동해탄광 주변 산성광산폐수와 하상퇴적물의 지구화학

오대균,김정엽,전효택,Oh, Dae Gyun,Kim, Jung Youp,Chon, Hyo Taek 대한자원환경지질학회 1995 자원환경지질 Vol.28 No.3

Geochemistry of stream water and sediment collected in the vicinity of the Donghae coal mine in the Samchuk coalfied were investigated in order to evaluate the environmental impacts of acid mine drainage. The pH of stream water ranges from 2.85(at 2 km away from the mine) to 7.92(at uncontaminated tributary). The main cation and anion species in the upper stream are $Ca^{2+}$ and $SO_{4}{^2-}$, respectively. The level of pH and the amount of $HCO^{3-}$ in stream water increase to the downstream and where uncontaminated small tributaries are joining, and in the area covered with limestone. From the results of thermodynamic calculation, the main forms of iron in stream water are estimated as $Fe^{2+}$ and $FeSO_{4}{^0}$, and most of them could be precipitated as FeO(OH) with increase of pH. The white precipitates in stream sediments particularly found around the coal mine are proved to be $Al(OH)_3$ by XRD and XRF analysis. As a result of investigation for seasonal variation of AMD, the level of pH decreased and conductivity increased in dry season.

경남 밀양지역 납석광상과 안산암질 모암의 지구화학적 연구

오대균,전효택,민경원,Oh, Dae-Gyun,Chon, Hyo-Taek,Min, Kyoung-Won 대한자원환경지질학회 1992 자원환경지질 Vol.25 No.1

Several pyrophyllite deposits occur around the Milyang area where Cretaceous andesitic rocks and spatially related granitic rocks are widely distributed. Pyrophyllite ores consist mainly of pyrophyllite, and quartz with small amount of sericite, pyrite, dumortierite, and diaspore. The andesitic rocks and spatially related granitic rocks in this area suggest that they could be formed from the same series of a calc-alkaline magma series. The contents of $SiO_2$, $Al_2O_3$, LOI(loss on ignition) are enriched, and $K_2O$, $Na_2O$, CaO, MgO, $Fe_2O_3$ are depleted in altered andesitic rocks and ores. Enrichment of As, Cr, Sr, V, Sb and depletion of Ba, Cs, Ni, Rb, U, Y, Co, Sc, Zn are characteristic during mineralization. The pyrophyllite ores can be discriminated from the altered-and unaltered wall-rocks by an increasing of $(La/Lu)_{cn}$ from 4.18~22.13 to 8.98~55.05. In R-mode cluster analysis, Yb-Lu-Y, La-Ce-Hf-Th-U-Zr, $TiO_2-V-Al_2O_3$, Sm-Eu, $CaO-Na_2O-MnO$, Cu-Zn-Ag, $K_2O-Rb$ are closely correlated. In the discriminant analysis of multi-element data, $P_2O_5$, As, Cr and $Fe_2O_3$, Sr are helpful to identify the ores from the unaltered-and altered wall-rocks. In the factor analysis, the factors of alteration of andesitic rocks and ore mineralization were extracted. In the change of ions per unit volume, $SiO_2$, $Al^{3+}$ and LOI are enriched and $Na^+$, $K^+$, $Ca^{2+}$, $Mg^{2+}$, $Mn^{2+}$ and $Fe^{3+}$ are depleted during the alteration processes. The Milyang and the Sungjin pyrophyllite deposits could be mineralized by hydrothermal alteration in a geochemical condition of low activity ratio of alkaline ions to hydrogen ion with reference to spatially related granitic rocks.

