The rapid urbanization and industrial growth have increased the demand in construction, maintenance, and infrastructure, leading to significant advancements in aerial work vehicle technology. This study focuses on the structural performance of ultra-high-strength steel plates of varying thicknesses used in telescopic booms, which is a critical component of aerial work vehicles. This study aims to address the cost issues associated with the previously used 5mm thick plates by evaluating the structural integrity of thinner plates. Using finite element analysis (FEA), the study analyzes stress and displacement for different thicknesses, specifically targeting the first boom segment, which bears the most load. The results indicate that while 3mm and 3.2mm thick plates are unsuitable due to buckling, the 4mm thick plate meets safety criteria with a safety factor of 2.51 and reduces costs by over 20%. By using 4mm thick ultra-high-strength steel for the first boom segment is cost-effective, providing structural integrity and an applicable solution for aerial work vehicle manufacturers.

Aerial work platform truck is used in various ways depending on the surrounding environment, of city roads, farming areas, and industrial sites. Air flow, drag force and torque in surroundig the flow field of AWP have been analyzed with CFD method. The overall air flow rate decreases as the AWP passes and increases between the vehicle and the boom, at the boom connections, and at the bottom of the work platform. The drag force and torque on the boom, workspace, and the combined boom and workspace are largely affected by air flow velocity. The boom's drag and torque are approximately 2.2 and 1.3 times greater than those of the work platform, respectively. These predicted results can be widely applied as basic conceptual design data for highly efficient aerial work platform truck.

Special equipment used for snow removal is only used in the winter and must be moved into storage during non-winter seasons. However, when moving heavy equipment using a forklift within a limited space, safety accidents may occur due to deformation and damage due to the worker's limited visibility and excessive loading of heavy objects. In this study, the scissors boom of the developed heavy load transporter was conducted in two cases: link structural analysis and position-based structural analysis. In detail, the link structural analysis covers four cases of stress and safety factor according to material and thickness to optimize the specifications of the material selected during development, and the structural analysis according to position covers two cases before and after the lift, when maximum stress concentration is achieved. Safety was evaluated through finite element analysis. As a result of the study, when manufacturing a scissors boom type heavy load transporter that can withstand a load of 10 tons, the link showed safety at SS400 4.5mm or higher, and reinforcement is needed in the upper and lower structures, so it is judged to be useful in applying materials according to the load.

This study was conducted to develop a precision automatic irrigation system in a nursery by considering the problems and improvements of manual and the conventional automatic irrigation system. The amount of irrigated water between the conventional automatic irrigation system and manual irrigation was 28.7 ± 4.4 g and 14.2 ± 4.3 g, respectively, and the coefficient of variation was less than 30%. However, the coefficient of variation of the conventional automatic irrigation system of 15%, was higher than that of manual irrigation of 30%. The irrigation test using the developed uniform irrigation system attached with the nozzle of a spray angle 80° and most highest uniformity was at height 600 mm. And coefficient of variation of the irrigation uniformity at the center part was within 20%, but irrigation amount of the edge part was lower 50% and over compared to the center part. As a result of a tomato grafting seedling cultivation test using the developed uniform irrigation system, the average plant height of seedling at the edge part was 28 mm but plant height at the center part was higher as 72 mm. Therefore, it was necessary to apply additional irrigation device at the edge part. The irrigation uniformity of the edge concentrated irrigation system was investigated that the irrigation amount of the edge part was irrigated by more than 50% compared with the center part, and coefficient of variation of the irrigation amount at the center part was less than 30%. As a result of a cucumber grafting seedling cultivation test using the edge concentrated irrigation system, the plant height of seedlings in the edge and central part of cultivation bed were 24% and 26%, respectively, so irrigation uniformity was higher then the uniform irrigation system. In order to improve the uniformity of seedlings, it is necessary to adjust the height of boom according to the growth of the seedling by installing a distance sensor in the overhead watering and boom irrigation system.

