• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.20 no.5
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• pp.130-145
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• 2021

As part of the Smart Seoul policy, the importance of using big urban data is being highlighted. Furthermore interest in the impact of transportation-related urban environmental factors such as PM10 and noise on citizen's quality of life is steadily increasing. This study established the integrated DB by matching IoT big data with transportation data, including traffic volume and speed in the microscopic Spatio-temporal scope. This data analyzed the impact of a spatial unit in the road-effect zone on environmental risk level. In addition, spatial units with similar characteristics of road traffic and environmental factors were clustered. The results of this study can provide the basis for systematically establishing environmental risk management of urban spatial units such as PM10 or PM2.5 hot-spot and noise hot-spot.

• Smart Media Journal
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• v.11 no.9
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• pp.30-38
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• 2022

It is important to grasp biometric data in real time for prompt action in the event of a safety accident at a work site where the risk of safety accidents exists. Among them, blood oxygen saturation is the most important factor in maintaining human life, so real-time oxygen saturation measurement and monitoring is necessary according to the situation as a preemptive response for worker safety management. By receiving real-time bio-signals from workers wearing health and life-risk protective clothing, and sharing and analyzing the worker's risk status in an external system, it is possible to diagnose the worker's current condition and efficiently respond to emergencies that may occur to the worker. In this paper, we propose a wearable oxygen saturation measurement platform technology that can monitor the risk of harmful gases and oxygen saturation of the wearer in real time and ensure the wearer's activity and safety in order to cope with emergency situations at the scene of an accident. If we overcome the limitations identified through the results of the proposed system later and apply improved biodata such as motion correction to the platform, we expect that it will be usable not only in hazardous gas environments, but also in hospitals and homes for emergency patients.

• Journal of the Korean Society for Marine Environment & Energy
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• v.11 no.4
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• pp.214-220
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• 2008

The Ballast Water Management Convention provides that ballast water treatment systems which make use of active substances shall be approved from IMO according to the procedure developed by the IMO. The Convention described that active substance means a substance or organism, including a virus or a fungus, that has a general or specific action on or against harmful aquatic organisms and pathogens. The Marine Environment Protection Committee of IMO gave basic approval to 13 ballast water management systems and final approval to 4 systems until October 2008. This paper considered the matter of procedure and documents of the basic and final approval based on the "Procedure for approval of ballast water management systems that make use of Active Substances (G9)" and "The Methodology for information gathering and the conduct of work of the GESAMP-BWWG" and summarized the specifications of the treatment systems which was granted the basic or final approval from IMO and raised several points.

• Journal of environmental and Sanitary engineering
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• v.1 no.1 s.1
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• pp.1-29
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• 1986

The guidelines and regulations that have revised by World Health Organization, the United States of America, Canada and Japan were reviewed for standards relevant to health of the people. The substances and parameters were discussed. Various standards were presented and recent changes in policies were relighted with their scientific information.

• Journal of the Korea institute for structural maintenance and inspection
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• v.14 no.6
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• pp.117-123
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• 2010

If FRP materials that have been known as high durability materials are exposed to harmful environmental factors, deterioration and characteristics of materials can be reduced due to chemical reaction such as hydrolysis. Therefore, to use FRP materials as building major materials, it is important to exactly grasp dynamic properties by use condition. Accordingly, this study stored FRP materials in a strong acid and alkali compound solution for a certain period to conduct simulation for acute or chronic, extreme changes by chemicals, and conducted a test for compressive, tensile, shear and bending strength to analyze changes in strength by kinds and storage days of chemicals. In conclusion, the study findings indicate excellent chemical resistance of FRP materials.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.1A
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• pp.101-108
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• 2009

The performance of high-early strength pavement concrete for large areas is influenced by the physical and chemical environment during service life. Generally, penetration, diffusion, and absorption of harmful materials that exist outside the concrete cause damage to its structure. Thus, we have to use a mixture for durability to keep the required quality for the planned service life. Moreover, in using high-early-strength cement and accelerators, a high heat of hydration to create the initial strength can cause cracks. Based on evaluations from optimal mix proportions of high-early-strength pavement concrete for large areas, we conducted water permeability, abrasion resistance, freeze-thaw, plastic, drying, and autogenous shrinkage tests. Test result showed that a mix of accelerator and PVA fibers showed excellent performance.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2004.11a
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• pp.504-509
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• 2004

