• Wind and Structures
• /
• 제16권6호
• /
• pp.629-660
• /
• 2013

This paper reviews the current state-of-the-art in the numerical evaluation of wind loads on buildings. Important aspects of numerical modeling including (i) turbulence modeling, (ii) inflow boundary conditions, (iii) ground surface roughness, (iv) near wall treatments, and (vi) quantification of wind loads using the techniques of computational fluid dynamics (CFD) are summarized. Relative advantages of Large Eddy Simulation (LES) over Reynolds Averaged Navier-Stokes (RANS) and hybrid RANS-LES over LES are discussed based on physical realism and ease of application for wind load evaluation. Overall LES based simulations seem suitable for wind load evaluation. A need for computational wind load validations in comparison with experimental or field data is emphasized. A comparative study among numerical and experimental wind load evaluation on buildings demonstrated generally good agreements on the mean values, but more work is imperative for accurate peak design wind load evaluations. Particularly more research is needed on transient inlet boundaries and near wall modeling related issues.

• Advances in Computational Design
• /
• 제8권1호
• /
• pp.37-59
• /
• 2023

Squat reinforced concrete (SRC) shear walls are a critical part of the structure for both office/residential buildings and nuclear structures due to their significant role in withstanding seismic loads. Despite this, empirical formulae in current design standards and published studies demonstrate a considerable disparity in predicting SRC wall shear strength. The goal of this research is to develop and evaluate hybrid and ensemble artificial neural network (ANN) models. State-of-the-art population-based algorithms are used in this research for hybrid intelligence algorithms. Six models are developed, including Honey Badger Algorithm (HBA) with ANN (HBA-ANN), Hunger Games Search with ANN (HGS-ANN), fitness-distance balance coyote optimization algorithm (FDB-COA) with ANN (FDB-COA-ANN), Averaging Ensemble (AE) neural network, Snapshot Ensemble (SE) neural network, and Stacked Generalization (SG) ensemble neural network. A total of 434 test results of SRC walls is utilized to train and assess the models. The results reveal that the SG model not only minimizes prediction variance but also produces predictions (with R²= 0.99) that are superior to other models.

• 한국정보처리학회:학술대회논문집
• /
• 한국정보처리학회 2022년도 추계학술발표대회
• /
• pp.402-404
• /
• 2022

Recent research has shown that deep learning models are vulnerable to adversarial attacks not only in the digital but also in the physical domain. This becomes very critical for applications that have a very high safety concern, such as self-driving cars. In this study, we propose a physical adversarial attack technique for one of the common tasks in self-driving cars, namely segmentation of the urban scene. Our method can create a texture on a wall so that it can be misclassified as a road. The demonstration of the technique on a state-of-the-art cityscape pretrained model shows a fairly high success rate, which should raise awareness of more potential attacks in self-driving cars.

• 미술이론과 현장
• /
• 제9호
• /
• pp.7-31
• /
• 2010

In this paper, I examine the development of the second stage of Chicano muralism and compare it with the first stage of the Chicano Mural Movement that was born out of the Civil Rights Movement. I then discuss the different aspects of the first stage in relation to the birth of institutionalized public art and question how Chicano murals influenced public art and, conversely, how mainstream public art transformed some of the attitudes and practices of Chicano muralism. Chicano murals initially functioned as a political mouthpiece for Chicano's human rights and as a tool to recover the Chicano people's cultural pride and legacy. However, the murals gradually developed into public art projects supported by the city or federal governments, who regarded them as an economic way to effectively communicate with the community. In this process of institutionalization, muralists became increasingly concerned with aesthetic quality and began to work more systematically. For example, amateur artists or community participants who produced the earlier murals were transformed into mural experts. Chicano essentialism and the politically volatile themes used previously were phased out and the new murals began to incorporate diverse subjects and people, for example, native culture, Blacks, and women. This phenomenon reflected the changing emphasis on multicultural understanding. This kind of institutionalization did not always draw positive results. Inadequate funds were the primary concern over the actual subject and creation of the mural work. Artists reduced the strong political metaphors and aestheticized the mural forms. However, their work was productive as well: thorough research on wall conditions and painting techniques was conducted and new processes and designs were developed. This paper examines the murals created for the 1984 Los Angeles Olympic Games, Judy Baca's works, and the Balmy Alley Mural Environment project in San Francisco's Mission District. Works by Las Mujeres Muralistas in Mission District, in particular, show case colorful patterns and the Latin American indigenous culture, exploring new interpretations of old icons and design. They challenged the stereotypical depictions of females and presented alternative visual languages that revised the male-centered mural aesthetics and elaborated on the aesthetics of Rasquachismo.

