• 제목/요약/키워드: Silver Contents

검색결과 154건 처리시간 0.029초

Effects of additives and post-treatments on emission characteristics of carbon nanotubes field emitters by screen printing method

  • Lee, Duck-Jin;Kim, Sam-Soo;Lee, Yang-Kyu;Chun, Hyun-Tae;Lee, Dong-Gu
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.II
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    • pp.1447-1450
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    • 2005
  • Carbon nanotube field emission display devices were fabricated using screen printing techniques. The CNT pastes are composed of organic binder, CNT, and additive materials such as glass frit, silver or ITO powders. The change in mixing ratio of various organic binders in CNT paste varied the electron emission characteristics. With increasing the contents of additive materials in CNT paste, turn-on field were increased, leading to decrease in electron emission current. The post-treatment process in this study induced the vertical alignment of carbon nanotubes on glass, resulting in the improvement of electron emission uniformity.

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경남(慶南) 양산지역(梁山地域)에 분포(分布)하는 화산암류(火山岩類)의 지구화학적(地球化學的) 특성연구(特性硏究) (Geochemical Characteristics of Volcanics from Yangsan, Kyeongnam Province)

  • 김문영;신홍자;이평구;장영남
    • 자원환경지질
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    • 제21권2호
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    • pp.139-148
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    • 1988
  • The altered volcanic rocks, ranging from tuffaceous to andesitic rocks are widely distributed around the "caldera" area in the southeastern part of Kyeongsang province. The volcanic activity and tectonic movement are assumed to be followed by the hydrothermal activities in the area. From the mineral assemblage the type of alteration can be divided into two types; propylitic and argillic. The average concentration of gold in hydrothermally altered rocks is somewhat lower (about 20 ppb) than that of fresh rocks (45-25 ppb), but for Ag, vice versa. During the hydrothermal process, the concentration of the trace elements Ag, Hg, Co, As, Hf, Sc, Si, Al increased, and that of Na, Rb, K, Au, Mg, Ca etc. decreased. The high anomalous contents of silver for altered rocks range from 4-7 ppm and 1-3 ppm for relatively fresh rocks.

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High $T_c$ Superconductor Applications and Thick Film Preparation

  • Soh, Dea-Wha;Zhanguo Fan
    • Journal of information and communication convergence engineering
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    • 제1권2호
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    • pp.63-66
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    • 2003
  • High $T_c$ superconducting lines will be applied as key materials in the areas of power transmission line; magnetic levitation of vehicle; magnetic separation; magnetic energy storage and marine propulsion. A combination method of electrophoresis deposition and zone-melting for preparation of YBaCuO tape is proposed. The submicron particle powder of YBaCuO made by sol-gel method is used in the electrophoresis process. A 40∼50 ${\mu}\textrm{m}$ thickness of YBaCuO film on Ag plate could be deposited in about three minutes. After deposition the film is rolled and heat treated in order to increase the density and the adhesion of the film to the Ag plate. Silver(Ag) and lead oxide(PbO) were added in the YBaCuO powder in order to reduce its melting point. The YBaCuO coating with controlled Ag and PbO contents was preliminarily zone-melted at about $945^{\circ}C$.

한국장신구의 사치 금제 고찰 (A Study on Luxury Prohibition of Korean Personal Ornaments)

