콘크리트 구조물의 내ㆍ외부 보강재로 사용되는 CFRP(Carbon Fiber Reinforced Plastic) 그리드의 철근 대체 가능성을 확인하기 위해, 철도용 콘크리트 침목 내부에 CFRP 그리드를 보강한 후 유한요소 해석 프로그램인 ABAQUS를 활용하여 성능을 평가 하였다. 본 연구에서는 PC 강연선 대신 CFRP 그리드를 보강하고 하중을 재하한 결과, 피복두께 40 mm에서 최대 휨-인장 응력이 2.494 MPa로 도출되었으며 이는 KR CODE 2012의 허용응력 기준을 충족하는 값으로 나타났다. 추가적으로, 본 연구에서는 설계기준에 따라 하중 조건과 응력분포를 고려하여 중립축 위치와 CFRP 그리드의 배치를 최적화한 침목 단면설계를 진행하였다. ABAQUS 해석을 통해 침목의 휨 강도와 내구성을 평가한 결과, CFRP 그리드를 적용한 침목은 기존 PC 강연 선 보강 침목 대비 유사한 수준의 구조적 성능을 확보하면서도 경량화 측면에서 우수함을 확인하였다. 이를 통해 CFRP 그리드가 철근 을 대체하여 철도용 콘크리트 침목 설계에 적합한 보강재로 활용될 수 있음을 확인하였다.

유묘기의 저온 스트레스는 벼의 초기 생육 및 성장을 방해하여 수량 감소에 영향을 준다. 유묘기 내냉성 육종을 위해서는 내냉성을 조절하는 유전자좌를 탐색하고, 유용한 대립유전자를 도입하여 유묘기의 내냉성을 향상시킬 수 있다. 본 연구에서는 한국형 벼 핵심집단 134 계통의 유묘기 내냉성을 검정하고 전장유전체 연관 분석을 통해 해당 형질과 연관된 QTL 및 후보 유전자를 탐색하였다. 생육 10일 된 벼 유묘에 8°C의 저온을 3일 동안 처리한 후, 달관평가를 통해 1-10단계로 내냉성을 평가하였다. 1,781,068개의 SNP 마커를 이용한 전장유전체 분석을 통해 3, 5, 6, 9번 염색체에서 유묘기 내냉성 형질과 높은 연관성을 보인 4개의 QTL을 탐지하였다. 4개의 QTL 지역 중 염색체 5번에 위치한 qCTS5는 2개의 분석 모델에서 일관적으로 발견되어 높은 신뢰성을 보였다. qCTS5의 물리적 위치를 기준으로 24개의 유전자가 확인되었고, 이중 8개 유전자가 내냉성 형질과 관련 있다고 보고되었다. 추후 bi-parental population을 이용하여 유전자를 동정하고, 저온 환경에서의 역할을 명확히 밝히고자 한다.

The use of big data needs to be emphasized in policy formulation by public officials in order to improve the transparency of government policies and increase efficiency and reliability of government policies. ‘Hye-Ahn’, a government-wide big data platform was built with this goal, and the subscribers of ‘Hye-Ahn’ has grown significantly from 2,000 at the end of 2016 to 100,000 at August 2018. Additionally, the central and local governments are expanding their big data related budgets. In this study, we derived the costs and benefits of ‘Hye-Ahn’ and used them to conduct an economic feasibility analysis. As a result, even if only some quantitative benefits are considered without qualitative benefits, the net present value, the benefit/ cost, and internal rate of return turned out to be 22,662 million won, 2.3213, and 41.8%, respectively. Since this is larger than the respective comparison criteria of 0 won, 1.0, and 5.0%, it can be seen that ‘Hye-Ahn’ has had economic feasibility. As noticed earlier, the number of analysis using ‘Hye-Ahn’ is increasing, so it is expected that the benefits will increase as time passes. Finally, the socioeconomic value gained when the results of analysis using ‘Hye-Ahn’ are used in policy is expected to be significant.

This study aimed to develop an optimal greenhouse model for strawberry seedling during the summer high-temperature period based on the results of field surveys. We conducted a survey on the structure types of 46 strawberry seedling farms nationwide, including width, ridge height, eaves height, ventilation method, seedling bed width, and spacing. Based on the survey results, we derived the optimal greenhouse model by considering various factors. The greenhouse width was set at 14 meters to maximize the efficiency of seedling beds and overall space. The height was determined at 2 meters, taking into account ventilation during the summer season. To reduce stress on the supporting structure due to snow loads, we established a reinforcement installation angle of 50 degrees. We analyzed two different models that use support beams with dimensions of φ48.1×2.1t and φ59.9×3.2t, respectively, to ensure structural safety against meteorological disasters, considering regional design wind speeds and snow accumulation. We utilized these developed greenhouse model to conduct strawberry seedling experiments, resulting in a high survival rate of average 93.2%. These findings confirm the usefulness of the strawberry seedling greenhouse in improving the seedling environment and enhancing overall efficiency.

