[논문]부산광역시 지하철역의 오염물질 농도 변화에 관한 연구

이화운,박종길,장난심,이희령,김희만 부산대학교 환경문제연구소 2004 環境硏究報 Vol.22 No.-

on the variation of Air Pollutants concentration in Subway Station at Busan Metropolitan City

남제주 화력발전소의 증설과 저감대대책의 영향 분석

이화운,김유근,정우식,오은주,임헌호,노순아,반수진,최현정,김민선,김헌숙 부산대학교 환경문제연구소 2002 環境硏究報 Vol.20 No.-

In the view of the results investigated the effect of air pollutants that is emitted from a new generator facilities, the total estimated concentration which is the summation of a contributional concentration and observational concentration is much less than that of atmospheric environment criterion for the air pollutants. So we can predict that the operation of the new generator facilities with mitigation equipment don't seriously affect around environment. At the same time, we compared the contributional concentration of before mitigation equipment with that of after it to examine the decreasing amount due to mitigation equipment. The result showed that the concentration of SO2, NO2 and PM-10 is reduced to 25%, 30% and 26% of original value, respectively.

부산광역시의 대기질 변화경향 및 특성에 관한 연구

이화운,김유근,원경미,홍정혜,문윤섭,장난심,정우식 부산대학교 환경문제연구소 1997 環境硏究報 Vol.15 No.1

중규모 바람장 해석을 위한 Fine Mesh Model의 구성

이화운,김유근,이부용,오은주 부산대학교 기초과학연구소 1995 부산대학교 기초과학연구소 연구논문집 Vol.15 No.-

To predict reasonably the movement and the concentration of the pollutants in the coastal area. A simulation model should be prepared considering detail topography with land-sea and the urban effects, and the resolution near the source. The explicit method can not be applied due to the unstability of the numerical calculation in high horizontal-grid resolution, while the ADI scheme satisfied with the high horizontal grid resolution and can be used in the fine mesh system which shows the detail topography, atmospheric flow. The ADI method which studied the high horizonal grid resolution was excellent. The two dimentional model used in the study using ADI method is proved as a reasonable model to predict the wind field in any small scale area including mountainous coastal urban area.

모드스펙트럼해석법에 의한 교량의 내진설계에 관한 연구

유영화,최정호,김운학 안성산업대학교 1995 論文集 Vol.27 No.-

As an importance of seismic design have been increasing, it is necessary to establish an adequate guidelines of which designers can make use for the effective design according to the types of bridges. When applying the codes, seismic design forces are determined by single mode spectral analysis method for the general bridges whose geometric shape is relatively simple, where seismic design forces are obtained only using the fundamental frequency. On the contrary, when the geometeric irregularities such as span length and pier hight are developed, one can expect a substantial errors which could be taken into account in multi-mode spectral analysis. For the determination and comparison of the design forces by mode spectral analysis, the program based on design codes which performs a 3-dimensional dynamic analysis and make it easier for the designers to analyze the reponse displacements of mode shapes by means of the post processor is developed and applied to several example bridges.

유지놀 처리된 상아질 표면의 상아질 접착제의 전단결합강도에 관한 연구

유화성,최경규,최기운,박상진 대한치과보존학회 2000 Restorative Dentistry & Endodontics Vol.25 No.4

In this study, shear bond strength of two bonding systems were measured and appearance of dentin surfaces were observed with SEM according to the storage time of eugenol on dentin surface, thus evaluated the effect of eugenol on bond strength of two dentin bonding systems. Control groups were directly bonded to dentin surface with One Step, Prime & Bond 2.1. Experimental groups were divided into experimental I and II according to dentin bonding agents. After eugenol application, dentin surfaces were bonded with One Step and Prime & Bond 2.1 according to the each storage time of immediately, 3min, 24hour, 48hour and 1week, and then control and experimental groups were filled with light cured composite resin(Z-100). After 24 hours water storage at 37℃, all samples were subjected to a shear load to fracture at a cross head 1.0mm/min with Instron universal testing machine(No. 4467) . Etched dentin surface storaged for each time of immediately, 3min, 24hour, 48hour and 1week after eugenol application were observed under Scanning Electron Microscope(Hitachi S-2300) at 20kvp. The data were evaluated statistically with two-way ANOVA and Tukey's HSD. The results were as follows; 1.Shear bond strengths were higher in control groups than in the experimental groups. 2.As storage time was increased after eugenol application, the shear bond strengths were decreased in experimental groups 3.In experimental I, II the shear bond strengths were the lowest in which storage time was 1week after eugenol application. 4.As storage time was increased after eugenol application, etched dentin surfaces showed obstructed dentinal tubule.

