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이택우,박순응,박문호,정세영 청운대학교 건설환경연구소 2012 청운대학교 건설환경연구소 논문집 Vol.7 No.1
With authentic and economic considerations of arch bridges, rise ratio, span ratio, and the shape of arch ribs have been mentioned as the most important elements. When adopting the shape of arch bridges in preliminary design process, this study suggests in addition to dead loads, live loads seismic loads should be determining design parameters. According to the result of analysis, the structures having rise ratio of 1/4 and span ratio of 1.00: 1.56: 2.67 show reduction of their member forces by 40% and moreover, increased structural stability by 10% especially in the case of having parabolic arch ribs. It needs to be considered to be the particular point that in the parabolic arch ribs, the reduced maximum displacement by 10% has been observed through an seismic analysis, which is 10% less than hyperbolic ones'. Consequently, optimum rise ratio can be 1/4. Especially under the limited field conditions, designing the structures with parabolic arch ribs can cause them structurally more stable. 아치교량의 미관과 경제성을 고려할 때 가장 중요한 요소가 라이즈 비, 경간 비, 아치축선의 형태이다. 본 연구에서는 아치교량의 여러 설계변수를 통해 현재 고려하고 있는 자중뿐만 아니라 활하중 및 지진하중을 결정인자로 추가하여 기본설계단계에서의 교량형태 선정 시 기초자료를 제시하고자 하였다. 해석결과 경간 비는 100:1.56:2.67, 라이즈 비는 1/4일 경우 주경간부 최대단면력이 40% 감소하였으며 아치리브부 형상은 포물선인 경우 구조적 안정성이 10%증가되었다. 내진해석결과 아치리브의 형태가 포물선인 경우 쌍곡선인 경우에 비해 아치리브부 최대변위가 10% 감소하였다. 기본설계단계에서 현장 여건으로 인한 경간비, 라이즈 비의 제약을 받을 경우 아치축선 형상을 포물선으로 설계하면 구조적 안정성을 높일 수 있을것으로 판단된다.
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이택우,정구인,이강헌 한국스포츠학회 2015 한국스포츠학회지 Vol.13 No.4
The purpose of this research was to contribute to materialization and systematization of the analysis of table tennis game contents and help the improvement of Korean players' athletic performance. To achieve those purposes, 100 games of total 10 players including 5 Korean national table tennis players and 5 Chinese players were analyzed. For the tool of research, analytic paper developed by Gang, Woo-Young(2009) was revised, supplemented and used. The analyzed data was divided into serve, receive, success/failure set, player's type, etc. and score getting and losing factors and attack succeeding rate of Korean players and Chinese players were compared. The results of this study were as follows. 1. Chinese players managed score and set more effectively than Korean players and operated games easily without giving lots of scores lost to opponent players. 2. Score getting rate of Chinese players by attack success was higher than that of Korean players by 7.6%. 3. Chinese players showed high score getting rate by forehand and backhand attack success and Korean players showed high score getting rate by opponent attack failure and opponent mistakes. 4. Chinese players showed high score-losing rate by forehand attack failure and backhand attack failure and Korean players showed high score-losing rate by opponent attack success and all kinds of mistakes. 5. In both Korean players and Chinese players, score getting rate was clearly lower during the receive than serve, but Korean players' width of reduction was relatively bigger than Korean players. 6. For the backhand attack success by type, shake-hand type is clearly higher than penholder type. 7. Korean players' score getting area was backhand, medium and forehand in order and their score losing area was backhand, forehand and medium in order. Chinese players' score getting and score losing area was backhand, forehand and medium in order. 8. Korean players' average number of rallies during the score getting and score losing was 4.09 and 4.98 and Chinese players' was 4.04 and 4.92. During the score getting of Korean and Chines players, rally was highest in three balls. And, it was the highest in four balls during the score losing.