To elucidate the mechanism of pyrethroid resistance in Helicoverpa armigera, the study explored three possibilities based on deltamethrin as a model pyrethroid; 1) the existence of mutations in the target site of deltamethrin, 2) the existence of variation at the genomic level between insecticide-susceptible and resistant strains, 3) differences in gene expression patterns between the strains. Based on these hypotheses, three levels of resistant strains and a susceptible strain as well as nine Korean field populations were used. As results, 1) any point mutations were not detected in sodium channel gene. 2) based on newly set Korean reference genome (GCA_026262555.1), approximately 3,369,837 and 1,032,689 variants (SNPs and Indels) were revealed from genome and ORFs, respectively. However, any specific variants were not found to be highly correlated with the level of insecticide resistance. 3) based on DEG analysis, some of detoxification enzyme genes were differently expressed particularly cytochrome P450 genes. Therefore, H. armigera possibly acquires deltamethrin resistance through a combination of actions, including over-expression of various detoxification enzymes such as CYP3 subfamilies and cuticular proteins.

The Wide-Angle Polarimetric Camera (PolCam) is installed on the Korea’s lunar orbiter, Danuri, which launched on August 5, 2022. The mission objectives of PolCam are to construct photometric maps at a wavelength of 336 nm and polarization maps at 461 and 748 nm, with a phase angle range of 0◦–135◦ and a spatial resolution of less than 100 m. PolCam is an imager using the push-broom method and has two cameras, Cam 1 and Cam 2, with a viewing angle of 45◦ to the right and left of the spacecraft’s direction of orbit. We conducted performance tests in a laboratory setting before installing PolCam’s flight model on the spacecraft. We analyzed the CCD’s dark current, flat-field frame, spot size, and light flux. The dark current was obtained during thermal / vacuum test with various temperatures and the flat-field frame data was also obtained with an integrating sphere and tungsten light bulb. We describe the calibration method and results in this study.

This study is aimed to provide fundamental data for expanding the scope and dimensions of Sino words research, and to secure a comprehensive perspective that encompasses the ancient, modern and dialect forms of Sino words in Korean, Chinese, Japanese, and Vietnamese. In order to achieve this goal, it is necessary to construct the wide-ranging, multi-dimensional database with maximum coverage, and this study was planned to explore specific ways to realize this. East Asian languages have exchanged cultural and linguistic influences through Chinese characters for thousands of years. Therefore, the study of Sino words requires a radial and reticular approach that can closely connect their complex historical and regional layers. However, the previous researches have revealed limitations such as inadequate examination of major languages, inappropriate use of materials, or inability to analyze rich linguistic features that exist in various dialects within Chinese or differences in words between North and South Korean. To overcome these limitations, this study confirms the need for a database that can comprehensively examine Sino words in the four languages of Korean, Chinese, Japanese, and Vietnamese, without distinguishing between base and surface forms, and encompassing all morphological forms with Chinese character elements. This database should include both archaic and contemporary, or even modern new words, as well as various dialectical forms in North and South Korea and different regions of China. To be utilized effectively in research, it should also include information on usage frequency and educational vocabulary levels, enabling the confirmation of the status of a word in contemporary language. Rather than providing definitive information like a dictionary, it is more useful to provide supplementary information such as the reference and literature, increasing the accessibility of materials for researchers and increasing the possibility of implementing the database. In response to the aforementioned need, this paper proposes the construction of a relational database consisting of 12 entity tables and presents specific procedures and methods for implementing it. Despite the difficulties of constructing a relational database for vast amounts of data and the burden on servers, we expect that a wide-ranging, multi-dimensional database of East Asian Sino words will contribute to existing research on Chinese characters, as well as vocabulary and concept research and education.

In an automotive plant, an automated storage and retrieval system (ASRS) synchronizes material handling flows from a part production line to an auto-assembly line. The part production line transfers parts on small-/large-sized pallets. The products on pallets are temporarily stored on the ASRS, and the ASRS retrieves the products upon request from the auto-assembly line. Each ASRS aisle is equipped with narrow-/wide-width racks for two pallet sizes. An ASRS aisle with narrow-/wide-width racks improves both storage space utilization and crane utilization while requiring delicate ASRS aisle design, i.e., the locations of the narrow-/wide-width racks in an ASRS aisle, and proper operation policies affect the ASRS performance over demand fluctuations. We focus on operation policies involving a common storage zone using wide-width racks for two pallet sizes and a storage-retrieval job-change for a crane based on assembly-line batch size. We model a discrete-event simulation model and conduct extensive experiments to evaluate operation policies. The simulation results address the best ASRS aisle design and suggest the most effective operation policies for the aisle design.

본 논문에서는 해상 위험유해물질(Hazardous Noxious Substances, HNS) 사고의 효과적인 대응을 위해 개발된 부유식 무인이동체 기반 광역탐지 및 모니터링 시스템의 운용 시나리오 설계와 실험 검증 내용을 보인다. 광역탐지 및 모니터링 시스템은 장시간 운용이 가 능하되 제한적 이동이 가능한 무계류형 부이 형태를 갖는 부유식 무인이동체 플랫폼을 기반으로 개발되었으며 임무 수행에 필요한 열화 상 카메라, 레이더, 부유 및 대기 HNS의 탐지를 위한 센서가 탑재되었다. 실험 검증 과정에서는 탐지 센서 성능을 야외 환경에서 실험적 으로 검증하기 위해 이동식 가스 유출 시스템(Portable Gas-exposure System, PGS)을 추가로 설치하였다. 무인 시스템의 원격 및 자율 운용을 위해 전체 운용 소프트웨어는 로봇운영체제(Robot Operating System, ROS) 프레임워크를 기반으로 통합되었다. 내수면 및 실해역에서의 실 험을 통해 개발된 시스템의 운용 및 활용 가능성을 실험적으로 검증하였다.