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Chung, Ui Seok,Min, Ji Hong,Lee, Pyoung-Chan,Koh, Won-Gun Elsevier 2017 Colloids and surfaces. A, Physicochemical and engi Vol.518 No.-
<P><B>Abstract</B></P> <P>For the purpose of developing self-healing skin layers of instrument panels in automobiles, mechanically and thermally stable microcapsules containing healing agents were prepared and incorporated into a polyurethane (PU) matrix. Two different poly(urea-formaldehyde) (PUF) microcapsules containing either a polydimethylsiloxane (PDMS)/Pt catalyst (Pt) blend or crosslinker were synthesized using <I>in situ</I> emulsion polymerization. However, the resulting microcapsules were mechanically and thermally weak. More than 40% of the microcapsules were broken during the washing/drying process, and capsule decomposition began at 200°C. These properties of microcapsules were greatly enhanced by decreasing the capsule size and depositing an additional urea-formaldehyde (UF) layer onto pre-formed PUF microcapsules. The former was accomplished by tuning the stirring speed during the reaction and the latter by adding more urea components. Under optimized conditions, only approximately 10% of microcapsules were broken after the same washing/drying process, and the decomposition temperature was raised to 250°C. The two different optimized microcapsules were successfully embedded in a PU matrix and could be broken upon matrix cracking, thereby releasing the healing agent to the target areas <I>via</I> capillary effects. Subsequently, it was confirmed that the cracked portions were repaired through chemical and/or physical interactions within the healing system.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mechanically and thermally stable self-healing microcapsules were prepared. </LI> <LI> Resultant microcapsules could contain PDMS-based healing agents. </LI> <LI> Microcapsule-embedded self-healing PU matrixes were prepared. </LI> <LI> Self-healing PU matrix could repair the scratch by releasing healing agents. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
( Chung Hyeok Lee ),( Eun Mi Jin ),( Hee Seok Seo ),( Tae-ui Ryu ),( Seung Phil Hong ) 대한피부과학회 2021 Annals of Dermatology Vol.33 No.3
Background: Fractional picosecond lasers is effective for the treatment of wrinkles or acne scars. Objective: To investigate the safety and efficacy of treatment with a fractional 1,064-nm picosecond laser with a diffractive optic element for facial wrinkles and acne scars. Methods: This prospective open-labeled trial comprised 22 subjects with facial wrinkles or acne scars. Subjects received three laser treatments with a fractional 1,064-nm picosecond laser at 3-week intervals. The efficacy and safety were evaluated at every visit and 2 months after the final treatment (14 weeks from the first treatment session). Global photographic assessments were performed by three blinded dermatologists and the subjects. Skin profilometry was performed using three-dimensional digital photographs; viscoelasticity was measured. Results: The overall mean global improvement scores assessed by the dermatologists at weeks 3, 6, and 14, were 1.8±1.46, 2.5±1.88, and 3.5±1.84, respectively, and those assessed by the subjects were 2.7±2.08, 4.1±2.24, and 5.0±2.52, respectively. Skin profilometry showed significant improvements in the skin wrinkles, texture, depressions, and pores. The gross elasticity and skin firmness significantly improved by 10.96% and 9.04%, respectively. The major adverse reactions were erythema, pruritus, and petechiae, which disappeared within 2∼3 days. Conclusion: The fractional 1,064-nm picosecond laser is an effective and safe therapeutic modality for skin rejuvenation. (Ann Dermatol 33(3) 254∼262, 2021)
가스터빈 설비의 운전신뢰도 향상을 위한 감시시스템 개발
서석빈(Seok-Bin Seo),정재화(Jae-Hwa Chung),박세익(Se-Ik Park),김의식(Ui-sik Lim) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
The present study has been conducted a development of a monitoring system for enhanced reliability of gas turbine. The system can monitor both combustion oscillation and mechanical vibration and analyze the cause of abnormal conditions on gas turbine. The system has an advance to identify mechanical vibration caused by combustion oscillation
윤의성 ( Ui Seoung Yoon ),민학진 ( Hak Jin Min ),김진수 ( Jin Soo Kim ),오현석 ( Hyun Seok Oh ),정인화 ( In Hwa Chung ),박기홍 ( Ki Hong Park ),서재성 ( Jae Sung Seo ) 대한고관절학회 2011 Hip and Pelvis Vol.23 No.3
결절종은 수근관절과 수부에 가장 많이 발생하며, 슬관절, 족근관절 및 족부에도 발생한다. 간혹 고관절에서의 발생을 보고한 예는 있으나 비구와에서 발생된 결절종은 보고된 증례가 매우 드물다. 저자들은 고관절의 비구와에 발생한 결절종을 1예 경험하였기에 치료 결과를 문헌 고찰과 함께 보고하는 바이다. Ganglions commonly occur on the hand, wrist, knee, ankle and foot, with occasional development around the hip joint. Ganglion in the acetabular fossa is rare. We present a case of a ganglion in the acetabular fossa of the hip with treatment.
