• Wind and Structures
• /
• 제13권1호
• /
• pp.21-36
• /
• 2010

A new full scale testing apparatus generically named the Wall of Wind (WoW) has been built by the researchers at the International Hurricane Research Center (IHRC) at Florida International University (FIU). WoW is capable of testing single story building models subjected up to category 3 hurricane wind speeds. Depending on the relative model and WoW wind field sizes, testing may entail blockage issues. In addition, the proximity of the test building to the wind simulator may also affect the aerodynamic data. This study focuses on the Computational Fluid Dynamics (CFD) assessment of the effects on the quality of the aerodynamic data of (i) blockage due to model buildings of various sizes and (ii) wind simulator proximity for various distances between the wind simulator and the test building. The test buildings were assumed to have simple parallelepiped shapes. The computer simulations were performed under both finite WoW wind-field conditions and in an extended Atmospheric Boundary Layer (ABL) wind flow. Mean pressure coefficients for the roof and the windward and leeward walls served as measures of the blockage and wind simulator proximity effects. The study uses the commercial software FLUENT with Reynolds Averaged Navier Stokes equations and a Renormalization Group (RNG) k-${\varepsilon}$ turbulence model. The results indicated that for larger size test specimens (i.e. for cases where the height of test specimen is larger than one third of the wind field height) blockage correction may become necessary. The test specimen should also be placed at a distance greater than twice the height of the test specimen from the fans to reduce proximity effect.

• Smart Structures and Systems
• /
• 제20권3호
• /
• pp.385-396
• /
• 2017

The recent advancements in sensing technologies allow us to record measurements from target structures at multiple locations and with relatively high spatial resolution. Such measurements can be used to develop data-driven methodologies for condition assessment, control, and health monitoring of target structures. One of the state-of-the-art technologies, Fiber Optic Strain Sensors (FOSS), is developed at NASA Armstrong Flight Research Center, and is based on Fiber Bragg Grating (FBG) sensors. These strain sensors are accurate, lightweight, and can provide almost continuous strain-field measurements along the length of the fiber. The strain measurements can then be used for real-time shape-sensing and operational load-estimation of complex structural systems. While several works have demonstrated the successful implementation of FOSS on large-scale real-life aerospace structures (i.e., airplane wings), there is paucity of studies in the literature that have investigated the potential of extending the application of FOSS into civil structures (e.g., tall buildings, bridges, etc.). This work assesses the feasibility of using FOSS to predict operational loads (e.g., wind loads) on chain-like structures. A thorough investigation is performed using analytical, computational, and experimental models of a 4-story steel building test specimen, developed at the University of Southern California. This study provides guidelines on the implementation of the FOSS technology on building-like structures, addresses the associated technical challenges, and suggests potential modifications to a load-estimation algorithm, to achieve a robust methodology for predicting operational loads using strain-field measurements.

• 콘크리트학회논문집
• /
• 제18권1호
• /
• pp.101-108
• /
• 2006

초고층건물에서 발생하는 부등축소량은 기둥과 코어를 연결하는 보와 슬래브에서의 부가응력을 유발하거나 파티션과 커튼월의 균열과 같은 문제 등을 유발하므로, 부등축소량의 영향을 최소화하기 위해 기둥축소량의 예측 및 보정이 정확히 이루어져야 하며, 구조안전성과 사용성의 관점에서 시간변화에 따른 초고층건물 기둥축소량의 정확한 예측이 필요하다. 기둥축소량에 영향을 주는 콘크리트의 재료물성치 중 콘크리트강도, 크리프계수, 건조수축계수 등의 변동성을 고려하여 확률론적 해석을 이용한 기둥축소량 예측을 하여야 한다. 본 논문에서는 41층 초고층 내력벽식 구조물을 예제로 하여 몬테카를로 기법을 이용한 확률론적 축소량을 구하고 축소량의 분포도를 조사하여 신뢰수준별 기둥축소량을 분석하였다. 초고층 내력벽식 구조물예제에서 현장계측된 변형값은 해석에 의한 결과값보다 전체적으로 작으며, 확률론적으로 신뢰구간 ${\mu}-1.645{\sigma}$(신뢰수준 90.0% 하한치)이내의 값을 나타내었다.

