• Economic and Environmental Geology
• /
• v.30 no.6
• /
• pp.519-529
• /
• 1997

Volcanic rocks including rhyolitic tuff, rhyolite and welded tuff in the Bupyeong silver mine area form a topographic circular structure which is interpreted as a resurgent caldera. Granitic rocks are emplaced inside and outside area of the circular structure. Pervasive silver mineralization took place in the rhyolitic rock of the southwestern margin of the caldera. Gas and fluid incluson studies were carried out to investigate the petrogenetic evolution and post-magmatic alteration for the rhyolitic and granitic rocks. Gas compositions are characterized by a low $CH_4/CO_2$ ratio (0.004-0.005) for rhyolitic and inside granitic rocks and a high $CH_4/CO_2$ ratio (0.01~0.29) for outside granitic rocks such as the Kimpo and Incheon granites. Homogenization temperature of solid daughter mineral bearing fluid inclusion (III and IV types) and two phase fluid inclusion (I and II types) for quartz in the Bupyeong granites range from 400 to $500^{\circ}C$ and 121 to $514^{\circ}C$, respectively. Salinties vary from 20 to 30 wt% NaCl for type III and IV inclusions and less than 20 wt % NaCl for type I and II inclusions. The fluid inclusion data shows a considerable influx of the meteoric water toward post magmatic alteration stage.

• Journal of Korean Society of Coastal and Ocean Engineers
• /
• v.29 no.3
• /
• pp.154-161
• /
• 2017

The purpose of this study was to investigate the change of length, opening width, and number of openings effecting on topography change around artificial reefs under erosive wave condition. Hydraulic model test was conducted to see sediment transport around the structures and the relation among the installation condition of the artificial reefs, generated velocity, wave deformation, and topographic change was reviewed. Experimental results show that the sediment transport rate was reduced; however, the scour around the structures was increased under the condition of having a single opening compared to the structures having a plurality of openings which shows inversely proportional to the size of Lr/W.

• Journal of Haehwa Medicine
• /
• v.12 no.2
• /
• pp.145-156
• /
• 2004

The purpose of this study was to investigate the inhibitory effect of the aroma therapy of three kinds of aroma oil mixtures on asthma. 1. The percentage of granulocytes/lymphocytes population in mouse OVA-induced asthma lung cells was decreased significantly compared with those of control group. 2. The number of CCR3+ cells, CD4+ cells, CD8+ cells, CD23 and CD3e+/CD69+ in lungs of the mice group treated with M1 were decreased significantly compared with those of control group. 3. The number of IgE+/B220+ cells in the lungs of the mice group treated with M1 decreased significantly compared with those of control group. But the number of B220+ cells in the lunes of the mice group treated with M1 didn't show significant difference compared with those of control group. 4. The number of Gr-1+/CD11b+ cells in lungs of the mice group treated with M1 didn't show significant difference compared with those of control group. But the number of CD11b+ cells in lungs of the mice group treated with M1 decreased significantly compared with those of control group.

• Journal of Korean Society of Occupational and Environmental Hygiene
• /
• v.25 no.3
• /
• pp.418-427
• /
• 2015

Objectives: This study evaluated the association between work related characteristics and hypertension among white collar workers in Korea. Materials and methods: This study was based on the Third Korean Working Conditions Survey(KWCS) conducted in 2011 among workers 15 years of age or older. The total number of individuals included in the analysis was 10,365 white collar workers. Results: The prevalence rate of hypertension was 3.7% among men and 1.0% among women. In multiple logistic analysis the adjusted odds ratio showed statistically effective association to hypertension. For work related characteristics, 1.73 (95% confidence interval, 1.22-2.46) resulted for large-company workers compared with the small-company group, 2.14 (95% CI, 1.22-3.75) for the long working hours group (61 or above) compared with short working hours group(52 or below), 1.78(95% CI, 1.08-2.95) for night shift workers compared with day workers, and 1.54 (95% CI, 1.18-2.01) for high job stress workers compared with low job stress workers. Conclusions: This study showed that it is important for workers to manage their work environment in order to prevent hypertension by modifying their types of work.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2006.05a
• /
• pp.939-942
• /
• 2006