Sung-Sik Kang,Ui-Hyung Kim,Myung-Suk Lee,Seok-Dong Lee,Sun-Sik Jang,Ki-Yong Chung,Hyun-Joo Kim,Sang-Rae Cho 한국수정란이식학회 2018 한국수정란이식학회 학술대회 Vol.2018 No.11
In this study, we examined total number, motility and plasma membrane integrity of epididymal spermatozoa from cauda epididymis of bull after preservation at 4ºC. Totally, 23 testicles were castrated from 23 bulls (mean±standard error, age of days = 426.0±7.3, body weight (kg) = 379.7±8.4, scrotal circumference (cm) = 31.0±0.4) at Hanwoo Research Institute, NIAS, and transported to laboratory and preserved on 1, 4 and 6 days at 4 ºC. As control, epididymal spermatozoa recovery from 7 testicles was conducted after transportation to laboratory immediately. In experiment 1, we compared total number of spermatozoa among groups. Total number of spermatozoa from epididymis was not significantly on different preservation day of 0, 1, 4 and 6 which is 1778.0±304.7, 1824.8±343.9, 1228.4±91.7, 1201.8±178.6×106 cells/ml, respectively). In experiment 2, we examined spermatozoa motility and motility parameters (VCL (μm/s), VSL (μm/s), VAP (μm/s), LIN (%)) by computer assisted sperm analysis (SCA, MicroOptic) system. Percentage of motile on 0 and 1 day (88.9±5.2 and 85.8±6.1) was significantly higher than that on 4 and 6 days (32.6±6.5 and 34.3±8.25). Percentage of VCL (μm/s) on 0 and 1 day (93.5±7.6 and 83.0±14.9) was significantly higher than that on 4 and 6 days (36.6±5.1 and 39.5±5.5) (p<0.05). Percentage of VSL (μm/s) on 0 day (28.0±2.1) was significantly higher than that on 1, 4 and 6 days (20.2±3.0, 9.0±2.0 and 8.5±1.6, p<0.05). Percentage of VAP (μm/s) on 0 and 1 days (49.4±3.8 and 41.3±6.6) was significantly higher than that on 4 and 6 days (18.2±3.0 and 19.3±2.8, p<0.05). Percentage of LIN (%) on 0 day (30.7±2.6) was significantly higher than that on 4 and 6 days (23.4±2.7 and 21.1±1.0, p<0.05). Motility of spermatozoa was divided into 4 groups (fast progresive, slow progressive, non-progressive and immotile) based on WHO guideline. Percentage of fast progressive on day at 0 was significantly higher than that on 1, 4 and 6 days (0, 1, 4 and 6 days vs. 19.8±1.9, 10.2±1.1, 2.6±1.0 and 2.3±1.2%, respectively). In conclusion, cauda epididymal spermatozoa should be recovered within one day after preservation at 4 ºC to recover high quality of epididymal spermatozoa in Hanwoo bull
Sung-Sik Kang,Ui-Hyung Kim,Myung-Suk Lee,Seok-Dong Lee,Sun-Sik Jang,Ki-Yong Chung,Hyun-Joo Kim,Sang-Rae Cho 한국수정란이식학회 2018 한국수정란이식학회 학술대회 Vol.2018 No.11
In this study, we examined number, motility and plasma membrane integrity of spermatozoa from six regions of epididymis in bull. Six testicles with epididymides were castrated from six bulls (mean±standard error, age of days = 441.3±9.6, body weight (kg) = 367±8.4, scrotal circumference (cm) = 30.7±0.4) at Hanwoo Research Institute, NIAS and transported to laboratory within 1 hour. Testicular weight, length, width and circumference were recorded. Epididymis in each bull was randomly used for recovery of spermatozoa. Epididymis was divided into six regions: efferent duct (ED), caput, corpus, proximal cauda (Pcauda), distal cauda (Dcauda) and vas deferens (VD). In experiment 1, we examined