• Structural Monitoring and Maintenance
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• 제8권4호
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• pp.309-328
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• 2021

The objective of this work was to develop a methodology for geodetic monitoring on onshore wind towers, to ascertain the existence of displacements from object points located in the tower and at the foundation's base. The geodesic auscultation was carried out in the Gravatá 01 and 02 wind towers of the Eólica Gravatá wind farm, located in the Brazilian municipality of Gravatá-PE, using a stable Measurement Reference System. To verify the existence of displacements, pins were implanted, with semi-spherical surfaces, at the bases of the towers being monitored, measured by means of high-precision geometric leveling and around the Gravatá 02 tower, concrete landmarks, iron rods and reflective sheets were implanted, observed using geodetic/topographic methods: GNSS survey, transverse with forced centering, three-dimensional irradiation, edge measurement method and trigonometric leveling of unilateral views. It was found that in the Gravatá 02 tower the average rays of the circular sections of the transverse welds (ST) were 1.8431 m ± 0.0005 m (ST01) and 1.6994 m ± 0.0268 m of ST22, where, 01 and 22 represent the serial number of the transverse welds along the tower. The average calculation of the deflection between the coordinates of the center of the circular section of the ST22 and the vertical reference alignment of the ST1 was 0°2'39.22" ± 2.83" in the Northwest direction and an average linear difference of 0.0878 m ± 0.0078 m. The top deflection angle was 0°8'44.88" and a linear difference of ± 0.2590 m, defined from a non-linear function adjusted by Least Squares Method (LSM).

• 보존과학회지
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• 제38권4호
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• pp.301-313
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• 2022

We made a Korean white porcelain or Joseon Baekja jar and based on the raw materials used and reproductions of each stage, we aimed to compare and analyze the physicochemical changes of the raw materials such as clay at each manufacturing stage, as well as identify the characteristics and correlations. Although the basic main components of clay and glaze material are similar, their texture becomes denser in the process of bisque firing pottery (Chobeol-pyeon) and glaze firing pottery (Jaebeol-pyeon), and we confirmed that in addition to the tendency of increasing vitrification, low-temperature minerals such as mica and illite gradually disappeared, while high-temperature minerals such as cristobalite were newly created. This phenomenon has also been verified by the rapid decrease in absorption rate while the change in specific gravity was small. In addition, the color was greatly affected by the firing atmosphere, and the yellow-red chromaticity of the raw materials was higher during bisque firing but showed a rapidly decreasing characteristic during glaze firing. The value of magnetic susceptibility, which is related to iron (Fe) component, showed a tendency to decrease in glaze firing pottery. CT images were confirmed as a method that can indirectly estimate the change in the material properties of the object step-by-step for the entire object. In conclusion, the study of manufacturing stages of reproduction can provide basic data for scientific research on the estimation of porcelain and pottery making technology and changes in raw materials.

• 한국정밀공학회지
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• 제20권4호
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• pp.165-173
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• 2003

As the cycling time of new products have become more and more short in recent years, the demand for lowering the cost and reducing the production time becomes stronger. In order for the demand, the rapid prototyping and rapid tooling technology have been used. It has been widely known that RP technology has advantages with fabricating 3-D object having a complicated geometric shape. RP products, however, have a limitation with applying to the real die and mold because soft materials such as resin, paper and wax has been mostly used in RP technology. So in this paper, the RP products have been copied to semi-metallic soft tools using the mixture of metal fillers and epoxy resin. In order to evaluate the effect of the fillers on the characteristics of semi-metallic soft tools, three fillers are used including commercial aluminum powder, cast iron powder recycled by machining chips, and aluminum short fiber made by self-excited vibration technique. Besides, in the case of aluminum powder, the change of characteristics of semi-metallic soft tools is also tested according to the volume fraction of the powder.

• 한국정밀공학회지
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• 제13권1호
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• pp.53-61
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• 1996

A clear understanding of the surface formation mechanism due to cutting is very important to help produce a good quality surface. Much of the roughness along the length of a bar being cut in a lathe can be explained in terms of macroscopic tool shape and feed rate. However, the roughness along the direction of cutting requires a different explanation. The formation of surface roughness is a problem in flow and fracture of materials in the vicinity of the tool edge. On a microscopic scale the cutting edge is rounded because it is impossible to grind a perfectly sharp cutting edge. Even if a perfectly sharp cutting edge were obtained it would soon become dull as a result of rapid breakdown and wear of the cutting edge. A research project is proposed in which in the main object is to model the surface formation mechanism due to cutting. The tool was assumed to be dull, that is, its edge has a finite radius. In order to study the effect of the radius of cutting edge on the surface formation, tools having different cutting edges were used. For orthogonal cutting experiment, cast iron and glass were chosen as brittle materials. Plowing forces acting in the cutting edge were estimated and its effect on the surface roughness was studied by observing the machined surface using optical microscope.

