• 환경생물
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• 제35권2호
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• pp.143-151
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• 2017

본 연구는 부산시의 대표적인 도시하천인 온천천에서 가뭄 및 집중호우 등 환경적 교란이 수질 및 부착규조류 군집에 미치는 영향을 파악하기 위하여 2013년~2014년 2년간 연구를 수행하였다. 긴 갈수기였던 2013년 4분기~2014년 1분기와 2014년 3분기에 강한 집중 호우 사이에 급격한 하천 수질 변화를 보였다. 부착규조류는 비교적 짧은 유하거리에 비해 도심화 정도에 따라 상류에서 하류까지 뚜렷하게 군집 구조 변화를 보였으나 긴 가뭄기간 동안 감소된 유량은 종조성에 영향을 주어 Cocconeis placentula var. lineata에서 Gomphonema clevei이 우점종으로 바뀌고 Gomphonema 속 등 주요 분포 종으로 조사되었다. 갈수기 이후 강한 강우로 부착규조류의 종조성보다 생물량이 급격하게 감소되었고 이는 국지적 기후 변화로 수생태계 구조와 기능에 많은 영향이 생김을 알 수 있었다. 따라서, 기후 변화에 의한 도시기후의 이상현상과 도시하천의 수질 및 부착규조류의 분포 특성 연구는 도시하천 생태계 특성과 변화 연구에 있어서 기초 자료로 활용될 수 있을 것으로 기대하며 국지적인 환경변화에 대응하는 도시하천의 유지관리 방안을 찾는 데 도움이 될 것으로 판단된다.

• 한국인터넷방송통신학회논문지
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• 제15권6호
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• pp.135-140
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• 2015

CPS는 다양한 임베디드 시스템들을 복합적으로 모델링 및 시뮬레이션 한다. 이때 다양한 종류의 모델이 사용되기 때문에 시뮬레이션에 사용되는 데이터들에 대한 체계적인 관리 위해 SEDRIS를 적용한다. SEDRIS는 특정 도메인 환경에서 개발된 환경데이터들을 재사용 및 상호운영 가능하기 때문에 비용과 시간을 절감할 수 있다. 기존 시뮬레이터와 SEDRIS를 연동 위해, 시뮬레이터의 지형 표현에 사용되는 높이맵을 SEDRIS의 레스터 데이터 표현방법으로 변환하여 입력만이 가능하다. 이 문제를 해결위해, 높이맵 표현을 위해 사용되는 RAW파일을 폴리곤 데이터로 변환하는 방법을 제안한다. 제안한 방법은 두 가지 이점을 제공한다. 첫 번째로 SEDRIS 내부에 환경데이터 표현이 가능해진다. 두 번째는 그림파일처럼 보이는 지형을 뷰어로 확인 가능하다. 즉, SEDRIS 비전문가도 지형 환경 데이터를 구축이 가능하다.

• 한국한의학연구원논문집
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• 제14권3호
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• pp.113-119
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• 2008

In pulse diagnosis, the indentation pressure is one of the most important factors as well as the change of pulse shape and the distribution of pressure via time. But, on the oriental medical doctor's indentation pressure control, the understandings of the neurophysiological meanings and mechanisms have been lacked. So, in this paper, we considered on these issues and then proposed a proper system which can imitate the OMD's indentation pressure control mechanisms. As a result, both tactile information and kinesthetic information were found to be essential to the indentation pressure control so that a system, which can measure both the physical indent pressure and the displacement of an indentation arm, has been proposed. With this proposed system, while the indentation was being controlled through the moving step number of the step motor, the physical indentation pres sure and displacement of the indentation arm were measured. From these measured data, the relationships between the moving step number and both physical indentation pressure and displacement were revealed to have linear characteristics in early phase and to have nonlinear characteristics in latter phase. Additionally, three types of graph were generated whose X axis means the moving step number, the physical indentation pressure and the displacement respectively and Y axis means the pulse pressure. By comparing these graphs, we come to conclude that different concepts on indentation pressure control cause different diagnostic results on floating/sinking degrees for the same subject. Consequently, an indentation system for the pulse diagnosis should be able to provide both the tactile information and kinesthetic information, that is, the physical indentation pressure and the displacement of the indentation arm. In future, the proposed system should be optimized to the pulse diagnosis environment and how to combine the both information for more reliable diagnosis should be studied.

