• Journal of Practical Engineering Education
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• v.13 no.2
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• pp.283-292
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• 2021

As universities have operated non-face-to-face semesters due to COVID-19, although instructors applying flipped learning to their classes also have changed it into non-face-to-face ways, there is still a lack of exploratory research on effectiveness of the new form of flipped learning. In this study, we explored the effectiveness of the non-face-to-face flipped learning by analyzing students' learning experiences throughout FGI and survey. By doing so, we sought to provide in-depth insights for successful implications of non-face-to-face flipped learning classes ultimately. The findings showed that many learners positively evaluated non-face-to-face flipped learning in terms of interactions, including quizzes, team activities, and interpersonal interactions (e.g., Q&A, feedback) with professors in non-face-to-face flipped learning classes. The result of the survey also showed significant differences in the pre-post test regarding learner's perceived learning achievement. Based on these findings, the implications were discussed.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.25 no.2
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• pp.320-326
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• 2021

AVTE(Air Vehicle Test Equipment) is an equipment to inspect and check the status of on-board aircraft LRUs(Line Replacement Units) before and after flight for performing successful UAV(Unmanned Aerial Vehicle) missions. This paper suggests utilization of the AVTE as an operation support-equipment by implementing several critical functions for UAV-operation on the AVTE. The AVTE easily sets initialization(default) data and compensates for the installation and position errors of the LRUs which provide critical mission data and situation image with pilots without additional individual operation support-equipment. Major fault list and situation image data could be downloaded after flight using the AVTE in the event of UAV emergency situation or unusual occurrence on duty as well. We anticipate the suggested operational approach of the AVTE could dramatically reduce the cost and man power for design and manufacture of additional operation support equipment and effectively diminish workload of the operator.

• The Journal of the Korea Contents Association
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• v.21 no.7
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• pp.248-258
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• 2021

24-hour monitoring is required to maintain the city's lifeline function in the underground facility for public utilities. And it is necessary to develop technology to exchange the shortage of human resources. It is difficult to reflect the specificity of underground space management in general management methods. This study proposes underground facility for public utilities digital twin system requirements. The concept of space is divided into physical space and virtual space, and the physical space constitutes the type and layout of the sensor that is the basis for the construction of the multimodal image sensor system, and the virtual space constitutes the system architecture. It also suggested system functions according to the task. It will be effective in preventing disasters and maintaining the lifeline function of the city through the digital twins.

• Journal of the Society of Disaster Information
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• v.18 no.4
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• pp.746-753
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• 2022

Purpose: The purpose of this study is to review the safety of small tunnels for food storage excavation in the 1960s~1970s and to improve the stability of small tunnels. Method: A visual inspection and a hammer test were used to conduct safety tests, and the visual inspection is one of the tests conducted for non-destructive testing, and the hammer test is one of the types of hitting methods of rebound hardness. Result: According to the integrated analysis of the survey area data, there are generally good appearance, but there are many small cracks and complex geological conditions, requiring continuous observation and attention. Seven of the 23 tunnels require safety diagnosis, one collapse, one safe, and 14 require continuous observation and attention. Conclusion: All parts of small tunnels should be checked and recorded from time to time, and stability is expected to be improved when reinforcing small tunnels proposed in this study.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.470-470
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• 2023

