본 연구는 최고경영자의 은퇴시기가 기업의 국제화 정도에 미치는 영향을 탐구한다. 구체적으로 은퇴 시기가 비교적 길게 남은 CEO의 경우 위험 감수 성향이 높기 때문에 해외 사업에 집중 혹은 확장하려는 경향을 보일 것이라는 가설을 제시한다. 반면, 은퇴 시기가 비교적 짧게 남은 CEO는 위험 감수성이 낮지만, 높은 오너십을 소유하고 있을 때 위험이 따르는 해외 시장 진출과 확장을 추구하는 경향을 보일 것이라는 가설을 예측한다. 다양한 산업 군에 있는 미국 기업들을 대상으로 위 가설들을 검증한 결과, 비교적 은퇴 시기가 길게 남은 CEO들이 국제화에 보다 적극적으로 참 여할 것이라는 주장이 지지되었다. 하지만 CEO의 은퇴시기와 더불어 오너십의 긍정적인 영향을 줄 것이라는 조절효과 가설은 지지되지 않았으며 오히려 높은 오너십의 경우 은퇴시기가 가까운 CEO는 국제화에 소극적인 결과를 확인하였다. 이러한 실증 분석 결과는 최고경영자 관점에서 기 업의 국제화 의사 결정 과정을 이해하는데 의미 있는 학문적, 실무적 시사점을 제공한다.

The government has recently introduced the human rights management system of public institutions in accordance with the OECD guidelines for multinational corporations and the UN guidelines for business and human rights implementation. For this reason, public institutions receive a human rights impact assessment to be reflected in the institutional management evaluation based on the human rights management manual of public institutions issued by the National Human Rights Commission of Korea. Human rights impact assessment is an institution’s management activities that identify and evaluate actual and potential human rights risks in advance and is divided into institutional and business operations. The institutional operation evaluation is conducted in 10 areas, including human rights management system, employment, labor rights, industrial safety, supply chain, and local residents’ protection, and the project operation evaluation is conducted by itself or by a specialized institution by selecting main projects and fields that can affect human rights of stakeholders. This study compares and analyzes the results of the human rights impact assessment of public institutions and specialized institutions and derives how much they contribute to improving human rights risk and respect for human rights, and what will be improved in the future. Therefore, the results of this study are expected to be of great help in the introduction and internalization of the human rights management system of public institutions.

본 연구에서는 한중 FTA로 인하여 우리나라 대중 농산물 수입액이 어떠한 영향을 받았는 지를 품목별 미시자료와 다기간 이중차분모형을 적용하여 분석하였다. 2010년부터 2019년까지 FAO (Food & Agriculture Organization)의 품목별 대중 농산물 수입액과 연도별 양허 자료를 이용하여 2015년 이후 한중 FTA로 인한 품목별 양허가 우리나라 대중 농산물 수입액에 미친 영향을 분석하였다. 연도별 양허효과가 동일하다고 가정하면 양허로 인하여 양허대상 품목이 약 680~693만 불의 수입 증가 효과가 존재하고 있었다. 그리고 연도별 양허효과가 상이하다고 가정하면 2016년, 2017년 및 2019년은 양허대상 품목의 수입증가 효과가 통계적으로 유의한 것으로 나타났지만 2018년은 통계적 유의성이 낮았다.

