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인체 무게 중심 분할에 따른 500m 숏트트랙 스피드 스케이팅 출발 기술 분석
백진호,정남주,한기훈,이용구,윤동섭,이용식,Back, Jin-Ho,Chung, Nam-Ju,Han, Ki-Hoon,Lee, Yong-Goo,Yoon, Dong-Seob,Lee, Yong-Sik 한국운동역학회 2003 한국운동역학회지 Vol.13 No.3
The purpose of this study was to attempt new starting motion and supply present starting motion in the 500M short track speed skating according to the center of gravity position. The center of gravity position ratio was divided starting motion into five(type A : front 80%-back 20%, type B front 70%-back 30%, type C : front 50%-back 50%, type D : front 30%-back 70%, type E : front 20%-back 80%). The three dimension motion analysis with DLT(direct linear transformation) method was executed using two video cameras. The following conclusion was that It was appear that reaction and execution time in starting motion was the most short in type B. It was characteristic that step of skaters was shorten and center of gravity position ratio was not effect to change of the step in each event. It was appear that the displacement of type D and type E were longer than that type A and type B during the starting motion. It was appear that skill types of center of gravity position ratio to the front were lower than that to the back and contract a posture. Observing the above, it was conclusion that skill type B of center of gravity position ratio to the tent was more effect than that to the back. But it is important that these skill type was most used to the competition and estimate the result.
대학 골프 선수의 Pitching wedge 스윙동작의 운동학적 특성 분석
백진호,윤동섭,김재필,Back, Jin-Ho,Yoon, Dong-Seob,Kim, Jae-Phil 한국운동역학회 2003 한국운동역학회지 Vol.13 No.3
The purposes of present study were to determine the major check-points of golf swing from the review of previous studies, and to suggest additional information on the teaching theory of golf. The golf swing motion of 6 male and female elite university golf players were filmed with 16mm Locam II high speed cameras at the speed of 200f/s, and variables such as time, displacement, angle, velocity were calculated and analyzed by 3D Cinematography using DLT method. The results were: 1. Differences were shown in the ratio of weight distribution on the feet, cocking angle, take-back velocity, club-head velocity at impact depending upon the physical characteristics and club used for swing. 2. Time for the down-swing and impact were $0.27{\sim}0.29s$ in men and $0.29{\sim}0.32s$ in women, which was 1/3 of the time for the back-swing. Women showed longer total swing time than men because of longer time in back-swing, follow-through and finish. 3. Men showed larger range of motion in shoulder and knee joints than women, on the other hand women showed larger range of motion in hip joint than men. 4. Cocking motion and right elbow flexion were occurred at the top of back-swing and cocking release was occurred at the moment of impact. Maximum rotations of shoulder and hip joints were found between the top of back-swing and down-swing phase. 5. Women showed lower back-swing velocity than men, and men showed higher club velocity(men: $38.2{\sim}38.6m/s$, women: $35.1{\sim}36.4m/s$) than women.
Shin, Han-Back,Kim, Moo-Sub,Law, Martin,Djeng, Shih-Kien,Choi, Min-Geon,Choi, Byung Wook,Kang, Sungmin,Kim, Dong-Wook,Suh, Tae Suk,Yoon, Do-Kun Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.1
High levels for noise and a loss of true signal make the quantitative interpretation of nuclear medicine (NM) images difficult. An application of profile optimization using a sigmoidal function in this study was used to acquire the NM images with high quality. And the images were acquired by using three kinds of reconstruction method using each same sinogram: a standard filtered back-projection (FBP), an iterative reconstruction (IR) technique, and the sigmoidal function profile optimization (SFPO). Comparison of image according to reconstruction method was performed to show a superiority of the SFPO for imaging. The images reconstructed by using the SFPO showed an average of 1.49 times and of 1.17 times better in contrast than the results obtained using the standard FBP and the IR technique, respectively. Higher signal to noise ratios were obtained as an average of 12.30 times and of 3.77 times than results obtained using the standard FBP and the IR technique, respectively. This study confirms that reconstruction with SFPO (vs FBP and vs IR) can lead to better lesion detectability and characterization with noise reduction. It can be developed for future reconstruction technique for the NM imaging.
