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The main objective of this study is to predict the wind power generation at the wind farm using various wake models. Modeling of wind farm is a prerequisite for prediction of annual energy production at the wind farm. In this study, we modeled 20 MW class Seongsan wind farm which has 10 wind turbines located at the eastern part of Jeju Island. WindSim based on the computational fluid dynamics was adopted for the estimation of power generation. The power curve and thrust coefficient with meteorology file were prepared for wind farm modelling. The meteorology file was produced based on the measured data of the Korea Wind Atlas provided by Korea Institute of Energy Research. Three types of wake models such as Jensen, Larsen, and Ishihara et al. wake models were applied to investigate the wake effects. From the result, Jensen and Ishihara wake models show nearly the same value of power generation whereas the Larsen wake model shows the largest value. New positions of wind turbines are proposed to reduce the wake loss, and to increase the annual energy production of the wind farm.
To determine the success rate and causes of failure of external dacryocystorhinostomy (DCR) in patient with epiphora. Thirty five eyes in 29 patients underwent DCR varying from 14 to 72 years of age were analyzed for this study retrospectively. Minimun follow up time was 6 months. The causes of epiphora were trauma(5 cases), dacryocystitis(1 case) and unknown(24 cases). Obstruction sites were related to anatomical surgical results. Obstruction at the lower lacrimal sac level group of patients showed success rate of 85.0% and 66.7% in canaliculi and common canaliculi level group of patients. The overall anatomical success rate of the procedure was 77.1%, and functional success rate was 60.0%. The causes of failure were granulation tissue and scar formation around the nasal opening in canaliculi and common canaliculi obstruction group especially.
The objective of this study was to assess the effect of implantation of PPSI(porous polyethylene sheets implant, Medpor^ⓡ) to repair of blowout fracture and the surgical outcome. The authors performed 20 orbital reconstruction using Medpor^ⓡ to reconstruct orbital wall defects through the transconjunctival approach. In 16 cases, silastic sheets also were used. Preoperatively, severe extraocular muscle movement limitation were noted in 13 cases and moderate in 7 cases. Postoperatively 15 cases were full corrected, 3 cases were partially corrected and 2 cases were not corrected. Enophthalmos resolved in 10 of 11 cases. There were significant improvement of symptoms and signs in patients on whom operated within 2 weeks after trauma. There was no infection, implant migration, or exposure. It was concluded that Medpor^ⓡ implant has several advantage of highly biocompatible, easy to handle, contour and position.
The excimer laser allows the controlled ablation of corneal tissue to correct refractive error. we analyzed clinical results of excimer laser photorefractive keratectomy on 70 eyes followed up more than 6 months from May 1994 to December 1996. The patients were divided into 3 groups according to their myopic degree ; group I : -2.0 ~ -3.75D, Ⅱ : -4.0~ -5.75D, Ⅲ : -6.0D ~ -9.0D We evaluated the amount of myopic correction, visual acuity, corneal opacity and complications. At 6 months after operation, uncorrected visual acuity over 0.8 was achieved in 93.7% in group I, 89.6% and 84% in group Ⅱ,Ⅲ. Achieved correction within ±1.0D at six months were 100%, 79.3% and 72% in each group. Mean manifest refraction(spherical equivalent) of each group were -0.34DM -0.4D and -0.85D at six months. Corneal haze was detected at 2 weeks after operation and disappeared at 3 months in almost cases. There was no significant change of intraocular pressure except two cases and delayed epithelial wound healing was noted in only one case. Blurred vision at night was common complain. Photorefractive keratectomy with 193 nm excimer laser appears to be very effective method for reducing low to moderate and range of -6.0D ~ -9.0D of myopia.
We prospectively analyzed the corneal topography of 26 eyes in 26 patients who had undergone scleral expansion for correcting presbyopia. We examined 26 eyes of 26 patients which were devided into 2 groups (mean age: 51 years, range 40-60 years) according to type of scleral expansion band, with computerized corneal topographic analysis system. Preoperatively and 5 times postoperatively (1day, 1week, 2weeks, 1month, 2months), quantitative descriptors of corneal topograpgy such as Sim K (simulated keratometry value), SRI(surface regularity index), and SAI(surface asymmetry index) were measured at each visit. The mean follow-up period was 43 days. Sim K of the operative eyes ranged from 0 to 2.5 (mean, 0.93) before operation, and mean 2.24 at postoperative 1 day in group Ⅰ. In group Ⅱ, Sim K was mean 2.20 at postoperative 1 day and decreased thereafter. SRI was from 0.54 to 1.39 and SAI was from 0.09 to 0.45 before operation. After operation, mean SAI was maximum at postoperative 2 week and mean SRI was maximum at postoperative 1 day and decreased thereafter. After two months, it became minimum. This study demonstrates that quantitative topographic change after scleral expansion for correcting presbyopia were great during first 1 week after surgery but this change diminished thereafter. Further long studies are in progress to evaluate the long term effects of this procedure.
To determine the usefulness of application of Mitomycin-C (MMC) and effectiveness of different concentration of MMC in external DCR. A total of 100 eyes of 87 patients diagnosed with primary acquired nasolacrimal duct obstruction were assigned randomly to either a MMC group or control group. The surgical procedures in both groups were same. In MMC group, a piece of neurosurgical cottonoid soaked with 0.4 mg/ml MMC was applied to the osteotomy site and then was removed after 5 and 10 minutes differently. Nasoendoscopic examination was performed at 1 month, 3 months, and 6 months after surgery for all patients. The causes of epiphora as trauma (20 cases), failed DCR (1 case), sinus surgery (2 cases), unknown (77 cases). The overall anatomical success rate of the procedure was 88% and functional success rate was 79%. Obstruction site was related to anatomical surgical results. Anatomical surgical outcome at lower lacrimal sac level group of patients showed a statistically significant success rate, but functional surgical outcome showed no significant difference between the two groups. The anatomical success rate was 87.7% and the functional success rate was 84.2% in MMC group. The anatomical success rate was 88.3% and the functional success rate was 74.4% in control group. Application of MMC and it's application time were not related to surgical results.
As the amount of chemicals increases, there is a global movement to reorganize the chemical management system. Korea has also reorganized its chemical management system to enact the act on Chemical Control and Registration and Evaluation etc. of chemical substance. However, it is true that there are not enough explanations in domestic workplaces. Therefore, deepening understanding of chemical control act and searched for a complementary point and future development direction. Through the proposed method, chemical control act should be widely adopted and studied both inside and outside the country as a safe chemical management system. 화학물질의 취급량 증가에 따라 화학물질 관리 제도를 전면적으로 개편하는 움직임이 국제적으로 일어나고 있다. 한국 역시 화학물질 관리 제도를 전면 개편하여 화학물질관리법과 화학물질 등록 및 평가에 관한 법률이 제정되었다. 하지만화학물질관리법의 경우, 법 시행 4년째를 앞두고 여러 개선사항이 드러나고 있다. 따라서 본고에서는 화학물질관리법의 제언한 개선사항에 대한 보완점을 연구하고 그에 맞는 발전방향을 제시하여 화학물질관리법이 오랫동안 안전한 화학물질 관리제도로서 대내외에 널리 도입되고 연구되었으면 하는 바람이다.