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열화율이 상이한 밀랍지의 초임계유체추출 탈랍처리효과 비교분석
정혜영(Hye Young Jeong),강영석(Young Suk Kang),고인희(In Hee Go),양은정(Eun Jeong Yang),최경화(Kyoung Hwa Choi) 한국펄프·종이공학회 2014 펄프.종이기술 Vol.46 No.6
This study aims to investigate the applicability of supercritical fluid extraction as a dewaxing technique to restore the beeswax-treated volume of the Annals of the Joseon Dynasty in various deterioration and damage conditions. Thus, this study analyzed the dewaxing efficiency and changes in physical and morphological properties before and after dewaxing, by applying the optimal supercritical fluid extraction dewaxing condition (70℃, 40 MPa, CO₂, Co-solvent 20% DCM, 2 hour) to 3 kinds of beeswax-treated paper with different deterioration rates (dry artificial aging of 10, 20 and 30 days at 120℃). After dry artificial aging at 120℃ for 30 days, the average molecular weight of the beeswax-treated specimen was 1.856×105 g/mol, showing deterioration about 80% of the beeswax-treated paper before dewaxing. It was a similar level to the molecular weight of the bees-waxed volume of the Annals of the Joseon Dynasty that has a higher degree of damage. As a result of analyzing the dewaxing efficiency through FT-IR analysis, this study discovered that it was possible to effectively dewax beeswax-treated paper in the range of deterioration 20 to 80% with this supercritical fluid extraction dewaxing technique applied. As a result of analyzing changes in the physical and morphological properties before and after dewaxing, the viscosity tended to decrease to a slight degree, and since no morphological deformation or damage of stencil fibers was found, it was concluded possible to conduct stable dewaxing through this supercritical fluid extraction technique.
복수정현파 소음제거를 위한 Filtered-x LMS 알고리듬의 수렴 특성에 관한 연구
이강승,이재천,윤대희,강영석,Lee, Kang-Seung,Lee, jae-Chon,Youn, Dae-Hee,Kang, Young-Suk 한국음향학회 1995 韓國音響學會誌 Vol.14 No.2
Filtered-x 최소 평균 제곱(LMS:Least Mean Square) 적응 필터가 능동 소음 제거에 사용될 때 적응 필터 출력과 오차신호 사이의 전달 특성 추정이 요구된다. 본 논문은 소음이 복구 정현파(multiple sinusoids) 신호로 구성될 때 filtered-x 적응 소음 제거 알고리듬을 유도하고 수렴 특성을 이론적으로 분석하였다. 알고리듬의 수렴 분석 결과, 알고리듬에 사용되 파라미터 추정의 부정확성으로 수렴 성능 저하를 가져오는데 위상 추정 오차와 추정 이득에 의하여 특정 지워진다는 사실을 알았다. 특히, filtered-x 최소 평균 제곱 알고리듬의 수렴은 위상 응답 추정의 정확도로부터 많은 영향을 받는다는 것을 보였다. 이 알고리듬에 대한 컴퓨터 모의 실험 결과 이론적인 수렴 분석과 잘 일치함을 보였다. Application of the filtered-x LMS adaptive filter to active noise cancellation requires to estimate the transfer charactersitics between the output and the error signal of the adaptive canceler. In this paper, we derive the filtered-x adaptive noise cancellation algorithm and analyze its convergence behavior when the acoustic noise consists of multiple sinusoids. The results of the convergence analysis of the filtered-x LMS algorithm indicate that the effects of the parameter estimation inaccuracy on the convergence behavior of the algorithm are characterized by two distinct components : Phase estimation error and estimated gain. In particular, the convergence is shown to strongly affected by the accuracy of the phase response estimate. Simulation results are presented to support the theoretical convergence analysis.
양재준(Jae-jun Yang),방정석(Jeong-Suk Bang),이병호(Byung-Ho Rhee),박태춘(Tae-Choon Park),강영석(Young-Seok Kang) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.11
본 논문에서는 항공우주연구원에서 개발중인 1단 저압 축류압축기 성능시험리그의 개발에 대한 내용을 소개하고자 한다. 성능시험리그는 유동 입구부, 동익단, 정익단, 축, 리그 하우징, 베어링 하우징 및 유동 출구부로 구성되어 있다. 로터와 회전축을 단순화하여 회전동역학 해석 결과를 바탕으로 회전축을 설계하고 입?출구 유로의 유동해석을 통해서 시험리그 형상설계를 최적화하였다. In this paper, explain to development of low pressure axial compressor performance test rig in KARI. Performance test rig consist of a entrance section, rotor, stator, shaft, rig housing, bearing housing and exit section. Test rig design structural optimization to rotor dynamics analysis of the simplified rotor-shaft assembly and flow analysis of entrance/exit section.
