• Proceedings of the KAIS Fall Conference
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• 2010.05b
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• pp.1115-1118
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• 2010

최근 실내공기질에 대한 관심이 높아지면서 실내공기질을 쾌적하게 유지하기 위한 다양한 기술에 대한 연구가 활발히 이루어지고 있다. 기존에는 미세먼지와 부유미생물 등이 가장 중요한 오염물질이었으나, 최근에는 이산화탄소가 크게 각광받고 있다. 이산화탄소는 그 자체가 환기의 지표이기도 하지만, 최근의 저탄소 녹색성장 기조에 따라 환기에 의한 냉난방 에너지 비용을 절감하는 방안에 대한 관심도 크게 높아지고 있다. 본 연구에서는 제올라이트를 이용하여 실내공간의 이산화탄소를 제어하는 방안에 대하여 기술하였다. 소형 lab-scale의 이산화탄소 흡착성능 평가시스템을 제작하고, 이를 이용하여 제올라이트의 이산화탄소의 흡착성능을 알아보았다. 또한, 본 시스템의 실용화를 위해서는 이산화탄소가 흡착한 제올라이트의 재생이 필요한데, 이를 위하여 다양한 온도와 압력 등의 조건 하에서 이산화탄소의 탈착성능을 TSA/PSA를 이용하여 알아보았다. 흡착실험을 통하여 제올라이트를 이용한 실내공간용 이산화탄소의 저감 효과를 확인할 수 있었다. 그러나, 탈착실험 결과 2~5회 정도 열탈착 시킨 후에는 이산화탄소의 흡착 성능이 현저하게 감소하여, 이를 개선하기 위한 방안의 개발이 필요함을 알 수 있었다.

• Transactions of the Korean Society of Automotive Engineers
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• v.8 no.3
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• pp.181-189
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• 2000

The aerodynamic characteristics of large transport vehicle has become more and more important in recent vehicle design to improve driving performance in high speed cruising and raise the product valve with regard to a comfortable driving condition. Hence, detailed knowledge of the flow field around truck coner vane is essential to improve fuel efficiency and reduce the dirt contamination on vehicle body surface. In this study, three-dimensional flow characteristics around corner vane attached to truck cabin were computed for the steady, incompressible, and high speed viscous flow, adopting the RNG k-$\varepsilon$ turbulence model. In order to investigate the influence of configuration and structure of corner vane, computations were carried out for four cases at a high Reynolds number, Re=4.1$\times$106 (based on the cabin height). The global flow patterns, drag coefficient and the distributions such as velocity magnitude, turbulent kinetic energy around the corner vane, were examined. As a result of this study, we could identify the flow characteristics around corner vane for the variation of corner vane length and width. Also, suggest the improved structure to reduce the dirt contamination in cabin side.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2017.11a
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• pp.755-755
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• 2017

공공분야에서의 지식생산이라는 국가 R&D사업의 본연의 임무에 사회문제해결이라는 보다 구체적인 요구가 커지고 있다. 취약계층, 노인, 장애인과 같은 사회적 약자들의 삶의 질 개선에 더불어 조류 인플루엔자, 미세먼지오염 등 국민생활에 영향을 주는 사회문제의 해결에 과학기술지식이 기여하라는 사회적 요청이 커지고 있다. 그동안 산업 지원과 학문 발전을 중심으로 발전해오던 국가R&D시스템이 이제는 공공분야에서의 지식생산시스템 격상이라는 과제를 안게 되었다. 정부는 2012년 '신과학기술 프로그램 추진전략(안)'을 통해서 이러한 요구를 수용하기 시작했으며 2014년에 다(多)부처 기획을 통해 11개 사업 분야를 선정하고 사회문제해결을 위한 R&D를 다(多)부처 사업으로서 2015년부터 시작하였다. 또한 과학기술정보통신부(구 미래부)는 단일 부처사업으로서 '사회문제해결형 사업' 을 2104년부터 추진하였다. 논문이나 특허보다는 현장문제의 해결책, 솔루션 생산을 목표로 제시하였으며 현장의 사용자나 시민이 연구개발의 전 과정에 참여하는 리빙랩이라는 새로운 방법론의 적용을 사회문제해결형 R&D사업의 성격으로 제안하였다. 본 연구는 사회문제해결형 R&D라는 이 새로운 시도가 국가R&D 시스템 안에서 어떻게 시행되었는지 NTIS data를 통해서 분석해보고자 한다. 먼저 다부처 기획으로 선정되어 추진된 과제들의 특성, 즉 연구적용분야, 연구 단계 등을 분석하고 단일부처 사업으로 수행된 '사회문제해결형 사업' 및 유사 단일부처 사업 과제들의 특성을 알아본다. 연구수행주체, 연구방법론 등 사회문제해결형 R&D 기획에서 제시한 새로운 방법들의 수행 여부를 알아보고 이를 통해 공공분야 국가R&D 시스템의 발전 및 사회문제해결형 R&D 사업의 향후 발전 방안을 제안한다.