밀양지역 납석광상 화산암질 모암에서의 원소들의 지구화학적 분산

오대균,전효택,Oh, Dae-Gyun,Chon, Hyo-Taek 대한자원환경지질학회 1993 자원환경지질 Vol.26 No.3

Mineralogical and geochemical studies on some pyrophyllite deposits in Milyang area, Kyeongnam Province (Milyang and Sungjin mine) were carried out in order to investigate dispersion patterns of chemical elements in altered volcanic wallrocks, and to interpret genetic environments of the pyrophyllite deposits. Cretaceous andesitic and tuffaceous rocks, and pyrophyllite ore specimens were collected from the dumps and drilling cores. Andesitic wallrocks were grouped as unaltered and altered rocks in the order of pyrophyllitization. Vertical dispersion patterns and relative mobilities of chemical elements in volcanic wallrocks were discussed. Geochemical environment in the Milyang area is characterized by the occurrence of boron minerals such as dumortierite coexisting with pyrophyllite ores, and tourmaline in granitic rocks. Unaltered andesitic rocks are mainly composed of plagioclase, pyroxene and hornblende, and were propylitized and saussuritized. Altered andesitic rocks are bleached and consist of quartz, sericite, pyrophyllite, kaolinite, chlorite and disseminated pyrite. Pyrophyllite ores are mainly composed of quartz, pyrophyllite, dumortierite, dissemianted pyrite and some diaspore. Enrichment of $SiO_2$, $Al_2O_3$, LOI (loss on ignition), As and Cr, and depletion of $K_2O$, $Na_2O$, CaO, MgO and total Fe are characteristic during alteration process. The REE patterns show that the pyrophyllite deposits could be originated from the continental margin volcanics. The $(La/Lu)_{cn}$ ratios of the pyrophyllite ores increase from 4.2~23.2 to 2.67~128.8 owing to strong acidic hydrothermal alteration. Vertical dispersion patterns of $Al_2O_3$, $K_2O$, $Na_2O$, CaO, MgO, $Fe_2O_3$ (total Fe), As, Au, Sb, Cr and Sr in the wallrocks show the location of orebodies. Particularly dispersion patterns of $Al_2O_3$ and Cr indicate the extension of orebodies. Anomalous distribution of Au, As and Sb in wallrocks shows potential for gold occurrence below the pyrophyllite deposits. Judging from the relative mobilities of elements in wallrocks, $Al_2O_3$ could be added from hydrothermal solution, and the silicified rone be formed from the excess of $SiO_2$.

기후변화협약에서 신.재생에너지의 기회와 도전

오대균(Oh, Dae-Gyun),김경희(Kim, Kyung-Hee) 한국신재생에너지학회 2005 신재생에너지 Vol.1 No.3

기후변화협약이 지난 2월16일 교토의정서의 발효로 새로운 국면을 맞이하게 되었다. 선진국들의 감축활동의 본격시작, EU의 배출권거래의 시작, CDM/JI사업을 통한 크레딧 확보를 인한 탄소기금의 형성 등 이제는 기후변화협약의 협상에 대한 논의에서 온실가스 감축을 위한 실질적인 이행이 시작되고 있다. 이산화탄소가 거래수단이 되는 새로운 경제체제가 만들어지고 있는데, 온실가스 감축실적이 양(+) 또는 음(-)의 추가적인 경제가치를 가지게 된다. 신재생에너지는 높은 초기투자비용에 의한 어려움을 가지고 있는데, 기후변화협약과 이에 의한 CDM사업의 활성화로 새로운 기회를 맞이하게 되었다. 신재생에너지 부문은 고유가와 온실가스 크레딧의 수요 증대로 시장의 수요와 기회가 증대되고 있지만, 이에 대하여 국내 입장에서 검토하여보고 이러한 기회가 어떤 의미를 가지게 되는지를 되짚어 보고자 한다.

안전한 메시지교환을 위한 XML 기반의 변환시스템

오대균 ( Dae-gyun Oh ),홍창범 ( Chang-bum Hong ),송정길 ( Jung-gil Song ) 한국인터넷정보학회 2002 인터넷정보학회논문지 Vol.3 No.4

XML 스키마가 2001년 5월 W3C의 공식 표준안으로 확정되고, XSL과 Xpath, Namespace등의 XML 관련 기술이 발전됨에 따라 XML은 새로운 문서교환의 표준이 되어가고 있다. XML은 다양한 문서의 구조를 표현할 수 있기 때문에 ebXML, RosettaNet, BizTalk들이 e-Business 부분에서 XML을 핵심기술로 사용하고 있다. B2B 전자상거래 시스템에서 업무를 자동화하기 위해서는 표준의 XML 문서가 필요하다. 각 기업들의 내부 문서를 외부기업의 자동화 시스템에서 처리하기 위해서는 문서의 정보손실 없이 외부기업의 문서 형태로 변환하여야 한다. 본 논문에서는 자바 서블릿을 기반으로 XML 문서의 변환하여, 안전한 문서교환을 제공하는 XML 시스템을 설계 구현하였다. As a XML Schema has been settled to W3C as official standard at May. 2001 and technologies like as XSL, Xpath and NameSpace related with XML has been developing, XML is becoming the standard of the new document exchanging. Due to the ability expressing various types of documentstructure through XML, ebXML, RosettaNet, and BizTalk are using XML as a core technology in the part of e-Business, To make the task automatically in the B2B EC now, a standard XML document is needed. Internal documents in each company should be transformed differently without any loss to work with other companies. In this paper, transforming XML document based on JAVA servlet is considered as realization of a XML system to exchange documents safely.

