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당진 난지도 주변해역에서 분포하는 부유성 난 및 자치어의 종조성
윤병일,한경호,이성훈 한국수산해양기술학회(구 한국어업기술학회) 2018 수산해양기술연구 Vol.54 No.4
The ichthyoplanktons were sampled to study distribution of the ichthyoplankton in coastal waters of Nanji-Island in August and November 2015 and January and May 2016. During the study, fish eggs of eight different species were collected. Engraulis japonicus was the most dominant species which accounted 44.80%. Sebastes schlegeli comprised 31.39% of the total larvae and juveniles. The diversity index of species per month of the collected juveniles at Nanji Island from 2015 to 2016 was 0.598-1.770 and the evenness index was 0.432-0.761. In case of dominance index was 0.619-0.897 against the evenness index. The analyzed species diversity index by the each station was 0.818-1.945 and the dominance index was 0.492-0.897 against the species diversity index. The months of August and May exhibited similar results. In addition, the community structure was very similar in state 2 and state 3.
윤병일,홍찬규,김설,하유신,정재희,김세웅,조용현,손동완 대한비뇨의학회 2014 Investigative and Clinical Urology Vol.55 No.1
A 7-year-old boy was diagnosed with a recurrent embryonal rhabdomyosarcoma in theretroperitoneum. After resection of the mass, direct end-to-end anastomosis of the ureterwas not possible owing to the length of the resected segment. Accordingly, we performedureteral substitution by using the appendix to repair the ureteral defect.
윤병일,배웅진,김수진,김효신,하유신,손동완,황성연,김세웅 대한남성과학회 2013 The World Journal of Men's Health Vol.31 No.2
Purpose: The aim of this study was to investigate the anti-inflammatory effects of a new herbal formula (WSY-1075) in a nonbacterial prostatitis rat model.Materials and Methods: Prostatitis was induced in male Wistar rats (n=32) by treatment with 17 beta-estradiol and dihydrotestosterone for 4 weeks. After the induction of prostatitis, the rats were randomly divided into one of four treatment groups: control (n=8), ciprofloxacin (n=8), WSY-1075 (100 mg/kg) (n=8), and WSY-1075 (400 mg/kg) (n=8). After 4 weeks of treatment, the prostatic proinflammatory cytokine (tumor necrosis factor-α, interleukin [IL]-6, and IL-8) levels and histological findings were noted.Results: The ciprofloxacin and WSY-1075 treatment groups showed significantly decreased proinflammatory cytokine levels compared with the control group. Histologically, treatment with ciprofloxacin and WSY-1075 significantly suppressed the severity of prostatitis lesions compared with those in the control group. No differences in the proinflammatory cytokine levels or histologic findings were observed with the dose dependent treatment of WSY-1075.Conclusions: The new herbal formula, WSY-1075, showed effective anti-inflammatory activities in the prostate and may be useful for the clinical treatment of nonbacterial prostatitis. Our findings suggest that WSY-1075 has a beneficial effect on the prevention and treatment of nonbacterial prostatitis.
탄화규소섬유와 탄소섬유 하이브리드 직물을 강화재로 한 SiC 매트릭스 세라믹복합재의 기계적물성, 산화 및 삭마 저항성 개선 연구
윤병일,김명주,김재성,권향주,윤성태,김정일 한국복합재료학회 2019 Composites research Vol.32 No.3
In this study, Cf/SiC, SiCf/SiC and Cf-SiCf/SiC ceramic composites reinforcing carbon fiber, SiC fiber and hybrid fiber were fabricated by hybrid TGCVI and PIP process. After the thermal shock cycle, 3-point bending and Oxy-Acetylene torch test, their mechanical behavior, oxidation and erosion resistance were evaluated. The Cf/SiC composite showed a decrease in mechanical property along with increasing temperature, a pseudo-ductile fracture mode and a large quantity of erosion. The SiCf/SiC composite exhibited stronger mechanical property and lower erosion rate compared to the Cf/SiC, but brittle fracture mode. On the other hand, hybrid type of Cf-SiCf/SiC composite gave the best mechanical property, more ductile failure mode than the SiCf/SiC, and lower erosion rate than the Cf/SiC. During the Oxy-Acetylene torch test, the SiO2 formed by reaction of the SiC matrix with oxygen prevented further oxidation or erosion of the fibers for Cf-SiCf/SiC and SiCf/SiC composites particularly . In conclusion, if a hybrid composite with low porosity is prepared, this material is expected to have high applicability as a high temperature thermo-structural composite under high temperature oxidation atmosphere by improving low mechanical property due to the oxidation of Cf/SiC and brittle fracture mode of SiCf/SiC composite. 본 연구에서는 탄소섬유, 탄화규소섬유 그리고 하이브리드섬유를 강화재로 하여 TGCVI와 PIP 혼합 공정으로 Cf/SiC, SiCf/SiC, Cf-SiCf/SiC의 세라믹복합재를 제조하였다. 열충격싸이클시험, 3-점 굴곡험과 Oxy-Acetylene토취 시험후에 그들의 기계적물성, 산화저항성과 내삭마성을 평가하였다. Cf/SiC복합재는 온도 증가에 따라서 기계적물성의 감소와 준 연성의 파단모드, 그리고 높은 삭마량을 보였다. SiCf/SiC복합재는 Cf/SiC 복합재에 비하여 강한 기계적물성, 낮은 삭마량을 그리고 취성의 파단모드를 나타냈다. 한편 하이브리드 복합재는 가장 우수한 기계적물성과 SiCf/SiC보다는 연성의 파단모드 그리고 Cf /SiC 보다 낮은 삭마량의 결과를 나타냈다. Oxy-Acetylene토취 시험 중에 SiC매트릭스는 산화되어 SiO2층을 형성하였으며, 특히 이 층은 Cf-SiCf/SiC 와 SiCf/SiC 복합재에서 섬유의 추가적인 삭마를 막는 역할을 하는 것으로 나타났다. 결론적으로 낮은 기공율을 갖는 하이브리드 복합재를 제조한다면, Cf/SiC의 산화로 인한 기계적물성의 감소와 SiCf/SiC 복합재의 취성 파단모드의 개선으로 고온 산화분위기에서 고온열구조재로의 적용이 높을 것으로 기대한다.