한국어 Text-to-speech 시스템의 음질 개선에 관한 연구

이현구,노용완 (사)디지털산업정보학회 2007 디지털산업정보학회논문지 Vol.3 No.4

패들형 유동층 건조기 상품화를 위한 기초적 연구

이현구,금성민,이창언,이광철,유병훈,공민석 대한기계학회 2006 大韓機械學會論文集A Vol.30 No.6

포항(浦項) 및 장기분지(盆地)에 대한 고지자기(古地磁氣), 층서(層序) 및 구조연구(構造硏究); 화산암류(火山岩類)의 K-Ar 연대(年代)

이현구,문희수,민경덕,김인수,윤혜수,이타야 테츠마루,Lee, Hyun Koo,Moon, Hi-Soo,Min, Kyung Duck,Kim, In-Soo,Yun, Hyesu,Itaya, Tetsumaru 대한자원환경지질학회 1992 자원환경지질 Vol.25 No.3

The Tertiary basins in Korea have widely been studied by numerous researchers producing individual results in sedimentology, paleontology, stratigraphy, volcanic petrology and structural geology, but interdisciplinary studies, inter-basin analysis and basin-forming process have not been carried out yet. Major work of this study is to elucidate evidences obtained from different parts of a basin as well as different Tertiary basins (Pohang, Changgi, Eoil, Haseo and Ulsan basins) in order to build up the correlation between the basins, and an overall picture of the basin architecture and evolution in Korea. According to the paleontologic evidences the geologic age of the Pohang marine basin is dated to be late Lower Miocence to Middle Miocene, whereas other non-marine basins are older as being either Early Miocene or Oligocene(Lee, 1975, 1978: Bong, 1984: Chun, 1982: Choi et al., 1984: Yun et al., 1990: Yoon, 1982). However, detailed ages of the Tertiary sediments, and their correlations in a basin and between basins are still controversial, since the basins are separated from each other, sedimentary sequence is disturbed and intruded by voncanic rocks, and non-marine sediments are not fossiliferous to be correlated. Therefore, in this work radiometric, magnetostratigraphic, and biostratigraphic data was integrated for the refinement of chronostratigraphy and synopsis of stratigraphy of Tertiary basins of Korea. A total of 21 samples including 10 basaltic, 2 porphyritic, and 9 andesitic rocks from 4 basins were collected for the K-Ar dating of whole rock method. The obtained age can be grouped as follows: $14.8{\pm}0.4{\sim}15.2{\pm}0.4Ma$, $19.9{\pm}0.5{\sim}22.1{\pm}0.7Ma$, $18.0{\pm}1.1{\sim}20.4+0.5Ma$, and $14.6{\pm}0.7{\sim}21.1{\pm}0.5Ma$. Stratigraphically they mostly fall into the range of Lower Miocene to Mid Miocene. The oldest volcanic rock recorded is a basalt (911213-6) with the age of $22.05{\pm}0.67Ma$ near Sangjeong-ri in the Changgi (or Janggi) basin and presumed to be formed in the Early Miocene, when Changgi Conglomerate began to deposit. The youngest one (911214-9) is a basalt of $14.64{\pm}0.66Ma$ in the Haseo basin. This means the intrusive and extrusive rocks are not a product of sudden voncanic activity of short duration as previously accepted but of successive processes lasting relatively long period of 8 or 9 Ma. The radiometric age of the volcanic rocks is not randomly distributed but varies systematically with basins and localities. It becomes generlly younger to the south, namely from the Changgi basin to the Haseo basin. The rocks in the Changgi basin are dated to be from $19.92{\pm}0.47$ to $22.05{\pm}0.67Ma$. With exception of only one locality in the Geumgwangdong they all formed before 20 Ma B.P. The Eoil basalt by Tateiwa in the Eoil basin are dated to be from $20.44{\pm}0.47$ to $18.35{\pm}0.62Ma$ and they are younger than those in the Changgi basin by 2~4 Ma. Specifically, basaltic rocks in the sedimentary and voncanic sequences of the Eoil basin can be well compared to the sequence of associated sedimentary rocks. Generally they become younger to the stratigraphically upper part. Among the basin, the Haseo basin is characterized by the youngest volcanic rocks. The basalt (911214-7) which crops out in Jeongja-ri, Gangdong-myon, Ulsan-gun is $16.22{\pm}0.75Ma$ and the other one (911214-9) in coastal area, Jujon-dong, Ulsan is $14.64{\pm}0.66Ma$ old. The radiometric data are positively collaborated with the results of paleomagnetic study, pull-apart basin model and East Sea spreading theory. Especially, the successively changing age of Eoil basalts are in accordance with successively changing degree of rotation. In detail, following results are discussed. Firstly, the porphyritic rocks previously known as Cretaceous basement (911213-2, 911214-1) show the age of <TE

