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A Thermal Model for Silicon-on-Insulator Multilayer Structure in Silicon Recrystallization Using Tungsten Lamp (텅스텐 램프를 이용한 실리콘 재결정시의 SOI 다층구조에 대한 열적모델)

  • 경종민
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.21 no.5
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    • pp.90-99
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    • 1984
  • A onetimensional distribution of the temperature and the heat source in the SOI (silicon-on-insulator) multi-layer structure illuminated by tungsten lamps from both sides was obtained by solving the heat equation in steady state on a finite difference grid using successive over-relaxation method. The heat source distribution was obtained by considering such features as spectral components of the light source, multiple reflection at the internal interfaces, temperature and frequency dependence of the light absorption coefficient, etc. The front and back surface temperatures, which are boundary conditions for the heat equation, were derived from a requirement that they satisfy the radiation conditions. The radiation flux as well as the conduction flux was considered in modelling the thermal behaviour at the internal interfaces. Since the temperature and the heat source profiles are strongly dependent upon each other, the calculation of each profile was iterated using the updated profile of the other until they are consistent with each other. The experimental temperature at the front surface of the wafer as measured by Pyrometer was about 1200$^{\circ}$K, while the simulated temperature was 1120$^{\circ}$K.

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Flame Stabilization Mechanism of a Micro Cyclone Combustor (마이크로 사이클론 연소기의 화염 안정화 기구)

  • Oh, Chang-Bo;Choi, Byung-Il;Han, Yong-Shik;Kim, Myung-Bae;Hwang, Cheol-Hong
    • 한국연소학회:학술대회논문집
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    • 2007.05a
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    • pp.139-144
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    • 2007
  • A micro cyclone combustor was developed to be used as a component of mobile power generator (MPG). The cyclone combustor was designed so that fuel and air were supplied to the combustion chamber separately to prevent a flash-back. The flame shape stabilized inside the micro cyclone combustor was visualized experimentally and the flow field and the combustion characteristics of the combustor were investigated numerically. The global equivalence ratio (${\Phi}$), defined using the fuel and air flow rates, was introduced to examine the overall flow and flame features of the combustor. The flame stabilization mechanism could be well understood using the velocity distribution inside the combustor. For only non-reacting case, it was found that a weak recirculating zone was formed upper the fuel-supplying tube in case of ${\Phi}$ < 1.0. It was also found that small regions that have a negative axial velocity exist near the fuel injection ports for both of non-reacting and reacting case. It was identify that a flame front was stabilized at the negative axial velocity regions near the fuel injection ports.

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Discovery Layer in Library Retrieval: VuFind as an Open Source Service for Academic Libraries in Developing Countries

  • Roy, Bijan Kumar;Mukhopadhyay, Parthasarathi;Biswas, Anirban
    • Journal of Information Science Theory and Practice
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    • v.10 no.4
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    • pp.3-22
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    • 2022
  • This paper provides an overview of the emergence of resource discovery systems and services, along with their advantages, best practices, and current landscapes. It outlines some of the key services and functionalities of a comprehensive discovery model suitable for academic libraries in developing countries. The proposed model (VuFind as a discovery tool) performs like other existing web-scale resource discovery systems, both commercial and open-source, and is capable of providing information resources from different sources in a single-window search interface. The objective of the paper is to provide seamless access to globally distributed subscribed as well as open access resources through its discovery interface, based on a unified index. This model uses Koha, DSpace, and Greenstone as back-ends and VuFind as a discovery layer in the front-end and has also integrated many enhanced search features like Bento-box search, Geodetic search, and full-text search (using Apache Tika). The goal of this paper is to provide the academic community with a one-stop shop for better utilising and integrating heterogeneous bibliographic data sources with VuFind (https://vufind.org/vufind).