• 웰빙융합연구
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• 제5권4호
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• pp.19-31
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• 2022

Purpose: This study was conducted to identify indoor air quality in various living spaces using sensors that can measure noise, vibration, fine dust, and odor in real time and to propose optimal indoor air quality maintenance management using Internet of Things(IoT). Research design, data and methodology: Using real-time sensors to monitor physical factors and environmental air pollutants that affect the comfort of the residential environment, Noise, Vibration, Atmospheric Pressure, Blue Light, Formaldehyde, Hydrogen Sulfide, Illumination, Temperature, Ozone, PM10, Aldehyde, Amine, LVOCs and TVOCs were measured. It were measured every 1 seconds from 4 offices and 4 stores on a small scale from November 2018 to January 2019. Results: The difference between illuminance and blue light for each measuring point was found to depend on lighting time, and the ratio of blue light in total illumination was 0.358 ~ 0.393. Formaldehyde and hydrogen sulphide were found to be higher than those that temporarily attract people in an indoor office space that is constantly active, requiring office air ventilation. The noise was found to be 50dB higher than the office WHO recommendation noise level of 35 ~ 40dB. The most important factors for indoor environmental quality were temperature> humidity> illumination> blue light in turn. Conclusions: Various factors that determine the comfort of indoor living space can be measured with real-time sensors. Further, it is judged that the use of IoT can help maintain indoor air quality comfortably.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
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• pp.884-893
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• 2008

The purpose of this case study is cut-slope stability in pyroclastic-rock area. Pyroclastic-rock is very vulerable by Chemical and physical weathering. And risk increase of Pyroclastic-rock proportional to exposure time. This case of cut-slope located in Jeollabuk-do Jinan-gun and reserch order is topography character research, geological character research, field survey, measure method presentation.

• 한국항행학회논문지
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• 제16권1호
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• pp.82-88
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• 2012

최근 소셜 네트워크 서비스(Social Network Service, SNS)에 대한 사회적 인식과 관심이 높아지면서 이것이 미치는 사회적 영향과 파장에 대한 연구와 이를 이용한 다양한 전략들이 속속 등장하고 있다. 본 논문에서는 다양한 센서를 사용할 수 있는 피지컬 컴퓨팅 환경에서의 SNS와의 연동 방법을 구성하고 그 중 오픈소스 환경인 아두이노와 다양한 센서들을 Open API를 제공하는 트위터와의 연동을 통해 의사표현에 제약이 있는 장애인들을 위해 이 기술이 사용될 수 있음을 제안하였다. 각종 센서에서 받아오는 값을 이용해 트위터와 연동을 하여 메시지를 전송하는 방식으로 구성하였다.

• KIEAE Journal
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• 제15권5호
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• pp.95-105
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• 2015

Purpose: This paper presents a framework development for BIM (Building Information Modeling)-based OOPM (Object-Oriented Physical Modeling) for Building Thermal Simulation. The framework facilitates decision-making in the design process by integrating two object-oriented modeling approaches (BIM and OOPM) and efficiently providing object-based thermal simulation results into the BIM environment. Method: The framework consists of a system interface between BIM and OOPM-based building energy modeling (BEM) and the visualization of simulation results for building designers. The interface enables a BIM models to be translated into OOPM-based BEM automatically and the thermal simulation from the created BEM model immediately. The visualization module enables the simulation results to be presented in BIM for building designers to comprehend the relationships between design decisions and the building performances. For the framework implementation, we utilized the Modelica Buildings Library developed by the Lawrence Berkeley National Laboratory as a thermal simulation solver. We also conducted an experiment to validate the framework simulation results and demonstrate our framework. Result: This paper demonstrates a new methodology to integrate BIM and OOPM-based BEM for building thermal simulation, which enables an automatic translation BIM into OOPM-based BEM with high efficiency and accuracy.

