• 한국차세대컴퓨팅학회논문지
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• 제13권4호
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• pp.7-18
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• 2017

현대사회에서 가장 중요한 에너지원 중 하나인 전력 에너지는 적절한 수요 공급 조절이 매우 중요하다. 하지만 수요 예측을 위해 필요한 전력데이터는 전력 사용자의 행위에 대한 정보가 포함 될 수 있어, 이를 분석할 경우 프라이버시 침해 문제로 이어질 수 있다. 이에 본 논문에서는 사용자의 전력 사용 정보에 회귀 분석을 적용하여 사용자의 향후 전력 사용량을 예측하되, Intel SGX가 제공하는 안전한 실행 환경 상에서 이를 수행함으로써 사용자의 전력 사용 정보를 안전하게 보호하는 방법을 제안한다. 다양한 차수의 회귀 관계식에 대한 실험을 수행하여 오차를 최소로 하는 회귀 관계식을 선정하였으며, 제안하는 방법을 이용하면 프라이버시 보호 기능을 제공하는 기존의 전력 수요 예측 방법보다 낮은 평균오차율을 보임을 확인하였다.

• Nuclear Engineering and Technology
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• 제55권6호
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• pp.2315-2324
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• 2023

Space nuclear reactors are becoming popular in deep space exploration owing to their advantages of high-power density and stability. Following the fourth-generation nuclear reactor technology, a conceptual design of the dual drum-controlled space molten salt reactor (D²-SMSR) is proposed. The reactor concept uses molten salt as fuel and heat pipes for cooling. A new reactivity control strategy that combines control drums and safety drums was adopted. Critical physical characteristics such as neutron energy spectrum, neutron flux distribution, power distribution and burnup depth were calculated. Flow and heat transfer characteristics such as natural convection, velocity and temperature distribution of the D²-SMSR under low gravity conditions were analyzed. The reactivity control effect of the dual-drums strategy was evaluated. Results showed that the D²-SMSR with a fast spectrum could operate for 10 years at the full power of 40 kWth. The D²-SMSR has a high heat transfer coefficient between molten salt and heat pipe, which means that the core has a good heat-exchange performance. The new reactivity control strategy can achieve shutdown with one safety drum or three control drums, ensuring high-security standards. The present study can provide a theoretical reference for the design of space nuclear reactors.

• 의학교육논단
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• 제25권2호
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• pp.84-101
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• 2023

Longitudinal data can provide important evidence with the potential to stimulate innovation and affect policies in medical education and can serve as a driving force for further developments in medical education through evidence-based decisions. Tracking and observing cohorts of students and graduates using longitudinal data can be a way to link the past, present, and future of medical education. This study reviewed practical methods and technical, administrative, and ethical considerations for the establishment and operation of a longitudinal database and presented examples of longitudinal databases. Cohort study design methods and previous examples of research using longitudinal databases to explore major topics in medical education were also reviewed. The implications of this study are as follows: (1) a systematic design process is required to establish longitudinal data, and each university should engage in ongoing deliberation about this issue; (2) efforts are needed to alleviate "survey fatigue" among respondents and reduce the administrative burden of those conducting data collection and analysis; (3) it is necessary to regularly review issues of personal information protection, data security, and ethics regarding the survey respondents; and (4) a system should be established that integrates and manages a longitudinal database of medical education at the national level. The hope is that establishing longitudinal data and cohorts at individual medical schools will not be a temporary phenomenon, but rather that they will be well utilized at the national level to innovate and implement ongoing changes in medical education.

• 한국의학물리학회지:의학물리
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• 제33권4호
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• pp.53-62
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• 2022

In this study, we have investigated the shielding evaluation methodology for facilities using kV energy generators. We have collected and analysis of safety evaluation criteria and methodology for overseas facilities using radiation generators. And we investigated the current status of shielding evaluation of domestic industrial radiation generators. According to the statistical data from the Radiation Safety Information System, as of 2022, a total of 7,679 organizations are using radiation generating devices. Among them, 6,299 facilities use these devices for industrial purposes, which accounts for a considerable portion of radiation. The organizations that use these devices evaluate whether the exposure dose for workers and frequent visitors is suitable as per the limit regulated by the Nuclear Safety Act. Moreover, during this process, the safety shields are evaluated at the facilities that use the radiation generating devices. However, the facilities that use radiating devices having energy less than or equal to 6 MV for industrial purposes are still mostly evaluated and analyzed according to the National Council on Radiation Protection and Measurements 49 (NCRP 49) report published in 1976. We have investigated the technical standards of safety management, including the maximum permissible dose and parameters assessment criteria for facilities using radiation generating devices, based on the NCRP 49 and the American National Standards Institute/Health Physics Society N.43.3 reports, which are the representative reports related to radiation shielding management cases overseas.

