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- 저자 : 오환섭(Oh Hwan Sub) (검색결과 3 건)
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최광훈(Choi Kwang Hoon),오환섭(Oh Hwan Sub),김경난(Kim Kyung Nan) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
Electropolishing is used to improve mechanical properties such as surface roughness and corrosion resistance . In addition, It is used to remove deformed layer by machining process. In this study, Electropolishing behaviour of SUH35 has been evaluated in the acetic anhydride-percholic acid system. In order to success in the electropolishing, It is important to find the influence of parameter such as current density, electrode gap and electropolishing time, etc. As a result, there were three distinct regions of current density-voltage curve and good electropolished surface is obtained at plateau area(18V, 0.7A/㎠). Also It is possible to see optimum surface condition in the 3~7㎜ electrode gap and processing time over a period of time.
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심박변이도(心搏變移度)의 측정시간(測定時間) 표준화(標準化) 연구(硏究)
김규태 ( Kyu-tae Kim ),박영재 ( Young-jae Park ),박영배 ( Young-bae Park ),오환섭 ( Hwan-sub Oh ) 대한한의진단학회 2006 大韓韓醫診斷學會誌 Vol.10 No.2
Objectives: We performed this study to search the best time for HRV measuring and which index has the validity in a short term measuring. Methods: At first, three examiner measured electrocardiogram(ECG) of 5 people(4 male + 1 female) for 20 minutes in two times. and we devided ten regions (0-5, 5-10, 10-15, 15-20, 0-10, 0-15, 0-20, 5-15, 10-20, 5-20 minutes). After that we finded the HRV index for each regions. To evaluate the validity, we used Gage Repeatability and Reproducibility Study by MINITAB(ver. l3.20). If the `%Study Vat` is under 30 and `Number of Distinct Categories` is over 4, we could tell it has validity(repeatability and reproducibility). Results: 1) The region and HRV index has repeatability and reproducibility, was HF index in 10-15 minutes. The HF index in 15-20 minutes gained 27.41(%Study Var) and 5(Number of Distinct Categories). 2) The HF index in 10-15 minutes has the better reproducibility than repeatability. The value of measurement is under the control. There is consistency among the examiner. The distribution of measurement is not large. There is no interaction between examiner and each people. 3) The HF index in 10-15, 0-10, 0-15, 0-20, 10-20 minutes was not enough to gain the repeatability and reproducibility. But it had some meanings; %Study Var, Number of Distinct Categories is 32.68, 4 for 10-15 minutes, 34.43, 4 for 0-10 minutes, 34.44, 4 for 0-15 minutes, 33.56, 4 for 0-20 minutes, 32.07, 4 for 10-20 minutes. Conclusions: This study shows the best index of measuring HRV is the HF index in 15-20 minutes. So, from now on we should measure the HRV for 20 minutes and extract the HP index in 15-20 minutes. It must be the standard for HRV measuring.
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이동엽 ( Dong-yup Lee ),박영배 ( Young-bae Park ),오환섭 ( Hwan-sub Oh ) 대한한의진단학회 2006 大韓韓醫診斷學會誌 Vol.10 No.2
Background: As each human has a look in the face of oneself, he or she has a look of him or herself in the shape of the body also. And for the shape of the body which gives a big clue in diagnosis in musculoskeletal disorders. Therefor many means are used and developed for diagnosis through body shape or posture analysis for musculoskeletal disorders. X-ray, CT, MRI has been used for diagnosis through image in this way to tell about the inside of the human body. On the other side, moire topography was used for information about the exterior of the human body, but yet only minimal information such as the number of contour lines in each side was available. Therefor there were a few studies to use moire topography or other methods to get information about the surface of the human body in numeric values. The instrument used in this study which is a laser projection moire, is another trial to get numeric data about the surface of the human body. The instrument is composed of a laser projector and a computer software to recompose and analyse the image data into depth, height, angle and length. Objectives: The study was focused on whether the instrument is reliable for clinical use, and to seek the proper environment and posture for the examination, and among the data the software provides, which items are more reliable and useful. Methods: For reproductivity and repeatability, 4 testers tested 2 persons. And to know if the body shape changes according to the posture and which posture gives the most reliable data, the test was performed in 6 different positions. Results: Result, the instrument showed sufficient repeatability and reproductivity for clinical use. And among the items the software provides, the length of the back, the angle of the back in the sagittal and coronal plane showed reliable results. And there was difference in the results according to the posture, and Therefor, in following studies using this instrument or similar type of posture analysing instruments, the length of the back, the angle of the back in the sagittal and coronal plane could be reliable item to use.
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