서론 : 본 연구에서는 보조기의 전통적인 제작방법과 3D 프린팅 방법과의 비교를 통해 향후 임상 적용 가능성과 작업치료 교육 과정에의 도입 가능성에 대해 고찰하고자 한다. 본론 : 작업치료사들이 전통적으로 보조기를 제작하는 과정과 3D 프린팅 방법을 사용한 보조기 제작 과정을 알아보고 프 린팅 방식과 사용되는 재료, 신체를 측정하는 방법에 대해 비교하였다. 전통적인 제작방법이 가지는 한계와 3D 프린팅 방법에 의한 제작에는 각각의 장단점이 존재하였고 임상적으로 적용하기 위해서는 현실적으로 해결해야 할 부분이 존재 하였다. 결론 : 3D 프린팅 기술이 재활치료 분야에서 주목받기 시작하고 있어 향후 작업치료 분야에서도 임상적용이 될 날이 다가 올 것이라고 예측할 수 있다. 이러한 임상에서의 변화에 적응하고 새로운 시대에 맞는 새로운 치료적 적용을 위한 보조기 제작법을 교육할 필요가 있으며 기존의 전통적인 방법으로 손 보조기를 제작하는 방법을 교육함과 더불어 시대에 맞는 새로운 기술을 작업치료교육에 도입하기 위한 노력이 필요할 것이다.

선박에 부착된 수중생물은 선체에서 성장하면서 선박의 저항을 크게 증가시킬 뿐만 아니라 부착생물이 배와 함께 이동하면서 지역의 해양 생태계 교란을 야기시키기도 한다. 이에 따라 국제해사기구에서는 선체부착생물의 이동을 막기 위해 선체부착생물 제거 및 청소성능 평가 논의를 시작해 오고 있다. 본 연구에서는 소형선박에 사용되는 FRP(Fiber Reinforced Plastic), HDPE((High Density Polyethylene), CFRP(Carbon Fiber Reinforced Plastic) 재료의 시편을 격포항(전락북도)에 약 80일간 양생시킨 후 물 제트 노즐을 이용하여 부착생물 제거실 험을 수행하였다. 그 결과 김과 같은 해조류는 노즐과 시편과의 거리가 1.8cm, 100bar 일 때 제거되었지만, 따개비의 경우 200 bar 이상은 되어야 청소가 되는 것을 확인하였다.

Level 3 driving, which enters full-fledged autonomous driving, is becoming more common. And research on autonomous driving is growing rapidly. Therefore, there is a need for a hardware platform to implement autonomous driving, but the actual vehicle price is too high and the implementation conditions are very limited, so its usability is inevitably reduced. In this study, by providing an easy-to-access hardware platform for anyone to support autonomous driving research, compatibility with software platforms can be increased. As a result of this study, it is possible to conduct hardware platform and software platform education at the same time. Through this, trial and error due to errors in each of the two platforms can be reduced. In addition, various sensors, such as camera sensors and LiDAR sensors, were installed on the hardware platform, and a hardware platform capable of testing autonomous driving for education and R&D was conducted not only outdoors but also indoors with little external environmental impact.

Magnesium alloy is the lightest practical metal. It has excellent specific strength and recyclability as well as abundant reserves, and is expected to be a next-generation structural metal material following aluminum alloy. This paper investigated the possibility of thin plate fabrication by applying a overheating treatment to the melt drag method, and investigating the surface shape of the thin plate, grain size, grain size distribution, and Vickers hardness. When the overheating treatment was applied to magnesium alloy, the grains were refined, so it is expected that further refinement of grains can be realized if the overheating treatment is applied to the melt drag method. By applying overheating treatment, it was possible to fabricate a thin plate of magnesium alloy using the melt drag method, and a microstructure with a minimum grain size of around 12 μm was obtained. As the overheating treatment temperature increased, void defects increased on the roll surface of the thin plate, and holding time had no effect on the surface shape of the thin plate. The fabricated thin plate showed uniform grain size distribution. When the holding times were 0 and 30 min, the grain size was refined, and the effect of the holding time became smaller as the overheating treatment temperature increased. As the overheating temperature becomes higher, the grain size becomes finer, and the finer the grain size is, the higher the Vickers hardness.

Bio-based alternative leathers may be produced from biomass fiber, protein polymers, bacterial cellulose, and mushroom mycelia. Of these components, mushroom mycelia are of greatest interest. In this study, the potential of Fomes fomentariusas a mushroom mycelial mat was confirmed, and the optimal strain for the development of the mycelial mat was determined. Moreover, the quality of the mycelial mat was improved by identifying an efficient culture method to increase productivity. Mutant strains whose independence was verified were obtained by treatment with gamma irradiation under various conditions. Biofilm formation by the resulting strains was examined in sawdust and liquid media and the characteristics of the biofilms were analyzed. The biofilm of the mutant strains showed results that were similar to or better than the biofilms of longevity and cypress mushrooms. These findings are expected to be utilized in future research aimed at discovering new biomaterials using mushroom mycelia.

