철근 콘크리트의 부식으로 인해 비부식성 대체재의 채택이 촉진되었으며, GFRP 철근은 가장 널리 채택된 경제적이고 균형 잡힌 성능 옵션 중 하나이다. GFRP 철근의 탄성 계수는 강철보다 낮아 완전한 대체가 어렵다. 하지만 최근 GFRP의 탄성 계수는 국제 기준 30∼40 GPa에서 약 60 GPa(국외 생산 기준), 50 GPa(국내 생산 기준)로 증가했습니다. 그러나 대부분의 설계 방정식은 기존의 저탄성계수 GFRP를 기준으로 보정되었다. 본 연구에서는 고탄성계수 GFRP 보강근으로 보강된 두 개의 콘크리트 보의 휨 거동을 분석하며, 실험 하중-변위 응답을 Adam, ACI 440.1R-06, CSA S806-12 및 최신 ACI 440.11-22의 예측값과 비교한다. 이 모델들은 모두 비균열 영역의 초기 경사와 일치하지만, 저탄성계수 GFRP를 사용한 보정으로 인해 실제 강성을 과소평가하고 처짐 을 과대 예측하는 경향이 있습니다. 균열 발생 후 편차가 증가하며, 이때, Adam 방정식이 가장 큰 편차를 보인다. 이는 기존 모델의 한계를 보여주며, 변위 제어가 매우 중요한 경우 기존 모델의 사용에 신중해야 함을 보여준다.

Jeans, emblematic of enduring fashion appeal, serve as a barometer of societal trends. This study explores the evolving landscape of meta trend analysis in the fashion industry, acknowledging the need for methodologies tailored to the vast amounts of data available through social media. By focusing on jeans, a quintessential fashion staple, the research applies text mining techniques, specifically TF-IDF analysis, to examine design style changes over a decade. Methodologically rigorous, the study meticulously curates and analyzes Naver blog posts spanning from 2013 to 2022, filtering out content unrelated to design. Morpheme analysis isolates pertinent nouns, facilitating comprehensive TF-IDF examinations. Design elements—fit, color, material, detail, and rise length—are methodically dissected, revealing notable shifts over time. The skinny fit, once dominant, diminished in prevalence by 2022, contrasting with the ascendant popularity of the wide fit. Noteworthy trends emerge in color preferences, with black and white prevailing alongside a burgeoning interest in light blue. Elasticity appears as a key material characteristic that remains consistent throughout the study period. Moreover, temporal fluctuations in detailing, such as tears and decorative stitching, underscore the dynamic nature of fashion. This research makes a unique contribution to the literature on the intersection of fashion and big data, emphasizing design perspectives amid the prevalence of consumer-focused analyses. Its practical implications extend to informing online fashion product development and prioritizing design elements that resonate with contemporary consumer preferences.

In this paper, the structural optimization and experimental validation of lightweight, high stiffness rollers for roll-to-roll(R2R) processing of lithium metal electrodes are presented. Precise dimensional control of electrode thickness below 50㎛ is essential for next-generation high energy density batteries, yet elastic recovery during rolling hinders the achievement of target specifications. To address this challenge, finite element(FE) analysis was employed to determine the optimal rolling gap and roller geometry, and the results were verified through R2R experiments. Simulations indicated that a rolling gap of 153㎛ yielded a final sheet thickness of about 49.6㎛, meeting the design requirement. Experimental results confirmed the validity of the numerical model, with thickness measurements deviating less than ±10% from FE analysis predictions. These findings demonstrate that the proposed roller design not only ensures thickness precision but also improves system efficiency, offering practical guidelines for scalable lithium metal electrode manufacturing.

