• 환경영향평가
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• 제9권4호
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• pp.257-269
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• 2000

This study is to investigate the methodology and applicability on emission control by both MECHANICAL Model and Fugitive Dust Model (FDM) through the comparison of field measurement data and calculated data. Comparing to the method of AP-42 emission fector on the production of flying dust the MECHANICAL Model was proved to be more applicable to the calculation emission rate on the various dust emission conditions on a unpaved road. The seperate calculation on annual mean emission amount and a 24working hours amount was undertaken for the easy management of fugitive dust. Dust concentration predicted by FDM is similar with a measurement value.

• 한국화재소방학회논문지
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• 제12권4호
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• pp.13-19
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• 1998

Hartman식 분진폭발 장치를 이용하여 두 총회 카본블랙 High Black 10과 50L의 업도분포별, 농도별 그리고 동일한 입도분포에서 비표면적과 표면 기능기의 양에 따흔 이뜰 시료의 분진폭발 확 률, 분진폭발 압력 통을 조사함i으로서 카본블랙 분친의 위험성을 평가하고자 하였다\ulcorner 이에 카본블 랙의 비표면적을 측정하고 표면에 존재하는 기놓기룹 정량함으로서 휘발분이나 비표면적이 싱-대 적 으로 넓 몫 Hi - Black 50L의 경 우 f-lilongleftarrowBlack 10에 비 해 상대 적 으로 폭발 획 룹과 폭발 압력 이 크게 나타났으며, 최대폭발압력은 돼- Black 50L의 입도분포 230/270 mesh, 시료농도 0.9 mg/em에서 약 6 6.0 kg/em'으로 나타났다.

• 한국화재소방학회논문지
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• 제12권3호
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• pp.3-9
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• 1998

순수 활성탄과 홉착제로 사용된 동종의 폐활성탄 분진의 온도에 따른 열적 안정성을 조사하기 위 하여 열중량 분석기(TGA)를 이용하여 온도에 따른 무게감량을 조사하고 이들의 입도별 비표면 적을 측정하여 동일한 입도를 갖는 순수 활성탄과 폐활성탄 분진의 비표면적 변화에 따른 분진폭 발 특성을 살펴보고자 하였다. 분진폭발 시험 장치로는 압축공기에 의해 분진을 강제 분산시킨 후 전기 점화원에 의해 분진의 폭발성을 측정하는 Hartman 식 측정장치를 이용하여 순수 활성 탄과 폐활성탄 분진의 입도별로 분진의 농도를 변화시켜가며 분진폭발실험을 행하였다. 실험 결 과 업도가 작을수록 분진폭발압력이 크며 동일한 입도에서 폐활성탄에 비해 비표면적이 3-4배 정도 큰 순수 활성탄이 상대적으로 분진폭발 발생이 용이하며 폭발압력 또한 높은 것으로 나타 났다.

• 한국인터넷방송통신학회논문지
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• 제19권4호
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• pp.139-149
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• 2019

2018년 현재, 중국에서는 편서풍을 타고 다량의 미세먼지가 한국으로 유입되고 있다. 하지만 국내에서 발생되는 미세먼지양도 무시할 수 없다. 심지어 미세먼지 발생원인의 52%가 국내요인이다. 특히 인구가 밀집된 서울에서는 다른 지역과 비교할 수 없을 만큼 미세먼지 수치가 높다. 서울시에서도 구별로 미세먼지 수치는 다르게 나타난다. 구별로 미세먼지의 발생 차이를 이해하기 위해 서울시 미세먼지 발생원인 중 가장 높은 교통량을 기준으로 판단한다. 2017년의 교통량과 미세먼지의 농도를 비교해 실제로 교통량이 영향을 미치는지, 얼마나 영향을 미치는지, 만약 영향을 주지 않는다면 그 원인은 무엇인지 R을 이용해 비교해보고 서울시 미세먼지 발생의 원인을 확실히 인식한다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2004년도 하계종합학술대회 논문집(1)
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• pp.143-146
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• 2004

Signals of the short wave part of centimetre, millimetre and optic wave length ranges are being broadly used in the communication, location and remote sensing systems with space channels. In this case the presence of discrete non-uniform mediums like orbital debris, space dust and other discrete formations in the propagation channel may have substantial influence upon the characteristics of wave processes. and thus upon the data system quality. Mathematical models for studying the discrete non-uniform mediums effect on the characteristics of electromagnetic wave propagation are analyzed in this paper.

