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Juniperus chinensis 7재배종과 Pinus densiflora 1재배종에 대한 핵형분석
김정석,김영두,정우규 ( Chung Suk Kim,Yeung Du Kim,Woo Gyu Jeong ) 한국산림과학회 1986 한국산림과학회지 Vol.75 No.1
This study was designed to investigate the karyotype analysis of Juniperus chinensis and its seven varieties, and F. densiflora and P. densiflora for. multicaulis. Following results were obtained. 1. Three varieties, J. chinensis v. kaizuka, J. chinensis v. aureo-variegata and J. chinensis v. procurnbens are turned out as tetraploids. 2. Varieties having many long chromosomes and long mean relative length of chromosomes are J. chinensis and J. chinensis v. aureo-globosa, while varieties having short chromosomes are J. chinensis v. horizontalis and J. chinerssis v. globosa. 3. Varieties with high mean ratio of long arm length to short arm are J. chinensis v. globosa and J. chinensis v. kaizuka, while a variety with the low mean ratio is J. chinensis v. aureo-globosa. 4. When chromosomes are arranged according to the Total length, the most similar variety with J. chinensis was J. chinensis v. sargentii, J. chinensis v. horizontalis, J. chinensis v. globosa and J. chinensis v. aureo-globosa, while the least similar one was J. chinensis v. procumbens. 5. Pinus densiflora for. multicaulis has shorter mean relative length of chromosome than P. densiflora, while the arm ratio of the former is higher than the tatter. 6. When chromosomes are arranged according to the total length, six ctuomosomes showed the same order between the two varieties. 7. P. densiflora for. multicaulis has many chromosomes with secondary constriction.
복합 신경회로망을 이용한 채터진동의 인프로세스 감시(II)
김정석,강명창,박철,Kim, Jeong-Suk,Kang, Myeong-Chang,Park, Cheol 한국정밀공학회 1995 한국정밀공학회지 Vol.12 No.12
The In-process minitoring of the chatter vibration is necessarily required to an automatic manufacturing system. In this study, we constructed a multi-sensing system using tool dynamoneter, accelerometer and AE(Acoustic Emission) sensor for a more credible detection of chatter vibration. And a new approach using a multiple neural network to extract the features of multi-sensor for the recognition chatter vibration is proposed. With the Back-propagation training process, the neural network memorize and classify the features of multi-sensor signals. As a result, it is shown by multiple neural network that the chatter vibration can be monitored accurately, and it can be widely used in practical unmanned system.
한국산 Juniperus rigida 의 두 산지의 핵형분석
김정석,정우규,안중극,정미정,한창숙 ( Chung Suk Kim,Woo Kyu Chung,Joong Kug Ahn,Mee Jeong Jeong,Chang Sook Han ) 한국산림과학회 1986 한국산림과학회지 Vol.73 No.1
Karyotypes are described for Juniperus rigida Sieb. et Zucc. in two provenances of Gyeong-nam and Choong-puk. Chromosome numbers of two provenances, are 2n=22. The most common feature of mitotic chromosomes was shown at the chromosome 7, which has secondary constriction on the short arm. And the most differential chromosome was shown at chromosome 9 from Gyeong-nam and chromosome 5 from Choong-puk provenance, which bore secondary constriction. The karyotype formulae are as follows; Gyeong-nam, Jinyang pravenance race is K(2n) = 22 = 2 A^m + 2B^m + 2C^m + 2D^(sm) + 2E^(st) + 2F^m + 2^(sc)G^m + 2H^m + 2^(sc)I^t + 2J^(st) + 2K^m Choong-puk, Jechun provenance race is K(2n) = 22 = 2A^(rn) + 2B^m + 2C^m + 2D^(st) + 2^(sc)E^(sm) + 2F^m + 2^(sc)G^m + 2H^m + 2I^m + 2J^(st) + 2K^(sm)
김정석,강명창,김전하,정연식,이종환,Kim, Jeong-Suk,Kang, Myung-Chang,Kim, Jeon-Ha,Jung, Youn-Shick,Lee, Jong-Hwan 한국기계가공학회 2003 한국기계가공학회지 Vol.2 No.3
The high speed machining technology has been improved remarkably in die/mold industry with the growth of parts and materials industries. Though the spindle speed of machine tool increases, the condition monitoring techniques of the machine tool, tool and workpiece in high speed machining ate incomplete. In tins study, efficient sensing technology in high speed machining is suggested by observing the characteristics of cutting force, gap sensor and accelerometer signal also, machinability of high-speed machining is experimentally evaluated sensing technique to monitor the machine tool and machining conditions was performed.
김정석(Jeong-Suk Kim),조용권(Yong-Kwon Cho),박진효(Jin-Hyo Park),문홍만(Hong-Man Moon) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.1
The hydrostatic bearings have a relatively small run-out comparing to its shape error by fluid film effect in hydrostatic state as like pneumatic bearing and have a high stiffness, load capacity and damping characteristics. As there is no maintenance and semipermanent in these bearing type, it has been usually adopted as main spindle bearing for grinding machine. In this thesis, to develop hydrostatic bearing for high speed spindle, the cooler setting temperature, bearing clearance and nozzle pressure of belt-driven hydrostatic bearing are investigated. The bearing temperature is decreased, as the cooler setting temperature is lower, nozzle pressure is higher and bearing clearance is wider. The front temperature of bearing is nearly 8℃ higher than the rear one up to 13,000 rpm of spindle revolution. The thermal deflection of X-axis is ±1.6 ㎛ in range of 12,000 rpm-13,000 rpm. Therefore, it is conformed that the built-in motor hydrostatic bearing can be used to high speed spindle.