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전창수,Jeon, Chang-Soo 한국전산유체공학회 1998 한국전산유체공학회지 Vol.3 No.2
Numerical simulations on the flowfield of lifting chamber for Wing-In-Ground vehicle were performed using Fluent/UNS 4.2 software. The trend of lifting force in lifting chamber and parametric study of geometric and fluid variables were primarily investigated. Selected parameters for investigation are inlet velocity, height between chamber and water level, depth of the skirt, location of inlet, variaton of height at bow and stern. Also, air capturing capabilities from downstream of the propeller were evaluated at the air inlet. The lifting force was increased linearly with the increased of inlet velocity and nonlinearly with the decrease of height force was increased with increased depth. It turned out to have very minor effect on lifting force to change the location of air inlet for lifting chamber, installed on top surface. Tilting the vehicle when it was lifted, the lifting forces, generated in each case, showed no appreciable changes.
전창수(Chang Soo Jeon) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.3 No.2
Numerical simulations on the flowfield of lifting chamber for Wing- In-Ground vehicle were performed using Fluent/UNS 4.2 software. The trend of lifting force in lifting chamber and parametric study of geometric and fluid variables were primarily investigated. Selected parameters for investigation are inlet velocity, height between chamber and water level, depth of the skirt, location of inlet, variation of height at bow and stern. Also, air capturing capabilities from downstream of the propeller were evaluated at the air inlet. The lifting force was increased linearly with the increase of inlet velocity and nonlinearly with the decrease of height between the chamber and water level. As for the variation in depth of the skirt, the lifting force was increased with increased depth. It turned out to have very minor effect on lifting force to change the location of air inlet for lifting chamber, installed on top surface. Tilting the vehicle when it was lifted, the lifting forces, generated in each case, showed no appreciable changes.
전창수(Chang Soo Jeon) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.3 No.2
Numerical simulations on the flowfield of lifting chamber for Wing- In-Ground vehicle were performed using Fluent/UNS 4.2 software. The trend of lifting force in lifting chamber and parametric study of geometric and fluid variables were primarily investigated. Selected parameters for investigation are inlet velocity, height between chamber and water level, depth of the skirt, location of inlet, variation of height at bow and stern. Also, air capturing capabilities from downstream of the propeller were evaluated at the air inlet. The lifting force was increased linearly with the increase of inlet velocity and nonlinearly with the decrease of height between the chamber and water level. As for the variation in depth of the skirt, the lifting force was increased with increased depth. It turned out to have very minor effect on lifting force to change the location of air inlet for lifting chamber, installed on top surface. Tilting the vehicle when it was lifted, the lifting forces, generated in each case, showed no appreciable changes.
전창수(Chang Soo Chon),김한성(Han Sung Kim),심준성(June Sung Shim),김영호(Young Ho Kim) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.10
In this study, two dimensional and three dimensional finite element models of lower first premolar were analyzed. The mandibular specimen including a premolar was obtained from a cadaver and scanned with micro-CT. Finite element method models were reconstructed from CT images at mid-sagittal plane of the tooth. Most studies have used a wide range of value(0.07-1000㎫) for elastic modulus of periodontal ligament. The elastic modulus of the periodontal ligament was analyzed by finite element method and compared with that of experiment model. This study indicated that the model without pulp was more suitable than that with pulp in two dimensional finite element analysis.
한국인 Cadaver Test에 의한 상완골 골수정 개발에 관한 연구
전창수(Chang Soo Chon),이재원(Jae Won Lee),고철웅(Cheol Woong Ko),오종건(Jong Keon Oh),우수헌(Soo Heon Woo),이성재(Sung Jae Lee) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.8
The aim of this study is to develop a humeral Intramedullary fixation nail (HIFN) suitable for Korean people. In this study, CT images were obtained from 72 Korean cadaveric humeral bones and 3D Korean humeral bone models were reconstructed based on the CT images to investigate anatomical characteristics. Major design parameters of HIFN were selected using the morphological measurement information of the Korean humeral bone models. Through finite element analysis and mechanical tests, the developed HIFN prototype was compared with the Polarus HIFN (ACUMED<SUP>ⓡ</SUP>, USA), and it was found that the HIFN prototype showed similar and/or superior mechanical performance compared to the Polarus HIFN. Also, clinical validation for the HIFN prototype was carried out to check predictable troubles in surgical operations. Finally, optimal design modification was proposed to prevent the possible axillary nerve injury due to the locking screw system of the HIFN prototype.
