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친수성, 통기성 및 항균성이 향상된 고분자-세라믹 복합소재의 제조 및 물성
조형준,정동운,Cho, Hyung-Joon,Jung, Dong-Woon 대한화학회 2010 대한화학회지 Vol.54 No.1
일반적으로 고분자 재질은 표면이 수분을 배척하는 소수성이며 또한 통기성이 좋지 못하다. 이러한 물성을 개질하기 위하여 고분자 플라스틱에 기능성 충전제로 친수성인 세라믹 입자와 항균입자를 혼합하여 친수성, 통기성 및 항균성이 향상 된 복합재료를 제조하였으며 표면 접촉각 측정, 공기투과시간 측정, 항균효과 관찰을 통해 물성을 확인하였다. 이러한 복합 재료는 건강관련 제품에 널리 이용될 수 있다. Generally, polymer materials are not air-permeable and hydrophilic. In addition, they do not possess anti-fungal property. Hydrophilicity, air-permeability, and anti-fungal properties of new composites consisting of polymer, ceramic nanoparticles, and silver ion were investigated by contact angle measurements, air permeation time, and cell culture. The hydrophilic, air-permeable, and anti-fungal composites can be used in health care industry.
팔단금 도인 운동이 고혈압에 미치는 영향 : 체계적 문헌 고찰
조형준,배동렬,김희나,황의형,Cho, Hyung-Joon,Bae, Dong-Ryeol,Kim, Hee-Na,Hwang, Eui-Hyoung 척추신경추나의학회 2017 척추신경추나의학회지 Vol.12 No.1
Objectives : To determine the effectiveness of Baduanjin for hypertension Methods : We searched 8 electronic databases(Pubmed, CAJ, EMBASE, Cochrane Library, KISS, KISTI, NDSL, RISS) up to April 2017. We included randomized controlled trials(RCTs) using Badanjin for hypertension. The methodological quality of each RCT was assessed by the Cochrane risk of bias tool. Results : 14 RCT studies were eligible in our review. 14 studies were divided into 4 groups, and 2 of them were meta-analysised. The meta-analysis of 10 studies showed favorable results for the use of Baduanjin with Usual care than Usual care. But, meta-analysis of 2 studies showed Baduanjin and Usual care has no difference. High risk of bias were observed in all studies. Conclusions : Although there are favorable results with meta-analysis, our systematic review are highly dependent on the single source of Chinese electrical database, CAJ. Now limited evidence is available to support Baduanjin combined usual care for hypertension and further well-designed RCTs should be encouraged.
한국 고령 인구에서 방사선학적 평가에 의한 슬관절 퇴행성 관절염의 유병률
조형준 ( Hyung Joon Cho ),장종범 ( Chong Bum Chang ),정재욱 ( Jae Wook Jung ),성상철 ( Sang Cheol Seong ),김태균 ( Tae Kyun Kim ) 대한슬관절학회 2009 대한슬관절학회지 Vol.21 No.4
Purpose: This study was conducted to investigate the epidemiologic characteristics of knee osteoarthritis (OA) in elderly Koreans with respect to its detailed prevalence and association with demographic factors such as gender, age and body mass index (BMI). Materials and Methods: Six hundred and ninety six subjects (men 298 and women 398) aged 65 years or older were recruited from an urban population. Radiographic evaluations were conducted using three plain radiographs (weight bearing anteroposterior view, 45 degree of flexion posteroanterior view, and the Merchant view). Radiographic severity was determined using the Kellgren-Lawrence (K/L) grading scale and radiographic OA was defined as K/L grade 2 or higher. Overall prevalence of OA was analyzed with regard to gender, age and BMI using multivariate logistic regression. Results: The overall prevalence of knee OA in the study cohort was 38.1%. Women had the much higher prevalence of knee OA than men (53.8% vs. 17.1%). Female gender, obesity and ageing were associated with the risk of knee OA, but a female gender was found to be the strongest predictor for knee OA. Conclusion: This study documents that knee OA is highly prevalent among Korean elderly, and that elderly Korean women are at much greater risk of development of knee OA. It is hoped that our findings provide information that aids the creation of national health policies that better target the prevention and treatment of knee OA.
