본 연구는 베트남인 유학생이 실제 대학 생활 부적응으로 인해 겪고 있는 문제점을 토대로 대학 생활 이해 향상을 위한 PBL 기반 대학 생활 문화 수업의 구체적인 절차 및 수업 방안을 제시하는 데에 목적이 있다. 이를 위해 PBL의 개념 및 절차, 교육적 효과 등 이론적 배경을 살펴보 았고 이를 토대로 PBL의 문제를 개발하였다. 개발된 문제는 한국 대학 수업 환경과 운영 방식, 한국인과의 관계 형성, 목표어 의사소통 능력 향 상 등을 목표로 설정되었고 실제 문제를 해결하는 과정에서 학습이 이루 어질 수 있도록 PBL의 수업 절차를 제시하였다. 결론적으로 본 연구는 실제 대학 생활에서 겪고 있는 학습자의 ‘문제’를 PBL의 ‘문제’로 개발하 여 수업 절차를 마련하였고 실제 교육 현장에서 활용할 수 있는 교육 방 안을 마련하였다는 점에서 의의를 들 수 있지만 실제 수업에 적용하여 외국인 학습자의 한국 대학 생활 이해 능력 향상을 측정하지 못하였다는 점에서 한계를 가지고 있다.

About 1 billion cases of vector-borne infectious diseases occur every year, of which more than 1 million is dead in worldwide. Japanese encephalitis and malaria continue to occur, and infectious diseases such as dengue fever being imported aborad have been increasing significantly due to the increasing number of overseas travelers in Korea. The Korea Disease Control and Prevention Agency has established local centers to monitor pathogen vector population density related to chimate change at 16 locations. We collected 59,389 mosquitoes in traps at 36 collection sites in 30 urban regions and migratory bird habitats in 2023. The trap index was 34.6, and the predominant mosquito species were the Culex pipiens complex, Aedes albopictus, Armigeres subalbatus, Aedes vexans, and Ochlerotatus Koreacus. The mosquitoes were pooled into 4,371 pools to monitor flavivirus infection. In flavivirus dietection, no virus was detected.

Metals are recognized as electromagnetic interference (EMI) shielding materials owing to their high electrical conductivity. However, the need for light and flexible EMI shielding materials has emerged, owing to the heavyweight and inflexible nature of metals. Carbon nanotube (CNT)/polymer composites have been studied as promising flexible EMI shielding materials because of their lightweight nature due to the low density of CNTs and their high electrical conductivity. CNTs evenly dispersed in the polymer form an electrically conductive network, and the aspect ratio of the CNTs, which are one-dimensional nanofillers, is an important factor affecting electrical conductivity. In this study, we prepared three types of multi-walled carbon nanotubes (MWNTs) with different aspect ratios and fabricated polydimethylsiloxane (PDMS)/MWNT composites. Subsequently, the electrical conductivities and electrical percolation thresholds of the three PDMS/MWNT composites with different MWNT aspect ratios were measured to analyze the behavior of electrically conducting network formation according to the aspect ratio. Furthermore, the total EMI shielding effectiveness of each composite was determined to evaluate the effect of the MWNT aspect ratio on the EMI shielding. Reflection and absorption of electromagnetic wave were measured for the PDMS/MWNT composite with the largest aspect ratio to analyze the EMI shielding mechanism of the composite. Additionally, the effects of the MWNT content on the conductivity and EMI shielding performance were examined. The results provide valuable guidance for designing polymer MWNT composites with good electrical conductivity and EMI shielding performance under different aspect ratios of MWNTs.

대파(Allium fistulosum L.)는 동양에서 옛날부터 중요한 식재료로 재배되어온 중국 원산지의 향신 채소이다. 적어도 통일신라시대부터 재배되어 온 기록이 있으며 현재에도 식재료로 수요가 많아 전국적으로 재배면적이 넓어지고 있고, 종자의 유통량 또한 많다. 대파에는 파굴파리(Liriomyza chinensis), 파좀나방(Acrolepiopsis sapporensis), 파밤나방(Spodoptera exigua) 등이 주요 해충으로 알려져 있다. 전남 진도군은 국내 대파 주산단지로 파밤나방의 발생이 많고 다이아마이드 계통 농약의 저항성이 발현되고 있어 계대사육에 따른 저항성 감소를 실험하고자 한다. 실험은 진도군의 대파밭에서 파밤나방 개체를 채집하여 실내에서 약제처리를 통해 살충률과 섭식률을 검정, 몇세대에 걸쳐 저항성이 감소되는지 알고자 한다.