강영석 서울여자대학교 1987 서울여자대학논문집 Vol.16 No.-
Western-style archery contributes significantly to international amity, to nongove-rnmental diplomacy and to the enhancement of national glory. In addition, itis a useful adjustment in paysical training in our national defense. Technic without strength of body and mind may not win in a contest. The development of physical training and the economy can be an indicator of national power in theinternational community. So it is necessary to teach archery by stages, considering the real and national aspects. to cultivate the personality and nature though the analysis of necessary conditions in archery instruction, to determine the best way of body and mind development by training for college women's and to find worthwhile recreation, we analysed the following subjects: (1)The physical power and characteristics which are neessary for men in archery. (2)The promotion of archery byexamining the difficulties(obstruction factors) in archery activities. Under the above headings, we distributed questionnaires about archery activities from March 1, 1985 to April 30, 1986 among college women in Departments of Physical Training (70 women), French Literature, etc(280 women). The content of the survey follow: (1)Research concerning to western-style archery and analysis of interest and participation of western-style archery activities (2)Analysis of understanding in western-style archery: Analysis of recognition in western0style archery, training method of that and analysis of westernstyle archery effectiveness (3)Analysis of obstrnction factors to the westernstyle archery function: Analysis of obstruction factors in physical training, in hobby activities, and in body and mind cultivation. (4)Research of western-style archery training method: Study of the training way and analysis of the western-style archery effectiveness We showed the result of this research by percentages. For the promotion of this study, we suggest the following: (1)Characteristic of Archery: the physical, mental characteristics and that of instruments (2)Effectiveness of Archery: the 2 effectiveness of body and mind training, of beauty and health, and of generalization of archery (3)Factors of Archery Obstruction (4)Basic Body Strength: the necessity of body training, archery gymnastics in training and the implied effectiveness of archery instructions and the methods of generalization For the effectiveness of Western-style archery, we conclude and propose the further propagation of Western-style in archery in theory and practice
강도별 지속 운동이 호흡순환기능, 혈액가스성분 혈청 지질, 카테콜라민 및 초과 산소섭취량에 미치는 영향
강영석,박철빈 경희대학교 체육과학연구소 1997 體育學論文集 Vol.25 No.-
The purpose of the present study was two folds: first, to examine the pattern of changes in physiological variables manipulated by the level of aerobic exercise intensities (40%.55% and 70% of Vo2 max); second. the effects of the physiological variables on the volume of EPOC. The physiological variables of interest in this study were respiratory gas (Vo2, heart rate, RQ), blood lactate and glucose, serunl lipids(TG, FFA), and blood gas(pH, PO2, PCO2, EPOC(voluble, maintain time)). The subjects in this study were ten female university students majoring physical education. Their age ranged from 21 to 23 years old. Before the experiment starts, maximal load test was performed from all the subjects In order to determine individual-specific maximum oxygen consumption. During the experiment, the subjects exercised for 20 minutes on the treadmill at each level of exercise intensities. After exercise, the end-point of recovery period was determined by the point which the Vo2 returned to the level of rest. Two-way ANOVA with repeated measures on both factors and correlation analyses were conducted to obtain the results of the experiment. From these analyses the following conclusions was attained: 1.The mean value of EPOC during the recovery period was the highest at the 70% of exercise intensity, followed by the 55% and the 40% (6.34 kcal), As expected, the mean value of energy consumption during the exercise period showed the sable pattern. 2.The time taken from the end-point of 20 min exercise to the level of rest significantly increased as the level of exercise intensity increased. 3.The value of EPOC was positively related to the values of blood epinepirine, triglyceride, pH, PO2 among the 26 measured physiological variables for all three level of exercise intensities. From these results, it can be suggested that when we evaluate the total amount of exercise expenditure during 20-min exercise with the exercise intensity of 40%, 55%, and 70% of Vo2max, we should include the amount of EPOC(about 5%-10%) consumed the recovery period. Moreover, it was found that the energy consumption was maintainde at least 15 to 50 minutes after the end of exercise period when the aerobic exercise was conducted for 20-min with 70%(or less)of Vo2max.