복합재료 사용 바닥판 부재의 응력집중부에 대한 피로성능 평가에 관한 연구

박태영,박준석,김두환,Park. Tai-Young,Park. Joon-Seok,Kim. Doo-Hwan 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1

Recently the compound material has interested in using the structural material as the bridge member assembly. It is the lighter material against existing construction material and has excellent durability and economy. The existing floor of bridge has its short period to repair and replace compared to other parts of the bridge with the pavement and the shoe. These deteriorations of usage and safety by aging and corrosion are needed frequent maintenance. The use of compound material as a structural member suggests solve these problems. So this thesis evaluates the static and the fatigue performance for whether there are fiber lamination direction and stress concentration section of FRP floor plate, the compound material.

워터제트를 응용한 섬유집합체 결합에 관한 연구(II)-공정 인자와 섬유결합력-

박태영,주창환,최영엽,Park, Tae-Yeong,Ju, Chang-Hwan,Choe, Yeong-Yeop 한국섬유공학회 1991 한국섬유공학회지 Vol.28 No.12

Hydroentangled nonwovens are alternatively called water-jet 'entangled' or 'spunlace' nonwovens. The hydraulic entanglement system is new technique for consolidating individual fibers in a web by means of high pressure water without the need for binder or/and other supplementary treatment. In recent, this system has been very interested in the field of nonwoven industry, since hydroentangled nonwoven fabrics have the patterned structure similar to woven fabrics and keep soft and drape characteristics. In this study, hydroentangled nonwovens have been made with 100% rayon and 50% rayon/50% polyester blended web and produced by a newly designed nonwoven system with different processing parameters. The manufacturing factors considered are injecting height, feeding speed, and passage number. Effect of processing parameters on the breaking strength of nonwovens has been investigated and it is compared with the morphological structure of nonwovens, i.e., aperture size and fiber density.

손상누적모델의 비교를 통한 플래퍼론 연결부의 피로수명 예측

박태영,박정선,Park, Tae-Young,Park, Jung-Sun 항공우주시스템공학회 2009 항공우주시스템공학회지 Vol.3 No.4

This paper deals with the lifetime prediction of Aircraft Flaperon Joint made of AISI 4130 steel. Reviews are performed on the published damage models at first. And three different damage models are used for predicting the fatigue life of the structure subjected to variable amplitude fatigue loading. These models require no increase in complexity of use, nor do they require additional material property or mission loading information to achieve the improved accuracy. Finally a comparison among the fatigue results is performed. It is observed that the Miner's rule could predict longer life than other cumulative damage models which take into account loads below the endurance limit.

저에너지 접착기술에 의한 지오복합포의 제조와 특성화 연구

박태영,Park, Tae-Young 한국섬유공학회 1997 한국섬유공학회지 Vol.34 No.7

An ultrasonic bonding technique (low-energy bonding technique) is newly applied to produce geocomposite fabric and the technique can be used to bond two materials (film and nonwoven) in a single bonding step. The application areas of the fabric are steadily growing such as liners of industrial and municipal waste, drainage material of wall, temporary drainer, and various liner for water. In this study, the geocomposite consists of a combination of film (upper part) and nonwoven fabric (lower part) and the film is laminated and fused on one side of nonwoven by ultrasonic bonding technique. From the study of manufacture and physical property of geocomposite fabric, the physical property of film is remarkably increased with thickness 0.2 mm and over. For ultrasonic treated nonwoven fabric, the mechanical properties of prepunched nonwoven fabric are increased with a good entanglement of fibers but spunbonded fabrics show an opposite trend. The optimum weight of fabric must be considered for the perfect fusion of the thicker geocomposite. The synergy effects on the mechanical properties of the geocomposites through this technique are also found. The processing conditions, such as horn pressure and the feeding speed, can enhance the mechanical properties of the geocomposites. In addition, dense structure of nonwoven fabric has an important effect on the fusion of geocomposite as well as melting temperature of fiber, and seam strength of geocomposites is equal to tensile strength (CD) of film.

한지의 인장특성 해석 (II) -실험적 고찰-

박태영,추창환,Park, Tae-Young,Joo, Chang-Whan 한국섬유공학회 2010 한국섬유공학회지 Vol.47 No.3

To evaluate the tensile behavior of Hanji, a preceding paper proposed a theoretical equation of the tensile properties of Hanji including some fiber factors and Hanji thickness. The theoretical values of the tensile strength of Hanji were compared with the experimental tensile strength. In the present work, the random-laid and parallel-laid Hanji sheets were prepared and the tensile behavior of Hanji tape yarn, 8 mm in width, was selected to measure the tensile strength of the fibers related to the fiber stress limit. By calculating all values of the fiber stress limit, curl factor, orientation distribution factor, Poisson's ratio, and two dimensional effects, the general pattern of the predicted breaking stress of Hanji was found to be slightly different from the experimental breaking stress. This difference was attributed to the lower calculated fiber strength than real value, and the difficulty in calculating the theoretical strain of the Hanji fiber at small deformation. Considering these facts, the results were used to assist in the engineering and manufacture of wet-laid nonwovens for specific end-uses.