• 문화기술의 융합
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• 제9권3호
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• pp.579-585
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• 2023

본 연구의 목적은 텍스트네트워트분석을 통해 스토킹에 대한 정치성향의 언론기사 내에 핵심 단어를 탐색하고 내재된 의도를 살펴보는 것이다. 2018년 1월 1일부터 2022년 12월 31일까지 보도된 보수언론기사(조선일보, 중앙일보) 824건, 진보언론기사(한겨레신문, 경향신문) 783건으로 총 1,607건을 선정하여 LDA(Latent Dirichlet Allocation) 기반의 토픽모델링 기법으로 도출된 주제범주의 양상을 탐색하였다. 연구결과는 보수언론과 진보언론의 공통된 토픽은 젠더폭력의 인식개선, 신변보호 및 처벌강도, 스토커 신상공개 도출되었고 두 언론의 상이한 토픽은 보수언론에서는 스토커의 가해행위, '신당역 살인사건'의 개요와 진보언론은 '신당역 살인사건'의 가중처벌요구, (사이버공간의) 성착취 범죄 근절로 구성되었다. 본 연구는 스토킹에 대한 언론기사 간의 이념적 의견에 따라 보도형태에 변화가 있음을 시사한다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2022년도 학술발표회
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• pp.510-511
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• 2022

물관리기본법의 시행 및 제1차 국가물관리기본계획의 이행에 따라 물관리 자료의 정보화 요구가 증가하고 있다. 과거 농업용수관리는 기초자료의 오류, 계측데이터의 부족 등이 한계점으로 지적되었으며, 과학화·표준화된 농업용수 물수급 분석 체계 구축 및 물정보의 정확성이 요구된다. 최근 통합물관리 국가정책 대응을 위한 물수급 분석 기반 마련을 목적으로 한국농어촌공사에서는 농업용수 용 배수 계통 정밀조사, 공간자료 재구축 등을 통한 농업용수 디지털 정보체계 구축 사업이 진행되고 있다. 연속수치지형도 및 토지피복, 스마트팜맵 등의 디지털 공간자료를 수집하고 현장조사와 영농조사를 바탕으로 최신화된 용배수계통도, 수혜면적 자료를 구축하였다. 본 연구에서는 디지털화한 용배수계통도를 이용하여 수리해석 모델 기초자료를 구축하고, 들녘단위 (주·보조수원, 저수지 및 양수장 등) 용수계통도 구현함으로써 수원공별 용수공급 네트워크를 분석하고자 한다. 농업용수 공급체계 반영이 가능한 EPA-SWMM (United States Environmental Protection Agency Storm Water Management Model)을 활용하여 다양한 물공급 시나리오를 적용하여 최적의 물관리 방안을 제시하고자 한다. 본 연구에서는 경기도 안성시 고삼저수지를 대상으로 연속수치지형도, 농경지전자지도, 고해상도 DEM 등을 활용한 디지털 조사와 수로 표고, 길이 및 너비 등 현장조사를 수행하였으며, 현장 물관리 방안을 적용하여 물분배 모의가 가능한 EPA-SWMM 기반 수원공-용수로-수혜구역을 연결하는 용수공급 네트워크를 구축하였다. 농촌용수종합정보시스템 (Rural Agricultural Water Resource Information System, RAWRIS)에서 제공하는 계측 자료를 활용하여 관개기간의 강수량, 소비수량, 증발산량, 공급량 등을 적용하여 농업용수 공급량, 배분량을 추정하였다. 본 연구의 결과는 물관리 담당자에게 상세한 현행 용수공급량 및 용수공급체계 정보 제공과 향후 국가물관리기본계획, 농어촌용수이용합리화계획의 물수급 분석 기초자료로 활용 가능할 것으로 사료된다.

• 대한방사선기술학회지:방사선기술과학
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• 제46권5호
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• pp.435-444
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• 2023

The purpose of this study was to analyze the factors that demographic factors, radiation knowledge level, and radiation awareness could be affecting the benefits of radiation. From July 2022 to July 2023, after receiving consent to participate by using the link of Naver through Social Network Service (SNS) for the general public, 312 people were surveyed by self-registration method without collecting personal information. The questionnaire consisted of a total of 25 questions following demographic factors (5 questions including age group by life cycle, sex, monthly household income, residence), radiation knowledge level (8 questions including basic physical, biological effects, radiation protection technology), radiation awareness (12 questions including risk, management, benefit). Independent sample T-test and ANOVA tests were performed for significant differences in the average radiation awareness between variables, and hierarchical regression was performed to identify influencing factors on radiation benefits. As a result, the benefit of radiation was significantly high among the radiation awareness, but the awareness of the danger of radiation was insufficient to the level of recognizing it as safe. Men had significantly higher awareness of radiation management and benefits than women, and the awareness of radiation management was significantly higher in the middle class with a monthly household income of 4.31 million won or more. The higher the knowledge level of radiation, the higher the awareness of the benefits of radiation. The factors that had a positive effect on radiation benefits were the high level of radiation knowledge and awareness of radiation management.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2023년도 임시총회 및 춘계학술대회
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• pp.40-40
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• 2023

