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직렬과 병렬방식 이중효용 흡수식 냉동사이클의 성능 시뮬레이션
이윤환,오종택,오후규,박기원 麗水水産大學校産業技術硏究所 1998 産業基術硏究所 論文集 Vol.7 No.-
Condensing the global environmental problems such as CFCs, energy losses in heat recovery systems as well as summer peak time power demands, the development of high efficiency absorption refrigeration systems is one of the most promising method in this problems. In this study, simulation models of both series and parallel type, both using double-effect absorption cycle refrigeration systems. The results summarized as follows : ⑴ In the parallel type, the solution maximum temperature and the pressure of high temperature generator were adjusted by varing the distribution ratio of the solution, and the optimum value was found to be about 0.4. ⑵ The efficiency of the cooling cycle in both parallel and series systems were increased by decreasing the solution circulation ratio in the absorbers, while the solution maximum temperature and high temperature generator pressure were slightly increased.
여환호,안병후,김수관,김영균 大韓顎顔面成形再建外科學會 1992 Maxillofacial Plastic Reconstructive Surgery Vol.14 No.4
Tumors arising from nerve tissue are uncommon in the oral maxillofacial regions. Neurofibroma, a benign neurogenic tumor, can occur as circumscribed solitary or multiple lesions. A solitary neurofibroma is seldom undergo sarcomatous transformation, but fibromatosis is common. Therfore, it is important that we observe the oral and radiographic changes to help minimize the tremendous potential of the disease for facial disfigurement and altered function. The turmors were exised and there are no evidence of recurrence. The patients are satisfied with function and esthetic aspects.
정명선,김효정,류덕환 한국의류산업학회 2004 한국의류산업학회지 Vol.6 No.2
Loess was selected as one of the natural dyes and dye solution was extracted from it. With the dyes extracted from loess, the sample fabrics were dyed at 10, 20, and 30 minutes and then CuSO₄ was used to treat the dyed fabrics on the concentration of 3%, and 5%. Color difference and colorfastness of the sample fabrics with dyeing time and concentration of post-mordanted agent were analysed. The results were as follows: 1. Effective dying time was 20 minutes since any more dye up-take to the fabrics did not occur after that time. 2. There was distinctive dyeing effect according to whether post-mordanted method was done or not, but there was little effect between post-mordanted concentration of 3% and 5%. 3. There was no effect of the colorfastness on the post-mordanted concentration. The abrasion and laundering colorfastness of post-mordanted fabric samples was better than those of no post-mordanted fabric samples and the light colorfastness of the fabric samples was good regardless of post-mordanted method.
정상인에서 전기 및 자기 자극을 이용한 설 근육의 전기생리학적 평가
조은미,류종현,안성환,조경원,임건한,김진호,김후원 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.1
Background: Abnormality of lingual muscles is clinically common. But its exact clinical assessment is quite difficult. Evaluation of motor power of the lingual muscles and their neural pathway is limited because of anatomical inaccessibility and individual variation of subjective symptoms. Transcranial magnetic stimulation (TMS) of the human motor cortex is a non-invasive tool to assess the functional integrity of the fast conducting central motor pathways and electrical stimulation of lingual nerve is a conventional method of peripheral nerve conduction. Therefore both study will be helpful to understanding of pathophysiology of lingual abnormality. Until now there is no such report in Korea. This study was conducted to acquire the easier method and normal control values of Korean subjects. Method: We recorded the motor responses from the lingual muscles of 32 healthy subjects (22 men, 10 women) by focal cortical TMS with a circular coil. Motor potentials were recorded by means of surface electrodes applied on the both side of the tongue, following TMS several centimeters lateral from the vertex and parietooccipital cortex and peripheral electrical stimulation of the 12th cranial nerve at the lateral 1/3 point of the line between the midline and angle of mandible. Results: During moderate motor activation, majority of maximal motor response were obtained 4-6cm lateral to the vertex with similar latencies. And the responses from magnetic stimulation of the intracranial segment of hypoglossal nerve were discarded because of difficulty to obtain and unsatisfactory reproducibility. The latency of motor evoked potentials in right cortical stimulation was 10.08 ± 1.17 msec and in left stimulation 10.04 ± 1.32 msec. The amplitudes in right 2.15 ± 1.02, left 2.09 ± 1.11 mV. The latencies electric hypoglossal nerve stimulation were 2.42 ± 0.34 in right, 2.49 ± 0.35 msec in left side. The amplitudes were 2.90 ± 2.37 in right, 2.43 ± 1.86 mV in left side. Central conduction times as calculated by subtracting the response latencies obtained by magnetic and electric stimulation are right 7.65 ± 1.19, left 7.55 ± 1.35 msec. There was no significant difference between man and woman, Conclusion: The method may be efficient, noninvasive, painless, and easy reproduced. With more extensive application to various neurological disorders, it comes close to being an ideal clinical conduction study technique for this cranial nerve.
성숙미경산 흰쥐의 수정란이식에 관한 연구 2 . 외과적으로 이식한 수정란의 수태율
성환후(Hwan Hoo Seong),윤창현(Chang Hyun Yun) 한국축산학회 1987 한국축산학회지 Vol.29 No.3
This experiment was conducted to determine the effective method for transfer of embryos in mature rats. Total number of 941 ova were recovered from 115 donors and 327 embryos of morula to late blastocyst stage were transferred surgically to 52 recipients (3 to 12 embryos per recipient). The results obtained were summarized as follows: 1. Pregnancy rate after embryo transfer was significantly (p$lt;0.05) lower in embryos from superovulated rats (37.5%) than control rats (60%). Weight of young at birth and gestation period were not significantly different between the groups of recipient transferred with embryos from control and superovulated rats. 2. Pregnancy rates after transfer with cell stage of embryos (50% in morula vs 45% in blastocyst) were not significantly different. 3. Pregnancy rates after transfer with degree of synchronization were 62% in -24 hrs. 50% in D hrs, and 0% in +24 hrs., respectively. And gestation period with degree of synchronization were not significantly different. 4. Pregnancy rates with number of embryos transferred to recipients (3-5, 6-8 and 9-12) were significantly (p$lt;0.05) higher when 9-12 embryos transferred (63%) than 3-5 or 6-8 of embryos transferred (50% and 36%). Pregnancy rates after transfer were not affected by progesterone priming.