UML을 이용한 PDM 시스템 요구사항 분석

오대균(Dae Kyun Oh),김용균(Yong Gyun Kim),이장현(Jang Hyun Lee),신종계(Jong Gye Shin) (사)한국CDE학회 2008 한국CDE학회 논문집 Vol.13 No.2

MIB 생성을 위한 GDMO 개발 환경 설계 및 구현

김영철(Young-Chul Kim),오대균(Dae-Gyun Oh),정진영(Jin-Young Jung) 한국컴퓨터정보학회 2004 韓國컴퓨터情報學會論文誌 Vol.9 No.3

TMN(Telecommunication Management Network)에서의 네트워크 관리는 네트웍 통신 장비 및 운영 시스템인 관리 객체들을 정의하고 관리하는 것이다. GDMO(Guideline Definition Managed Object)는 이 객체들을 기술하기 위하여 이용된다. 그러나 GDMO는 네트워크를 직접 관리하기 위하여 이용되지는 않지만, 대신 객체 지향 패러다임을 가진 다른 언어로 번역되어 이용된다. 본 논문에서는 MIB를 생성하기 위하여 GDMO를 망관리에 필요한 다른 객체 지향 패러다임 언어로 자동 번역하는 번역기를 설계하고 구현한다. 또한 본 시스템은 GDMO의 개발 환경을 지원하기 위하여 다양한 그래픽 인터페이스를 지원한다. The management of network in TMN(Telecommunication Management Network) defines and manages the objects which are the operating system and communication equipments in network. The GDMO(Guideline Definition Managed Object) is used to describe those objects. GDMO is not directly used for managing network, but translated language into a language with object-oriented paradigm, then which is used. This paper presents design and implementation of the translator which automatically translates the specification of GDMO to the object-oriented language for generating MIB. And the system includes various graphic user interface to advance the developement environment of GDMO.

저전력 IoT 센서 구동을 위한 태양광 에너지 하베스팅을 위한 IV Curve 전력 계산회로

임윤찬(Yun Chan Im),오대균(Dae-Gyun Oh),김용신(Yong Sin Kim) 한국컴퓨터정보학회 2019 한국컴퓨터정보학회 학술발표논문집 Vol.27 No.2

조선 PDM 구축을 위한 기능 연구 및 시험 구현 사례

이장현(Jang Hyun Lee),김용균(Yong Gyun Kim),오대균(Dae Kyun Oh),신종계(Jong Gye Shin) 대한조선학회 2005 大韓造船學會 論文集 Vol.42 No.6

신재생에너지 사업의 청정개발체제 사전 타당성 평가 프로그램 개발

박종배(Jong-Bae Park),정윤원(Yun-Won Jeong),이우남(Woo-Nam Lee),이상형(Sang-Hyung Lee),원성희(Sung-Hee Won),허보연(Bo-Yeon Hur),오대균(Dae-Gyun Oh),하경애(Gyung-Ae Ha) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7

The cost-effective reduction of greenhouse gas (GHG) emission to avert the most severe impacts of climate change remains one of the widely accepted priorities for global action. In order to facilitate cost-effective abatement strategies, the Kyoto Protocol introduced three mechanisms, or flexible instruments, the Emissions Trading (ET), the Joint Implementation (JI) and the Clean Development Mechanism (CDM). The CDM enables Annex I countries to the Kyoto Protocol to partially meet cost-effectively their emission reduction commitments by undertaking GHG mitigation projects in developing countries, which do not have any GHG abatement obligations and where the emission reductions arc cheaper. One of the major barriers hampering the wide spread implementation of CDM is the high transaction costs associated with the initial identification of promising CDM projects. This paper presents development of a pre-validation program of CDM. The developed program may provide a useful aid to potential investors and project developers as a supportive pre-evaluation tool, and may become an effective tool for the promotion of renewable energy and fuel switching projects.