• Annual Conference of KIPS
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• 2017.11a
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• pp.1179-1182
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• 2017

본 논문에서는 미세먼지를 포함하여 공기의 오염도를 측정하기 위해 폭넓게 활용되고 있는 광 산란 방식 센서의 정확도를 향상시키기 위하여, 초기 측정값에 적절한 보정 값을 추가하여 최종 결과를 구하는 방법을 제안한다. 기존 광 산란 방식의 센서는 휴대가 가능하고, 실시간으로 공기의 오염도를 측정할 수 있는 장점을 가지고 있으나, 그 정확도가 다소 낮다는 단점을 가지고 있었다. 제안시스템은 측정 범위를 확장할 수 있는 보정 값을 최종 측정값에 반영하고, 하드웨어적으로도 불필요한 외부 빛의 유입을 차단하는 설계를 적용하여 그 정확도를 높이고자 하였다. 또한, 측정된 결과를 사용자가 모바일 애플리케이션을 이용하여 손쉽게 확인할 수 있는 전체적인 시스템 구조를 설계하였다. 우리는 제안시스템의 평가를 위하여 프로토타입을 구현하여 주변 공기 오염도를 측정하였으며, 제안 방법의 적용 이전과 이후의 결과 비교를 통하여 시스템의 유효성을 확인하였다. 누구나 휴대할 수 있는 형태의 제품에 적용할 수 있는 기술이라는 점에서 앞으로 시스템의 활용범위는 무궁무진할 것으로 기대된다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2021.05a
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• pp.74-75
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• 2021

In the recent 2017 annual average fine dust concentration (PM2.5) statistics released by the Organization for Economic Cooperation and Development (OECD), Korea has a high concentration of 25.14㎍/m3, which is about twice the average of 12.5㎍/m3 in OECD countries. Fine dust (PM2.5) is the main source of secondary pollutant production by the reaction of primary pollutants emitted from automobiles and thermal power plants, mainly composed of sulfates, nitrates, and organic carbon. The permeable block is an eco-friendly product that prevents rainwater from collecting on the surface of the road because it does not penetrate the groundwater properly, and is widely constructed on sidewalks or parking lots to recharge groundwater in case of rain. In addition, the pavement of the permeable block is a fundamental solution to reduce pollution by preventing rainwater from flowing into the stream, and it also has the advantage of easy replacement as well as low replacement costs. Therefore, this study was a basic experiment to produce permeable blocks mixed with TiO2 and diatomite to improve indoor air quality, and intended to analyze the flexural strength and compressive strength of permeable blocks mixed with TiO2.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2021.05a
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• pp.189-190
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• 2021

Recently, the spread of intense social distancing and untact culture due to COVID-19 has increased the time spent indoors. In addition, according to the International Cancer Institute, fine dust was classified as a first-class carcinogen, a substance found to be carcinogenic, such as asbestos and benzene. As a result, interest in indoor air quality is increasing, and many studies are underway to reduce air pollutants. This study is a basic experiment of a board made to improve indoor air quality. The basic characteristics of the board, flexural strength and compressive strength, are analyzed and the results of the test are as follows. Experiments have shown that flexural strength and compressive strength tend to decrease as the replacement rate of hydrocarbons increases. It is believed that the strength of the sludge has decreased due to the increase in internal voids due to the increase in non-surface area, volume and diameter of microfiber as it undergoes the carbonation process. In addition, it is believed that the amount of moisture needed for curing during the mixing process was reduced due to the absorption of hydrocarbons.

• Proceedings of the Korean Society of Computer Information Conference
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• 2024.01a
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• pp.131-134
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• 2024

본 논문에서는 기존 철도 운영 및 관리시에 철도 주변환경으로 부터 발생하는 소음, 진동, 미세먼지 센서에서 다양한 실시간 스트림 데이터를 감지하고 정형화된된 데이터 패턴을 인식하고 분석할 수 있도록 데이터를 구성 및 저장하고 분석된 데이터를 표현할 수 있도록 시각화 지원을 위한 모니터링 시스템 플랫폼을 구현하였다. 데이터 전송을 위해 시리얼 통신 기법을 주로 적용하였으나, 센서와 디바이스의 증가로 인해 시리얼 통신의 한계가 나타났다. 따라서, 본 연구에서는 기존의 아두이노와 서버 간의 직접 통신 방식 대신 라즈베리파이를 도입하여 MQTT Broker(브로커)를 설치하고 통신을 진행하였다. 철도 데이터 모니터링 시스템 플랫폼은 NoSQL 데이터베이스인 MonGoDB와 데이터 시각화할 수 있는 Grafana를 이용하여 구축하였다.

