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Integrated Simulation and Optimization for the Whole Chain of CCS : CCS 전 공정 통합 시뮬레이션 및 최적화
Operation pressure of distillation column is one of the key variable for optimizing the required energy in a CCS process. It affects the steam drag point in power plant, the regeneration energy in capture process and the compression energy in liquefaction process. A new algorithm, which is less dependent on simulation, for determining optimal stripper pressure for CCS process using MEA as an absorbent is proposed based on the integrated simulation model. Total energy required is represented as a function of the pressure based on the equivalent work. The results show that the compression work can be reduced at high pressure while that for reboiler increases and the total energy can be represented as a decreasing function with the stripper pressure. The evaluated optimal pressure decreases as the terminal pressure increases, showing the crucial condition for determining operation pressure of stripper depends on the terminal pressure of liquefaction process. It is also shown that a general analytical solution for optimal pressure including both the capture and the liquefaction process cannot be made through differentiation based on Abel Ruffini theorem. The total energy required in the possible range of the pressure can be estimated directly using approximation with given input variables.
The economy and efficiency of the diaphragm part has been highly demanded in steel box girder bridge design. In this study, experimental tests were performed to measure both temperature and stress distribution of the diaphragm part in a 4 span steel box girder bridge which was under constructions. By carefully analyzing the results, the temperature loads were determined with a numerical formula. Also, the proper length of the vertical stiffener was presented here. And the determined temperature distribution and the proper length of the vertical stiffener were compared with the results of FE analysis. Then the temperature loads presented here were different from EURO code. And the proper length of the vertical stiffener was similar to ones of previous studies It was thought that the studied results could provide the basis for an economical and efficient design of the diaphragm part of steel box girder bridges and for the classified temperature loads in bridge design.
박태균 朝鮮大學校 産業大學院 2001 국내석사
The buildings are getting deteriorated as time goes by. studies on steel Reinforced concrete beams and great interest in rehabilitation and repair are increased. But as yet domestic specifications on steel Reinforced Concrete beams and strengthening designs have not been made. In this study, the structural strengthening of Steel Reinforced Concrete beams are evaluated by comparing internal shearing steel beams and no steel reinforced concrete beams. By making 13 test beams, glass fiber strengthening effects are examined in bearing capacity. Strengthening effects are proportional to cross sectional area, which shows the presently performed steel Reinforced Concrete beam designs are over-designed. in case of reinforced test beams, reinforced concrete beams and Steel Reinforced Concrete beams have 20% better flexural rigidify, strengthening effect than conventional ones.
This study was done to evaluate the effect of the skeletal factors of craniofacial structures in the patients complaining lip protrusion. For the study, comparative evaluation was performed between the group of lip protrusion consisted of 60 and the normal group consisted of 99 adult mate and female. The normal group was selected under the criteria of no skeletal discrepancy in craniofacial area, balanced facial esthetics and no history of orthodontic treatment. The results were as follows in the lip protrusion group: 1. The antero-posterior relationship of the mandible to the cranium was more retrognathic than the normal group (p<0.05). 2. The vertical relationship of the maxilla and mandible to the cranium was more divergent than the normal group (p<0.05). 3. The degree of protrusion of upper lip-alveola area was increased than the normal group (p<0.05). 4. The basal relationship between maxilla and mandible was showed Class Ⅱ tendency than the normal group (p<0.05). 5. The gonial an91e was greater than the normal group (p<0.05). 6. There were no significant difference in the cranial base flexure between the lip protrusion group and the normal comparative group.
