• Journal of Preventive Medicine and Public Health
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• 제55권3호
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• pp.273-279
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• 2022

Objectives: The aim of this study was to present the baseline results of a pilot project conducted to evaluate the effectiveness of lung cancer screening using low-dose chest computed tomography (CT) in regions with excessive radon levels in the Republic of Kazakhstan. Methods: In total, 3671 participants were screened by low-dose chest CT. Current, former, and never-smokers who resided in regions with elevated levels of radon in drinking water sources and indoor air, aged between 40 and 75 with no history of any cancer, and weighing less than 140 kg were included in the study. All lung nodules were categorized according to the American College of Radiology Lung Imaging Reporting and Data System (Lung-RADS 1.0). Results: Overall, 614 (16.7%) participants had positive baseline CT findings (Lung-RADS categories 3 and 4). Seventy-four cancers were detected, yielding an overall cancer detection rate of 2.0%, with 10.8% (8/74) stage I and a predominance of stage III (59.4%; 44/74). Women never-smokers and men current smokers had the highest cancer detection rates, at 2.9% (12/412) and 6.1% (12/196), respectively. Compared to never-smokers, higher odds ratios (ORs) of lung cancer detection were found in smokers (OR,2.48; 95% confidence interval [CI], 1.52 to 4.05, p<0.001) and former smokers (OR, 2.32; 95% CI, 1.06 to 5.06, p=0.003). The most common histologic type of cancer was adenocarcinoma (58.1%). Conclusions: Implementation of low-dose CT screening for lung cancer in regions with elevated radon levels is an effective method for both smokers and never-smokers.

• 한국정보교육학회:학술대회논문집
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• 한국정보교육학회 2021년도 학술논문집
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• pp.303-308
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• 2021

본 연구에서는 학교 현장에서 매우 중요하지만 변화가 필요하다고 생각되는 안전 교육과 소프트웨어 교육을 융합한 수업 설계안을 제시하고자 하였다. 간접 체험 중심의 안전 교육 실현을 위해 비트브릭이라는 피지컬 컴퓨팅 도구를 활용하여 '스마트 안전 통학로 제작 프로젝트'로 12차시의 수업안을 구상하였다. 12차시의 수업안을 바탕으로 총 5인의 교사에게 인터뷰로 질적 연구를 한 결과, 수업에 적용했을 때의 효과성과 문제점이 모두 나타났다. 효과성은 기존의 전달식 안전 교육과는 달리 실제 상황을 중심으로 한 간접 체험 중심의 안전 교육이 가능하고 자유도가 높은 수업으로 흥미 유발과 함께 절차적 사고 능력이 발달 될 수 있음을 기대할 수 있다는 점이다. 그러나 직접 상황을 구현하는 과정이 어려울 수 있고 모둠 활동보다는 짝 활동이 효율적일 수 있다는 문제점이 나타났다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2022년도 학술발표회
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• pp.214-214
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• 2022

