Injection molds, composed of components such as upper and lower cores, mold bases, pins, and cooling channels, serve as the primary tooling for manufacturing plastic products. Despite the often simple geometry of molded products, the configuration and design of mold components remain highly complex, making the technical expertise and accumulated know-how of mold designers essential. However, the mold industry is facing increasing difficulties due to the discontinuation of academic programs dedicated to mold design, the aging of experienced designers, and the lack of incoming skilled personnel. To address these challenges, research on automating mold design has continued, and recent advancements in artificial intelligence (AI) have accelerated efforts to internalize expert knowledge through a variety of computational approaches. In this study, we conducted foundational research aimed at constructing a DT-AX platform capable of handling multiple domains by implementing and modularizing diverse processes within a digital-twin (DT) environment and integrating AI modules specialized for each process. Given the input dimensions of a bottle-cap model (diameter and height), the simplified outer dimensions of a core mold were predicted and subsequently used to generate a 3D model. The resulting STEP file was verified to be compatible with commercial CAD and simulation software. Overall, the results demonstrate the feasibility of implementing an automated mold-design module within a digital-twin environment. Future work will focus on diversifying design variables and increasing geometric complexity to develop modules that more closely approximate real-world mold design.

In this study, quantum dots with Au/CdSe complex cores composed of Au as a metal base were synthesized, syrup was prepared, and coated on natural simulated LED unit modules, and the optical properties of traffic signs using them were investigated, and the following conclusions were obtained. The nanoparticles synthesized at 260°C and 280°C grew into irregular shapes with PL wavelengths of 624-627㎛, half-widths of 35㎛, PL-QY ratios of 55-61%, and grain diameters of 5-7㎛. The quantum dot syrup was applied to the LED unit module to produce a traffic sign composed of 4CL unit modules, and the luminance of 179 ㏅/㎡, insulation resistance of 10,000㏁, and insulation withstand of 500V were achieved, meeting the performance and specifications of the standard guidelines for luminescent traffic safety signs. The surface temperature of the unit module laminated with 4CL resin is 24~25℃, which shows a stable heat distribution, confirming that it can be applied as a sign using unit modules.

본 연구는 2022 개정 과학과 교육과정 ‘지구와 우주’ 영역의 6개 핵심 아이디어와 이해 중심 교육과정(UbD) 간의 일관성을 체계적으로 분석하여 교육과정의 이론적 기반을 강화하고 초등학교 교육과정을 중심으로 실천적 시사점을 도출 하는 데 목적이 있다. 2022 개정 교육과정은 기존의 내용 중심 교육과정에서 벗어나 핵심 아이디어 중심의 이해 중심 교 육과정으로의 패러다임 전환을 시도하고 있어, UbD 이론과의 일관성 검토가 필요한 시점이다. 연구는 문헌 분석과 내용 분석을 중심으로 한 질적 연구로 설계되었으며, 2022 개정 과학과 교육과정 문서와 UbD 관련 이론적 문헌을 분석하였다. 이해 중심 교육과정에서 제시하는 핵심 아이디어의 네 가지 준거(중심성, 전이 가능성, 영속성, 탐구 가치)를 분석틀로 활 용하였다. 연구 결과, 6개 핵심 아이디어는 UbD의 영속적 이해와 높은 수준의 개념적 일치성을 보였다. UbD의 역방향 설계 원리와의 비교 분석에서는 1단계 ‘바라는 결과 확인’은 핵심 아이디어 기반 성취기준이 명확한 학습 목표를 제시하여 높은 부합성을 보였으나, 2단계 ‘수용 가능한 증거 결정’과 3단계 ‘학습 경험과 교수 방법 계획’에서는 핵심 아이디어별 특 화된 평가 방법과 학습 경험에 대한 구체적 안내가 부족하여 제한적 부합성을 나타냈다. 개선 방안으로는 교육과정 문서 차원에서 6개 핵심 아이디어 간 연계성을 명시하는 개념 지도 제시와 핵심 질문 설정, 교수학습 실행 차원에서 직접 관찰 이 어려운 현상을 위한 시뮬레이션 자료 개발, 평가 차원에서 지구계 상호작용 설명이나 천체 관측 자료 해석 등의 수행 중심 평가 도구 개발을 제안하였다. 본 연구는 우리나라 과학교육이 국제적 수준의 교육 이론을 적절히 반영하고 있음을 확인하였으며, 성공적 실행을 위한 교사 연수, 교수학습 자료 개발, 평가 방법 개선 등 체계적 정책 지원의 필요성을 시사 한다.

Background: Core stabilization exercises are widely used to improve trunk stability, balance, and functional movement by enhancing the activation and endurance of deep trunk muscles such as the transversus abdominis (TrA). However, evidence comparing the effects of sling-based unstable surface training and mat-based stable surface training remains limited. Objects: To investigate the effects of mat based core stabilization exercises and sling based unstable surface core stabilization exercises on transversus abdominis thickness and core endurance. Methods: Forty-six healthy adults were randomly assigned to a mat exercise group (MEG, n=23) or a mat with sling exercise group (MSEG, n=23). Both groups performed 30-minute core stabilization exercises twice per week for four weeks. TrA thickness was measured using ultrasonography (SONON 300L), and core endurance was evaluated using the Bourban test for the anterior muscle chain. Results: Both groups showed significant increases in transversus abdominis thickness (MEG: P<.05; MSEG: P<.00) and core endurance (P<.00) after the intervention. However, no statistically significant differences were found between the two groups in post-intervention TrA thickness or Bourban test. Conclusion: Both mat based and sling based core stabilization exercises effectively enhanced TrA thickness and core endurance in healthy adults.