산업단지 배후지역의 정주환경 특성에 관한 연구 : 경상북도를 사례로
본 연구는 경상북도 지역의 산업단지 배후지역을 대상으로 정주환경의 특성을 분석하 고, 이를 바탕으로 정주환경 개선을 위한 정책적 시사점을 도출하는 것을 목적으로 한 다. 산업단지 배후지역은 급격한 산업화와 도시화로 인해 다양한 사회적, 경제적 변화가 이루어지고 있으며, 이에 따라 주민들의 생활환경에 대한 요구가 증대되고 있다. 본 연 구는 기존의 통계자료와 공공 데이터 등을 활용하여 산업단지 배후지역의 주거지 기능, 생활 편의시설, 교통망, 환경적 요소 등 다양한 측면을 정량적으로 분석하였다. 또한, 경상북도 지역 내 산업단지 특성과 지역적 차이를 고려하여 정주환경의 문제점 도출 후, 이를 해결하기 위한 개선 방안을 제시하였다. 연구 결과, 산업단지 배후지역의 정주 환경은 산업화의 빠른 발전에 비해 생활기반시설이 상대적으로 부족하며, 교통 및 환경 문제도 주요한 이슈로 대두되고 있음이 확인되었다. 본 연구에서는 이러한 문제들을 해 결하기 위한 정책적 방향과 함께, 지역 주민들의 생활 수준 향상을 위한 실질적인 방안 을 제시하며, 향후 산업단지 배후지역의 지속 가능한 발전을 위한 기초 자료로 활용될 수 있을 것이다.
플라이애쉬-석회계의 수열반응에 있어서 부산석고의 첨가효과에 관한 연구
본 연구에서는 플라이애쉬와 석회를 주원료로 사용하여 수열합성 반응에 의한 규산칼슘계 재료의 제조에 있어서 수열반응조건 및 CaO/SiO₂비 변화와 부산석고의 첨가량 변화에 따른 수화생성물을 조사하였다. 수열반응온도 180℃에서 반응시간이 길어질수록 압축강도가 증가하였으며, 특히 CaO/SiO₂비가 0.80과 0.85의 조성에서 반응시간 2시간부터 토베모라이트가 생성되어 강도발현에 기여하였다. 부산석고의 첨가량이 증가할수록 토베모라이트상과 C-S-H(I)상이 관찰되었고, 2~4wt% 범위에서 토베모라이트상이 가장 잘 생성되어 강도 발현에 기여함을 확인하였다. 그러나 그 이상의 범위에서는 C-S-H(I)상이 더 발달하여 압축강도가 낮음을 확인하였다 It were investigated hydrate according to changes of hydrothermal reaction, additional amounts and the ratio of CaO/SiO₂that to make of materials of calcium silicate hydrate system by hydrothermal reaction using fly ash and lime. It was appeared at 180 degrees of hydrothermal reaction that increasing of compressive strength with increasing of reaction time. In the case of 0.80 and 0.85 of the ratio of CaO/SiO₂was shown the maximum compressive strength and production of the tobermorite phase within 2 hours of reaction time. It was observed the tobemorite and C-S-H (I) phases with increasing of additional amount of by-product gypsum. It confirmed optimum conditions to make of tobemorite in region of 2-4 wt % and found to be below of compressive strength because of develop of C-S-H (I) phase in above of optimum wt %.
12주간 속도기반 저항훈련과 일반 저항훈련이 고등학교 야구선수의 신체조성, 운동수행능력, 근기능에 미치는 영향
본 연구는 12주간 속도기반 저항훈련과 일반 저항훈련이 고등학교 야구선수의 신체조성, 운동수행능력(근력, 무산소성 파워, 순발력, 민첩성), 근기능(전신 반응, 등속성 근력)에 어떠한 영향을 미치는지 규명함으로써 고등학교 야구선수의 운동 수행능력을 향상시키고 경기력 향상에 대한 효과적인 방법을 제시하는 데 목적 을 두었다. 연구의 목적을 달성하기 위해 고등학교 야구선수 30명을 모집하여 두 실험집단에 각각 15명씩 무선할당 배정하였다. 연구기간 동안 두 실험집단은 사전에 설계된 12주간 주 3회 60분씩 각 그룹군의 훈련을 실시하였다. 자료처리 는 모든 변인의 사전 값에 대한 동질성 검사는 독립 t-test로 분석하였다. 동질 성이 확보된 변인들은 이원반복측정분산분석(two-way repeated measures analysis of variance(ANOVA))과 대비검증(contrast test)로 분석하였고, 동질성이 확보되 지 못한 변인(악력)은 공분산분석(analysis of variance, ANCOVA)으로 분석하 였다. 모든 자료처리는 SPSS 27.0 프로그램으로 분석하였고, 유의수준은 0.05로 설정하였다. 본 연구의 실험 결과는 첫째, 속도기반 저항훈련 그룹의 체중, 근육량, 체지방 률, BMI는 통계적으로 유의한 차이가 나타나지 않았다. 일반 저항훈련 그룹의 체지방률이 통계적으로 유의하게 감소하였으나, 체중, 근육량, BMI는 통계적으로 유의한 차이가 나타나지 않았다. 둘째, 속도기반 저항훈련 그룹의 배근력, 스쿼트 3RM, 데드리프트 3RM, 벤치 프레스 3RM, 서전트 점프, 제자리 멀리뛰기, 사이드 스텝은 통계적으로 유의하 게 증가하였으나 악력(좌), 악력(우), 윙게이트 최대출력, 윙게이트 평균출력, 윙 게이트 피로지수는 통계적으로 유의한 차이가 나타나지 않았다. 일반 저항훈련 그룹의 악력(좌), 배근력, 스쿼트 3RM, 데드리프트 3RM, 벤치 프레스 3RM, 서전트 점프가 통계적으로 유의하게 증가하였으나, 악력(우), 윙게 이트 최대출력, 윙게이트 평균출력, 윙게이트 피로지수, 제자리 멀리뛰기, 사이드 스텝은 통계적으로 유의한 차이가 나타나지 않았다. 셋째, 두 집단 모두 반응시간과 등속성 근력은 통계적으로 유의한 차이가 나타나 지 않았다. 