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성견의 실험적 상피하 결합조직 이식시의 치주조직의 치유
정현철,최성호,조규성,채중규,김종관,Jung, Hyun-Chul,Choi, Seong-Ho,Cho, Kyoo-Sung,Chai, Jung-Kyi,Kim, Chong-Kwan 대한치주과학회 1997 Journal of Periodontal & Implant Science Vol.27 No.2
Several methods have been used for regeneration of tissue lost by periodontal disease. Subepithelial connective tissue graft technique, one of the technniques of mucogingival surgery, is used for the regeneration in esthetic problems such as recession, and denuded root coverage. This study is performed to evaluate the healing process and the regeneration and reattachment of periodontal tissue, including the reconstruction of junctional epithelium, and connective tissue. Alveolar defects in five adult dogs were treated with periodontal surgery and were attained by removing the marginal alveolar bone by $4{\time}3mm$ from CEJ in the labial side of incisors, and root surfaces were planed. The experimental sites were divided into two groups as follows. 1. root planing alone(control group) 2. with connective tissue graft (Experimental Group) In the two groups flaps were positioned and sutured tightly, the healing processes were observed and were histologically compared with each other after 2days, 4days, 1week, 2weeks, 4weeks. The results were obtained as follows : 1. In the two groups blood clots were observed as early as 2 and 4 days, and were resorbed at 1 week. 2. In the two groups moderate inflammation was observed as early as 2 and 4 days, decreased at 1 and 2 weeks, and disappeared at 4 weeks. 3. Junctional Epithelium migration was more significant in the control group, and was restrained by graft materials in the experimental group. 4. Features of connective tissue fiber attachment partially showed the parallel pattern in the two groups from 2 weeks, and entirely from 4weeks. 5. Anastomosis, between graft and connective tissue, appeared from 4 days in the experimental group and the border between them was not discriminated at 4weeks.
고효율 실리콘 태양전지를 위한 lotus surface 구조의 형성
정현철,백용균,김효한,음정현,최균,김형태,장효식,Jung, Hyun-Chul,Paek, Yeong-Kyeun,Kim, Hyo-Han,Eum, Jung-Hyun,Choi, Kyoon,Kim, Hyung-Tae,Chang, Hyo-Sik 한국결정성장학회 2010 韓國結晶成長學會誌 Vol.20 No.1
단결정 실리콘 태양전지의 광학적 손실을 감소시키는 표면 텍스쳐링은 최종 셀의 효율을 향상시키기 위하여 매우 중요하다. 본 연구에서는 2-step texturing의 공정으로 기존의 텍스쳐링에서 이루어진 피라미드에 수 많은 sub-micrometer 사이즈의 구조를 형성시켰다. $AgNO_3$ 용액으로 웨이퍼 표면에 Ag코팅을 한 후, 그 웨이퍼를 다시 HF/$H_2O_2$ 용액으로 수십초 동안 식각을 거치게 된다. 결과적으로, 피라미드 위에 생성된 수 nm사이즈의 구조물들은 $AgNO_3$의 농도 및 식각 시간의 변화에 의해 그 크기와 굵기가 변화하는 것을 알 수 있었다. 웨이퍼의 표면이 2-step texturing에 의해 식각이 이루어지면 연잎의 거친 표면과 비슷해지고, 그 결과 평균 10% 이상의 반사율을 보이던 기존 웨이퍼에서 3% 이하의 낮은 반사율을 얻을 수 있었다. 이는 일반적인 텍스쳐링과 anti-reflection coating을 거친 웨이퍼의 반사율보다 낮은 결과이다. The reduction of optical losses in mono-crystalline silicon solar cell by surface texturing is a critical step to improve the overall cell efficiency. In this study, we have changed the sub-micrometer structure on the micrometer pyramidal structure by 2-step texturing. The Ag particles were coated on the micrometer pyramid surface in $AgNO_3$ solution, and then the etching with hydrogen fluoride and hydrogen peroxide created even smaller nano-pyramids in these pyramids. As a result, we observed that the changes of size and thickness of nano structure on pyramidal surface were determined by $AgNO_3$ concentration and etching time. Using 2-step texturing, the surface of wafers is etched to resemble the rough surface of a lotus leaf. Lotus surface can reduce average reflectance from 10% to below 3%. This reflectance is less than conventional textured wafer including anti-reflection coating.
시계열 프레임워크를 이용한 효율적인 클라우드서비스 품질·성능 관리 방법
정현철,서광규,Jung, Hyun Chul,Seo, Kwang-Kyu 한국반도체디스플레이기술학회 2021 반도체디스플레이기술학회지 Vol.20 No.2
Cloud service has the characteristic that it must be always available and that it must be able to respond immediately to user requests. This study suggests a method for constructing a proactive and autonomous quality and performance management system to meet these characteristics of cloud services. To this end, we identify quantitative measurement factors for cloud service quality and performance management, define a structure for applying a time series framework to cloud service application quality and performance management for proactive management, and then use big data and artificial intelligence for autonomous management. The flow of data processing and the configuration and flow of big data and artificial intelligence platforms were defined to combine intelligent technologies. In addition, the effectiveness was confirmed by applying it to the cloud service quality and performance management system through a case study. Using the methodology presented in this study, it is possible to improve the service management system that has been managed artificially and retrospectively through various convergence. However, since it requires the collection, processing, and processing of various types of data, it also has limitations in that data standardization must be prioritized in each technology and industry.
태권도 품새 선수의 신체구성, 유ㆍ무산소능력 및 경기 중 운동강도에 관한 연구
정현철(Jung, Hyun-Chul),강효정(Kang, Hyo-Jung),김현배(Kim, Hyun-Bae),송종국(Song, Jong-Kook) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.4
The purpose of the study was to determine gender-related difference of body composition, aerobic and anaerobic power in Taekwondo poomsae athletes. Nineteen well trained male(n-10) and female(n=9) collegiate Taekwondo poomsae athletes participated in the study. Percent body fat, fat tissue, lean tissue and bone mineral density(BMD) at four sites(whole body, lumber, femur, and forearm) were measured by DXA. Subjects performed a graded incremental maximal exercise on treadmill and supramaximal exercise(Wingate anaerobic test). To evaluate the exercise intensity during the poomsae competition heart rate and blood lactate concentration were measured. Male athlete had significantly higher BMD in whole body and femur sites. But there were no differences at the site of lumbar and forearm between gender. Significant difference could be obtained for aerobic and anaerobic capacity between male and female taekwondo athletes. Male athletes had significantly higher VO₂max(61.2 ㎖ㆍ㎏ㆍmin-1) and VEmax(125.6 Lㆍmin-1) than those of female athletes(45.7 ㎖ㆍ㎏ㆍmin-1, 78.0 Lㆍmin-1). However, no differences were founded in HRmax. and AT. Peak and average power were significantly higher in male athletes than female athletes. Blood lactate concentrations during the Wingate anaerobic test were significantly changed from rest(male:2.4 mmolㆍL, female:1.9 mmolㆍL) to 5 min recovery (13.7 mmolㆍL, 11.6 mmolㆍL) for both male and female athletes. The average exercise intensity during poomsae competition were 140 beat/min in both male and female. These findings indicate that male taekwondo poomsae athletes showed higher aerobic and anaerobic capacity than those of female athletes. This study provide coaches and physical trainers to design specific physical conditioning programs for their athletes.