중량 조절계수를 이용한 고층 건물 변위설계법 개발

박효선,서지현,Park, Hyo Seon,Seo, Ji Hyun 한국강구조학회 2005 韓國鋼構造學會 論文集 Vol.17 No.3

고층 건물 변위설계는 고층건물 설계의 핵심 기술 중의 하나이며, 재분배 기법은 실용적인 고층건물 변위설계법으로 인식되고 있다. 재분배 기법은 구조 물량을 재분배함으로서 전체 구조물량의 변화없이 제어하고자 하는 변위를 최소화시키는 방법으로서, 재분배기법 적용에 의해서 최종 얻어지는 물량은 초기 물량의 영향을 받게 된다. 초기 물량이 과다한 모델의 경우, 재분배 기법을 적용하면 허용 변위는 충분히 만족하지만 물량 측면에서는 그 만큼의 절감 여지를 내포하고 있다고 볼 수 있다. 그러므로 중량 조절계수를 구조정식화에 포함시켜서 변위설계시 초기 설계안의 물량에 영향을 받지 않는 고층건물 변위설계 기법을 개발하였다. 제안된 변위설계법을 프레임-전단벽 구조물의 변위설계에 적용하여 그 결과를 분석한 결과, 제안된 방법은 초기 물량의 영향을 받지 않으며 고층건물 변위설계가 가능하였다. Drift design is one of the core techniques in the structural design of high-rise buildings and resizing technique is regarded as a practical drift design method for high-rise buildings. In the resizing technique, the structural weight is re-distributed to minimize the target displacement without a change in structural weights. However, the structural weight determined from resizing algorithm is bound to the structural weight based on the preliminary design. Therefore, in this paper, a drift design method that can control the weight of the structure without causing drift control performance to deteriorate is proposed by incorporating the weight control factor in the formulation of resizing algorithm. The proposed drift design method is applied to the drift design of two frame-shear wall systems. The proposed drift design method, in this study, makes it possible to control both the drift and weight of a high-rise building.

SWG의 적용을 위한 기후변화시나리오 데이터 추출 모델 개발

박효선,장동우,최진탁,맹승진,염경택,Park, Hyo-Seon,Jang, Dong-U,Choe, Jin-Tak,Maeng, Seung-Jin,Yeom, Gyeong-Taek 한국수자원학회 2016 물과 미래(한국수자원학회지) Vol.49 No.5

LGFOS를 이용한 보-기둥 부재의 부재력 계측 기법 개발

박효선,백재민,이홍민,Park, Hyo-Seon,Baek, Jae-Min,Lee, Hong-Min 한국방재학회 2006 한국방재학회논문집 Vol.6 No.3

기존 대부분의 구조물 건전도 모니터링 시스템에서는 제한적인 위치와 범위에서의 변형률 계측이 가능한 국부 변형률 센서를 이용하여 구조물 또는 구조 부재의 부재력을 계측하고 이에 기반하여 구조 안전성을 평가하고 있다. 그러나 실 구조물의 부재력 계측을 통한 안전성 평가는 하중의 크기 및 분포에 대한 불확실성 등의 다양한 이유로 부재 내 최대응력 작용점을 정확하게 파악하기 어렵다. 이러한 경우 구조물의 사이즈에 비하여 센서의 길이가 미소한 국부 변형률 센서를 이용한 안전성 평가의 적절성은 센서의 위치 및 개수에 좌우되는 한계를 가지게 된다. 이러한 한계를 극복하기 위하여 센서의 수를 증가시키면 처리해야하는 데이터의 양과 비용이 증가하게 되므로 현실적인 적용성에 문제점을 가지게 된다. 그러므로 본 연구에서는 이러한 한계와 문제점을 극복할 수 있는 대안으로 장대광변형센서에 의한 평균변형률을 이용한 보-기둥의 부재력 계측 기법을 제시하였다. In structural health monitoring, the safety of structural members are assessed by the level of stress measured by various strain sensors based on different sensing mechanisms. Since most existing strain sensors used for health monitoring system can cover a relatively small range of structural members, it is very difficult to measure the maximum value of the member subjected to varying amount and types of loads with those point sensors. The reliability of assessed safety of a member may be improved by increasing the number of sensors. It may not be also realistic to increase the number of sensors to overcome these drawbacks. In this paper, a stress measuring method for beam-column members is developed by estimating the maximum stress based on the average strains obtained from long gauge sensor. The average strain from long gage fiber optic sensor is transformed into the maximum strain by multiplication of the modification factor derived in this research.

