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Woo-Ram Kang,Se Hwan Park,이덕주 한국항공우주학회 2018 International Journal of Aeronautical and Space Sc Vol.19 No.4
The article “Simulation of Counter-Rotating Vortex Pairs on a Triangular-Flapped Wing with Flap-Tip Free Vortex Modeling”, written by Woo-Ram Kang, Se Hwan Park and Duck-Joo Lee, was originally published electronically on the publisher’s internet portal (currently SpringerLink) on 08 September 2018 with open access. With the author(s)’ decision to step back from Open Choice, the copyright of the article changed on 24 October 2018 to © The Korean Society for Aeronautical & Space Sciences and Springer Nature Singapore Pte Ltd. 2018 and the article is forthwith distributed under the terms of copyright. The original article has been corrected.
Comparative study of oncologic outcomes for laparoscopic vs. open surgery in transverse colon cancer
Woo Ram Kim,Se Jin Baek,Chang Woo Kim,Hyun A Jang,Min Soo Cho,Sung Uk Bae,Hyuk Hur,Byung Soh Min,Seung Hyuk Baik,Kang Young Lee,Nam Kyu Kim,Seung Kuk Sohn 대한외과학회 2014 Annals of Surgical Treatment and Research(ASRT) Vol.86 No.1
Purpose: Laparoscopic resection for transverse colon cancer is a technically challenging procedure that has been excluded from various large randomized controlled trials of which the long-term outcomes still need to be verified. The purpose of this study was to evaluate long-term oncologic outcomes for transverse colon cancer patients undergoing laparoscopic colectomy (LAC) or open colectomy (OC). Methods: This retrospective review included patients with transverse colon cancer who received a colectomy between January 2006 and December 2010. Short-term and five-year oncologic outcomes were compared between these groups. Results: A total of 131 patients were analyzed in the final study (LAC, 84 patients; OC, 47 patients). There were no significant differences in age, gender, body mass index, tumor location, operative procedure, or blood loss between groups, but the mean operative time in LAC was significantly longer (LAC, 246.8 minutes vs. OC, 213.8 minutes; P = 0.03). Hospital stay was much shorter for LAC than OC (9.1 days vs. 14.5 days, P < 0.01). Postoperative complication rates were not statistically different between the two groups. In terms of long-term oncologic data, the 5-year disease-free survival and overall survival were not statistically different between both groups, and subgroup analysis according to cancer stage also revealed no differences. Conclusion: LAC for transverse colon cancer is feasible and safe with comparable short- and long-term outcomes.
Morphing Wing Mechanism Using an SMA Wire Actuator
Kang, Woo-Ram,Kim, Eun-Ho,Jeong, Min-Soo,Lee, In,Ahn, Seok-Min The Korean Society for Aeronautical and Space Scie 2012 International Journal of Aeronautical and Space Sc Vol.13 No.1
In general, a conventional flap on an aircraft wing can reduce the aerodynamic efficiency due to geometric discontinuity. On the other hand, the aerodynamic performance can be improved by using a shape-morphing wing instead of a separate flap. In this research, a new flap morphing mechanism that can change the wing shape smoothly was devised to prevent aerodynamic losses. Moreover, a prototype wing was fabricated to demonstrate the morphing mechanism. A shape memory alloy (SMA) wire actuator was used for the morphing wing. The specific current range was measured to control the SMA actuator. The deflection angles at the trailing edge were also measured while various currents were applied to the SMA actuator. The trailing edge of the wing changed smoothly when the current was applied. Moreover, the deflection angle also increased as the current increased. The maximum frequency level was around 0.1 Hz. The aerodynamic performance of the deformed airfoil by the SMA wire was analyzed by using the commercial program GAMBIT and FLUENT. The results were compared with the results of an undeformed wing. It was demonstrated that the morphing mechanism changes the wing shape smoothly without the extension of the wing skin.
Effect of operating parameters on methanation reaction for the production of synthetic natural gas
Woo Ram Kang,이기봉 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.7
Concerns about the depletion and increasing price of natural gas are generating interest in the technology of synthetic natural gas (SNG) production. SNG can be produced by the methanation reaction of synthesis gas obtained from coal gasification; this methanation reaction is the crucial procedure for economical production of SNG. We investigated the effect of operating parameters such as the reaction temperature, pressure, and feed compositions (H2/CO and CO2/CO ratios) on the performance of the methanation reaction by equilibrium model calculations and dynamic numerical model simulations. The performance of the methanation reaction was estimated from the CO conversion,CO to CH4 conversion, and CH4 mole fraction in the product gas. In general, a lower temperature and/or higher pressure are favorable for the enhancement of the methanation reaction performance. However, the performance becomes poor at low temperatures below 300 oC and high pressures above 15 atm because of limitations in the reaction kinetics. The smaller the amount of CO2 in the feed, the better the performance, and an additional H2 supply is essential to increase the methanation reaction performance fully.