망상골의 구조와 밀도가 치과용 임플란트와 하악골에 미치는 영향
전창수(Chang Soo Chon),김한성(Han Sung Kim),이상업(Sang Up Lee),이경중(Kyoung Joung Lee) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.10
This study examined the effect of cancellous bone microstructure on stress distribution within a premolar tooth and a dental implant against mastication force by the micro-finite element method (FEM). The mandibular specimen including a premolar was obtained from a cadaver and scanned with micro-CT to obtain CT images. FE models were reconstructed from CT images at mid-sagittal plane of the tooth. Six models were generated and analyzed for different structure and density in cancellous bone. Stress distributions for each implant (or tooth) and the surrounding bone were compared. The study indicated that the microstructure of cancellous bone should be considered in finite element analysis to produce reasonable results and thus implant systems with high success rate.
목학수(Hak Soo Mok),전창수(Chang Su Jeon),한창효(Chang Hyo Han),Steven J. Skerlos,김형주(Hyung Ju Kim),이규창(Kyu Chang Lee) Korean Society for Precision Engineering 2010 한국정밀공학회지 Vol.27 No.3
Remanufacturing is a process that restores old products to perform like new, while saving energy, reducing consumption of natural resources, and lowering environmental emissions. By extending the product life cycle, remanufacturing approaches enable closed loop material cycles that are ultimately necessary for a sustainable society. This paper provides some description of the current automotive remanufacturing enterprise, with a particular emphasis on key vehicle components that are currently remanufactured. The analysis yields two major conclusions. First, volume of the USA automotive after sales and remanufacturing industry market is estimated. Second, market price of a remanufactured component in the automotive sector is surprisingly uncorrelated with the number of companies engaged in remanufacturing that component ? at least for companies registered with the Automotive Parts Remanufacturing Association (ARPA).
색상 검출방식의 천이 액정법에서 색상 변화 시간 산정의 정확도 향상
신소민(Somin Shin),전창수(Chang Soo Jeon),곽재수(Jae Su Kwak),정용운(Yong Wun Jung) 대한기계학회 2007 大韓機械學會論文集B Vol.31 No.11
In this paper, different criteria for determining hue change time in the hue detection based transient liquid crystals technique were compared. Results showed that methods utilizing threshold of intensity or saturation gave many missing points and quality of the calculated results were strongly depends on the value of threshold. Wider bandwidth in the hue bandwidth method showed better distribution of calculated hue change time, but induced ambiguity in the hue change time. In the time-hue curve fitting method, the distribution of evaluated hue change time was smooth and reasonable, and, by the nature of curve fitting, the noise effect on the hue was successfully considered in calculating of the hue change time. Compared to other methods, it is expected that the time-hue curve fitting method would provide better and accurate hue change time in the hue detection based transient liquid crystals technique.
목학수,한창효,전창수,이정훈,이규창,성인철,송재용,Mok, Hak-Soo,Han, Chang-Hyo,Jeon, Chang-Su,Lee, Jung-Hun,Lee, Kyu-Chang,Sung, In-Cheol,Song, Jae-Yong 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.3
In this paper, we analyze the standards of the bolts for maintaining the products. The maintainer don't know the detail information of bolts by seeing the shape of bolts when they repair the products. So they waste much time and cost. To solve the these problem, we propose the new systematical discrimination of bolts. To propose the discrimination code, we divide the shapes of the bolts into four classes(head, internal drive, shank and end). User can fine preferentially similar standards by just the shapes of bolts under the this discrimination code. And, User can find the standards of bolts that they want by using the additional information such as measurements. We will reduce the cost and time for the maintaining the products by using the proposed discrimination code.