• 한국재난정보학회 논문집
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• 제20권1호
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• pp.106-116
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• 2024

연구목적: 본 논문은 건설 시공현장에서 발생하는 사고 및 잠재적 위험분석을 위한 IoT 및 CCTV 기반 안전모니터링을 실시하고 추락, 충돌 등 위험 또는 이상현상을 탐지하여 무전기 등을 이용한 예·경보 및 챗봇서비스를 구축하는 방법을 제시하는데 목적이 있다. 연구방법: 건설현장 스마트 건설기술 사례 및 문헌분석을 통하여 안전관리 모델을 제시한다. 연구결과: '건설사고 통계'에 따르면 2021년 건설업 사고재해자는 26,888명으로 전체 사고재해의 26.3%가 건설업에서 발생하였고, 건설업 안전사고 사망자는 417명으로 전체 산업재해 사망자의 50.5%에 달한다. 이런한 건설재해의 개선 방안으로, IoT 건전성모니터링 기반 스마트 건설기술을 활용한 건설현장 안전관리 AI 챗봇서비스를 제시한다. 근로자 등 이해관계자가 참여하는 건설현장은 비계공정 및 개구부, 위험기계기구류 접근 등 사업장 내부 주요 위험구역을 선정하여 인공지능 챗봇시스템을 구현하여 실증하였다. 결론: 건설현장 인공지능 챗봇서비스 실증결과에 대한 참여근로자의 만족도 조사에서 90점 이상을 받아 상업화 가능성을 확인하였다.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제17권4호
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• pp.7-14
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• 2011

This paper is intended to suggest some reference materials for future elderly housing design, especially smart home, in Korea, by reviewing the elements and applications of smart home concept for older adults in USA. Research method includes collecting materials by attending the regular SmartHome$^{(R)}$ part meeting, the navigation of related homepages, and the analysis of collected materials. Current researches in Korea look initial stage and show some general principles without practical concept & technologies of elderly facilities. SeniorSmart$^{(R)}$ Center in USA started on August 2007 with the 3 parts of SmartHOME$^{(R)}$, SmartWHEELS$^{(R)}$ and SmartBRAIN$^{(R)}$. The Center has been doing various multidisciplinary research projects but slowing down the planned processes due to national economic recession. The major researches of SmartHome$^{(R)}$ part can be summarized as follows; CS-PFP( Continuous Scale Physical Function Performance) laboratory is being in operation to help older adults and families make the difficult decision regarding the ability and safety to live independently. Three levels of necessary laboratories from uninhabited space to senior living environment were accommodated for field research. As core technologies of SmartHome$^{(R)}$, predicting & warning system of fall risk on recognizing gait signature patterns to identify any deviation from the normal patterns of the older adults, home monitoring system which will send alerts to a specified relative and/or health care professional when vital signs of the older adults will not be within normal parameters, and Mobility & Research Clinic for evaluating, treating the older adults & multidisciplinary research are under development. SmartHome$^{(R)}$ has made collaborative research agreements for field laboratory with various retirement communities and also is continuing to work for experimental software engineering with the Fraunhofer Institute, Germany.

• Environmental Engineering Research
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• 제11권5호
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• pp.277-284
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• 2006

The genetic toxicity of environmental pollutants, namely, nonylphenol (NP), bisphenol A (BPA) and chloropyriphos (CP) was investigated in aquatic sentinel species, freshwater crustacean, Daphnia magna, and larva of aquatic midge, Chironomus tentans, using Comet assay. Physiological effect of such pollutants was also investigated by studying the specimens' rates of reproduction, growth and survival. Acute toxicity results showed that, as expected, Daphnia was more sensitive than Chironomus to chemical exposure. The order of acute toxicity was CP > NP > BPA in D. magna and NP > CP > BPA in C. tentans. BPA may exert a genotoxic effect on D. magna and C. tentans, given that DNA strand breaks increased in both species exposed to this compound, whereas NP- and CP-induced DNA damage occurred only in C. tentans. In vivo genotoxic data obtained in aquatic sentinel species could provide valuable information for freshwater quality monitoring. The experiments with NP-exposed D. magna showed that the pollutant has long-term effects on reproduction, whereas no short-term effect on DNA integrity was found, being an example of a false-negative result from the biomarkers perspective. This result could be interpreted that other mechanism than genetic alteration might be involved in NP-induced reproduction failure in D. magna. False-positive results from the genotoxic biomarker obtained in BPA-exposed D. magna and in NP-exposed C. tentans make it difficult to use DNA integrity as an early warning biomarker. However, as the mere presence of genotoxic compounds, which are potentially carcinogenic, is of high concern to human and ecosystem health, it could also be important to rapidly and effectively detect genotoxic compounds in the aquatic system in ways that do not necessarily accompany a higher level of alteration. Considering the potential of D. magna and C. tentans as bioindicator species, and the importance of genotoxic biomarkers in ecotoxicity monitoring, DNA damage in these species could provide useful information for environmental risk assessment.

