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지르코니아의 거칠기 증가를 위한 다양한 표면처리방법이 레진 시멘트와의 전단결합강도에 미치는 영향
배강호,배지현,허중보,최재원 대한치과기공학회 2020 대한치과기공학회지 Vol.42 No.4
Purpose: The purpose of this study was to evaluate the effects of various zirconia surface treatment methods on shear bond strength with resin cements. Methods: We prepared 120 cylindrical zirconia specimens (⌀10 mm×10 mm) using computer- aided design/computer-aided manufacturing (CAD/CAM). Each specimen was randomly subjected to one of four surface treatment conditions: (1) no treatment (control), (2) airborne-particle abrasion with 50 μm of Al2O3 (A50), (3) airborne-particle abrasion with 125 μm of Al2O3 (A125), and (4) ZrO2 slurry (ZA). Using a polytetrafluoroethylene mold (⌀6 mm×3 mm), we applied three resin cements (Panavia F 2.0, Super-Bond C&B, and Variolink N) to each specimen. The shear bond strength tests were performed in a universal testing machine. The surfaces of representative specimens of each group were evaluated under scanning electron microscope. We used one-way analysis of variance (ANOVA), two-way ANOVA, and post hoc Tukey honest significant difference test to analyze the data. Results: In the surface treatment method, the A50 group showed the highest bond strength, followed by A125, ZA, and control groups; however, no significant difference was observed between A50 and A125, A125 and ZA, and ZA and control (p>0.05). Among the resin cements, Super-Bond C&B showed the highest shear bond strength, followed by Panavia F 2.0 and Variolink N (p<0.05). Conclusion: Within the limitations of this study, application of airborne-particle abrasion and ZrO2 slurry improved the shear bond strength of resin cement on zirconia.
Analyses of Plantar Foot Pressure and Static Balance According to the Type of Insole in the Elderly
배강호,신진형,이중숙,양정옥,이범진,박승범 한국운동역학회 2016 한국운동역학회지 Vol.26 No.1
Objective: The purpose of this study was to investigate plantar foot pressure and static balance according to the type of insole in the elderly. Methods: Thirteen elderly (mean age: 67.08±2.25 years, mean height: 159.63±9.64 cm, mean body weight: 61.48±9.06 kg) who had no previous injury experience in the lower limbs and a normal gait pattern participated in this study. Three models of insoles of the normal, 3D, and triangle types were selected for the test. The Pedar-X system and Pedar-X insoles, 3.3 km/h of walking speed, and a compilation of 20 steps walking stages were used to analyze foot-pressure distribution. Static balance test was conducted using Gaitview AFA-50, and balance (opening eyes, closing eyes) was inspected for 20 s. One-way ANOVA was conducted to test the significance of the results with the three insoles. P-value of less than .05 was considered statistically significant. Results: The mean foot pressure under the forefoot regions was the lowest with the 3D insole during treadmill walking (p<.05). The mean value under the midfoot was the highest with the 3D insole (left: p<.05, right: p<.01). The mean value under the rearfoot was the lowest with the 3D insole (p<.001). The maximum foot pressure value under the foot regions was the lowest on both sides of the forefoot with the 3D insole. A statistically significant difference was seen only in the left foot (p<.01). The maximum value under the midfoot was the highest with the 3D insole (p<.001). No statistically significant difference was detected on the values under the rearfoot. In the case of vertical ground reaction force (GRF), statistically significant difference was seen only in the left side rearfoot (p<.01). However, static balance values (ENV, REC, RMS, Total Length, Sway velocity, and Length/ENV) did not show significant differences by the type of insole. Conclusion: These results show that functional insoles can decrease plantar pressure and GRF under the forefoot and rearfoot. Moreover, functional insoles can dislodge the overload of the rearfoot and forefoot to the midfoot. However, functional insoles do not affect the static balance in the elderly.