본 연구는 네트워크 분석 기법을 적용하여 색상(Color), 소재(Material), 가공기술(Technique) 간 조합을 체계적으 로 탐색하고 분석하는 것을 목적으로 한다. 한국디자인진흥원의 CMF HOW’S 아카이브 데이터를 기반으로 C–M–T 통합 네트워크를 구축하고, 이분 네트워크 분할과 투영(Projection) 분석을 통해 구조적 특성과 조합 양상을 정량적으 로 도출하였다. 중심성, 밀도, 군집 계수, 모듈러리티 지표를 활용한 결과, 색상은 다양한 소재⋅기술과 폭넓게 결합 되는 유연성을 보였고, 소재는 가공기술 선택을 제약하거나 반복적 조합을 형성하는 핵심 요소로 확인되었다. 일부 소재는 높은 중심성을 보여 다수의 색상⋅기술과 연결된 반면, 다른 소재는 제한적 적용성을 나타냈다. 또한 모듈러 리티 분석을 통해 유사한 가공 전략을 공유하는 조합군이 식별되어, 제품군별 설계 전략이나 공정 최적화로 확장될 수 있음을 시사한다. 전문가 인터뷰에서는 본 분석틀이 CMF 기획 및 실무 의사결정에서 활용 가능한 참조 지표로 평가되었으며, 향후 친환경 규제 대응, 산업군 비교, 제품군 사례 분석 등으로 확장 가능성이 제시되었다. 본 연구는 CMF 데이터를 구조 화하여 조합 경향을 객관적으로 이해하고, 디자인 실무에 적용 가능한 분석 도구를 제시한다는 점에서 학술적⋅실무 적 의의를 갖는다.

In this study, structural analysis was performed to select the optimal design shape through failure identification and design changes in turbine housing. Damage in the inlet flange is considered to be high cycle fatigue due to the vibration excitation in the engine full load test. Therefore, the FE analyses were performed natural vibration analysis and frequency response analysis for the initial shape and design change models. The stress magnitudes were obtained as a function of frequency through frequency response analysis according to engine vibration excitation. As a result, the dynamic stiffness of Case (1) increased by approximately 3.6% compared to the initial model, and Case (2) increased by 4.6%. In addition, the stress magnitude was greatly reduced in the design improvement. Therefore, the model with only the flange thickness increased is thought to be optimal design for securing the durability of the turbine housing.

The purpose of this study is to investigate the dynamic behavior of the internal cabinet of a nuclear power plant due to an earthquake and the characteristics of cabinet vibration reduction by TMD(tuned mass damper). For this purpose, the experimental device was constructed and numerical analysis was performed. The experimental device for the dynamic behavior of the cabinet consists of a cabinet, sliding base, mount, actuator, exciter, and measuring system, and the frequency response function of the cabinet was obtained. In addition, the time history of the cabinet was analyzed for acceleration and displacement through TMD design and cabinet 3D modeling. The natural frequency and response of the cabinet were lowered by approximately 26% due to the structural rigidity of the cabinet under the conditions of door opening and sliding base strong excitation. The acceleration and displacement characteristics of the cabinet varied depending on the TMD mass, and the cabinet vibration reduction effect was the best when the TMD mass was 60kg. The reduction in acceleration and displacement of the cabinet was approximately 12.1–16.2% and 10.1–19.1%, respectively.

In apartment buildings in Korea, irregular walls, such as T-, L-, and U-shaped walls, are commonly used. However, in practical design, the geometric irregularities of walls are often neglected when determining the length of the lateral confinement region. Further, although earthquake loads apply from various directions, the lateral confinement region is typically determined for the in-plane direction of the web. Thus, using finite element analysis, this study investigated the structural performance of irregular walls subjected to various loading directions. As the design parameters, wall shape, cross-sectional aspect ratio, and loading direction were addressed. According to the parametric analysis results, as the length of flange in tension increased, the lateral confinement region should be evaluated with consideration of the geometric irregularity. Further, for the L- and U-shaped walls, it is recommended to evaluate the lateral confinement region for various loading directions. Based on these results, a design method to determine the lateral confinement region of irregular walls was suggested.

선박용 프로펠러는 선박 추진 성능과 연비에 직접적인 영향을 미치는 핵심 부품으로, 제작 과정에서 높은 정밀도가 요구된다. 사형주조는 복잡한 형상의 금속 부품 제작에 널리 사용되는 공정이지만, 주조 과정에서 발생하는 열적 팽창과 냉각 수축은 최종 치수 오 차와 가공 비용 증가를 초래하는 주요 원인이다. 본 연구에서는 사형주조 과정에서 발생하는 열팽창 및 수축 현상을 정밀하게 예측하고, 이를 고려한 최적의 치수 여유 설정을 통해 연마 작업을 최소화하는 설계 방안을 제안하였다. 알루미늄 청동 합금(ALBC3)을 사용한 프로 펠러를 대상으로 열팽창 공식과 유한요소해석(FEM)을 적용하여 블레이드, 허브, 전체 지름 등 각 부위별 변형을 정량적으로 분석하였다. 분석 결과, 블레이드 너비와 두께는 약 1.9%, 허브 직경은 1.5%, 전체 지름은 2.0%의 여유를 두는 것이 적절한 것으로 나타났다. 이러한 최 적 치수 여유를 적용한 결과, 최대 23kg의 재료 절감, 30만 원 이상의 제작 비용 절감, 작업 시간 50~60% 단축 등의 정량적 개선 효과가 확인되었다. 최적 설계를 적용함으로써 추가 연마 작업과 재료 손실을 줄일 수 있으며, 이에 따른 비용 절감 효과도 기대된다. 본 연구 결 과는 선박용 프로펠러 제작 과정의 품질 향상과 생산성 제고에 기여할 수 있을 것으로 판단된다.

