충청지역 탄산약수의 지화학적 및 동위원소적 특징

정도환,최현수,김천수,김건영,김영규 대한지질학회 2002 대한지질학회 학술대회 Vol.2002 No.

지역별 지하수중 우라늄과 라돈의 함량 분포 특성

정도환,김문수,주병규,김태승,Jeong, Do-Hwan,Kim, Moon-Su,Ju, Byoung-Kyu,Kim, Tae-Seung 한국지하수토양환경학회 2011 지하수토양환경 Vol.16 No.6

In order to figure out the characteristics of radionuclides concentrations of nine provinces, we analyzed uranium and radon in 681 samples of groundwater. Most of uranium concentrations in each province were less than $10{\mu}g/L$, and Gyeongnam, Jeonnam, Jeju provinces did not have groundwaters exceeding the US EPA drinking water MCL ($30{\mu}g/L$) of uranium. The ratio of radon values exceeding US EPA drinking water AMCL (4,000 pCi/L) was 22.6% (154/681) and Gyeongnam and Jeju provinces had no groundwaters exceeding the AMCL (alternative maximum contaminant level). Uranium and radon concentrations in groundwaters of Gyeonggi, Chungbuk, Jeonbuk, Chungnam mainly composed of the Mesozoic granite and the Precambrian gneiss were relatively high, but the concentrations of Gyeongnam and Jeju widely comprised of the sedimentary rock and the volcanic rock were relatively low. A week correlation between uranium and radon values showed in Gangwon, Chungbuk, Gyeonggi provinces.

민족을 위한 느헤미야의 기도처럼 : 성경본문. 느 1:1~11

정도환 한신대학교 신학대학원 2019 세계와 선교 Vol.- No.231

지하수 중 라듐-226의 분석방법 및 환경 특성에 관한 예비 연구

정도환,김문수,노회정,윤윤열,김동수,이영준,주병규,홍정기,김태승,Jeong, Do-Hwan,Kim, Moon--Su,Noh, Hoe-Jung,Yoon, Yoon-Yeol,Kim, Dong-Soo,Lee, Young-Joon,Ju, Byoung-Kyu,Hong, Jung-Ki,Kim, Tae-Seung 한국지하수토양환경학회 2012 지하수토양환경 Vol.17 No.2

$^{226}Ra$ in groundwater could be analyzed by various methods. LSC (liquid scintillation counter) is used to measure its activity of Ba co-precipitates with Hisafe III scintillation cocktail solution. Counting efficiency was obtained using NIST $^{226}Ra$ standard solution in triplicate and calculated $^{226}Ra$ concentration using the efficiency values. $^{226}Ra$ values of 19 groundwaters having Gross-${\alpha}$ concentrations of more than 5 pCi/L ranged from ND (${\leq}$ 0.1 pCi/L) to 1.18 pCi/L. Geologic settings of the 19 areas are composed of granitic rocks of Pre-Cambrian and Jurassic and Cretaceous, gneiss (schist) of Pre-Cambrian, and volcanic rocks of Cretaceous. No relationship was shown among $^{226}Ra$ a concentrations and in-situ water quality data, and Gross-${\alpha}$, uranium, radon concentrations.

이중 시야 중적외선 광학계 비열화·나르시서스 분석

정도환,이준호,정호,옥창민,박현우,Jeong, Do Hwan,Lee, Jun Ho,Jeong, Ho,Ok, Chang Min,Park, Hyun-Woo 한국광학회 2018 한국광학회지 Vol.29 No.3