The underground environment has an advantage to minimize the external influences because it is isolated space with surrounded rock medium. Therefore, underground rock has been used recently as the target for a disposal system of spent fuel with high-level radioactive. The disposal system mainly consists of natural barrier (i.e., surrounded rock medium) and engineered barrier (i.e., concrete lining, plug, backfill, canister, and buffer). In particular, the engineered barrier is important for long-term storage because it has to preferentially block the leakage of radioactive nuclide. Non-destructive technologies (NDT) have been utilized to monitor the state of disposal system for considering the limitation in deep depth conditions such as limited environment for direct damage inspection. Acoustic emission (AE) monitoring technique is an effective method to monitor the damage (crack) magnitude, history (i.e., crack evolution), and location using high-frequency elastic waves. To apply the AE monitoring method in the disposal system, the characteristics of damaged materials should be considered. The concrete lining has multi-failure behavior (i.e., brittle and ductile) resulted from composition as cement and reinforcing steel bar. Therefore, it important to investigate the AE characteristics according to the failure level of reinforced concrete for damage monitoring of the disposal systems. In this study, the four-point bending tests were carried out to measure the AE signals from the cracking of reinforce concrete specimens in laboratory. The test specimens were prepared with different strength. After the experiment, the AE characteristics were analyzed using the AE parameters with loading and failure state in the curve of time-stress. This study will be helpful for damage monitoring using AE technique in the field of high-level radioactive disposal system.

In this study, the fatigue properties of press die steel, such as SKD11, and three high-durability die steel for the cold forming of ultra-high-strength steel sheets are evaluated. Specimens for fatigue, tensile, and hardness tests are manufactured through the heat treatment recommended by steelmakers and ultra-high precision processing. The general mechanical properties and fatigue properties are derived from hardness, tensile, and fatigue tests for four die steel. The tensile and fatigue properties of die steel derived through the tests are compared and analyzed. In particular, the correlation between the fatigue limit and the general mechanical properties such as tensile strength and elongation is analyzed, which allows relational expressions to be obtained through regression analysis. Finally, the study confirms that applying high-durability die steel is necessary for improving the die life in the manufacturing of press dies for ultra-high-strength steel sheets.

Grammatical complexity constitutes an indispensable subconstruct of L2 writing ability. Nonetheless, rating scale descriptors for grammatical complexity have heavily relied on degree modifiers or adjectives. Thus, this study attempts to explore the potential for the use of nominal modifiers as discriminators for adjacent levels of L2 writers in the context of an English Placement Test. This study analyzed 374 argumentative essays written by international undergraduates. Seven nominal modifiers in the developmental stages of grammatical complexity were examined and a cumulative ordinal logistic regression model with proportional odds was fitted to explore the relative effects of those grammar features on placement decisions. Four nominal modifiers were found to be positively associated with placement decisions, after adjusting for the effects of other variables. One educational implication is for the use of nominal modifiers to be incorporated into rating scale descriptors as discriminators for L2 writers who are not advanced enough to be exempted from an English Placement Test.

Usage-based approaches to language acquisition explain language development as a gradual process of generalizing constructions through language experience. This study investigated second language learners’ development of constructional knowledge from the perspective of usage-based language development. A total of 169 Korean EFL students at five grade levels completed a sentence-sorting and a translation task. Results of the sorting task showed stronger constructional sorting as the learners’ grade level increased. Additionally, the sorting of intermediate-level learners was influenced by verb semantics such that the sentences including light verbs were more strongly clustered according to constructions than the sentences with heavy verbs, suggesting learners’ reliance on light verbs in the early stages of constructional development. Results of the translation task demonstrated a higher translation accuracy with increasing proficiency, but with a significant amount of variation across individual constructions contingent on the constructions’ syntactic and semantic complexity. Overall, our findings confirm the usage-based development of L2 learning.

Given the important status of students as major stakeholders of the National English Curriculum, this study investigated specific needs of curriculum-takers for an English curriculum and compared the results with analyses of curriculum evaluation from curriculum-completers. We implemented a needs assessment survey targeting 68 elementary school students (current curriculum-takers) and an evaluation survey targeting 27 high school students (curriculum-completers) in Korean EFL context. Results showed similarities between students’ needs and evaluation in terms of the ideal time for starting English education and time allotments. However, we found significant gaps between the two groups in several domains related to their specific goals of learning English. While the current curriculum-takers showed a high motivation to learn English for both instrumental purposes and integrative purposes, the curriculum-completers were strongly biased toward instrumental purposes. Our findings provide useful insight into curriculum development and improvement for seeking educational effectiveness in EFL settings. This study also provides helpful resources for conducting needs and evaluation analyses.

Aedes albopictus is an invasive mosquito that can be found in all continents. This species, considered as secondary vector of Dengue virus, has recently been suggested to play a role in the transmission of Zika virus in several countries bordering Brazil. In this study, We surveyed the distribution, abundance and main micro habitats of Ae. albopictus in Koera. The main bloodmeal source of this mosquito was mammals (71%) followed by birds (26%), and fish (1%). In flavivius detection, no virus was detected in this mosquito, but a total of six Japanese encephalitis virus (JEV) positive pools were detected from Culex orientalis and Culex pipiens. To investigate the possibility of using Wolbachia, as one of biological control strategy, we investigated the distribution of Wolbachia infection in Ae. albopicutus according to geographical distribution. Over 99% of the collected this mosquitoes harbored Wolbachia.