sperm number of each region of epididymis. Each region of epididymis contained different number of spermatozoa: ED (37.8±15.7 × 106cells/ml, 8.2%), caput (93.6±18.8 × 106cells/ml, 20.2%), corpus (33.0±8.5 × 106cells/ml, 7.1%), Pcauda (104.2±23.5 × 106cells/ml, 22.5%), Dcauda (180.5±32.5 × 106cells/ml, 39.0%) and VD (14.0±5.0 × 106cells/ml, 3.0%). In experiment 2, sperm motility of each epididymal region was examined by computer assisted sperm analysis (SCA, MicroOptic) system. Sperm motility was divided into 4 groups (fast progressive, slow progressive, non-progressive and immotile) based on WHO guideline. Percentages of fast progressive of Pcauda and Dcauda (11.0±2.3 and 15.4±3.6%) were significantly higher than that of ED, Caput, Corpus and VD which is 0.1±0.1, 1.5±0.6, 1.9±0.7 and 0.3±0.2%, respectively (p<0.05). In experiment 3, percentage of intact plasma membrane spermatozoa of each regions were examined by hypoosmotic swelling test. Percentages of intact plasma spermatozoa were not significantly different among six regions of epididymis: ED, caput, corpus, Pcauda, Dcauda and VD which is 68.0±8.6, 74.0±5.3, 68.5±6.2, 70.8±5.5, 71.0±5.8 and 64.6±10.8%, respectively. In conclusion, in the present study, we found out distribution, motility and plasma membrane integrity of spermatozoa from six regions of epididymis in Hanwoo bull. These results will be contributed to basic research about spermatozoa transportation and characters in epididymis of bull.
Park, Jin-Young,Chung, Jung-Ho,Lee, Jung-Seok,Kim, Hee-Jin,Choi, Seong-Ho,Jung, Ui-Won Korean Academy of Periodontology 2017 Journal of Periodontal & Implant Science Vol.47 No.1
Purpose: Optical coherence tomography (OCT) is a noninvasive diagnostic technique that may be useful for both qualitative and quantitative analyses of the periodontium. Micro-computed tomography (micro-CT) is another noninvasive imaging technique capable of providing submicron spatial resolution. The purpose of this study was to present periodontal images obtained using ex vivo dental OCT and to compare OCT images with micro-CT images and histologic sections. Methods: Images of ex vivo canine periodontal structures were obtained using OCT. Biologic depth measurements made using OCT were compared to measurements made on histologic sections prepared from the same sites. Visual comparisons were made among OCT, micro-CT, and histologic sections to evaluate whether anatomical details were accurately revealed by OCT. Results: The periodontal tissue contour, gingival sulcus, and the presence of supragingival and subgingival calculus could be visualized using OCT. OCT was able to depict the surface topography of the dentogingival complex with higher resolution than micro-CT, but the imaging depth was typically limited to 1.2-1.5 mm. Biologic depth measurements made using OCT were a mean of 0.51 mm shallower than the histologic measurements. Conclusions: Dental OCT as used in this study was able to generate high-resolution, cross-sectional images of the superficial portions of periodontal structures. Improvements in imaging depth and the development of an intraoral sensor are likely to make OCT a useful technique for periodontal applications.