• 패션비즈니스
• /
• 제9권6호
• /
• pp.141-159
• /
• 2005

Targeting a film that is the medium of having powerful influence upon the masses, the present study examined about a role and characteristics in the movie costume, and a role of costume designers, which are shown in process of being changed the film costume. There are many designers who were in charge of the film costume, but the present study examined centering on designers who participated aiming to create the image of a character from the stage of manufacturing a movie. It presented and analyzed visual materials by dividing four genres such as a historical drama movie, a horror movie, a fantasy movie, and a modern-play movie, and by selecting a typical work. A Historical drama movie needs to be investigated costume by the historical background in a movie, but inside it was shown clothes that were elaborately reproduced and newly created. A horror movie plays a role of medium that reflects the human society and the internal mentality of a human being along with the attribute of entertainment. As a genre that requires much costume, make-up and special effect aiming at dramatic effect, a role of film costume possesses great weight. As a fantasy movie is a field based on 'fiction' of a writer who creates a work, it is a field that requires creativity of a costume designer most. As a modern-play movie is what reproduces reality, it best reflects the phases of that time, and is the field that is influenced by costume or fashion trend. Costume needs to be designed in a bid to allow spectators to be inspired the wholly united and harmonious mood with leading a story of a movie, and the individual image.

• Geomechanics and Engineering
• /
• 제23권6호
• /
• pp.513-521
• /
• 2020

In this paper, due to the need for cutting cement-soil group pile composite foundation under the 7-story masonry structure of Zhenghe District and the shield tunnel of Zhengzhou Metro Line 5, a field test was conducted to directly cut cement-soil single pile composite foundation with diameter Ф=500 mm. Research results showed that the load transfer mechanism of composite foundation was not changed before and after shield tunnel cut the pile, and pile body and the soil between piles was still responsible for overburden load. The construction disturbance of shield cutting pile is a complicated mechanical process. The load carried by the original pile body was affected by the disturbance effect of pile cutting construction. Also, the fraction of the load carried by the original pile body was transferred to the soil between the piles and therefore, the bearing capacity of composite foundation was not decreased. Only the fractions of the load carried by pile and the soil between piles were distributed. On-site monitoring results showed that the settlement of pressure-bearing plates produced during shield cutting stage accounted for about 7% of total settlement. After the completion of pile cutting, the settlements of bearing plates generated by shield machine during residual pile composite foundation stage and shield machine tail were far away from residual pile composite foundation stage which accounted for about 15% and 74% of total settlement, respectively. In order to reduce the impact of shield cutting pile construction on the settlement of upper composite foundation, it was recommended to take measures such as optimization of shield construction parameters, radial grouting reinforcement and "clay shock" grouting within the disturbance range of shield cutting pile construction. Before pile cutting, the pile-soil stress ratio n of composite foundation was 2.437. After the shield cut pile is completed, the soil around the lining structure is gradually consolidated and reshaped, and residual pile composite foundation reaches a new state of force balance. This was because the condensation of grouting layer could increase the resistance of remaining pile end and friction resistance of the side of the pile.

