• Structural Engineering and Mechanics
• /
• v.63 no.5
• /
• pp.607-615
• /
• 2017

This study presents optimum design of plane steel bridges considering corrosion effect by using teaching-learning based optimization (TLBO) method. Optimum solutions of three different bridge problems are linearly carried out including and excluding corrosion effect. The member cross sections are selected from a pre-specified list of 128 W profiles taken from American Institute of Steel Construction (AISC). A computer program is coded in MATLAB to carry out optimum design interacting with SAP2000 using OAPI (Open Application Programming Interface). The stress constraints are incorporated as indicated in AISC Allowable Stress Design (ASD) specifications and also displacement constraints are applied in optimum design. The results obtained from analysis show that the corrosion effect on steel profile surfaces causes a crucial increase on the minimum steel weight of bridges. Moreover, the results show that the method proposed is applicable and robust to reach the destination even for complex problems.

• Advances in Computational Design
• /
• v.1 no.3
• /
• pp.221-234
• /
• 2016

The present study dictates the behavior of shear wall under a seismic event in slender high rise buildings, and studies the effect of height, location and distribution of shear wall in slender high rise building with and without boundary elements induced by the effect of an earthquake. Shear walls are located at the sides of the building, to counter the earthquake forces. This study is carried out in a 12 storeys building using SAP2000 software. The obtained results disclose that the behavior of the structure is definitely affected by the height and location of shear walls in slender high rise building. The stresses are concentrated at the limit between the shear wall region and the upper non shear wall especially for shear walls without columns. Displacements are doubled between the shear wall region and the upper non shear wall especially for shear walls without columns.

• Archives of Pharmacal Research
• /
• v.22 no.6
• /
• pp.638-641
• /
• 1999

Cytotoxicities of four urushiols, congeners isolated from the sap of Korean lacquer tree (Rhus vernicifera Stokes), to 29 human cancer cell lines originated from 9 organs were evaluated. Their values of 50% growth inhibition were below $4{\mu}g/ml$, and showed cell line specific cytotoxicity. The present results is the first report on the cytotoxicity of urushiols suggesting that they would have an anticancer activity to human cancer cells.

• Bulletin of the Korean Chemical Society
• /
• v.22 no.12
• /
• pp.1375-1379
• /
• 2001

Monte Carlo simulations of hard-spheres confined in parallel hard walls have been carried out extensively at various densities and for various wall distances. The compressibility factors in the directions parallel and normal to the wall have been calculated from the radial free space distribution function (RFSDF) with the results showing that the compressibility factors normal to the wall are smaller than those in parallel direction and that a solid phase is formed in the direction normal to the wall while a fluid phase remains in the parallel direction. An order parameter is found to classify the phases whether a system (or a molecule) is in a fluid or a solid state. The compressibility factors of narrow wall are very small compared to those when the wall is put away. A plausible mechanism of the rise of sap in xylem vessel has been proposed.

• Journal of Microbiology and Biotechnology
• /
• v.28 no.12
• /
• pp.2071-2078
• /
• 2018

Xanthomonas oryzae pv. oryzae (Xoo) causes bacterial blight, which results in severe economic damage to rice farms. Xoo produces biofilms for pathogenesis and survival both inside and outside the host. Biofilms, which are important virulence factors, play a key role in causing the symptoms of Xoo infection. In the present study, we investigated the nutritional conditions for biofilm formation by Xoo. Although Xoo biofilm formation may be initiated by interactions with the host, Xoo biofilm cannot mature without the support of favorable nutritional conditions. Nitrogen sources inhibited Xoo biofilm formation by overwhelming the positive effect that cell growth has on it. However, limited nutrients with low amino acid concentration supported biofilm formation by Xoo in the xylem sap rather than in the phloem sap of rice.

• Journal of Advanced Navigation Technology
• /
• v.28 no.1
• /
• pp.159-162
• /
• 2024

This paper proposes a novel safety autonomous platform (SAP) architecture that can automatically and precisely manage on-site safety through ensemble artificial intelligence models generated from video information, worker's biometric information, and the safety rule to estimate the risk index. We practically designed the proposed SAP architecture by the Hadoop ecosystem with Kafka/NiFi, Spark/Hive, Hue, ELK (Elasticsearch, Logstash, Kibana), Ansible, etc., and confirmed that it worked well with safety mobility gateways for providing various safety applications.

• Digital Contents
• /
• no.3 s.70
• /
• pp.38-43
• /
• 1999

금융권 통합이 마무리되면서 IT 업체들의 고객관계관리(CRM:Customer Relationship Management) 시장 진출이 본격화되고 있다. 한국IBM을 비롯해 SAP 코리아, 한국컴팩컴퓨터, 한국SAS, 한국HP, 한국유니시스, 한국오라클 등이 CRM 관련 전담팀을 구성하여 솔루션을 출시하는 등 시장 선점을 위한 각축전이 전개되고 있다.

• 지반과기술
• /
• v.9 no.3
• /
• pp.43-54
• /
• 2012

• Geotechnical Engineering
• /
• v.28 no.9
• /
• pp.8-16
• /
• 2012

• Proceedings of the Korean Society of Environment and Ecology Conference
• /
• 2005.10a
• /
• pp.128-131
• /
• 2005