하천 및 저수지의 수량자료 수집을 위해 부자식 또는 레이더식 수위계 등의 계측기를 이용하여 수위의 변화를 측정한다. 그러나, 수량 모니터링을 위해 설치되는 계측기와 유지관리를 위한 인력소모 비용의 이유로 일부 지역에서만 제한적으로 수행되고 있어 정확한 수문 해석에 한계가 있다. 이에 본 연구에서는 저가의 센싱장비와 라즈베리파이를 활용한 ICT 기술을 수량 모니터링분야에 적용하여 수위 모니터링 기술을 개발하고자 한다. 라즈베리파이(Raspberry Pi 3 B Model)는 오픈소스 기반의 초소형 컴퓨터로 여러 센서를 연결하여 다양한 수문 인자(토양수분, 온도, 수위 등)들을 측정할 수 있으며, 통신 모듈이 기본 내장되어 있어 통신망 구축을 통해 측정데이터를 데이터베이스에 저장할 수 있다. 수위센서(eTape)와 초음파센서를 연결하여 실제 하천 유량 모니터링에 활용되고 있는 부자식 수위계 장비와 비교 분석을 통해 활용 가능성을 검증하고자 하였다. 검증방법은 인공강우실험을 위해 설치된 플륨관에 수위센서(eTape)와 초음파센서를 부착하여 기존 운영중인 부자식 수위계와 비교하였다. 부자식 수위계의 측정결과와 두 센서의 상관관계를 분석한 결과 결정계수(R²)가 0.94 이상으로 나타났다. 분석결과와 같이 기존 고가의 수위 관측장비들을 대체하여 저가의 센서 기반 모니터링 장비들의 실용화가 가능할 것이라 판단된다. 향후 연구에서는 다양한 센서(수위, 초음파, 카메라 등)를 이용하여 농업용수 물수지 분석에 활용할 계획이다. 농업용수는 수자원 총량 중 차지하는 비율이 높음에도 불구하고 정량적 데이터가 부족한 실정이며, 지역별 공급 특성이 다양하여 이를 계량화하기 위해서는 다수의 계측기가 필요하다. 따라서, 본 연구에서 개발중인 센서를 활용하여 물순환 과정의 정량적인 계측을 통해 농업용수의 효율적인 관리 및 농업용수의 하천기여도 평가 자료로 활용될 수 있을 것으로 판단된다.

• Journal of Marine Life Science
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• v.3 no.1
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• pp.22-30
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• 2018

In this study, pilot study on the introduction of stationary fishery was performed to solve the problem of fisheries resource reduction. The Fyke net, which is a test fishing net was selected considering the environment, operation and management costs of Ulleungdo, conditions that can be operated by small fishing vessels and personnel. As a result of 11 times survey using Fyke net from April to May 2017, 2,735 individuals and 983.4 kg caught and the dominant species were red seabream, yellowtail, olive flounder, mitra squid, horse mackerel, filefish, etc. In conclusion, if the production of squid, which is one of the major fisheries resources of Ulleungdo, is continuously decreased, it is considered that introduction of small-scale stationary fishery such as Fyke net would be useful as a means replace income of fishermen.

• Proceedings of the Korea Water Resources Association Conference
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• 2020.06a
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• pp.320-320
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• 2020

하천이용을 위한 다양한 개발사업이 이루어지고 있고 대규모 보가 설치되면서 과거와는 다른 변화된 수리조건에서 기존의 방법으로는 유량자료 생산이 더욱 어려워졌기 때문에 자동유량측정시설의 필요성이 증대되어 조위나 배수 영향을 받는 지점에서 기존 방식을 대체하거나 보완할 수 있는 새로운 유량측정방법으로 자리매김하게 되었다. 자동유량측정시설은 2020년 4월 현재 기준으로 한강 19개소, 낙동강 23개소, 금강 10개소, 영산간 10개소 총 62개소가 운영 중이다. 하지만 4대강 사업 이후, 수질 문제 등의 이유로 2017년 6월부터 순차적으로 4대강 보를 개방하여 보 운영수위에 따라 유속측정이 곤란한 관측소가 증가하고 있으며 이로 인해 환경부 수자원정보센터에서는 보 운영 별 최저수위에서도 자동유량측정시설 운영이 가능하도록 시설물을 개선하는 사업을 실시하고 있다. 개선사업 기간 동안 자료생산의 공백이 발생하지 않도록 인력에 의한 유량측정성과를 확보하여 관측소별 대안유량 산정방법을 개발하였다. 개발된 대안유량은 관측소 개선공사 기간뿐만 아니라 보 운영에 따른 수위저하로 인한 미계측 기간에도 적용하여 유량자료의 손실을 최소화 하도록 하였다. 2019년 운영현황을 범위로 전체 관측소 62개 중 4대강 보 구간에서 관측소 개선공사 8개소와 수위 저하로 유속측정이 불가능한 12개소 중 수위-유량관계곡선식 적용이 가능한 2개소를 제외한 10개소를 대상으로 평균 76일 결측이 발생한 것에 대해 대안유량 산정방법을 적용하여 전 기간 유량자료를 보완하였다. 그 결과 전체 2019년 자동유량측정시설 유량산정률은 99.8%로 자료생산의 공백을 최소화 할 수 있었으며 향후, 보 구간 자동유량측정시설 개선이 완료된 후에도 장비 이상 또는 이상치 발생 시에도 대안유량 산정방법을 활용하여 자료생산의 공백을 최소화 할 수 있을 것으로 기대하고 있다.