Atopic dermatitis is a chronic inflammatory skin diseases caused by skin barrier dysfunction. Allium victoralis var. Platyphyllum (AVP) is a perennial plant used as vegetable and herbal medicine. The purpose of this study was to suggest that AVP is a new cosmetic material by examining the effects of AVP on the skin barrier and inflammatory response. A bibliometric network analysis was performed through keyword co-occurrence analysis by extracting author keyword from 69 articles retrieved from SCOPUS. We noted the anti-inflammatory activity shown by the results of clustering and mapping from network visualization analysis using VOSviewer software tool. HPLC-UV analysis showed that AVP contains 0.12 ± 0.02 mg/g of chlorogenic acid and 0.10 ± 0.01 mg/g of gallic acid. AVP at 100 ㎍/mL was shown to increase the mRNA levels of filaggrin and involucrin related to skin barrier function by 1.50-fold and 1.43-fold, respectively. In the scratch assay, AVP at concentrations of 100 ㎍/mL and 200 ㎍/mL significantly increased the cell migration rate and narrowed the scratch area. In addition, AVP suppressed the increase of inflammation-related factors COX-2 and NO and decreased the release of β-hexosaminidase. This study suggests that AVP can be developed as a functional cosmetic material for atopy management through skin barrier protection effects, anti-inflammatory and anti-itch effects.

• Proceedings of the National Institute of Ecology of the Republic of Korea
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• 제4권4호
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• pp.159-176
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• 2023

The conservation of the raccoon dog (Nyctereutes procyonoides) in South Korea requires the protection and preservation of natural habitats while additionally ensuring coexistence with human activities. Applying habitat map modeling techniques provides information regarding the distributional patterns of raccoon dogs and assists in the development of future conservation strategies. The purpose of this study is to generate potential habitat distribution maps for the raccoon dog in South Korea using geospatial technology-based models. These models include the frequency ratio (FR) as a bivariate statistical approach, the group method of data handling (GMDH) as a machine learning algorithm, and convolutional neural network (CNN) and long short-term memory (LSTM) as deep learning algorithms. Moreover, the imperialist competitive algorithm (ICA) is used to fine-tune the hyperparameters of the machine learning and deep learning models. Moreover, there are 14 habitat characteristics used for developing the models: elevation, slope, valley depth, topographic wetness index, terrain roughness index, slope height, surface area, slope length and steepness factor (LS factor), normalized difference vegetation index, normalized difference water index, distance to drainage, distance to roads, drainage density, and morphometric features. The accuracy of prediction is evaluated using the area under the receiver operating characteristic curve. The results indicate comparable performances of all models. However, the CNN demonstrates superior capacity for prediction, achieving accuracies of 76.3% and 75.7% for the training and validation processes, respectively. The maps of potential habitat distribution are generated for five different levels of potentiality: very low, low, moderate, high, and very high.

• Journal of Ecology and Environment
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• 제47권3호
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• pp.146-156
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• 2023

Background: Endemic species are important components in the flora of most world regions. Most of these species have become threatened and exposed to extinction within the last few years. The present study aims to evaluate the ecosystem services offered by the endemic plant taxa in Egypt and the threats that affect them. Twenty-five field visits were conducted during summer 2018 to spring 2022 to several locations all over Egypt. In each location, the main habitats, national distribution, abundance, goods and threats were recorded. Results: Egypt has 41 endemic taxa belonging to 36 genera and 20 families inhabiting 10 main habitats. Rocky surfaces and sandy formations have the highest number of endemic species. The relation between the number of endemic taxa and the abundance categories indicated that 2 taxa are rare (4.9% of the total taxa), while the remaining were very rare (95%). The most represented offered good was the medicinal uses (32 taxa = 78%), while fuel plants were only represented by 2 taxa (2 taxa = 4.9%). Besides, 14 taxa (34.1% of the total studied taxa) have at least 1 environmental service. Soil fertility (7 taxa = 50%) was the most represented, followed by sand accumulations (6 taxa out of 14 taxa = 43%), while shading plant was the least (1 taxon = 7.1%) (Rosa arabica). The most represented threat is over-cutting and over-collecting (38 taxa = 92.7%), while mining and quarrying is the least represented (4 taxa = 9.8%). Conclusions: The potential and actual goods, services and threats of the endemic taxa were assessed as follows; field observation, information collected from local inhabitants and herbalists, and a literature review. The present study recommended planning a strategy about the importance, threats and conservation of endemic taxa in Egypt that would help in the protection and rescue of these plants and increase awareness about the importance of these plants.