Domestic commercial low- and intermediate-level radioactive waste storage containers are manufactured using 1.2 mm thick cold-rolled steel sheets, and the outer surface is coated with a thin layer of primer of 10~36 μm. However, the outer surface of the primer of the container may be damaged due to physical friction, such as acceleration, resonance, and vibration during transportation. As a result, exposed steel surfaces undergo accelerated corrosion, reducing the overall durability of the container. The integrity of storage containers is directly related to the safety of workers. Therefore, the development of storage containers with enhanced durability is necessary. This paper provides an analysis of mechanical properties related to the durability of WC (tungsten carbide)-based coating materials for developing low- and intermediate-level radioactive waste storage containers. Three different WC-based coating specimens with varied composition ratios were prepared using HVOF (high-velocity oxy-fuel) technique. These different specimens (namely WC-85, WC-73, and WC-66) were uniformly deposited on cold-rolled steel surfaces ensuring a constant thickness of 250 μm. In this work, the mechanical properties of the three different WCbased coaitng materials evaluated from the viewpoints of microstructure, hardness, adheision force between substrate and coating material, and wear resistance. The cross-sectional SEM-EDS (Scanning Electron Microscope-Energy Dispersive X-ray Spectroscopy) images revealed that elements W (tungsten), C (carbon), Ni (nickel), and Cr (chromium) were uniformly distributed within the each coating layers which was approximately 250 μm thick. The average hardness values of HWC-85 and HWC-73 were found to be 1,091 Hv (Vickers Hardness) and 1,083 Hv, respectively, while the HWC-66 exhibited relatively lower hardness value of 883 Hv. This indicates that a higher WC content results in increased hardness. Adhesion force between and substrates and coating materials exceeded 60 MPa for all specimens, however, there were no significant differences observed based on the tungsten carbide content. Furthermore, a taber-type abrasion tester was used for conducting abrasion resistance tests under specific conditions including an H-18 load weight at 1,000 g with rotational speed set at 60 RPM. The abrasion resistance tests were performed under ambient temperatures (RT: 23±2°C) as well as relative humidity levels (RH: 50±10%). Currently, the ongoing abrasion resistance tests will include some results in this study.

목적: 비사시성 수평 안위 이상안을 대상으로 원, 근거리 사위군에서 폭주부족을 CISS(Convergence insufficiency symptom survey) 설문지를 이용하여 측정하고 상관성을 분석하고자 하였다. 방법: 경남 김해에 거주하고 굴절이상이 구면도수 ±6.00 D 이하, 원주도수 ±2.00D 이하인 대학생 94명 (남; 36명, 여; 58명, 평균나이 22.56 ± 3.72세)을 대상으로 하였으며, 전신질환 및 안질환이 있거나, 양안의 차이가 2.00 D 이상인 굴절이상안은 제외하였다. 비사시성 수평안위이상 검사를 위해 완전융합제거사위는 마 독스 로드를 이용하였고, 일부융합제거사위는 Wesson 주시시차 카드를 이용하였으며, CISS 설문결과에 따라 폭주부족의 증상군과 비증상군으로 나누었다. 통계분석은 SPSS 22.0을 이용하였고, CISS 증상군과 비증상군의 사위도에 따른 평균 값 비교는 Mann-Whitney U test를 이용하였으며 사위의 분류에 따른 비율은 교차 분석을 이용하였으며, ROC curve는 통계프로그램 Medcalc version 17.5.5(Medcalc Software, Mariakerke, Belgium)를 사용하여 민감도, 특이도 및 AUC 값을 구하여 비교하였고 유의수준은 p<0.05로 하였다. 결과: 원거리 완전융합제거사위 검사에서 외사위군(n=62)에서는 CISS 증상군이 36명(43.4%), 비증상군 이 26명(31.3%)이며, 내사위군(n=21)에서는 증상군이 12명(14.5%), 비증상군이 9명(10.8%)으로 나타났으며, 원거리 사위 종류에 따라서 CISS 폭주부족 증상군과 비증상군의 비율은 차이가 없었다(χ2 =0.131, p=0.937). 근거리 완전융합제거사위 검사에서 외사위군(n=64)에서 증상군 37명(39.4%), 비증상군 27명(28.7%), 내사위 군(n=18)에서 증상군은 12명(12.8%), 비증상군은 6명(6.4%)으로 근거리 사위종류에 따라 증상군과 비증상 군의 비율은 차이가 없었다(χ2 =0.424, p=0.809). 일부융합제거사위 검사에서 외편위군(n=61)에서는 증상군 이 36명(38.3%), 비증상군은 25명(26.6%), 내편위군(n=10)에서 증상군은 6명(10.7%), 비증상군은 4명(10.5%) 으로 나타났으며, 편위의 종류에 따라 증상군과 비증상군의 비율은 차이가 없었다(χ2 =2.474, p=0.290). 사위검사방법의 민감도와 특이도 및 AUC는 각각 원거리 완전융합제거검사 41.3%, 75.2%, 0.542, 근거리 완전융합제거검사 69.7%, 53.1%, 0.560, 일부융합제거검사 87.2%, 특이도 2.4%, 0.541로 나타났지만 검사법에 따라 차이가 없었다. 결론: 원, 근거리 완전융합제거사위 검사로 분류한 사위의 종류에 따라 CISS 설문지로 조사한 폭주부족 증상군과 비증상군의 비율은 차이가 없었고, 일부융합제거 사위 검사로 분류한 편위의 종류에 따라서도 차이가 없었다.

