• 한국학교수학회논문집
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• 제25권2호
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• pp.149-174
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• 2022

본 연구는 수학교실에서 인공지능(AI)을 활용한 교수학습 방안을 탐색하는 것을 목적으로 한다. 이를 위해 교육에서의 AI 활용 영역을 조사하여 수학교실에서 AI를 활용한 수학교육의 방향을 전망해 보고, 중학교 통계 단원에서 AI를 활용한 시나리오 개발을 통해 수학 수업에 AI를 도입하였을 때 고려되어야 할 사항들을 함께 제시하였다. 본 연구는 현재 분절적으로 개발되어 활용되고 있는 AI와 에듀테크(EduTech) 기술들이 수학교실에서 어떻게 통합적으로 활용될 수 있는지를 중학교 통계 단원에서 시나리오 개발을 통해 구체적으로 살펴보았다는 것에 그 의의가 있다. 이후 본 연구의 내용을 토대로 수학교실에서 유의미한 AI 활용을 위한 시사점을 도출하였다.

• 한국군사과학기술학회지
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• 제25권6호
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• pp.617-627
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• 2022

Military training is an essential item for the fundamental problem of war. However, there has always been a problem that many resources are consumed, causing spatial and environmental pollution. The concepts of defense modeling and simulation and CGF(Computer Generated Force) using computer technology began to appear to improve this problem. The Naval Operations, Resources Analysis Model(NORAM) developed by the Republic of Korea Navy is also a DEVS(Discrete Event Simulation)-based naval virtual force analysis model. The current NORAM is a battle experiment conducted by an operator, and parameter values such as maneuver and armament operation for individual objects for each situation are evaluated. In spite of our research conducted evolutionary, supervised, reinforcement learning, in this paper, we introduce our design of a scenario creation model based on evolutionary learning using genetic algorithms. For verification, the NORAM is loaded with our model to analyze wartime engagements. Human-level tactical scenario creation capability is secured by automatically generating enemy tactical scenarios for human-designed Blue Army tactical scenarios.

• 자동차안전학회지
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• 제14권2호
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• pp.57-69
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• 2022

Recently, as interest in self-driving cars has increased worldwide, research and development on the Advanced Driver Assist System is actively underway. Among them, the purpose of Adaptive Cruise Control (ACC) is to minimize the driver's driving fatigue through the control of the vehicle's longitudinal speed and relative distance. In this study, for the research of the ACC test in the real environment, the real-road test was conducted based on domestic-road test scenario proposed in preceding study, considering ISO 15622 test method. In this case, the distance measurement method using the dual camera was verified by comparing and analyzing the result of using the dual camera and the result of using the measurement equipment. As a result of the comparison, two results could be derived. First, the relative distance after stabilizing the ACC was compared. As a result of the comparison, it was found that the minimum error rate was 0.251% in the first test of scenario 8 and the maximum error rate was 4.202% in the third test of scenario 9. Second, the result of the same time was compared. As a result of the comparison, it was found that the minimum error rate was 0.000% in the second test of scenario 10 and the maximum error rate was 9.945% in the second test of scenario 1. However, the average error rate for all scenarios was within 3%. It was determined that the representative cause of the maximum error occurred in the dual camera installed in the test vehicle. There were problems such as shaking caused by road surface vibration and air resistance during driving, changes in ambient brightness, and the process of focusing the video. Accordingly, it was determined that the result of calculating the distance to the preceding vehicle in the image where the problem occurred was incorrect. In the development stage of ADAS such as ACC, it is judged that only dual cameras can reduce the cost burden according to the above derivation of test results.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2023년도 학술발표회
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• pp.314-314
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• 2023

Extreme climate events can have a large impact on human life by hampering social, environmental, and economic development. Global circulation models (GCMs) are the widely used numerical models to understand the anticipated future climate change. However, different GCMs can project different future climates due to structural differences, varying initial boundary conditions and assumptions about the physical phenomena. The multi-model ensemble (MME) approach can improve the uncertainties associated with the different GCM outcomes. In this study, a comprehensive rating metric was used to select the best-performing GCMs out of 11 CMIP5 and 13 CMIP6 GCMs, according to their skills in terms of four temporal and five spatial performance indices, in replicating the 21 extreme climate indices during the baseline (1975-2017) in South Korea. The MME data were derived by averaging the simulations from all selected GCMs and three top-ranked GCMs. The random forest (RF) algorithm was also used to derive the MME data from the three top-ranked GCMs. The RF-derived MME data of the three top-ranked GCMs showed the highest performance in simulating the baseline extreme climate which was subsequently used to project the future extreme climate indices under both the representative concentration pathway (RCP) and the socioeconomic concentration pathway scenarios (SSP). The extreme cold and warming indices had declining and increasing trends, respectively, and most extreme precipitation indices had increasing trends over the period 2031-2100. Compared to all scenarios, RCP8.5 showed drastic changes in future extreme climate indices. The coasts in the east, south and west had stronger warming than the rest of the country, while mountain areas in the north experienced more extreme cold. While extreme cold climatology gradually declined from north to south, extreme warming climatology continuously grew from coastal to inland and northern mountainous regions. The results showed that the socially, environmentally and agriculturally important regions of South Korea were at increased risk of facing the detrimental impacts of extreme climatology.