• Structural Engineering and Mechanics
• /
• 제85권3호
• /
• pp.381-391
• /
• 2023

The seismic performance of the tall building equipped with a tuned mass damper (TMD) considering soil-structure interaction (SSI) effects is well studied in the literature. However, these studies are performed on the nominal model of the seismic-excited structural system with SSI. Hence, the outcomes of the studies may not valid for the actual structural system. To address the study gap, the reliability theory as a useful and powerful method is utilized in the paper. The present study aims to carry out reliability analyses on tall buildings equipped with TMD under near-field pulse-like (NFPL) ground motions considering SSI effects using a subset simulation (SS) method. In the presence of uncertainties of the structural model, TMD device, foundation, soil, and near-field pulse-like ground motions, the numerical studies are performed on a benchmark 40-story building and the failure probabilities of the structures with and without TMD are evaluated. Three types of soils (dense, medium, and soft soils), different earthquake magnitudes (M_w = 7,0. 7,25. 7,5 ), different nearest fault distances (r = 5. 10 and 15 km), and three seismic performance levels of immediate occupancy (IO), life safety (LS), and collapse prevention (CP) are considered in this study. The results show that tall buildings built near faults and on soft soils are more affected by uncertainties of the structural and ground motion models. Hence, ignoring these uncertainties may result in an inaccurate estimation of the maximum seismic responses. Also, it is found the TMD is not able to reduce the failure probabilities of the structure in the IO seismic performance level, especially for high earthquake magnitudes and structures built near the fault. However, TMD is significantly effective in the reduction of failure probability for the LS and CP performance levels. For weak earthquakes and long fault distances, the failure probabilities of both structures with and without TMD are near zero, and the efficiency of the TMD in the reduction of failure probabilities is reduced by increasing earthquake magnitudes and the reduction of fault distance. As soil softness increases, the failure probability of structures both with and without TMD often increases, especially for severe near-fault earthquake motion.

• Child Health Nursing Research
• /
• 제6권2호
• /
• pp.144-157
• /
• 2000

This study was done to understand nonpharmacologic pain management for pediateric patients and nurses' knowledge and attitudes toward it. The aim of this study was that which method did the patient's use according to the nurses' age, and how did they effectively use these methods in their field. The subjects of this study were 77 nurses working in the Pediatric unit in the Kyung Medical Center from September 2 to 15, 1999 using questionnaire form. The results of this study were as follows : 1. We divided the subjects into four groups : Younger than one year old, 1-6 years, 6-12 years, 12-18 years group. In the group younger one year old, most of the nurses participating in this study used speaking in soft quiet tones, supportive touch, toys, pacifiers. In the group of 1-6 years, they used speaking in soft quiet tones, toys, distracting attention, story talking, and visual stimulus. In the group of 6-12 years. they used pop-up books, providing information, cold therapy, speaking in soft quiet tones, supportive touch. In the group of 12-19 years, most of them used providing information, controling respiration and supportive touch. 2. The effective nursing intervention used in their field are speaking in soft quiet tones, pacifiers and nesting with blanket in the group of younger than one year old. Un the group of 1-6 years old, speaking in soft quiet tones, toys, and supportive touch were effective method in the control of nonp-harmacologic pain management. In the group of 6-12 years old, story talking, supportive touch, and speaking in soft quiet tones were effective method and in the group of 12-18 years old, providing information, cold therapy and supportive touch were effectively used to control nonpharmacologic pain management. 3. To compare the general characteristics and non-pharmacologic pain nursing intervention, in the group of younger than one year, touching stimuli is widely used. In the groups of 1-6, and 6-12 years old, visual and audio method were widely used. In the group of 12-18 years old, sensitive intervention were used as well as education, information and guided imagery. In conclusion, there was no significant difference in nurses' demographic characteristics, child's age and nonpharmacologic pain management. There was significant difference only in the nurses working area, that is nurses working in the surgical department used more audio-visual-tactile pain management methods than medical department.