A Study on the Composition of Dopo(Long Robe) Found in the Tomb of Bae Cheonjo(1532) - Focusing on the Clothing Found in the Tombs of the Seongsan Bae Clan in the Joseon Dynasty - (배천조(1532) 묘 출토복식 도포의 구성연구 - 조선시대 성산 배씨 문중 출토복식을 중심으로 -)

  • Kim, Jeong-Ae;Lee, Sang-Eun
    • Journal of the Korea Fashion and Costume Design Association
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    • v.18 no.2
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    • pp.35-49
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    • 2016
  • Dopo was the clothing of the Joseon period, which had a strong value of Confucianism. Apart from the kings and princes, government officers and Confucian literati wore Dopo as their official clothing and the uniform. The basic form of Dopo had the straight collar similar to Jikryeong. The difference is the shape of a Mu, which was fixed inside or on the back section along the side line of the front section and made two flaps on the back section. The clothing found in the tombs of Bae Cheonjo (1532~?) are from the mid-16th century to the early 17th century with the clothing style of the early Joseon period. The outer collar of all clothing was the shawl collar except for the Sibok and the inner collar was sewn to this. Two items had square tray collars, which were folded in half and sewn inside in half. The sleeve had a straight inseam from the armhole and its end around the wrist was round and wide. The carp-shaped inseam of the sleeve and wide sleeve indicated a change of sleeve shape. The shapes of the collars and the wide overlapped section of the dual collars demonstrated the shapes of the initial outer robes. The man's outer coats with wide sleeves were mostly cotton-quilted clothing. As described above, this paper examines the basic shapes of outer robes including Sibok, Jikryeong and man's outer coats on the basis of the clothing and artifacts from the tomb of Bae Cheonjo (1532~?) and examined the shapes, composition and features of Dopo. This paper aims to improve awareness of the wisdom and spirit of ancestors in life hidden in the sewing of the three Dopo items and on the importance of historical research.

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The Development of Contemporary Fashion Designs Specialized in the Traditional Costume of the Miao (중국 묘족(苗族) 복식을 특화시킨 현대적 패션 디자인 개발)

  • Lee, Keum-Hee;Yoon, Ji-Won;Han, Jung-Ah
    • The Research Journal of the Costume Culture
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    • v.15 no.5
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    • pp.902-915
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    • 2007
  • This study examines decorative features found in the traditional costume of the Miao, one of the minority groups in China, and adapts them for the development of modern Korean-style fashion designs in order to present visual sample data and to introduce techniques. As for the research method, both literature and visual data are examined: the former includes Miao-related books and theses; the latter, pictures from various documents and real-life data in the possession of Seoul Women's University. The study result is as follows: 1. The basic structure of Miao costume is consist of a Caftan-type upper garment and an accentuated lower garment, pleats skirt although they are decorated luxuriously with various techniques such as delicate embroidery and dyeing. 2. Details and trimmings in modern shapes are developed and presented by adding modern materials to satin, twists, cross-stitch embroidery, stripe patterns, geometrical patchwork, machine pleats and smoking, trimmings of fringe & feather, and the border line decoration of coloration, braids, piping, embroidery, belts tied and wound with colorful threads. 3. Detachable accessaries such as front reinforcement strips, back reinforcement strips, belts, decorative aprons and patchwork skirts are developed and designed by adapting highlighted layered effects. 4. The silver decoration used as an necessary by the Miao is suitable for modern fashion design in futuristic sense. Various techniques and decorative features of Miao costume display their true value all the more in modern fashion stream in which ethnic trends draw much attention.

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A Study on the Pattern and Production of Circular Knit Jacket (환편니트 재킷의 패턴설계 및 생산현황에 관한 연구)