혐한시위, 주요 수출 품목들에 대한 수출규제, 무비자 입국제도 중단 등으로 한일 간의 갈등이 지속되고 있는 상황에서도 일본의 젊은 세대들을 중심으로 제 3차, 4차 한류 붐이 일고 있어 세대 간의 인식차가 크게 확대되고 있다. 본 연구에서는 3차 한류 붐의 중심에 서있는 방탄소년단 (BTS)이 일본의 젊은 세대들의 지지를 받으며 팬덤을 형성할 수 있었던 주요 요인과 기성세대와 젊은 세대 간의 한국, 한류에 대한 인식의 차의 배경이 무엇인지 밝히려 한다. BTS가 일본의 젊은 세대에게 큰 인기를 얻게 된 배경에는 1980년대에 만들어진 일본의 아이돌 컨셉(미숙하고 서투른 아이돌을 팬들이 응원해서 성장시킨다는 유형)이 더 이상 젊은 세대들에게 어필이 되지 않았기 때문이며, 그들은 모든 면에서 완벽한 아이돌, 언제든 자신들과 소통하며 반응해 주는 아이돌인 BTS에 열광을 하고 있었다. 한국과 한류에 대한 시각이 세대에 따라 차이를 보이는 배경에는 각 세대가 신뢰하며 시청하는 미디어가 각각 달랐다는 점에서 인식의 차가 발생하고 있었다.

Since electric energy is used in industry, mass production and various conveniences are provided. To provide convenience for the construction and operation of such electric energy transmission and distribution facilities, it is increasing that the demand for special purpose vehicles, that is, telescopic aerial work platform vehicles. When working active electric work using the telescopic aerial work platform vehicles, due to active electric work is inevitable, it is essential to ensure insulation performance for the safety of the operator. In this paper, we study the design and development of mechanical properties for filament winding process of glassfiber/epoxy composite, it is required to boom of telescopic aerial work platform vehicles. The glass fiber/epoxy composite filament winding process and its mechanical properties were evaluated to replace the existing ATOS80 boom. By filament winding process it was obtained the mechanical properties required for the design analysis of the glass fiber/epoxy composite boom. Using this, the insulated boom for the 30m class aerial work vehicle was designed and was manufactured by applying the filament winding process. The fabricated composite boom was evaluated by the static strength test to meet the required strength. The maximum displacement was 84mm and the crack occurred at the maximum load of 8981N. It satisfied the maximum lifting load of 4900N and 210mm the maximum displacement required for the boom.

Due to rapid industrialization and urbanization, maintenance of high voltage transmission lines in narrow alleys, complex roads, or old factory areas is required. Since the existing aerial lift vehicle is made of steel, there is a risk of electric shock. Therefore, there is a need for the development of an insulated aerial lift vehicle that can prevent electric shock accidents during electrical work. In particular, the development of an insulated aerial lift vehicle is required in a recent work environment where live line work is inevitable. The development of composite insulation boom for the vertical swing type aerial lift vehicle is studied. The insulated boom was developed by applying glass fiber-epoxy composite and filament winding process. The developed insulated boom was verified by measuring dielectric breakdown strength, surface resistance and volume resistance according to ASTM D149 and ASTM D257.

In this paper, the boom of a 30m class refracted insulation with outrigger on aerial elevating work platform is modeled as 3D CAD program of CATIA. The static and dynamic analyses are performed by using ANSYS and ADAMS programs, respectively. The refracted insulation boom uses acetal and the composite boom for insulation. And the composite insulation boom is modeled by using ACP (Ansys Composite Prepost) of ANSYS program. In order to analyze the durability of refracted insulation boom, the static analysis is performed and each analyzed part is stored as =MNF-type flexible body model. The dynamic analysis is performed with ADAMS by using the flexible model. As the result, these analyzes clarify the structural stability and dynamic durability (hot spot) of the refracted insulation boom.

2014년 세월호 침몰사고 이후 해상에서의 안전에 대한 국민적 관심이 높아져 왔다. 해상에서 인명구조에 필요한 초기 대응시간을 확보하기 위해 구조기관의 골든타임뿐만 아니라 조난자도 구조대원이 현장에 도착하기까지 필요한 시간을 확보할 필요가 있다. 본 연구는 유류오염방제정(이하 방제정)에 비치된 오일펜스를 활용하여 다수의 인명들을 구조할 때 조난자의 심리적 안정을 유지하고 안전하게 인명을 구조하는 방안에 대한 연구를 진행하였다. 실 해역 실험을 통해 오일펜스의 측면에 구명줄 설치 시 1 m 당 70 kg 성인 2명의 부력을 유지할 수 있고 양측면에는 4명을 유지할 수 있음을 확인하였다. 또한 오일펜스 상부에 탑승 시 8 m 당 성인 3명에 대한 부력이 유지되고 있음을 확인하였다. 구조 방법으로는 방제정에서 설치한 오일펜스 후단을 잡고 고속단정이 조난자에게 접근시키는 것이 가장 신속하고 정확하게 구조하는 방법임을 확인하였다. 이 결과로 오일펜스를 활용하여 구조기관이 구조에 필요한 시간을 확보하고 아울러 조난자가 구조 시까지 심리적 안정을 가질 수 있어 다수의 인명들을 구조할 때 구조 방안으로 활용할 수 있음을 확인하였다.

