• 자원환경지질
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• 제27권5호
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• pp.441-449
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• 1994

The tourmalines distributed in the Sangdong area belong to the dravite-schorl series in terms of the cell dimensions and the chemical compositions. Geochemical characteristics of tourmalines indicate that Naedeogni granite and pegmatite appear to be derived from Li-poor and Fe-riched aplite rocks, but Nonggeori granite is derived from Ca-poor or Si-riched pelitic rocks. The Mg+Fe contents of tourmaline in Naedeogni granitoids are decreased from the granites to the pegmatites with the Fe contents increased while Mg contents decreased. It indicates the differentiation during the crystallization of tourmalines. These phenomena are coincided with the chemical variations from cores toward rims of the zonal tourmalines. Such a compositional variations in Nonggeori granite can not be observed.

• 대한의용생체공학회:의공학회지
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• 제14권3호
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• pp.283-290
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• 1993

In thls study, the effects of the composltional change of cast Ni-Ti alloys on its characteristics including mechanical properties, phase transformation temperature, and ion releasing rate were investigated. brittle:behavior was shown in the stress-strain curve of the alloy containing low Ti content (Ni-44.0%Ti). By increasing the Ti content, the trend in stress-strain curves changed from that of superelasticity to that of shape memory effect(Ni-44.4%Ti, Ni-45.1%Ti, Ni-45, 5%Ti). Phase transformation temperature ($A_f, {\;}M_5$ point) increased with increasing the Ti content. lon releasing rate of four types of Mi-Ti alloys was very low compared to that of the dental commerical Ni-Cr alloy.

• 한국자기학회지
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• 제5권5호
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• pp.805-809
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• 1995

In order to widen the band-width of ferrite absorber, compositional effect on the complex permeability of Ni-Zn ferrite and the structure of grid absorber were studied. From the experimental results, we could determine the optimum composition composition of Ni-Zn ferrite and the structure of grid absorber. Also, we manufactured grid absorber and investigated its microwave absorbing characteristics. Calculation shows that the ferrite frid absorber suppresses reflection ${\leq}-20dB$ from 30 MHz to 700 MHz and the conventional ferrite tile absorber suppresses reflection ${\leq}20dB$ in the frequency range of 30 MHz-400 MHz. It was found that the microwave absorbing performance of the ferrite grid absorber was superior to the ferrite tile absorber.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2011년도 제40회 동계학술대회 초록집
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• pp.159-159
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• 2011

Among the semiconductor ternary compounds in the I-III-$VI_2$ series, $CulnS_2$ ($CulnSe_2$) are one of the promising materials for photovoltaic applications because of the suitability of their electrical and optical properties. The $CuInS_2$ thin film is one of I-III-$VI_2$ type semiconductors, which crystallizes in the chalcopyrite structure. Its direct band gap of 1.5 eV, high absorption coefficient and environmental viewpoint that $CuInS_2$ does not contain any toxic constituents make it suitable for terrestrial photovoltaic applications. A variety of techniques have been applied to deposit $CuInS_2$ thin films, such as single/double source evaporation, coevaporation, rf sputtering, chemical vapor deposition and chemical spray pyrolysis. This is the first report that $CuInS_2$ thin films have been prepared by Aerosol Jet Deposition (AJD) technique which is a novel and attractive method because thin films with high deposition rate can be grown at very low cost. In this study, $CuInS_2$ thin films have been prepared by Aerosol Jet Deposition (AJD) method which employs a nozzle expansion. The mixed fluid is expanded through the nozzle into the chamber evacuated in a lower pressure to deposit $CuInS_2$ films on Mo coated glass substrate. In this AJD system, the characteristics of $CuInS_2$ films are dependent on various deposition parameters, such as compositional ratio of precursor solution, flow rate of carrier gas, stagnation pressure, substrate temperature, nozzle shape, nozzle size and chamber pressure, etc. In this report, $CuInS_2$ thin films are deposited using the deposition parameters such as the compositional ratio of the precursor solution and the substrate temperature. The deposited $CuInS_2$ thin films will be analyzed in terms of deposition rate, crystal structure, and optical properties.