The U.S. Nuclear Regulatory Commission (NRC) states that every environmental report prepared for the licensing stage of a Pressurized Water Reactor shall contain a statement concerning risk during the transportation of fuel and radioactive wastes to and from the reactor. Thus, the licensee should ensure that the radiological effect in accidents, as well as normal conditions in transport, do not exceed certain criteria or be small if cannot be numerically quantified. These are specified in 10 CFR Part 51 and applied in NUREG-1555 Supplement 1 Revision 1, which deals with Environmental Standard Review Plan. Corresponding regulations in Korea would be the Nuclear Safety and Security Commission Notice No. 2020-7. In Appendix 2 of the Notice, guides on the radiological environmental report for production and utilization facilities, spent nuclear fuel interim storage facilities, and radioactive waste disposal facilities. In this guide, unlike the regulations in the U.S., there are no obligations for radiological dose assessment for workers and public during the transportation. Therefore, overall regulations and their legal basis related to risk assessment during transportation conducted for the environmental report in the U.S. were analyzed in this study. On top of that, through the comparison with regulations in Korea, differences between the two systems were figured out. Finally, this study aims to find the points in terms of assessing transport risk to be revised in the current regulatory system in Korea.

Important medical radionuclides for Positron Emission Tomography (PET) are producing using cyclotrons. There are about 1,200 PET cyclotrons operated in 95 countries based upon IAEA database (2020). Besides, including PET cyclotrons, demands for particle accelerators are continuously increasing. In Korea, about 40 PET cyclotrons are in operating phases (2020). Considering design lifetime (about 30-40 years) and actual operating duration (about 20-30 years) of cyclotrons, there will be demands for decommissioning cyclotron facilities in the near future. PET cyclotron produces radionuclides by irradiating accelerated charged particles to the targets. During this phase, nuclear reactions (18O(p,n)18F etc.) produce secondary neutrons which induce neutron activation of accelerator itself as well as surrounding infrastructures (the ancillary subsystems, peripheral equipment, concrete walls etc.). Generally, experienced cyclotron personnel prefer an unshielded cyclotron because of the repair and maintenance time. In unshielded cyclotron, water cooling systems, air compressor, and other equipment and structures could be existed for operating purposes. Almost all the equipment and structures are consisted of steel, and these affect neutron distribution in vault especially thermal neutron on the concrete wall. In addition, most of them can be classified as very low level radioactive wastes by Nuclear Safety and Security notice (NSSC Notice No. 2020-6). However, few studies were estimating radioactivity concentrations (Bq/g) of surrounding structures using mathematical calculation/simulation codes, and they were not evaluating the effect of surrounding structures on neutron distribution. In this study, by using computational neutron transport code (MCNP 6.2), and source term calculation code (FISPACT- II), we evaluated effect of the interaction between surrounding structures (including surrounding equipment) and secondary neutrons. Discrepancies of activation distribution on/in concrete wall will be occur depending on thickness of structure, distance between structures and walls, and consideration of interaction between structures and neutrons. Throughout this study, we could find that the influence of those structures can affect neutron distribution in concrete walls even if, thickness of the structure was small. For estimating activation distribution in unshielded cyclotron vault more precisely, not only considering cyclotron components and geometry of target, but also, considering surrounding structures will be much more helpful.

Currently, as the saturation capacity of wet storage pool for spent nuclear fuel (SNF) of PWR in Korea has reached approximately 75%, Dry Storage Facilities (DSF) are necessary for sustainable operation of nuclear power plants. It is necessary to develop acceptance requirements for the delivery of SNF from reactor storage site to Centralized DSF. To do this end, the mechanical integrity of SNF is directly related to its repacking, retrieving, and transporting/handling performances. And also, this integrity is a key factor associated with the criticality safety that is connected to the damaged status of SNF. According to the NUREG/CR-6835, the NRC expects that the potential for nuclear fuel failures will increase because of the increase of the fuel discharge burnup and the degradation of fuel and clad material properties. Due to such damages and/or degradation, the fuel rods in the fuel assembly may be extracted and empty for following treatments (transportation, storage, handling etc). This condition can have a detrimental effect on the criticality safety of SNF. Thus, this study investigated whether extracted and empty of damaged SNF rod affects criticality safety. In this analysis, it is assumed that up to four fuel rods are missed. As a result of the analysis, As the number of fuel rods miss up to a certain number, the value of multiplication factor value of the fuel assembly increases. In addition, since the fuel rods located at the outermost layer contained relatively less fissile material than the fuel rods located center of the lattice, and neutrons were lost by the absorption material, the effective multiplication factor value gradually decreased. Nevertheless, the criticality safety was assessed to be maintained.