將軍鑛山 부근에 分布하는 將軍炭酸藍岩의 熱水變質作用

李鉉具 충남대학교 1985 忠南科學硏究誌 Vol.12 No.1

The Janggun mine is situated approximately at latitude 36°51′N, longitude 129°04′E. The ore deposits of Janggun mine may be classified into manganese deposits and lead-zinc-silver deposits. The manganes deposits may be subdivided into manganese corbonate and mangcnes oxide deposits on the basis of their mineralogy and genesis. The manganese carbonate and the lead-zinc-silver deposits are of hydrothermal - metasomatic origin, charaeterized by marked hydrothermal alteration of the wall rocks, such as hydrothermal manganese enrichment of carbonate rocks, silicification, chloritization, sericitization and argillic alteration. The Janggun Limestone Formation, in which the ores have been deposited, varies thickness from 100∼800m, and consists mainly of gray∼white massive limestone, vermiculas limestone, dolomitic limestone and dolomite rock with some intercalations of siliceous and muddy carbonate rocks. These carbonate rocks have been thoroughly recrystallized and contain metamorphic minerals, such as phlogopite, biotite, manganes calcite, etc. The Janggun carbonates near the lead-zinc-silver orebodies show some evidence of influence by mineralization. Polarizing microscopic studies, X-ray diffraction analysis, stainning methods by arizarin red S and AgNO_3-K_2CrO_4, and chemical analyses by EPMA were made on the carbonate minerels. The results obtained are summerized as follows. 1. On the basis of the petrological study, wall rock alteration zone of this mine may be divided into the following four zones from orebody to wall rock. 1) Rhodochrosite zone. 2) Dolomite zone. 3) Dolomitic limestone zone. 4) Primary calcite and dolomite zone. 2. By means of electron probe microanalysis, it was found that manganoan, dolomite occured between primary dolomite grains, cross the cleavage of the primary dolomite, and around the dolomite grains. 1) There was not recognized Mn and Fe elements in the primary calcite and dolomite zone. 2) In the dolomitic limestone zone, calcite and dolomite were subjected to weak hydrothermal manganese enrichment and the grade of the manganese enrichment increases oreward. 3) Rhodochrosite zone consisted of rhodochrosite, manganoan calcite and magnecian calcite. 3. This study supports that the Janggun manganese carbonate deposits are of hydrothermal metasomatic origin.

Structural Constraints on Gold-Silver-Bearing Quartz Mineralization in Strike-slip Fault System, Samkwang Mine, Korea

이현구,유봉철,홍동표,김경웅,Lee, Hyun Koo,Yoo, Bong-Cheal,Hong, Dong Pyo,Kim, Kyoung-Woong The Korean Society of Economic and Environmental G 1995 자원환경지질 Vol.28 No.6