항공용 전자 광학 타겟팅 시스템을 위한 중적외선 광학계를 설계하였다. 본 광학계는 이중 시야를 갖도록 설계되었으며, 빔 축소 전단 광학계, 줌 렌즈 그룹, 릴레이 렌즈 그룹, 콜드스탑 공액 광학계 및 냉각 적외선 검출기로 구성된다. 적외선 검출기는 단일 화소의 크기가 $15{\times}15{\mu}m$ 인 $1280{\times}1024$ 화소 배열을 가지며 잡음을 최소화하기 위하여, f/5.3의 냉각 콜드스탑이 적용된 제품으로 선정하였다. 이중 시야 ($1.50^{\circ}{\times}1.20^{\circ}$, $5.40^{\circ}{\times}4.23^{\circ}$)는 두 개의 렌즈를 삽입하는 방식으로 구현했으며, 줌 배율 변경 시 모든 시야에 걸쳐 f/5.3의 콜드스탑의 효율을 유지하도록 설계하였다. 열 효과가 이미지에 미치는 영향을 조사하기 위해 비열화 및 나르시서스 분석을 수행하였으며, 비열화 분석은 $-55{\sim}50^{\circ}C$의 작동 온도를 기준으로 초점 이동과 잔여 고차 파면 수차에 조사하였고 제르니케 다항식을 이용한 민감도 분석을 수행하여 최적의 보상자를 선정하였다. 선정된 보상자의 최적 이동을 고려한 MTF 해상력을 확인한 결과, 작동 온도 전 구간에 걸쳐 요구조건인 33 lp/mm에서 축상 10% 이상의 성능을 유지하는 것을 확인하였으며, 나르시서스 분석 결과, NITD (Narcissus Induced Temperature Difference) 값이 $1.5^{\circ}C$ 이하가 되도록 설계 된 것을 확인하였다. We have designed a mid-infrared optical system for an airborne electro-optical targeting system. The mid-IR optical system is a dual-field-of-view (FOV) optics for an airborne electro-optical targeting system. The optics consists of a beam-reducer, a zoom lens group, a relay lens group, a cold stop conjugation optics, and an IR detector. The IR detector is an f/5.3 cooled detector with a resolution of $1280{\times}1024$ square pixels, with a pixel size of $15{\times}15{\mu}m$. The optics provides two stepwise FOVs ($1.50^{\circ}{\times}1.20^{\circ}$ and $5.40^{\circ}{\times}4.23^{\circ}$) by the insertion of two lenses into the zoom lens group. The IR optical system was designed in such a way that the working f-number (f/5.3) of the cold stop internally provided by the IR detector is maintained over the entire FOV when changing the zoom. We performed two analyses to investigate thermal effects on the image quality: athermalization analysis and Narcissus analysis. Athermalization analysis investigated the image focus shift and residual high-order wavefront aberrations as the working temperature changes from $-55^{\circ}C$ to $50^{\circ}C$. We first identified the best compensator for the thermal focus drift, using the Zernike polynomial decomposition method. With the selected compensator, the optics was shown to maintain the on-axis MTF at the Nyquist frequency of the detector over 10%, throughout the temperature range. Narcissus analysis investigated the existence of the thermal ghost images of the cold detector formed by the optics itself, which is quantified by the Narcissus Induced Temperature Difference (NITD). The reported design was shown to have an NITD of less than $1.5^{\circ}C$.

교회개혁과 목회영성

정도환 한신대학교 신학대학원 2018 세계와 선교 Vol.- No.229

전과정평가를 이용한 정수장의 환경부하 저감방안에 관한 연구

정도환,김성근 한국방재학회 2015 한국방재학회논문집 Vol.15 No.1

In this study, a life cycle assessment (LCA) that quantitatively calculates environmental loads, is performed for a water treatment plant(purification plant), and a method for reducing environmental loads for the plant is proposed. The environmental loading substancesaccording to the six impact categories of the environmental declaration of products (EDP) are quantitatively calculated. The resultsindicated that 98.9% of all environmental loading substances are generated in the global warming impact category. CO2 accounts for97.2% of the total emissions, and with regards to each stage of the entire life-cycle, 99.9% of environmental loads occurs in the constructionstage, while 0.1% occurs in the operation, deconstruction, and recycling stages. The results from the purification facility arecompared with those obtained from a wastewater reuse facility to examine any similarities and differences. Moreover, four scenariosare proposed as methods for reducing environmental loads, in order to verify the reduction of environmental loads at the purificationplant. Furthermore, reduction effects are confirmed by applying the developed reduction method to a practical case, and conducting anLCA analysis. 본 연구에서는 환경부하를 정량적으로 산출하는 LCA 분석기법을 사용하여 정수처리시설을 대상으로 환경부하를 평가하고 저감방안을 제시하였다. 정수처리시설의 전과정에 대한 LCA 분석을 수행하여 환경성적표지제도의 6가지 영향범주에 대한 환경부하물질의 정량적 산출을 수행하였다. 분석 결과 전체 환경부하물질 중 98.9%가 지구온난화 영향범주에서 발생하였다. CO2가 전체 배출의 97.2%를 차지하였으며 전과정 단계별로 살펴보았을 때 건설단계에서 99.9%, 운영, 해체 및 재활용단계에서 0.1%의 환경부하가 발생하는 것으로 나타났다. 결과를 바탕으로 하수처리수 재이용시설과의 비교를 통하여 LCA 분석 시 고려한 유사점 및 차이점을 분석하였다. 그리고, 정수처리시설의 환경부하 저감을 검증하기 위해 4가지의 시나리오를 환경부하 저감방안으로 제시하였다. 또한, 구축된 저감방안을 본 사례에 적용한 후 LCA 분석을 수행하여 저감효과를 확인하였다.

