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윤주경,김규진,천승주,김용석,Yoon J. K.,Kim K. C.,Cheon S. J.,Kim Y. S. 한국응용곤충학회 1982 한국식물보호학회지 Vol.21 No.2
자두 살구나무에 기생하는 나무좀의 종류와 생태를 조사하였던 결과를 요약하면 다음과 같다. 1. 자두살구나무를 하는 나무좀은 서울나무좀 (Scolytus seulensis), 뽕나무좀(Xyleborus atratus), 오리나두좀(X. germanus, 붉은목나무좀(X. rubricollis) 및 감나무좀(X. saxeseni)을 채집하였고 기주로는 서울나무좀은 자두와 살구나무에 뽕나무좀 오리나무좀, 감나무좀은 살구, 밤나무에 붉은목나무좀은 자두, 밤나무등에 각각 침입함을 확인하였는데 자두, 살구나무에 발생량과 피해가 심한 종은 서울나무좀이었다. 2. 서울나무좀의 발생소장을 보면 1980년 7월 10일과 8월 25일 1981년에는 7월 15일과 8월 20일로 1화기는 7월 중순에 2화기는 8월 하순의 1년 2회로 추정되었다. 3. 살구품종중 서울나무좀에 의한 m당 충공수는 Henderson(Apricot)과 V-49057(Apricot)은 100개 이상이었으며 Derbyroyal(Apricot)은 12개 이하로 적었다. 대체로 한국재래종과 일본계도입종들에 비하여 구주계품종에 치해공이 많았고 방향별 차이는 적었으나 동서남북순이었으며 모공의 길이가 길수로 유충공수도 많았다. 4. 성충의 교미는 $27^{\circ}C$ 내외가 많았으며 5.6월의 교미는 7.8월에 비하여 교미시간이 다소 길었다. 5. 자두나무 과실중의 변화는 피해주에서 개화 4주일 후인 6월 23일에 12.25g으로서 과중증가가 없었으나 건전주의 과실은 6월 23일에 32.23gr이었고 수확기인 7월 7일에는 63.5gr이었다. 6. 서울나무좀의 천적으로 어깨넓적좀벌과의 일종인 Eurytoma sp.를 서울나무좀의 노숙유충이나 용에서 용상태로 발생하였고 5월 초부터 6월 25일 사이에 우화하였으며 성충의 일주일 내외였다. The ecological studies were conducted to identify some bark-beetles on apricot and plum trees in Jeonnam province. Harmful bark-beetles caught from apricot and plum trees were identified as Scolytus seulensis. Xyleborus atratus., X. germanus, X. rubricollis and X. saxeseni. The seoul barkbeetle emerged during the period from early May to late October $1980\~1981$, it happens twice in a year, with the peak July 10 and August 25 in 1950, July 15 and August 20 in 1981. A daily peak emerged for adults was at 11 AM to 1 PM. Distribution of holes on the apricot stems varied; more than 100 holes per meter in Henderson (Apricot) and Y-49057 (Apricot), 12 holes per meter in Derbyroyal (Apricot). Comparatively more holes were found in the European variety, and the cardinal distribution was in the order of east, south, west and north. The longer the longth of the mother-gallery, the greater number of egg-gallery found. Optimum temperature for mating was $27^{\circ}C$. The time for mating was longer during May-June than July-August. The fruit weight of damaged plum tree reached 12.25g around four weeks after flowering; where as that of normal tree increased up to 63.5g at harvest time. The natural enemy of the seoul bark beetle was Eurytoma sp. They were found as mature larva or pupa and they emerged from early May to the middle of June. Adult longevity was about a week.
탄소강의 초석페라이트와 시멘타이트의 형상이 미끄럼마멸 거동에 미치는 영향 분석
허하리(H. L. Hur),권혁우(H. Gwon),김명곤(M. G. Kim),김용석(Y. S. Kim) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
This study was conducted to elucidate the correlation between wear resistance and cementite morphology (degree of spheroidization) in carbon steel. For that purpose, we analyzed effect of the existence of pro-eutectoid ferrite and cementite morphology on the sliding wear of medium and high carbon steel. AISI 52100 bearing steel and S45C medium carbon steel were heat treated to obtain full pearlite and ferrite + pearlite microstructure. After the heat treatment, a spheroidizing heat treatment was performed on both steel to spheroidize the pearlite. Sliding wear tests were carried out using a pin-on-disk wear tester with the steel specimens as a disk. An alumina (Al₂O₃) ball was used as a pin counterpart. The sliding wear tests were carried out at room temperature in the air with humidity of 40±2 %. Adapted sliding distance and applied load was 300 m and 100 N, respectively. Sliding speed was 0.1 m/s and the wear-track radius was 9 mm. Worn surfaces and cross-sections of the wear track were examined using an SEM. Micro Vickers hardness of the wear-track subsurface was measured as a function of depth from the worn surface. It was found that sliding-wear resistance of both AISI 52100 bearing steel and S45C steel decreased as the cementite morphology become more spheroidized.
2000cc 세단 트렁크용 휠체어 리프트 시스템 구축을 위한 기구학 및 제어 연구개발
김영재(Y. J. Kim),나선준(S. J. Na),김태운(T. U. Kim),김용석(Y. S. Kim),양순용(S. Y. Yang) 유공압건설기계학회 2018 유공압건설기계학회 학술대회논문집 Vol.2018 No.6
When wheelchair users use a car, a situation occurs in which the wheelchair must be loaded on the vehicle trunk. Wheelchair users are assisted by others for loading wheelchair on the car"s trunk. However, due to the weight of the wheelchair and the inconvenient structure of the wheelchair, the normal person also have difficulty in loading and unloading. Therefore, it is necessary to provide an auxiliary system to help the disabled to load the wheelchair in the trunk when boarding the vehicle. This system design studies the wheelchair lift system in the narrow trunk space of the 2000cc class sedan. Mechanisms are constructed to load and unload 15kg wheelchair within 80sec, and controlled by the Arduino-based control system. Future research will develop the system that automatically transports wheelchair from the driver"s seat to the wheelchair cage and will complete the automatic wheelchair transport-lift system by connecting with the lift system.