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개인 휴대용 방공체계 (MANPADS) 발전 및 현황

  • Guest Peter
    • Defense and Technology
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    • no.6 s.172
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    • pp.58-63
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    • 1993
  • 개인 휴대용 방공 무기체계의 야전배치는 항공기 및 헬기에 대한 자체방어 능력을 강화시켜 줍니다 제3세대 가시선 통제 유도 시스템의 휴대용 미사일은 다른 화기나, 현재 운용중인 적외선 유도미사일보다 가격이 저렴하며, 보다 유용하고 효과적입니다

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Synthesis and Characterization of Iridium-Containing Green Phosphorescent Polymers for PLEDs

  • Xu, Fei;Kim, Hee Un;Mi, Dongbo;Lim, Jong Min;Hwang, Ju Hyun;Cho, Nam Sung;Lee, Jeong-Ik;Hwang, Do-Hoon
    • Bulletin of the Korean Chemical Society
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    • v.34 no.2
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    • pp.399-405
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    • 2013
  • Two series of new green phosphorescent polymers bearing a bis(2-phenyl-pyridine)iridium(III)(dibenzoylmethane) [$(ppy)_2Irdbm$] complex were designed and synthesized. Poly-carbazole (PCbz) derivative or polyfluorene with pendant carbazole groups (PFCbz) were employed as host polymers for the iridium complex. The iridium complex monomer was copolymerized with the host monomers using varying monomer ratios via a Yamamoto coupling reaction. Efficient energy transfer from host to dopant unit was observed by increasing the ratio of the iridium guest in the copolymers. Electroluminescent devices with the configuration ITO/PEDOT:PSS/polymer/BmPyPB/LiF/Al were fabricated and characterized. The phosphorescent polymers composed of the iridium complex guest and polyfluorene with carbazole pendants as a host performed better than the polymers composed of the same guest and the main chain polycarbazole host. A maximum external quantum efficiency of 0.73%, a luminous efficiency of 1.21 cd/A, and a maximum luminance of 372 $cd/m^2$ were obtained from a device fabricated using one of the synthesized copolymers.

Performance Improvement of Virtualization Sensitive Instruction Emulation by Instruction Decoding at Compile Time (컴파일 시간 명령어 디코딩을 통한 가상화 민감 명령어 에뮬레이션 성능 개선)

  • Shin, Dong-Ha;Yun, Kyung-Un
    • Journal of the Korea Society of Computer and Information
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    • v.17 no.2
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    • pp.1-11
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    • 2012
  • Recently, we have seen several implementations that virtualize the ARM architecture. Since the current ARM architecture is not possible to be virtualized using the traditional technique called "trap-and-emulation", we usually detect all virtualization sensitive instructions during the run-time of a guest kernel and emulate them virtually rather than executing them directly. The emulation for virtualization is usually implemented either by binary translation or interpretation. Our research is about how to improve the performance of emulation for virtualization based on interpretation. The interpretation usually requires a few steps: instruction fetching, instruction decoding and instruction executing. In this paper, we propose a method that decodes all virtualization sensitive instructions during the compilation time of a guest kernel and reduces the time required for interpretation during the run time of the guest kernel. Our method provides both implementation simplicity and performance improvement of emulation for virtualization based on interpretation.

Identification of Toxic Chemicals Using Polypyrrole-Cyclodextrin Hybrids (폴리피롤-사이클로덱스트린 혼성체를 이용한 유해화합물질의 검출)

  • Bae, Joonwon
    • Applied Chemistry for Engineering
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    • v.30 no.2
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    • pp.186-189
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    • 2019
  • Polypyrrole is a typical electrical conducting polymer, which has an excellent charge transport property. Cyclodextrins are a group of toxic-free and cyclic oligosaccharide molecules, capable of capturing low molecular weight chemicals. Considering these advantages, hybrid materials of polypyrrole and cyclodextrin can be used to detect hazardous compounds. Cyclodextrin molecules can accommodate toxic chemicals by the formation of host-guest complexes and generate electric signals, which are effectively delivered by polypyrrole backbone. In this study, the polypyrrole/cyclodextrin hybrid material was prepared using a facile wet method and included into a hydrogel. Subsequently, it was applied to a simple sensor system with a gold-patterned electrode for the detection of potentially hazardous material, methyl paraben. Compared with pristine polypyrrole, it was found that the polypyrrole/cyclodextrin hybrid showed an improved performance. This study can be an example of using environmentally benign conducting polymer/cyclodextrin hybrids as sensing media.

