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Electro-Rheological 유체를 이용한 무한폭 스퀴즈 필름 댐퍼 해석
정시영,최승복,조용철,Jeong, Si-Yeong,Choe, Seung-Bok,Jo, Yong-Cheol 한국정밀공학회 1992 한국정밀공학회지 Vol. No.
This paper addresses on the determination of damping coefficients of an infinitely long squeeze film damper operating with an electro-rheological (ER) fluid. The ER fluid behaves as Bingham fluid with an electric field dependent yield shear stress. AS phenomenological model of the fluid is adopted for the relationship between the yield shear and the intensity of the electric field imposed on the fluid domain. The model is then incorporated with the governing equation and associated boundary conditions of the squeeze film damper executing a circula centered orbit for the expression of dimension- less damping coefficients. Numerical simulation is performed to evaluate the performance improvement of the proposed squeeze film damper.
추나 요법을 적용한 경추 추간판 탈출증 척추 수술 실패 증후군 환자의 경과관찰 1례
정시영,이진복,Jeong, Si-Yeong,Lee, Jin-Bok 척추신경추나의학회 2011 척추신경추나의학회지 Vol.6 No.1
Objects : This study was to report a clinical effect of Chuna Treatment for HIVD-cervical spine Failed Back Surgery Syndrome(FBSS) patient. Methods : In order to alleviate both arm tingling, numbness and neck stiffness, the patient was treated by acupuncture therapy, cervical traction technique of Chuna treatment and conservative managements. To evaluate the effect of the treatment, Recovery rate of Hirabayashi, Verbal Numerical Rating Scale(VNRS) and Neck Disability Index(NDI) score were used. Results : VNRS and NDI were improved and Recovery rate was 100%. Conclusions : Korean Treatment can be effectively used for a patient with HIVD-cervical spine FBSS patient. Further clinical studies are needed to verify the findings.
김형우,원찬식,정시영,허남건,Kim, Hyeong-U,Won, Chan-Sik,Jeong, Si-Yeong,Heo, Nam-Geon 대한기계학회 2001 大韓機械學會論文集B Vol.25 No.12
Recent developments in microfluidic devices based on microelectromechanical systems (MEMS) technique find many practical applications, which include electronic chip cooling devices, power MEMS devices, micro sensors, and bio-medical devices among others. For the design of such micro devices, flows characteristics inside a microchannel have to be clarified which exhibit somewhat different characteristics compared to conventional flows in a macrochannel. In the present study microchannels of various hydraulic diameters are fabricated on a silicon wafer to study the pressure drop characteristics. The effect of abrupt contraction and expansion is also studied. It is found from the results that the friction factor in a straight microchannel is about 15% higher than that in a conventional macrochannel, and the loss coefficients in abrupt expansion and contraction are about 10% higher than that obtained through conventional flow analysis.
제양규,김종수,정시영,홍성욱,Je, Yang-Gyu,Kim, Jong-Su,Jeong, Si-Yeong,Hong, Seong-Uk 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.4
This paper intoduces a new lateral damper, which is simply called "leaf spring damper(LSD)", using the leaf springs. The principle and the contruction of this novel damper is described in detail. The theoretical analysis of the damper is presented. The advantages of this novel damper are discussed. Experiments are performed on four dampers which have the different stiffness and damping coeficients respectively. The dynamic coefficients of the dampers and the temperature rise of working fluid are measured as the vibration speeds. The experimental results are compared with the theoretical results and it is found a good agreement.agreement.
