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하영아,김설화,김선영,권나희,제희정,임착한,김경희,김민근,류재산 한국버섯학회 2012 버섯 Vol.16 No.2
우리나라의 버섯 품목별 생산가액은 7,500억원 정도이며 안정적인 수준으로 유지되고 있다. 가장 생산가액이 많은 품목은 표고버섯으로 2,000억원에 달한다. 수출현황을 살펴보면 팽이, 새송이를 위시한 농산버섯이 376억원, 표고버섯, 송이버섯을 비롯한 임산 버섯이 110억원 가량 된다. 2000년대 들어 병버섯업을 중심으로 구조조정이 시작되어 농장들이 대규모화 대형화되었다. 국내의 버섯소비시장이 정체기를 보이자 이들 농가는 가격경쟁력을 바탕으로 새로운 수요를 창출하기 위하여 2000년대말부터 버섯수출이 시작되었는데, 팽이(수출액: 242억)와 새송이(수출액: 109억)가 주를 이루고 있다. 해외수출이 지속적으로 증가추세를 유지하고 있지만, 해외 수출버섯의 소비저변이 확대되지 않고, 긴 수송기간에 의해 신선도가 떨어지는 문제가 발생하여 수출액의 증가세를 가로막고 있는 실정이다. 농가별로 각기 다른 버섯재배방법을 사용하여 생산된 버섯의 저장성이 동일하지 않아 장거리시장 수출에 장애요인이다. 저장성이 강화된 새송이버섯 배지를 개발하고자 먼저 우수한 농장의 버섯배지 조성을 조사하고, 이를 바탕으로 성분중심으로 버섯배지원료별로 혼합비를 설정하여 버섯저장성에 미치는 영향을 조사하였다. 17개의 배지조합으로 버섯을 생산하여 생육특성을 조사하고 5℃저장시 저장일수를 기록하였다. 저장성조사결과 배지16과 17은 38, 35일로 기존의 23일에 비해 15일 18일 연장되었다.
능동형 엔진 마운팅 시스템 성능 평가를 위한 6축 시뮬레이터 구축
김정훈(Jeong-Hoon Kim),김재산(Jae-San Kim),이한동(Handong-Lee),박태익(Tae-Ik Park) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.4
As worldwide concern stands on global warming and greenhouse gases from internal combustion engine, the interests in technologies for a highly efficient powertrain has been increased. Concurrently the investigation to improve the deteriorated NVH, a by-product of energy efficient powertrain, is conducted seriously. The NVH performance of a new type of active engine mount that offers increased advantages over a passive hydraulic mount is examined using a newly developed 6-DOF simulator. The simulator is in the shape of Hexapod Stewart Platform adopting LEMA, a new type of actuator which is patented and commercialized by ACT Inc,, the world wide leader in the design, development, and manufacture of high performance linear electro-magnetic actuators for active vibration control. The target vibration signals of an aimed vehicle at four engine mounts are measured and simulated by 6-DOF simulator at the laboratory. The resulting NVH performances of the new active mounting system at a vehicle and on a simulator are examined and compared. Even though the active mount performance of lab test demonstrates less effective than the result of a real vehicle test, vibration reduction is identified through the simulator.
능동 진동 제어 시스템 성능 및 신뢰성 개발을 위한 6축 시뮬레이터 구축
김정훈(Jeong-Hoon Kim),김재산(Jae-San Kim),심재호(Jae-Ho Shim),박태익(Tae-Ik Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Recently, the interest in technologies for a highly efficient powertrain, i.e. a variable displacement engine or a light weight car body, to improve the fuel efficiency of automobile saving the environment has been increased. However this trend deteriorates NVH performance of a vehicle and the use of a conventional engine mounting system becomes unsatisfactory. In order to solve this dilemma, an active engine mounting system that could isolate or cancel out vibrations occurred at the powertrain was suggested. Not only an actuator with electronically controlled unit but also a successful control algorithm is essential for the development of the active engine mounting system. In many cases, the development of a control algorithm involves many trial and errors and the test with a real vehicle has its own inherent difficulties and risks. In order to minimize the research time and effort considerably, the development of a practical simulator may be necessary consequence. In this paper, the performance test and the reliability verification of an active engine mounting system with a control algorithm are examined with a newly developed 6-DOF simulator. The simulator is in the form of Hexapod Stewart Platform, where newly developed LEMA (Linear Electro-Magnetic Actuator) are applied as driving actuators. Effectiveness of the simulator is verified by using an active engine mounting system in the form of active linear vibration absorber. Firstly, we measured the target signal such as vibrations and RLD of an aimed vehicle at the proving ground. Then, the target signal is compared with the reproduced signal to examine reproducibility of 6-DOF simulator. Finally the controlled signal level at an aimed vehicle with an active engine mounting system is then compared with the level at 6-DOF simulator. Based on the two tests results, it is concluded that the adoption of 6-DOF simulator for the development of an active engine mounting system is very practical.
6축 시뮬레이터를 활용한 능동형 엔진 마운팅 시스템 개발
김정훈(Jeong-Hoon Kim),김재산(Jae-San Kim),심재호(Jae-Ho Shim),박태익(Tae-Ik Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The NVH performance of a new type of active engine mount that offers increased advantages over a existing mount is examined using newly developed 6-DOF simulators. One is for the Active dynamic damper the other is for the pneumatic active mount. The target vibration signals from several parts of engine and subframe are measured and then regenerated those on the simulators. Active vibration control logic is verified and optimal logic is selected by using simulator. The performance of pneumatic active mount is measured in each control conditions and optimal control condition is selected by using simulator.
병원 기반 임상 수련이 119 구급대원의 활력징후 측정율에 미치는 효과
조유환,신상도,서길준,김재산 대한응급의학회 2007 대한응급의학회지 Vol.18 No.4
Purpose: To evaluate the effect of hospital-based emergency medical technician (EMT) training on pre-hospital evaluation. Methods: Three level 1 EMTs were trained at a regional emergency center for three months in an education program designed to improve pre-hospital evaluation. In order to assess the effectiveness of the training, we compared the rates at which EMTs measured vital signs during the three months before training (pre-training group) and the three months immediately after training (post-training group). We assigned one point to each of the following vital sign parameters when it was measured by an EMT: systolic blood pressure (SBP), diastolic blood pressure (DBP), pulse rate (PR), respiratory rate (RR), and body temperature (BT). The composite scores (range 0-5) were calculated and compared. Results: Of a total of 1,364 cases, 674 cases (49.4%) involved the pre-training group and 668 (52.2%) involved male patients. There were no significant differences in prehospital parameters (sex, proportion of injury, mental status, vital signs) or in pre-hospital management between the preand post-training group. The measurement rates of SBP, DBP, PR, and BT were not improved in the post-training group compared to the pre-training group, but the RR measurement rate was much greater in the post-training group than in the pre-training group (30.0% versus 7.7%, p<0.001). As a result, the composite score was also higher to a statistically significant degree in the post-training group (1.42±1.62 versus 1.18±1.39, p=0.003). Conclusion: Hospital-based training for EMT improved the rate at which vital signs were measured, mostly particularly the respiratory rate.