북경통신:신문으로 보는 중국

조현태 북한연구소 1997 北韓 Vol.- No.305

방향족 1급 아민화 셀룰로오스의 염색성 및 응용성

조현태,이재덕,조재준,Cho, Hyeon-Tae,Lee, Jae-Dug,Cho, Jae-Jun 한국섬유공학회 1991 한국섬유공학회지 Vol.28 No.8

Aromatic primary amino group was introduced into cellulose by curing with 4-amino-phenyl-g-sulfatoethylsul(one. These free amino groups, even in very low concentration, altered the chemical properties of cellulose. The animalized cotton fabric absorbed anionic dye and reacted with rective dye and glutaraldehyde. Thus the dyeing properties of it were investigated and the possibility of application to the crease-resistant finish was discussed.

아미노프로필 셀룰로오스의 염색성 및 응용성

조현태,이재덕,조재준,Cho, Hyeon-Tae,Lee, Jae-Dug,Cho, Jae-Jun 한국섬유공학회 1991 한국섬유공학회지 Vol.28 No.8

The chemical structure of aminopropyl cellulose is represented as follows : cellulose-g-CH2CH2CH2-NHa. The degree of substitution may be varied with the immunization process to be employed in previous papers. The amino groups in it undergo various reactions which are characteristic of aliphatic primary amines, Therefore in this paper, dyeing properties of the aminopropyl cellulose for the anionic dye and the reactive dye were investigated. The adsorption capacity of metal ion by it was also measured and the application of it to the crease-resistant finish was discussed.

연신조건이 폴리에스테르 섬유의 구조와 염색성에 미치는 영향(I) -연신온도의 영향-

조현태,김우섭 한국섬유공학회 2000 한국섬유공학회지 Vol.37 No.2

The effects of temperature in fiber drawing process on two different polyesters, undrawn yarn (UDY) and partially oriented yarn (POY), were investigated. Drawing temperature was varied from the glass transition temperature ($T_{g}$) of polyester (7$0^{\circ}C$) by 4$^{\circ}C$ intervals up to 94$^{\circ}C$ to study the relationship with structural variations, such as initial modulus, orientation, crystallization, and fiber evenness. Furthermore, we also tried to delineate the dyeing properties of polyester fibers which had been drawn at different temperature. results indicated that the increase in drawing temperature enhanced fiber evenness in drawing of POY, while the opposite trend was shown in the case of UDY. In both cases, the dye exhaustion was not varied and the dyeing rate was slightly increased with the drawing temperature.

무인 항공기 촬영 동영상을 위한 실시간 안정화 기법

조현태,윤경로,배효철,김민욱 한국반도체디스플레이기술학회 2014 반도체디스플레이기술학회지 Vol.13 No.1

Video from unmanned aerial vehicle (UAV) is influenced by natural environments due to the light-weight UAV, specifically by winds. Thus UAV's shaking movements make the video shaking. Objective of this paper is making a stabilized video by removing shakiness of video acquired by UAV. Stabilizer estimates camera's motion from calculation of optical flow between two successive frames. Estimated camera's movements have intended movements as well as unintended movements of shaking. Unintended movements are eliminated by smoothing process. Experimental results showed that our proposed method performs almost as good as the other off-line based stabilizer. However estimation of camera's movements, i.e., calculation of optical flow, becomes a bottleneck to the real-time stabilization. To solve this problem, we make parallel stabilizer making average 30 frames per second of stabilized video. Our proposed method can be used for the video acquired by UAV and also for the shaking video from non-professional users. The proposed method can also be used in any other fields which require object tracking, or accurate image analysis/representation.

ZigBee를 이용한 무선 네트워크 환경에서의 정밀 시각 동기 기법 설기 및 구현

조현태,손상현,백윤주 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.5

셀룰로오스의 캐티온화와 그 용용(II) ―Dichloro-s-triazine 유도체에 의한 셀룰로오스의 아민화―

조현태,이재덕 한국섬유공학회 1988 한국섬유공학회지 Vol.25 No.7

Amino group was introduced to cellulose with reactive dichloro-s-triazine derivative at low temperature, Dichloro-s-triazine derivative was readily prepared by reaction of 2, 4, 6-trichloro-1, 3, 5-triazine and ethylenediamine of which one amino group was protected by benzaldehyde. The reaction of cellulose with dichloro-s-triazine derivative is described including effect of change in time, temperature, reaction medium and concentration of sodium hydroxide. The effect of pH on the hydrolysis of the protected amino group in dichloro-s-triazine derivative was investigated and the rate of hydrolysis was also measured.