추나요법을 적용한 후종인대골화증을 동반한 경추척추관협착증 환자의 경과관찰 1례
이진복,이휘용,조이현,정시영,Lee, Jin-Bok,Lee, Hwi-Yong,Cho, Yi-Hyun,Jeong, Si-Yeong 척추신경추나의학회 2009 척추신경추나의학회지 Vol.4 No.1
Objects : This study was to report a clinical effect of Korean Treatment for a patient diagnosed by Computed Tomography as Cervical Spinal Stenosis with Ossification of posterior Longitudinal Ligament. Methods : In order to alleviate left shoulder pain and neck stiffness, the patient was treated by acupuncture therapy, herbal medicine, distilled herbal injection, cervical traction technique of Chuna treatment and conservative managements. To evaluate the effect of the treatment, Recovery rate of Hirabayashi, VAS(Visual Anlaogue Scale), NDI and ROM(Range of Motion) were used. Lhermitte's sign, Valsalva test, Distraction test, Compression test and Spurling test were carried out. Results : VAS, NDI and ROM were improved and Recovery rate was 100%. Conclusions : Korean Treatment can be effectively used for a patient with Cervical Spinal Stenosis with OPLL. Further clinical studies are needed to verify the findings.
추나 요법을 적용한 경수부 척수 손상 환자의 경과관찰 1례
이진복,조이현,임정균,정시영,Lee, Jin-Bok,Cho, Yi-Hyun,Im, Jeong-Gyun,Jeong, Si-Yeong 척추신경추나의학회 2010 척추신경추나의학회지 Vol.5 No.1
Objects : This study was to report a clinical effect of Chuna Treatment for a patient diagnosed by Magnetic Resonance Imaging(MRI) as Cervical Myelopathy. Methods: In order to alleviate shoulder pain and neck stiffness, the patient was treated by acupuncture therapy, herbal medicine, phamacopucture, cervical traction technique of Chuna treatment and conservative managements. To evaluate the effect of the treatment, Recovery rate of Hirabayashi, VAS(Visual Anlaogue Scale), NDI and ROM(Range of Motion) were used. Lhermitte's sign, Valsalva test, Distraction test, Compression test and Spurling test were carried out. Results: VAS, NDI and ROM were improved and Recovery rate was 100%. Conclusions: Korean Treatment can be effectively used for a patient with Cervical Myelopathy. Further clinical studies are needed to verify the findings.
이진복(Lee Jin-Bok),임정균(Im Jeong-Gyun),이형걸(Lee Hyung-Geol),정시영(Jeong Si-Yeong) 척추신경추나의학회 2011 척추신경추나의학회지 Vol.6 No.1
A 28-year-old woman presented with postpartum pelvic pain. The patient complained severe pain and couldn t walk at all a week after natal. Computed tomography and plain radiography of the pelvis didn t reveal abnormal condition except asymmetrical alignment. Chuna treatment isn t usually applicable to the patient after natal. But we tried Chuna treatment to adjust the asymmetrical alignment of pelvis by half degree of strength. The pelvic pain improved considerably after 2 weeks treatment, so we report this case to emphasize the role of Chuna treatment in the management of postpartum pelvic pain.
교통사고 염좌 환자에서 기질 및 성격에 따른 불안 우울 수준의 차이
김지영 ( Ji Youngkim ),김지훤 ( Ji Hwon Kim ),정시영 ( Si Yeong Jeong ),명성민 ( Sung Min Myoung ) 대한한방신경정신과학회 2010 동의신경정신과학회지 Vol.21 No.4
Objectives: The purpose of this study was investigated that correlation between Temperament and Character Inventory(TCI) and Beck Depression Inventory (BDI) , State-Trait Anxiety Inventory(STAI) in traffic accident patients. Methods: We investigated 30 cases of traffic accident patients. The patients answered that questionnaire about temperament, character and depression, anxiety. TCI and BDI, STAI were used to get to know that answers. Results: Depression is positive correlated with novelty seeking and harm avoidance in temperament. In character, depression is negative correlated with self directedness, and positive correlated with self-transcendence. Anxiety is positive correlated with harm avoidance in temperament. and negative correlated with self directedness. Conclusions: The results of correlation between TCI and BDI, STAI in traffic accident patients were consistent with previous studies in general person.