• Convergence Security Journal
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• v.23 no.4
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• pp.153-158
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• 2023

Massacres of civilians are being committed in the Russia-Ukraine war, and the war is becoming a long-term war due to a lack of support for reserve combat forces. Considering the reality that South Korea is experiencing a rapid population decline and is rapidly entering an aging society, we are at a point where the nature of the war with North Korea must change. Among them, if private security guards are placed under the control of the police as regular security and crime prevention personnel and used as an alternative resource for reserve forces to ensure the safety of wartime areas and residents and prepare for long-term wars, it will help preserve combat power and maintain sustainability.Regarding private security, considering Japan's further development, we compared it with ours and looked into ways to utilize it as a reserve force for a divided country. In a future where low birth rates will lead to a decrease in military strength, if private security guards are used in local security vacuums during peacetime and participate in local defense during wartime, it could help improve the Korean military's reserve force.

• Journal of the Korea institute for structural maintenance and inspection
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• v.12 no.1
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• pp.117-126
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• 2008

In this paper, it is presented a digital image processing method and the program (Visual C++) to determine the shape of the suspension bridge. To investigate the precision of this method, a suspension bridge is divided into 5, 13 and 19 images, respectively, by using the 6.3M pixels digital camera with 300mm zoom lens. Obtained results of the Kwang-Ahn Grand Bridge by using this method are fairly close to the real precision surveyed data. The accuracy is more improved by increasing the number of divided images of the structure. The total cost, man power and time of field survey by this method presented in this study could be much more reduced and the developed program could be applied with little modification for other structures like cable-stayed bridges, if lens compensation algorithms and program access capabilities are improved.

• Journal of Plant Biotechnology
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• v.42 no.2
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• pp.71-76
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• 2015

Developed countries have set seed industry as a new growth engine, which demands strong support from the government. Multinational seed companies such as Monsanto and DuPont have made huge financial investment to secure their major roles in the global market. To spur domestic seed industry performance, Korean government laid out the foundation for developing seed industry through policy promotion in the late 2000s. In this paper, I look at the current state of the domestic and international seed market to provide information for improving the efficiency of the propulsion of the Golden Seed Project (GSP) along with its vision. The increasing size of global giant companies has been regarded to monopolize the world seed industry wherein ten renowned companies occupy 73% of the overall global market. In effect, this causes a price hike due to limited seed choices. Domestic seed market has been stuck in a range due to a sustained low agricultural production resulting in decreased seed demand and market size. Though breeding technologies for rice and vegetables are world-class, the technologies for top global crops such as cabbage, paprika, and forage are insufficient therefore professionals in this field are not easily employed. Moreover, there is a lack in appropriate infrastructure set up in the universities which adds to ineffective training of professionals. Being a key-supporting industry for agriculture, seed industry should be granted with strong and sustainable investment support from the government. In view thereof, GSP, which started in 2012, ambitions to spur researches outlined by excellent professionals in universities and seed companies aimed to drive seed export volume and quality and attain domestic seed self-sufficiency through adoption of export- and import-substitution seed types (10 varieties each) development strategies. To develop Korea's seed industry excellent achievement of GSP's goals should be drawn successfully and to do this beside development of high quality seeds, support programs for promotion of seed exports are also needed.