http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
조핵제 원료에 따른 Li<sub>2</sub>O-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>계 결정화 유리 특성
박현욱,이지선,임태영,황종희,라용호,노명래,서관희,김진호,Park, Hyun-Wook,Lee, Ji-Sun,Lim, Tae-Young,Hwang, Jonghee,Ra, Yong-Ho,Noh, Myoung-Rae,Seo, Kwan-Hee,Kim, Jin-Ho 한국결정성장학회 2018 한국결정성장학회지 Vol.28 No.6
조핵제 역할을 하는 지르코늄의 원료로써 $ZrO_2$(지르코늄 옥사이드), $ZrSiO_4$(지르코늄 실리케이트), $ZrOCl_2$(지르코늄 옥시클로라이드), $Zr(SO_4)_2$(지르코늄 서페이트) 4종류의 원료를 사용하여 $Li_2O-Al_2O_3-SiO_2$계 결정화 유리를 제조하였다. 동일한 조성의 모든 유리에서 Avrami 상수는 3 이상으로 체적 결정화가 진행됨을 확인하였다. 또한 $ZrOCl_2$, $Zr(SO_4)_2$를 사용하여 제조한 유리는 용융 과정에서 미용융물이 발생하지 않으며 지르코늄 성분이 균일하게 분포되었음을 확인하였다. 이와 같은 결과를 성분 분석, 굽힘 강도를 연계하여 평가하였다. The glass-ceramic of $Li_2O-Al_2O_3-SiO_2$ system was synthesized by using $ZrO_2$, $ZrSiO_4$, $ZrOCl_2$ and $Zr(SO_4)_2$, which is a raw material of Zr serving as a nucleation agent. It was confirmed that Avrami parameter of these four glasses is over 3 for bulk crystallization. The glass synthesized by $ZrOCl_2$, and $Zr(SO_4)_2$ showed high melting quality during the melting process. It is also observed that the Zr component is uniformly distributed in the glass. Various characterizations was evaluated, including composition analysis and bending strength.
박현욱,김동재,Park, Hyun-Wook,Kim, Dong-Jae 한국통계학회 2009 Communications for statistical applications and me Vol.16 No.1
단순선형 회귀모형의 기울기에 대한 평행성 검정법을 제안하였다. 세 군 이상에서 기울기에 대하여 Tukey (1953)가 제안한 HSD방법을 이용한 모수적 검정법과 Kruskal-Wallis (1952) 검정법을 이용한 비모수적 검정법을 각각 제안하였다. 또한 모의실험을 통하여 기존의 검정법과 제안한 검정법의 검정력을 비교하였다. Parallelism tests are proposed for slope in the simple linear regression models. In this paper, we suggest the parametric test using HSD testing method (Tukey,1953) and distribution-free test using Kruskal-wallis (1952) for more than three slopes. Monte Carlo simulation study is adapted to compare the power of the proposed methods with Wilks' Lambda multivariate procedure.
박현욱,류동목,이한주,허원실,Park, Hyun-Wook,Ryu, Dong-Mok,Lee, Han-Joo,Huh, Won-Shil 대한악안면성형재건외과학회 1999 Maxillofacial Plastic Reconstructive Surgery Vol.21 No.2
The purpose of this study is to evaluate the effects of resorbable plate in the healing process of mandibular fracture. Reduction and rigid fixation was carried out on the artificial mandibular fracture site of the rabbits, using a resorbable screw, 1.5mm in diameter and 4.0mm in length, and an absorbable plate 1.5mm in thickness(Lactosorb$^{(R)}$). En block tissue specimens with plate were taken from the rabbits at 4, 6, 8, and 10 weeks intervals and specimen were observed with light microscope under the hematoxylin-eosin staining, to observe the inflammatory reaction and tissue healing process. The following conclusions were drawn: 1. The subject displayed good healing with no signs of detachment of the fixation plate. 2. At 4 weeks, the plate was covered by the connective tissue. Then at 6 weeks, bone regeneration was discovered around the plate. 3. During the period of healing, no inflammatory reaction or foreign body reaction, as a result of using resorbable plate, were observed. 4. At 8 weeks, the initial phase of the absorption of the plate was observed. Then at 10 weeks, macrophage were observed around the plate, indicating the absorption phase was in process. From the above results, it can be determined that when the resorbable plate is applied to rabbit, full recuperation occurs naturally in the absence of inflammatory reaction and foreign body reaction. The selected study is clinically valuable in proving this procedure.