• Journal of the Korean Wood Science and Technology
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• 제37권4호
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• pp.381-387
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• 2009

본 연구는 암모니아수 침지 처리가 옥수수대의 화학 조성과 효소당화 특성에 미치는 영향에 대하여 연구한 것이다. 암모니아수 침지에서 처리 온도와 시간이 본 연구에서 주요 변수였다. 무 처리 분말과 침지 처리 분말의 전체 조성 분석과 탄수화물 조성 분석 결과, 3가지 다른 수준의 암모니아수 침지 조건($140^{\circ}C$ - 1 h, $90^{\circ}C$ - 16h 및 $50^{\circ}C$ - 6일)에서 고온 단기간 처리가 더 많은 양의 자이란과 리그닌을 용출시켰다. 암모니아 침지에 의한 자일란과 리그닌 용출 제거 효과가 고온 침지 처리 된 옥수수 줄기 분말에서 상업용 셀룰라아제를 사용하는 셀룰로오스와 자이란의 효소 당화를 촉진시켰다.

• 기술혁신연구
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• 제7권1호
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• pp.14-35
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• 1999

This paper presents the relationship between the pace of structural change and the magnitude of employment growth in the manufacturing sector in OECD countries. To measure the pace of structural change, the compositional change index in value-added in manufacturing sector is introduced. For mid to long-term there seems to be a positive relationship between the pace of structural change and the magnitude of employment growth. In those countries with higher value of the compositional index, the employment growth in manufacturing sector was generally higher. To analyse the characteristics of structural change in manufacturing sector, this paper classifies manufacturing industries into groups: one based on technology, one on orientation, one on wages and one on skills. The international comparison of manufacturing sector's employment patterns based on above four classifications are presented. International comparison suggests that Korean manufacturing sector move into jobs with more skills and knowledge The structural change of SMEs and large firms are compared based on above four classification methods. It is shown that SMEs' employment in low value sectors, that is low-technology, labor-intensive, tow-wage, and unskilled sectors, have risen faster than SMEs' employment in high-technology, science-based, high-wage and skilled sectors. Large firms' employment have been mainly increased in high value sectors. However, the employment growth of both large and small firms have been concentrated on production worker-intensively-using sectors, i.e. unskilled sectors. This widened the wage differential of production workers by firm sizes and concurrently led to severe shortage of production workers for SMEs, which has little ability to pay high wage to production workers because they usually belong to low-wage sectors. Korea need to push SMEs forward to high value sectors. The premise of that is, however, to pull large firms out of production worker-intensively-using sectors.

• 문화기술의 융합
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• 제8권3호
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• pp.43-50
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• 2022

<잊혀진 영상>은 클로드 드뷔시(Claude Debussy)의 피아노 독주곡으로서 1894년에 작곡되었으나 미상의 이유로 1977년이 되어서야 비로소 출판되었다. 흥미롭게도 총 세 곡으로 구성된 작품 중 제 2곡은 1896년 2월 파리의 일간지 '르 그랑 저널(Le Grand Journal)'을 통해 독립적으로 발표되었으나, 제 1곡과 3곡은 자필 악보 상태로 남아 있다가 1977년 뒤늦게 출판되었다. 이러한 이유로 본 작품은 아직까지도 피아노 연주가들과 음악 애호가들에게 잘 알려지지 않은 작품으로 남아있다. 이에 본 논문에서는 이러한 작품의 출판 시기, 작곡 배경에 대해 먼저 고찰해보고, 작품의 작곡 양식적 특징을 선율, 화성, 형식의 측면에서 면밀하게 분석하여 본다. 본 작품을 구성하는 세 곡은 다양한 교회 선법, 온음음계 그리고 전통적 조성 체계의 회피를 통한 화성적 어법의 확대를 보여주며 드뷔시가 피아노 독주곡에 즐겨 적용하였던 3악장 구성의 틀을 제시한 최초의 작품으로 볼 수 있다. 이러한 드뷔시 피아노 독주곡 양식에 대한 음악어법상의 이해와 함께, 잘 알려지지 않은 본 곡이 차지하는 음악사적인 가치에 대한 관심이 증대될 것을 기대한다.