침적 모형에 의한 습성침적 플럭스 수치모의

이화운,문난경,임주연 한국환경과학회 2002 한국환경과학회지 Vol.11 No.12

The purpose of this study is to estimate wet deposition flux and to investigate wet deposition characteristics by using the ADOM model. Wet deposition flux of high reactive SO_2 is estimated by applying observed meteorological parameters and concentrations of chemical species to the ADOM model. Wet deposition is largely dependent on large scale precipitation and cloud thickness. Wet deposition flux of sulfate increases, but wet deposition flux of SO_2 is small. On the whole, the pattern of sulfate flux agrees with the typical pattern of sulfate wet deposition that is high in the summer(July) and low in the winter(January)

부산광역시 지하철역 지하공간의 대기오염 특성

이화운,장난심,곽진,이희령,김희만 한국환경과학회 2002 한국환경과학회지 Vol.11 No.3

The purpose of this study is designed to estimate the air quality of subway stations that have the underground platforms in Pusan Metropolitan City, from September to November 2000, over seventimes. The subjects include Yonsan-dong station, Somyon station, Pusan station, Nampo-dong station, and Tushil station. The samplings were conducted at three points of each station, i.e. gate, ticket gates, and platforms. The major materials for analysis were CO, NO, NO_2, and O_3. The experiment was conducted at 7:00 pm with KIMOTO HS-seven Handy sampler and Tedlar Bag of SKC INC(U.S.A). In order to more fully understand station environments, we also measured temperature at each point. The results showed that O_3 average concentration at Yonsan-dong station was higher than others with 38~51 ppb. The average concentration of NO was high at ticket gate and platform at Somyon station(119 ppb, 122 ppb), Nampo-dong station(102 ppb, 100 ppb). These results show that the air pollution of stations with underground shopping malls was higher than others. At Somyon station having a junction station, NO and NO_2 concentration level of platform-2(noncrowded) was higher than platform-1(crowded). This is most likely due to the accumulation of air pollutants and inadequate ventilation systems.

부산광역시 지하공간의 CO 대기질 평가

이화운,박종길,장난심,이희령,김희만 한국환경과학회 2003 한국환경과학회지 Vol.12 No.1

With increasing population denities in cities, underground facilities and entertainment are proliferating at a rapid pace in efforts to maximize the use of land. The purpose of this study is to evaluate CO concentration level of subway stations having underground platforms in Busan Metropolitan City, from September to November 2000, over seven times. The places of inquiry include Yongsan-dong station. The samplings were conducted at three point of each station, i.e. gate ticket gates, and platforms. The component of CO concentration is the main elements of indoor air quality evaluation. The total concentrations and average concentration of CO were the higher at the average concentration of CO were the higher at the Somyon station. The distribution of CO concentrations at each station, generally was higher at gate than ticket gates platforms. The I?O ratios(I-platforms, O-gates) were expressed highly than 1 at the Yongsan-dong station, Busan station, Nampo-dong station and were lower 1 at others.

광학적 rank order HMT를 이용한 회색조 영상 인식

李河運,具和本 동양대학교 1996 동양대학교 논문집 Vol.2 No.1

광학적 rank order HMT를 이용한 회색조 영상에서의 새로운 물체 인식 방법을 제안 한다. 기존의 방법은 4개의 문턱화 레벨과 필터 융합을 사용하므로 시스템이 복잡하고 물체를 인식하기 위해서는 많은 시간이 소요될 수 있다. 제안한 방법에서는 회색조 영상을 적당한 값으로 이치화하고 이렇게 이치화된 영상은 hit 필터로 사용되고 이치화된 영상의 complement 영상은 miss 필터로 사용된다. 이러한 방법은 기존의 알고리듬에 비해 광학적으로 구현할 경우 비교적 간단히 할 수 있으며 물체 인식에 좀더 좋은 결과를 얻을 수 있다. A new gray-scale object recognition algorithm is presented using optical rank order HMT(hit-miss transform). The conventional HMT recognition algorithm uses 4 thresholding levels and filter fusion, therefore this system is complicate and may needs much time to detect objects. In the proposed method, gray-scale image is binarized with proper thresholding values and the binarized image is used for hit filter and its complement is used for miss filter. This method can give simple optical-implementation and better performance for object recognition compared to the conventional algorithm.