Morphing Wing Mechanism Using an SMA Wire Actuator
Woo-Ram Kang,Eun-Ho Kim,Min-Soo Jeong,In Lee,Seok-Min Ahn 한국항공우주학회 2012 International Journal of Aeronautical and Space Sc Vol.13 No.1
In general, a conventional flap on an aircraft wing can reduce the aerodynamic efficiency due to geometric discontinuity. On the other hand, the aerodynamic performance can be improved by using a shape-morphing wing instead of a separate flap. In this research, a new flap morphing mechanism that can change the wing shape smoothly was devised to prevent aerodynamic losses. Moreover, a prototype wing was fabricated to demonstrate the morphing mechanism. A shape memory alloy (SMA) wire actuator was used for the morphing wing. The specific current range was measured to control the SMA actuator. The deflection angles at the trailing edge were also measured while various currents were applied to the SMA actuator. The trailing edge of the wing changed smoothly when the current was applied. Moreover, the deflection angle also increased as the current increased. The maximum frequency level was around 0.1 Hz. The aerodynamic performance of the deformed airfoil by the SMA wire was analyzed by using the commercial program GAMBIT and FLUENT. The results were compared with the results of an undeformed wing. It was demonstrated that the morphing mechanism changes the wing shape smoothly without the extension of the wing skin.
Woo-Ram Kang,Se Hwan Park,이덕주 한국항공우주학회 2018 International Journal of Aeronautical and Space Sc Vol.19 No.4
A triangular-flapped wing planform, which produced two counter-rotating vortex pairs, was simulated using the horseshoe vortex method (HVM). A modeling method using discrete horseshoe vortex elements was introduced to model the geometrical discontinuities of the flap-tip juncture. The flap-tip modeling method allows the four-vortex system generated behind the triangular-flapped wing configuration to be simulated accurately. When the model was not applied, a strong vortex was generated at the wing-flap corner. The wake behavior and rolling moment induced by the wake vortices were investigated and compared with a reference experiment. The results of the simulation indicate that the quantitative values of the rolling-moment parameter can be estimated as well as the wake behaviors, even great distances. Even though only macroscopic wake behaviors can be simulated, due to limitations regarding viscosity and diffusion effects, these results support the theory that the HVM can simulate the initial stage of the instability of wake vortices in the inviscid region.
Kang, Bo Ram,Yu, Woo Jong,Kim, Ki Kang,Park, Hyeon Ki,Kim, Soo Min,Park, Yongjin,Kim, Gunn,Shin, Hyeon-Jin,Kim, Un Jeong,Lee, Eun-Hong,Choi, Jae-Young,Lee, Young Hee WILEY-VCH Verlag 2009 Advanced functional materials Vol.19 No.16
<P>Here, a pyrolytically controlled antioxidizing photosynthesis coenzyme, β-Nicotinamide adenine dinucleotide, reduced dipotassium salt (NADH) for a stable n-type dopant for carbon nanotube (CNT) transistors is proposed. A strong electron transfer from NADH, mainly nicotinamide, to CNTs takes place during pyrolysis so that not only the type conversion from p-type to n-type is realized with 100% of reproducibility but also the on/off ratio of the transistor is significantly improved by increasing on-current and/or decreasing off-current. The device was stable up to a few months with negligible current changes under ambient conditions. The n-type characteristics were completely recovered to an initial doping level after reheat treatment of the device.</P> <B>Graphic Abstract</B> <P>Pyrolytically controlled antioxidizing photosynthesis coenzyme is used to generate stable n-type doping of carbon nanotubes under ambient conditions. The device is stable up to a few months with negligible current changes under ambient conditions. The n-type characteristics were completely recovered to an initial doping level after reheat treatment of the device. <img src='wiley_img/1616301X-2009-19-16-ADFM200801712-content.gif' alt='wiley_img/1616301X-2009-19-16-ADFM200801712-content'> </P>
신입생 기숙사 생활 속에서의 자기통제력과 건강증진 생활양식의 관계
강우람(Kang, Woo-Ram),한광령(Han, Kwang-Leong),김기섭(Kim, Ki-Sup) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.3
The foundational purpose of this research is to find out the health affects of people while managing self control in university dormitory. The research is based on the survey answered from 400 students who are from university located in Young in province in korea, and 378 answers were analyzed by SPSS 18.0 Version statistic program taking frequency, factor and reliability analysis as well as correlation and multiple regression analysis. The conclusion we have from this research is that first, health, stress and self esteem has been influenced by self control managing to improve the health.