목적: 본 연구는RGP 렌즈의 형상에 따라 착용 전 후 대비감도를 분석하고 안광학계에 미치는 영향을 알아보고자 하였다. 방법: 부산, 경남 소재 대학생 가운데 시력에 영향을 줄 만한 전신질환이나, 안질환등의 병력이 없고, 시력 교정 수술을 하지 않은 38명(남자 21명, 여자 17명)을 대상으로 VCTS 6500(원거리)을 이용하여 명소시(125cd/m2 )와 암소시(3cd/m2 )의 조도에서 나안시력 상태의RGP 렌즈 착용 전과 A, B, C, D 렌즈를 착용한 상태에서 각각의 대비감도를 측정하였다. 결과: 명소시에서 대비감도는 공간주파수1.5cpd에서 RGP 렌즈 착용 전과 비교하여 D 렌즈에서만 유의한 차이가 있었다(p=0.016). 3cpd(F=1.062, p=0.377), 6cpd (F=0.277, p=0.893). 12cpd(F=0.941, p=0.441). 18cpd(F=0.512, p=0.727)는 유의한 차이가 없었다. 암소시에서 대비감도는 1.5cpd(F=1.109, p=0.354)는 유의한 차이가 없었으며, 3cpd(F=1.745, p=0.142), 6cpd(F=2.666, p=0.034), 12cpd(F=5.085, p=0.001)에서는 4가지 렌즈를 착용했을 때 유의한 차이가 있었다.

The population variation of Spanish mackerel (Scomberomorus niphonius) according to its major prey abundance was analyzed using monthly catches of coastal set net fisheries in the southern waters off Gyeongsangnam-do and eastern waters off Gyeongsangbuk-do of Korea from 2006 to 2019. The abundance of Spanish mackerel and its prey species fluctuated almost simultaneously with time lags of +2 to -2 months between the set net fisheries in the southern and eastern waters. The generalized additive model revealed that the abundance of Spanish mackerel was influenced by its prey species such as hairtail and anchovy in southern waters, and common mackerel and horse mackerel in eastern waters. The model deviance explained 49% and 42% of Spanish mackerel abundance in southern and eastern waters respectively. These results suggest that the abundance of Spanish mackerel is affected by seasonal migratory prey fish species in the coastal areas and can be linked to their northerly migration.

Understanding the host defense mechanisms in response to brown leaf spot disease caused by Cochliobolus miyabeanus is very important for production of resistant plant. In this study, two-dimensional gel electrophoresis (2-DGE) in conjunction with mass spectrometry was utilized to unravel changes of stress inducible proteins in rice leaves infected with C. miyabeanus. For this purpose, we firstly observed disease developmental process of C. miyabeanus in rice using trypan blue, anilin blue, acid fuchsin staining, and DAB staining for ROS detection and expressional abundance of ROS related proteins in rice leaves inoculated was confirmed by Western blotting. Proteins were extracted by PEG fractionation and their expression patterns were analyzed by 2-DGE and subjected to image analysis using the ImageMaster 6.0 2D Platinum software, resulting in the identification of 86 differentially expressed protein spots with significantly changes (p<0.05) compared with control. MALDI-TOFTOF-MS analysis revealed that 69 proteins including 42 and 27 significantly up- and down-regulated proteins, respectively, were identified. Based on gene ontology analysis, identified proteins were classified according to their functional groups: metabolism (20%), oxygen-detoxifying (13%), protein stress/defense (24%). Thus, these results for the first time suggest that differentially induced proteins may play a key role for understanding host defense mechanisms during rice -C. miyabeanus interaction.