In response to the global interest and efforts towards reducing plastic use and promoting resource recycling, there is a growing need to establish methods for recycling discarded fishing gear. In Korea, various technologies are being developed to recycle discarded fishing gear, but significant technical and policy challenges still remain. In particular, biodegradable gill nets require a pre-treatment process to separate biodegradable materials from other substances and to remove salt before recycling. Therefore, this study aims to develop a pre-treatment device for recycling biodegradable gill nets and to evaluate the feasibility of recycling them.

The existing wire mesh clip forming process requires improvement as the production process is semi-automatic, which greatly threatens the safety of workers and exposes them to labor intensity and industrial accidents. In this research and development, we designed and developed an automated wire mesh automatic clip system by improving problems in the existing welded wire mesh production process. As a result, the production volume per hour was improved from 450 to 516, and the clip formation time was improved, shortening the production time to 42.5 seconds. Additionally, the defect rate was reduced from 7% to less than 3%.

2016년 경주지진(규모 5.8) 및 2017년 포항지진(규모 5.4)은 1978년 대한민국 지진 관측 이래 국내 에서 발생한 지진 중 가장 큰 피해가 발생한 지진으로 기록되었다. 지진의 피해사례는 다양한 분야에 서 발생되었으며, 그중 교량 구조물에도 부분적인 피해가 다수 발생하였다. 국내에서는 교량구조물에 대한 내진보강 사업을 지속적으로 진행하고 있으며, 내진 보강의 공법 중 면진받침을 적용하여 구조물 의 내진성능을 확보하는 사례는 지속적으로 증가하고 있는 추세이다. 펜들럼 교량받침은 중간판의 기 하학적인 곡률과 고강도 마찰재를 이용하여 감쇠 기능뿐 아니라 복원 기능을 구비하고 있는 면진받침 으로써 제품 크기가 작아 시공성, 경제성이 우수하여 국내에서 가장 많이 사용되고 있는 대표적인 면 진장치이다. 펜들럼 받침의 경우 지진력 감쇠 및 회전, 이동량 수용을 위하여 2면의 곡면 구조로 진자 운동을 하므로 수평 변위 발생 시 필수적으로 수직 단차가 발생하는 구조이다. 또한 면압에 따라 마찰 계수가 달라지는 마찰재의 특성을 고려한 특성치 산출이 필요한 제품이다. 이 연구에서는 펜들럼 받침 의 다양한 면압에 따른 동적 시험을 실시하여 실제 거동과 일치하는 설계 특성치 산출법을 정립하였 다. 또한 펜들럼 면진받침의 진자 운동을 반영한 모양의 가이드와 프리세팅 전, 후에도 받침 상판의 수평을 유지할 수 있는 장치를 실물 크기로 제작하여 공인기관에 의뢰하여 프리세팅 시험 및 완제품 성능 시험을 실시하여 그 성능을 검증하였다. 성능 시험 결과 곡률에 따른 프리세팅이 가능함을 확인 하였다. 또한, 곡률형 프리세팅을 적용한 펜들럼 면진받침이 구조적으로 안전함을 확인하였다.

Cars using diesel have always had problems with reducing exhaust fumes, and have been studied steadily in this regard. There were studies on the remanufacturing effect of DOC catalyst deactivated by diesel vehicle smoke reduction device, analysis of vehicle fire accident cases caused by damage to diesel vehicle smoke reduction device, and related studies on the remanufacturing effect of diesel vehicle smoke reduction device DPF. This study also developed a burner system in a smoke reduction device suitable for exhaust engines to completely burn smoke generated by institutions using diesel engines in low-temperature exhaust gases. Following the development of the existing high-performance heater, burner structure capable of maintaining ignition state in exhaust flow, pulsation generated by diesel engines, and exhaust flow control unit, the actual configuration, function and effect of the device, development contents, basic data and abnormalities of the vehicle, and comparison with other developed products.

This study investigated how to repair high-pressure pipes by applying the expansion method instead of the welding method used to repair pipes in the steel, petrochemical, and shipbuilding industries that use high-pressure pipes, and developed a pipe-specific expansion device and auxiliary equipment to use the expansion pipe. We developed an expansion device with a range of 65A to 125A, evaluated the characteristics of the equipment, and manufactured high-pressure pipes made with this device, and obtained the following conclusions. The pressure resistance performance test of the non-welded expansion device was carried out at 32A to 125A, and the pipe pressure resistance test showed good results, and the durability test confirmed the durability of 0.0061 to 0.0063mm. The vibration test of the developed expansion device was measured at 0.3~0.5mm/s, and the noise measurement result was 65.1~65.5 at 32A, 65.2~65.5 at 65A, and 65.4~66.6dB at 125A.