카메라 어레이와 사진측량(photogrammetry)을 이용한 3차원 스캐닝 기술은 인체 전신을 게임이나 시각효과 (VFX), 가상인간 등의 다양한 컴퓨터 그래픽스 응용 분야에 활용되고 있다. 특히 최근에는 메타버스 분야에 대한 구축이 활발해 지고 있는 추세여서 실제 인물에 대한 전신 스캔을 보다 저렴하게 수행할 수 있는 시 스템에 대한 요구가 증가하고 있다. 본 연구에서는 고가의 DSLR 카메라를 이용한 시스템보다 1/10정도의 가격으로 구축할 수 있는 시스템을 제작하는 사례를 제시하고자 한다. 인체 전신에 대해 동시촬영의 오차가 적은 시스템을 구축하는데 중점을 두었다. 최근의 컴퓨터 그래픽스 기술은 보다 사실적인 캐릭터를 보다 효 율적으로 생성하고 사용할 수 있는 방법으로 발전하고 있다. 따라서 본 시스템은 최근 다양한 연구와 개발 이 이루어지고 있는 메타버스의 캐릭터 구축이나 게임의 캐릭터의 모델링에 활용할 수 있는 장비로 활용될 수 있을 것으로 기대하며, 이러한 시스템을 좀 더 저비용으로 구축하고자 하는 연구자들이나 개발자들에게 도움이 될 수 있을 것으로 본다. 또한 최신의 실시간 렌더링 시스템의 추세와 삼각측량 관련 연구와 기술의 발전에도 기여할 수 있을 것으로 보인다.

This study compares the characteristics of a compact TiO2 (c-TiO2) powdery film, which is used as the electron transport layer (ETL) of perovskite solar cells, based on the manufacturing method. Additionally, its efficiency is measured by applying it to a carbon electrode solar cell. Spin-coating and spray methods are compared, and spraybased c-TiO2 exhibits superior optical properties. Furthermore, surface analysis by scanning electron microscopy (SEM) and atomic force microscopy (AFM) exhibits the excellent surface properties of spray-based TiO2. The photoelectric conversion efficiency (PCE) is 14.31% when applied to planar perovskite solar cells based on metal electrodes. Finally, carbon nanotube (CNT) film electrode-based solar cells exhibits a 76% PCE compared with that of metal electrodebased solar cells, providing the possibility of commercialization.

AZ31 magnesium alloy was used to manufacture a thin plate using a melt drag method. The effects of roll speed, molten metal temperature, and molten metal height, which are the basic factors of the melt drag method, on the surface shape, the thickness of the thin plate, Vickers hardness, and microstructure of the thin plate were investigated. It was possible to manufacture AZ31 magnesium alloy thin plate at the roll speed range of 1 to 90 m/min. The thickness of the thin plate, manufactured while changing only the roll speed, was about 1.8 to 8.8 mm. The shape of the solidified roll surface was affected by two conditions, the roll speed and the molten metal height, and the Vickers hardness of the manufactured magnesium alloy thin plate value ranged from Hv38~Hv60. The microstructure of the thin plate produced by this process was an equiaxed crystal and showed a uniform grain size distribution. The grain size was greatly affected by the contact state between the molten metal and the solidification roll, and the amount of reactive solids and liquids scraped at the same time as the thin plate. The average grain size of the thin plate fabricated in the range of these experimental conditions changed to about 50-300 μm.

Porous ceramics have the advantages of low density, low thermal conductivity, and excellent mechanical properties. Among porous ceramic manufacturing methods, the replica template method allows the easy manufacturing of porous filters with the highest porosity and pores of the desired size, but it also has the disadvantage that the resulting filters have low mechanical strength. To overcome this shortcoming, mullite (3Al2O3·2SiO2) whiskers, which have excellent thermal stability and high mechanical strength, were introduced in porous ceramic structure. The mullite whiskers were synthesized using a composition of Al2O3, flyash and MoO3. The morphologies and crystal structures of the mullite whiskers with MoO3 contents were investigated in detail. When the porous ceramic with mullite whiskers was fabricated using 20 wt% MoO3 catalyst the most uniform microstructure was obtained, and the mullite whiskers showed the highest aspect ratio of 47.03. The porosity and compressive strength of the fabricated porous ceramic were 82.12% and 0.83 MPa, respectively.