• Journal of Navigation and Port Research
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• v.33 no.10
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• pp.709-713
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• 2009

Water pollution of coast has a significant impact on the fish farm and fisheries. For solving the water pollution problems the fish farms are moving to the open sea. The fish farms in open sea have to operate by the automatic feeding system and remote monitoring system for safety and management. This paper describes an automatic feeding system for fish farms in open sea. Water temperature and fish weight will change depending on the amount of feed. And the fish farm temperature is changed extremely in open sea than on land side. This paper described that the feed amount is calculated automatically according to temperature, fish weight, and the automatic feed system. And the performance of automatic feed system is verified with test model for operation test.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.493-494
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• 2021

항공 산업의 발전으로 개인의 해외여행의 부담이 낮아져 각국의 왕래가 많아지고 있으며 사람들이 느끼는 국가 간 거리감이 크게 축소되고 있다. 또한, 화물의 운송이 활발해지며 이와 함께 화물 항공 물류량이 크게 늘어가고 있다. 항공물류 절차 중 화물적재는 사람들이 작업하고 적재 실수로 인한 사고들이 발생하는 것을 알고 이를 개선하고자 본 연구를 선정하게 되었다. 본 연구를 통해 구현할 '항공기 자동 중량평형 알림 시스템'은 평형 상태일 때 항공기 화물실 각 위치의 무게를 측정하고 적정 평형 값을 계산해 스크린에 출력하고 적정 평형 한계를 초과할 경우 경고음과 스크린을 통해 적정 평형이 아님을 알리는 방식으로 작동된다. 이러한 방식을 통해 조종사와 운항관리사, Load Master들이 잘못된 적재로 인한 화물의 위치를 수정하여 화물적재 과정의 안전핀 역할을 할 수 있다. 따라서 우리는 과제 개발에 따른 기대효과 로 항공사에서 여객기, 대형 수송기 등에 시스템을 추가하여 평형으로 인한 사고를 미연에 방지할 수 있다.

• Nuclear industry
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• v.35 no.6
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• pp.59-61
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• 2015

원전 설비에 대한 포괄적이고 실제적인 정보를 담고 있는 정보 모델이 데이터 중심적 관리의 핵심이다. 이 디지털 정보 모델은 원전 설비나 설비를 구성하고 있는 부분들의 상세 사항을 적정 수준까지 보여줄 뿐 아니라 특정된 규칙에 맞도록 데이터를 저장, 분류, 전달해 주고 상호 연결도 시켜준다. 여기서의 데이터란 현재 운영중인 설비의 특성은 물론, 가동 변수, 중량, 부품들의 크기, 재질의 유형, 설치되어 있는 설비들의 상대적 위치와 관련 부품들의 배치 상태 등을 담은 데이터와 운영 데이터를 말한다.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2009.06a
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• pp.76-77
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• 2009

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2006.11a
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• pp.294-295
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• 2006

• Korean Management Science Review
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• v.1
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• pp.10-16
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• 1984

중량이상 코일을 없앰으로써 이 프로젝트에서 얻은 효과는 수요가 주문에 대한 적중률을 증대시키고, 생산계획 부서의 작업 부하를 크게 경감시켰다. 이 프로젝트에서 보면, 겉으로 보기에는 사소한 문제일지라도 그것이 생산성에 심각한 영향을 미칠 수도 있다는 것을 알 수 있다. 따라서 어떠한 공정에 대해서든 정밀한 분석과 철저한 관리가 정말 중요하다는 사실을 재차 강조하고 싶다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.16 no.4
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• pp.107-115
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• 2012

The present study evaluates the validity of different equations specified in code provisions and proposed by the existing researchers to predict the concrete tensile capacities (direct tensile strength, splitting tensile strength and modulus of rupture) using a comprehensible database including 361 lightweight concrete (LWC), 1,335 normal-weight concrete (NWC) and 221 heavy-weight concrete (HWC) specimens. Most of the equations express the concrete tensile strengths as a function of its compressive strength based on the limited NWC concrete test data. However, the present database shows that the concrete tensile capacities are significantly affected by its unit weight as well. As a result, the inconsistency between experiments and predictions by the different models increases when the concrete unit weight is below 2,100 kg/$m^3$ and concrete compressive strength is above 50 MPa. On the other hand, new models proposed by the present study considering the concrete unit weight predict the tensile strengths of concrete with more accuracy.

• Journal of the Korean Recycled Construction Resources Institute
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• v.8 no.4
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• pp.444-449
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• 2020

In this study, On-Board Truck Scale was installed on the construction waste collection / transportation vehicles to monitor the weight of the waste at all stages from generation to final treatment. It was performed as a case study of a construction waste control technology that can efficiently manage the total generating and recycling amount using real-time weight/location information obtained by the On-Board Truck Scale device. As a result of the study, it was confirmed that the total amount of construction waste can be monitored in real time, and a plan for efficient logistics transportation can be derived through the analysis of operation patterns by managing the real-time transport volume, transport distance, and transport time of the construction waste collection / transportation vehicles. It was confirmed that overloading can be prevented in advance by controlling the loading also.

• Journal of the Korean Geotechnical Society
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• v.33 no.11
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• pp.5-19
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• 2017

This study has been conducted to improve the conventional compaction management method by measuring the water content and dry unit weight of soil using the Time Domain Reflectometry (TDR) method. In order to verify the measured value of the developed flat TDR system, laboratory tests were conducted on six soils. Also, based on laboratory experiments, field tests were conducted to evaluate the applicability of the developed flat TDR system. Also, a comparison experiment was conducted with the Purdue TDR system. In addition, FE analysis was done to confirm the influence range of the Flat probe. As a result, it was confirmed that the influence range was about 10 cm. As a result of laboratory experiment, the water content ratio showed an error of about 0.4% on the average, and in the case of dry unit weight, it showed an error of about 1.6%. For the field test, the water content ratio and unit weight showed an error of 0.8% and 2.5%, respectively. Through the experimental results, it was confirmed that the measured value of the Flat TDR system is more accurate than that of the conventional TDR system.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.26 no.1A
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• pp.143-153
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• 2006

In design of bridges, estimation of actions and loadings is very important for the safety and maintenance of bridges. In general, effect of traffic loading on the bridge can be modeled as live load (including impact load) and fatigue load. For estimation of traffic loading, it is important to get reliable and comprehensive truck statistical data such as the traffic and weight information. To get statistical data, Bridge Weigh-In-Motion (BWIM), which measures the truck weights without stopping the traffic, is need to be developed. In this study, BWIM system with various functions is developed first. Then this system is used to get comprehensive truck data. Traffic loadings including fatigue and live loading are formulated from the truck data acquired from the bridges. Objectives of this study are to develop the BWIM system, to apply the system in test bridge in Highway, and to formulate the live and fatigue loading for bridge design.