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RISS 인기검색어
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- 저자 : 임인혁(In-hyuk Im) (검색결과 8 건)
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임인혁,엄기매,김현숙,Im, In-Hyuk,Um, Ki-Mae,Kim, Hyun-Sook 대한물리치료과학회 2009 대한물리치료과학회지 Vol.16 No.2
Background: The purpose of this study was to investigate the effects of the body alignment on the type and weight of the bag. Methods: The Subjects(n=62) measured posture alignment and make out the questionnaire. The questionnaire item was type of the bag, weight of the bag, side which carries the bag, and time to carry the bag. The posture alignment measured by global posture system(GPS). GPS Measurement was ASIA, acromion process, medial malleolus on Frontal plane, ear, shoulder joint, knee joint, lateral malleolus on sagittal plane, and trunk rotation on transverse plane. Results: The backpack and shoulder bag was no significant. The width of the strap bag was not significant. The side which carries on shoulder bag was statistical significance(p<.05). The time to carry the bag was statistical significance on change of posture(p<.05). A bag weight was no significant. Conclusion: This research provides the direction and carry the bag in time for the posture. This study showed that type and weight of bag does affect body alignment. This indicates that there is an interaction that plays a crucial roles in the type and weight of bag and the body alignment.
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성인 남.여의 보행속도와 하지 근육의 긴장도 비교 연구
김현숙,엄기매,임인혁,Kim, Hyun-Sook,Um, Ki-Mae,Im, In-Hyuk 대한물리치료과학회 2009 대한물리치료과학회지 Vol.16 No.2
Background: The purpose of this study was to investigate the comparison between the walking speed and muscle tone of the lower extremity in male and female. Method: The experimental group was that 22 female and 24 male that participated this study. Subjects were measured walking speed and muscle tone. Muscle tone measured using myotonometer. Measured muscle were rectus femoris, vastus medialis, vastus lateralis, biceps femoris, semitendinousus, tibialis anterior, gastrocnemius. Result: The result of this study were that the walking speed were significantly significant(p<.01) in male and female. Muscle tone different in male and female that vastus medialis, vastus lateralis, tibialis anterior and gastrocnemius significantly significant(p<.05). Conclusion: This study showed that difference muscle tone and walking speed in male and female. This indicates that there is an interaction that plays a crucial roles in the walking speed and muscle tone.
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API X70 라인파이프 강재의 변형 시효 특성에 미치는 미세조직의 영향
이승완,임인혁,황병철,Lee, Seung-Wan,Im, In-Hyuk,Hwang, Byoungchul 한국재료학회 2018 한국재료학회지 Vol.28 No.12
This study deals with the effect of microstructure factors on the strain aging properties of API X70 pipeline steels with different microstructure fractions and grain sizes. The grain size and microstructure fraction of the API pipeline steels are analyzed by optical and scanning electron microscopy and electron backscatter diffraction analysis. Tensile tests before and after 1 % pre-strain and thermal aging treatment are conducted to simulate pipe forming and coating processes. All the steels are composed mostly of polygonal ferrite, acicular ferrite, granular bainite, and bainitic ferrite. After 1 % pre-strain and thermal aging treatment, the tensile test results reveal that yield strength, tensile strength and yield ratio increase, while uniform elongation decreases with an increasing thermal aging temperature. The increment of yield and tensile strengths are affected by the fraction of bainitic ferrite with high dislocation density because the mobility of dislocations is inhibited by interaction between interstitial atoms and dislocations in bainitic ferrite. On the other hand, the variation of yield ratio and uniform elongation is the smallest in the steel with the largest grain size because of the decrease in the grain boundary area for dislocation pile-ups and the presence of many dislocations inside large grains after 1 % pre-strain.
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전기히터방식 매연여과장치의 재생특성 향상을 위한 흡기드로틀링 연구
김홍석(Hongsuk Kim),한승환(Hanseung Han),조규백(Gyubaek Cho),정용일(Youngil Jeong),강봉균(Bong-Gyun Kang),임인혁(In-hyuk Im) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Application of an electric heater to a DPF system is one of attractive methods for active regeneration, but limitation of electric power available in vehicles has been a problem to be solved. In this study, intake throttling was studied to reduce the required electric energy of an electric heated DPF system. This study showed the decrease of 30-50% of intake air mass flow rate and increase of 20-60℃ of exhaust gas temperature by the intake throttling.<br/> When intake throttling was applied with the condition of EGR OFF, required electric energy for soot regeneration was reduced due to the effect of exhaust gas temperature increase.
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Urea-SCR 촉매가 코팅되는 전기히터 시스템의 NOx저감 성능에 관한 연구
최현하(Huunha Choi),김홍석(Hongsuk Kim),정용일(Yongil Jeong),임인혁(In-hyuk Im),박정한(Jeonghan Park),황재원(Jae-Won Hwang) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It is well known that a urea-SCR system can reduce NOx emissions of a diesel engine effectively. But the urea-SCR technology does not shows a good NOx reduction performance at low temperature exhaust gas conditions. This study introduces a newly developed urea-SCR catalyst coated electrical heater system. This system can reduce NOx emissions of a diesel engine effectively even though at low temperature exhaust gas conditions by increasing the surface temperature of SCR catalyst electrically. The study compares the NOx reduction performance of the newly developed urea-SCR system with a conventional system. This study shows that the new urea-SCR system has high performance and low NH₃ slip at the low temperature exhaust gas conditions.
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DOC 장착시 전기히터/촉매 복합 재생방식 매연여과장치의 성능향상에 관한 연구
최현하(Hyunha Choi),김홍석(Hongsuk Kim),정용일(Youngil Jeong),임인혁(In-hyuk Im),황재원(Jae-Won Hwang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
H-CDPF system regenerates the ceramic monolith filter both actively by an electrical heater and passively by a CDPF. The aim of this study is to compare the performance of the DOC coupled H-CDPF system with the DOC uncoupled H-CDPF system. In this study, the H-CDPF system was installed on the midium duty diesel engine of which already meets EURO-2 standards. The BPT of the DOC coupled H-CDPF system was about 40℃ lower than that of DOC uncoupled H-CDPF system. The DOC coupled H-CDPF system enhanced the active regeneration by the electrical heater at an idle engine condition. Also in the durability test which simulated actual city driving conditions, the DOC coupled H-CDPF system showed better regeneration characteristics.
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