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안정화 원소 Ti 첨가에 따른 스테인리스강의 해수 내 캐비테이션-침식 특성
최용원(Yong-Won Choi),양예진(Ye-Jin Yang),김성종(Seong-Jong Kim) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.4
Stainless steel is widely applied in many industrial fields due to its excellent anti-corrosion and durability characteristics. However, stainless steel is very vulnerable to cavitation attack caused by high speed flow of fluid in the chloride environments such as marine environment. These conditions promote intergranular corrosion and cavitation-erosion, leading to degradation of the structural integrity and service life. In order to prevent these problems, the stabilized stainless steel is applied to the offshore and shipbuilding industries. In this study, Ti was added to 19%Cr-9%Ni as the stabilizer element with different concentrations (0.26%, 0.71%), and their durabilities were evaluated with cavitation-erosion experiment by a modified ASTM G32 method. The microstructural change was observed with the stabilizer element contents. The result of the observation indicated that the amount of carbide precipitation was decreased and its size became finer with increasing Ti content. In the cavitation-erosion experiment, both weight loss and surface damage depth represented an inverse proportional relationship with the amount of Ti element. Consequently, the stainless steel containing 0.71% of Ti had excellent durability characteristics.
스트릿 댄스 지도자 리더십에 따른 전공학생의 흥미와 몰입 간의 관계
최용원(Choi, Yong-Won),황성우(Hwang, Sung-Woo) 한국사회체육학회 2017 한국사회체육학회지 Vol.0 No.68
This research intends to provide the basic data for the street dance major students’ efficient and positive use of their practice time that is on increase. For this purpose, we examined the street dance major students’ leadership and interest and also studied their influence on the street dance major students’ being immersed in dancing. The subject of this study were street dance major students. Convenience sampling, which is a nonprobability sampling, was used. Among a total of 400 questionnaires distributed, 380 copies were collected back. And the questionnaires that were insincerely replied, double-replied or judged useless for the study were excluded and a total of 360 questionnaires were analyzed. The research results are as follows: First, the results of examining the influence of the leadership on the interest were partly influenced. Second, the results of examining the influence of the leadership on being immersed in dancing were partly influenced. Third, the results of examining the influence of the interest on being immersed in dancing were partly influenced.
해수 내 캐비테이션-침식 저항성에 미치는 스테인리스강의 Nb 첨가의 영향
최용원(Yong-Won Choi),한민수(Min-Su Han),김성종(Seong-Jong Kim) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.3
Stainless steel is widely used in various industries due to its excellent anti-corrosion characteristics. However, if the stainless steel is exposed to high speed fluid flow and chloride ion in the marine environment, corrosion and cavitation damage occurred on the surface easily. Therefore, to prevent these problems, stabilzed stainless steel is applied to offshore and shipbuilding industries. In this study, stabilized stainless steel specimen was made by 19%Cr-9%Ni with different Nb contents (0.29%, 0.46% and 0.71%). And then, their cavitation characteristics were investigated. As a result, the characteristics of cavitation resistance of stainless steel could be improved by increasing Nb contents.
클라우드 환경의 마이크로서비스와 모놀리식 아키텍처의 성능 비교 및 분석
최용원(Yong-Won Choi),이연빈(Yeon-Bin Lee),이원주(Won-Ju Lee),주시은(Si-Eun Joo),이도경(Do-Kyung Lee),이지현(Ji-Hyun Lee),박세진(Se-Jin Park) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
This paper presents a comparative analysis of monolithic architecture and microservice architecture in cloud environment. The introduction provides a background on the growing popularity of microservices. The main body of the paper introduces the concepts of monolithic and microservice architectures, and discusses the internal communication speed limits of microservices. In addition, two approaches for overcoming these limits, namely the internal load balancer and Service Mesh, are also presented. The performance comparison and analysis section compares the communication speed between clients in both monolithic and microservice architectures. Furthermore, the paper presents a resilience test in which a single service is terminated and the system’s ability to recover is evaluated. Lastly, the communication speed between the internal load balancer and Service Mesh approaches for microservice communication is compared. Overall, this paper provides insights into the benefits and limitations of both monolithic and microservice architectures in a cloud environment. The findings can help software architects and developers in selecting the appropriate architeture for their cloud-based applications.
