UHF 대역의 휴대전화 착신기능 제한 시스템의 설계 및 제작

남효덕,김종석,김병철 嶺南大學校 工業技術硏究所 2001 工業技術硏究所論文集 Vol.29 No.2

As demands grow for restricting use of cellular phones by attendants in the public places such as conference rooms, churches, and playhouses etc., a call blocking system against UHF band cellular signals is developed for other attendants who do not want to be disturbed by the phone rings. The idea of preventing a cellular phone from ringing was developed from the fact that the system radiates interferent signals having 0.1 to 0.05 watts of CW wave, makes it possible to increase the error rates of output signal of PSK modem, and hence makes the cellular phone Impossible to receive the right call signal. The system designed in this study was set up and tested in the several public places and found itself very effective.

중격측좌핵 및 선조체기저핵의 아미노산 함량에 대한 한쪽 뇌 해마 제거의 영향

남준철,김종규 순천향의학연구소 1996 Journal of Soonchunhyang Medical Science Vol.2 No.2

We analyzed the amino acid contents of fundus striatal and accumbens septal tissue in unilateral hippocampectomized rats by high performance liquid chromatography(HPLC). Thirty-one male rats were divided into hippocampal, cortical control and normal control groups. After a survival period of 7 days, the animals were sacrificed by decapitation. Two to three milligrams of tissue were removed from the nucleus fundus striati and the nucleus accumbens septi in ipsilateral or contralateral side of the brain. In the nucleus accumbens septi, the contents of glutamate were reduced significantly in the ipsilateral hippocampal group and increased significantly in the contralateral hippocampal group than in the normal control group and the cortical control group, while there were no significant differences between the 2 control groups. The contents of glycine were reduced significantly in the contralateral hippocampal group than in the normal control group and the cortical control group. But in the nucleus fundus striati, the difference of contents of all amino acids were nonsignificant. From the above results it is suggested that the ipsilateral hippocampus may exert a direct effect on the accumbens septi than the contralateral hippocampus.

WIND ENERGY POTENTIAL ASSESMENT and SITING a WIND FARM in CHEJU ISLAND

고경남,김건훈,조경호,고장권,허종철 濟州大學校 産業技術硏究所 1997 산업기술연구소논문집 Vol.8 No.2

The possibility in the practical use and supply of the wind turbine in Cheju island was investigated. The wind data measured in three regions which have a plenty wind energy potential were utilized to quantify the wind power resources by statistical analysis. Power output was calculated for 600 kW wind turbine. The coastal area of Guja was superior to Daejung and Hoichun in wind power energy densities. The calculated capacity factor of 600 kW wind turbine in this site was high as much as 30%. Hoichun site. the intermediate region between the Halla mountain and the sea. was rich in wind power energy resources in winter. Hourly ideal energy density at three regions increased at sunrise, reached the maximum a t 13-16 O'clock, decreased steadily, and finally remained constant at sunset.

분위기 압력이 디젤분무특성에 미치는 영향

허종철,고경남 濟州大學校 産業技術硏究所 1996 산업기술연구소논문집 Vol.7 No.1

An experimental study has been carried out to investigate the influences of injection pressure and ambient pressure on diesel spray. Especially, diesel sprays were visualized by means of double flash. The visualized spray volumes at the ambient pressure of 3MPa increase more steeply with respect to the elapsed injection time than the atomospheric pressure. The spray tip penetration is increased according to higher injection pressure and lower ambient pressure. When the ambient pressure is further increased, the transition of the spray tip penetration occurs earlier. And the spray tip velocity increases with higher injection pressure but decreases with higher ambient pressure. The spray cone angle does not vary with increasing injection time, but it depends significantly on the ambient pressure.

3성분계 콘크리트의 압축강도와 등가재령 관계에 관한 실험적 연구

나철성,윤종기,장종호,길배수,남재현,김무한 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

Activation energy has different value according to cement, admixture and water-cement ratio. Also the relation of age-temperature is as non-linear as activation energy value is large. Therefore to make accurate explanation for the effect of temperature on concrete strength development properties, it is necessary for activation energy value to explain in the maturity function. This study compares and estimates equivalent age used activation energy value that obtained by this experiment and Freiesleben activation energy value with compressive strength of concrete. As the result of this study, activation energy value obtained by this study has more accurate explanation temperature's influence about concrete strength development than Freiesleben activation energy value.

