본 시험은 재배과정 중 배지에서 분리한 미생물의 특성을 조사하여 이들 미생물과 버섯균의 생육과 연관관계를 밝히고자 하였다. 짚, 계분 등 배지 재료에서 분리한 미생 물의 양송이 균주에 대한 억제 정도는 국내 육성 양송이 균주가 외국에서 수입한 양송이 균주 보다 생육 억제 정도가 낮은 경향을 보였다. 양송이 배지 발효 단계별 분리 미생물의 양송이 품종간 균사 생육 억제 정도는 국내 육성 품종인 새도가 다른 품종보다는 생육이 좋았다. 그리고 발효과정이 진행됨에 따라 버섯균에 대한 억제 정도는 약해지는 경향을 보였다. 양송이 배지에서 분리한 미생물을 합성배지(CDA)에 도말한 뒤 버섯균사를 접종하여 균사의 생육을 조사한 결과와 분리균을 도말하고 항온기에서 2일간 배양한 후 배지를 완전히 뒤집어 배지의 뒷면 중앙에 버섯 균사를 접종하여 균사 생육을 조사한 결과를 비교 분석한 결과 양송이균의 생육 정도가 비슷한 경향을 보이는 것으로 보아 양송이 배지에서 분리한 미생물은 분비성 물질을 통해서 버섯균의 생육과 증식에 영향을 미친다는 것을 알 수 있었다. 양송이 균의 생육을 촉진하는 미생물을 분리한 결과 21균주가 선발되었고 대부분 4차 뒤집기 이후에서 많이 선발되었다. 대표적인 균주로는 Alcaligenes faecalis B-4-28, Comamonas testosteroni B- 4-31, Acinetobacter soli B-4-40 등이 있다.

In this paper, nonlinear finite element analysis was conducted based on the experimental results on buckling restrained brace. The reliability of the analytical model was verified by comparing the results of experimental studies with hysteresis loop, bi-linear curve, cumulative energy dissipation capacity, and equivalent viscous damping. A valid finite element model has been secured and will be used as basic data for finite element analysis of buckling restrained braces in the future.

본 연구는 4차 산업혁명과 팬데믹의 환경 속에서 중소·중견기업 리더의 온라인 코칭행동이 조직성과에 미치는 영향과 그 과정에서 구성원의 직무만족과 정 서적 조직몰입의 매개 여부, 그리고 사업환경 불확실성이 이들 간의 관계를 조절하는지 검증하고자 하였다. 이를 위해 국내 다양한 업종에 속한 중소․중견기업의 구성원 중 온라인 업무 경험이 있는 350명의 자료를 수집하였고, SPSS 23.0, AMOS23.0 과 Process macro 3.5를 사용하여 실증분석을 하였다. 분석 결과는 다음과 같다. 첫째, 온라인 코칭행동은 구성원의 직무만족, 정서적 조직몰입과 조직성과에 정(+)의 영향을 미쳤다. 둘째, 온라인 코칭행동과 조직성과 간에 직무만족과 정서적 조직몰입의 매개 효과를 확인하였다. 셋째, 사업환경 불확실성은 온라인 코칭행동과 조직성과 간의 관계를 조절하는 것으로 나타났으나, 온라인 코칭행동과 직무만족 및 정서적 조직몰입과의 관계는 조절하지 않는 것으로 나타났다. 이러한 분석결과를 통해 온라인코칭행동도 대면코칭행동과 마찬가지로 조직성과에 영향을 미친다는 것을 알 수 있었으며, 따라서 현재와 같이 사업환경이 매우 불확실한 상황에서 중소·중견기업들은 온라인 코칭을 활용하고 직무만족 및 정서적 조직몰입을 증진시킴으로서 성과를 향상시킬 수 있을 것으로 생각된다.