감포댐은 2006년 준공하여 각종 시설 및 설비의 노후화가 진행중에 있으며, 최근 감포댐 인근 지역에서 발생한 경주지진(규모 5.8) 및 포항지진(규모 5.4)이 발생하여 지진시 시설물의 안전성에 대해 중요성이 대두되고 있었다. 이에 감포댐 안전성강화 사업을 추진하게 되었고, 주요 사업내용은 취수탑 관리교 내진보강, 댐체 심벽보강을 통한 댐체 안전성확보, 비상방류시설 개선이다. 취수탑 관리교는 교각단면의 변위연성도 및 교량받침에 의한 구조물 안전성 평가를 시행하였고, 단면강도는 모멘트-곡률해석법에서 탄성영역의 단면강도 대비 탄성지진력을 비교하여 안전성을 검토하였다. 검토결과 교량받침의 내진성능은 부족한 것으로 검토되어 유량제어형 멀티펌프와 안전잭을 이용한 변위제어 방식의 교량동시 인상공법이 가능하고 인상정밀도 ±0.5mm이내의 성능을 가진 교량인상공법 적용하여 보강을 하는 것으로 계획하였다. 댐체 심벽보강을 위해 먼저 전기비저항탐사를 수행하여 전기비저항대를 탐사하여 심벽부에서 포화대가 형성된 부위를 조사하였다. 그리고 댐 상·하류에 전극을 설치하고 전류를 발생시켜 측정 지점별 자기장을 측정을 통하여 댐체내 침투에 따른 유로 형성여부 파악을 위한 전자기장탐사를 시행하였다. 마지막으로 심벽 시추조사를 시행하여 공내수를 조사하였다. 조사결과 포화대의 위치 및 이상대가 다양한 것으로 나타났으며, 이는 불특정 지점에 연약대가 존재한다 판단하여 심벽부 보강계획을 전반적으로 적용하는 것으로 결정하였다. 비상방류시설은 최근 15년 실측자료의 홍수기(6~9월) 평균유입량을 적용하여 검토하였으며 검토결과 배제대상 높이 75%까지는 3.7일, 완전배제까지는 11.2일이 걸려 댐설계기준을 충족하는 것으로 검토되다. 다만 감포댐 비상방류시설이 하천제방과 직각방향으로 형성되어 있고, 하천의 폭이 좁아 과거 방류시에도 제방을 월류하는 것으로 조사되어 하천의 세굴을 방지하고 제방 안전성을 확보하기 위하여 비상방류시설에 감세공을 설치하고, 제방에 디플렉터 옹벽을 설치하는 것으로 계획하였다. 감세공은 2번에 걸친 감세효과로 방류시 하류바닥 및 옹벽 보호 효과가 큰 미국 USBR의 TypeVI를 적용하였으며, Flow-3D 모델링을 통하여 제방에 월류가 발생하지 않는 최적의 대안 옹벽규모를 산정하였다.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.119-127
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• 2022

Most of the construction works are conducted outdoors, so the construction workers are affected by weather conditions such as temperature, humidity, and wind velocity which can be evaluated the thermal comfort as environmental factors. In our previous researches, it was found that construction accidents are usually occurred in the discomfort ranges. The safety management, therefore, should be planned in consideration of the thermal comfort and measured by a specialized simulation tool. However, it is very complex, time-consuming, and difficult to model. To address this issue, this study is aimed to develop a framework of a prediction model for improving the prediction accuracy about outdoor thermal comfort considering environmental factors using machine learning algorithms with hyperparameter tuning. This study is done in four steps: i) Establishment of database, ii) Selection of variables to develop prediction model, iii) Development of prediction model; iv) Conducting of hyperparameter tuning. The tree type algorithm is used to develop the prediction model. The results of this study are as follows. First, considering three variables related to environmental factor, the prediction accuracy was 85.74%. Second, the prediction accuracy was 86.55% when considering four environmental factors. Third, after conducting hyperparameter tuning, the prediction accuracy was increased up to 87.28%. This study has several contributions. First, using this prediction model, the thermal comfort can be calculated easily and quickly. Second, using this prediction model, the safety management can be utilized to manage the construction accident considering weather conditions.

• 국제학술발표논문집
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• The 8th International Conference on Construction Engineering and Project Management
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• pp.237-242
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• 2020

