• 한국생물공학회:학술대회논문집
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• 2003.10a
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• pp.179-183
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• 2003

• Proceedings of the Korean Vacuum Society Conference
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• 2001.02a
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• pp.75-75
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• 2001

• Proceedings of the PSK Conference
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• 2001.04a
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• pp.231.2-232
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• 2001

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1994.10a
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• pp.725-730
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• 1994

2차원 도면으로부터 3차원 입체형상으로의 재구성은 CAD/CAM에서 많이 연구되어 온 분야이다. 이 논문에서는 건축에서 쓰이는 3점 소실법을 이용하여, 자유곡선을 포함하는 하나의 투시도로부터 3차원 정보를 추출하고, 그 위상학적 관계와 loop detection 알고리즘을 통해서 면정보를 추출한다. 추출된 면정보를 입체 구조로 변환하고 연속성을 부여한다. 그리고 쉬운 사용자 인터페이스를 제공하여 사용자의 의도에 맞는 적절한 입체영상을 만들어 내고자 하였다.

• Bulletin of the Korean Chemical Society
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• v.27 no.12
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• pp.2045-2050
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• 2006

The interstitial hydrogen bonding in NiTi solid and its effect on the metal-to-metal bond is investigated by means of the EH tight-binding method. Electronic structures of octahedral clusters $Ti_4Ni_2$ with and without hydrogen in their centers are also calculated using the cluster model. The metal d states that interact with H 1s are mainly metal-metal bonding. The metal-metal bond strength is diminished as the new metal-hydrogen bond is formed. The causes of this bond weakening are analyzed in detail.

• Coupled systems mechanics
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• v.8 no.3
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• pp.219-245
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• 2019

The present research deals in two dimensional (2D) transversely isotropic magneto generalized thermoelastic solid without energy dissipation and with two temperatures due to time harmonic sources in Lord-Shulman (LS) theory of thermoelasticity. The Fourier transform has been used to find the solution of the problem. The displacement components, stress components and conductive temperature distribution with the horizontal distance are calculated in transformed domain and further calculated in the physical domain numerically. The effect of two temperature are depicted graphically on the resulting quantities.

• Advances in concrete construction
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• v.5 no.5
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• pp.451-468
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• 2017

The problem of reducing the self-weight of reinforced concrete structures is very important issue. There are two approaches which may be used to reduced member weight. The first is tackled through reducing the cross sectional area by using voids and the second through using light weight materials. Reducing the weight of slabs is very important as it constitutes the effective portion of dead loads in the structural building. Eleven slab specimens was casted in this research. The slabs are made one way though using two simple supports. The tested specimens comprised three reference solid slabs and eight styropor block slabs having (23% and 29%) reduction in weight. The voids in slabs were made using styropor at the ineffective concrete zones in resisting the tensile stresses. All slab specimens have the dimensions ($1100{\times}600{\times}120mm$) except one solid specimens has depth 85 mm (to give reduction in weight of 29% which is equal to the styropor block slab reduction). Two loading positions or cases (A and B) (as two-line monotonic loads) with shear span to effective depth ratio of (a/d=3, 2) respectively, were used to trace the structural behavior of styropor block slab. The best results are obtained for styropor block slab strengthened by minimum shear reinforcement with weight reduction of (29%). The increase in the strength capacity was (8.6% and 5.7%) compared to the solid slabs under loading cases A and B respectively. Despite the appearance of cracks in styropor block slab with loads lesser than those in the solid slab, the development and width of cracks in styropor block slab is significantly restricted as a result of presence a mesh of reinforcement in upper concrete portion.

• Research in Mathematical Education
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• v.17 no.2
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• pp.99-118
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• 2013

The present study focuses on the contribution of a teaching unit to the development of spatial ability of third graders in general and from a gender point of view in particular. The research population consisted of seventy-four pupils: thirty-seven pupils in the experimental group who attended the teaching unit and thirty-seven pupils in the control group. The spatial ability of all the pupils was examined by means of common tests which checked cognitive capabilities of spatial ability. The research findings illustrate an improvement in the spatial ability of the experimental group pupils following the participation in the teaching unit. Moreover, regarding the gender aspect, the findings show that there was no significant differentiation between the spatial ability of third grade boys and the spatial ability of girls of the same age group.

• Transactions of the Korean Society of Automotive Engineers
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• v.11 no.6
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• pp.93-100
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• 2003

This paper describes the thermoelastic instability arising from friction heat generation in braking and proposes the finite element methods to predict the variation of temperature and thermal deformation. In a conventional disc brake analysis, heat generation is only related with wheel speed and friction material and the interface pressure between disc and pad is assumed constant. But under dynamic braking conditions, the frictional heat causes the thermoelastic distortion that leads to more concentrated contact pressure distribution and hence more and more non-uniform temperature. In this paper, to complete the solution of the thermomechanically coupled problem, the linear relation model between pressure and temperature is proposed and demonstrated in examples of a simple two dimensional contact problem. And the two dimensional model has been extended to an annular three dimensional disc model in order to consider more realistic geometry and to provide a more accurate critical speed for automotive brake systems.

• Korean Journal of Pharmacognosy
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• v.33 no.3 s.130
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• pp.224-229
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• 2002

Sarcodon aspratus (Thelephoraceae), a native mushroom distributed in Korea and Japan has been widely used as a traditional food and folk medicines. Two proteoglycan polysaccharides, named SAP-A and SAP-B were isolated from the fruitbody of S. aspratus. Their molecular weight were determined as 6184.9 D, and 25749.2 D, respectively, by maldi-tof ms. The composition of sugar and amino acid of these compounds was also determined. The SAP-A showed potent antitumor activity. The $ID_{50}$ value of SAP-A was 8.2 mg/kg/day for ICR mice transplanted with solid sarcoma-180, and the elongation of lifespan effect was 167.4% for ICR mice transplanted with ascitic sarcoma-180. Moreover, the elongation life-span effect of SAP-A increased dose-dependently.