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박가람,박균영,주지선,박준택 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.4
전산유체 계산 프로그램 중 하나인 CFX4를 이용하여 직경 140㎝, 높이 170㎝의 회전원반 분무건조기에서 우유를 대상으로 하여 분무실 내 유체흐름 분포, 액적의 거동, 건조 현상 등을 예측해 보았다. 분무실 내의 유체는 아래쪽이 좁아지는 구조로 인하여 중심에서 내려와서 벽 쪽으로 올라가는 커다란 재 순환 영역을 형성하였다. 기체장 내에 액적이 분무됨으로써 유체의 흐름에 상당한 영향을 주는 것을 알 수 있었다. 액적이 재 순환 영역으로 들어가지 않을 만큼 가벼운 경우는 중심에서 크게 벗어나지 않고 아래로 떨어졌고 조금 더 무거운 것은 재 순환 영역을 따라 움직였다. 이 보다 더 질량이 클 경우 유체 흐름에 큰 영향을 받지 않고 아래쪽으로 이동하였다. 선회를 주기 위해 공기분산기의 베인 각도를 0˚, 30˚, 45˚로 변화시킴에 따라 유체의 재 순환 영역이 위쪽으로 이동하였다. 베인 각도가 커지면 선회 강도가 증가하여 액적이 상부에서 원을 크게 그리며 아래로 떨어지기 때문에 체류시간이 길어지는 효과가 있으나, 재 순환 영역이 상부로 이동함에 따라 건조되지 못한 액적이 벽에 부딪힐 위험성이 증가하였다. Using CFX4, a computational fluid dynamics program, the gas flow pattern, the droplet trajectory and the extent of drying were calculated for spray drying of a milk with a rotary disk in a spray chamber of 140㎝ in diameter and 170㎝ in height. Due to the cone of the chamber, whose cross sectional area became smaller toward the outlet, a recirculation flow was formed in the chamber pointing downward in the center and upward near the wall. The gas flow pattern was significantly affected by the droplets ejected from the rotating disk. The smaller droplets descended downward not far from the axis, medium sized droplets were swept into the recirculation flow, and even larger ones were little affected by the recirculation flow, travelling downward near the wall. The center of recirculation flow moved upward and toward the wall as the vane angle of the air disperser was increased from 0 to 30 and 45˚. An increase of the vane angle increased the swirling intensity and consequently the droplets flew in a larger circle resulting in an increase of the residence time. On the other hand, the droplets became more likely to hit the wall with the vane angle increase.
Kwon, Taek-Ka,Yang, Jae-Ho,Kim, Sung-Hun,Han, Jung-Suk,Lee, Jai-Bong The Korean Academy of Prosthodonitics 2007 대한치과보철학회지 Vol.45 No.6
Statement of problem. The performance and maintenance of implant-supported prostheses are primarily dependent upon load transmission both at the bone-to-implant interface and within the implant-abutment-prosthesis complex. The design of the interface between components has been shown to have a profound influence on the stability of screw joints. Purpose. The Purpose of this study was to compare the strength and the fatigue resistance of 1-piece and 2-piece abutment connected to oral implant, utilizing an internal conical interface. Material and methods. Twenty $Implatium^{(R)}$ tapered implants were embedded to the top of the fixture in acrylic resin blocks. Ten $Combi^{(R)}$(1-piece) and $Dual^{(R)}$(2-piece) abutments of the same dimension were assembled to the implant, respectively. The assembled units were mounted in a testing machine. A load was applied perpendicular to the long axis of the assemblies and the loading points was at the distance of 7mm from the block surface. Half of 1-piece and 2-piece abutment-implant units were tested for the evaluation of the bending strength, and the others were cyclically loaded for the evaluation of the fatigue resistance until plastic deformation occurred. Nonparametric statistical analysis was performed for the results. Results. Mean plastic and maximum bending moment were $1,900{\pm}18Nmm,\;3,609{\pm}106Nmm$ for the 1-piece abutment, and $1,250{\pm}31Nmm,\;2,688{\pm}166Nmm$ for the 2-piece abutment, respectively. Mean cycles and standard deviation when implant-abutment joint showed a first plastic deformation were $238,610{\pm}44,891$. cycles for the 1-piece abutment and $9,476{\pm}3,541$ cycles for the 2-piece abutment. A 1-piece abutment showed significantly higher value than a 2-piece abutment in the first plastic bending moment (p<.05), maximum bending moment (p<.05) and fatigue strength (p<.05). Conclusion. Both 1-piece and 2-piece conical abutment had high strength and fatigue resistance and this suggests long-term durability without mechanical complication. However, the 1-piece conical abutment was more stable than the 2-piece conical abutment in the strength and the fatigue resistance.