삼광광산은 옥천대의 서부에 위치하는 백악기의 금-은 광상으로서 선캠브리아기의 화강편마암내에 배태되어 있다. 광산의 금과 은의 품위는 각각 8.4 g/t, 13.6 g/t으로서 가채 매장장은 335.000 MT으로 추정된다. 이 광상은 Au-Ag광물 이외에 유비철석, 방연석, 섬아연석, 황동석, 황철석, 자류철석을 함유하는 열수성 석영맥상광상이다. 광상을 이루는 맥들의 구조를 근거로 할 때 광화작용의 구조규제는 $N40^{\circ}-80^{\circ}E$ 주향과 $55^{\circ}SE$-수직의 경사를 보이는 본맥의 생성, EW주향과 $30^{\circ}-80^{\circ}S$의 경사를 보이는 상반맥의 발달 그리고 $N25^{\circ}-40^{\circ}W$ 주향과 $65^{\circ}-80^{\circ}SW$ 경사를 갖는 국성맥의 생성 등 3가지로 나눌 수 있다. 광상배태의 구조운동은 이 지역에 발달하는 주향이동단층의 최소응력축$({\sigma}_3)$과 관련이 있으며 광맥은 이때에 발생한 열극을 충진한 것으로서 다음과 같이 5단계로 해석된다. (1) NS계의 불연속면에 예각으로 작용한 주응력 $({\sigma}_1)$에 의한 주단층$(F_1)$의 생성, (2) 이와 동시에 발달한 인장파쇄대 $(T_1)$를 충진한 국성맥의 생성. (3) 단층의 계속적인 성장과 $T_1$의 경사가 커짐에 따른 $T_2$(대홍맥)의 계속적 발달, (4) ${\sigma}_1$이 우수향을 보일 때 발달하는 $T_3$(염기성 암맥)의 관입, (5) 역단층의 활동에 의한 국사봉액으로부터 상반액의 생성이 있었던 것으로 보인다. The Samkwang mine is Cretaceous gold-silver-bearing deposits located in the western part of the Ogcheon belt The ore deposits have been emplaced within granite gneiss of the Precambrian age. The Au-Ag deposits are hydrothermal-vein type, characterized by arsenic-, gold- and silver-bearing sulphides, in addition to the principal ore-forming sulphides arsenopyrite, galena, sphalerite, chalcopyrite, pyrite and pyrrhotite. Their proven reserves are 355,000 MT, and grades are 8.4 g Au/t and 13.6 g Ag/t. On the basis of their structural characters, the Au-Ag-bearing quartz veins are classified into three types of ore veins; (1) The Main vein shows $N40^{\circ}-80^{\circ}E$ strike and $55^{\circ}-90^{\circ}SE$ dip, (2) the Sangban vein shows E-W strike and $30^{\circ}-40^{\circ}S$ dip, and (3) the Gukseong vein has $N25^{\circ}-40^{\circ}W$strike and $65^{\circ}-80^{\circ}SW$ dip. The emplacements of the ore veins are closely related to the minimum stress axis $({\sigma}_3)$ during the strike-slip movement of the study area. The ore-bearing veins filled with extension fractures during strike-slip movements were sequentially emplaced as follows: I) When ${\sigma}_1$ operates obliquely to NE-series discontinous surface, the Main fault zone $(F_1)$ developes. 2) During the same time, extension fractures ($T_1$ Gukseong veins) take place. 3) When the fault progress continuously, the existing $T_1$, may be high angle and $T_2$ (Daehung vein) developes continuously. 4) When ${\sigma}_1$ changes to sinistral sense, $T_3$ (basic dyke) occurs. 5) When a reverse fault becomes active, the Sangban vein is branched from the Guksabong vein.

