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박수원(Su-Won Park),장수미(Soo-Mi Jang),최병환(Byoung-Hwan Choi),손한나(Han-Na Son),박봉찬(Bong-chan Park),김창환(Chang-Hwan Kim),손장호(Jang-Ho Son),성일용(Iel-Yong Sung),이지호(Ji-Ho Lee),조영철(Yeong-Cheol Cho) 대한구강악안면외과학회 2010 대한구강악안면외과학회지 Vol.36 No.5
Introduction: Bone density is one of the important factors for the long term success of endosseous implants. The bone density varies from site to site and from patient to patient. A preoperative evaluation of the bone density is quite useful to oral surgeons for planning dental implantation. More accurate information on the bone density will help surgeons identify suitable implant sites, thereby increase the success rate of dental implantation. This study examined the correlation between the bone density measured preoperatively by computed tomography (CT) and the implant primary stability measured by resonance frequency analysis. Furthermore, the effects of the implant sites, gender, age and generalized systemic disorder patients on the bone density and primary implant stability were examined. Materials and Methods: One hundred and fourteen patients were selected. None of the patients had undergone a tooth extraction or bone graft history in the previous year. Preoperatively, the patients underwent CT scanning to evaluate the Hounsfield unit (HU), and resonance frequency analysis(RFA) was used to evaluate the implant primary stability at the time of implant installation. All implants were 4.0 mm diameter and 11.5 mm length US II. All patients were recorded and the HU and implant stability quotient (ISQ) value were evaluated according to the sites, gender and age. Results: The highest HU values were found in the mandibular anterior site (827.6±151.4), followed by the mandibular molar site (797±135.1), mandibular premolar site (753.8±171.2), maxillary anterior site (726.3±154.4), maxillary premolar site (656.7±173.8) and maxillary molar site (621.5±164.9). The ISQ value was the highest in the mandibular premolar site (81.5±2.4) followed by the mandibular molar site (80.0±5.7), maxillary anterior site (77.4±4.1), mandibular anterior site (76.4±11.9), maxillary premolar site (74.2±14.3) and maxillary molar site (73.7±7.4). The mean HU and ISQ value were similar in females and males. (HU: P=0.331, ISQ: P=0.595) No significant difference was also found in the age group respectively. However, the correlation coefficients between the variables showed a closed correlation between the HU and ISQ value. Conclusion: These results showed close correlation between the bone density (HU) and primary stability value (ISQ) at the time of implant installation(Correlation coefficients=0.497, P<0.01). These results strengthen the hypothesis that it might be possible to predict and quantify the initial implant stability and bone density from a presurgical CT diagnosis.
박수강(Su-Kang Park),이시영(Si-Young Lee),최한석(Han-Seuk Cho),차지훈(Ji-Hun Cha),이병영(Byung-Young Lee),박기정(Ki-Jeong Park),황인호(In-Ho Hwang) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
최근들어, 유비쿼터스 기술을 활용한 유헬스케어의 료기기에 대한 개발이 증가하고 보급 및 사용자가 늘고 있다. 이러한 유헬스케어의료기기는 개인이 주로 사용하며 병원용의료기기와 달이 열악한 사용환경에 노출되어 사용되고 있고 이러한 환경에 대한 안전관리가 취약한 사용대상에 의해 사용되어진다. 본 연구에서는 유헬스케어의료기기의 사용환경 안전성에 대한 시험평가방법을 연구하였다.
박수한(Su Han Park),서현규(Hyun Kyu Suh),김형준(Hyung Jun Kim),이창식(Chang Sik Lee) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The aim of this study is to investigate the atomization characteristics of biodiesel-ethanol blending fuel in a common-rail diesel injector. Test fuels used in this work are a diesel, neat biodiesel and a biodiesel with 20% ethanol as volumetric rate. Test injector that applied in this study has a single hole with a diameter of 0.3㎜ and a nozzle length of 0.8㎜. Sauter mean diameter (SMD), the axial and radial velocity distribution are measured to investigate the atomization characteristics of ethanol-biodiesel blending fuel using the droplet measuring system. It was also analyzed a injection quantity and injection rate characteristics of each test fuel under the same experimental coniditions. It was founded that unlike the diesel fuel, biodiesel fuel is well mixed with ethanol and the degree of dissolution stability is a high in a room temperature. The ethanol blending fuel has a lower droplet size than that of biodiesel fuel. The axial velocity distribution of blending fuel has a larger than that of biodiesel fuel and a lower than that of diesel fuel. The radial velocity distribution has a contrary characteristic compared to the axial velocity distribution.