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개불(Urechis unicinctus) 저정낭내(貯精囊內) 웅성생식세포(雄性生殖細胞)의 분화(分化)
정진욱,최임순,신길상,주충노,Jeong, Jin-Wook,Choe, Rim-Soon,Shin, Kil-Sang,Joo, Chung-No 한국현미경학회 1989 Applied microscopy Vol.19 No.1
The storage sac of U. unicinctus can be divided into two parts morphologically as well as functionally ; one is proximal and the other distal storage sac. It is because of the seasonal morphological change of the storage sac caused by sperm accumulation in the storage sac. The proximal storage sac contains the mature sperm with the dumbbell-shaped acrosome and well developed one or two mitochondria in the middle piece, whilst the sperm of hemispherical acrosome associate closely with an accessory cell in the distal storage sac. This means that the sperm do not perform the synchronous development in a storage sac, which is not the case of sperm development in the coelomic cytophorus. In addition, the basal membrane of the distal storage sac is different from that of the proximal storage sac in term of tissue formation. Connective tissues, acces-sory cells and small lumen develop on the basal membrane of the distal sto-rage sac, which is well contrasted with the thin basal membrane of the proximal storage sac. The function of the storage sac is discussed in rela-tion of the sperm development and the seasonal change.
탄소섬유/폴리아미드 6 복합재료의 비등온 결정화 거동 및 냉각속도에 따른 물성 분석
정진욱,조원기,이하람,원종성,배일준,이승구,Jeong, Jin Wook,Cho, Won Gi,Lee, Ha Ram,Won, Jong Sung,Bae, Il Joon,Lee, Seung Goo 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.6
Carbon fiber/polyamide 6 (CF/PA6) composites were prepared via film melt impregnation and their crystallization and mechanical properties were studied. The non-isothermal crystallization behavior and mechanical properties of polyamide 6 and CF/PA6 were investigated at different cooling rates. The crystallization time of CF/PA6 decreased depending on the cooling rate compared to that of polyamide 6. The carbon fibers likely acted as nucleating agents in the polyamide 6 matrix. The flexural strength of the composites increased when manufactured at lower cooling rates due to the effects of increased crystallinity as the crystallization continued for a long time. In addition, as the cooling rate increased, the impact resistance increased.
DGEBA/phenol Novolac 에폭시 수지의 경화거동 및 열적 특성
정진욱,원종성,조원기,조호현,김의화,이승구,Jeong, Jin Wook,Won, Jong Sung,Jo, Won Gi,Cho, Ho Hyeon,Kim, Eui Hwa,Lee, Seung Goo 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.1
To enhance the viscosity and thermal resistance of DGEBA epoxy resin, a phenol novolac-type epoxy resin was added to a hot melt-type epoxy prepreg. The mixtures of DGEBA solid and liquid epoxy resin, and phenol novolac epoxy resin were prepared with different mixing ratios. The effect of the mixing ratio on the curing behavior, thermal stability and viscosity of the blended epoxy resin was investigated. The curing behavior did not vary significantly with the mixing ratio. The activation energy increased as the content of phenol novolac-type epoxy resin was increased up to 40 wt%. The thermal resistance and viscosity of the mixed epoxy resin increased significantly when the phenol novolac-type epoxy resin and solid epoxy resin occupied more than 20 wt%.
정진욱,김준형,정영진,박무식,손대구,한기환,Jeong, Jin-Wook,Kim, Jun-Hyung,Jung, Yung-Jin,Park, Mu-Sik,Son, Dae-Gu,Han, Ki-Hwan 대한성형외과학회 2010 Archives of Plastic Surgery Vol.37 No.3
Purpose: Continuous irrigation method is an important step in managing wound infection. V.A.C. devices have been used in intractable wounds for reducing discharge, improving local blood flow, and promoting healthy granulation tissue. We expect synergistic effects of reduced infection and more satisfactory, accelerated wound healing when using both methods simultaneously. This study evaluated continuous irrigation combined with V.A.C. appliance for treatment of infected chronic wounds. Methods: We reviewed data from 17 patients with infected intractable chronic wounds. V.A.C. device (Group A) was used in 9 patients, and V.A.C. with antibiotics irrigation (Group B) was used in 8 patients. We placed Mepitel$^{(R)}$ on the surface of wound and placed an irrigation and aspiration tube on each side. A sponge was placed on the Mepitel$^{(R)}$ and covered with film dressing. The wound was irrigated continuously with mixed antibiotics solution at the speed of 200 cc/hr and aspirated through the wall suction at the pressure of -125 mmHg. V.A.C. applied time, wound culture and wound size were compared between the two groups. Results: No complication were seen in two groups. Compared with Group A, in the Group B, V.A.C. applied time was shortened from 32.7 days to 25.6 days and showed efficacy in the reduction rate of wound size. No statistical differences were shown in bacterial reversion. Conclusion: V.A.C. appliance with continuous irrigation is an effective new method of managing infected chronic wounds and useful to reduce treatment duration and decrease wound size. Moreover it could be applied more widely to infected wound.