• 박물관보존과학
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• 제13권
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• pp.23-31
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• 2012

본 연구의 대상 유물은 경희대학교박물관 소장 철제유물로 표면에 파라핀(Paraffin)이나 밀납(Bees Wax)으로 추정되는 물질로 코팅이 되어있어 표면이 불투명하며 전체적으로 부식이 심하게 발생되어 표면이 판상으로 두텁게 박락된 상태이다. 따라서 유물 표면에 코팅 처리된 물질을 안전하게 제거하기 위하여, 코팅물질을 제거하기 위한 가역성 실험을 실시하였으며, 실험결과를 토대로 유물에 적용하여 보존처리를 실시하였다. 연구방법은 첫째, 표면에 코팅 처리된 물질의 성분을 알아보기 위하여 FT-IR분석을 실시하였다. 둘째, 각종 유기용제를 사용하여 유물에 코팅된 물질을 가역시킬 수 있는 약품이 무엇인지를 실험을 통해 확인 하였다. 셋째, 가역성실험 결과를 토대로 코팅물질 제거에 가장 적합한 약품을 선정하여 실제 유물에 적용하였다. 연구결과 첫째, FT-IR 분석결과 유물에 사용된 코팅제와 파라핀(Paraffin)은 성분이 같은 것으로 확인되었다. 둘째, 유기용제 중 xylene, toluene, trichloroethylene, methyl alcohol이 파라핀을 용융시킬 수 있는 것으로 확인되었으며 이 중 toluene이 코팅제를 제거하기에 가장 적합 한 것으로 판단되었다. 셋째, 선정된 약품을 사용하여 실제유물에 적용하는데 있어서 미세한 편들을 지지하고 있는 파라핀을 모두 제거하는 것은 유물을 붕괴시킬 수 있으므로 표면을 불투명하게 덮고 있는 부분만을 면봉이나 거즈 등을 이용하는 방법으로 파라핀을 제거 한 후 보존처리를 완료 하였다.

• 공연문화연구
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• 제37호
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• pp.127-155
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• 2018

본고는 울산쇠부리소리의 민속연행적 구조와 그 의미에 대해 고찰하였다. 고찰 과정은 구조의 역사적 배경과 함께 구조적 특징의 주요 요소를 대비하면서 대비 과정에 울산쇠부리소리 각 구조의 의미를 살폈다. 울산쇠부리소리는 1.길놀이 2.고사 3.쇠부리불매소리 4.쇳물내기 5.쇠부리금줄소리 6.아이어르는불매소리 7.성냥간불매소리 8.뒷풀이난장으로 구성 되었다. 이 구성은 길놀이-고사-연행-대동마당이라는 민속놀이의 구조와 일치하며 민속신앙의 기본 구조인 청신-오신-위민-송신과도 유사하며 민속놀이의 길놀이-고사-연행-대동마당의 구조와도 일치한다. 이처럼 울산쇠부리소리는 순차적 병렬구조로 형식화 되었다. 울산쇠부리소리는 삼한시대 이래의 제천의식과도 닮았다. 육체적 희생에 따른 생명 탄생의 쇠부리소리는 새 생명 창조의 송가와 같은 역할도 한다. 울산쇠부리소리에는 한국의 민속문화 뿐만 아니라 좁혀서 경남지역의 민속문화가 그대로 녹아 있음을 알 수 있다. 울산쇠부리소리는 지모신을 향해 삶의 풍요를 기원하는 축제성격도 많다. 철을 생산하는 과정에 흙은 절대적 역할을 한다. 그만큼 쇠부리하는 사람들에게 흙은 신앙적 대상이라고 할 수 있다. 영남지역에 전승되는 민속연희 중에는 삶의 고단함을 넘어서려는 민중들의 애환이 예술정신과 혼합되면서 전승되는 연희들이 많다. 울산쇠부리소리의 경우는 삶의 고단함을 넘어 서려는 바람과 예술정신이 혼합되면서 만들어지고 전승된 경우라고 할 수 있다. 울산쇠부리소리는 전국 유일의 풍철기원(豊鐵祈願)의례다. 풍농과 풍어를 기원하는 의례는 전국에 다수 분포하고 있으나 풍철을 기원하는 울산쇠부리소리 의례는 전국 유일의 희소성을 지닌다.

• 복식
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• 제29권
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• pp.23-38
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• 1996