Back, Gern-Ho,Yu, Jong-Sung,Vadim Kurshev,Larry Kevan 國立 昌原大學校 基礎科學硏究所 1994 基礎科學硏究所論文集 Vol.6 No.-
EPR and electron spin-echo modulation (ESEM) spectroscopies have been used to monitor the location of Pd_(II) and its interaction with water, methanol, ethanol, ethene, benzene, carbon monoxide and ammonia in silicoaluminophosiphate type 34 (SAPO-34) molecular sieve containing Pd(II) by ion exchange. After activation at 600℃, three different Pd' species are observed: A_(1)(g_(⊥) = 2.177), A_(2)(g_(⊥) = 2.136) and A_(3)(g_(⊥) = 2.070) with a common g_(Ⅱ)= 2.92. These correspond to three different site locations in the framework. A_(1) is assigned to the least accessible site Ⅲ in the centre of a hexagonal prism, A_(3) to site I displaced from a six-ring into the ellipsoidal cage and A_(2) to the most accessible site Ⅳ near an eight-ring window based on adsorption of oxygen and hydrogen and ^(31)P modulations from the SAPO framework observed by ESEM. Oxygen and water oxidize Pd_(I) lons in an activated sample to Pd^(Ⅱ) ions complexed to O_(2)^(-), indicating water decomposition. Adsorption of methanol and ethanol causes a change in the EPR spectrum which indicates some relocation of Pd^(Ⅰ) to allow better coordination with one molecule of the alcohol. Exposure to ethene also changes the EPR spectrum, indicating interaction of Pd^(Ⅰ) with it. ESEM shows that the Pd^(Ⅰ) species coordinates to one ethene molecule. The adsorption of carbon monoxide results in a Pd^(Ⅰ) complex with three molecules of carbon monoxide based on resolved ^(13)C superhyperfine splittings. Upon adsorption of ammonia, one molecule of ammonia coordinates to Pd^(Ⅰ) based on resolved nitrogen hyperfine coupling.
보론강의 열간 딥드로잉시 공정변수에 따른 소재의 변형거동해석
이민식(M. S. Lee),백승철(S.C. Back),강충길(C. G Kang) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
Recently in the automobile industry, there have been several efforts to reduce the weight and enhance the safety of vehicles. In this study, the hardable boron steel sheet was used in hot press deep drawing process. Through hot press deep drawing, boron steel sheet alloys generally show a good formability, work hardening and a small amount of spring back. The main process parameters are punch speed, blank holding force and initial blank temperature. Experiments were performed at a constant temperature for the die and punch. The effects of the main process parameters were thoroughly investigated. After forming process, two main kinds of graphs were obtained ; (1) the graphs presenting relationship between punch load, blank holding force and forming depth and (2) the graphs presenting relationship between blank holding force, punch velocity and forming depth . Finally, the corresponding maximum punch load and maximum forming depth value were obtained for forming depth limited. Then regions of fracture and non-fracture were made with point in graph. Furthermore, the microstructural observations and hardness were conducted for different part of the formed boron steel sheets after die quenching.
Kooksun Lee,Ick Choy,Juhoon Back,Juyeop Choi 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
An improved sensorless operation scheme for permanent magnet synchronous machine (PMSM) is proposed. A sliding mode observer is employed to estimate the Back-EMF, with which the rotor position is estimated. To improve the robustness against the load torque variation, the disturbance observer (DOB) scheme is adopted so that it estimates the load torque and generates a compensating signal to approximately cancel it. Moreover, the transient response of the rotor speed has been improved in the sense that the settling time and maximum overshoot are reduced. Simulations and experiments show the effectiveness of the proposed scheme.
백영두 ( Young Doo Back ),구세관 ( Sae Kwang Ku ),최성훈 ( Seong Hun Choi ) 대구한의대학교 제한동의학술원 2010 東西醫學 Vol.35 No.4
Background: Precise anatomical knowledges are deemed essential to prevent complications following acupuncture. This study was designed to evaluate the thickness and width in the superficial group of back muscle to help reduce the adverse effect of acupuncture including iatrogenic pneumothorax following acupuncture. Material and Method: Subjects were 9 cadevars (8 men and 1 women ranging in age from 53 to 87 years). The thickness of back muscles including trapezius, levator scapulae, rhomboid minor, rhomboid major and the width of levator scapulae were measured. Result: The mean thickness of trapezius in superior angle and inferior angle was 9.1mm and 4.9mm respectively. The mean thickness and width of levator scapulae was 9.3mm and 27.3mm respectively. The mean thickness of rhomboid minor and rhomboid major was 5.0mm and 6.8mm respectively. Conclusion: The results of this study could be helpful for preventing iatrogenic pneumothorax following acupuncture.
Taeyoel Back,Junggyu Yoon 대한스포츠물리치료학회 2022 정형스포츠물리치료학회지 Vol.18 No.1
Purpose: This study aims to examine the pain, muscle characteristic, Flexion-Relaxation Phenomenon to the hamstring flexibility. Methods: This study has as its subjects 105 Chronic Low Back Pain patients and divides them into the group (HHF n=52) with the normal length of hamstrings according to AKE test and the group (HLF, n=53) tending to have shortened hamstrings. AKE (active knee extension) Test was conducted to evaluate the degree of hamstring flexibility. And to examine the pain, muscle characteristic, Flexion-Relaxation Phenomenon it was compared and analyzed by using the VAS, myotonePRO, SEMG Results: HHF showed more significant difference than HLF in the analysis on the muscle characteristic (p<.05). Conclusion: According to the analysis, the shortening of hamstrings is the factor that affects the muscle characteristic but Chronic pain, Flexion-Relaxation Phenomenon not affects