본 연구는 중학생이 지각하는 주 양육자와의 부모애착, 또래관계, 회복탄력성에 대한 인식의 차이를 알아보고, 또래관 계 및 회복탄력성에 영향을 미치는 요인을 알아보고자 하였다. 이를 위해, 중학생 304명을 대상으로 설문 자료를 수집하 였고, SPSS 26.0 프로그램을 사용하여 분석하였다. 본 연구의 주요결과는 다음과 같다. 첫째, 중학생이 지각하는 부모애 착, 또래관계, 회복탄력성은 보통 수준이었고, 개인 배경에 따라 다소 차이가 있었다. 둘째, 또래관계에 영향을 미치는 요 인은 부모애착의 신뢰감과 소외감이었으며, 셋째, 회복탄력성에 영향을 미치는 요인은 부모애착의 신뢰감과 또래관계의 신뢰감, 또래관계의 의사소통으로 나타났다. 결국, 중학생의 또래관계와 회복탄력성을 높이기 위해서는 부모 및 또래와 의 신뢰감을 높이고 또래 간에 긍정적인 의사소통이 이루어지는 것이 중요하다. 결론적으로 부모들은 부모애착에 대한 인식을 새롭게 하고 자녀와의 안정 애착을 함양하기 위해 노력하여야 하며, 학교, 사교육기관 및 교육기업, 지역사회 단 체들은 중학생들이 또래관계에서 신뢰감을 쌓고 긍정적인 의사소통을 통해 회복탄력성을 높일 수 있도록 인성교육과 자 존감 향상 프로그램을 기획하고 운영할 필요가 있다.

Enhancing income for small-scale farmers in developing countries, is one of the major concerns for governments and many stakeholders. This is attributed by the fact that, a majority of smallscale farmers in the region are characterized by low income earners caused by agronomic related challenges, such as low productivity of input factors. In addressing this challenge, the purpose of this study was to assess the impact of outgrower scheme on its members’ income, using the propensity score matching approach. Through this approach the study assessed cross-sectional data, collected from small-scale tea farmers in the Mufindi district, founded in Tanzania. Results of the assessment on the impact of outgrower scheme on its members, suggest that the scheme has a negative and insignificant impact on its members’ income. This implies that, the outgrower scheme does not meet its intended objective of raising the income of its members, due to failure of improving quality as well as quantity of tea produced in the study area.

The present study aims to categorize common word choice errors in Korean EFL writing and help teachers understand students’ word choice patterns. This study reassures that both L1 and its background cultures affect language learners’ choice of vocabulary in English learning. Korean first-year undergraduate students with low levels of English proficiency participated in this study. The students were required to carry out a writing log, a collection of nine pieces of weekly assignments of paragraph writing during the semester. They were allowed to use any type of automatic translation such as Google Translate or Papago for revision and editing. The errors that the students produced were classified into three categories, and significant findings were obtained regarding lexical errors caused by literal translation, cultural differences, and L1 word order. The findings are interpreted in terms of cultural and linguistic differences between the first and target languages. They can give ideas for teachers to instruct EFL writing strategies on students’ word choice errors.

This study investigated the impact of the latest developments in big data analytics capabilities (BDAC) on firm performance. The BDAC have the power to innovate existing management practices. Nevertheless, their impact on firm performance has not been fully is not yet fully elucidated. The BDAC relates to the flexibility of infrastructure as well as the skills of management and firm's personnel. Most studies have explored the phenomena from a theoretical perspective or based on factors such as organizational characteristics. However, this study extends the flow of previous research by proposing and testing a model which examines whether organizational exploration, exploitation and market agility mediate the relationship between the BDAC and firm performance. The proposed model was tested using survey data collected from the long-term employees over 10 years in 250 companies. The results analyzed through structural equation modeling show that a strong BDAC can help improve firm performance. An organization's ability to analyze big data affects its exploration and exploitation thereby affecting market agility, and, consequently, firm performance. These results also confirm the powerful mediating role of exploration, exploitation, and market agility in improving insights into big data utilization and improving firm performance.