• 한국제4기학회지
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• 제17권2호
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• pp.47-54
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• 2003

Climate of Mongolia is a driven force on natural conditions as well as socio-economic development of the country. Due to the precariousness of climate conditions and traditional economic structure, natural disasters, specially disasters of meteorological and hydrological origin, have substantial effect upon the natural resources and socio-economic sectors of Mongolia. Mongolia's climate is characterized by high variability of weather parameters, and high frequency and magnitude of extreme climate and weather events. During the last few decades, climate of the country is changing significantly under the global warning. The annual mean air temperature for the whole territory of the country has increased by $1.56^{\circ}C$ during the last 60 years,. The winter temperature has increased by $1.56^{\circ}C$. These changes in temperature are spatially variable: winter warming is more pronounced in the high mountains and wide valleys between the mountains, and less so in the steppe and Gobi regions. There is a slight trend of increased precipitation during the last 60 years. The average precipitation rate is increased during 1940-1998 by 6%. This trend is not seasonally consistent: while summer precipitation increased by 11 %, spring precipitation decreased by 17. The climate change studies in Mongolia show that climate change will have a significant impact on natural resources such as water resources, natural rangeland, land use, snow cover, permafrost as well as major economic activities of arable farming, livestock, and society (i.e. human health, living standards, etc.) of Mongolia. Therefore, in new century, sustainable development of the country is defined by mitigating and adaptation policies of climate change. The objective of the presentation is to contribute one's idea in the how to reflect the changes in climate system and weather extreme events in the country's sustainable development concept.

• 한국사회복지학
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• 제66권3호
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• pp.5-28
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• 2014

본 연구는 학교결석 청소년을 대상으로 학교적응 유형을 분류하고, 각 유형에 영향을 미치는 예측요인을 개인, 가족, 또래 및 지역사회의 다양한 차원에서 살펴보고, 유형별 비행행동의 차이를 분석하는데 그 목적이 있다. 이를 위해 한국아동 청소년패널조사 자료를 활용하여 학교결석 중학생 477명을 대상으로 잠재프로파일분석을 실시하였고, 분류된 유형별 예측요인과 비행행동과의 관계를 알아보기 위해 다항로지스틱 분석과 분산분석을 실시하였다. 분석결과, 저적응, 중적응, 고적응 집단으로 분류되었으며, 유형별 예측요인과 비행행동에 통계적으로 유의미한 차이가 나타났다. 이는 학교결석 청소년이 다양하고 이질적인 집단으로 구성되었으며, 이것이 발달결과에 중요한 차이를 불러일으킬 수 있다는 사실을 경험적으로 증명한 것이다. 마지막으로 본 연구에서는 청소년 문제의 효과적인 예방을 위해 학교결석 청소년에 대한 차별화된 개입의 중요성을 제언하였다.

• 대한기계학회논문집A
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• 제40권8호
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• pp.721-724
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• 2016

실제 사용되는 기계 구조물의 수명 예측은 공정산포, 미래의 하중조건, 손상 모델의 불완전성 등으로 인하여 실험실에서 얻은 결과와 차이를 보일 수 밖에 없다. 본 연구에서는 이러한 불확실성이 내포된 기계 구조물의 피로파괴를 사전에 예지하기 위해 이중센서를 개발하고, 상온에서 단축 피로 하중을 받는 구조물에 적용하여 실증하였다. 이중 센서는 피로하중을 받는 대상 구조물보다 약간 더 큰 응력이 인가되도록 고안된 감지 구조물에 변형률 게이지를 부착한 형태이며, 균열이 센서자체에 먼저 발생함으로써 피로파괴를 예지하며, 쌍으로 제작된 감지부의 변형률 차를 이용하여 변동하중 하에서도 정상상태와 고장상태를 구분이 가능하다.