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이택우,박순옹,박문호 청운대학교 건설환경연구소 2011 청운대학교 건설환경연구소 논문집 Vol.6 No.1
Considering the view and economic feasibility in arch bridges, the most important parameter is the rise ratio. The dead load only is usually considered to determine the rise ratio. In this research, the wind load is added to the factors of determination for the rise ratio, and then the problem of the rise ratio determination for the dead load only is analyzed. The member force under the combination of the live load and wind load is increased 70%. The variation of section force by wind load with the change of rise ratio is relatively big. Additional stability analysis is needed to understand correctly the behavior by wind load after determination of rise ratio by self load at the basic engineering step. If wind load and live load are considered, the optimum rise ratio is proposed as 1/6. 아치교량의 미관과 경제성을 고려할 때 가장 중요한 요소가 라이즈 비이며, 이러한 라이즈 비를 결정하는데 있어 현재는 자중에 의한 영향만을 고려하고 있다. 본 연구에서는 아치교량의 라이즈 비 검토 시 현재 고려하고 있는 자중 뿐만 아니라 풍하중을 라이즈 비 결정인자로 추가하여 자중에 의한 라이즈 비 결정이 가지고 있는 문제점에 대하여 검토하였다. 검토 결과 활하중, 활하중과 풍하중에 대해 부재력이 70%의 증가를 보여 라이즈 비의 변화에 따라 풍하중에 의한 단면력의 변화도 상대적으로 크게 나타났다. 따라서, 기본 설계 단계에서 자중에 의한 라이즈 비 선정 후 대상 교량의 풍하중에 의한 정확한 거동 파악을 위해 별도로 안정성 검토가 필요할 것으로 판단되며 풍하중과 활하중을 고려하는 경우 최적의 라이즈 비는 1/6로 판단된다.
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패널존과 점성감쇠기를 고려한 강골조내진설계모델의 최적설계
이택우,박순응 한국복합신소재구조학회 2020 복합신소재구조학회논문집 Vol.11 No.4
In this study, the steel moment resistance with panel frame (SMRPF) system was applied to determine the damping force and displacement by considering the panel zone to joint connection and calculating the shear each floor for the seismic load at the same time. The result indicates that the effectiveness of the damper that can secure seismic performance for structures with non-seismic design without changing the member cross-section is predictable. In addition, optimum design was performed by a genetic algorithm using an example from this study, and it was confirmed that the weight of the SMRPF steel frame structures considering the viscous dampers and panel zone was reduced by approximately 50% compared to the non-reinforced structure. 본 연구에서 적용한 SMRPF system은 구조물 접합부의 패널존을 고려하는 동시에 지진하중에 대하여 각층별 전단력을 산정하여 댐퍼의 감쇠력과 변위를 결정해준다. 이는 내진설계가 반영되지 않은 구조물에 적용할 경우 부재단면을 변경하지않고 내진성능을 확보 할 수 있는 감쇠기의 역량 결정이 가능함을 보여 주었다. 또한 본 논문에서 적용한 유전자 알고리즘을통해 최적설계를 수행한 결과, 무보강 구조물에 비해 점성감쇠기와 패널존을 고려한 SMRPF 강골조 구조물의 총 중량이 약50%이상 감소되는 것이 확인되었다.
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이택우,이기수 대한치과교정학회 1991 대한치과교정학회지 Vol.21 No.1
This study was undertaken to grope the correlation of the maximal bite force and toothcraniofacial structure. The maximal bite force of 76 adult male, aged 18-28(mean aged:23.4±2.2)years, was estimated and cephalometric headplates were measured, tabulated and statistically analyzed. The results were as follows. 1.59.61kg of bite force in first molar, 45.38kg in premolar and 17.10kg in central incisor were arranged. 2.The bite force was negatively correlated to gonial angle, mandibular plane angle, the angle between occlusal plane and mandibular plane, the angle between palatal plane and mandibular plane, and positively correlated to posterior height of face, length of mandibular body, length of ramus, facial depth in craniofacial structure. 3.The group with strong bite force showed small gonial angle, mandibular plane angle, the angle between occlusal plane and mandibular plane, the angle between palatal plane and mandibular plane, and long posterior height of face, length of mandibular body, length of ramus, facial depth. So they manifested the tendency to brachycephalic pattern, on the other hand, the group with weak bite force manifested the tendency to dolichocephalic pattern. 4.There is no correlationships between bite force and mesial inclination of premolar axis in this subject. 5.it is considered bite force have an effect upon craniofacial pattern, especially upon the lower face.
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