• International Journal of Aeronautical and Space Sciences
• /
• 제13권2호
• /
• pp.127-153
• /
• 2012

This paper presents an advanced computational method for the prediction of the responses in the frequency domain of general linear dissipative structural-acoustic and fluid-structure systems, in the low-and medium-frequency domains and this includes uncertainty quantification. The system under consideration is constituted of a deformable dissipative structure that is coupled with an internal dissipative acoustic fluid. This includes wall acoustic impedances and it is surrounded by an infinite acoustic fluid. The system is submitted to given internal and external acoustic sources and to the prescribed mechanical forces. An efficient reduced-order computational model is constructed by using a finite element discretization for the structure and an internal acoustic fluid. The external acoustic fluid is treated by using an appropriate boundary element method in the frequency domain. All the required modeling aspects for the analysis of the medium-frequency domain have been introduced namely, a viscoelastic behavior for the structure, an appropriate dissipative model for the internal acoustic fluid that includes wall acoustic impedance and a model of uncertainty in particular for the modeling errors. This advanced computational formulation, corresponding to new extensions and complements with respect to the state-of-the-art are well adapted for the development of a new generation of software, in particular for parallel computers.

• 농촌계획
• /
• 제18권1호
• /
• pp.17-28
• /
• 2012

Functional mismatch and thought and plan-less material use of recently built boundary barriers in rural areas should greatly degrade their amenity value as one of linear villagescapes, but, their present state-of-art basically necessary for problem-solving had never surveyed up to now. From this point of view, this study tried to investigate present stock quantities and qualities of boundary barriers in rural areas by sample studies on 21 case villages(7 types ${\times}$ 3 cases) and comparative analysis between the planned or improved and nots. Wall type was absolutely dominated in the structural terms, of which more than half was used cement block as building material and, therefore, grey-colored. More than half of total barrier length were fully shielded, while relatively partially shielded in the mountainous villages in open space and 'Cultural villages' with closed housing structures. Free standing style of barriers was shown along over two thirds of their total length, although not more than half in planned reclaimed villages. Especially, because of one-sided wall type structure, mismatched over-shieldness and poorer maintenance condition of the boundary barriers in peri-urban villages, there should be provided with very intensive improvement efforts for amenity barriers.

• Earthquakes and Structures
• /
• 제9권6호
• /
• pp.1251-1272
• /
• 2015

It is widely recognized that the preferred yielding mechanism for a hybrid coupled wall structure is that all coupling beams over the height of the structure yield in shear prior to formation of plastic hinges in structural walls. The objective of the study is to provide feasible approaches that are able to promote the preferred seismic performance of hybrid coupled walls. A new design methodology is suggested for this purpose. The coupling ratio, which represents the contribution of coupling beams to the resistance of system overturning moment, is employed as a fundamental design parameter. A series of nonlinear time history analyses on various representative hybrid coupled walls are carried out to examine the adequacy of the design methodology. While the proposed design method is shown to be able to facilitate the desired yielding mechanism in hybrid coupled walls, it is also able to reduce the adverse effects caused by the current design guidelines on the structural design and performance. Furthermore, the analysis results reveal that the state-of-the-art coupled wall design guidelines could produce a coupled wall structure failing to adequately exhaust the energy dissipation capacity of coupling beams before walls yield.