Since the small screen must be watched at the production and manufacturing site, when using the monitor without a separate paper for work and production instructions, it is necessary to look at the work instruction screen installed in a separate space to prevent work efficiency from deteriorating. It plays a role through a monitoring system using DPS or Barcode and RF-ID recognition as a safety device for installing heterogeneous parts in manufacturing and missing parts, but due to the high cost of introducing the system and difficulty in maintaining management, Visual POP is put into the production line. This study was produced by paying attention to the following five points in order to reduce the weight of these industrial Visual POPs and have global specifications and uses. These include instrument design and design, processing production, UI and control, application, thermal stress analysis and thermal analysis. In this study, it is considered to thermal stress analysis and thermal analysis of Visual POP for Models 1 and 2.

In this study, the design of shock tower mounting, a type of shock absorber mounting for four-wheel drive vehicles, was addressed through structural analysis. In the case of existing shock tower mounting components, cracks occurred in the shock tower frame side weld joints, so the maximum stress should be reduced to extend the life of the designed components. Based on this, various design changes were performed on the shock tower mounting components, and the maximum stress generated through structural analysis of each design change model was compared. For the structural analysis, a load of 40,000 N was applied in the axial direction of the shock absorber, and the results were relatively analyzed and compared. As a result of the analysis of the shock tower mounting components through the design change, Case 3, a model that alleviated the stress concentration applied to the body mounting, increased the strength compared to the existing model, and the stress in the shock tower frame side weld joints was reduced by 16.3%.

A bolt-fastening method was invented for connecting prefabricated modular structures with a purpose of reducing production cost and enhancing delivery efficiency of precast structures by eliminating welding parts. In order to remove welded connections, a drawing part and a bending part were designed and bolted together to easily generate a long support structure. The bolt-fastened structure had a plate deflection of similar magnitude to that of the welded structure, and weighed about 2.5% less. The heat supplied inside the structure for concrete curing had a negligible effect on the deflection of the structure. Since the unit module is only 640 mm long, and welding is eliminated from production to export local assembly, and the long structure is completed only by fastening, significant reductions in shipping cost and local labor cost are expected.

The purpose of this study is to examine the application and effectiveness of tuned mass dampers for reducing cabinet vibration in plants. Cabinet with lower structural rigidity than plant subject to seismic design standards is susceptible to resonance. SolidWorks was used for 3D modeling of the cabinet, and ANSYS Workbench was used to create a mesh. The vibration characteristics of the cabinet were investigated through modal analysis, and the possibility of resonance and vibration reduction performance of the cabinet were evaluated. The number of modes in the cabinet was set to 100, and the frequency and modal participation mass ratio of each mode were calculated. In order to examine the possibility of vibration reduction by tuned mass dampers, the vibration response characteristics of cabinets with and without tuned mass dampers were compared. The analysis results showed that the third mode had a significant effect on the dynamic behavior of the cabinet and that the modal participation effective mass ratio was larger than that of other vibration modes. And as the mass of the tuned mass damper increased, the vibration response of the cabinet decreased significantly, and the peak value of the cabinet decreased by up to 52%.

The seriousness of environmental pollution and Particulate matter is becoming a hot topic around the world, and interest in air pollution problems caused by exhaust gases generated from industrial sites, automobiles, and ships is also increasing. Korea's air environment has a significant external impact due to its regional characteristics, so there is a limit to establishing an air environment management plan according to regional emission characteristics. In order to reduce Particulate matter emissions, various industrial fields use technology to remove air pollutants by using an electric precipitator to reduce fine pollutants. In this study, we intend to optimally design the dust collecting plate and electrode plate of the low-pressure electric precipitator to confirm the changes in physical properties and properties of SUS316L materials before and after exposure to diesel engine exhaust gas.