http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
임상연구 : 진통제와 환자 조절 진통(Patient-Controlled Analgesia)에 대한 수술 전 교육이 수술 후 진통제 사용량에 미치는 영향
박정헌 ( Jeong Heon Park ),권민아 ( Min A Kwon ),구명신 ( Myoung Shin Koo ),김용익 ( Yong Ik Kim ),김순임 ( Soon Im Kim ),김선종 ( Sun Chong Kim ),강진구 ( Jin Gu Kang ),조현성 ( Hyun Sung Cho ),이병달 ( Byung Dal Lee ),김갑수 ( G 대한마취과학회 2006 Korean Journal of Anesthesiology Vol.51 No.6
Background: The purpose of this study is to evaluate the patients` general perception about the analgesics and the effects of the preoperative education about analgesics and patient-controlled analgesia (PCA). Methods: One hundred patients scheduled for elective gastrectomy were randomly allocated into two groups. In control group (n = 50), patients were given conventional preanesthetic visit with questionnaire survey on PCA one day before operation. In study group (n = 50), patients were sufficiently explained about postoperative analgesia and PCA by anesthesiologist and given precise explanation sheet about PCA. Total amounts of drug used in PCA as well as rescue analgesics, the pain scores, and side effects were compared. Results: 62.2% of patients had much information from various sources that analgesics effects positively in the recovery phase, but actually 73.7% of patients considered that analgesics do not seem to have any influence on the recovery after operation. There was no difference between the amounts of total PCA used, rescue analgesics, and the pain scores. However, the educated patients complained less dizziness at postoperative days (POD) one. Also, the number of patients excluded from study due to the PCA discontinuation secondary to related side effects was less in educated patients (P = 0.025). Conclusions: Preoperative education about analgesics and PCA failed to demonstrate significant decrease in the amount of analgesics and of pain scores. However, it lowered the incidence of PCA discontinuation due to side effects. (Korean J Anesthesiol 2006; 51: 715~9)
박정헌(Park, Jeong-Heon),이철희(Lee, Chul-Hee),김철현(Kim, Cheol-Hyun),조원오(Cho, Won-Oh) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.8
This paper presents vibration characteristics of magnetorheological(MR) elastomer, whose elastic modulus are controllable by applied magnetic field. By using this property, the material can be applied to vibration absorber, so that the stiffness of the absorber can be changed and actively controlled according to the magnetic flux density. However, the various performances of MR elastomer depends on different polarized direction of particles by applied magnetic field and dimension during the manufacturing process. In this paper, in order to obtain the optimal characteristics of MR elastomer, MR elastomers with different types and dimensions are prepared for a series tests. Using this test setup, extent of natural frequency shifted against magnetic field at various excitation frequencies can be measured. Specimens are prepared with 3 types, as cylinder samples exposed to magnetic field vertically, horizontally and unexposed during cure, respectively. Also, a set of design variables are considered to produce MR elastomers. Through the modal tests of mass structure with MR elastomer, the optimal design as well as the polarization direction of MR elastomer is obtained among the various dimensions and 3 directional types of MR elastomers.
박정헌(Park, Jeong-Heon),홍성근(Hong, Sung-Geun),이광희(Lee, Kwang-Hee),이철희(Lee, Chul-Hee),김철현(Kim, Cheol-Hyun),조원오(Cho, Won-Oh) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.6
This paper presents a solution of the vibration reduction in the hollow shafts by using magentorehological( MR) elastomer. Proposed active damping structure is built by embedding the MR elastomers whose elastic modulus is controllable by an applied magnetic field. MR elastomers consist of synthetic rubber filled with micron-sized magnetizable particles. For reduction of vibration, dynamic damper of hollow shaft is designed by using MR elastomer and equipped in the hollow shaft for the application to drive shaft. Experiment results are shown through the experiments to confirm the effect of MR elastomer dynamic damper for vibration reduction. Thus, the designed damping structure can be applied to vibration absorber used in drive shafts as well as the propeller shafts.
박정헌(Jeong-Heon Park),이철희(Chul-Hee Lee),김철현(Cheol-Hyun Kim),조원호(Won-Oh Cho) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.4
This paper presents vibration characteristics of magnetorheological (MR) elastomer, whose elastic modulus are controllable by an applied magnetic field. By using this property, the material can be applied to vibration absorber, so that the stiffness of the absorber can be changed and actively controlled according to the magnetic flux density. However, the various performances of MR elastomer depends on different magnetically polarization direction and dimension during the manufacturing process. In this paper, in order to obtain the optimal characteristics of MR elastomer, MR elastomers with different types and dimensions are prepared for a series tests. Using this test setup, extent of natural frequency shifted against magnetic field at various excitation frequencies can be measured. Specimens prepared with 3 types which are exposed to magnetic field vertically, horizontally and unexposed during cure. Also, a set of design variables are considered to produce MR elastomers. Through the modal tests of mass structure with MR elastomer, the optimal design as well as the polarization direction of MR elastomer is obtained among the various dimensions and 3 directional types of MR elastomers.
임상연구 : 두부 하강, 외회전 자세에서의 내경정맥과 경동맥의 관찰
정익수 ( Ik Soo Chung ),권민아 ( Min A Kwon ),황희윤 ( Hee Youn Hwang ),박정헌 ( Jeong Heon Park ),여진석 ( Jin Seok Yeo ),김정수 ( Chung Su Kim ),함태수 ( Tae Soo Hahm ),이상민 ( Sang Min Lee ),조현성 ( Hyun Sung Cho ) 대한마취과학회 2006 Korean Journal of Anesthesiology Vol.51 No.1
Background: This study evaluated the position and relationship between the right internal jugular vein (IJV) and the surrounding external landmarks using ultrasonography. Methods: Fifty-four patients undergoing central vein access for cardiac surgery were enrolled in this study. The IJV, carotid artery (CA) and sternocleidomastoid muscle (SCM) at the cricoid cartilage level in 15˚ trendelenburg position with 30˚ head rotation were examined using a two dimensional ultrasound transducer of a TEE machine. Images of the vessels and the demographic data of the patients were recorded and analysed. Results: At the level of the cricoid cartilage, the position of the right IJV was medial to middle of the clavicular head of the SCM muscle in 26 cases (48.2%), lateral in 11 cases (20.4%) and just above the middle of clavicular head of the SCM muscle in 17 cases (31.5%). In 43 patients (79.6%), the IJV overlapped the CA anterolaterlly < 5 mm, and these cases were regarded as normal. Ten patients (18.5%) had a medially positioned IJV overlapping the CA more than 5 mm and the IJV was positioned lateral to CA in 1 (2%) patient. The mean ratio of the overlapped diameter and the diameter of the CA was 33.6% and the overlapping ratios were greater than 50% in 10 patients (31.4%). The mean skin-to-vein distance at the angle of 30˚ was 1.82 cm. Conclusions: In 18.5% of patients positioned in the 15˚ Trendelenburg position, with their head turned to the left 30˚, the IJV overlapped the CA medially more than 5 mm, which increased the risk of a carotid puncture using the blind technique. (Korean J Anesthesiol 2006; 51: 11~6)