• 폴리머
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• 제38권4호
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• pp.457-463
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• 2014

본 연구에서는 다양한 환경에서 방사선 조사된 불소고분자 필름(PTFE, FEP, PFA, PVDF 및 ETFE)들의 화학 구조 및 물성 변화를 관찰하였다. 방사선은 $Co^{60}$ 감마선을 사용하였으며, 공기 분위기와 질소 분위기 및 진공 상태에서 조사하였다. 방사선 조사된 불소고분자 필름의 FTIR 분석을 통하여 방사선에 의해 생성된 라디칼이 공기 중 산소와 반응하여 산화반응이 진행되었음을 확인하였다. 또한 DSC를 이용하여 방사선 조사에 의해 변화되는 불소고 분자의 용융열 및 결정화도를 관찰하여 고분자 구조에 따른 절단 및 가교반응을 확인하였다. 인장 강도 실험을 통하여 방사선 조사 환경에 따른 불소고분자의 물성 변화를 관찰한 결과 공기 분위기에서 조사된 불소고분자 필름들의 기계적 물성이 현저히 떨어지는 것을 관찰하였다.

• 한국환경과학회지
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• 제29권3호
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• pp.273-282
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• 2020

Residence time is defined as the time taken for a material in a system to leave the system. The residence time characteristics in shellfish aquaculture determine the dispersion of excretion from aquaculture farms, along with the supply of food by seawater exchange. In this study, we estimated the spatial distribution of average residence time in the shellfish farming area using a particle tracking model. As a result, a relatively short average residence time of about 20 days or less was calculated in most areas, but an average residence time of more than 40 days was calculated in the inner areas. Relatively long average residence times were calculated along the west coast compared to the east coast, with the longest average residence time of more than 50 days in the northwestern areas. It can be inferred that the disturbance of the benthic ecosystem caused by shellfish farms is likely to be large because of the relatively weak dispersion of excrement from shellfish farms located on the west coast, especially in the northwest region. This distribution of average residence time is important for understanding the potential effects of seawater exchange on the environmental sustainability of shellfish farms, along with the seawater circulation characteristics of Jaran Bay.

• 한국학교보건학회지
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• 제35권3호
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• pp.143-151
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• 2022

Purpose: The purpose of this study was to examine the effects of being aware of the physical and psychosocial environment of the school on subjective feeling of happiness in Korean middle and high school students. Methods: The data of "Health and lifestyle Survey (2019)" conducted by the National Youth Policy Institute were analyzed after receiving approval though the website. A total of 5,311 middle and high school students were included in the analysis. Descriptive statistics, t-test, one-way ANOVA, pearson correlation, and multiple regression analysis were executed using SAS 9.4. Results: The mean score of subjective feeling of happiness was 6.92±0.56 out of 10. From the univariate analysis, the more positive the perception of the physical school environment was, such as classrooms, restrooms, exercise facilities, catering facilities, health facilities, other school facilities and school uniform, the higher the subjective feeling of happiness was (p for all <.001). In addition, the psychosocial environment of the school was significantly related to the happiness of adolescents (p<.001). After controlling for gender, school level, school grade, socio-economic status, and stress, positive perception of classrooms (B=0.04, p<.001), catering facilities (B=0.01, p=.021), health facilities (B=0.08, p<.001), and the psychosocial environment of the school (B=0.18, p<.001) was significantly associated with happiness of the students. Conclusion: Positive perception of the school environment was found to increase happiness in adolescents. Therefore, efforts should be made to make classrooms, catering facilities, and health facilities a pleasant space as well as to create a school atmosphere that values health.