• Korea Science and Art Forum
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• v.37 no.4
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• pp.297-308
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• 2019

Air pollution due to the fine dust level updating every day, and the problem of indoor air pollution due to ventilation difficulties and indoor discharge pollutants is also serious. In order to improve the indoor air quality, the air purification effect using the plants is prominent. In this study was started to investigated the living environment of modern people, the risk of indoor air pollution and the improvement function of plants, and to activate plant application. The purpose of this study is to analyze the main functions and design status of domestic and overseas plant - related applications, and to understand the actual use of modern plant applications and to help them learn more convenient plant - related knowledge. Therefore, this paper attempted to establish a basis for suggesting a new plant application by conducting a survey on the health effects of indoor air pollution and user awareness of plant - related applications. The results and contents of the study are as follows. First, as a theoretical review, indoor air pollution is more dangerous to modern people who have a high proportion of indoor living time and adversely affects their health. In order to solve such a problem, it has been shown that air conditioning and stress reduction can be effectively achieved by placing plants in the indoor space. Second, the analysis of the previous study shows the risk of indoor air pollution and its adverse effects on health. In addition, I have been able to find some researches related to the improvement of the indoor air by using the air purifying plants, and I can see the improvement of the user's behavior through the development or improvement of the application. Third, as a result of the survey on the status of domestic and overseas plant application, the main function of the application having high installation number was watering notification, provision of basic information of plants, and most of the functions were plant discerment through cameras. Fourth, most of the survey respondents have either raised or raised plants. Those who have little experience with plant applications have also shown positive feedback in the future on the use of plant-related applications. In addition, due to social problems such as air pollution, air purification using plants and functional plants showed high interest. Based on these results, we propose the need for a multi-functional plant application that can improve the indoor air pollution and facilitate the provision of information related to it.

• Journal of Korean Society of Environmental Engineers
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• v.36 no.1
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• pp.20-28
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• 2014

The three air quality monitoring sites, analysed simultaneously PM-10 and PM-2.5, ie. Ihyeondong in industrial area, Manchondong in residential area, Pyeongnidong in streetside, among 13 air quality monitoring sites in Daegu area, were investigated the concentration distribution characteristics of PM-2.5 and PM-10 in the last 2 years (2011~2012). PM-10 concentrations exceeded annual average reference value ($50{\mu}g/m^3$) in Ihyeondong ($52.5{\mu}g/m^3$) and Pyeongnidong ($60.9{\mu}g/m^3$) but satisfied in Manchondong ($44.9{\mu}g/m^3$). All PM-2.5 concentrations exceeded EPA annual standard value of the United States ($15{\mu}g/m^3$) in three points, but also exceeded new control annual standard value ($25{\mu}g/m^3$) coming into effect in 2015. Seasonal concentration of PM-10 appeared the order of spring > winter > fall > summer, and in the case of PM-2.5, the order was winter > spring > fall > summer. Monthly concentrations of PM-10 and PM-2.5 were highest in February and lowest in September. Diurnal concentrations of PM-10 and PM-2.5 increased from 7:00 AM, and recorded the highest concentration between 10:00 AM and 11:00 AM. And after 6:00 PM it lowered continuously and tended to show fixed concentrations from evening until early morning. In addition, the concentration of fine particles during the week was higher than the weekend. The fluctuation in industrial area was larger than the residential area. At the PM-2.5/PM-10 ratio, summer was generally high, spring was the lowest. And, when yellow sand occurred, it was 0.32 to 0.42. It was very low compared to 0.54 to 0.64 during non-yellow sand times. This paper for the state and the characteristics of Daegu' fine particles (PM-10, PM-2.5) will be valuable to future researches of fine particles and air pollution management.

• Horticultural Science & Technology
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• v.33 no.4
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• pp.605-617
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• 2015

The ultimate goal of this research is to develop a botanical biofiltration system that combines a green interior, biofiltering, and automatic irrigation to purify indoor air pollutants according to indoor space and the size of biofilter. This study was performed to compare the stability of air flow characteristics and removal efficiency (RE) of fine dust within a wall-typed (vertical) botanical biofilter depending on humidifying cycle and to investigate RE of volatile organic compounds (VOCs) by the biofilter. The biofilter used in this experiment was designed as an integral form of water metering pump, water tank, blower, humidifier, and multi-level planting space in order to be suitable for indoor space utilization. As a result, relative humidity, air temperature, and soil moisture content (SMC) within the biofilter showed stable values regardless of three different humidifying cycles operated by the metering pump. In particular, SMCs were consistently maintained in the range of 27.1-29.7% during all humidifying cycles; moreover, a humidifying cycle of operating for 15 min and pausing for 45 min showed the best horizontal linear regression (y = 0.0008x + 29.09) on SMC ($29.0{\pm}0.2%$) during 120 hour. REs for number of fine dust (PM10) and ultra-fine dust (PM2.5) particles passed through the biofilter were in the range of 82.7-89.7% and 65.4-73.0%, respectively. RE for weight of PM10 passed through the biofilter was in the range of 58.1-78.9%, depending on humidifying cycle. REs of xylene, ethyl benzene, total VOCs (TVOCs), and toluene passed through the biofilter were in the range of 71.3-75.5%, while REs of benzene and formaldehyde (HCHO) passed through the biofilter were 39.7% and 44.9%, respectively. Hence, it was confirmed that the wall-typed botanical biofilter suitable for indoor plants was very effective for indoor air purification.