom groups were not significantly different among each other. This results shows that increase in the number of depamine receptors on the platelet membrane of schizophrenics would be a part of disease process in schizophrenia.
STS304와 S15C 이종마찰압접부의 접합계면 응력해석
오정국,차용훈,성백섭,박창언,김하식,김충환 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.3
Friction welding has many merits such as energy efficiency, simple processing, etc. but it is difficult to obtain good welding at the welded interfaces and heat affected zone. It is discovered that stress singularity exists at the interfaces and heat affected zone. The computer program based on boundary element method is utilized in this study. A mathematical model is implemented based on results from several experiments performed at and around the welded interfaces and heat affected zone of disimilar metal under static and dynamic loadings. This study is to investigate the characteristics of the deformation and fracture behavior around interfaces for friction welded materials under static tensile load. Also, the stress distribution at the tip of crack is analyzed by using BEM based on Kelvin's solution of 2-dimensional binding zone. The results of BEM are identical with those in case of considering interfaces of both heat affected zone. Also, stress singularity at the tip of interfaces appears when the elastic modulus ration is 1.07.
정삼현,배정하,서승유,김규환,이동갑,하정호 東亞大學校 附設 스포츠科學硏究所 1997 스포츠科學硏究論文集 Vol.15 No.-
Among the school gymnastics facilities, perhaps the most common ones are gymnastics apparatus. That's why a historic study in the event of havy gymnastics is required. The researchers here have examined the origin of gymnastics with apparatus centered on Jahn's "turen" exercise. The results are as follows : 1. Heavy gymnastics originally contained a lot of elements from field and track events. It had aims of obtaining natural physical movement and enhancing work efficiency. 2. An outdoor event turnen was banned and changed into an inddor event. The fact that apparatus gymnastics is nowadays held indoors reveals the decisive influnece of Jahn's turnen exercise. 3. Jahn's balance beam exercise was at first played for the purpose of blancing oneself and merely for fun. It has developed into the present from through wide distribution and elaboration. 4. Jahn first used the term of parallel bars and the present women's event of parallel bars resembles Jahn's. 5. Jahn's horizontal bars have also had a great effect on today's event of horizontal bars.