갑상선 유두암 T1, T2 병기 환자에서 중앙경부 림프절 전이의 빈도와 예측인자
배강호,태순영,고병균,김연선,Kang Ho Bae,Soon Young Tae,Byung Kyun Ko,Yon Seon Kim 대한갑상선-내분비외과학회 2015 The Koreran journal of Endocrine Surgery Vol.15 No.1
Purpose: Thyroidectomy without prophylactic central neck dissection may be recom-mended for small (T1 or T2) papillary thyroid carcinoma (PTC). The aim of this study was to determine the incidence and predictive factors of central cervical lymph node metastasis in T1/2 papillary thyroid carcinoma.Methods: A retrospective review of 877 patients with T1/2 PTC who underwent thyroidectomy and central lymph node dissection with or without lateral lymph node dissection from March 2007 to February 2014 was performed. The clinicopathologic results were reviewed and the incidence and predictive factors of central cervical lymph node metastasis (LNM) were analyzed.Results: The overall frequency of central LNM was 29.8%. In univariate analysis, male, younger age, bilaterality, multifocality, larger tumor size, lymphovascular invasion, and lateral lymph node metastasis were associated with central LNM. In multivariate analysis, younger age, larger tumor size, lymphovascular invasion, and lateral lymph node metastasis were independent variables of central LNM.Conclusion: Central LNM is associated with younger age, larger tumor, lymphovascular invasion, and lateral lymph node metastasis in small (T1/2) PTC patients. Prophylactic central lymph node dissection should be considered in patients with risk factors.
확산 보정을 통한 OMI 이산화질소 기주농도의 검증 결과 보정
배강호,송창근 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
위성관측은 지상 원격 관측에 비해 넓은 관측 범위를 가지고 있어 대기오염물질의 장거리 이동 특성, 장기경향성 분석, 배출원 추적 등의 연구에서 유용하게 사용되고 있다. 또한, 현재 운영되고 있는 극궤도 위성의 관측시간의 한계를 보완하기 위해 우리나라는 2020년 2월 정지궤도 환경위성 GEMS (Geostationary Environmental Monitoring Spectrometer)를 발사하였다. 그러나 최근에 보고된 Pandora를 이용한 위성 NO₂ 기주농도 검증 결과를 보면, 특히 고농도 지역에서 위성이 크게 과소모의하는 현상을 보인다. 이 문제의 원인으로는 크게 위성의 넓은 FOV (Field of View), AMF (Air Mass Factor)의 불확실성 등의 요인이 제기되었다. 본 연구에서는 낮은 공간해상도에서 발생하는 문제에 초점을 맞추어 위성보다 조밀한 공간해상도를 가진 화학수송모델의 결과를 이용한 확산보정을 통하여 울산(UNIST)과 부산(부산대학교)의 판도라 관측소에서의 검증 결과를 개선시키고자 하였다. 위성자료는 OMI (Ozone Monitoring Instrument)의 OMNO2 자료를 이용하였고, 국립환경과학원의 미세먼지 예보 현업모델 결과를 이용하여 보정을 진행하였다. 보정 결과 울산과 부산에서 모두 개선을 보였으나, 부산의 경우 지표 풍향과 모델의 풍향 모의 정확도에 따라 보정 효과가 크게 달라졌다. 이를 통해 효과적으로 보정을 적용하기 위해서는 모델의 풍향 모의 정확도와 해당 지역의 배출원 분포에 대한 이해도가 요구됨을 알 수 있었다.
열역학법 효율시험을 활용한 50MW급 수력플랜트 현대화 평가
배강호(Kang-Ho Bae),조용(Yong Cho),김용열(Yong-Yeul Kim) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
This study modernizes the runner of a Hapcheon hydropower plant installed with a vertical Francis turbine with a rated head of 95 m, measures and compares the field efficiency before and after the modernization, and verifies how much influence the runner has on the efficiency of the turbine. the same field test was performed using the thermodynamic method, which is a test applicable to turbines exceeding 100 m head according to IEC 60041. The turbine of the old runner was measured at 93.21% as the highest efficiency point under the condition of a head 113.0 m and an output of 51.6 MW. The turbine of the new runner was measured at a highest efficiency of 94.20% despite the worse condition of the head 117.62 m. the efficiency improved by about 0.99%p, which was effective improvement by reducing the loss by about 15% from 6.79% to 5.8%. In both tests, the absolute uncertainty about the turbine efficiency was measured at 0.73% and 0.66%, resulting in a reliable test.