• International Journal of Safety
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• 제4권2호
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• pp.43-46
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• 2005

The construction workers might be at the risk of many occupational injuries and illnesses. To protect workers from various hazards, industrial health and hygiene systems were specified for the construction workers by law. It is important to know the actual health and safety(H&S) conditions by tasks and the characteristics of injuries and illnesses of construction workers. This study was designed to investigate the actual conditions of construction workers exposed to various harmful substances and work elements including evaluation of health status of each worker and general H&S system. Questionnaire was sent to 600 construction workers nationwide and totally 367 people responded to it having 61.67% of response rate. The common construction hazards were dust(29.6%), noise(19.3%), repetitive motions(12.0%), handling excessive heavy materials(11.2%) in order. The repetitive motions and handling heavy materials related to muscle disorders accounted for 23.2%. The accident and injury types were in order of overexertion, falling, overturning, dropping or flying, electric shock, collision, etc.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.449-452
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• 2005

For home networking system with a function of air quality monitoring, a wireless sensor module with several air quality monitoring sensors was developed for indoor environment monitoring system in home networking. The module has various enlargements for various kinds of sensors such as humidity sensor, temperature sensor, CO2 sensor, flying dust sensor, and etc. The developed wireless module is very convenient to be installed on the wall of a room or office, and the sensors in the module can be easily replaced due to well designed module structure and RF connection method. To reduce the system cost, only one RF transmission block was used for sensors' signal transmission to 8051 microcontroller board in time sharing method. In this home networking system, various indoor environmental parameters could be monitored in real time from RF wireless sensor module. Indoor vision was transferred to client PC or PDA from surveillance camera installed indoor or desired site. Web server using Oracle DB was used for saving the visions by web-camera and various data from wireless sensor module.

• 한국지역사회생활과학회지
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• 제18권1호
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• pp.39-53
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• 2007

The purpose of this study was to determine the characteristics of an experimental protective clothing material with regard to comfort and isolation from the hazardous heavy metals produced in municipal waste incineration. An analysis was conducted on the total concentrations of heavy metals in some parts such as surface, middle layer, and interior for the treated fabric, and the untreated one, and working clothes. We conclude that the processed fabric with charcoal for working clothes showed the least exposure to heavy metals of the three. Working clothes worn by workers during waste incineration were much more contaminated than the untreated and treated materials. The material of working clothes could be chosen according to the function with regard to its original chemical characteristics, which are the proper results of the dyeing process. The processed fabric material has high degrees of moisture regain, thermal insulation, water vapor penetration, and antibacterial function; consequently, it is much more comfortable to wear. The fabric material proposed in this research contributed much more to blocking heavy metal concentrations (such as Cd, Pb, Cu, Cr, Zn, Mn) than did the fabric of working clothes at present. Consequently, we strongly suggest that the material of working clothes be upgraded by adopting the above-mentioned charcoal-processed fabric. Materials of working clothes must be improved to increase comfort and prevent harmful gas, flying dust, and heavy metals from permeating the fabrics.

• Spatial Information Research
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• 제6권1호
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• pp.1-10
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• 1998

시선물관리와 단지설계 등 소규모지역에 대한 항공사진의 필요성은 날로 증가되고 있지만 촬영시 소용되는 비용과 여러 가지 제약으로 인하여 일반 항공사진 촬영용 항공기에 의한 항공사진을 얻는 데는 많은 어려움이 따른다. 본 연구에서는 대축척 공중사진의 효율적인 획득방법의 하나로서 비측량용 카메라를 장착한 원격조종 모형비행기에 의한 사진촬영에 대하여 고찰하였다. RC모형기의 원리를 조사 연구하여 공중사진촬영에 적합합 RC모형기를 제작하였고 이를 이용하여 공중사진을 촬영하는 실험을 수행하였다.실험결과 지상시설물의 공중사진을 중복촬용할 수 있었고 모형기를 이용하여서도 일반 항공사진 촬영용 항공기의 기능을 일부 대신할 수 있음을 확인하였다.

• 한국정밀공학회지
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• 제20권4호
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• pp.128-135
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• 2003

To decrease environmental damage, the development of environmental friendly fluids provides attractive alternative to the conventional fluids. In this study, the effects of harmful ingredients (Cl, S) contained in the fluids that used in grinding and cutting processes to influence on the nasal cavities of the white rats were measured indirectly. Also, the level of the environmental influence in workshops was graded through analyzing the concentration and chemical ingredients of flying-dust, which generated from the friction and combustion in the cutting process, that for analyzing how harmful the influence of particles to workers then it could be used as the basic data for improving the environment. To improve the conventional machining fluid, which can be harmful on worker's bodies and the environment, the environmental friendly machining method was suggested through analyzing each lubrication properties of vegetable fluid and used-edible oil as alternative fluid. As a result, it was known that an emulsion type fluid might be the main cause leading to some respiratory ailments. Also this paper presents the possibility to use vegetable fluid and used-edible oil as the alternative of cutting fluids.