12-MR 제올라이트의 특성분석과 응용

이현구 전남대학교 촉매연구소 1997 촉매학술발표회 Vol.- No.14

분자크기가 다른 암모니아와 피리딘을 탐짐분자로 사용한 TPD와 in-situ FT-IR 분석을 통하여 12-MR 제올라이트의 산특성에 관한 정보와 함께 구조내에서의 산점의 분포에 관한 정보를 도출하였다. 12-MR 제올라이트의 dealumination에 따른 구조적인 변화는 _29Si 및 _27Al Mas NMR로 분석하였다. 12-MR의 기공크기를 요구하는 분자크기가 큰 탄화수소 전환반응의 경우 각 제올라이트내에서의 활성점의 수(산점과 금속 site의 수)뿐만 아니라 구조적 특성에 따르는 활성점의 분포도 함께 고려되어야 함을 알 수 있었다.

직분식 디젤기관 피스톤의 순간온도 측정에 관한 실험적 연구

이재순,이현구 건국대학교 산업기술연구원 1997 건국기술연구논문지 Vol.22 No.-

For the experimental measurement of instantaneous surface temperature of the piston of the DI mono cylinder diesel engine, the instantaneous temperature probes, data acquisition system, and grass-hopper type linkage system were developed. The instantaneous temperatures on the piston crown, lands and skirt were measured and analyzed and the following conclusions can be derived ; (ⅰ) The piston surface instantaneous temperatures had the different time delay by the measuring points and engine speeds. (ⅱ) The engine speeds, the position of the measuring points and the cooling water temperature had effect on the instantaneous temperature amplitude. (ⅲ) The instantaneous temperature swing phenomena appeaned or the temperature profiles of the piston crown, top and second land of ring, but on the temperature profile of the parts of third fand of the ring and skirt, they didn't appeared.

Poster Session : 경계요소법 ( BEM ) 을 이용한 최적 양극위치 결정

이현구,배정효,하태현,김대경 한국부식방식학회(구 한국부식학회) 2001 추계 학술발표회 초록집 Vol.- No.-

류천(柳川) 창연광상(蒼鉛鑛床) 광석광물(鑛石鑛物), 유체포유물(流體包有物) 및 안정동위원소(安定同位元素)

이현구,유봉철,김상중,Lee, Hyun Koo,Yoo, Bong-Cheal,Kim, Sang Jung 대한자원환경지질학회 1996 자원환경지질 Vol.29 No.2

The Yucheon Bi deposits at Cheongha, Gyeongsangbugdo, is of a middle Paleogene (49 Ma) vein type, and is hosted in sandstone and shale of Banyawal formation in Cretaceous age. Based on mineral paragenesis, vein structure and mineral assemblages, two minera1ization stages were distinguished. The stage I consists of quartz with small amount of chlorite, pyrite, epidote, hal1oysite, vermiculite, serpentine and rutile associated with sericitization. The stage II is characterized by Bi minera1ization such as bismuthinite, Bi-Cu-Pb-S mineral, tetradymite, native gold, pyrite, pyrrhotite, arsenopyrite, wolframite, rutile, hematite, sphalerite, chalcopyrite, galena with alteration of sericite, chlorite, K-feldspar, albite and epidote. Fluid inclusion data indicate that fluid temperature and NaCl equivalent wt.% salinity range from 431 to $150^{\circ}C$ and from 19.2 to 0.18wt.% in the stage II. Evidence of boiling during the base-metal minera1ization indicates pressures 241 to 260 bars. Sulfur fugacity($-log\;f_{S2}$) deduced by mineral assemblages and compositions ranges from 5.1 to 5.7atm in early stage, from > 8.4 atm in middle stage and from 13.5 to 19.3 atm in late stage. It suggests that complex histories of progressive coo1ing, dilution and boiling were occurred by the mixing of the fluids. The ${\delta}^{34}S$, ${\delta}^{18}O$ and ${\delta}D$ data range from 2.5 to 3.9%, -0.5 to -4.1% and -29.7 to -47%, respectively. It indicated that hydrothermal fluids may be magmatic origin with boiling and mixing of meteoric water increasing paragenetic time.

R134a 터보냉동기용 압축기 공력설계

이현구,정진희 대한설비공학회 2002 대한설비공학회 강연회 및 기타간행물 Vol.- No.-