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2005, Vol.14, No.4

  • 1.

    A study on plant effects on decontamination of polluted indoor air with formaldehyde

    Sung Kijune | Young-Kee Jang | 박소영 and 1other persons | 2005, 14(4) | pp.147~155 | number of Cited : 1
    Abstract PDF
    This study was designed to investigate the effect of plant as a botanical air purification on theindoor pollution by formaldehyde. Three indoor plants such as Dracaena marhginata,Spathiphyllum and Dracaena reflexa, were placed in the artificially contaminated reactor underlaboratory condition. Both plant and soil effects on removal of formaldehyde from contaminatedindoor air were observed. Reductions in the formaldehyde levels appeared to have beenassociated with soil medium factors as well as plant factors. The effect of soil on formaldehydereduction was high in the early stage of the experiment and the results suggest that sorptioncould be more important factor than microbial degradation in the initial dissipation ofcontaminants in the soil. It was suggested that the effect of plant on formaldehyde reductionmight be related to the plant species, total leaf surface area of plant, degree of contribution of soilmedium, and exposed concentration level. The results of this study showed that air purificationusing plants is an effective means of reduction on indoor formaldehyde level, though, utilizationof soil media with high sorption capacity and/or supplementary purifying aids were alsosuggested when the source is continuous or exposed concentration level is high.
  • 2.

    Prediction of Daily Water Supply Using Neuro Genetic Hybrid Model

    RHEE, KYOUNGHun | 강일환 | Moon,Byoung-Seok and 1other persons | 2005, 14(4) | pp.157~164 | number of Cited : 0
    Abstract PDF
    Existing models that predict of Daily water supply include statistical models and neuralnetwork model. The neural network model was more effective than the statistical models. Onlyneural network model, which predict of Daily water supply, is focused on estimation of theoperational control. Neural network model takes long learning time and gets into localminimum.This study proposes Neuro Genetic hybrid model which a combination of genetic algorithmand neural network. Hybrid model makes up for neural network’s shortcomings. In this study,the amount of supply, the mean temperature and the population of the area supplied with waterare use for neural network’s learning patterns for prediction.RMSE(Root Mean Square Error) is used for a MOE(Measure Of Effectiveness). Thecomparison of the two models showed that the predicting capability of Hybrid model is moreeffective than that of neural network model. The proposed hybrid model is able to predict ofDaily water, thus it can apply real time estimation of operational control of water works andwater drain pipes. Proposed models include accidental cases such as a suspension of water supply. The maximum error rate between the estimation of the model and the actual measurement was 11.81% and the average error was lower than 1.76%. The model is expected to be a real-time estimation of the operational control of water works and water/drain pipes.
  • 3.

    A Study on Importance of Assessment Factors and Indicators of Natural Ecosystem for Environmentally Friendly Land Conservation

    유주한 | JUNG SUNG GWAN | Kyunghun Park | 2005, 14(4) | pp.165~177 | number of Cited : 9
    Abstract PDF
    This study was carried out to offer the basic methodology of the system and model toobjectively assess the natural ecosystem for environmentally friendly land conservation andpresent the alternative plan on establishing the environmental policy. The results of this studywere as follows.We selected four assessment factors associated with biotic, abiotic, qualitative, and functionalfactors. Also, there were extracted fifty-six indicators including density, total nitrogen, hemerobydegree, and goods production. The assessment factor showed that biotic one was veryimportant. The importance of indicators were analyzed that rare and endangered plant wasimportant in biotic factor, in case of abiotic, qualitative, and functional factors, organic matter,landscape diversity, and conservation of ecosystem were greatly important. The results of factoranalysis on the characteristics of indicators, classified biotic factor into six factors including astructural one, abiotic factor as a soil and physical one, qualitative factor as five ones includinghierarchical one, and functional factor as public and conservational one. In the results of analysis on assessment model, R-square of biotic factor was 51.7%, those of abiotic, qualitative, and functional one were each 58.4%, 44.2%, and 39.3%, and statistical problem was no existence. In future, to develop the assessement model and methodology of sustainable natural ecosystem, we will have to achieve the integrated model and grouping by assessment factor.
  • 4.

    A Study on the Alternative Environmental Assessment System in KOREA : Applying New Conceptual Model(APEMI IA MODEL) into Impact Assessment for Better Integrated Decision-Making

    ImSoon Kim | 한상욱 | 2005, 14(4) | pp.179~193 | number of Cited : 6
    Abstract PDF
    As the world’s attention turns to sustainability and the considerations of cumulative effects,the concept of Strategic Environmental Assessment(SEA) has become more significant andurgent and increasing number of countries and international organizations now undertakesome forms of SEA. The term SEA, however, is variously defined and understood; generally itmeans a formal process of systematic analysis of the environmental effects on developmentpolicies, plans, programmes and other proposed strategic actions. This process extends the aimsand principles of EIA upstream in the decision-making process, beyond the project level inwhich major alternatives are still open.There is a shift toward more integrative approaches and greater use of Environmental ImpactAssessment (EIA) and Strategic Environmental Assessment (SEA) as sustainability tools incooperation with Environmental Management System (EMS). Currently, Korea has EIA systemand Prior Environmental Review System (PERS) which is different type of SEA as EnvironmentAssessment (EA) system. APEMI IA MODEL integrated following three pillar(refer to attached figure.1) ; First pillar symbolized decision making cycle with planning process. Second pillar symbolized integrated assessment which tying SEA and EIA with specific impacts assessment(eg: social impact assessment, economic impact assessment, health impact assessment etc) in cooperation with EMS. Third pillar symbolized EA best practical procedure of International Association for Impact Assessment(IAIA). Considering the above, we applied new conceptual model(APEMI IA MODEL) into Impact Assessment for better integrated decision-making in KOREA as an alternative IA system(IS IA MODEL A and B refer to attached figure 4, 5).
  • 5.