The purpose of this study was to analyze the characteristics of the Minimal Art represented in the second half 20th century fashion. All the mode of dress worn this century have developed from the stimulus of a chang-ing society fired by new discoveries and a zest for the new and different. It would appear that even more dramatic changes will soon occur in our clothing styles the effects of which will be farreaching. Many of today's styles intended to dress our psyche rather than our bodies and this if fully understood by the new designers whose influ-ence will become increasingly more potent as we approach the new century. The highly developed material civilization resulted in human alienations environmental distruption, l By this fact human being of the 20th century was to overcome social com-plexity. Accordingly their search for simplicity was interested in the 60's style. Especially the formativeness of the 60s style was repre-sented in the second half 20th century fashion. In this paper it was focused that how the characteristics of the Minimal Art was expressed in the second half 20th century fashion. minimalism was a quest for basic elements repesenting the fundamental esthetic values of art. without regard to issues of content. At its most extreme it reduced art not ot an eter-nal essence but to an arid simplicity. "Primary Structure" the most suitable name suggested for this type conveys its two salient characteristics : extreme simplicity of shapes and a kinship with architecture. minimalist works are charcterized by huge dimensions coldness and absolute aesthetic neutrality. minimalist artists ambition is to de-fine through the most rudimentary materials such as plywood galvanized iron aluminum plastic and wood a new order of the space. The environment is just as important as the object itself. Similary the use of new tough materials. such as vinyl metal and plastic at late half of the 20th century fashion related to the formativeness of the Minimal Art. And the style of 20th fashion was holded the internal meanings in common the formativeness of the Minimal Aet thorough the various texture pat-tern silhouette etc.uette etc.

• 한국항해항만학회지
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• 제28권1호
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• pp.43-49
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• 2004

결함검사는 생산공정에 있어서 상품의 디자인과 함께 매우 중요한 부분으로서, 상품의 경쟁력을 높이는데 필수 불가결한 것이다. 만약, 실시간 결함검출이 상품에 대한 어떤 손상도 없이 할 수 있다면, 품질 및 공정의 효율적 관리와 고비용 인력의 절감을 통하여 생산원가를 줄일 수 있다. 본 논문에서는 철판과 같은 표면에 결함이 있는 경우 필요한 정보만을 추출할 수 있는 3가지 공간필터법에 대하여 제안하였고, 공간필터의 특성을 통하여 결함검출 시스템을 구성하였다. 그리고, 최적의 표면결함 계측용 공간필터법을 개발하기 위하여 결함의 크기와 형태, 광도의 크기 및 외부 광간섭 그리고 슬리트의 개수와 같은 파라메타의 변화에 따른 측정 성능을 비교 및 분석하였다.

• 보존과학연구
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• 통권37호
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• pp.17-26
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• 2016

태안 해역의 마도1호선에서는 해양에서 처음으로 총 57점의 죽찰이 출수되었다. 죽찰의 수량이 많아 세척과정 중 유물 상태를 관찰하여 부후정도에 따라 그룹화한 후 순차처리하였다. 또한 치수안정화과정에서 부후가 많이 진행된 죽찰은 PEG 4000, 부후가 많이 진행되지 않은 죽찰은 PEG 2000으로 처리하였다. 진공동결건조 후 PEG 4000으로 처리한 죽찰은 공업용 열풍기를 이용해 표면처리를 실시하였는데 일부는 재색이 많이 어두워졌다. 이를 보완하고자 스팀다리미를 이용하여 표면처리를 실시하였다. 스팀다리미로 표면처리한 죽찰은 재색을 잘 유지하였다. 처리 완료 후 일부 죽찰은 두께에 비해 길이가 긴 편이라 처리 후 무게를 지지해주는 견고성이 많이 떨어졌다. 이런 경우 유물의 이동과정이나 전시 중 유물이 더 손상되는 결과를 가져올 수 있어서 견고성을 더 높여주며 형태유지를 할 수 있는 방법을 찾고자 하였다. 따라서 묵서가 없는 면인 최외층에 100% PEG 2000 용액을 접착제로 사용하여 레이온지를 배접하는 방식을 취하였다. 이는 견고성을 높이면서 형태유지에도 좋은 효과를 보였다.

• 한국의상디자인학회지
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• 제21권4호
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• pp.81-96
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• 2019

The study intends to seek the creative ideas that can satisfy the needs of individual consumers by rediscovering the modern meaning and the artistic value of geometric ornaments engraved on the backside of Danyugyung, which is a traditional Korean pattern. In terms of the study method, the symbolic meaning and formative characteristics of Danyugyung were determined, and the form of its pattern and the geometric characteristics were analyzed. Based on this, Photoshop and illustrations were used to apply the shapes of Danyugyung and internal patterns to the textile designs, and the results are as follows. Firstly, it was found that Danyugyung was associated with the bronze mirror, which was used from the Bronze Age to the Early Iron Age, and was the product of artistic activities and an object and acted as a shamanistic and authoritative symbol of the ruling parties, which were responsible for the acts related to the spiritual world. Secondly, it was discovered that forms of Danyugyung were classified into Jomungyung and Semungyung in accordance with Forms of Danyugyung (造飾), and the formative features of the geometric ornaments that were engraved in great detail on the backside could be found in the images which change according to the form of the inner patterns. Thirdly, with regard to the development of the textile designs utilizing the shape and inner patterns of Danyugyung based on the formative features, it was could discover that the simple shape of Danyugyung presented a value which can be applied as a unique design factor delivering a visual rhythm by attempting to create various harmonies overlapping lines engraved on the inner patterns and the shapes of Danyugyung. Based on the above-mentioned outcomes, the possibility was confirmed that Danyugyung can be used as a novel motif and as a standard unit of patterns for textile design. With future studies, I would like to utilize the unique and diverse images as pattern motif for textile design.