The aim of this paper is to clarify the structural stability of 30m fly(maximum working radius of 30m) and telescopic boom with composition. In order to reduce the weight and insulate, the boom of special vehicle has a 3-stage telescopic boom of DOMEX960, pocket part of acetal, 2-stage refracting boom of ATOS80, insulation boom of glass fiber composition and effector. In this process, CATIA is applied to create 3D modeling, then ANSYS are performed the structural analysis. The structural analysis is performed for a case where the thickness of the insulating boom of the ATOS 80 is 7[㎜] and the thickness of the insulating boom of the FRP material is 15[㎜] and 16[㎜].

본 연구는 초고령 사회를 목전에 둔 시점에서 신노년의 역할을 배움학적 관점에서 파악한 문헌연구이다. 한국은 2018년경부터는 고령사회로 진입하게 되고 2026년이 되면 초고령 사회로 변모하게 된다. 1955년 이후로 출생한 베이비부머가 본격적으로 노인세대로 편입되면, 우리사회는 말 그대로 노인국가가 된다. 초고령 사회의 미래 노년의 삶은 참으로 예측하기 어렵다. 앞으로 일어날 노년의 사회적 시나리오가 필요하다. 빠르게 변화하는 고령사회인 ‘시니어붐’시대를 대비하기 위해 미래의 노년 교육이 중요하다. 노년교육의 안정적인 정착과 발전을 위하여 노년을 위한 평생교육을 배움학적으로 바라보고 바람직한 노년 교육이 이루어져야 함을 인식하고, 베이비부머의 배움의 활동을 알아보고자 함을 목적으로 하였다. 기존 노년교육은 환원적이고 파편화되어 있어 유기적이고 총체적인 배움 활동을 끌어내지 못하고 있다. 배움은 조화로운 삶의 방향을 제시하는 나침반과도 같다. 배움은 자기실현의 시작이자 마무리이다. 삶의 자기실현 실천을 제시한 이론이 배움학 이론이다. 이는 한준상교수가 주장한 평생교육의 새로운 패러다임이다. “배움은 삶을 위한 밧줄이며 삶의 밧줄 꼬기 과정”으로 미래노년교육의 핵심 키워드이다. 배움학의 배움소인 생명경외, 학습탐구, 연단조리는 모든 세대가 서로 즐기고 함께 성장하는 삶의 뿌리를 제공하며 미래노년교육의 3단 통합원리를 추구한다. 배움소의 3단 통합 원리에 의해 호모 에루디티오로서 노년의 역할에 대해 고찰하였다. 첫째, 학습탐구 배움을 위해 노년은 현실을 직시하고 이에 맞는 직업교육이 이루어져야 한다. 둘째, 노년은 생명경외를 기본으로 한 세대 간의 배움을 위해서 상호작용이 이루어져야 한다. 셋째, 노년은 연단조리와 함께 하는 정신건강을 위해 영성개발을 해야 한다. 넷째, 노년은 생명경외을 기본으로 한 적극적으로 사회봉사와 사회 참여를 해야 한다. 다섯째 노년은 생명경외를 위한 노년과 모든 세대의 정책을 구축하기 위해서 활발한 정치참여를 해야 한다.

The aim of this paper is to clarify the structural stability of Refracted Telescopic Boom in 30m Class with the Property of Working Range Insulation. The boom of insulation special vehicle consists of a 3-stage telescopic boom, 2-stage refracting boom, insulation boom and effector. The catia solid geometry of the boom was used to generate both a basic ADAMS model and the finite element meshes for the flexible components. The flexible bodies were generated by using the finite element program of ANSYS and then imported into the ADAMS model and their flexibility accounted to the dynamic analysis of boom. Embedding finite element representations within the ADAMS model, offers the advantage being able to perform the durability analysis and the resulting damage. Through this approach, the crack locations(hot spots) in a prototype can be predicted successfully, thereby validating the analysis procedure.

When working on electrical wiring and cable, Electrically insulated aerial work platforms must be used to prevent the electrocution hazards. Aerial work platforms with composition boom is able to increase the weight and height of the workspace due to the lightweight of boom. The aim of this paper is to clarify structural stability of 3 stage telescopic booms having an operator platform and an upper boom of composition(Fiber Reinforced Plastic) by comparing the general telescopic booms with steel material using computational analysis.