Purpose: This study aims to identify the degree of intention to hand hygiene and hand hygiene behavior in new nurses based on education experience on infection control. Method: The participants comprised 108 new nurses working in a general hospital in S city, Korea. Data were collected from September to December, 2020. Data were analyzed using descriptive statistics, independent t-test, analysis of variance (ANOVA), and Pearson correlation with SPSS 26.0 program. Results: There were statistically significant differences in intention to hand hygiene (F=3.39, p=.021) and hand hygiene behavior (F=3.33, p=.022) depending on education experience related to infection control during undergraduate courses. Hand hygiene intention (F=4.41, p=.008) and hand hygiene behavior (F=4.13, p=.008) showed statistically significant differences depending on educational satisfaction with infection control during undergraduate courses. There were significant positive correlations between intention to hand hygiene and hand hygiene behavior (r=.21, p=.026). Conclusion: This suggests that education in infection control can reinforce intention to hand hygiene and hand hygiene behavior in new nurses.

P91 steel has been a highly researched material because of its applicability for high-temperature applications. Considerable efforts have been made to produce experimental creep data and develop models for creep life prediction. As creep tests are expensive and difficult to conduct, it is vital to develop authenticated empirical methods from experimental results that can be utilized for better understanding of creep behavior and can be incorporated into computational models for reliable prediction of creep life. In this research, a series of creep rupture tests are performed on the P91 specimens within a stress range of 155 MPa to 200 MPa and temperature range of 640 oC (913 K) to 675 oC (948 K). The microstructure, hardness, and fracture surfaces of the specimens are investigated. To analyze the results of the creep rupture tests at a macro level, a parameter called creep work density is derived. Then, the relationships between various creep parameters such as strain, strain rate, time to rupture, creep damage tolerance factor, and creep work density are investigated, and various empirical equations are obtained.

A shear wall is a structural member designed to effectively resist in-plane lateral forces, such as strong winds and earthquakes. Due to its efficiency and stability, shear walls are often installed in residential buildings and essential facilities such as nuclear power plants. In this research, to predict the results of the shaking table test of the three-story shear wall RC structure hosted by the Korea Atomic Energy Research Institute, three types of numerical modeling techniques are proposed: Preliminary, Calibrated 1, and Calibrated 2 models, in order of improvement. For the proposed models, an earthquake of the 2016 Gyeongju, South Korea (peak ground acceleration of 0.28 g) and its amplified earthquake (peak ground acceleration of 0.50 g) are input. The response spectra of the measuring points are obtained by numerical analysis. Good agreement is observed in the comparisons between the experiment results and the simulation conducted on the finally adopted numerical model, Calibrated 2. In the process of improving the model, this paper investigates the influences of the mode shape, material properties, and boundary conditions on the structure's seismic behavior.

Rare earth magnets with excellent magnetic properties are indispensable in the electric device, wind turbine, and e-mobility industries. The demand for the development of eco-friendly recycling techniques has increased to realize sustainable green technology, and the supply of rare earth resources, which are critical for the production of permanent magnets, are limited. Liquid metal extraction (LME), which is a type of pyrometallurgical recycling, is known to selectively extract the metal forms of rare earth elements. Although several studies have been carried out on the formation of intermetallic compounds and oxides, the effect of oxide formation on the extraction efficiency in the LME process remains unknown. In this study, microstructural and phase analyses are conducted to confirm the oxidation behavior of magnets pulverized by a jaw crusher. The LME process is performed with pulverized scrap, and extraction percentages are calculated to confirm the effect of the oxide phases on the extraction of Dy during the reaction. During the LME p rocess, Nd i s completely e xtracted a fter 6 h, w hile D y remains as D y2Fe17 and Dy-oxide. Because the decomposition rate of Dy2Fe17 is faster than the reduction rate of Dy-oxide, the importance of controlling Dy-oxide on Dy extraction is confirmed.

The purpose of this study was to investigate the sustainable practices of nutrition science teachers and dietitians working in school food service operations, and identify the social and psychological factors which affect the overall efficacy of the system. The research model was constructed based on the Extended Theory of Planned Behavior (ETPB) in order to analyze how individual motivation affects the sustainable practices of nutrition science teachers and dietitians. The data were collected through e-mail and postal mail from nutrition science teachers and dietitians all across Korea, and self-administered surveys were conducted. SPSS and AMOS programs were used for statistical analysis. First, the sustainable practices of nutrition science teachers and dietitians were analyzed in 6 different categories. Second, the significant pathways were 6 out of 9 in the ETPB model. Sustainable food service practices in school can contribute to the formation of more a sustainable culture, such as through the encouragement of more healthy eating habits, and higher level of environmental awareness and community awareness. The factors influencing these practices can be applied to the design of improvement programs aimed at increasing sustainable practices.