• 응용통계연구
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• 제36권5호
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• pp.473-488
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• 2023

국내 대표 관광지인 강원도는 관광수요가 일부 지역에만 편중되어 있어 지역별로 다른 관광추이를 보인다. 따라서 각 지자체의 관광 활성화 방안 수립과 지역간 균형발전을 위해 각 지역의 관광 특성을 파악하고, 연도별 관광패턴을 비교하는 것이 중요하다. 본 논문에서는 최근 4년간의 강원도 관광 자료를 이용하여 지역을 군집화하고, 군집별 관광패턴을 Jeon 등 (2021)이 제안한 비유클리디안 가법모형으로 분석하였다. 이때, 연령대에 따른 방문자 수 비율과 방문지 유형에 따른 내비게이션 검색 수 비율을 공변량으로 하고, 업종별로 구분된 관광지출액 비율을 반응 변수로 하였다. 모형의 추정을 위해 평활역접합 방법과 성분별 띠폭 선택법을 이용하였다. 그리고 삼각 도표를 통해 추정된 모형을 시각화하고, 군집별로 적합 오차에 대한 예측 오차비율을 비교하여 연도별 관광패턴 변화를 확인하였다.

• 한국주거학회논문집
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• 제12권4호
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• pp.195-203
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• 2001

The purpose of this study is to analyze the characteristics of Mario Botta's residential design. The characteristics of Mario Botta's residential design are following as : 1. The residential design of Mario Botta planed from 1960' to 1970's is based on the style composition method of modern design, specially by the influence of Le Corbusier and Louis I. Kahn. Botta's residential design of the 1980's is generally affected by A. Palladio, and is characterized as the representation of classic standard. The residential design of the 1980's shows the establishment level of Mario Botta's residential design, and produces particular Botta's facade. 2. The characteristics of Mario Botta's spatial composition on residential design could be implicated by the spatial distribution of each floor which is divided by three floors, simple and primitive volume which has a symmetry, opening through the massive elimination n the center of front, double skin, the contrast between void and solid, and the inflow of light through the top-light. 3. Most Botta's residential designs have Loggia in the center of facade working as a buffer space which joins outside and inside space together. They also lead the spatial continuous flow. The inside space is combined by the light coming through top-light and vertical opening. 4. They have high accomplishment in complicating details. They show the outside design of a horizontal belt according to the module of concrete block and the decorated design using compositional materials such as an unevenness piled up askew concrete block .

• Journal of Forest and Environmental Science
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• 제31권2호
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• pp.126-135
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• 2015

This study was conducted to evaluate the ecological characteristics of forest cover types which were classified by cluster analysis in the natural forest of Sobaeksan on the basis of the vegetation data from the point-quarter sampling method. Recognized forest cover types were 1) Mixed mesophytic forest, 2) Taxus cuspidata forest, 3) Fraxinus rhynchophylla-Quercus mongolica forest, 4) Betula ermanii forest, 5) Pinus densiflora forest, 6) Quercus mongolica mixed forest, and 7) Quercus mongolica pure forest. For those of classified types, the species composition was expressed by importance value (IV) to describe the community floristically. The species diversity was quantified using the Shannon's diversity index. The results showed that the forest cover types were characteristically different from one another in growing species and compositional rates, depending upon the type which was formed by a number of similar vegetational sample points. Species diversity indices (H') of total and overstory both were the highest in the mixed mesophytic forest (3.530 and 2.880, respectively), and lowest in the Q. mongolica pure forest (2.122 and 0.000, respectively) with only one canopy species. The highest species diversity in the mixed mesophytic forest may due to the relatively high species richness and evenness in the forest cover types. The description on ecological characteristics were suggested to understand the formation and development of forest cover types in this study area.