• Wind and Structures
• /
• v.5 no.2_3_4
• /
• pp.89-100
• /
• 2002

Accidental gaseous losses from industrial processes can pose considerable health and environmental risks but assessing their health, safety and environmental impact is problematic. Improved understanding and simulation of the dispersion of emissions in the vicinity of storage tanks is required. The present study aims to assess the capability of the turbulence closures and meshing alternatives in a commercially available CFD code for predicting dispersion in the vicinity of cubes and circular cylindrical storage tanks. The performance of the $k-{\varepsilon}$ and Reynolds Stress turbulence models and meshing alternatives for these cases are compared to experimental data. The CFD simulations are very good qualitatively and, in many cases, quantitatively. A mesh with prismatic elements is more accurate than a tetrahedral mesh. Overall the Reynolds stress model performs slightly better than the $k-{\varepsilon}$ model.

• Korean Journal of Mathematics
• /
• v.7 no.1
• /
• pp.27-35
• /
• 1999

As seen from the ammonium chloride experiment (Chen & Chen [1], Roberts & Loper [11], the interface near chimneys has an up-rising shape and we observe thickening of mush next to chimney. We analyze the thermal boundary layer around chimney that forms as the mush is cooled locally by the fluid rising through the chimney. We obtain solutions of the temperature, the solid fraction, and the pressure in the chimney wall. Also, our expression of the pressure shows that the fluid flow can require a huge pressure in order to pass through the chimney wall if its permeability is very small. We present a simple analytic description of the up-rising shape near the exit of the chimney, due to the fact that the comparatively solute (i.e. $NH_4Cl$ in the case of the ammonium chloride experiment)-rich fluid near the chimney tends to crystallize as it is chilled by the rising jet of cold fluid in the chimney.

• KLA journal
• /
• v.23 no.1
• /
• pp.3-16
• /
• 1982

이 논문은 Stephen A. roberts and J. Michael Brittain,"Demand and supply patterns for Documents and data in the United Kingdom", Internatinal Social Scieme Journal, V.33, N.1(1981), pp50-71을 번역한 것이다. Stephen A. Roberts는 영국 Loughborough 대학교의 도서관정보연구학과, 도서관정보관리센터의 연구원이다. J. Michael Brittain은 동학과의 Senior Lecturer이다. 그들은 공동으로 Inventory in the Social Sciences(1975)를 편집했고, 이 잡지 V.28, N.4(1976)에 “Information Services in the Social Sciences를 기고했다. J. Michael Brittain은 "Information and its users: a review with special reference to the social science"(1970)의 저자이고, 이 잡지 V.31, N.4(1979)에 실은 ”Information Services and the Structure of Knowledge in the Social Sciences"의 저자이다.

• Korean Journal of English Language and Linguistics
• /
• v.1 no.2
• /
• pp.331-347
• /
• 2001

In this study I investigate two implicit arguments in English middles: discharged argument and event argument. I argue that in middle formation external argument is discharged and event argument is suppressed. The proposal can account for the problems with the previous studies (Williams 1981; Keyser and Reoper 1984: Roberts 1987: Fagan 1988, 1992: Chung 2000). When a middle derives from the corresponding transitive verb, the subject argument is discharged, being an implicit argument. Argument discharge is different from argument suppression in the passives and argument deletion in the ergatives. I also argue that event argument is suppressed in middle formation. Event argument suppression is supported by the following: (i) The transitive verbs are always eventive but the corresponding middles are stative, and (ii) the middles are underlyingly eventive, (iii) the middles are “adorned” by certain manner adverbials.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2004.05a
• /
• pp.73-76
• /
• 2004

Tapping mode atomic force microscopy (TM-AFM) utilizes the dynamic response of a resonating probe tip as it approaches and retracts from a sample to measure the topography and material properties of a nanostructure. We present recent results based on numerical techniques that yield new perspectives and insight into AFM. It is compared that the dynamic models including van der Waals and Derjaguin-Muller-Toporov(DMT) or Johnson-Kendall-Roberts(JKR) contact forces demonstrates that periodic solutions can be represented with respect to the approach distance and excitation frequency.

