• 한국농공학회논문집
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• 제63권4호
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• pp.1-12
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• 2021

Agricultural drought is a natural phenomenon that is not easy to observe and predict and is difficult to quantify. In South Korea, the amount of agricultural water used is large and the types of use are varied, so even if an agricultural drought occurs due to insufficient precipitation, the drought actually felt in the irrigated area is it can be temporally and spatially different. In order to interpret the general drought in the past, drought disasters were evaluated using single indicators such as drought damage area, precipitation shortage status, and drought index, and a comprehensive drought management system is needed through drought diagnosis survey. Therefore, we intend to conduct research on agricultural drought assessment and diagnosis using re-evaluation of agricultural facilities and irrigation water supply network due to changes in various conditions such as climate change, irrigation canal network, and evaluation of water supply capacity of agricultural facilities. In this study, agricultural drought diagnosis was conducted on two agricultural reservoirs located in Sangju, Gyeongsangbuk-do, with structural or non-structural evaluations to increase spatiotemporal water supply and efficiency in terms of water shortages. The results of the agricultural drought diagnosis evaluation can be used to identify irrigated areas and canal network vulnerable to drought and to prioritize drought response.

• 한국운동역학회지
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• 제31권2호
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• pp.140-147
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• 2021

Objective: The purpose of this study is to identify the mechanism of changes in maximum voluntary torque with the magnitude and duration of pre-activation torque during voluntary isometric knee extension. Method: 11 male subjects (age: 25.91±2.43 yrs., height: 173.12±3.51 cm, weight: 76.45±7.74 kg) participated in this study. The subjects were required to produce maximal voluntary isometric torque with a particular pre-activation torque condition. The properties of pre-activation torque consisted of the combinations of 1) three levels of magnitude, e.g., 32 Nm, 64 Nm, 96 Nm, and 2) two levels of duration, e.g., 1 sec, and 3 sec; thus, a total of six conditions were given to the subjects. The force and EMG data were measured using the force transducers and wireless EMG sensor, respectively. Results: The results showed that the maximum voluntary torque increased the most with relatively large and fast (96 Nm, 1 sec) pre-activation condition. Similarly, with relatively large and fast (96 Nm, 1 sec) preactivation, it was found that the integrated EMG (iEMG) of the agonist muscles increased, while no significant changes in the co-contraction of the antagonist muscles for the knee extension. Also, the effect of pre-activation conditions on the rate of torque development was not statistically significant. Conclusion: The current findings suggest that relatively larger in magnitude and shorter in duration as the properties of pre-activation lead to a larger magnitude of maximal voluntary torque, possibly due to the increased activity of the agonist muscles during knee extension.

• 동의신경정신과학회지
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• 제32권1호
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• pp.55-66
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• 2021

Objectives: The aim of this scoping review was to analyze research trends about mental health of nurses working in Korean medicine (KM) hospitals in Republic of Korea. Methods: Searches were conducted using four electronic databases including Oriental Medicine Advanced Searching Integrated System, Korean Studies Information Service System, Research Information Sharing Service, Korea Citation Index to collect relevant studies. The search date was March 4, 2021. All studies published up to the search date were considered. Observational studies reporting mental health outcomes of nurses working at KM Hospital were included. Results: A total of 11 cross-sectional observation studies were included. Four of them compared mental health of nurses working on KM and Western medicine (WM). Commonly reported outcomes related to mental health were job satisfaction, role conflict, and work stress. As a result of meta-analysis based on a 5-point Likert scale, the following factors were related to mental health of KM nurses: job satisfaction (2.844±0.067 points), role conflict (3.678±0.058 points), work stress (3.142±0.021 points), turnover intention (3.483±0.028 points), and burnout (3.180±0.033). Compared to WM nurses, KM nurses had significantly less work stress (p=0.000), role conflict (p=0.039), and job satisfaction (p=0.000). Conclusions: Mental health problems of nurses are known to be very common. Although improving them is an important social task, studies on mental health of KM nurses remain insufficient. Based on findings of this study, more cooperation between nurses and KM doctors should be made to improve the mental health of KM nurses, especially their job satisfaction in the future. The Korean Society of Oriental Neuropsychiatry needs to pay more attention to this topic.