추나요법이 턱관절 증후군에 미치는 영향: 체계적 문헌 고찰
배동렬 ( Dong-ryeol Bae ),조형준 ( Hyung-joon Cho ),김희나 ( Hee-na Kim ),황의형 ( Eui-hyoung Hwang ) 대한한의학회 한방재활의학과학회 2017 한방재활의학과학회지 Vol.27 No.3
Objectives To determine the effectiveness of Tuina for temporomandibular joint disorder. Methods We searched 10 electronic databases (Pubmed, CNKI, EMBASE, Cochrane Library, KISS, KISTI, NDSL, RISS, KMBASE, DBpia) up to May 2017. We included randomized controlled trials (RCTs) using Tuina for temporomandibular joint disorder. The methodological quality of each RCT was assessed by the Cochrane risk of bias tool. Results 14 RCT studies were eligible in our review. 14 studies were divided into 4 groups, and meta-analysised. The meta-analysis of 6 studies showed favorable results for the use of Tuina. High risk of bias were observed in 9 studies. Conclusions Although there are favorable results with meta-analysis, our systematic review are highly dependent on the single source of Chinese electrical database, CNKI. Now limited evidence is available to support Tuina for temporomandibular joint disorder and further well-designed RCTs should be encouraged. (J Korean Med Rehabil 2017; 27(3):71-79)
전진규 ( Jin Q Jeon ),조형준 ( Hyung Joon Cho ) 명지대학교 금융지식연구소 2018 금융지식연구 Vol.16 No.2
본 연구에서는 공매도가 기업내부자의 지분매도에 영향을 미치는지에 대하여 분석하였다. 내부자가 부정적 기업정보를 가지고 있을 경우 공매도의 증가는 부정적 정보의 전파와 수익률의 추가하락을 우려하는 내부자의 지분매도 행위를 가속화시킬 수 있다 (Massa, Qian, Xu, and Zhang, 2015). 내부자의 범위를 최대주주 및 5% 이상 대주주, 그리고 5%로 미만을 소유하고 있는 임원으로 한정하고, 위의 가설을 검증한 결과 전체기업 표본에서 공매도율이 높아질수록 최대주주, 10%이상, 5-10%를 소유한 주주의 지분율이 유의하게 감소하는 것으로 나타났다. 시장별 분석에서 상대적으로 기업연혁이 길고 안정적인 KOSPI 시장 기업들의 주주들이 덜 민감하게 반응하는 것으로 나타났다. 본 연구는 국내 시장을 대상으로 공매도와 내부자 매도의 행태를 최초로 분석하였다는데 의의가 있다. 다만 국내 데이터베이스에서 획득 가능한 1년 평균 공매도율 및 지분율을 사용함으로서 두변수 간 시계열적 특성 등 보다 세밀한 분석을 수행하지 못한 점은 연구의 한계점이며 이에 따라 결과의 해석에도 주의가 필요하다. In this study, we investigate the effect of short selling on equity sales by corporate insiders. If insiders have negative information on the future of firms, an increase in short sales may accelerate sell-offs by insiders who are concerned with the spread of negative information as well as a further decline in their stock prices. We define the corporate insiders by 4 categories: Largest shareholders, shareholders holding more than 10%, shareholders holding 5 to 10% and executives holding less than 5%. The results of the whole sample analysis show that short sales significantly reduce the ownership of largest shareholders and shareholders with more than 10% as well as with 5 to 10%. We also find that insiders of KOSPI listed firms are less sensitive to those of KOSDAQ firms, which suggests that KOSPI firms are older and more stable. This paper contributes to literature in that it is the first study to examine short selling and behaviors of corporate insiders in the Korean market. However, since we use the 1-year average short selling ratio and ownership data currently available in the domestic database, it is not possible to perform more detailed analysis on time-series characteristics of those two variables.
김명수(Myoung Soo Kim),문규필(Kyu Pill Moon),조형준(Hyung Joon Cho),배정연(Jung Yun Bae),서근택(Keun Tak Suh) 대한정형외과학회 2010 대한정형외과학회지 Vol.45 No.6
전완부에 다발성 골절과 탈구가 발생한 환자에서 드물게 발생한 주두 골절과 척골의 간부 분절 골절을 치료하는 데에 있어서 추천할만한 치료 방법은 주두부의 해부학적 특성을 이용하여 합병증을 최소화하는 긴장대 강선 고정술과 골수강 내 금속정 고정술로 사료되어 이를 시행하고 좋은 결과를 얻어 보고하고자 한다. We would like to report a case of treating a segmental fracture of ulnar shaft, with a concomitant olecranon fracture. The patient was treated using tension band wiring and intramedullary nailing procedures Based on the nature of the olecranon, we believe this should be a recommended treatment method that minimizes complications for the patient that has multiple fractures and a dislocation of the forearm.