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비열 플라즈마 처리를 이용한 polystyrene, 소시지 케이싱, 그리고 훈제연어에서의 식중독균 저해
이한빛(Hahn-Bit Lee),노영은(Young-Eun Noh),양희재(Hee-Jae Yang),민세철(Sea Cheol Min) 한국식품과학회 2011 한국식품과학회지 Vol.43 No.4
PS 필름에 접종된 S. Typhimurium, E. coli 0157:H7, L. monocytogenes를 저해시킬 때 헬륨을 사용한 플라즈마 처리의 경우에는 S. Typhimurium이,헬륨과 산소를 동시에 사용한 플라즈마 처리의 경우에는 L. monocytogenes가 가장 많이 저해되었다. E coli 0157:H7과 L. monocytogenes는 헬륨과 산소를 함께 사용하여 풀라즈마 처리하였을 때 헬륨만 사용하였을 때보다 더 큰 저해를 보였다. 헬륨과 산소를 함께 사용한 비열 폴라즈마 처리는 L. monocytogenes가 소시지 케이싱이나 훈제연어에 감염되었 을 때보다 PS 필름에 감염되었을 때 L. monocytogenes를 더 효과적으로 저해시켜 감염된 재료에 따라 다른 저해 효과를 보여 주었다. 비열 폴라즈마 처리에 사용된 가스의 종류와 미생물이 감염된 재료는 그 처리의 항균 효과에 대한 평가에서 중요하게 고려되어야 할 것이다. 헬륨과 산소를 사용한 비열 플라즈마 처리는 공정 후 포장재에 감염된 L. monocytogenes를 효과적으로 저해할 수 있을 것으로 기대된다. The effects of nonthermal plasma treatments against Salmonella Typhimurium, Escherichia coli 0157:H7, and Listeria monocytogenes living on polystyrene (PS), sausage casings, and smoked salmon were investigated. Inoculated PS, casings, and salmon were treated with nonthermal plasma generated with helium (5 L/min) or with both helium (5 L/min) and oxygen (100 mL/min) at 60 Hz and 30 kVxm for 2, 5, or 10 min. S. Typhimurium exhibited the highest sensitivity to the helium-used treatment. The greatest reduction (3.9±0.8 log CFU/㎠) was observed with L. monocytogenes on PS after the treatment with the mixed gas for 5 min. The treatment with the mixed gas inhibited L. monocytogenes on casings and salmon by 0.5±0.3 log CFU/cm: and 1.0±0.3 log CFU g, respectively. Different treatment times did not result in different reductions of L. monocytogenes on both casings and salmon. The types of treatment gas and material of contamination need to be considered for evaluating the antimicrobial effects of nonthermal plasma treatments.
볼트 접합된 반강접 보-기둥 죠인트에 대한 Component Method의 적용
양철민,김동환,김영문 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
Beam-to-column joint transfer reactions from the beam to the column. When subjected to shear forces and in-plane bending moment, they deform, particularly in rotation. In other words, the primary distortion of a steel beam-to-column joint is its rotational deformation (θ), caused by the in-plane bending moment (M). Therefore, the joint behavior is substantially represented through M-θ, which is the most important input data for the analysis and design of semi-rigid frames. The study of the M-θ behavior of steel beam-to-column joints has increased dramatically. Several approaches to create nonlinear M-θ curves for various connection types have been used. In fact, even though simplified methods have been already developed for evaluating the rotational behavior of connections with angles, these models refer only to the behavior of the connection rather than to the joint as a whole, excluding the significant influence of the column components. The case of bolted connections with angles becomes even more complex than others. In this paper, a mechanical model to predict their M-θ curve is presented. To achieve this goal, the component method described in Annex J of Eurocode 3 (CEN, 1997) is used. Also, in order to verify the reliability of the component method, experimental test on bolted semi-rigid beam-to-column connection was conducted.
반복하중을 받는 볼트 접합된 외부 보-기둥 접합부의 성능
양철민,김영문 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
This paper persents an experimental investigation on the cyclic behavior of steel assemblages with fixed, semi-rigid and flexible connections. The studies consisted of subjecting three connection assemblages to an increasing level of large cyclic rotations until failure occurred. The main objectives of the experimental studies were to directly compare performance of connections. The result of this study show that semi-rigid connection was developed about 38% of rigid connection for initial rotational stiffness, and simple connection about 4.3%. Also, the hysteretic energy dissipation capabilities of the connections were determined, and the mechanism of failure was identified. Test observations show that the stiffness of weld connection is not fully rigidity, whereas for angle connection, it is not ignorable.
강민아,김도균,최석철,양회생,배철성,윤혜원,심재철,하달봉 동국대학교 경주대학 1997 東國論集 Vol.16 No.1
Prenatal ultarsound represents an accurate and reliable method for the detection of intrauterine anomalies, especially urinary tract anomalies. Hydronephrosis is the most common congenital condition detected by prenatal ultrasound. Prenatal ultrasonographic diagnosis allows a good condition and therapeutic assessment of the patients prior to serious impairment of renal function so that in most cases the urological surgeon can opt for a parenchymal conserving procedure. The authors have experienced a case of congenital ureteropelvic obstruction with hydronephrosis diagnosed at 32 weeks of pregnancy and report our experience with a brief review of literature.
신봉철,하석재,강민형,권오양,조명우 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-
In recent, the CFRP(Carbon Fiber Reinforced Plastics) composite has been widely used because it has light-weight and high mechanical strength. Therefore, CFRP composite is applied to variable industrial areas such as aerospace, automobiles, sporting goods, ships and so on. Generally, CFRP composite has been used in the industrial field by mechanical cutting processes. In this research, the CFRP composite specimen are laminated by 64plies with orientation angles such as 0°, 45°, 90° and [0°/±45°/90°]4S. The results are analyzed with cutting force and cutting surface.
이산 환형 방식의 비구면 렌즈 연마 경로에서 체재 시간 계산 알고리듬
이호철,양민양 한국공작기계학회 2005 한국생산제조학회지 Vol.14 No.2
This paper describes a dwell time calculation algorithm for polishing tool path generation in the small tool polishing process of the axis-symmetrical lens. Generally dwell time control in the polishing machines means that small polishing tool stays for a dwell time at the specific surface position to get the expected polishing depth. Polishing depth distribution on an aspherical lens surface consists of the superposition of the local polishing depth at the each dwell position. Therefore, tool path generation needs each dwell time together with tool positioning data during the polishing tool movements on the aspherical lens surface. The linear algebraic equation of removal depth, removal matrix, and dwell time is formulated. Parametric effects such as the dwell grid interval are simulated to validate the dwell time calculation algorithm.
RFID를 이용한 u-Campus 기자재 관리 서비스 개발에 관한 연구
구영철,이양민,이재기 東亞大學校附設 情報技術硏究所 2005 情報技術硏究所論文誌 Vol.13 No.1
The advent of the era of ubiquitous computing is attempting to change toward u-Campus. u-Campus requires various ubiquitous computing and network technologies. In this paper, we propose a new facility management service that uses RFID system instead id bar code system. This system can provide the information of facilities by means of radio recognition in real-time, and can support the function of security by carrying in or carrying out management. Using the proposed service in this paper, we expect to able to reduce the manpower, the time, the cost as compared with the existing system.