  • Hwang, Song-Lee;Choi, Hei Sun;Lee, Jin Hee
    • Journal of the Korean Society of Clothing and Textiles
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    • v.40 no.5
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    • pp.844-854
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    • 2016
  • In order to understand the current state of production and pattern design of circular knitted jackets, this study selected 11 female clothing brands based from the "2012/2013 Korea Fashion Brand Yearbook" and interviewed the staff in charge of patterns at the companies. Polyester and polyurethane were found to be synthesized and used for the outshell of circular knitted jackets, alternatively natural fabric cotton or wool were synthesized with rayon. As for the structure of circular knitted materials, Ponte Di Roma knitting structure (a modified form of a double knit) was most often used. Surveying the use pattern and the parts for padding cloth, six responded that they used elastic padding cloth. As for circular knitted jackets with inner lining, elastic padding cloth was attached to all parts (front, back, side panel, and collar - except for sleeves) of the basic bodice pattern. Eight responded that they did not use a basic pattern when designing a pattern, which exceeds the majority. All respondents answered yes to the question on if there is any difference in designing a pattern for a woven jacket and a circular knitted jacket. It was found that they designed a pattern that considered shrinkage and elongation, which are the features of circular knitted fabric. Shrinkage and elongation were the features of a fabric material most considered when designing patterns for a circular knitted jacket.

The Analysis of the Maison Margiela's Design Code -Focusing on the Checklist Method- (메종 마르지엘라의 디자인 코드 분석 -체크리스트법을 중심으로-)

  • Mok, So-Ri;Cho, Jean-Suk
    • Journal of Fashion Business
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    • v.19 no.4
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    • pp.135-152
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    • 2015
  • The purpose of this study is to explore the role of deconstruction and creative destruction in Maison Margiela’s fashion design code, which has opened the door to a new wave of innovative design since 1988. Using a combination of theoretical analysis, precedent research, and a review of existing literature, five years of Maison Margiela's works (2010-2014) were evaluated. The analysis shows that Maison Margiela’s Design Code consists of the following key elements: Addition, Extension, Asymmetry, Elimination, Deconstruction, Complanation, and Inversion. Addition refers to act of attaching additional pieces of fabric or clothing on the existing piece. Extension refers to the act of extending the design elements, such as their position or features. Asymmetry means the irregular positioning of left-to right and front-to-back length and features. Deconstruction could be seen in intentionally frayed sleeves, open seams, and tears in the cloth. The element of Elimination was evident in the removal of key pieces of clothing such as a coat, pants, blouse, and a jacket. Complanation refers to the reversion to a two dimensional contemplation of the human form rather than the more obvious 3-dimensional form. Finally, Inversion was used by displaying an inner layer of clothing on the outside or exposing seams or zippers in a way that people are not accustomed to seeing. It also meant that the order of wearing clothes was sometimes inverted, so external layers would be worn within clothing that are traditionally underneath. Maison Margiela’s creations represented a break

A Design Principles and Characteristics of the Garden of Salt Merchant in Yangzhou, China's Ming and Qing Dynasties (중국 명·청 양주 염상원림의 설계원리 및 조영특성)

  • Shin, Hyun-Sil
    • Journal of the Korean Institute of Traditional Landscape Architecture
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    • v.37 no.3
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    • pp.83-92
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    • 2019
  • This study aims to examine at the garden characteristics of salt merchant in Yangzhou, China during the Ming and Qing Dynasties, I looked at the background of garden formation through the literature. In addition, analyzed the garden design method and components of salt merchants. The results were as follows; First, the Yangzhou area in the past has achieved cultural and economic development with the establishment of the ancient Grand Canal. Salt merchants accumulated wealth through trade, and created many gardens under the background of securing materials for create garden through trade, forming political forces through the cultivation of students, and inflow of foreign cultures. Second, salt merchants in Yangzhou asked garden experts to design and create the garden as a place for exchange and relaxation. Also, through the production of landscape changes using Gasan(假山) and a long corridor(長廊), clear classification of spaces using architectural elements, and the placement of buildings in scenic areas adjacent to the water, the gardens with practical and aesthetic functions were owned. Third, the gardens of Yangzhou Salt Merchants have a building-oriented commercial space on the front, and a garden-centered design characteristic on the back. The garden of the commercial zone was built in a simple form using pots, oddly shaped stone, bamboo and fence patterns in the remained space, focusing on the front of the building. The garden at the back formed a curved waterway connected to the canal is refracted across the garden. The garden also features piled stones(疊石), stone bridges and ship-shaped stone building(石舫). In addition, the design reflected the introduction of trees that take into account the climate and color contrast of Yangzhou province, pavement of various materials and patterns.