디에틸렌글리콜 단위를 함유하는 PET 필라멘트 섬유의 구조와 염색성

조현태,유승훈 한국섬유공학회 2003 한국섬유공학회지 Vol.40 No.6

Polyethylene Terephthalate(PET) from ethylene glycol and terephthalic acid or dimethyl terephthalate usually contains small amounts of diethylene glycol terephthalate(DEGT) units due to side reactions in polymerization. DEGT units do not participate in the formation of crystalline structure, and only very small amounts are incorporated in crystal as lattice defects. Most DEGT remain in amorphous regions. DEGT can reduce T$_{g}$ because of increase in main chain flexibility and the crystallizable segment length, resulting in an increase in the amount of amorphous regions of the PET fiber. These effects of DEGT can be anticipated to exhibit a great role in the improved dyeability of PET fiber without addition of any kinds of monomers or modifiers. Literature survey indicated that previous studies were mainly focused on the effects of DEGT on crystallization behavior and thermal stability of bulk PET. Studies on the effect of DEGT on PET filaments fiber could not be found in the literatures. In addition, no study is available to elucidate the effects of DEGT on the dyeability of PET. Therefore, to improve the dyeability of PET fiber the present study investigated the effects of DEGT contents on the structural properties and dyeability of PET filament. Polymer chips synthesized with the addition of diethylene glycol(DEG) in the polymerization were converted to the filament fiber by subsequent steps of spinning and drawing. Effects of various DEGT contents on the crystallinity of PET fiber, crystal size. and orientation factors of crystal and amorphous regions, and consequently, structure of amorphous regions which is an important factor in determining dyeability of the fiber were studied. Through evaluation of T$_{g}$ and dynamic mechanical properties, the effects of DEGT contents on the amorphous structure of PET fibers were also studied. Dyeing experiment was further carried out to determine the effect of DEGT contents on the uptake and diffusion coefficient of dye in the PET fiber.ber.

나일론-PET 분할형 극세사의 1욕 1단계 염색

조현태,박철권,Cho, Hyeon-Tae,Park, Chul-Kwon 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.1

To verify the dyeing behaviors of disperse, acid dye, and metal complex dye on nylon/PET(N/P) split type microfiber in the one bath-one step dyeing, the exhaustion curves of the dyes in single and mixed dye bath were measured under different dyeing temperature and pH of dye bath. Exhaustion behaviors of disperse dye in the one bath dyeing of NIP split type microfiber with disperse dye/acid dye or disperse dye/metal complex dye were not significantly affected by dyeing temperature and pH of dyebath. Acid dye showed high temperature dependency of adsorption-desorption behavior during elevation of dyeing temperature in the one bath dyeing of N/P split type microfiber with disperse dye and acid dye. Metal complex dye in the one bath dyeing of N/P split type microfiber with disperse dye and metal complex dye showed also the temperature dependency of adsorption-desorption, but the final absorption was higher than that of acid dye in the same dyeing conditions and increased with decrease of dyebath pH. The staining of disperse dye on nylon was not effected by dyeing temperature but was decreased with the decrease of pH in the one bath dyeing of N/P split type microfiber.

유비쿼터스 항만 물류 환경을 위한 스마트 태그 시스템의 설계 및 구현

조현태,백윤주,Cho, Hyun-Tae,Baek, Yun-Ju 한국정보통신학회 2007 한국정보통신학회논문지 Vol.11 No.8

In recent, rapid and accurate processing for logistics have been required, according as logistics has grown dramatically. Especially, identifying, locating, or tracking objects in ports are important, because ports are gateways to extended markets. In this paper, we describe the design and implementation of a smart tag system for ubiquitous port logistics. Our solution consists of three parts: an active RFID to identify objects, an electronic container seal to charge with security of containers, and a RTLS system to locate objects. Because identification technology for logistics can be read by heterogenous systems, compliance with the international standard is one of the most critical issues. This paper introduces the method to maintain compliance with ISO, and conducts some verifications. In addition, we analyze the system performance such as lifetime, identification rate, and time for multiple tag identification. 최근 물류의 양이 증가함에 따라 빠르고 정확한 물류처리가 요구되어 지고 있다. 특히, 광역 물류 환경에서 게이트웨이로서의 역활을 수행하는 항만에서의 물류처리는 무엇보다 중요하다. 본 논문에서는 항만에서 보다 신속, 정확한 물류 처리를 수행하기 위한 스마트 태그 시스템을 설계 및 구현한다. 스마트 태그 시스템은 사물의 정보를 인식하는 능동형 RFID, 컨테이너의 보안을 담당하는 전자봉인 장치, 그리고 사물의 위치를 파악 및 추적하는 RTLS 시스템으로 이루어져 있다. 물류 환경에서 사용되어는 인식 기술은 이종 시스템들에서 판독되어지므로 표준과의 호환성은 중요하다. 본 논문에서는 표준과의 호환성을 유지하는 방법을 소개하고 검증을 수행하였으며, 스마트 태그의 수명, 인식률 및 인식시간 등과 같은 시스템의 성능을 분석한다.