• 디지털융복합연구
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• 제14권2호
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• pp.217-225
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• 2016

본 연구에서는 배회가능성이 있는 치매환자의 실종예방을 위하여 웨어러블 디바이스(Wearable Device) 형식의 블루투스 비콘을 활용한 치매환자의 실내위치기반 모니터링시스템을 제안하였다. 이 시스템은 치매환자의 관리범위내 존재유무를 확인해 주며 치매환자가 비콘의 신호수신 설정거리를 이탈하면 즉, 지정된 관리구역을 벗어나면 비상메시지가 보호자와 관리자의 스마트 디바이스로 전달되는 시스템이다. 이 시스템의 주요 특성은 비콘을 착용한 치매환자를 특정장소에 설치된 비콘 신호수신용 스마트 기기(AP)에서 신호를 감지하여 환자의 위치를 파악하는 가역적 방법을 적용한 것이다. 본 논문에서 제안하는 블루투스 비콘을 활용한 실내위치기반 치매환자 모니터링 시스템은 요양병원, 재가요양시설 등에서 생활하는 배회가능성이 있는 치매환자의 실종예방에 기여하는 효과적 시스템으로 생각된다.

• 한국물환경학회지
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• 제24권5호
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• pp.598-602
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• 2008

The Daecheong Reservoir is the largest multi-purpose reservoir in the Keum River basin. This water supply is subject to some of the most serious taste and odor (T&O) problems in the region. The intensity of T&O events increased due to eutrophication during the 1990s. In this study, the temporal occurrence of T&O in raw water from the main Daecheong Reservoir and its regulating reservoir was compared using both an instrumental method (CLSA+GC/MS) and threshold odor number (TON) test from April to December 2006. In addition, biofilms on the submerged macrophytes and rocks were analyzed for two typical T&O causing compounds, Geosmin and 2-MIB. The maximum concentration of Geosmin in the main reservoir was almost two times higher than that in the regulating reservoir. Interestingly, 2-MIB was only detected in water samples from the main reservoir. In the case of T&O causing compounds present in the biofilm on the submerged macrophytes and rocks, the regulating reservoir had lower concentrations compared to those of the main reservoir. It was found that both Geosmin and 2-MIB were detected from the biofilms much earlier than from the water samples. This result suggests that the occurrence of T&O compounds in the biofilms could be used as an early warning indicator of an imminent T&O outbreak in the water body.

• Smart Structures and Systems
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• 제17권6호
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• pp.981-994
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• 2016

Two field research stations based upon atmospheric corrosivity monitoring combined with reinforced concrete corrosion rate sensors have been established in Kuwait. This was established for the purpose of remote monitoring of building materials performance for concrete under Kuwait atmospheric environment. The two field research sites for concrete have been based upon an outcome from a research investigation intended for monitoring the atmospheric corrosivity from weathering station distributed in eight areas, and in different regions in Kuwait. Data on corrosivity measurements are essential for the development of specification of an optimized corrosion resistance system for reinforced concrete manufactured products. This study aims to optimize, characterize, and utilize long-term concrete structural health monitoring through on line corrosion measurement and to determine the feasibility and viability of the integrated anode ladder corrosion sensors embedded in concrete. The atmospheric corrosivity categories supported with GSM remote data acquisition system from eight corrosion monitoring stations at different regions in Kuwait are being classified according to standard ISO 9223. The two nominated field sites where based upon time of wetness and bimetallic corrosion rate from atmospheric data where metals and rebar's concrete are likely to be used. Eight concrete blocks with embeddable anodic ladder corrosion sensors were placed in the atmospheric zone adjacent to the sea shore at KISR site. The anodic ladder corrosion rate sensors for concrete were installed to provide an early warning system on prediction of the corrosion propagation and on developing new insights on the long-term durability performance and repair of concrete structures to lower labor cost. The results show the atmospheric corrosivity data of the environment and the feasibility of data retrieval of the corrosion potential of concrete from the embeddable sets of anodic ladder corrosion sensors.

• 한국환경과학회지
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• 제24권8호
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• pp.993-1001
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• 2015

Comparing to the other air pollutants like $SO_2$, CO, the number of exceedance of the ozone national ambient air quality standard(NAAQS) and the ozone warning increased recently in Busan. The purpose of this study is to find out the preliminary symptoms for high ozone days in Busan area. In order to find out the preliminary symptoms, the hourly ozone data at air quality monitoring stations and the hourly meterological parameters at Busan regional meteorological 2007 to 2013 were used for the analysis. Averaged daily max ozone concentration was the highest(0.055 ppm) at Noksan and Youngsuri in the ozone season from 2007 to 2013. The horizontal distributions of daily max. ozone including all stations in Busan at high ozone days(the day exceeding 0.1 ppm of ozone concentration at least one station) were classified from two to five clusters by hierarchial cluster analysis. The meteorological variables showing strong correlation with daily max. ozone were the daily mean dew point temperature, averaged total insolation, the daily mean relative humidity and the daily mean cloud amount. And the most frequent levels were $19-23^{\circ}C$ in dew point temperature, $21-24 MJ/m^2$ in total insolation on the day before, $2.6-3.0 MJ/m^2$ on the very day, 67-80% in relative humidity and 0-3 in cloud amount.