무, 배추 및 고추종자의 분쟁사례연구

박태영,윤화모,민병훈,Park, Tae-Young,Yoon, Wha-Mo,Min, Byung-Hoon 배재대학교 자연과학연구소 1996 自然科學論文集 Vol.8 No.2

'농산종묘법'하에서 1968년부터 1970년 사이에 발생한 채소 종자분쟁은 177건 이었다. 이중 발아불량에 대한 종자분쟁은 46건(26%)으로 가장 많았으며 불량종자는 43건(24.3%), 수입종자에 대한 분쟁은 42건(23.7%) 이형주에 대한 분쟁은 27건(15.6%) 순이었다.'종묘관리법'하에서 모든 채소로부터 발생한 종자분쟁은 1976년부터 1995년 사이에 175건 이었는데 무가 53건(30%)으로 비교적 많았으며 배추 19건(11%), 고추 17건(10%) 순이었다. 무에서 발생한 종자분쟁의 유형은 추대(36%), 파종기불이행(21%), 순도불량(19%) 등이었으며 배추는 미량원소 결핍(27%), 발아불량(21%), 결구불량(16%), 병해(16%) 등이었고 고추는 착과불량(6%), 기형과발생(5%), 병해(3%) 등이었다. The Number of the disputes originated from vegetable seeds in 1968-1970 under 'Seed and Seedling Law for Agricultural Product)' was 177.: Poor germination was the major one (26% of total disputes), followed by inferior seeds(24.3%), imported seeds(23.7%), and off-type plant(15.6%).During 1976-1995, under 'Administrative Law for Seed and Seedling' the number of disputes originated from vegetable seeds was 175.: 53 in radish, 19 in Chinese cabbage, and 17 in pepper. The type of dispute originated from radish seeds was premature bolting(26%), differences in sowing data(21%), poor purity(19%), micronutrient deficiency(9%), root cracking and branching(9%), poor germination(4%), and damage by disease(2%). In Chinese cabbage, micronutrient deficiency was the major one(27%), followed by poor germination(21%), incomplete head formation(16%), damage by disease(16%), poor purity(10%), and bolting(10%). In pepper, poor fruit setting was the major one(6%), followed by malformed fruits(5%), damage by disease(3%), purity(2%), and poor germination(1%).

낙동강 델타 점토 지역 고속도로 확장공사 시 장기침하 영향 분석 및 대책 검토

박태영,이명석,이성렬,이사익,Park, Tae-Yeong,Lee, Myeong-Seok,Lee, Seong-Ryeol,Lee, Sa-Ik 한국지반공학회 2011 지반 : 한국지반공학회지 Vol.27 No.11

경사진 연약지반의 부등침하 피해 방지를 위한 장기침하량 저감 사례

박태영,김국한,최영철,최형석,Park, Tae-Yeong,Kim, Guk-Han,Choe, Yeong-Cheol,Choe, Hyeong-Seok 한국지반공학회 2012 지반 : 한국지반공학회지 Vol.28 No.6

꼬임수에 따른 한지사의 인장특성과 표면구조 평가

박태영,주창환,Park, Tae Young,Joo, Chang Whan 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.3

Hanji paper yarn is a multi-functional and eco-friendly textile material that is excellent in the function of humidity control, absorbency-quick dry, antibiotic, deodorant property. Also, its structural characteristics similar to the filament yarn, brings a unique texture and comfort to the touch. In the present work, two kinds of Hanji tape yarn, HTY-23 ($13g/m^2$, 2.0 mm) and HTY-30 ($13g/m^2$, 1.5 mm), were prepared and the tape yarn had a yarn count of 23 Ne and 30 Ne, respectively. In addition, we designed most fibers of Hanji paper to be aligned parallel to the machine direction, allowing for a more favorable processing parameter with regards to the production of fine and tough Hanji paper yarn. The twist number showing a maximum breaking stress of HTY-23 and HTY-30 were 600 tpm and 800 tpm, respectively. Especially, the fluff hardly existed on the surface structure of Hanji paper yarn. In addition, yarn irregularity, yarn defective, and the hairiness of Hanji paper yarn were evaluated. Generally, there was no difference of yarn irregularity between HTY-23 and HTY-30 at the twist number showing the maximum breaking stress. The values of yarn irregularity were remarkably low compared to that of cotton spun yarn. Furthermore, yarn defective of Hanji paper yarn showed a similar tendency to the yarn irregularity.

한지의 인장특성 해석(I) - 이론적 고찰 -

박태영,주창환,Park, Tae-Young,Joo, Chang-Whan 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.3

Owing to formation of fiber fibrillation and application of binder bonding, pressing device, and curing process, the characteristic of prepared Hanji(korean traditional paper) is a thin structure, relatively high tensile strength and stiffness. To predict tensile property of Hanji, in the present work, a theoretical equation including tensile property of fiber, curl factor, orientation distribution function, and Poisson's ratio of Hanji was derived in consideration of fiber stress limit, slippage effect, and thickness. For accurate tensile property of Hanji, new definition of fiber stress limit was introduced. By applying the concept of finer tape yarn and thickness factor, this paper modified the earlier prediction theory of tensile stress of the nonwoven fabrics. In a next paper, the comparative analysis between this theoretical theory and experimental tensile behavior of Hanji will be discussed.