• 한국환경복원기술학회지
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• 제24권4호
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• pp.61-75
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• 2021

Roadside greenery in the city is not only a means of reducing fine dust, but also an indispensable element of the city in various aspects such as improvement of urban thermal environment, noise reduction, ecosystem connectivity, and aesthetics. However, in studies dealing with the effect of reducing fine dust through trees in existing urban spaces, microscopic aspects such as the adsorption effect of plants were dealt with, structural changes such as the width of urban buildings and streets, and the presence or absence of trees, Impact studies that reflect the actual form of In this study, the effect of greenery composition applicable to urban space on PM2.5 was simulated through the microclimate epidemiologic model ENVI-met, and field measurements were performed in parallel to verify the results. In addition, by analyzing the results of fine dust background concentration, wind speed, and leaf area index, the sensitivity to major influencing variables was tested. As a result of the study, it was confirmed that the fine dust reduction effect was the highest in the case with a high planting amount, and the reduction effect was the greatest at a low background concentration. Based on this, the cost of planting street green areas and the effect of reducing PM2.5 were compared. The results of this study can contribute as a basis for considering the effect of pedestrian space on air quality when planning and designing street green spaces.

• 한국ITS학회 논문지
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• 제21권2호
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• pp.85-100
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• 2022

최근 디지털 연결성 기반의 융합이 광범위하게 확대되면서 교통 및 모빌리티 분야가 빠르게 변화하고 있으며 이와 관련된 연구도 다양화되고 있다. 본 연구의 목적은 모빌리티 분야의 연구 동향을 분석하고 핵심 연구영역과 주제를 파악하는 것이다. 토픽 모델링 분석은 연구 동향을 파악하는 데 유용한 것으로 입증된 기법이다. 모빌리티를 키워드로 KCI 학술지에서 142편의 논문 초록을 분석하여, 9개의 토픽을 도출하고 스마트 모빌리티 연구의 6개 핵심 요소와 연계하였다. 이를 통해 자율주행을 앞세운 차량 및 수송 기술 분야와 MaaS로 대표되는 교통수단 간 연계 및 통합서비스 분야에 관한 연구가 가장 활발한 것과 사용자의 안전을 확보하기 위한 보험, 법률, 제도, 그리고 기존 산업과의 갈등 해소 등에 관한 연구가 진행되고 있는 것을 확인하였다.

• 한국물환경학회지
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• 제38권5호
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• pp.240-246
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• 2022

Water and energy are inextricably linked and referred to as 'Water-Energy Nexus'. Recently, this topic has been drawing a lot of attention from various studies due to the exacerbated water availability. Korea's water and energy consumption has been increasing consistently, which calls for better management. This paper aims to identify changes in electricity consumption in relation to water intake and purification processes. Using Log Mean Divisia Index (LMDI) Decomposition Analysis method, this study attributes the changes to major factors such as; Total population (population effect), household/population (structure effect), GDP/household (economic effect), and water-related energy use/GDP (unit effect). The population effect, structure effect, and economic effect contributed to an increase in water-related electricity consumption, while the unit effect contributed to a decrease. As of 2019, the economic effect increased the water supply sector's electricity consumption by 534 GWh, the population effect increased by 73 GWh, and the structure effect increased by 243 GWh. In contrast, the unit effect decreased the electricity consumption by -461 GWh. We would like to make the following suggestions based on the findings of this study; first, the unit effect must be improved by increasing the energy efficiency of water intake and purification plants and installing renewable energy power generation facilities. Second, the structure effect is expected to increase over time, and to mitigate it, water consumption must be reduced through water conservation policies and the improvement of water facilities. Finally, the findings of this study are expected to be used as foundational data for integrated water and energy management.

• 사물인터넷융복합논문지
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• 제7권4호
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• pp.23-28
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• 2021

4차 산업혁명을 통하여 인공지능, AR/VR, 빅데이터 등의 다양한 분야에서 급속하게 발전하고 있고, 그 중심에는 소프트웨어가 있다. 교육 분야에서도 기술의 발전을 뒷받침하기 위한 융합교육의 중요성이 강조되고 있는 상황으로, 소프트웨어 기술의 경쟁을 위하여 국내에서는 소프트웨어 개발 인력의 확보가 우선 되어야 한다. 그러나 과거 하드웨어 중심 사회와는 다르게 소프트웨어 기술 인력의 역할은 매우 중요한 사안이나, 기업이 필요한 인재상과는 거리가 있는 인력을 배출하고 있는 실정이다. 본 논문에서는 증강현실 소프트웨어 전문가 양성을 위한 몰입형 교육 모델을 제시하고, 이를 기반으로 몰입형 증강현실 교육 모델의 프로그램과 관련된 질을 파악할 수 있는 평가지표를 제안한다. 제안 모델을 통하여 모델의 장단점을 파악하고, 교육 프로그램의 개선 방향 설정에 기여할 수 있을 것으로 기대된다.

