• 자원환경지질
• /
• 제41권5호
• /
• pp.563-575
• /
• 2008

아프리카 중서부 말리의 부구니 지역에 대해 약 $2,000\;Km^2$를 대상으로 정밀탐사지역을 정하기 위하여 광상탐사와 지화학탐사를 수행하였다. 이 탐사의 결과, 아연-주석-금-은 광화작용에 대한 높은 이상대가 콜라니와 리아라코 지역에서 발견되었다. 수계 표사 시료에서 수집된 중사의 아연 함량은 14-8,600ppm으로 나타난 반면에 이 지역에서 아연의 평균값은 543 ppm이고 한계값($x+2{\sigma}$)은 1,000 ppm으로 나타났다. 일반적으로 아연 이상대는 주석과 몰리브덴 이상대와 연관된다. 그러나 이상대 지역은 다음에 수행 할 이런 이상대들에 연관된 일차 아연과 귀금속 광상의 추적을 위한 정밀탐사 지역을 선정하였다.

• 박물관보존과학
• /
• 제17권
• /
• pp.17-42
• /
• 2016

신라시대 대형 고분인 서봉총에서 출토된 과대 1점과 요패 8점을 성분 분석하였다. 구성품을 크게 금판, 못, 영락, 금사 등으로 구분하여 성분비를 검토한 결과 모두 서로 다른 순도를 지닌 금제로 제작되었다. 과대에 사용된 금판은 순도 17~18K, 19~20K 두 가지로 구분되며, 못은 약 20K, 영락과 금사는 대부분 18K의 금으로 제작되었다. 요패에 사용된 금판 역시 대부분 17K~19K이며, 연결고리는 17~19K, 못은 17~20K, 영락과 금사는 약 19K의 금제로 확인되었다.

• 자원환경지질
• /
• 제32권5호
• /
• pp.421-434
• /
• 1999

Gas and chemical compositions of fluid inclusions in quartz some of Au-Ag, Pb-Zn-Cu and W-Mo mineral deposits in South Kores were analyzed to interpret the sources of ore fluid and the depositional condition of ore minerals in base-metal ore deposits. Fluid inclusions in quartz from the gold and silver mines are characterized by $CO_2$ rich fluids which have a wide range in $CH_4 \;and\; CO_2$ contents ($CH_4/CO_2$=0.001-0.225). The $CO_2$ rich but $CH_4$-poor nature of the fluid reflects the high fo2 condition during the mineral precipitation. The C2H6 is detected in hydrothermal quartz vines in metasedimentary rocks from the Jeonjoo-il, Youngbokari and Taechang mines. The $CH_4 /CO_2$ rations in W-Mo bearing quartz veins range from 0.005 to 0.214, which is similar with those in Au-Ag mines. However, skarn formation stage. Fluid inclusions, A relatively good correlation between Na and Cl contentrations reflects varible salinity in the fluid inclusion, it is suggested that the chemistry of promary magmatic hydrothermal fluids has changed during post-magmatic alteration and/or wall rock alteration processes. The content of gas compositions also depends on the kinds of country rocks, supporting above conclusion.

• 한국전기전자재료학회논문지
• /
• 제29권10호
• /
• pp.647-651
• /
• 2016

The power relay can easily control high voltage and high current through metallic contacts. In addition, it has the advantage in reasonable price. So it has been used in many applications. But the power relay has a weak point by mechanical movements. These mechanical movements cause the bouncing phenomenon. Arc and bouncing phenomenon are the main causes of electric abrasion and material erosion. In this study, mechanical repetitive experiments and repetitive experiments in electrically connected state are conducted. Then these two experimental results in terms of bouncing phenomenon and changes in the contact surface are compared. In all number of repetitions, contacts in an electrically connected state cause smaller number of bounce. Also, It has lower contents of silver on eroded surface than the other. The experimental results would be helpful to the further study of contacts life span.

• 여성건강간호학회지
• /
• 제12권4호
• /
• pp.316-325
• /
• 2006

Purpose: The purpose of this study was to develop a Critical Pathway for Uterine Artery Embolization patients. Method: There were 6 steps that were taken. Step 1 was selecting a diagnosis, and Step 2 was organizing a development team consisting of 7 experts. Step 3 analyzed the medical records, and Step 4 drew up a preliminary Critical Pathway. Step 5 tested the clinical validity of the preliminary Critical Pathway, and Step 6 developed the final Critical Pathway. Result: The contents of the medical practices observed in the medical records were investigated in seven areas: monitoring/assessment, treatment, medication, diet, activity, consults, and education/discharge plan; and a total of 73 items was identified. The validity of the 73 items was examined by a group of specialists. 68 items were adopted, 4 items revised, 1 item removed, and 1 item was added. Using the results, a preliminary Critical Pathway was drawn up. According to the results from examining the clinical validity of the preliminary Critical Pathway with five patients for five weeks, 3 items which showed discrepancy were revised and another 3 items were added. Then, the final Critical Pathway was completed. Conclusion: This Critical Pathway needs to be clinically applied and continuously to measure its effects in terms of the length of stay, cost.effectiveness, and the patients' and staffs' satisfaction.