웹 서비스는 오늘날의 인터넷 환경에서 분산되어있고, 이질적인 시스템들 간에 상호운용을 제공하는 새로운 소프트웨어 시스템의 형태이다. 이러한 환경에 있어서 보안은 가장 중요한 이슈 중 하나이다. 공격자는 아무런 인증 없이 사용자의 비밀정보를 노출시킬 수도 있다. 더구나 유비쿼터스 환경에서 사용자들은 웹 서비스를 이용하기 위해 반드시 그들 대신 서비스를 처리할 에이전트들에게 그들의 권한 모두를 혹은 그 중 일부분을 일시적으로 위임해야만 한다. 이것은 사용자의 비밀정보가 에이전트들을 통해 외부에 노출되는 결과를 초례한다. 본 논문에서는 유비쿼터스 환경에서의 안전한 웹 서비스를 위한 위임모델을 제시한다. 우리는 에이전트를 통한 비밀정보의 노출을 막고 서비스의 기밀성과 단언정보의 무결성을 제공하기 위해 XML암호화와 XML전자서명 방식을 이용한다. 그리고 XACML 기반의 웹 서비스 관리 서버를 통해 웹 서비스 제공자들과의 서비스정책의 상호운용을 수행한다. 우리는 역시 멀티 에이전트들 간의 위임을 통해 웹 서비스 제공자들에게 전달될 위임 단언을 정의하기 위해 SAML을 확장 시킨다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2006.05a
• /
• pp.1411-1414
• /
• 2006

유비쿼터스 컴퓨팅환경에서는 다양한 서비스가 존재한다. 사용자들은 수많은 서비스들을 사용하기에 앞서 이들이 어디에 있는지, 어떻게 사용해야 하는지를 알아야 한다. SLP, Jini, 그리고 UPnP 같은 대부분의 현존하는 서비스 디스커버리 (Service Discovery) 기술들은 키워드 매치 방법으로 서비스를 검색한다. 이 같은 방식에서는 사용자가 자신이 이용하고자 하는 서비스에 대한 정확한 명칭을 알고 있어야 서비스를 검색할 수 있다. 그러나 유비쿼터스 환경에서는 매우 다양한 서비스가 존재하고, 사용자들 대부분은 해당 서비스의 전문가가 아니기 때문에 정확한 키워드를 선택하여, 원하는 서비스를 찾는데 어려움이 있다. 시맨틱 웹 분야에서 새롭게 떠오른 온톨로지는 특정 분야에서 사용되는 정보의 구조 혹은 용어에 관한 내용을 사용자들이 공유할 수 있도록 정리해놓은 것이다. 본 논문에서는 이러한 온톨로지의 특성을 이용하여, 사용자에게 이용 가능한 서비스에 대한 정보들을 제공하여 사용자가 다양한 서비스를 쉽게 찾아 쓸 수 있는 방법을 제안하였다. 이 방식은 에이전트간의 온톨로지 교환을 통해서 이루어지며, 서비스 블록(Service Block)이라고 불리는 공간 안에서 수행된다. 또한 서비스 컨트롤러(Service Controller)를 이용하여 서비스를 쉽게 사용할 수 있도록 UI 를 제공한다. 본 시스템을 위하여 JENA2, JADE, Aglet, OWL, 그리고 RDQL 이 사용되었다.

• Economic and Environmental Geology
• /
• v.33 no.1
• /
• pp.1-18
• /
• 2000

Lens shaped and stratiform titanomagnetite orebodies in the Boreumdo iron mine are closely associated with amphibolite which intruded into Precambrian metasediments. Mineralogical and petrochemical analyses of amphilbolite and titanomagnetite ores were carried out in order to interpret the origin of amphilbolite and the genesis of titanomagnetite ore deposits. Amphibolites belong to orthoamphilbolite interms of Niggli value and mineralogy, and are characterized by the occurrence of relict olivine. The amphilbolites responsible for titanomagnetite mineralization have extremely high content of $TiO_2$, ranging from 2.12 to 4.59 wt.% with the average value of 3.43 wt.%. Amphibole minerals in amphibolites are consist mainly of calcic amphiboles such as hornblende, ferroan pargasitic hornblende and tremolite. Most plagioclases belong to andesine ($An_{30-50}$\ulcorner). The metamorphic temperature and geobarometric pressure which are calculated by the calcic amphibole-plagioclase geothermometer and calcic amphilbole geobarometer are estimated to be 537$^{\circ}C$~579$^{\circ}C$(avg. 555$^{\circ}C$) and 2.9~6.6 kbar (avg. 4.5 kbars), respectively. It shows a typical amphibolite facies. Based on the mineral chemistry and petrochemisty of amphibolites and iron ores which are composed mainly of titanomagnetite and ilmenite in the Boreumdo iron mine, the titaniferous oxide melts could be immiscibly separatd from the titaniferous ultrabasic magma. The genesis of the Boreumdo titanomagnetite ore deposits are analogous to the Soyeonpyeongdo and Yonchon iron ore deposits in terms of their mineralogy, mineral chemistry and geologic setting.