Comparative fracture strength analysis of Lava and Digident CAD/CAM zirconia ceramic crowns
Kwon, Taek-Ka,Pak, Hyun-Soon,Yang, Jae-Ho,Han, Jung-Suk,Lee, Jai-Bong,Kim, Sung-Hun,Yeo, In-Sung The Korean Academy of Prosthodonitics 2013 The Journal of Advanced Prosthodontics Vol.5 No.2
PURPOSE. All-ceramic crowns are subject to fracture during function. To minimize this common clinical complication, zirconium oxide has been used as the framework for all-ceramic crowns. The aim of this study was to compare the fracture strengths of two computer-aided design/computer-aided manufacturing (CAD/CAM) zirconia crown systems: Lava and Digident. MATERIALS AND METHODS. Twenty Lava CAD/CAM zirconia crowns and twenty Digident CAD/CAM zirconia crowns were fabricated. A metal die was also duplicated from the original prepared tooth for fracture testing. A universal testing machine was used to determine the fracture strength of the crowns. RESULTS. The mean fracture strengths were as follows: $54.9{\pm}15.6$ N for the Lava CAD/CAM zirconia crowns and $87.0{\pm}16.0$ N for the Digident CAD/CAM zirconia crowns. The difference between the mean fracture strengths of the Lava and Digident crowns was statistically significant (P<.001). Lava CAD/CAM zirconia crowns showed a complete fracture of both the veneering porcelain and the core whereas the Digident CAD/CAM zirconia crowns showed fracture only of the veneering porcelain. CONCLUSION. The fracture strengths of CAD/CAM zirconia crowns differ depending on the compatibility of the core material and the veneering porcelain.
초임계처리방법에 따른 오미자 추출물 및 추출박에 대한 유효성분 및 항산화활성 비교
Ka Soon Lee,Kwan Mo You,Yeong Chun Park,Bong Jae Seong,Sun Ick Kim,Moo Geun Jee,Seung Ho Han,Su Dong Kim,Eui Seok Lee,Soon Taek Hong,Hyun Ho Kim 한국약용작물학회 2016 한국약용작물학술대회 발표집 Vol.2016 No.10
Background : The effective components of Omija(Schisandra chinensis Bailllon) are lignans (schizandrins and gomisins), and this components were contented mostly in seed part on Omija, which have various physiological functionalities such as anti-cancer, anti-inflammatory, and antioxidant activities. Methods and Results : This study was carried out to determine effective condition(CO2, CO2+ethanol) on extraction using supercritical carbon dioxide extraction (SFE) system and to find interrelation on effective components and antioxidant activity of extracts and residues obtained after extraction. Effective components were analysed lignans and phenolic compounds and antioxidant activirty was determined for DPPH radical scavenging ability on methanol extracts of SFE-extract and SFE-residue. On SFE with ethanol, SFE extract was separated two phase, upper(water phase) and lower(oil phase). SFE-extract showed the highest total lignans content(61.36 mg/g, 72.14 mg/g on lower, 50.58 mg/g on upper) and the lowest total phenolic compounds(6.52 mg/100g) and SFE-residue showed the lowest total lignans content(1.45 mg/g) and the highest total phenolic compounds(16.23 mg/100g) by extracted on CO2+ethanol treatment. SFE-residue methanol extract showed the highest DPPH radical scavenging abilities and SFE-extract upper showed the lowest. Conclusion : Thus, this results showed SFE-extract showed the highest total lignans content, but SFE-residue showed the highest DPPH radical scavenging ability although the lowest total lignans content.
Ka Soon Lee,Bong Jae Seong,Sun Ick Kim,Moo Geun Jee,Hyun Ho Kim,Kwan Mo You,Soon Taek Hong 한국약용작물학회 2017 한국약용작물학술대회 발표집 Vol.2017 No.05
Background : Korea ginseng root has been traditionally used as a tonic as it is stated to have the capacity to normalize body functions and strengthen systems that are caused by various stresses. So, ginseng is functional food with the functionalities certified by Korea Food and Drug Administration. But, there are not many different products using ginseng. This study was conducted to develop the new ginseng beverage product using emulsify process. Methods and Results : White ginseng and red ginseng, 4-years old, prepared were ground to 60 ± 5 mesh using a grinder (Cyclotec 1093, POSS Co., Swiss). Emulsion with white ginseng powder (WGP) and lipid phase (canola oil) were prepared using the modified method (Yun & Hong, 2007). Oil-in water emulsions were made by homogenizing (5,000 – 15,000 rpm, 20 – 60 min), and then were analysed ginsenosides content, protein and polysaccharide content. The higher the speed of homogenizer and the longer the time, the higher the ginsenosides extraction rate. On emulsifying for 60 min at 12,000 rpm, ginsenosides were extracted by more than 95%. Red ginseng powder (RGP) was superior to WGP in emulsified activity, but WGP was superior to RGP in emulsion stabilizing. Comparing components of WGP and RGP emulsion, RGP had more ginsenosides content than WGP, and less polysaccharides content. When mixing WGP and RGP with a ratio of 90 : 10 – 70 : 30, the emulsion have excellent emulsifying and stabilizing. Conclusion : Thus, WGP and RGP are the same ginseng, but they have different physiological characteristics because their manufacturing process is different. These studies may provide new product development for effective utilization of ginseng by using excellent emulsion stabilizing of WGP and emulsifying of RGP.
엣지 디바이스를 이용한 실시간 영상 데이터 습득 및 욜로 시스템기반 물체 인식에 관한 연구
김가희(Ka-Hee Kim),이영재(Young-Jae Lee),임길택(Kil-Taek Lim) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
본 논문은 엣지 디바이스를 이용하여 여러 종류의 카메라에서 다양한 사물을 인식 할 수 있는 시스템을 구현한다. 다양한 환경에서 수집되는 데이터를 이용해 사물 인식을 수행해, 실제 환경에 적용 할 수 있도록 하였다. 본 연구에서는 실시간 사물인식에 적합한 YOLOv4를 이용하여, 카메라로부터 근거리 영상을 받아 사물 인식을 수행하였다.