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객체 중심 계층적 계획을 이용한 뇌경색 환자의 시기별 MRI 정량적 분석에 관한 연구
하광,전계록,김길중,Ha, Kwang,Jeon, Gye-Rok,Kim, Gil-Joong 대한의용생체공학회 2003 의공학회지 Vol.24 No.2
본 논문에서는 의학적 진단 및 처치 방법의 결정에 중요한 역할을 하는 뇌경색 환자의 각 시기별 특징을 정량화하기 위해 3 가지 MRI 촬영기법을 이용하여 획득한 영상의 특징과 그들의 상관관계들을 객체중심 계층적계획기법을 이용하여 분석하였다. 3 가지 영상의 비교를 위하여 다항워핑 알고리즘과 어파인 변환기법을 수행하여 영상을 정합하였으며, 정합된 영상을 기반으로 뇌경색 시기별 정량화를 수행하였다. 그리고 각 시기별로 색을 설정하여 수 작업으로 얻어진 데이터를 바탕으로 의사 컬러로 나타내었다. 본 연구에서 구한 뇌경색 시기별 정량화 자료를 바탕으로 구분된 결과와 전문의가 판단한 결과를 비교하였다. This paper presents a quantitative analysis method for fall in sick times of the cerebral infarction patients using three types of magnetic resonance image, which play an important role in deciding method of medical treatment. For this object, image characteristics obtained by three radiographic methods of MRI and their relation were analyzed by means of object centered hierarchical Planning method. This methode presents an approach to the knowledge based processes for image interpretation and analysis. To compare three type of MRI. a multiple warping algorithm and affine transform method performed for image matching. Then each fall in sick times level of cerebral infarction was quantified and pseudo-color mapping performed by comparing gray level value one another according to Previously obtained hand maid data. The result of this study was compared to a medical doctors decision.
Pt-MnOx/ZrO2-SiO2 촉매에서 수소에 의한 일산화질소의 선택적 촉매 환원반응
김주영 ( Ju Young Kim ),하광 ( Kwang Ha ),서곤 ( Gon Seo ) 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.4
지르코니아를 고정한 실리카(ZrO2-SiO2)와 망가니즈 산화물(MnOx)에 백금을 담지하여 제조한 촉매에서 수소에 의한 일산화질소의 선택적 촉매 환원(H2-SCR) 반응을 조사하였다. Pt-MnOx 촉매에서는 NO 전환율이 낮으며, N2O와 NO2생성이 억제되었다. 반면, Pt/ZrO2-SiO2 촉매에서는 NO 전환율이 높지만, 100~150 ℃에서는 N2O가, 200~300 ℃에서는 온도가 높아지면 NO2 수율이 높아져, N2 수율이 낮았다. ZrO2-SiO2에 MnOx와 백금을 같이 담지한 Pt-MnOx/ZrO2-SiO2 촉매에서는 100~150 ℃에서 이들 성분의 상승작용으로 N2 수율이 조금 높아졌다. 이들 촉매에서 표면 조성, 산화 상태, 산성도를 조사하고, NO가 흡착되어 수소와 반응하는 과정의 IR 스펙트럼을 그렸다. NO의 H2-SCR 반응에서 전환율과 생성물 수율을 촉매 구성 성분의 촉매작용과 연계지어 고찰하였다. Selective catalytic reduction of nitrogen monoxide by hydrogen (H2-SCR of NO) over platinum catalysts impregnated on zirconia-incorporated silica (ZrO2-SiO2) and manganese oxide (MnOx) was investigated. Pt-MnOx catalyst showed low conversions and low yields of N2O and NO2 at 100-350 ℃. On the other hand, NO conversions over Pt/ZrO2-SiO2 were very high, but N2O was predominantly produced at 100-150 ℃ and the yield of NO2 increased with temperature at 200-300 ℃, resulting in poor N2 yields. Pt-MnOx/ZrO2-SiO2 exhibited a small enhancement in N2 yield at 100-150 ℃ due to the synergy of MnOx and ZrO2-SiO2. The surface composition and oxidation state of the catalyst components and the acidity of the catalysts were examined. IR spectra of the adsorption of NO and their subsequent reactions with hydrogen on these catalysts were also recorded. The variations of conversion and product yield according to the catalyst components in the H2-SCR of NO were discussed in relation to their catalytic roles.