Background: Previous systematic reviews and meta-analyses have suggested core stabilization exercise as a conservative treatment approach for scoliosis. Objectives: To investigate the effects of sling exercise and unilateral core exercise on the angle, balance ability, and muscle tone in individuals with scoliosis. Design: Randomized controlled trial. Methods: Twenty-one students in their twenties with mild scoliosis were recruited as participants and randomly assigned to one of three groups: a sling exercise group (n=7), a unilateral core exercise group (n=6), and a combined sling and unilateral core exercise group (n=6). Two participants dropped out during the study. Each group performed its designated exercise program individually, three times per week for five weeks. Measurements of scoliosis angle, balance, and muscle tone were taken before and after the intervention. Results: The sling exercise intervention significantly reduced the scoliosis angle (P<.05) and significantly increased muscle tone on the convex side (P<.05). In the combined sling and unilateral core exercise group, a significant improvement in static balance ability was observed (P<.05). Conclusion: Among the core stabilization exercises applied to scoliosis, sling exercise may be considered a potential intervention for mild scoliosis.

활성슬러지 생물반응기 내 핵심 미생물군은 하수처리장에서 미생물 군집이 수행하는 생태학적 역할을 이해하는 데 중요한 기반이 된다. 본 연구에서는 이러한 핵심 미생물군의 생태학적 중요성을 규명하기 위해, 한국과 중국에 위치한 6개의 실규모 하수처리장에서 채취한 총 39개의 시료를 대상으로 고효율 염기서열 분석 기반의 미생물 군집 분석을 수행하였다. 분석 결과, 각각의 하수처리장에서 관찰된 미생물 군집 변동성은 하수처리장 간의 변동성보다 낮은 패치 동역학이 관찰되었다. 이 결과는 핵심 미생물군이 공간적 스케일보다는 시간적 스케일에서 정의될 수 있음을 보여준다. 또한, 미생물의 기능적 동역학을 비교한 결과, 하수처리장 전반에 걸쳐 통계적으로 유사한 기능적 대사경로가 관찰되었으며, 이는 활성슬러지 생물반응기 내 미생물 군집이 분류학적으로 상이하더라도 유사한 기능을 수행하고 있음을 시사한다. 종합적으로, 본 연구는 하수처리장 미생물 군집의 기능적 중복성에 대한 통찰력을 제공한다.

Background: Core stabilization exercises are a key component of exercises for the conservative treatment of adolescent idiopathic scoliosis (AIS). Objectives: To evaluate the effectiveness of two different home-based exercise instruction methods (leaflets versus video materials) for children with AIS performing core stabilization exercises. Design: A retrospective study. Methods: Pediatric outpatients diagnosed with AIS were assigned to either a leaflet group or a YouTube video group. They were instructed to perform core stabilization exercises at home daily, completing three sets per day for six months. Pre- and post-exercise (6 months) evaluations included X-rays to measure the Cobb angle and the degree of vertebral rotation. Additionally, endurance in maintaining the Superman and Bird-dog positions was assessed. Results: After 6 months of intervention, the leaflet and YouTube groups showed no significant differences regarding Cobb angle, rotational degree, or endurance in the Bird-Dog and Superman positions. However, within-group comparisons before and after the 6-month exercise period showed a significant improvement in Cobb angle in the leaflet group. If exercise leaflets are effectively utilised, they could facilitate the implementation of core stabilization exercises in children with AIS, potentially improving their prognosis. Conclusion: Providing exercise instruction via a leaflet may be more effective than using a YouTube video in facilitating adherence to core stabilization exercises and improving spinal alignment in children with AIS.

Purpose: This study aimed to examine the effects of a disaster nursing education program using the Korean Triage and Acuity Scale (KTAS) on nursing students’ competency in emergency patient triage, core competencies, confidence in disaster nursing, and self-efficacy in disaster response. Methods: This study utilized a nonequivalent control group design. The experimental group (n=25) participated in a disaster nursing education program that incorporated the KTAS, whereas the control group (n=27) did not receive any intervention. Data were analyzed using descriptive statistics and t-tests. Results: The two groups differed significantly in both competency in emergency patient triage (t=3.47, p=.001) and confidence in disaster nursing (t=2.51, p=.015). Conclusions: This study indicates that a disaster nursing education program using the KTAS, a tool currently employed in clinical practice, rather than theory-based instruction alone, contributed to enhancing nursing students’ practical competencies. Such training can improve the emergency patient triage and confidence in disaster nursing required in emergency situations, ultimately enabling future nurses to better protect the lives and health of individuals affected by disasters.

원전에서 발생 가능한 중대사고 중 하나인 용융 노심-콘크리트 상호작용(Molten Core Concrete Interaction, MCCI)은 노심의 용융물이 격납용기 하부의 콘크리트를 침투하면서 콘크리트의 물리적 및 화학적 분해를 유도하고, 이로 인해 구조적 손상이 발생하게 된다. 더불어, 분해 과정에서 발생하는 비응축성 가스와 수증기로 인해 내부압력이 급격히 상승할 수 있다. 본 연구는 MCCI 가 발생하는 상황에서 원전 프리스트레스트 콘크리트 격납용기(Prestressed Concrete Containment Vessel, PCCV)의 내부압력 저 항능력을 평가하는 것을 목적으로 한다. 이를 위해 APR1400을 대상으로 MELCOR 코드 기반의 사고 시나리오를 통해 압력 및 온도 상승을 모사하였으며, 검증된 유한요소 해석모델을 이용해 구조응답을 분석하였다. 내부압력 저항능력은 글로벌 후프 변형률(global hoop strain)과 등가소성변형률(equivalent plastic strain) 두 가지 한계상태 기준에 따라 비교 분석하였다.