  • 추원교
    • 디자인학연구
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    • 제2권1호
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    • pp.43-62
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    • 1989
  • The luxury is the expression of human being's ornament instinct. In this study, in order to grasp the moulding system of the Korean's personal ornaments, the process of luxury prohibition was reviewed to search for to which direction the ornaments developed in the frame of the prohibited style connected closely to the character of the personal ornaments. The proiod was fixed from the old society to the late Chosun dynasty era. The beginning of the luxury in Korea seems to be the start of the luxury burial at the time of funeral in the age of Koguryo., In the era of Koguryo, 10th year of King Dongmyung (B. C. 28), in the era of Baekje, 27th year of King Koi(260), the prohibition of dress regulation and the style of dress were conducted. The prohibition of personal ornaments in Silla was started from King Bup:Heung, and in the 9th year of King Heung-Duk, the prohibition was conducted in order to correct the luxury of the nobles and set up the social discipline. In the 11 th of King Il-Sung-Ni-Sa-Kum, the use of gold, silver and jade was prohibited in the civilian circles. The prohibition of Silla was succeeded to Koryo era, and in the 7th year of King Kwangjong(956), the system of Baekgwan Gongbok(uniform for government officials) was set up, and the system of Sasek Gongbok(four color official uniform) was set up in the 11 th year of the same King, and the prohibition of the personal ornaments such as crown and band is considred to have been conducted. The prohibition of gold and silver was conducted in the first year of King Sungjong(982), and in the 4th year of King Chungryul(l260), the order of wearing the dress and hat in accordance with the Yusan dynasty and the Mongolian customs were widely circulated in the royal court and vivilian circles. The strong influence of Mongolia made the taste of the traditional personal ornaments laste. The personal ornaments were used for the nobles until the age of the Unified Sillar but even the common people could use them in case they were rich, and such a circumstances made the use of foreign goods inflated. The prohibition of Koryo era was aimed at the prohibition of the foreign goods of luxury, and the classification of the social status.In the age of Chosun Dynasty, the production of gold and silver was feeble indeed but the oute reason of the prohibition was to eradicate the luxurious tendency, elevate the custom of eradicate the luxurious tendency, elevate the custom of thrift, and moreover, the gold, silver and jade were no the products of Korea and the prohibition was conducted but the true reason was afor the tribute tt China and the classification of status. The prohibition of Chosun dynasty was conducted first in the June of the 3rd year of King Taejo The major contents of prohibition was no use of gold, silver and jade, coral, agate, amber, etc. of th, wives of the Dang-Sang-Kwan (Court Nobleman) or their sons and daughters, and the same pheno menon was common even at the time of marriage. The people engaged in the secret trade there of wert beheaded. The personal ornaments in the prohibition were the pendent trinket, Binyo (crossbar) ceremonial ornamental hat, ring, earring, ornamental knife, hat string, hat ornament, belt, etc. Thl luxurious marriage expenses out of the luxury was severe, and lose of the marriageable age because 0 non-preparing the marriage goods was the national evil. The prohibition oC luxury was hard to bt kept to the nobles or rich people, the same as old days and present days. The prohibition of th{ luxury and personal ornaments of Korea had nothing to do with the commons, and it was limited tc the nobles and rich people. The prohibition was aimed to cultivating the custom of frugality by eradicating the luxurious atmosphere, but it was chiefly due to the tribute to the China and tht discrimination of the. status. We can say that the recent personal ornament was the flower of handi craft industry bloomed in the prohibition and regulation.

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스마트 폰 UI의 디자인 철학에 따른 잠재적 사용자 확보 (Securing of Potential Users of Smartphone UI due to the Philosophy of its Design)

  • 김수희;오치규
    • 한국콘텐츠학회논문지
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    • 제16권10호
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    • pp.503-513
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    • 2016
  • 지금까지 스마트 폰 사용자는 Innovator, Early Adopter가 주 고객이었다면 가격 안정화와 인터넷을 즐기는 노인세대가 등장하면서 소외계층에 대한 중요성 및 체계적인 분류와 집중, 전략의 필요해졌다. 그리고 노년계층만으로 국한된 소외계층이 아닌 자신의 의지에 따라 사용자가 될 수 있는 잠재적 사용자에 대한 세분화와 그들을 확보할 수 있는 UI에 대한 분석이 필요하다. 그들을 확보하기 위해 iPhone의 스큐어모피즘, MS 메트로UI, Google 머티리얼 UI가 변하는 과정에서 UI의 기본구성요소(WIMP)가 어떻게 적용되어 왔는지 분석하였다. 분석결과 스큐어모피즘은 완전히 새로운 것이 아닌 사용자에게 외면 받았던 부분을 보완 개선하는 방식으로 천천히 잠재적 사용자를 확보하고 있고 메트로 UI는 터치UI개념으로 처음부터 잠재적 사용자를 고려하였지만 새롭고 획기적인 UI로 그들을 확보하지 못했다. 하지만 Google의 머티리얼 UI는 스큐어모피즘 UI와 메트로 UI의 단점을 보완하고 가성비를 내세워 잠재적 사용자 중 최종수용자까지 확보할 수 있는 UI로 발전하고 있다. 따라서 잠재적 사용자를 확보하기 위해서는 스마트폰을 왜(why) 사용해야 하는지에 대해 사용자 스스로가 공감할 수 있도록 해야 하며 직접적인 대화와 관찰의 피드백을 통해 더욱 체계적인 UI연구로 접근해야 함을 제언한다.

