품종 및 성별에 따른 쇠고기의 지방산조성 비교

김대곤,성삼경,정근기,최창본 대구산업정보대학 1995 논문집 Vol.9 No.2

Dae Gon The study was conducted to investigate the effect of breed, sex on fatty acid compostition. Hanwoo and Holstein used, in the study were classified by sex. The results are summarized as follows ; Oleic acid and unsaturated fatty acids(UFA) percentages of total fatty acids in Hanwoo were higher than in Holstein, but palmitic acid and saturated fatty acids(SFA) were lower in Hanwoo. Oleic acid in steers of Hanwoo and Holstein tended to increase compared with bulls. Oleic acid in rib loin and top round were considerably higher in Hanwoo steers than in Holstein steers. In Hanwoosteers, oleic acid and UFA tended to increased while stearic acid and SFA decreased as marbling degree increased.

한우거세우의 도체 육질등급과 쇠고기 이화학적 성질과의 상관관계

김대곤,성삼경,정근기 대구산업정보대학 2000 논문집 Vol.14 No.2

The study was conducted to investigate the effect of castration on the carcass grade of Hanwoo reared under the same feed and feeding condition. The carcass grading scores were measured by the Korean carcass grading standards. The results were compared with respect to Hanwoo by sex. Hanwoo steers showed significantly higher marbling degree than Hanwoo bulls. In Hanwoo steers, moisture content was lower while crude fat was higher than in Hanwoo bulls. Water holding capacity and L value of rib loin were higher in steers than in bulls. Collagen content was higher in bulls than in steers. The degree of hardness and chewiness in steers were significantly lower than those in bulls. Moisture contents and cooking loss of water were decreased where crude fat contents and water holding capacity were increased as marbling degree increased.

燒却爐 洗淨集塵機의 排出水 處理

신대윤,홍완해,김형곤 조선대학교 환경공해연구소 1999 環境公害硏究 Vol.15 No.2

This study has some useful information about washout water from the small scale incinerator, installed in Chosun university. The results are as follows; 1. The concentration of SS has 65.2㎎/ℓ after being screened by micro strainer. 2. Alum(10% as Al_(2)O_(3) : 3㎖/ℓA-601P 4㎖/ℓ was added in pH 7.5 for coagulating screened washout water. The removal rate after carrying chemical coagulation turned out to be 85.8% in SS, 45.4% in CODMn, 64.5% in BOD with concentration 9.1㎎/ℓ ,93.5㎎/ℓ and 134.8㎎/ℓ respectively. Some heavy metals were also analysed and their removal efficiency was higher than expected as below : Pb, Zn, and Fe was determined as 0.76㎎/ℓ , l.06㎎/ℓ, 2.63㎎/ℓ with removal rate of 93.7%, 86.6% and 80.6% in each item, respectively. 3. The optimum HRT for sample which is mixed with coagulated washout water and screened sewage wastewater on HBC-briquet ash complicative media was 13.4hr. Mixed sample with different rate like 1 : 1(ratio of chemically coagulated water to sewage wastewater on a half and half bases) obtained from biomembrane reactor with 13.4hr retention time, was determined value as 35㎎/ℓ (38.6% removal rate), 28.3㎎/ℓ (81.3% removal rate) and 51.7㎎/ℓ (75.7% removal rate) with respect with SS, BOD and CODMn, respectively.

정전탐침을 이용한 ICP Plasma에서의 E-H mode변환에 관한 연구

김대철,김곤호 한양대학교 이학기술연구소 2001 이학기술연구지 Vol.3 No.-

Plasma potential using the Radio frequency is fluctuate as RF field. When there is Rf that is changed as the time-varying plasma potential. negative shift phenomena of floating potential that decreases as the increasing of induced RF Voltage is observed in I-V curve trace obtained by Langmuir probe. In this paper we investigate the changing of floating potential when the input power is changed from 50 to 800 W in N2 gas and Ar gas on ICP plasma. In case of N2 and Ar, we can investigate that the floating potential become fixed after negative shift phenomena in 500 W and 200 W. This result shows that there is no more fluctuation caused by electric field and the change of mode is expected. When we use the capacitive probe and the magnetic probe, the different tendencies are measured at the each positions of mode change. Thus the mode changes of ICP plasma can be measured from investigation of the changing of floating potential. RF(radio frequency)를 이용한 플라즈마의 공간 전위(plasma potential)는 인가되는 RF field에 따라 변동한다. 시간에 따라 공간 전위가 변동하는 RF가 존재할 때 정전탐침으로 얻은 전류-전압 곡선에서의 부유전위(floating potential)는 인가해준 RF 전압이 증가함에 따라 감소하는 부유전위의 negative shift하는 특성을 갖는다. 이와 같은 부유전위의 변동을 ICP 플라즈마에서 N_(2) 기체와 Ar 기체에서 입력 전력을 50에서 800 W까지 변화시켜가며 정전탐침을 이용하여 관찰한 결과 N_(2)의 경우 500 W Ar의 경우는 200 W에서 negative shift 현상을 보인 후 일정해지는 것을 관찰할 수 있었다. 이는 정전기장에 의한 변동이 더 이상 커지지 않음을 의미하며 plasma의 발생 특성의 변화를 예상할 수 있다. 이 결과는 Capacitive 탐침과 magnetic 탐침의 결과에서도 mode가 변환하는 지점에서 서로 다른 경향을 나타내었다. 따라서 부유전위 변동의 관찰만으로도 ICP 플라즈마에서의 mode 변환 여부를 알 수 있다.