Safety assessment of construction projects may be affected by various factors such as types and scale of projects, construction methods, procedure, climactic, and site conditions etc. Presently, in planning and design phases, designers are still often uncertain of their responsibilities, l3i]I information and training of safety. Therefore, designers are still failing to exploit the potential that have to eliminate and reduce risks on site. In this study, the concepts of safety impact assessment is introduced in order to derive the performing design for safety in design phase. For this purpose, a framework for safety impact assessment model using risk-based approach for construction projects is suggested. The suggested model includes of information survey and scenarios, classification of safety impact factors occurred by design and construction, and quantitative estimation of magnitude and frequency. Moreover, the checklist which is enable to identify relationship between safety impact factors and design factors is developed and the methodology of safety impact assessment model using risk-based approach is also proposed.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2012.03a
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• pp.104-104
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• 2012

아웃도어용 스포츠웨어 의류분야는 소비자들의 욕구가 기능성, 착용감, 패션성을 매우 중시하는 고감성, 고기능성 제품특성을 요구하고 있으며 이를 가장 충족시킬 수 있는 패션 트랜드로서 보온, 경량화 제품이 가장 급부상하고 있는 아이템이다. 경량성의 쾌적 스포츠 웨어에 사용되는 주요 합섬소재인 PET, Nylon을 이용하여 소재의 세섬화, 중공 소재를 통한 제품 개발이 대부분으로 보온, 경량, 속건 등 의복에서의 쾌적 기능성을 개선하기 위하여 개발되는 소재 및 제품의 경량화, 보온 및 흡한속 건성 부여를 통한 기능 요소와 신질감 발현의 촉감요소를 통한 차별화 된 제품개발이 요구되고 있다. 보온 기능성을 부여하는 기술로써 가장 일반적인 기술은 섬유 내부에 중공을 형성하여 경량성과 보온성을 동시에 가지는 기능성 원사 제조 기술과 섬유 내에 열에너지를 흡수할 수 있는 물질을 넣어 외부의 태양광을 섬유내로 흡수하여 열에너지로 전환, 축적함으로서 보온성을 향상시키는 방식이 있다. 주로 경량 보온의 동시 발현을 위하여 중공 형성을 통한 보온 소재 개발이 활발하게 일어나고 있는 실정이다. 가장 많은 수요를 차지하고 있는 경량 보온성 중공사의 경우, 강도 저하, 염색 불량 등의 공정 애로점이 발생하며, 제직 및 가공 공정 시 원사 내 중공이 찌그러짐이 발생하므로 완제품 제조 후에는 중공의 기능이 제대로 발현되지 못하는 문제가 발생한다. 또한 알칼리 또는 용제를 사용하여 후용출 하는 중공사의 경우, 공정이 복잡함은 물론 환경에 유해한 공정이다. 특히, 감량 후 직물의 인열강도는 감량 전과 비교하여 감소하게 되는데 이는 이용성 polymer가 용출되면서 생긴 중공에 의해 섬도가 감소되어 강도가 저하됨을 알 수 있다. 따라서 Sheath 부분에 최대한 손상을 주지 않으면서 Core 부분을 완전 용출 시킬 수 있는 감량 조건을 확보할 필요가 있다. 이에 보온성, 경량성의 기능을 극대화시키고, 중공률 유지하는 최적 용출 가공 조건을 확립하고자 연구하였다.

• Journal of Internet of Things and Convergence
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• v.5 no.2
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• pp.73-79
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• 2019

Research is underway on services and systems that provide real-time alerts for suffocating gases and potentially explosive materials, but currently smart bend type services are lacking. This study supports real-time identification of explosion hazards due to static electricity in the workplace and immediate elimination of accident occurrence factors, real-time monitoring of worker status and workplace hazards (oxygen, hazardous chemical concentration), and immediate warning and data in case of danger. We propose a method of establishing an accident prevention system through analysis. In this way, various accidents that may occur in industrial sites are monitored using IoT-based intelligent sensor nodes, wireless network technology, data processing middleware, and integrated control system, and real-time risk information at the industrial sites is prevented and accidents are prevented. By supporting a safe working environment, the company can significantly reduce costs compared to post-procurement costs.

• Composites Research
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• v.26 no.2
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• pp.105-110
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• 2013

In this study, we suggest the new floating PV generation structure which is improved the structural and economical efficiency compared with the system developed in the previous research. Pultruded FRP has superior physical and chemical material properties compared with those of conventional structural materials. Especially, pultruded FRP has an excellent corrosion-resistance, light-weight, and it also has high specific strength and stiffness which are highly appreciated for the design and fabrication of floating PV generation structure under harsh environmental condition. In this study, structural analysis using the finite element method has been performed to investigate the safety of new floating PV generation structure and newly applied structural members.