마중물

박효선(Hyo-Seon Park) 대한토목학회 2006 대한토목학회지 Vol.54 No.12

중첩 방법에 따른 성장기 상하악 절치 위치 변화에 대한 종단연구

박효선(Hyo-Seon Park),오민희(Min-Hee Oh),오희수(Heesoo Oh),조진형(Jin-Hyoung Cho) 대한치과의사협회 2021 대한치과의사협회지 Vol.59 No.8

This study investigated the positional changes of maxillary and mandibular incisors during growth and the difference of positional change according to the three superimposition methods. Lateral cephalographs including 10 subjects(7 males and 3 females) between 7-14 years old were used, which had been taken at University of California in San Francisco and kept at University of the Pacific. Four lateral cephalographs were selected based on chronologic age and development of dental occlusion. After tracing of cephalographs, superimposition was performed in three methods; based on cranial base, maxilla or mandible, and implants of maxilla and mandible. The repeated measure analysis of variance (ANOVA) and ANOVA with post-hoc analysis were performed. With growth, both maxillary and mandibular incisors showed changes in the anterior and downward directions, and the amount of positional changes was different according to the superimposition methods. As a result of comparing the changes of the upper and lower incisors according to three superimposition methods, the horizontal change of the upper incisor showed statistically significant differences between the three superimposition methods in all three periods. The change of the lower incisor showed a statistically significant difference only in the T3-T4 period, and no statistically significant difference in the other periods. In growing children, superimposition based on the facial bone shows that growth of the facial bones including the maxilla and mandible in contained together. This suggests that growth needs to be considered even when evaluating orthodontic treatment.

단위하중법을 이용한 철골구조물의 변위 제한

박효선(Hyo Seon Park),유은종(Eun Jong Yu),주영규(Young Kyu Ju),송화철(Hwa Cheol Song),안재현(Jae Hyen Ahn),박칠림(Chil Lim Park) 한국강구조학회 1996 韓國鋼構造學會誌 Vol.8 No.2

As the building increases in height, the lateral deformation of the building due to wind or seismic loads becomes of primary concern. The excessive lateral deformation or story drift causes failure of both structural elements and nonstructural elements. The calculated deformation and drifts at the final design stage must be check not to exceed the specified limits proportional to the building height. Thus, the amount of material required for a tall building is determined by the structural stiffness criteria rather than member strength criteria. While research activity has been reported in the literature on development of structural optimization algorithms based on sensitivity analysis, no practical algorithm has been reported on their application to structural design of tall buildings. Therefore, the selection of determining elements for the drift control of a tall building at the final design stage heavily depends on structural designer`s heuristics based on his design experience. In this paper, the unit load method for calculating displacement of structures are explored to identify the controling elements for lateral deformation and drift in a tall building. Based on the unit load method, the lateral displacements of the models are reduced by 49.1% and 39.4% without changing the total weights of the structures.

강화해협이 홍수 및 조석에 대하여 한강하류부에 미치는 영향 연구

박효선 ( Hyo Seon Park ),최계윤 ( Gye Woon Choi ),변성준 ( Seong Joon Byeon ) 한국수처리학회 2011 한국수처리학회지 Vol.19 No.4

The Ganghwa Strait is located in Han river estuary, where the Han river, Imjin river and Yeseong river meet. And the velocity is so fast in the narrow strait. Moreover, a great deal of flow discharge into the Gyeonggi bay by the periodically repeated tides. A great deal of river sediment that inflow from the upstream of Han river can be accumulated there or discharged into the adjoining shore. In this study, the variation of flow characteristics is analyzed in the Han river and Imjin river located in the Han river estuary, with and without the consideration of the Ganghwa Strait`s existence. The analysis of steady flow and unsteady flow was made utilizing the MIKE 11 Model. The simulation result shows that the maximum water level rose 8.21% when the design rainfall is increased during the flood period simulation with the closure of Ganghwa strait. And in the state of steady flow analysis, the maximum change rate is 8.25% when the designed flood was simulated with a return period of 200-year.

GPS를 이용한 고층건물의 수평변위 모니터링시스템

박효선(Park Hyo-Seon),손홍규(Sohn Hong-Gyoo),김일수(Kim Ill-Soo),박재환(Park Jae-Hwan) 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.5

초등학교 방과후 영어 수업에 나타난 학생-교사 상호작용 연구 Vol.20 No4

박효선(Park Hyo sun),박선호(Park Seon Ho) 한국초등영어교육학회 2014 초등영어교육 Vol.20 No.4

This study aims to analyze interactions between teachers and students in the first and second graders' after-school classes. The data was collected through classroom observations and audiotapes. The researcher's field notes and interviews with five teachers(two English native teachers, two Korean English native teachers, and a Korean English teacher) were also included. The results are as follows. First, most utterances observed were initiated by the teachers mainly through giving information, asking display questions, and giving directions to students in after-school English classes. Second, the most frequent type of students' utterances was dependent on the talks led by the teachers. Students' utterances also tended to be more active especially when they express their opinions to the teachers and fellow students. Third, activities from supplementary materials, rather than those from the textbook only, influenced more positively on students' active talks and stimulated interactions between teachers and students. Finally, the native language of teachers influenced on their classroom English use despite the fact that all teachers had excellent English competence. Based on these findings some suggestions are made for the after-school English programs for lower grade students in the future.

건축구조 헬스모니터링 - SHM과 AI

박효선(Park, Hyo Seon) 대한건축학회 2021 建築 Vol.65 No.5