• Title/Summary/Keyword: IR communication

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Thermal Characteristics Investigation of Space-borne Deployable Mesh Antenna according to the Mesh Weaving Density (OPI) (메쉬 제직 밀도(OPI)에 따른 우주용 전개형 메쉬 안테나의 열적 특성 분석)

  • Bong-Geon Chae;Hye-In Kim;Hyun-Kyu Baek;Hyun-Ung Oh
    • Journal of Aerospace System Engineering
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    • v.17 no.4
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    • pp.1-9
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    • 2023
  • Recently, as Synthetic Aperture Radar (SAR), communication, and signal surveillance missions of spacecraft have become more advanced, research has been actively conducted on the deployable large mesh antenna system with excellent storage efficiency compared to the deployment area, and light weight. Deployable Mesh antennae are characterized by an increase in the number of Openings Per Inch (OPI), which is a measure of mesh weaving density as the mission frequency band increases, and this OPI change directly affects the thermal optical properties of the mesh antenna, so research on this is required. In this paper, to verify the thermal relationship between the optical properties of the mesh and antenna reflector, thermal sensitivity analysis between the mesh and the antenna reflector is performed by in-orbit thermal analysis with various optical characteristics of the mesh based on existing overseas research cases. In addition, the temperature gradient effect of the mesh reflector is analyzed.

Corporate strategy in Korean Contents production industry (국내 방송 콘텐츠 제작사의 기업 전략 특성)

  • Lee, Moon-Haeng
    • Journal of Digital Convergence
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    • v.20 no.1
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    • pp.155-163
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    • 2022
  • The ecology of Korean Production Industry has been changing rapidly. Small & medium size independent production companys have been shrinking in market share while big size production companys are taking larger share than before. This study intends to show the dramatic change of the ownership in Korean production industry and the consequencies. When considering positive development of production industry, small & medium size independent production companys should play important roles but the environment of the industry is not easy for them. The implication of this study is that small & medium size independent production companys have to search for survival strategies to adapt environmental change.

A Study on Folkcraft Processing Art and Designing Development-Especially Centerin garound Plant-Stalk Works (한국민속공예제품 가공기술 및 디자인 개발에 관한 제고방식-초경공예제품을 중심으로)

  • 남상교
    • Archives of design research
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    • v.2 no.1
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    • pp.13-41
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    • 1989
  • The raw materials for plant-stalk-folkcrafts are cultivated in the whole country. Most Korean farmers, to increase their income, have produced mats and containers with various plants as a side line from very long ago. At first, they began from the instruments of life and then made folkart and at last get to manu\ulcornerfacturing of industrial folk craft. The folkcrafts, made of plant-stalk, which could nor conform to changing society, are partly declined and partly handed down as the traditions. The social change today, however, makes living conditions more speedy and multisided, accordingly the characteristics of demand also become in\ulcornerdividual and various. While the demend is various like this, suppliers cannot answer demendants' requirements, and consequently, the demand and profit cannot be increased. According to this, the purpose of this study is set up to give an answer to the situation that is at the traditional standstill, through an examination of the motives. I. The crafts of plant-stalk are made only in an organized relationship between agriculture, industry and art as it is compounded art of gathering raw material, manufacturing, producing, improv\ulcornering design and production conditions. It may be possible that a farmer gathers material and weaves it manually but in others, it is im\ulcornerpossible to refine, bleach and dye because the process requires a professional industrial treatment. It is impossible to make art works to a farmer as every farner does not always have aesthetic sense. Though a farmer or producer has these all abilities, it is not desirable to him from economical view. 2. The development or improvement is essential in many sides but the most important thing seems to he in design. According to reports, it is, howevt!r, fact that the crafts improved in design of existing works have more expanded the sales than newly developed works. Therefore, ir appears advisable to improve designs of existing things positively as they have merit of occupying a position already, but on the other hand, new crafts have to be also developed and the producer should grasp the proper time. 3. Building up an industrial complex to improve design with collecting the producing districts for this works scattered allover the country is very desirable for speedy communication, intensive educa\ulcorner tion or training, and effective guidance. 4. In producing for export abroad, before everything, must know the life environment, custom! and manners, main thought of the country, and then produce according to these. S. The crafts of plant-stalk are the fIrst industry in present but in the futher it should change intc second or third industry. 6. A synethetic organization for supporting side line should be established for effectiveness, and experts have to be secured and also the educational-industrial complex and activation of study should be preceded.

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