국내 화산암 지역 지하수 중 자연방사성 물질에 대한 환경 특성

정도환,김문수,주병규,홍정기,김동수,김현구,김혜진,박선화,한진석,김태승,Jeong, Do Hwan,Kim, Moon Su,Ju, Byoung Kyu,Hong, Jung Ki,Kim, Dong Su,Kim, Hyun Koo,Kim, Hye Jin,Park, Sun Hwa,Han, Jin Seok,Kim, Tae Seung 한국지하수토양환경학회 2013 지하수토양환경 Vol.18 No.1

We analyzed natural radionuclides in 80 wells in volcanic rock areas and investigated environmental characteristics. Uranium and radon concentrations ranged from ND to $9.70{\mu}g/L$ (median value: 0.21) ${\mu}g/L$, 38~29,222 pCi/L (median value: 579), respectively. In case of gross-${\alpha}$, 26 samples exceeded MDA (minimum detectable activity, < 0.9 pCi/L) value and the activity values ranged from 1.05 to 8.06 pCi/L. The radionuclides concentrations did not exceed USEPA MCL (maximum contaminant level) value of Uranium ($30{\mu}g/L$) and gross-${\alpha}$ (15 pCi/L). But Rn concentrations in 4 samples exceeded USEPA AMCL (Alternative maximum contaminant level, 4,000 pci/L) and one of them showed a significantly higher value (29,222 pCi/L) than the others. The levels of uranium concentrations in volcanic rock aquifer regions were detected in order of andesite, miscellaneous volcanic rocks, rhyolite, basalt aquifer regions. Radon, however, was detected in order of miscellaneous volcanic rocks, rhyolite, andesite, basalt aquifer regions. The correlation coefficient between uranium and radon was r = 0.45, but we found that correlations of radionuclides with in-situ data or major ions were weak or no significant. The correlation coefficient between the depth of wells and uranium concentrations was a slightly higher than that of depth of wells and radons. Radionuclide concentrations in volcanic rock aquifers showed lower levels than those of other rock aquifers such as granite, metamorphic rock aquifers, etc. This result may imply difference of host rock's bearing-radioactive-mineral contents among rock types of aquifers.

먹는샘물 업체의 원수와 주변 지표수에 대한 환경동위원소적 연구

정도환,이병대,조병욱,김영규 대한지질학회 2006 대한지질학회 학술대회 Vol.2006 No.

고함량 자연방사성물질 우려지역에 대한 지하수 환경 특성 연구

정도환,엄익춘,윤정기,김문수,김영규,김태승,Jeong, Do-Hwan,Eom, Ig-Chun,Yoon, Jeong-Ki,Kim, Moon-Su,Kim, Yeong-Kyoo,Kim, Tae-Seung 한국지하수토양환경학회 2010 지하수토양환경 Vol.15 No.6

Groundwater sampling was performed at 38 wells where they are located in the areas with high uranium and radon (marked as A and B, respectively) concentrations, which were based on the previous research results. In-situ parameters (temperature, pH, EC, Eh, DO) and natural radionuclides (uranium and radon) were analyzed to figure out the characteristics of groundwater environments. In-situ data did not show any relations to natural radionuclide data, which could be caused by groundwater mixing, depths of wells, and geological settings, etc. But the highest radon well presented relatively low temperature value and the highest uranium well presented relatively low pH values The highest uranium concentration ranging $1.14{\sim}188.19{\mu}g/L$ showed in the area of A region consisted of Jurassic two-mica granite. The areas of Jurassic biotite granite and Cretaceous granite in the A region have the uranium concentrations ranging $0.10{\sim}49.78{\mu}g/L$ and $0.36{\sim}3.01{\mu}g/L$, respectively. The uranium values from between wells of community water systems (CWSs) penetrating fractured bed-rock aquifers and personal boreholes settled in shallow aquifers near the wells of CWSs show big differences. It implies that the groundwaters of the two areas have evolved from different water-rock interaction paths that may caused by various types of wells having different aquifers. High radon activities in the area of B region composed of Precambrian gneiss showed ranging from 6,770 to 64,688 pCi/L. Even though the wells are located in the same geological settings, their rodon concentration presented different according to depth and distance.