• 여성건강간호학회지
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• 제28권4호
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• pp.317-328
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• 2022

Purpose: This study aimed to develop an emotive role-play program for nursing students focusing on high-risk pregnancy and analyze its effects on communication skills, clinical performance, and emotional intelligence. Methods: A quasi-experimental nonequivalent comparison group design was adopted with 83 nursing students (experimental group, 45; comparison group, 38) who participated voluntarily in an extracurricular program. The preliminary survey was conducted on November 3 and November 4, 2020, and the follow-up survey was conducted on November 12, 2020, for the comparison group and on November 27, 2020, for the experimental group. A program that included five role-play scenarios related to induced labor, preeclampsia, premature rupture of membranes, preterm labor, and infertility was developed by a group of experts and presented to the experimental group over 11 total hours across 3 days. Each student participated in a role-play scenario as a patient, family member, or nurse and observed three other scenarios. The comparison group received a workbook after the follow-up evaluation. The independent t-test was performed to analyze changes in communication skills, clinical performance, and emotional intelligence. Results: Communication skills (t=1.84, p=.035) and clinical performance (t=2.75, p=.004) significantly increased in the experimental group compared to the comparison group. A significant difference was not observed between the experimental and comparison groups for emotional intelligence (t=1.36, p=.088). Conclusion: The emotive role-play program concerning high-risk pregnancy was effective in improving nursing students' communication skills and clinical performance and can be used in nursing education related to high-risk pregnancy and childbirth.

• 농촌계획
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• 제28권4호
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• pp.93-104
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• 2022

Agriculture is one of the most vulnerable sector to droughts, and drought damage on the agriculture sector could have effects on other sector. Droughts have different characteristics compared to other extreme events, which means more sophisticated methods considering the characteristics of droughts are required when measuring their damage. The purpose of this study is to analyze the damage of droughts based on limited computational general equilibrium model. To be specific, we constructed a CGE model focusing on the agriculture sector in Korea. Also, to limit changes in land use and labor, we limited them, and assume droughts only have effects on productivity of value-added. Lastly, we simulate drought effects on rice production in Korea based on several climate scenarios and GCM to identify the economic effects of droughts. The results show that 1) the cumulated damage of droughts during 2021~2040 is higher than other periods (2040~2061, 2081~2100), 2) the correlation between the damage of droughts and SSP scenarios is insignificant. This result implies the necessity of the effective drought risk management to prevent future droughts effects, irrespective of mitigation policies. 3) Due to increases in rice price, GDP of rice sector is increased. However, GDP of the other sector and consumer welfare are decreased. This result show that indirect effects of droughts would be more important when measuring drought effects on agriculture sector.

• Nuclear Engineering and Technology
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• 제55권2호
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• pp.725-733
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• 2023

The Korea Institute of Radiological and Medical Sciences has started a radiation epidemiological study, titled "Korean Radiation Worker Study," to evaluate the health effects of occupational exposure to radiation. As a part of this study, we investigated the methodologies and results of reconstructing organ-specific absorbed doses based on personal dose equivalent, H_p(10), reported from 1984 to 2019 for 20,605 Korean radiation workers. For the organ dose reconstruction, representative exposure scenarios (i.e., radiation energy and exposure geometry) were first determined according to occupational groups, and dose coefficients for converting H_p(10) to organ absorbed doses were then appropriately taken based on the exposure scenarios. Individual annual doses and individual cumulative doses were reconstructed for 27 organs, and the highest values were observed in the thyroid doses (on average 0.77 mGy/y and 10.47 mGy, respectively). Mean values of individual cumulative absorbed doses for the red bone marrow, colon, and lungs were 7.83, 8.78, and 8.43 mSv, respectively. Most of the organ doses were maximum for industrial radiographers, followed by nuclear power plant workers, medical workers, and other facility workers. The organ dose database established in this study will be utilized for organ-specific risk estimation in the Korean Radiation Worker Study.

