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Fe-3%C-16%(Ni+Mn+Cu) 주철에서 상변태에 미치는 Cu 조성비의 영향
박기덕 ( Gi Deok Park ),허회준 ( Hoe Jun Heo ),나혜성 ( He Sung Na ),강정윤 ( Chung Yun Kang ) 대한금속재료학회 ( 구 대한금속학회 ) 2012 대한금속·재료학회지 Vol.50 No.6
The purpose of this research was to develop a low Ni austenitic cast iron through replacing Ni by Cu and Mn because they are cheaper than Ni. The effect of the Cu content (6-12 wt%) on the microstructure characteristics was investigated in Fe-3%C-16%(Ni+Cu+Mn) cast iron. Contrary to general effect of the Cu on cast iron, the result of the microstructure analysis indicated that bainite and cementite were formed in high Cu content (>8 wt%Cu). A crystallized Cu-solution (Cu-Mn) phase and MnS in the Cu-solution were formed. The quantity of those phases increased as the Cu content increased. Consequently, the high Cu content in the composition ratio (Ni+Cu+Mn=16%) caused the formation of Cu-Mn/MnS and those phases decreased the effect of Cu and Mn on austenite formation. For this reason, bainite and cementite were formed in high Cu content.
박기덕 ( Gi-deok Park ),황상윤 ( Sang-yun Hwang ),노영주 ( Young J Rho ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.2
스마트폰이 많이 보급되어 커다란 시장을 형성하고 있고, 많은 기업체에서 전자 결제 시스템을 도입하는 등, 스마트폰으로 업무를 보는 환경이 늘어나고 있다. 더불어 스마트폰 보안 및 분실, 도난 방지 시스템의 필요성을 느끼게 되었다. 본 논문에서 다루는 내용은 안드로이드SDK기반 스마트폰의 분실이나 도난을 방지하고 내부의 중요한 데이터를 보존하기 위한 시스템으로, 분실 시 정보의 유출을 제한 하기위한 방법에 중심을 두고 개발하였다.
Medx-Training이 산후 요통 환자의 요부안정화와 하지길이에 미치는 영향
박기덕(Park Gi-Duck),윤성덕(Yoon Seong-Deok) 한국체육과학회 2007 한국체육과학회지 Vol.16 No.3
We gave a 6 weeks exercise program which used "Medx" to patients who had chronic lumbago after first childbirth and then checked the effect on stabilization of lower back and length of lower extremity, and the difference between exercise group with non-exercise group. finally we got following conclusion. 1) concerning with change of muscular strength of extension of lower back, exercise program group with "Medx" have a significant(p<.05) effect of increase in the degree of angle. 2) concerning with change of length of lower extremity, exercise program group with "Medx" have a significant (p<.05) effect of decrease of length of lower extremity. we concluded that 6 weeks exercise program which used "Medx" had an good effect on stabilization of lower back and pelvis by strengthening muscle of extension of lower back and decreasing change of length of lower extremity and so it will be expected to be good program for the people with postpartum pain.
윤성덕(Yoon, Seong-Deok),박기덕(Park, Gi-Duck) 한국체육과학회 2020 한국체육과학회지 Vol.29 No.6
This literature review seeks to examine and verify the interactions and effects of Core muscles and Low Back Pain. Core or trunk are waist, pelvis, and abdomen muscles, which provide stable spine stabilization and body movement. These Core exercises are designed to show more muscle activity when performed in an unstable state, and there are various methods of exercise for Swiss ball movements, slings, and pier movements. In addition, Low Back Pain is experienced at least once in about 80% or more of the adult population. Low Back Pain There are many causes, but weakening of the lumbar trunk muscle strengthening reduces the stability of Core muscles, causing illness and pain. The interaction between these Low Back Pain and Core exercise depends on the exercise method of the previous study, but after participating in Core exercise, it is effective in improving the physical function and pain of back pain Low Back Pain. There are many causes of Low Back Pain, but Core exercise may be offered to prevent this. As a result, it is necessary to apply a lot of rehabilitation in the field of sports to systematically manage the competitiveness of athletes and the health of the general public, and to develop new training methods through verification of sustainable effects.
8주간의 척추안정화 운동이 볼링선수의 FMS와 하지 근기능에 미치는 영향
윤성덕(Yoon, Seong-Deok),박기덕(Park, Gi-Duck) 한국체육과학회 2018 한국체육과학회지 Vol.27 No.2
The purpose of this study is to examine the effect of 8-week spinal stabilization exercise on functional movement screen(FMS) and lower extremity function of bowlers. After performing spinal stabilization exercise twice per week for 12 weeks, bowlers showed the following results. A 12-week spinal stabilization exercise program influenced changes in FMS, indicating significant differences in deep squat (p<.01), huddle step (p<.05), and inline lunge (p<.05). However, it showed non-significant differences in shoulder mobility, leg raise, push up, and rotary stability. This effect also influenced changes in lower extremity function. The spinal stabilization exercise significantly improved right and left extension in peak torque (p<.05), right flexion (p<.01), and left flexion (p<.001). With regard to changes in total work, the results showed a significant difference in left flexion (p<.01), but it indicated non-significant differences in right extension, left extension, and right flexion (p>.05). In average power, differences were significant in right extension (p<.05) and right and left flexion (p<.01), but it was non-significant in left extension (p<.05).
골반 교정 운동과 요부안정화 운동이 검도선수들의 코어 근육 기능에 미치는 영향
권태동(Kwon, Tae-Dong),윤성덕(Yoon, Seong-Deok),박기덕(Park, Gi-Duck) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.6
In the current study, a short-term corrective pelvic exercise and lumbar stabilization exercise were performed 12 times to elite kendo (Japanese fencing) players with chronic back pain to find out changes in the muscular functions of the core muscles. Ten elite kendo players at K University, who have chronic back pain, were selected as subjects of this study, and using gym ball and togu, corrective pelvic exercise and 12 times of short-term stabilization exercise were performed, respectively, on subjects. Using an isokinetic equipment, Cybex Humac Norm ; Back Joint system (USA), muscle strength of lumbar during flexion and extension was measured, and the result is as follows. In the analysis of the muscle function of lumbar at 60˚ angular velocity, the peak torque trunk extension and average power showed significant difference (p<.05). 2. In the analysis of the muscle function of lumbar at 60˚ angular velocity, there was significant difference in the peak torque trunk flexion (p<.05) and extension (p<.01). In addition, the total work trunk flexion and extension also showed significant difference (p<.01). 3. In the analysis of the muscle activity of lumbar at 240˚ angular velocity, there was significant difference in peak torque trunk flexion (p<.01) and extension (p<.05). Integrating the results of the current study, short-term lumbar stabilization exercise appears to have positively influenced the lumbar muscle function of the elite kendo players with chronic back pain. Furthermore, we hope for the continued research and development of the rehabilitation program through more clinical applications.