넷째, 사전값의 동질성이 확보되지 않아 공분산분석으로 분석된 등속성 근력 (우, 무릎 관절 굽힘근)은 속도기반 저항훈련 그룹이 일반 저항훈련 그룹보다 낮 게 나타났다. 이상의 결과를 종합해보면 12주간의 속도기반 저항훈련은 고등학교 야구선수의 근력, 순발력, 민첩성에 긍정적인 영향이 있다고 판단되며, 12주간의 일반 저항훈 련은 체지방률 감소, 근력 및 순발력 향상 긍정적인 영향이 있다고 판단된다. The aim of this study was to investigate the effects of Velocity Based Training and Weight Training on body composition, exercise performance (strength, anaerobic power, explosiveness, agility), and muscular function (whole-body response, isokinetic strength) in high school baseball players . This study was conducted to propose effective training methods for improving athletic performance. Total subjects(N = 30.00) were recruited and then randomly assigned to either Velocity Based training group(n = 15, VBTG) or Weight Training group(n = 15, WTG). The subjects in the VBT had performed Velocity Based training(3 times per weeks and 60 minutes per session) for 12 weeks, and the subjects in the WT had performed Weight Training(3 times per weeks and 60 minutes per session) for 12 weeks. The baseline tests were analyzed by utilizing independent t-tests. When equality of variables was shown, two-way repeated measures ANOVA with contrast tests was used for analyzing. However, When Inequality of variable(grip strength), ANCOVA was utilized. All data was analyzed by using SPSS program 27.0 with alpha(0.05). The results of this study showed that, first, there were no statistically significant differences in body weight, muscle mass, body fat percentage, and BMI in the velocity-based resistance training group. In the general resistance training group, body fat percentage significantly decreased, but no statistically significant differences were found in body weight, muscle mass, and BMI. Second, in the velocity-based training group, there were statistically significant increases in back strength, squat 3RM, deadlift 3RM, bench press 3RM, vertical jump, standing long jump, and side steps. However, no statistically significant differences were found in grip strength (left), grip strength (right), Wingate peak power, Wingate average power, and Wingate fatigue index. In the general resistance training group, there were statistically significant increases in grip strength (left), back strength, squat 3RM, deadlift 3RM, bench press 3RM, and vertical jump. However, no statistically significant differences were found in grip strength (right), Wingate peak power, Wingate average power, Wingate fatigue index, standing long jump, and side steps. Third, Both groups showed no statistically significant differences in reaction time and isokinetic strength. Fourth, When ANCOVA was used, the isokinetic strength (right, knee joint flexor) in the VBT was lower than in the WT. These results indicate that 12 weeks of Velocity Based training had positive influence on strength, power, and agility in high school baseball players, These results indicate that 12 weeks of Weight training had positive influence on body fat reduction, strength, and power in high school baseball players.