• 한국수자원학회논문집
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• 제56권5호
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• pp.347-356
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• 2023

상수도시스템에서는 적수 및 누수와 같은 다양한 수리 및 수질적 비정상상황이 발생한다. 이를 방지하거나 빠르게 복구하기 위하여 다양한 계측기에서 얻어지는 데이터를 통해 사고를 예상하고 탐지한다. 하지만 대표적인 수리학적 비정상상황인 누수의 경우 직접적인 탐사를 수행하지 않는다면 발견되기 어렵다. 그 중 미신고 파열누수의 경우 육안식별이 어렵기 때문에 가장 많은 누수를 차지하게 되며 이는 곧 큰 경제적 손실로 이어진다. 직접적인 탐사의 경우 전문인력 확보 등 현장의 여건 등 여러 한계점이 존재한다. 이를 해결하기 위해 본 연구에서는 검보정이 완료된 상수도관망 수리모형(EPANET)의 수리해석결과 데이터를 학습데이터로 사용하고 Deep neural network 알고리즘을 활용하여 누수규모 및 누수위치에 대한 누수탐사를 수행하였다. 누수탐사 수행을 위해 모의 누수 사고데이터를 생성하였으며 누수규모, 위치 등 다양한 시나리오를 고려하였다. 또한, 최적의 누수 탐지 성능을 위해 관망의 크기, 계측기의 종류, 개수, 위치에 따른 탐지성능을 분석하였다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2022년도 학술발표회
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• pp.450-450
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• 2022

The study aims to develop scenarios for efficient groundwater use using existing wells in order to prepare for an eventual drought. In the recent decades, droughts are not only intensifying, but they are also spreading into territories where droughts used to be less intense and relatively infrequent. With the increasing disaster, efficient groundwater use is urgently needed not only to prevent the problem of groundwater depletion but also drought risk reduction. Thus, the research addressed the problem of efficient aquifer use as source of water during drought and emergencies. The research focused on well network system applied to Yanggok-ri in Korea using simulation models in visual MODFLOW. The approach consists to variate groundwater pumping rate in the most important wells used for irrigation across the study area and evaluate the pumping effect on water level fluctuation. From the evaluation, the pumping period, appropriate pumping rate of each well and the most vulnerable wells are determined for a better groundwater management. The project results divide the study area into two different regions (A and B), where the wells in the region A (western part of the region) show a crucial drop in water level from May to early July and in august as consequence of water pumping. While wells in region B are also showing a drawdown in groundwater level but relatively less compare to region A. The project suggests a scenarios of wells which should operate considering water demand, groundwater level depletion and daily pumping rate. Well Network System in relevant project, by pumping in another well where water is more abundant and keep the fixed storage in region A, is a measure to improve preparedness to reduce eventual disaster. The improving preparedness measure from the project, indicates its implication to better groundwater management.

• 한국콘텐츠학회논문지
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• 제22권8호
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• pp.274-287
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• 2022

OTT 서비스가 확산되면서 방송 시장에서 경쟁이 심화되고 있다. 콘텐츠 경쟁력이 높은 우리나라는 국제적인 콘텐츠 공급기지가 되고 있다. 이는 국내 콘텐츠 제작업계에게는 도움이 되겠지만, 결국 글로벌 영상산업구조에서 하청으로 편입되는 결과를 초래한다. 그러므로 한국계 OTT 사업자들이 해외진출을 통해 시장을 넓히고, 콘텐츠 경쟁력을 수익 확대로 연결하여 경쟁력을 유지할 필요가 있다. 본 연구는 국내 OTT 사업자의 해외사업에 대하여 사업성을 분석하여 위험도를 줄이고 참고자료를 제공하고자 수행되었다. 전문가 심층인터뷰와 문헌검토를 통해 북미시장을 성공 잠재력이 높은 지역으로 선정하였고, 현지 플랫폼 사업자와의 제휴를 통한 진출이 유효함을 확인하였다. 그리고 매출과 투입비용을 추정하고, 순현재가치법으로 사업성을 평가하였다. 판권비용, 가입자 수, 요금에 대해서는 복수의 추정치를 이용하여 총 18개의 시나리오를 만들었다. 분석결과 8개의 시나리오가 채택 가능한 것으로 나타났다. 그리고 판권비용이 사업성에 가장 큰 영향을 미치며, 요금, 가입자의 순으로 확인되었다.