Benthic attached diatoms (BADs), a major primary producer in lotic stream and river ecosystems are micro-sized organisms and require a highly magnified microscopic technique in the observation work. Thus, it is often not easy to ensure accuracy and precision in both qualitative and quantitative analyses. This study proposed a new technique applicable to improve quality control of aquatic ecosystem monitoring and assessment using BADs. In order to meet the purpose of quality control, we developed a permanent mounting slide technique which can be used for both qualitative and quantitative analyses simultaneously. We designed specimens with the combination of grid on both cover and slide glasses and compared their efficiency. As a result of observation and counting of BADs, the slide glass designed with the color-lined grid showed the highest efficiency compared to other test conditions. We expect that the method developed in this study could be effectively used to analyze BADs and contributed to improve the quality control in aquatic ecosystem health monitoring and assessment.

Dental brackets are widely used by the orthodontists to correct the misalignment of teeth in the mouth over a long period of time. In this study, finite element analysis of orthodontic bracket has been carried out for the observation of the stress distribution and deformation pattern in the different materials bracket (Stainless Steel, Ceramic, Titanium, Polycarbonate and Nitinol) when subjected to arch wire torsion and tipping force. The simulation results were further optimized with respect to bracket attachment surface. It was found that it is possible to know the change in result is correlated with the attachment surface of the stress and deformation due to change in diameter. The results confirmed that the finite element method has proved to be successful for proper design analysis for future development of the teeth bracket.

This paper develops a LED fishing lamp mounting system which slides in and out a LED fishing lamp mounting rack according to fishing situation of a fishing boat. Sliding mechanism of the LED fishing lamp mounting system is realized with a rack and pinion. Components of the LED fishing lamp mounting system are modeled with finite elements. In addition, the LED fishing lamp mounting system is modeled with rigid bodies. A rigid body model of the LED fishing lamp mounting system is interfaced with finite element component models to develop a computational model of the LED fishing lamp mounting system. A simulation is performed with the developed computational model for dynamic stress analysis of the LED fishing lamp mounting system. A bouncing, rolling, and pitching motion which describe a very rough sea are used as input conditions for the simulation. Six cases are considered for the simulation based on the number of fishing lamp and the location of sliding rack.

This paper develops a fishing lamp mounting system which opens or closes a mounting rack according to a fishing situation. A developing fishing lamp mounting system is designed using CAD software. Members composing the fishing lamp mounting system are modeled with finite elements based on 3D CAD model. In addition, the fishing lamp mounting system is modeled with rigid bodies. A rigid body model of the fishing lamp mounting system is interfaced with finite element component models to develop a computational model of the fishing lamp mounting system for dynamic stress analysis. This paper performs a simulation with bouncing, rolling and pitching motion which describe a very rough sea condition. This paper manufactures a fishing lamp mounting system which is designed with CAD software and analyzed dynamic stress with CAE technique.

Orthodontic is important to apply the optimal orthodontic force. The orthodontic bracket is deformed and the stress caused by tension and torsion of the wire. In this study, using the ANSYS the material that is currently widely used in orthodontic bracket material of stainless steel, ceramic, titanium, polycarbonate, by applying the nitinol analyzed the strain and the stress distribution on the bracket side. Simulation results on the stress distribution and deformation, and it was found a difference of each material.

LED는 전기에너지를 빛에너지로 전환하는 효율이 높기 때문에 차세대 광원으로 주목되고 있다. 그러나 조명성능을 향상시키기 위해서는 접합부에서 발생된 열을 적절히 방출하여야 하며, 밀폐형의 경우 방열판으로 전달되는 열을 외부로 배출하는 최적의 설계가 필요하다. 이 연구에서는 LED 조명의 캐비넷 냉각시스템에 설치되는 냉각팬의 위치를 수치해석의 방법으로 고찰한 결과 y/H=0.8 근방이 최적의 위치였다.

The detail design for overhead line can be divided into a MD(Mounting Diagram) design and pegging plan process. A MD design for a high-speed overhead line was performed by the design software. The MD design of Honam High-Speed catenary system was also performed the software. However, the MD design software for 400km/h overhead line is needed, because the tension of wires and conditions are different from 350km/h system. Therefore, in this study, a MD design software for 400km/h overhead line system is developed.