Suspended solids play an important role in the growth and survival of aquatic organisms. The marine zooplankton species tested in this study were Tigriopus west (Copepoda) and Haustorioides koreanus (Amphipoda) sampled from the intertidal zone, including Artemia nauplii (Branchiopoda) hatched from cysts. The study design included six concentrations (0, 50, 100, 250, 500, and 1,000 mg L-1) of the suspended test particles assayed in triplicate. Experimental cultures in 500 mL-round polycarbonate bottles were subsampled after 96 h to count dead zooplankton. The culture bottles were agitated at 4 RPM on a rotating wheel at 23°C and 30 PSU. The survival rates of Artemia nauplii and T. west were not affected by suspended solid concentrations higher than 50.0 mg L-1, whereas the survival rate of H. koreanus decreased with increasing concentrations (p<0.05). In conclusion, H. koreanus and T. west, which were continuously exposed to suspended solid concentrations higher than 50.0 mg L-1, were affected by low-intensity ecological stress. However, in the case of H. koreanus, a concentration of 50.0 mg L-1 may be considered to be the limit of tolerance to suspended solids, suggesting that the number of individuals who eventually die will increase if continuously exposed.

Anthropogenic disturbances on freshwater ecosystem are known to degrade biodiversity, especially on fish assemblage. In this study, we have conducted fish surveys to identify impact of a bridge construction on fish assemblages. A total of eight study sites were surveyed in the Danjang and the Dong Stream in southern part of South Korea from June to November in 2021. The fish samplings were carried out five times, using cast-nets (10×10 mm mesh size), scoop-nets (4×4 mm, 5×5 mm mesh size), set-nets (10×10 mm mesh size), and fish traps (3×3 mm mesh size), along with the Stream/River Ecosystem Survey and Health Assessment by the Ministry of Environment of Korea and basic water quality measurement. Also, we applied the species diversity index and length-weight relationship regressions on certain species to identify interspecific growth rate differences in accordance with study sites. As a result, a total of 782 individuals, 23 species and 10 families were collected. The dominant species was Zacco Koreanus and relative abundance was 50.89%. When applying the length-weight relationship regressions on certain species, the ‘b’ value for Z. Koreanus was lower at the downstream points than at the upstream points of the construction site. In addition, when comparing to the results of the past survey, relative density of demersal fish at the upstream and downstream points decreased from 26% to 1.4%, and from 18% to 6.3%, respectively. In conclusion, it is considered that bridge construction negatively affects the habitat of fishes, especially on demersal fishes. Therefore, appropriate conservation efforts such as installation of silt protector and sand sedimentation pond are needed to alleviate the disturbance in habitat such as occurrence of turbidity and destruction of micro-habitats.

This study analyzed the performance of the national fishing port development project, which lacked ex-post impact evaluation despite a lot of investment in terms of fishery income opportunities. Using micro data from the Census of Agriculture, Forestry, and Fisheries, the sales amount of fishery products and the proportion of fishery-related businesses were used as performance indicators. The fishery households in the fishing port area (treatment group) and those not in the area (control group) were classified through data pre-processing, and factors unrelated to the fishing ports were controlled using the propensity score matching difference-in-difference method. The analysis target is six fishing ports with large investment in from 2010 to 2014. As a result of the analysis, it was confirmed that the sales of fishery products increased significantly in four of the six fishing ports, and the proportion of fishery-related businesses increased in two fishing ports. The analysis method of this study can be fully utilized in the evaluation of the Fishing Community New Deal 300 Project, which is in need of performance analysis.