Electrical properties of n-ZnO/p-Si heterojunction photovoltaic devices

  • Kang, Ji Hoon;Lee, Kyoung Su;Kim, Eun Kyu
    • Proceedings of the Korean Vacuum Society Conference
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    • 2016.02a
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    • pp.306.1-306.1
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    • 2016
  • ZnO semiconductor material has been widely utilized in various applications in semiconductor device technology owing to its unique electrical and optical features. It is a promising as solar cell material, because of its low cost, n-type conductivity and wide direct band gap. In this work ZnO/Si heterojunctions were fabricated by using pulsed laser deposition. Vacuum chamber was evacuated to a base pressure of approximately $2{\times}10^{-6}Torr$. ZnO thin films were grown on p-Si (100) substrate at oxygen partial pressure from 5mTorr to 40mTorr. Growth temperature of ZnO thin films was set to 773K. A pulsed (10 Hz) Nd:YAG laser operating at a wavelength of 266 nm was used to produce a plasma plume from an ablated a ZnO target, whose density of laser energy was $10J/cm^2$. Thickness of all the thin films of ZnO was about 300nm. The optical property was characterized by photoluminescence and crystallinity of ZnO was analyzed by X-ray diffraction. For fabrication ZnO/Si heterojunction diodes, indium metal and Al grid patterns were deposited on back and front side of the solar cells by using thermal evaporator, respectively. Finally, current-voltage characteristics of the ZnO/Si structure were studied by using Keithly 2600. Under Air Mass 1.5 Global solar simulator with an irradiation intensity of $100mW/cm^2$, the electrical properties of ZnO/Si heterojunction photovoltaic devices were analyzed.

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A Study on Trompe-1'oeil Expressed in Modern Fashion (현대패션에 나타난 Trompe-l'oe il(트롱쁘-뢰이유, 눈속임)에 관한 연구)

  • 손영미;조영아
    • Journal of the Korean Society of Costume
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    • v.52 no.4
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    • pp.155-171
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    • 2002
  • Trompe-1’oeil technique strategically conceived with a view to effectively realize creative ideas among the expression techniques of fine arts style has provided the driving force in development of fine arts and has continuously influenced development of the modern fashion pursuing unique individuality. The purpose of this study is to open a new horizon for the development of fashion as a practical art, and to seek the expansion of the creative domain and ultimately to contribute to the creation of original and creative fashion by examining the interrelationship between Trompe-1’oeil, which has long been utilized and positioned as one of the leading fine arts techniques with the advent of surrealism in the beginning of the 20th century and the modern fashion. The study is focused first on finding out how Trompe-1’oeil technique originated in connection with researching the fashion of Trompe-1’oeil and on analysing the techniques of expression, and then on investigating into Elsa Schiaparelli, pioneer of Trompe-1’oeil technique to identify her influences, and finally on classifying clothes employing Trompe-1’oeil technique by their expression method to examine how Trompe-1’oeil technique has been applied to modern clothes. As for the research method, the researcher has referred to fine arts books, collection of pictorial records and the like to gain conceptual understanding of Trompe-1’oeil and to examine the expression method and the features of Trompe-1’oeil, and collected and referred to fashion books and fashion marazines to understand Elsa Schiaparelli and the expression tendencies of Tromprf-1’oeil in modern fashions. Particularly, the researcher has attempted to search the correlation between modern fashion and Trompe-1’oeil technique. As a result of this research, the researcher has managed to classify Trompe-1’oeil technique expressed in modern fashion into ‘harmony’, ‘application of the human body’, ‘front and back’, ‘surface and inside’. ‘completion of the incomplete’ and ‘detail.’ The researcher has also noted that Elsa Schiaparelli, a surrealist first applied Trompe-1’oeil technique to clothes and confirmed that quite a few avant-garde clothes designers following Elia Schiaparelli, by using Trompe-1’oeil technique in clothes, recently recreate fresh feelings.