알코올의존 환자에서 할로페리돌이 음주갈망에 미치는 영향

이대수,김명정,김성곤 大韓神經精神醫學會 1998 신경정신의학 Vol.37 No.1

할로페리돌이 음주갈망과 음주저항능력에 미치는 영향을 알아보기 위하여 본 연구를 실시하였다. 대상 환자는 남자 알코올 의존 환자 18명으로, 무작위로 9명씩 두 군으로 나누어 한 군에는 위약을, 또 한 군에는 할로페리돌을 1일 5mg을 14일간 투여하였다. 실험 1일과 14일에 음주갈망과 음주저항의 어려움을 각기 4차씩 측정하였다. 1차는 기초 음주갈망 및 음주저항의 어려움을 측정하고, 2차는 투약 후, 3차는 100% 알코올 0.4gm/체중kg의 음주 후 및 4차는 동량의 두번째 음주후에 각기 측정하였다. 결과는 아래와 같다. 1) 급성 약물 투여시, 위약군에서는 1차 및 2차 음주 후 음주갈망이 유의하게 상승하였으나, 할로페리돌군에서는 음주갈망에 변화가 없었다. 2) 장기 약물 투여시, 위약군과 할로페리돌군에서 다 같이 음주 후 음주갈망이 증가하였다. 3) 할로페리돌은 급성투여시에는 음주저항능력이 저하되지 않았으나, 장기 투여시에는 음주저항능력이 오히려 감소되었다. 이상의 결과에서 할로페리돌의 급성치료는 알코올 의존 환자의 음주갈망을 감소시켰으나, 그러한 급성효과는 장기치료로 지속되지 않고 감소 내지 소실됨을 관찰할 수 있었다. Objectives : This study was aimed at investigating the effect of haloperidol on alcohol craving in patients with alcohol dependence. Methods : Eighteen patients with alcohol dependence were divided randomly into two groups of nine patients each : one haloperidol group and the other, placebo group. The medication of each group was done for 14 days. Alcohol craving and difficulty in resisting drinking were measured on day 1 and day 14, each consisting of a series of four assessments. Assessment 0 was basal levels. Assessment 1 was made 3 hours after medication. Assessment 2 was made after alcohol intake in a dose of 0.4gm of 100% alcohol/kg body weight and assessment 3 was done after the second alcohol intake in the same amount. Results : The results were as follows : 1) With acute treatment, placebo group showed a significant increase in alcohol craving whereas haloperidol group did not show any change after the first and second alcohol intake. 2) With chronic treatment, both groups showed significant increase in the alcohol craving after alcohol intake. 3) Haloperidol did not increase difficulty in resisting drinking after acute treatment however, with chronic treatment, it resulted in a significant increase of the difficulty in resisting drinking. Conclusions : From these results, the authors suggest that an acute treatment of haloperidol lowers alcohol craving in patients with alcohol dependence, but the effect does not maintain itself with chronic treatment.

각형강관을 이용한 스틸콘크리트 단위벽체의 축내력에 관한 실험적 연구

김곤묵,홍석일,이대현,김호수 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

The steel house, one of new construction methods, has been mainly adapted to a lot of housing and developed in construction skill. But the disadvantage of steel house system is that the system is limited to small housing because it is composed of light gauge steel. Therefore, in order to solve it, this study presents the new system which is made of a carbon steel square for general structural purpose. The framed wall system which is presented in this study is composed of the steel stud members by using the carbon steel square and is reinforced by the horizontal members called runner. So, this system has more sufficient strength and axial load capacity than the steel house wall system. Besides, this system gives us the improved effects of the adiabatic and sound insulation by filling up the autoclaved lightweight concrete. Accordingly, this study evaluates on the axial capacity of unit wall of the system through the experimental study according to the experimental variable and analysis on the structural performance of the framed wall system using carbon steel square.