• Proceedings of the Korean Society of Fisheries Technology Conference
• /
• 2000.10a
• /
• pp.250-251
• /
• 2000

환경내 산소의 고갈은 패각의 폐쇄를 야기시키며, 생리적 반응은 종에 따라 차이가 있으나, 대체로 저산소에 대한 생리적 보상 기작으로서 수류의 pumping과 ventilation 그리고 혈중내 산소수송능력을 증가시킨다(Herreid, 1980). 산소가 감소된 수괴에서 대사를 조절할 수 있는 능력은 서식지에 따라 여러 종류의 패류에 대하여 잘 알려져 있으며(Bayne, 1967; Hamwi and Haskin, 1967; Brand and Roberts, 1973; Taylor and Brand, 1975; Shumway, 1983; Widdows and Wang 1991; Sobral and Widdows, 1997), 이와 같은 연구들은 산소소비율의 변화가 환경내 산소감소에 대한 대사반응으로서 노출시간과 개체크기, 먹이이용 및 생식주기와 같은 생물학적 요인에 영향을 받는다고 보고하였다(Taylor and Brands, 1975; Widdows and Wang and Wang, 1991). (중략)

• Proceedings of the Korea Concrete Institute Conference
• /
• 1996.04a
• /
• pp.129-134
• /
• 1996

Bonding strength of reinforcing material has been recognized to be the most important factor which determines the strengthening effect and the durability of repair work. The properties of bonding layers affects the stress distribution at the end of the plate, therefore the behavior of bonding layer has to be investigated. In this study, the stress distribution at the end of the bonded plate has been tested and compared with Roberts' analysis. Shear stress and vertical normal stress at the end of strengtening plate are analysized and the effedts of bonding layer thickness, plate thickness and plate length on the bonding behavior are tested. The test results showed that thickness is one of the most important factor, which is the thinner the thickness, the smaller the maximum stress.

• International Journal of Costume and Fashion
• /
• v.15 no.2
• /
• pp.79-91
• /
• 2015

Creativity is an ever-increasing research area related to fashion design, namely the documentation and dissemination of creative scholarship. The purpose of this project is to apply creative bridge or creative leap theory to the development of an existing designer's garment collection using the creative design process of an architect. A single case study design was used to investigate the phenomenon of design process creative leap using a direct observation. Results indicate the difficult challenge of producing new and individualized silhouettes for the marketability of clothing, it is apparent that new methods of fostering creativity in designers through non-traditional approaches would benefit the education of apparel designers. Through targeted design practice, educators and practitioners can apply the principles of scientific inquiry into design processes to solve a problem, address a challenge, or create based on personal inspirations.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.30 no.2 s.245
• /
• pp.135-140
• /
• 2006

In tapping mode atomic force microscopy (TM-AFM), the vibro-contact response of a resonating tip is used to measure the nanoscale topology and other properties of a sample surface. However, the nonlinear tipsurface interactions can affect the tip response and destabilize the tapping mode control. Especially it is difficult to obtain a good scanned image of high adhesion surfaces such as polymers and biomolecules using conventional tapping mode control. In this study, theoretical and experimental investigations are made on the nonlinear dynamics and control of TM-AFM. Also we report the surface adhesion is an additional important parameter to determine the control stability of TM-AFM. In addition, we proved that it was adequate to use Johnson-Kendall-Roberts (JKR) contact model to obtain a reasonable tapping response in AFM for the soft and high adhesion samples.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.12 no.4
• /
• pp.405-413
• /
• 1987

In this paper, we have discussed three-type median filters(SQUARE, CROSS, X-SHAPE) that preserving edge in an original image while reducing random noise was introduced for image enhancement and edge detection on radar image. Since radar image have a number of parts of curve, we compared results produced by edge detection operater proposed for improving the parts of curve with results of using the existing edge detection methods, such as Roberts, Sobel, Prewitt, Laplacian and Kirsch.