감정 및 정서상태 전이를 위한 감성 컨텐츠 추천 시스템 개발 (Development of Emotion Contents Recommender System for Improvement of Sentimental Status)

  • 박면웅;하성도;정도언;류인균;안승민
    • 감성과학
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    • 제10권1호
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    • pp.1-11
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    • 2007
  • 노인의 일상생활을 편안하고 즐겁게 지낼 수 있도록 도와주는 동반자 로봇의 기능 중 부정적인 감정/정서상태 개선을 위한 Infotainment Service를 소개한다. 노인의 일상생활 중에서 부정적인 감정/정서상태를 정의하고, 이들의 정서상태를 개선할 수 있는 방법들을 모색한다. 인지행동치료에서의 배경지식을 기반으로 노인의 부정적인 정서상태를 개선할 수 있는 애니메이션 클립들을 제작, 편집하여 검증해 보기로 한다. 또한, 검증된 애니메이션 클립들을 이용하여 바람직한 감정상태로의 전이를 위한 감성 컨텐츠를 제공하는 기능을 도출한다. 구체적으로 일련의 실험적 접근방법을 토대로 제작, 편집한 애니메이션 클립을 이용하여 영화의 감정요소를 분석할 수 있는 도구를 설계하고, 기존의 선호도를 고려한 영화추천 시스템을 확장한 감정요소를 고려한 영화 추천시스템을 제안한다.

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둔전(屯田) 및 백전광상(栢田鑛床)에서 산출(産出)되는 에렉트럼의 산출상태(産出狀態)와 조성변화(組成變化) (Mode of Occurrence and Compositional Variation of Electrum from the Dunjeon and Baegjeon Gold Deposits)

  • 이찬희;박희인
    • 한국광물학회지
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    • 제6권2호
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    • pp.94-104
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    • 1993
  • 둔전-백전지역의 금-은, 안티모니 광상에서 산출되는 에렉트럼의 전체 조성범위는 22.6~69.5 atom% Ag로서 각 광상마다 조성의 차이가 있을 뿐 아니라 동일광상에서도 광화시기 및 에렉트럼을 수반하는 광물군에 따라 Ag의 함량이 서로 다르다. 둔전 북광상에서 산출되는 에렉트럼의 조성은 22.6~29.5 atom% Ag의 좁은 범위를 보이며 I기의 것이 II의 것에 비하여 Au의 함량이 높다. 둔전 남광상에서 산출되는 에렉트럼의 조성범위는 33.6~69.5 atom% Ag이고, 백전광상의 것은 35.6~63.5 atom% Ag로서 에렉트럼의 수반광물에 따라 Ag/Au 비가 달라진다. 전반적으로 에렉트럼의 한 입자에서도 Au와 Ag는 조성비를 달리하며 입자의 중앙부에서 외각부로 갈수록 Ag의 함량이 증가하는 경향이 있다. 또한 에렉트럼 정출 당시의 생성온도, 염농도, $fs_2$가 높을수록 에렉트럼의 Ag/Au 비가 낮고 base metal 유화광물과 공존하는 에렉트럼이 Ag 광물과 공존하는 것보다 Ag/Au 비가 낮다. 둔전광산 남, 북광상의 에렉트럼에는 Cu; 0.20~1.92, Bi; 0.35~0367, As; 0.70~1.19 atom%가 포함되어 있으며 Cu는 Ag의 함량이 증가할수록 감소하며 Bi와 As는 Ag가 증가함에 따라 높아진다.

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동진 금·은·동 광산 주변에 방치된 폐석의 환경적 영향 (Environmental Impacts of the Waste Rump in the Dongjin Gold-Silver-Copper Mine)