    Study for exposure limits of magnetic fields in the transformer substation

    전인수 | 2005, 14(4) | pp.195~202 | number of Cited : 1
    Abstract PDF
    The health risks from the magnetic fields exposure have been brought out difficulties in theconstruction of transformer substation. According to several epidemiologic studies and therelevant international organizations, magnetic fields should not exceed the exposure limits of3mG for the people living near electric power lines. The rigid regulation of the exposure levelsfor the elementary school and residental areas has been established already in Switzerland andItaly. Since 1998, the environmental impact assessment system in Korea has been reviewed forpower-frequency magnetic field by precautionary policies.In this study, the possible application of Prior Environmental Performance Review Systemfor the transformer substation was reviewed from the points of the properties of the power-frequency magnetic fields. The ranges and survey methods of the assessment for thetransformer substation were proposed. The ranges of magnetic fields was between 300m to500m for the 345kV transformer substation. It is necessary to develop further specificassessment methods for various high-voltage transformer substations.
  • 6.

    A Study on the Integration of Education for Sustainable Development into the School-Based Enterprises in Vocational High Schools

    Nam Youngsook | Hyunrae Cho | 2005, 14(4) | pp.203~215 | number of Cited : 0
    Abstract PDF
    Recently, a number of high school, college and university run the School-BasedEnterprises(SBE). The purpose of this study is to integrate Education for SustainableDevelopment(ESD) into the SBE run by vocational high schools. To achieve this goal, this papertakes following research considerations.First of all, this study review the theories of SBE and ESD. Secondly, We extract the factors toanalyze from the ESD point of view and integrate them into the SBE in vocational high schools.Thirdly, this study suggests the necessity and methods to integrate ESD into the SBE.ESD could serve important roles to promote the SBE by stimulating the sustainabledevelopment and improving human abilities in solving both the environment anddevelopment problems.
  • 7.

    An Experiment Study on Floor-Impact Sound Insulation by Resilient Materials in Apartment Buildings

    윤세철 | oh Jong-Min | 2005, 14(4) | pp.217~225 | number of Cited : 0
    Abstract PDF
    In apartment buildings, floor-impact sound has bean regarded as the major source whichinduces complaints from residents. It is mainly due to the use of light-weight structures. Thevibration produced by impact on one part of an apartment building would travel as far as theother parts of structure with a little alleviation. As a result, the impact sound from upstairs hasbeen regarded as a main source of noise causing discontentment among occupants. This studywas carried out to measure the floor-impact sound levels and evaluate the insulationperformance of floor-impact sound for nine apartment buildings. The floor-impact sound levelswere measured for twenty-five On-dol floor structures and various factors which influence thefloor-impact sound were analyzed.
  • 8.

    Receptor model(CMB) and source apportionments of VOCs in Seoul metropolitan area

    한진석 | Sanguk Lee | LEE SUK JO and 2other persons | 2005, 14(4) | pp.227~235 | number of Cited : 5
    Abstract PDF
    Source contribution for VOCs collected in Seoul metropolitan area was conducted usingPAMs (Photochemical assessment monitoring system) data and CMB(Chemical Mass Balance)model8.0, in order to estimate spatial and temporal variations of VOCs source contribution inthat area, and also to compare with corresponding emission inventory. VOCs data used inmodel calculation were collected at 6 different sites of PAMs(Seokmori, Guwoldong,Simgokdong, Bulgwangdong, Jeongdong and Yangpyeong) and 22 out of 56 VOCs specieswere analyzed from June 2002 to march 2003 and used for CMB model estimation. The resultshowed that vehicle exhaust, coating and energy combustion were important sources of VOCsin Seoul metropolitan area, averaging 32.6%, 25.5% and 25.1%, respectively. In this study aswell as other references, it was revealed that vehicle exhaust is the main contributor of urbanarea VOCs, but there is remarkable contrast between emission inventory and model estimation.Vehicle exhaust portion is seriously underestimated while coating is usually overestimated inemission estimates, compared to CMB results. Therefore, it is considered to assert and confirmthe uncertainty of emission estimates and clarify the distinction between two other sourceapportionment methods.
  • 9.

    Water Environmental Assessment by the Species Biotic Index of Freshwater Fish in the Namdaecheon, Gangneung city

    이춘원 | 백현민 | 송호복 | 2005, 14(4) | pp.237~245 | number of Cited : 6
    Abstract PDF
    We investigated the water environmental assessment by the species biotic index (SBI) offreshwater fish at the Namdaecheon in Gangneung city, Gangweon-do during June and July in2004 and June in 2005. In fish fauna, 29 species and 10 families were collected. Dominant specieswas Zaccoplatypus (relative abundance 15.33%) and subdominant species was Rhynchocyprissteindachneri(13.13%). Species biotic index (SBI) in station 1, 2, 3, 4 was 1.70, 2.85, 1.00 and 3.39respectively and water environmental grade by SBI was all very good . Station 5 was 4.13 in SBIand good grade. Station 6 was 4.47 and fairly good. Station 7 was 7.25 and poor. And station 8was 8.10 and very poor grade. Results of water environmental grade by SBI and water qualitygrade were very similar in this stream.