Electronic textiles promise to provide an intelligent platform to enlarge the scope of wearable electronic applications. Therefore, the combination of flexible energy storage devies into wearable systems is a key for operating these electronic textiles during bending, knotting, and rolling. Nonetheless, the application of fibrous supercapacitors consisting of a gel-electrolyte and carbon fiber electrode is still obstructed by low capacitance, low rate-performance, and poor cycling stability owing to the inefficient interface between the gel-electrolyte and electrode. Here, a fibrous supercapacitor is obtained using an optimized gelelectrolyte that improves the ionic diffusion capability. The optimized fibrous supercapacitor shows a superior electrochemical performance, including high specific capacitance of 41 mF cm−2 at current density of 2.0 μA cm−2, high-rate performance with 17 mF cm−2 at a current density of 15.0 μA cm−2, and outstanding cycling stability (88% after 3,000 cycles at a current density of 200.0 μA cm−2). The excellent energy storage performance is mainly attributed to the optimzied interface between the gelelectrolyte and electrode material, leading to an improved ionic diffusion capability.

본 연구의 목적은 코칭리더십이 혁신행동과 이직의도에 미치는 영향을 분석 하고 아울러 이들 사이에 리더의 감성지능이 조절역할을 하는 가를 검증하는데 있다. 이러한 연구문제를 검증하기 위해 본 연구의 조사대상은 ICT연구개발분 야의 조직에서 근무하는 직장인들을 대상으로 사전에 80명의 파일럿을 통하여 측정도구의 신뢰도 분석을 실시하고 총 310부의 설문지를 배부하여 유효한 285부를 SPSS 22.0 프로그램과 AMOS를 이용하여 분석에 사용했는데, 분석 결과는 다음과 같다. 첫째, 코칭리더십이 ICT 연구개발직에서 혁신행동에 유의한 정(+)의 영향을 미치는 것으로 나타나 코칭리더십이 조직 구성원들의 혁신행동에 긍정적인 영향을 미친다고 볼 수 있다. 둘째, 코칭리더십은 조직 구성원들의 이직의도와 유의한 부(-)의 영향을 미치는 것으로 나타나 리더의 코칭행동이 구성원들의 이직 의도에 영향을 미치는 것으로 나타났다. 셋째, 코칭리더십은 혁신행동 및 이직 의도간의 관계에서 리더의 감성지능이 조절역할을 하는 것으로 나타나 리더의 감성지능이 영향력이 있음을 증명하였다. 이러한 연구결과를 토대로 본 연구의 이론적, 실무적 시사점과 향후 연구에 대한 방향을 제시하였다.

In this study, the high-temperature oxidation properties of austenitic 316L stainless steel manufactured by laser powder bed fusion (LPBF) is investigated and compared with conventional 316L manufactured by hot rolling (HR). The initial microstructure of LPBF-SS316L exhibits a molten pool ~100 μm in size and grains grown along the building direction. Isotropic grains (~35 μm) are detected in the HR-SS316L. In high-temperature oxidation tests performed at 700oC and 900oC, LPBF-SS316L demonstrates slightly superior high-temperature oxidation resistance compared to HR-SS316L. After the initial oxidation at 700oC, shown as an increase in weight, almost no further oxidation is observed for both materials. At 900oC, the oxidation weight displays a parabolic trend and both materials exhibit similar behavior. However, at 1100oC, LPBF-SS316L oxidizes in a parabolic manner, but HR-SS316L shows a breakaway oxidation behavior. The oxide layers of LPBF-SS316L and HR-SS316L are mainly composed of Cr2O3, Febased oxides, and spinel phases. In LPBF-SS316L, a uniform Cr depletion region is observed, whereas a Cr depletion region appears at the grain boundary in HR-SS316L. It is evident from the results that the microstructure and the hightemperature oxidation characteristics and behavior are related.