Cars using diesel have always had problems with reducing exhaust fumes, and have been studied steadily in this regard. There were studies on the remanufacturing effect of DOC catalyst deactivated by diesel vehicle smoke reduction device, analysis of vehicle fire accident cases caused by damage to diesel vehicle smoke reduction device, and related studies on the remanufacturing effect of diesel vehicle smoke reduction device DPF. This study is also to develop an exhaust flow control unit suitable for an exhaust engine to completely burn smoke generated by an engine using a diesel engine in a low temperature exhaust gas. The main systems to be developed are high-performance heaters, burner structures that can maintain ignition in exhaust flows, and exhaust flow control units that reduce exhaust gas backflow effects caused by diesel engines.

ars using diesel have always had problems with reducing exhaust fumes, and have been studied steadily in this regard. There were studies on the remanufacturing effect of DOC catalyst deactivated by diesel vehicle smoke reduction device, analysis of vehicle fire accident cases caused by damage to diesel vehicle smoke reduction device, and related studies on the remanufacturing effect of diesel vehicle smoke reduction device DPF. This study also developed an optimized system for complete combustion of smoke generated by institutions using diesel engines in low-temperature exhaust gases. The main systems to be developed are high-performance heaters, burner structures that can maintain ignition in exhaust flows, and exhaust flow control units that reduce exhaust gas backflow effects caused by diesel engines.

Cars using diesel have always had problems with reducing exhaust fumes, and have been studied steadily in this regard. There were studies on the remanufacturing effect of DOC catalyst deactivated by diesel vehicle smoke reduction device, analysis of vehicle fire accident cases caused by damage to diesel vehicle smoke reduction device, and related studies on the remanufacturing effect of diesel vehicle smoke reduction device DPF. This study also developed a burner system in a smoke reduction device suitable for exhaust engines to completely burn smoke generated by institutions using diesel engines in low-temperature exhaust gases. The main systems to be developed are high-performance heaters, burner structures that can maintain ignition in exhaust flows, and exhaust flow control units that reduce exhaust gas backflow effects caused by diesel engines.

Cars using diesel have always had problems with reducing exhaust fumes, and have been studied steadily in this regard. There were studies on the remanufacturing effect of DOC catalyst deactivated by diesel vehicle smoke reduction device, analysis of vehicle fire accident cases caused by damage to diesel vehicle smoke reduction device, and related studies on the remanufacturing effect of diesel vehicle smoke reduction device DPF. This study is also to develop a burner structure in a smoke reduction device suitable for an exhaust engine to completely burn smoke generated by an engine using a diesel engine in a low-temperature exhaust gas. The main systems to be developed are high-performance heaters, burner structures that can maintain ignition in exhaust flows, and exhaust flow control units that reduce exhaust gas backflow effects caused by diesel engines.

A universal joint is a device that transmits the power of a combat vehicle engine to a cooling fan. The power of the engine is transmitted to the universal joint as it is without buffering, and play occurs at the joint between the drive shaft connected to the engine and the driven shaft connected to the cooling fan according to the usage time. Accordingly, the universal joint is periodically replaced, and the criterion for this is the degree of torsion of the universal joint. However, if the universal joint is not properly maintained during the replacement cycle, damage to the universal joint as well as damage to the surrounding power supply may occur. Accordingly, a backlash measuring device was developed to determine the limit of durability of the universal joint, and the limit of durability was derived through regression analysis of the backlash value according to the use time obtained from the accelerated life test.

In wastewater treatment, an emulsion polymer automatic dissolving system is used to mix and dissolve the polymer used as a polymer coagulant with water before it is put into the dissolution tank. In this study, a disperser is developed to mix water and emulsion polymer better in the dissolving system. For this purpose, the flow analysis of the three disperser models was performed to select the disperser for the emulsion polymer automatic dissolving system with the best performance. The excellence of mixing was evaluated by grasping the flow uniformity and the vorticit in the disperser, and it was confirmed that the TYPE3 disperser was excellent.

The fuel oil used for ships has the viscosity higher than the fuel used for general vehicles and contain impurities, so it’s exhaust gas results in the environment pollution. There have been studies actively conducted to examine alternative fuels for improving the quality of the marine fuel oil. It is, however, necessary to test the quality of fuel for mega ships, by conducting the simulation test using reduced-size models, before the demonstration step, because it takes too much cost and time to directly perform the demonstration of alternative fuels. This study, therefore, developed a 30-liter small-size boiler similar to the ship system and performed an initial fuel test by applying MGO to it. The findings show that the amount of nitrogen oxide to which 4% of the standard oxide level was applied was about 24.69ppm, when the oxide level was 10.02%, with the CO2 of 8.02%, the exhaust gas temperature of 291.15℃ and the combustion efficiency of about 74.53%, indicating that it will be necessary to conduct various studies through the ratio control in the future.