A Study on the Relationship Between Emotion and Behavior of User's with the Color Images of Indoor Space in Hotels (호텔 실내공간 색채이미지에 대한 이용자의 감정과 행동의 관계)

  • Kim, Su-Hee;Kim, Bong-Ae
    • Journal of the Architectural Institute of Korea Planning & Design
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    • v.34 no.2
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    • pp.67-74
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    • 2018
  • The purpose of this study was to analyze relationship between emotion and behavior with the color images of indoor space in hotels. The study methods evaluation experiments of emotion and behavior with computer graphic images. Study results are as follows: First, The color image according to the indoor space had a significant influence on the user's emotions. Lobby and restaurant had difference in pleasure arousal emotion by color image, and also guest room had difference in pleasure dominance emotion by color image. Second, The color image according to the indoor space had a significant influence on the user's behavior. Also lobby and restaurant had difference in movement hobby eating resting behavior by color image, and guest room had difference in hobby eating resting behavior by color image. Third, As a result of analyzing the effect of user's emotions on the behavior according to the indoor space: In the lobby, the more un-arousal increasing of users, the more hobby resting behavior increasing. And the more dominance increasing of users, the more movement hobby eating resting behavior increasing. In the restaurant, the more dominance increasing of users, the more movement eating hobby behavior increasing. The more arousal increasing of users, the more movement resting behavior increasing. The more un-arousal increasing of users, the more hobby eating behavior increasing. In the guest room, the more un-arousal dominance increasing of users, the more hobby eating resting behavior increasing. And also the more arousal increasing of users, the more movement behavior increasing.

A study on the high-level house floor plan used the old drafts owned by the head family of Ongye in Andong (안동(安東) 온계종택(溫溪宗宅) 소장(所藏) 가도(家圖)를 통한 반가(班家) 평면형식 고찰)

  • Lee, Ho-Yeol
    • Journal of architectural history
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    • v.17 no.1
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    • pp.85-102
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    • 2008
  • As a result of analyzing the floor plan shown in the three drafts, there were a great deal of differences in composing the space of the inner main hall. The inner room facing to the east with the arrangement crossing the inner floor at right angles in the 'Baekdangguje Draft' faces to the south in the east or west in front of the main house thereafter. This represents that it reflects the intent of the owner of the architecture emphasizing the size increase and ceremonies of the main house in the 'ㅁ shape', which has changed to the directions of easily accommodating the Confucian ceremonial activities in the floor plan of the inner house as the size of the main house was gradually increasing from 24 sections to 30 or 38 sections. The expansion in the size of main house further divided the functions of floor into one for daily life and the other for ceremonies as well. In other words, the 30 Sections in Yijeong Draft as being the first planned draft for reconstruction had a hall for memorial services in the main hall of the inner house, whereas the 'Draft with 38 Sections' as being the second planned draft for reconstruction was planning a room with a floor (two sections of Bangdang) for memorial purpose in the back of the inner main hall. The variations in the guest house (or space for men) shown in the drafts confirms the establishment of space for men as the size of the main house increases. We can see the change that a large guest house is placed over the south and in the south and east of the main house as the number of main house increases by 30 sections or 38 sections. Especially, a guest house with a wide space in a 'ㄴ shape' is arranged from the south of main house to the east wing in the Draft with 38 Sections. In addition, the backward sections are advanced in the front and back of guest house in the drafts with 30 and 38 sections, while a back floor or a back floor connecting to the back room or sleeping room or inner house is installed in the backward sections.

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