• 자원환경지질
• /
• 제17권2호
• /
• pp.91-100
• /
• 1984

The Gwangyang gold deposits geologically consist of granitic gneiss, metatectic gneiss and porphyroblastic gneiss which correspond to Jirisan gneiss complex. The formations of Gyeongsang system lies unconformably on these gneisses and are intruded by diorite, porphyritic andesite and Bulgugsa granites. Goheung districts are composed of quartz schist, andesitic rock, tuff and granite. The Gwangyang gold deposits are gold bearing fissure filling veins. The vein thickness varies from 15cm to 40cm and they consist of 7-10 layers in parallel. The Goheung copper deposits are sulphide bearing quartz veln which filled the fracture in andesitic rock and biotite granite. The contact zone of these rocks is partially altered. The mineral paragenesis of the Gwangyang and Goheung districts is pyrite, arsenopyrite, pyrrhotite, chalcopyrite, sphalerite, galena, sericite, quartz and calcite. The variation trends of FMA and A'KF triangular diagrams and the differentiation index (norm, Q + Or + Ab) versus oxides diagrams is similar to the Gyeonsang basin igneous rocks. From the trace element analysis of 10 samples of country rocks, wall rocks and veins, the distribution of copper and lead contents display a correlative distribution pattern in relation to gold and silver. Homogenization temperature of fluid inclusions range from $200^{\circ}C$ to $270^{\circ}C$ in quartz from the Gwangyang gold vein and the size of fluid inclusion range from 0.01mm to 0.04mm. The fluid inclusions are mainly one or two phase and the filling degree of the inclusions varies from 85 to 95.

• 한국지역사회생활과학회지
• /
• 제20권4호
• /
• pp.469-479
• /
• 2009

New rural village development programs have been implemented, and rural village land use is expanded to encompass green-tourism, citizen and silver domicile space because of the internal and the external changes in the agricultural environment. This study was conducted to propose the evaluation index for retiree rural village development project issued by Ministry for Food, Agriculture, Forestry and Fisheries. The evaluation index was consisted of four categories (population, economic, environment, and living), which were consisted of 35 variables. The relative weight for 35 variables was calculated based on the questionnaire survey from the experts and AHP (Analytical Hierarchy Process). Growth rate of population in population criteria, job creation by exterior inflow in economics criteria, improvement of exchange between urban and rural in life criteria, and the flood outbreak in environment criteria were the most important contents of 35 variables. These results are consistent with the objectives of retiree rural village development project, and indicate the need of prevention the negative sides by implementation of the project.

• 지구물리
• /
• 제2권3호
• /
• pp.225-233
• /
• 1999

암석의 비저항값은 암석 자체의 성질뿐만 아니라 유체의 종류, 온도, 물 포화율, 접촉상태, 유도분극, 측정기기 및 사용전원의 주파수 등, 여러 요인에 의하여 영향을 받는다. 이 연구는 암석의 비저항을 정확하고 정밀하게 측정하기 위한 기초 연구의 일환으로서, 비저항 실측자료를 비교 분석하는 과정을 통하여 비저항 측정에 영향을 주는 다양한 요소들을 추적하고, 아울러 비저항 측정에 있어서 최적의 환경 조건을 찾고자 하였다. 특히 온도, 물 포화율, 시료와 전극의 접촉상태, 측정 주파수의 영향 등이 종합적으로 분석되었으며, 전도성 접착제와 절연 테이핑 방법 그리고 시계열 비저항자료의 이용이 비저항 측정의 정확도와 정밀도 향상에 크게 기여할 수 있음을 보였다.

• 한국인쇄학회지
• /
• 제30권2호
• /
• pp.1-12
• /
• 2012

In this experiment, we have manufactured thermal-curable silver pastes for direct printing. And to enhance conductivity, printability, adhesion and hardness during polymer direct-gravure prints, we have manufactured Ag pastes by adding variety of filter contents. Then we have investigated characteristics of rheology in paste according to the gravure printability and the properties of printed conductive patterns. Depending on a variety of Ag powder, there was a big difference in sharpness of printed pattern. And also by the use of carbon, there was a big difference in amount of solvent used, conductivity and in hardness. We could improve doctoring and the sharpness of a pattern by adding Ag paste in carbon particle, but as we have used nano-sized particle, there was an increase in the amount of solvent used and also we have found out that it gives a bad effect as adhesive and hardness becomes weaker. Even though Ag particle has the same spherical shape, the surface treatments could differ from one another. And by the appropriate choice and with the suitable combination of Ag powder, excellent printability and conductivity could be obtained.

• 한국의류산업학회지
• /
• 제23권4호
• /
• pp.439-447
• /
• 2021

The purpose of this study is to examine the evolution of precious metal and gem stores, and to derive the characteristics of this period from the government, industry, and consumers. Correspondingly, the contents of daily newspaper articles during this period were analyzed using Naver's news library search engine. The historical development process is as follows. Before the Korean War, precious metal jewelers operated in Jongno, Namdaemun, and Chungmuro, dealing with gold, silver, and platinum. Large stores not only sold jewelry and watches, but also functioned as craftsmen and watch repairers. After the war, a shopping district for precious metals and jewelry was formed around Midopa Department Store. By 1963, the number of jewelry stores in Seoul increased to about 130 and to about 280 by 1966. The characteristics of the government, industry, and consumers are as follows. The government continued to implement a policy to regulate the precious metal and jewelry industry. Despite challenges, the industry exhibited the potential for foreign currency acquisition and growth through domestic amethyst. Consumers could access information regarding precious metal jewelry in daily newspapers. In the late 1960s, various types of jewelry were distributed in line with an increase in income levels.