3-5㎜ 강판절단용 아크플라즈마 절단기 팁 개발

김대철,김곤호,박강석 漢陽大學校 工學技術硏究所 1999 工學技術論文集 Vol.8 No.1

3-5mm 강판 절단용 플라즈마 토치의 핵심 부품인 토치 팁의 개발을 위하여 기존의 전원부 및 토치 팁의 특성을 관찰하였다. 강판의 두께, 강판과 팁 사이의 간격 그리고, 유입 가스의 압력 변화에 따른 절단 속도를 측정하였다. 전산 모사를 통하여 가스 흐름에 대한 최적의 조건을 얻어 swirl number=2.5에서 최대 온도 분포를 갖음이 관찰되었다. 이 결과를 이용하여 Electrode를 가공하였으며 높은 온도를 가진 Plasma Jet의 분포를 얻을 수가 있었다. 또한 Nozzle의 모양을 V자 형태로 변화하여 Slag 형성이 최소한으로 발생하는 최적의 토치 팁을 개발하였다. In order to develop new torch tip, major component of the plasma torch for cutting steel plate with 3-5mm thickness, the characterization of power supply and torch tip was carried on the jutting speed with steel thickness, the distance between steel and tip, and inlet pressures. The optimum design condition of gas flow to provide the high temperature distribution in the torch, the swirling number 2.5, was obtained from the computer code (DC plasma torch) simulation. It was also observed that a new torch tip manufactured with the of optimum conditions, swirling number=2.5, and V-shaped nozzle formed less slag after the cutting process.

치아 수복용 불소함유 glass filler의 제조 및 특성

김대성,최세영,김경남,김광만,김중곤 대한치과기재학회 1998 대한치과재료학회지 Vol.25 No.3

The purpose of this study was the reaching test of restorative glass according to composition. Mixtures of SrF₂, CaF₂and SiO₂were fused in platinum crucible. The glasses were ground and fraction which passed through a 400 mesh (38㎛) sieve were collected. The powder specimens were analyzed by a DTA and XRD. Then powder specimen were inserted to D. I. water with various of dissolution time and composition at 37℃. Fluoride ion, cation release, solubility, and pH change were estimated. It was clear that the glasses were formed except S0.65. In S0.40, Tg, Ts, and Tc were 630, 672, and 813℃ respectively. In initial 0.5 hrs., amounts of released fluoride ion and cation were about 90% of total released amounts and released rate was decreased with dissolution time. Amount of released fluoride ion and cation were increased with decreasing SiO₂ in glass filler. And released rate was decreased rapidly by adding CaF₂. This was caused by structural variation in glass filler. Solubility was similar tendency with ion released. The pH of D.I. water was 4.5. But in intial 0.5 hrs., pH was 8.2∼9.8., and decreased according to dissolution time. This is caused by ionic changing with cation and H* ion.

한국 무에타이의 도입과 발전방안 모색

김대곤 龍仁大學校 武道硏究所 2011 武道硏究所誌 Vol.22 No.1

이 연구는 국내 무에타이의 도입과 발전에 관한 연구로서 국내 초기에 도입된 무에타이의 경로를 문헌, 자료 및 인터뷰 등을 수집하여 연구하였다. 이를 기초로 한국 무에타이의 구조적 개선점을 다양한 각도, 즉 지도자 양성, 체육관 시설 및 교육 프로그램 등의 측면에서 분석, 고찰함으로써 무에타이의 발전에 도모하는데 있다. 이 연구를 통하여 다음과 같은 결론을 도출하였다. 첫째, 체육관 시설의 개선이다. 질 좋은 서비스와 교육을 제공하는 좋은 환경 제공으로 시작하여 각 지역에 무에타이를 알리고 가르칠 수 있는 체육관의 시설 개선이 시급하다. 둘째, 교육 프로그램의 다양한 개선이 필요하다. 다양한 신체 부위를 이용하여 운동하는 무에타이는 다양한 신체 활용만큼 각 기술 하나마다 요구되는 기술적 숙련도 또한 필요하므로 체육관 자체에서 개발한 여러 프로그램들을 다양하게 시도하는 것도 중요하다. 셋째, 훌륭한 선수 육성과 더불어 한 층 더 발전된 지도자 양성이다. 협회와 단체에서 우수한 선수들의 해외 연수를 비롯하여 무에타이 강국과의 기술 교류 등의 구체적 방안이 제시되어야 할 것이다. 넷째, 공정한 심판을 위한 정기적 교육과 정확한 판정을 들 수 있다. 심판에게 지역적인 지연 혹은 학연 등으로 인해 개인의 감정 등이 포함 되게 되면 객관성이 결여될 수 있다. 그 결과 심판의 오심으로 경기에 임하는 선수에게 더욱 큰 실망감을 안겨 줄 수 있기 때문에 더더욱 심판의 공정한 판정은 중요시 된다. 이러한 공정한 판정을 위해 반복적이고 지속적인 심판 교육이 필요하다.

메탄과 에탄의 흡착평형에 대한 활성탄의 기공 크기 분포의 영향

김대규,금경호,서양곤 경상대학교 환경보전연구소 2000 環境保全硏究所報 Vol.8 No.-

The adsorption equilibria of methane and ethane in a slit pore model of activated carbon were studied by using Monte Carlo method. In potential caculation. the fluid-fluid interactions are described using the "12-6" Lennard-Jones potential function. and fluid-pore surface interactions are described using the "10-4-3" potential function proposed by Steele. It showed that the pore size distributions effected isotherms from the simulation results in pure component adsorption of methane and ethane at 1∼30 bar pressure. Also adsorbed moleculars could identified occuping location and density from density profiles and snapshots.