Construction noise is among the most critical stressors that adversely affect the quality of life of the people residing near construction sites. Many countries strictly regulate construction noise based on sound pressure levels, as well as timeslots and type of construction equipment. However, individuals react differently to noise, and their tolerance to noise levels varies, which should be considered when regulating construction noise. Although studies have attempted to analyze individuals' stress responses to construction noise, the lack of quantitative methods to measure stress has limited our understanding of individuals' stress responses to noise. Therefore, the authors proposed a quantitative stress measurement framework with a wearable electroencephalogram (EEG) sensor to decipher human brain wave patterns caused by diverse construction stressors (e.g., worksite hazards). This present study extends this framework to investigate the feasibility of using the wearable EEG sensor to measure individuals' emotional stress responses to construction noise in a laboratory setting. EEG data were collected from three subjects exposed to different construction noises (e.g., tonal vs. impulsive noises, different sound pressure levels) recorded at real construction sites. Simultaneously, the subjects' perceived stress levels against these noises were measured. The results indicate that the wearable EEG sensor can help understand diverse individuals' stress responses to nearby construction noises. This research provides a more quantitative means for measuring the impact of the noise generated at a construction site on neighboring communities, which can help frame more reasonable construction noise regulations that consider various types of residents in urban areas.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.54-55
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• 2015

Increase of impervious areas due to expansion of housing area, commercial and business building of urban is resulting in property change of stormwater runoff. Also, rapid urbanization and heavy rain due to climate change lead to urban flood and debris flow damage. In 2010 and 2011, Seoul had experienced shocking flooding damages by heavy rain. All these have led to increased interest in applying LID and decentralized rainwater management as a means of urban hydrologic cycle restoration and Natural Disaster Prevention such as flooding and so on. Urban development is a cause of expansion of impervious area. It reduces infiltration of rain water and may increase runoff volume from storms. Low Impact Development (LID) methods is to mimic the predevelopment site hydrology by using site design techniques that store, infiltrate, evaporate, detain runoff, and reduction flooding. Use of these techniques helps to reduce off-site runoff and ensure adequate groundwater recharge. The contents of this paper include a hydrologic analysis on a site and an evaluation of flooding reduction effect of LID practice facilities planned on the site. The region of this Case study is LID Rainwater Management Demonstration District in A-new town and P-new town, Korea. LID Practice facilities were designed on the area of rainwater management demonstration district in new town. We performed analysis of reduction effect about flood discharge. SWMM5 has been developed as a model to analyze the hydrologic impacts of LID facilities. For this study, we used weather data for around 38 years from January 1973 to August 2014 collected from the new town City Observatory near the district. Using the weather data, we performed continuous simulation of urban runoff in order to analyze impacts on the Stream from the development of the district and the installation of LID facilities. This is a new approach to stormwater management system which is different from existing end-of-pipe type management system. We suggest that LID should be discussed as a efficient method of urban disasters and climate change control in future land use, sewer and stormwater management planning.

• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.390-390
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• 2013

Use of recycled aggregates in portland cement concrete construction can offer benefits associated with both economy and sustainability. Testing performed to date indicates that RBMA can be used as a 100% replacement for conventional coarse aggregate in concrete that exhibits acceptable mechanical properties for use in structural and pavement elements, including satisfactory performance in some durability tests. RBMAC is currently not used in any type of construction in the United States. However, use of RBMAC could become a viable construction strategy as sustainable building practices become the norm. Rating systems such as LEED offer points for reuse of building materials (particularly on-site) and use of recycled materials. If renovations at an existing facility call for the demolition of existing brick masonry constructions, the rubble could be included as RBMA in new concrete pavement, sidewalks, or curb and gutter. Other potential uses for RBMAC could include those in the precast concrete industry, particularly in architectural precast concrete applications. In addition to providing acceptable strength and economy, the color of RBMA could be an attractive component of architectural precast concrete panels or other façade components. This paper explores the feasibility of use of RBMAC in several types of sustainable construction initiatives, based upon the findings of previous work with RBMAC produced from construction and demolition waste from a case study site. Guidance for obtaining and using RBMA is presented, along with a summary of material properties of RBMAC that will be useful to construction professionals.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.1256-1263
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• 2022