• Imaging Science in Dentistry
• /
• 제37권3호
• /
• pp.149-156
• /
• 2007

Purpose: The purpose of this study was to measure the absorbed dose and to calculate the effective dose for periapical radiography done by portable intraoral x-ray machines. Materials and Methods: 14 full mouth, upper posterior and lower posterior periapical radiographs were taken by wall-type 1 and portable type 3 intraoral x-ray machines. Thermoluminescent dosemeters were placed at 23 sites at the layers of the tissue-equivalent ART woman phantom for dosimetry. Average tissue absorbed dose and radiation weighted dose were calculated for each major anatomical site. Effective dose was calculated using 2005 ICRP tissue weighted factors. Results: On 14 full mouth periapical radiographs, the effective dose for wall-type x-ray machine was 30 Sv; for portable x-ray machines were 30 Sv, 22 Sv, 36 Sv. On upper posterior radiograph, the effective dose for wall-type x-ray machine was 4 Sv; for portable x-ray machines doses were 4 Sv, 3 Sv, 5 Sv. On lower posterior radiograph, the effective dose for wall type x-ray machine was 5 Sv; for portable x-ray machines doses were 4 Sv, 4 Sv, 5 Sv. Conclusion: Effective doses for periapical radiographs performed by portable intraoral x-ray machines were similar to doses for periapical radiographs taken by wall type intraoral x-ray machines.

• 문화기술의 융합
• /
• 제6권1호
• /
• pp.335-341
• /
• 2020

노동에 몰입하던 삶이 가치와 생활을 중시하는 것으로 변화하면서, 개인은 학습, 지적 욕구 충족, 즐거움, 교류 등을 위하여 문화예술을 소비하거나 참여하고 있다. 최근에는 문화예술공간이 늘어나면서 공간은 문화와 예술을 창조하고 관람하며 교류하는 장소, 문화상품을 소비하는 장소로 탈바꿈하였다. 문화예술공간은 새로운 장르와 기술을 창조하고 개발하여 관람객에게 소통하고 참여하는 기회를 제공하여 미디어 작품을 이해하고 체화할 수 있게 한다. 따라서 미디어파사드는 관람객이 문화공간을 전시와 공연장소가 아닌 짧은 시간에 깊은 인상을 심고 작품과 문화공간에 더 쉽게 다가가고 이해하는 계기를 제공하여 해당 장소를 더 선호하게 만든다. 미디어파사드는 건물 외벽에 LED 조명을 설치해 미디어 기능을 구현하는 것으로서 아름다움과 정보를 전달하는 매개이다. 미디어파사드의 특성이 문화예술공간의 선호도에 미치는 영향을 분석하기 위하여 미디어파사드의 특성을 독립변수로, 문화예술공간의 선호도를 종속변수로 하는 연구모형을 수립하였다. 연구 결과 미디어파사드 특성의 디자인적 특성과 매체적 특성은 만족에 영향을 미쳤으며, 미디어파사드 특성의 매체적 특성은 추천과 재관람에 각각 영향을 미치는 것으로 나타나 문화예술공간에 많은 변화를 예고하고 있음을 시사하고 있다.

• 수완나부미
• /
• 제1권2호
• /
• pp.21-41
• /
• 2009

The Art of the Buddha's Life which depicts the life and before-life of Buddha flourished in Sanci and Bharhut in the ancient India and in Gandhara during the Kushan period. More than one hundred scenes from Buddha's life were represented in the form of relief sculpture or wall painting. They are found in Gandhara and Mathura during the Kushan period, Amaravati and Nagarjunakonda during the Satavahana period, in Mathura and Sarnath during the Gupta period, and during the Pala Period. They unfolded in various forms and styles according to the text(Buddhist scripture), layout, and expressive technique. In Mathura, where the Evolution of the Buddha image was made about the same time as in Gandhara during the Kushan period, the Buddha's life was presented in a number of scenes related to the sacred sites; in four or eight scenes. In the case of the Eight Great Events of the Buddha's Life, the four scenes out of eight were different from those that were represented in Sarnath during the Gupta period, manifesting a transitional period. The Gupta period is widely known as the time when the classic artistic style was established. The art of Buddha's Life was produced only in Sarnath during this period, and it was the time when the Eight Great Events of the Buddha's Life was established as iconography, providing a model for those of the Pala period. Also, it was the time when the single image of Buddha was produced such as the 'Buddha delivering his first sermon,' 'Buddha's Enlightenment,' and 'Buddha's Death,' thus showing the emergence of the single Buddha image from the narrative Buddha's life image. In this paper, a general introduction of the relief sculpture of the Buddha's life from Sarnath during the Gupta period was given. The art of Buddha's life gave great influences on that of China, Korea, Japan and Southeast Asia, and can be emphasized as an important subject in understanding the development of the Buddhist art in East Asia. A further study will be made on the art of Buddha's Life of Southeast Asia in the future, which will enhance the understanding of the art of Buddha's Life in East Asia as a whole.