분단연습과 무선연습이 아동들의 운동학습에 미치는 영향

박종태,표내숙,한남익,박철용 釜山大學校 附設 體育科學硏究所 1997 體育科學硏究所 論文集 Vol.13 No.-

The purpose of this study was to analyze contextual interference in acquisition and retention of motor skill of children(9.2 year) by computer software(Charles H. Shea, 1993). Subject performed 54 trial with blocked practice and random practice in acquisition performance phase. Retention performance phase was measured after a 5-min and a day in random practice. The results are as follows : 1. In the acquisition performance phase, blocked practice condition had faster RT than random praction condition. 2. In retention performance phase, blocked practice condition and random practice condition revealed no significant difference.

무도계열 전공자들의 진로 개선 방안연구

김상철,이남주,윤종대 龍仁大學校 體育科學硏究所 1998 體育科學硏究論叢 Vol.8 No.1

The purpose of this study was to suggest the ideal direction in job opportunities by identifying the relationships among the personal charateristics, type of sports and his/her expectations toward job. The subject of this study consists of 320 students who were enrolled as Martial Art major in Y university located Kyunggido area in Korea. The instrument used in this study was modified from the guestionnaires which was administered by Jung-Ha Kim(1995) and mainly concerned on the items of job expectations. The title of the survey was "Questionnaires of Job Expectation of the students with Martial Art Major." the reliability of this survey was examined by Cronbach's α(α = .89). The PC-SAS was used to analyze the achieved data for this study. In conclusion, the review and development of curriculum are suggested to enhance with martial art major. The results of this study were shown as follow: First, the curriculum which focused on the professional Knowledge beyond martial art area is needed. Second, the professional classes related to martial arts should be offered. Third, the curriculum for teachers' background such as teachers education and instructors education is recommended.

연질폴리우레탄폼의 물리적 성질 및 흡음율에 관한 연구

정종원,박남국,박선정,박종래,김영철 全南大學校 觸媒硏究所 1997 觸媒硏究 論文集 Vol.19 No.-

The effects of polyols, isocyanates. surfactants and water on the physical properties of the polyurethane foam were investigated. The resin used in this study was prepared from a variety of polyol mixtures by adding catalyst, surfactant and cross-linker. The polyurethane was foamed from the resin by adding an equivalent amount of isocyanate and was used in property measurements. The physical properties were more affected by the type of isocyanates and the amount of water than the sound absorption coefficient. The sound absorption coefficient of the polyurethane foam was superior for the polyol mixture of KE-810(40%)FA-733(40%)/FA-703(20%). The sound absorption coefficient was increased with the amount of surfactant L-5309 up to 3000Hz, but was decreased above that frequency.

TiAIN 코팅공구를 사용한 Ti-6Al-4V 티타늄합급의 절삭특성에 관한 연구

이승철,박종남,조규재 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-

The Titanium has many superior characteristics Which are specific strength, heat resistance, corrosion resistance, organism compatibility, non-magnetic and etc. and their quantity are abundant.this study performed turning operation of Ti-6AI-4V alloy using the TiAIN Coate Tool which treated PVD (Physical Vapor Deposition). Experimental works are also executed to measure cutting force, chip figuration and surface roughness for different cutting conditions. As a result of study. Tool wear was serious at over 100m/min of cutting speed and cutting condition was excellent at 1.0㎜ of cutting depth.

디젤분무의 분무특성에 관한 실험적 연구

고경남,허종철 濟州大學校 工科大學 産業技術硏究所 1997 尖端技術硏究所論文集 Vol.8 No.2

This experimental study has been conducted to investigate spray mechanism of diesel spray under the parameters of injection pressure and ambient pressure. Also this study provides the information on effect of sac chamber. The results obtained in this study are as follows ; The higher ambient pressure, the shorter length of the ligaments and atomization is happened droplet from ligament rapidly. The fuel which remain in sac chamber and orifice becomes projected liquid column of spray tip at initial stage, this is atomized by overtaking of spray tip for time elapsed.