With the advent of the Fourth Industrial Revolution, the amount of energy used in buildings has been increasing due to changes in the energy use structure caused by the massive spread of information-oriented equipment, climate change and greenhouse gas emissions. For the efficient use of energy, it is necessary to have a plan that can predict and reduce the amount of energy use according to the type of energy source and the use of buildings. To address such issues, this study presents a model embedded in a digital twin that predicts energy use in buildings. The digital twin is a system that can support a solution of urban problems through the process of simulations and analyses based on the data collected via sensors in real-time. To develop the energy use prediction model, energy-related data such as actual room use, power use and gas use were collected. Factors that significantly affect energy use were identified through a correlation analysis and multiple regression analysis based on the collected data. The proof-of-concept prototype was developed with an exhibition facility for performance evaluation and validation. The test results confirm that the error rate of the energy consumption prediction model decreases, and the prediction performance improves as the data is accumulated by comparing the error rates of the model. The energy use prediction model thus predicts future energy use and supports formulating a systematic energy management plan in consideration of characteristics of building spaces such as the purpose and the occupancy time of each room. It is suggested to collect and analyze data from other facilities in the future to develop a general-purpose energy use prediction model.

• 문화기술의 융합
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• 제9권6호
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• pp.49-56
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• 2023

본 연구의 목적은 다양한 전공 학생들이 한 그룹을 형성하여 지역사회에 봉사할 수 있는 수업으로서 현재 당면한 지역 문제 관련 수행과제를 선정하여 융합전공수행 기반으로 해결하는 융합전공수행 기반 수업(convergence major based learning, CMBL)을 개발하고 이에 적합한 교수 학습모델을 구축하는 데 있다. 우리는 융합 전공역량에 관한 전반적인 문제해결 역량을 배양하기 위해 지역의 실질적인 문제를 찾고 해결하는 팀 프로젝트형 수업 형태를 지닌 CMBL 수업을 개발하였다. 그리고, 본 수업을 위해서 교수자는 지역사회의 현장을 탐색하여 연결해주는 교두보 같은 역할을 수행하고 학생들은 연결된 기관들을 직접 방문하여 현장 관찰, 질적 인터뷰 등을 통해 대상자에 대한 이해와 공감을 기반으로 그들에게 절실한 문제들을 찾아내고 본인의 전공적인 역량을 최대한 발휘하여 직접 해결하는데 필요한 CMBL 수업 교수학습 모델을 개발하였다. 따라서, 우리는 다양한 전공을 가진 학생들이 한 그룹을 형성하여 지역사회의 현실적인 문제해결의 역량을 배양하여 지역사회가 요구하는 대학융합교육의 미래지향적 방향을 제시하고자 한다.

• 산업융합연구
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• 제21권9호
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• pp.133-142
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• 2023

농촌인구 감소, 고령화 심화, 기후변화 등으로 지속적으로 악화되고 있는 한국농업의 생산여건 변화에 효과적으로 대응하기 위해 디지털 정보기술 활용이 중요해졌다. 이에 본 연구는 성향점수매칭법을 이용하여 농가의 정보화 기기 활용 선택에 미치는 요인과 정보화 기기 활용이 농산물 판매에 미치는 효과를 분석하였다. 분석 결과, 연령이 낮은 농가, 교육수준이 높은 농가, 선도농가들이 정보화 기기 활용 채택 가능성이 높은 것으로 나타났다. 연령, 경영규모, 영농형태 등 유사한 특성을 가진 농가라면 농업경영에 정보화 기기를 활용하는 농가가 더 높은 농산물 판매 수입을 올리는 것이 확인되었다. 따라서 농가의 정보화 기기의 활용능력을 높이는 것은 농가소득을 향상시킬 수 있다는 시사점을 제공한다. 정보화 기기 보급 및 농업정보를 활용할 수 있는 능력을 농가들이 가질 수 있도록 정부의 농업·농촌 분야 정보화 지원 사업이 중요하다 할 수 있으며, 정보 기술에 근거한 과학적 영농 및 마케팅 활동이 이루어질 수 있는 정보 인프라 구축에도 적극적인 투자가 이루어져야 할 것이다.