폴리비닐실록산 치과용 고무인상재의 친수성 향상을 위한 계면활성제의 응용과 물성에 미치는 영향
박영준 ( Yeong Joon Park ),황문진 ( Moon Jin Hwang ),김민강 ( Min Kang Kim ),송호준 ( Ho Jun Song ),하광 ( Kwang Ha ),강신영 ( Shin Young Kang ) 한국고무학회 2008 엘라스토머 및 콤포지트 Vol.43 No.2
This study was purposed to investigate the effects of surfactants and fillers on physical properties of hydrophilic polyvinylsiloxane dental impression materials (PVS). Incorporation of surfactants enhanced the hydrophilicity of the PVS, however, it induced increased viscosity and permanent deformation ratio, delayed setting, and decreased tensile strength. At high concentrations of surfactant, the tensile strength was observed to decrease significantly due to the internal pore formation. Especially, the hydrophilicity of the PVS was significantly enhanced with the addition of Silwet L-77. However, the viscosity, strain in compression, pore formation, and setting time increased whereas the elastic recovery rate and strength remarkably decreased. The PVS dental materials containing Span 20 showed the lowest degree of viscosity increase, delayed setting, pore formation, and hydrophilicity. The delayed setting, pore formation, and strength decrease caused by the incorporation of surfactant were improved by substituting the crystalline quartz filler with diatomaceous earth while the contact angle of PVS dental materials increased.
위암수술 환자에서의 cp 개발과 cp적용에 따른 질 향상 활동에 관한 연구
임은주,황순휘,박도중,하광일,배현주,김형호 한국의료QA학회 2006 한국의료질향상학회지 Vol.13 No.2
Background : In an era of increasing medical costs, safe reduction in postoperative stay has become a major focus to optimize utilization of healthcare resources. The authors aimed to evaluate the clinical significance of the critical pathway(CP) for gastrectomy patients by implementing standardized postoperative management and electronic medical records. Method : From August 2006 to April 2007, critical pathways were introduced to inpatients and outpatients with gastric cancer. 60 consecutive patients undergoing distal gastrectomy were randomly divided into two groups; 30 CP group(A) and 30 non-CP group(B). Simultaneously, we also retrospectively reviewed the records of 438 patients(C:control group) who were able to be enrolled in CP program. We compared group(A) with (B), (C) in terms of hospital stay, complication rate, use of antibiotics and hospital costs. Patient satisfaction was surveyed by questionnaires. Result : There was no significant demographic difference between group(A) and (B). Of 30 patients in group(A), 5 drop-outs and 14 variances occurred. The mean postoperative hospital stays(Laparoscopy-assisted distal gastrectomy: LADG/Open distal gastrectomy: ODG) were 7.6/10.5 days for the group(A), 8.9/12.7 days for the group(B) and 12.6/14.5 days for the group(C) (p=0.02 in LADG). The total hospital cost of group(A) had a tendency to be less than that of group(B) and the amount of hospital cost per day in group(A) was significantly higher than that in group(B). The usage rates of the first generation antibiotics were 73.33%, 63.33%, and 59.2% in group(A), (B), and (C), respectively. Patients’ satisfaction had a tendency to be higher in the CP group than non-CP group. Conclusion : The mean hospital stay in LADG patients was shortened meaningfully and hospital cost per day was enlarged after introduction of clinical pathway. It is necessary to apply a number of patients to the critical pathway and to make an effort to reduce the variation and drop-out rates.