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The use of conservation drones in ecology and wildlife research
Bojana Ivošević,한용구,조영호,권오석 한국생태학회 2015 Journal of Ecology and Environment Vol.38 No.1
Conservation drones are remote-controlled devices capable of collecting information from difficult-to-access places while minimizing disturbance. Although drones are increasingly used in many research disciplines, their application to wildlife research remains to be explored in depth. This paper reports on the use of Phantom 2 Vision+ for monitoring areas in two national parks in South Korea. The first research area was conducted in Chiaksan National Park, and the sec¬ond in Taeanhaean National Park. The aim of this research is to introduce ecologists and researchers alike to conservation drones and to show how these new tools have are fundamentally helping in the development of natural sciences. We also obtained photographs and videos of monitoring areas within our test site.
Global hydroelastic analysis of ultra large container ships by improved beam structural model
Ivo Senjanović,Nikola Vladimir,Marko Tomić,Neven Hadžić,Šime Malenica 대한조선학회 2014 International Journal of Naval Architecture and Oc Vol.6 No.4
Some results on the hydroelasticity of ultra large container ships related to the beam structural modeland restoring stiffness achieved within EU FP7 Project TULCS are summarized. An advanced thin-walled girder theorybased on the modified Timoshenko beam theory for flexural vibrations with analogical extension to the torsionalproblem, is used for formulation of the beam finite element for analysis of coupled horizontal and torsional ship hullvibrations. Special attention is paid to the contribution of transverse bulkheads to the open hull stiffness, as well as tothe reduced stiffness of the relatively short engine room structure. In addition two definitions of the restoring stiffnessare considered: consistent one, which includes hydrostatic and gravity properties, and unified one with geometric stiffnessas structural contribution via calm water stress field. Both formulations are worked out by employing the finiteelement concept. Complete hydroelastic response of a ULCS is performed by coupling 1D structural model and 3Dhydrodynamic model as well as for 3D structural and 3D hydrodynamic model. Also, fatigue of structural elementsexposed to high stress concentration is considered.
Physical insight into Timoshenko beam theory and its modification with extension
Ivo Senjanović,Nikola Vladimir 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.48 No.4
An outline of the Timoshenko beam theory is presented. Two differential equations of motion in terms of deflection and rotation are comprised into single equation with deflection and analytical solutions of natural vibrations for different boundary conditions are given. Double frequency phenomenon for simply supported beam is investigated. The Timoshenko beam theory is modified by decomposition of total deflection into pure bending deflection and shear deflection, and total rotation into bending rotation and axial shear angle. The governing equations are condensed into two independent equations of motion, one for flexural and another for axial shear vibrations. Flexural vibrations of a simply supported, clamped and free beam are analysed by both theories and the same natural frequencies are obtained. That fact is proved in an analytical way. Axial shear vibrations are analogous to stretching vibrations on an axial elastic support, resulting in an additional response spectrum, as a novelty. Relationship between parameters in beam response functions of all type of vibrations is analysed.
Ivo Senjanović,Nikola Vladimir,조대승 대한조선학회 2012 International Journal of Naval Architecture and Oc Vol.4 No.3
Vibration analysis of a thin-walled structure can be performed with a consistent mass matrix determined by the shape functions of all degrees of freedom (d.o.f.) used for construction of conventional stiffness matrix, or with a lumped mass matrix. In similar way stability of a structure can be analysed with consistent geometric stiffness matrix or geometric stiffness matrix with lumped buckling load, related only to the rotational d.o.f. Recently, the simplified mass matrix is constructed employing shape functions of in-plane displacements for plate deflection. In this paper the same approach is used for construction of simplified geometric stiffness matrix. Beam element, and triangular and rectangular plate element are considered. Application of the new geometric stiffness is illustrated in the case of simply supported beam and square plate. The same problems are solved with consistent and lumped geometric stiffness matrix,and the obtained results are compared with the analytical solution. Also, a combination of simplified and lumped geometric stiffness matrix is analysed in order to increase accuracy of stability analysis.
Magnetic Textile Solid Phase Extraction of Cationic Dyes from Water Solutions
Ivo Safarik,Sindy Mullerova,Kristyna Pospiskova 한국섬유공학회 2020 Fibers and polymers Vol.21 No.12
Magnetically responsive acrylic nonwoven textile impregnated with negatively charged κ-carrageenan was used asan adsorbent for the extraction of cationic dyes using magnetic textile solid phase extraction (MTSPE). Polysaccharidemodified textile squares were characterized by Fourier transform infrared spectroscopy and scanning electron microscopy;both techniques confirmed successful modification of textile fibers. The extracted dyes were analyzed by spectrophotometryof the dyes eluted at low pH and by image analysis of the dyed textile. Dyes in the concentration range 0.1-2 mg/l weresuccessfully analyzed. It was clearly shown that MTSPE is an efficient preconcentration procedure for dye analysis.
The Regional Effects of Monetary Policy in Europe
( Ivo J. M. Arnold ) 세종대학교 경제통합연구소 (구 세종대학교 국제경제연구소) 2001 Journal of Economic Integration Vol.16 No.3
Since the inception of EMU, a common concern is that European monetary policy may have differential effects on EMU member countries. However, the reliance on cross-country evidence in the empirical literature risks overemphasizing the importance of cross-country differences in monetary transmission. This paper therefore takes a regional approach. Data from 58 European regions show significant cross-regional differences in the effects of monetary policy within the five largest EU countries. For all regions combined, I find a significant relationship between the impact of monetary policy and the industrial composition of regions, supporting earlier findings for the US. I conclude that at present the large European countries are regionally well-diversified enough to minimize the risk that ECB policy will produce a markedly different impact across countries.