AC-PDP의 ADS 구동방법에 적합한 고효율 에너지 회수회로에 관한 연구
박현욱(Hyun-Wook Park),강필순(Feel-Soon Kang),박성준(Sung-Jun Park),김철우(Cheul-U Kim) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
본 논문에서는 AC-PDP 구동에 있어 효율적이며, 패널 전압을 빠르게 상승시킬수 있어 현재 많이 이용되는 ADS 구동 방식에 적합한 에너지 회수 회로를 제안한다. 제안된 회로는 기존의 LC 순수 공진의 방식을 적용하여 에너지를 회수하는 방식 Weber 회로와 비교하여 제한적인 유지 기간 동안 동작 여유 마진을 증가실킬수 있고, 픽셀의 ON.OFF 상태와 상관없이 효율을 증가시킬수 있다. 제안하는 회로를 기존의 Weber 회로와 비교하여 동작원리와 특징들을 분석하고, 75인치 PDP 시작품을 이용하여 제안하는 회로의 타당성과 우수성을 검증하였다.
동결보호제의 종류에 따른 냉동보관자가골의 골형성능에 대한 연구
박현욱(Hyun-Wook Park),이백수(Baek-Soo Lee) 대한구강악안면외과학회 2005 대한구강악안면외과학회지 Vol.31 No.3
Purpose: Several cryoprotectants are in use to help the survival of cells during cryopreservation of bone in maxillofacial region. Among them, Me2SO(dimethyl sulfoxide), EG(ethylene glycol), sucrose were used for experimentally created defects with accompanying cryopreserved bone graft in the rabbit model. The aim of this study is to analyze the effect of above mentioned agents on bone formation using histologic and histomorphometrical methods, thus to provide experimental support for clinical application of these agents. Materials and methods: Nine rabbits were used as experimental animals. Surgical defects were created on the distal femoral heads and mesial tibial heads of each animal using trephine drill(5mm diameter and 5mm length). The harvested bones were cryopreserved in -80℃ refrigerator for one week. The defects were filled with cryopreserved bone with cryoprotectants as experimental groups and cryopreserved bone without cryoprotectant as control. Then, the animals were sacrificed at 1, 2, and 3 weeks after surgery. With Goldner’s modified Masson trichrome staining and semiautomatic image analysis system, we observed the change of the cells and bone formation. Results: After bone graft, bone formation and active remodeling process were examined in all experimental groups and the control. But the intensity of such activities of the control were somewhat weaker than that of the experiments. Especially Me2SO+sucrose group was the best in bone formation and bone remodeling. Me2SO group was more than that of EG group in bone fomation. Sucrose seems to be helpful in survival of the bone cell. Histologic findings showed superior bony quantity and quality in experimental groups than that in control. Conclusions: The data from this study provides the basis for future studies for evaluating the effect of cryoprotectants in the cryopreservation of bone and clinical study for predictable use of these agents.
박현욱 ( Park Hyun-wook ) 한국융합과학회 2018 한국융합과학회지 Vol.7 No.3
연구목적: 2014년 시행되어 2018년까지 웹보드 게임 규제 정책의 변동과정을 기사 검색을 통해 자료수집하였다. 다양한 요인들의 복잡성과 비선형성을 보다 정확하게 이해할 수 있는 시스템 사고를 적용해 분석하였다. 연구방법: 시스템 사고를 위한 자료들의 시간적 범위는 웹보드 게임 규제안이 시행된 2014년 2월23일부터 2번의 재검토가 끝난 시점인 2018년 6월30일까지로 하였다. 기사 검색은 “웹보드게임”이란 키워드로 전자신문에서 검색하였다. 그 결과 52건의 기사가 도출되어 이를 중심으로 분석하였다. 인과지도는 Vensim 6.3을 이용하여 작성하였다. 결론: 사행성 방지라는 건전한 의도에서 제정된 웹보드 게임 규제가 직접적인 매출 감소와 시장 축소 등 게임산업에 영향을 미치게 된 것을 확인하였다. 웹보드 규제가 시행되고 4년 동안 규제 완화와 유지라는 두 번의 정책 재검토를 거쳤다. 그러나 웹보드 게임 시장의 회복은 쉽지 않았다. 또한, 정책의 불확실성으로 인하여 모든 상황을 예측하여 제정 및 시행하기는 어렵다. 하지만 한번 시행된 정책을 다시 보완하고 수정하기까지는 시간이 걸리고, 이미 영향을 받은 산업의 변화가 어렵다는 것을 확인하였다. Pupose: The purpose of this study is to analyze the change of web board game regulation policy through article search and system thinking for four years from 2014. Methods: The time range for system accident data is from 23 February 2014 when the web board game regulation was enforced until 30 June 2018, when two reviews were completed. The topic of articles was ' Web board game ' and 52 articles were found in ' The Electronic Times '. Causal maps were created using Vensim 6.3. Conclusion: Web board game regulations introduced by the sound intention of gambling prevention have affected the game industry, including direct decrease in sales and market reduction. To reduce the impact of Webood game regulation, the government has been reviewing and revising policies for four years and two times. However, the recovery of the Internet game market is not easy. This is the importance of this research that we can identify through system thinking. Policy uncertainty makes it difficult to predict and realize all situations and makes it difficult to change industries already affected.