• 한국농공학회논문집
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• 제63권3호
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• pp.13-26
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• 2021

Recent drought events in the South Korea and the magnitude of drought losses indicate the continuing vulnerability of the agricultural drought. Various studies have been performed on drought hazard assessment at the regional scales, but until recently, drought management has been response oriented with little attention to mitigation and preparedness. A vulnerability assessment is introduced in order to preemptively respond to agricultural drought and to predict the occurrence of drought. This paper presents a method for spatial, Geographic Information Systems-based assessment of agricultural drought vulnerability in South Korea. It was hypothesized that the key 14 items that define agricultural drought vulnerability were meteorological, agricultural reservoir, social, and adaptability factors. Also, this study is to analyze agricultural drought vulnerability by comparing vulnerability assessment according to weighting method. The weight of the evaluation elements is expressed through the Analytic Hierarchy Process (AHP), which includes subjective elements such as surveys, and the Entropy method using attribute information of the evaluation items. The agricultural drought vulnerability map was created through development of a numerical weighting scheme to evaluate the drought potential of the classes within each factor. This vulnerability assessment is calculated the vulnerability index based on the weight, and analyze the vulnerable map from 2015 to 2019. The identification of agricultural drought vulnerability is an essential step in addressing the issue of drought vulnerability in the South Korea and can lead to mitigation-oriented drought management and supports government policymaking.

• 한국컴퓨터정보학회논문지
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• 제27권8호
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• pp.31-39
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• 2022

주가는 거래량, 종가 등과 같은 숫자 기반의 내부적인 요인뿐만 아니라 법, 유행 등 여러 외부요인에 의해 영향을 받는다. 수많은 요인이 주가에 영향을 미치기 때문에 단편적인 주식 데이터만을 이용한 정확한 주가 예측은 매우 어려운 일이다. 특히 기업의 가치는 실제 주식을 거래하는 사람들의 인식에 영향을 많이 받기 때문에 특정 기업에 대한 감성 정보가 중요한 요인으로 여겨진다. 본 논문에서는 시간적 특성을 고려한 뉴스 데이터의 감성 분석을 이용한 딥러닝 기반 주가 예측 모델을 제안하고자 한다. 주식과 뉴스 데이터, 서로 다른 특성을 가진 2개의 이종 데이터를 시간 크기에 따라 통합하여 모델의 입력으로 사용하며, 시간 크기와 감성 지표가 주가 예측에 미치는 영향에 대해 최종적으로 비교 및 분석한다. 또한 우리는 기존 모델과의 비교 실험을 통해 제안 모델의 정확성이 개선되었음을 검증한다.

• 한국ITS학회 논문지
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• 제22권2호
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• pp.15-28
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• 2023

경계역은 수도권 도시철도 연락운임정산에서 반영되지 못한 평가지표이다. 경계역은 동일한 노선을 공유하는 2개 운송기관의 경계 지점에 있는 역사로서 선로 운영방식은 영업관리와 유지관리로 구분된다. 지금까지 연락운임정산은 경계역을 영업관리의 관점으로 평가하였다. 한편 수도권 통합대중교통 요금체계는 발전적 차원에서 경계역을 유지관리의 관점으로 해석할 필요성을 요구하고 있다. 본 연구는 유지관리 방식이 도입되는 상황을 염두에 두고 수입금 변화를 정량적으로 분석하는 방안을 마련하였다. 서울교통공사와 KORAIL의 4개 구간의 경계역을 대상으로하여 1일 교통카드자료를 기반으로 운송기관의 수입금 변화를 평가하였다. 본 연구는 향후 수도권 도시철도의 운송수입금 변화를 평가하고 배분하는 분석적 판단을 위한 기초연구로써 의의가 있다고 할 수 있다.