• Economic and Environmental Geology
• /
• v.26 no.3
• /
• pp.267-278
• /
• 1993

Serpentinite rocks which are composed mainly of olivine, serpentine and clinopyroxene, cropped out in the anorogenic Kyongsang sedimentary basin of South Korea. The serpentinites contain high content of MgO (36.87~41.99%) and 47~67 ppm Co, 1185~2042 ppm Ni and 979~3582 ppm Cr, which are quite similar to those of ultrabasic rocks such as peridotite and dunite. Isotopic compositions of serpentinites range from -95.5 to -105.7‰ in ${\delta}D$ and +1.7 to 7.1‰ in ${\delta}^{18}O$ corresponding to the continental antigorite type. A wide variation of oxygen isotopic values and $H_2O^+$ content of serpentinites reflect the different water/rock ratios during serpentinization processes. Formation temperature of serpentine minerals are estimated to be unusually high temperature of $488{\sim}646^{\circ}C$ by serpentine-magnetite isotopic fractionation, which belong to continental antigorite type. Calculated ${\delta}^{18}O$ value of serpentinized fluid during serpentinization is suggested that the hydrothermal fluid responsible for serpentinization be originated from the magmatic fluid with a minor influx of paleo-meteoric water in this area.

• Economic and Environmental Geology
• /
• v.27 no.1
• /
• pp.29-39
• /
• 1994

Gabbroic rocks in which titanomagnetite orebodies are embedded were emplaced in Precambrian metasedimentary rocks. Hornblende K-Ar ages for equigranula and gneissic gabbros were obtained to be $1021.8{\pm}14.5$ Ma and $1468.4{\pm}20.8$ Ma, respectively. Biotite-granite has an age of 116.4 Ma, which has corresponded to Daebo granite. Amphibole minerals of the gabbroic rock and the magnetite orebodies belong to calcic amphibole group such as ferroan pargasite, pargasite, and ferro-pargasite. The gabbroic rocks have unusually high content of $TiO_2$ ranging from 0.88 to 6.03 wt.% with an average value of 3.46 wt.% as compared to normal gabbroic rock with 1.32 wt.% in $TiO_2$. Incompatible elements such as Ba and Sr of the gabbros are negatively correlated with $SiO_2$. In contrast, Co and Cr have a positive correlation with $SiO_2$, suggesting a normal differentiation trend of gabbroic magma.

• Journal of Animal Science and Technology
• /
• v.47 no.3
• /
• pp.391-396
• /
• 2005

이 연구는 거세가 제주 수말 비육시 성장 및 육질에 미치는 영향을 구영하기 위해 수행되었다. 24필(16-20개월령 )의 제주마를 12두씩 대조구(비거세)와 거세구에 3반복 (반복 당 4두)으로 배치하여 380일 동안 비육 시험을 실시하였다. 건초와 물은 자유급식 시켰고, 농후사료는 초기 260일 동안 체중의 1.25%, 후기 120 일 동안은 체중의 1.5% 급여하였다. 일당증체량과 사료섭취량은 처리 간 차이가 없었다. 등심단면적은 거세시 다소 증가되었고(P < 0.05), 근내지방도도 유의적 차이는 없었지만(P=0.08) 거세에 의해서 개선되는 경향을 보 였다{2.10 vs 1.59). 거세에 의해서 말고기 등심의 조지방 힘량은 증가된(P < 0.01) 반면, 수분과 조단백질 함량 은 감소되는 경향을 보였다 등심의 육색, pH, 가열감량 및 보수력은 거세 유무에 따른 차이를 보이지 않았 으나， 전단력은 거세구가 다소 감소하는 경향을 보였다(5.2vs 6.4 kg / 1.0-cm diameter core). 말고기 관능평가 에서는 거세구가 비거세에 비해 다즙성 연도 및 향미에서 개선된 경향을 보였다. 이 연구 결과, 제주마를 거 세 비육함으로써 근내지방도를 증가시켜 말고기의 육질을 개선시킬 수 있을 것으로 사료된다.