• 공연문화연구
• /
• 제23호
• /
• pp.313-346
• /
• 2011

판소리작품 필사본을 읽다 보면, 방각본이나 창본 등 다른 이본에는 보이지 않는 생소한 내용이나 장면을 드물지 않게 발견하게 된다. 이러한 현상을 보고, 해당 이본의 작가는 어떠한 목적으로 그처럼 생소한 내용이나 장면을 설정했을까 하는 의문을 가지게 되었는데, 이러한 의문이 본고의 출발점이다. 다른 이본에는 존재하지 않아 공유성이 거의 없는 내용이나 장면은 해당 이본의 작가가 새롭게 창조한 것이라고 볼 수 있다. 그리고 그러한 이본은 대개 독서물로 유통된 작품이라고 판단된다. 그래서 본고에서는 일부 <춘향전> 필사본을 대상으로, 생소한 내용이나 장면에 초점을 맞춰, 판소리 독서물 탄생에 개재된 기반 사유를 추론해 보았다. 그 결과 첫째, <춘향전> 독서물 중에는 작가가 자신의 지식을 현시하기 위해 전에 없던 사설과 장면을 창조한 예를 볼 수 있었다. 이에 해당하는 이본으로는 김광순소장28장본 <별춘향가>, 사재동소장87장본 <춘향전>, 홍윤표소장154장본 <춘향전> 등이 있다. 이들 이본에 나타난 지식의 현시는 19세기 전후에 폭넓게 부상한 지식문화의 영향을 크게 받은 것으로 생각된다. 둘째, 일부 <춘향전> 이본을 보면 마치 조선후기의 연희 현장을 재현한 듯한 모습을 발견하게 된다. 이에 해당하는 이본으로 본고에서 주목한 것은 경상대소장75장본 <춘향전>과 계명대소장52장본 <춘향전>이다. 전자에는 주점 여객들의 이야기판, 판소리명창의 판소리판이 장면화되어 있고, 후자에는 왈자들의 연희판이 장면화되어 있다. 이러한 특징은 해당 이본의 작가가 조선 후기 당대에 흔히 접할 수 있었던 연희판을 자신의 작품 속에 재현해 보려는 목적이 있었기에 나타난 것으로 생각된다. 실제로 조선후기 연희 현장에는 판소리가 다른 예능들과 늘 함께 있었다. 판소리의 이러한 존재 환경이 판소리 작가에게 주목되었고, 그 결과로 독서물에 연희판을 재현한 듯한 장면이 등장할 수 있었다고 본다. 셋째, 일부 <춘향전>에는 양반권력을 풍자·비판하려는 목적이 좀 더 강화된 모습을 볼 수 있다. 이에 해당하는 이본으로는 충남대소장72장본 <춘향전>과 그 계열, 박순호소장59장본 <춘향전>과 그 계열이 있다. 양반권력에 대한 퐁자와 비판은 판소리작품이면 거의 모두 공유하는 것인데, 위 계열의 작가는 다른 이본에는 없는 내용과 장면을 새롭게 설정하여 그 점을 좀 더 강화했다.

• 한국주거학회논문집
• /
• 제17권4호
• /
• pp.111-117
• /
• 2006

The harmfulness of HCHO and VOCs from construction material and furniture has been increased gradually. It must be need to prevent pollution materials' accumulation indoor effectively and to remove very small amount of harmful pollution materials in various plans, because these kinds of pollution materials greatly affect human body, Therefore, this study is focused to find out the improvements of Indoor Air Quality in execution of natural ventilation and bakeout to reduce indoor chemical pollution materials or not. After effects of indoor air quality by natural ventilation and bake-out being examined, it is follows the conclusion. As for the density change of TVOC and Toluene according to time lapse, in case the middle and high-story areas have bake-out, the density increased once, but it showed the gradual decrease after bake-out was stopped, and it was shown that it exceeded the standards recommended for newly built apartment. The bake-out is effective to discharge the HCHO and TVOC from the construction material and the furniture, and the natural ventilation is effective remove the indoor pollution materials.

• Steel and Composite Structures
• /
• 제16권2호
• /
• pp.221-231
• /
• 2014

The purpose of this study was to evaluate the cyclic behavior of steel column-tree moment connections used in steel moment resisting frames. These connections are composed of shop-welded stub beam-to-column connection and field bolted beam-to-beam splice. In this study, the effects of beam splice length on the seismic performance of column-tree connections were experimentally investigated. The change of the beam splice location alters the bending moment and shear force at the splice, and this may affect the seismic performance of column-tree connections. Three full-scale test specimens of column-tree connections with the splice lengths of 900 mm, 1,100 mm, and 1,300 mm were fabricated and tested. The splice lengths were roughly 1/6, 1/7, 1/8 of the beam span length of 7,500 mm, respectively. The test results showed that all the specimens successfully developed ductile behavior without brittle fracture until 5% radians story drift angle. The maximum moment resisting capacity of the specimens showed little differences. The specimen with the splice length of 1,300 mm showed better bolt slip resistance than the other specimens due to the smallest bending moment at the beam splice.