  • 이무성;전서령;나춘기;정재일
    • 자원환경지질
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    • 제29권1호
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    • pp.45-55
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    • 1996
  • Although the Dongjin Au-Ag-Cu mine had been abandoned since about forty years ago, the results of this study on the dispersion patterns and contamination level of heavy metals in the hydrologic system flowing via the waste rump show that the environmental impacts from the mine wastes are still significant. The stream water in the vicinity of the waste rump is severely acidified (pH 3.8 to 4.4) and highly enriched in various dissolved heavy metals. The heavy metal contents of the stream water and stream sediments are systematically attenuated with increasing distance from the mine area. However, it is worth to note that continuous attenuation of heavy metal contents in both media were reenriched in downstream area more than 800 m apart from the mine because it can be acted as a secondary source of heavy metal pollution. The heavy metals, especially Cd, Cu and Zn of polluted downstream sediments mainly occur in Fe-Mn oxides and organic materials, which indicates that these elements are the main pollutants from the waste rump of the Dongjin mine. The heavy metal contents of crops, such as sesame, perilla, red Pepper and brown rice, collected from the polluted farm land in the downstream area are lower than those of land plants from stream sides, but significantly higher in Cd, Cr, Cu and Zn than those from the unpolluted farm land. Especially, almost all of the crops in polluted farm land have been severly contaminated by Cd (>0.4 ppm). On the other hand, the heavy metal contents of the crops collected from refreshed farm land by means of a soil addition method shows significantly lowered level comparing with those of polluted area, which indicates that a soil addition method was effective for the refreshment of polluted farm land by toxic metallic pollutants. Wormwoods from this area showed very high contents in a11 the heavy metals even in unpolluted area (Cd > 1 ppm, Cr > 1 ppm, Cu > 11 ppm, Pb> 4 ppm, Zn > 55 ppm), indicating that a special caution must be payed when one takes ingest them.

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몽골 숨 톨고이 출토 지류 유물의 과학적 분석 및 보존처리 (Scientific Analysis and Conservation Treatment on the Buddhist Scriptures of Paper Relics Excavated from Sum Tolgoi, Mongolia)

  • 배수빈;양민정;권윤미;유지현;정희원
    • 보존과학회지
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    • 제37권6호
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    • pp.723-737
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    • 2021
  • 본 연구에서는 17세기 '숨 톨고이(Sum tolgoi)' 건축 유적지에서 출토된 지류 경전을 대상으로 재질의 성분 및 구조에 대해 분석하고 이를 바탕으로 보존처리를 진행하였다. 경전은 흙먼지와 이물질이 많고 형태를 알 수 없을 정도로 뭉쳐 있는 상태로 훼손, 결실, 변색 등이 확인되었다. 티베트어로 쓰인 경전은 UV-Vis 분석 결과 쪽과 먹을 종이 바탕에 사용한 것으로, 고대 몽골어 경전은 흑색의 필사 재료가 먹으로 추정되었다. SEM-EDS와 Micro-XRF 분석 결과를 통해 연단(Pb3O4)과 진사(HgS) 혼합 또는 진사(HgS)로 적색 외곽선을 긋고 은니로 경전의 내용을 적었음이 확인되었다. 글씨의 은니는 칼슘과 함께 염화은(AgCl)이 확인되었으며, 황색선에서는 칼슘(Ca)과 석황(As2S3)이 확인되었다. 고대 몽골어 경전의 종이는 초본류 섬유와 인피섬유가 혼합된 특징을, 티베트어 경전은 인피섬유의 특징을 나타냈다. 방사성 탄소동위원소 연대측정 결과, 경전의 바탕으로 사용된 종이가 15-17세기에 제작된 것으로 분석되었다. 경전의 보존처리는 출토된 종이의 형태 변형과 취약함으로 인한 2차 손상을 예방하기 위해 보강지(Pre-coated paper) 제작 및 보강 방법에 대한 실험을 바탕으로 진행하였으며, 처리 후 경전의 보관 및 앞·뒤로 기록된 경전 내용을 확인할 수 있도록 마운팅하고 중성지로 상자를 제작하였다. 이번 보존처리는 보존처리 가역성의 원칙에 따른 새로운 보존처리 재료와 방법을 적용한 연구 결과이다.

가족자원경영의 관점에서 본 코칭(Coaching)의 적용가능성에 관한 연구 (A Study on the Plausible Application of Coaching in the Field of Family Resource Management)

  • 김혜연;김성희;이경희;곽인숙
    • 가정과삶의질연구
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    • 제26권1호
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    • pp.137-147
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    • 2008
  • This study aimed to explore the plausible application of Coaching in the major of family resource management. For this purpose, first, this study reviewed the historical background of the coaching. In the contents, the concepts and principles of coaching were identified. Second, The recent application of coaching to the various areas such as finns, centers, occupation and the academical fields in Korea as well other countries were investigated. Finally, this study connected the nature and emphasis of the family resource management with the philosophy of coaching, which focuses on the internal strength of his/their own change and development in an/a individual/organization. Also, the process of family resource management and coaching models which were regarded as the similar ones in the phases consisted of situation perception, exploring alternatives, planning, implementing and feedback. On the basis of these contexts, this study suggested the plausible classes applied coaching which are able to be introduced in the under-graduated and graduated courses.