장기간 지팡이의 사용이 뇌졸중 환자의 건측 상지 기능에 미치는 영향
손성민,최용원,김중선,Son, Sung-Min,Choi, Yong-Won,Kim, Chung-Sun 대한물리치료학회 2012 대한물리치료학회지 Vol.24 No.2
Purpose: The purpose of this study was to investigate the adverse effects of sensorimotor function at the shoulder joint according to long-term cane usage in stroke patients without apraxic behavior, in terms of the presence of shoulder joint pain, accuracy of tracking task, proprioceptive joint position sense, and nine-hole pegboard. Methods: Nineteen stroke patients with long-term cane usage (cane usage group) and nineteen stroke patients without cane usage (non-cane usage group) were recruited. All subjects were tested in pain presence, a tracking task for visuomotor function, joint reposition, and nine-hole pegboard in the shoulder joint regarding the non-affected side. Results: In the accuracy index for tracking task and the nine-hole pegboard test, significant differences were observed between the cane usage group and the non-cane usage group. However, although a higher emergence of shoulder pain and a lower accuracy for joint reposition sense were detected in the cane usage group in comparison to the non-cane usage group, there were no significant differences between the two groups. Conclusion: Our findings suggest that long-term cane usage could induce to decrease in delicate movement and coordination in the non-affected upper arm in stroke patients. In addition, they could experience high frequency of shoulder pain and poor joint reposition sense. Therefore, careful evaluation and observation will be required concerning stroke patients with long-term cane usage.
새만금 연근해의 해상풍력 타당성 조사를 위한 원격감시 풍력계측
최연성(Choi, Yeon-Sung),최용원(Choi, Yong-Won),전칠환(Jeon, Chil-Hwan) 한국정보전자통신기술학회 2009 한국정보전자통신기술학회논문지 Vol.2 No.3
화석연료 사용으로 인한 환경오염 및 에너지원가 상승이 큰 문제로 대두되고 있는 현재의 상황을 타개하기 위한 하나의 방안으로 신재생에너지에 대한 관심이 고조되고 있다. 특히 서해안에 위치하고 있는 새만금 지역은 광활한 면적과 서북서풍이라는 큰 장점을 가지고 있어 풍력발전의 적지로 예상되고 있다. 본 연구는 이러한 예상을 뒷받침해줄 수 있는 풍력자원을 조사한 것으로 군산 해상지역의 평균풍속은5~7m/s 정도이며, 도서지방을 연계하는 해상풍력발전 단지의 최적지로 손색이 없음을 밝혔다. 또한, 풍력자원의 출현밀도를 판별하는 Weibull의 분포한수를 이용하여 계산하고, 형상계수를 매개변수로 하여 풍속밀도계산을 한 결과, 군산지방의 풍속출현을 예상할 수 있었다. 또한 이를 원격감시를 통해 계측 제어함으로써 편리함과 동시에 안정성 면에서도 큰 성과를 이룰 수 있다. Environmental pollution caused by fossil fuel use and energy sources, the big concern is the rise of the current situation, one of the ways to overcome the interest in renewable energy is Gozo. Located on the west coast, especially the Saemangeum area and the northwest wind, the big advantage of the vast area that's got quite a number of wind turbines is expected. This study affirms that these expectations can be a wind energy resource survey sea area of the average wind speed of Kunsan 5 ~ 7m / s is enough, books are linked to the local marine wind farms can safely say that none of choejeokji said. In addition, the emergence of the wind resource to determine the density of the Weibull distribution is calculated using the number 1, the shape factor as a parameter to calculate the density of the wind a result, Gunsan Province was able to predict the emergence of the wind. In addition, by controlling the remote monitoring through the measurement exceeded the convenience and reliability at the same time you can achieve great results.
The Effect of Different Head Positions in Sitting on Head/Shoulder Posture and Muscle Activity
권중원,남석현,최용원,김중선,Kwon, Jung-Won,Nam, Seok-Hyun,Choi, Yong-Won,Kim, Chung-Sun The Korean Society of Physical Therapy 2013 대한물리치료학회지 Vol.25 No.4
Purpose: This study was to investigate whether the two different head postures, natural and ideal head posture, affect head/shoulder posture and muscle activity. Methods: Thirty healthy subjects with the forward head and round shoulder posture were participated in this study. This study utilized a within-subjects design with subjects being positioned into two sitting positions: natural head posture (NHP) and ideal head posture (IHP). Forward head angle (FHA) and forward shoulder angle (FSA) of each subject were measured for assessing the head/shoulder posture and muscle activities of upper trapezius (UT), lower trapezius (LT), and serratus anterior (SA) during the forward overhead reaching. Results: There were significant increases in both FHA and FSA after taking IHP, which showed greater angles than in taking NHP. In change of muscle activities, there were significant decreases in both LT and SA after taking IHP, which showed lower activities than in taking a NHP, whereas there was no significant change in UT. Conclusion: These findings demonstrate that postural alterations associated with forward head and rounded shoulder postures could alter scapular kinetics and muscle activity during the forward overhead reaching.