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.

EPS시공을 통한 암거 기초 부마찰력 경감 사례

박태영,이명석,최영철,이성렬,최형석,Park, Tae-Yeong,Lee, Myeong-Seok,Choe, Yeong-Cheol,Lee, Seong-Ryeol,Choe, Hyeong-Seok 한국도로학회 2011 도로 : 도로학회지 Vol.13 No.3

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.

한지 테이프사를 이용한 직물 제조와 물성 평가

박태영,전향란,Park, Tae-Young,Jeon, Hyang-Ran 한국섬유공학회 2008 한국섬유공학회지 Vol.45 No.5

Hanji woven fabrics are currently developed as a new multi-functional textile material due to their excellent properties of humidity control function, antibiotic, deodorant efficiency, and absorbency. In this study, Hanji union fabrics (silk $yarn{\times}Hanji$ tape yarn) were produced and their weavability, physical property, shrinkage, and color fastness were evaluated. Hanji paper and the tape yarns of $13g/m^2$ and 1.5-8.0mm were produced by a cylinder mould machine and a micro-slitter, respectively. From the weavability evaluation, a critical width of Hanji tape yarn as possible picking was found to be 2.0mm. As the width of tape yarn increased, the breaking stress and strain of the tape yam increased. Especially, after picking, the tensile property of Hanji tape yarn approached to the values of Hanji yarn. The shrinkage of dyed Hanji fabrics was 3.0% or less. On the evaluation of fastness to washing, the grade of Hanji union fabric showed good values and better value to the staining rather than color change. Also instead of washing, dry cleaning is desirable to the fabric. Hanji fabric was excellent in color fastness in grades 4-5 both to rubbing and perspiration, but was 3 grade to light resistance. To increase color fastness to light, plied yarn or union fabric with excellent light resistant yarn such as polyester may be applied.

스프레이접착제 부직포의 특성화 연구(I)-압축특성과 인장특성-

박태영,전한용,주창환,Park, Tae-Yeong,Jeon, Han-Yong,Ju, Chang-Hwan 한국섬유공학회 1996 한국섬유공학회지 Vol.33 No.4

Abstract : In a Spray-Bonded Nonwoven(SBN) system, small particles of adhesive bonding agent are applied to the fibrous layer in the form of a water dispersion. Since the characteristics of SBN are with bulkiness, highlight, good warmth and porosity, SBN is usually used as apparel padding, insulation, quilting flaterial and bedding. And so it is important to evaluate the compressional and tensile properties of SBN in considering application of end-use. From this fact, we have studied these properties of SBN made with different fibers, blend ratio, fabric weight and washing condition and found the facts as follows: (1) In preliminary study, heat treatments on the fabric surface are allowed SBN to be dense and full, and the compressional properties are dependent on the SBN structure with fiber characteristics, (2) The binder can not be readily penetrated onto the microflber web and its penetration is concerned with web thickness, (3) Blended binder fiber is a factor to increase the tensile strength of SBN, (4) For SBN before and after laundering, the compressional properties show a big difference for the SBN with microfiber and hollow fiber, and the tensile strength is generally decreased with increasing number of laundering.

세번수 지사의 제조와 인장특성 평가

박태영,Park, Tae-Young 한국섬유공학회 2007 한국섬유공학회지 Vol.44 No.6

Paper yarn is an eco-friendly textile material which is light in weight, excellent in humidity control function and air permeability. It has a unique texture and touch because it contains filament yarn structure which is a high value-added natural material. In this study, the method for producing fine paper yarn, its tensile property and surface structure were studied. Paper sheets of 10, 12, $14\;g/m^2$ were first prepared using manila hemp through the paper making process. The paper tape yarn and the paper yarn were continuously produced by using a micro-splitter and twister. As the weight and the cutting width of the paper tape increased, the tensile property (breaking stress and strain) increased. The produced paper yarn had a count number of $35-63N_m$ and a maximum breaking stress of $1.38{\sim}1.54\;gf/d$. It was also found that the optimal mixture ratio of the paper reinforcing agent for knitting and the twist number showing the maximum breaking stress of the paper yarn were nearly 0.6% and $750{\sim}850\;tpm$, respectively. The produced paper yarn can be used in home textiles such as bedding, table cloths and curtains, as well as fashion material.

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.

비대칭적 점프확산 모형의 효율적인 베이지안 추론

박태영,이영은,Park, Taeyoung,Lee, Youngeun 한국통계학회 2014 응용통계연구 Vol.27 No.6

Asset pricing models that account for asymmetric volatility in asset prices have been recently proposed. This article presents an efficient Bayesian method to analyze asset-pricing models. The method is developed by devising a partially collapsed Gibbs sampler that capitalizes on the functional incompatibility of conditional distributions without complicating the updates of model components. The proposed method is illustrated using simulated data and applied to daily S&P 500 data observed from September 1980 to August 2014.

Photoinduced Graft Polymerization of Acrylic Acid onto Isotactic Polypropylene

박태영,김상율,송석규,Park, Tae-Yeong,Kim, Sang-Yul,Song, Seok-Gyu The Korean Fiber Society 1989 한국섬유공학회지 Vol.26 No.3

Grafting of acrylic acid(AA) onto isotactic polypropylene(iPP) film was investigated. Graft polymerization was carried out with ultraviolet(UV) irradiation method in the presence of benzophenone(BP) as a photoseensitizer. The most suitable reaction temperature was 7$0^{\circ}C$ for the maximum grafting yield. Moisture regain and swelling properties of grafted films were markedly improved by the grafting of AA monomer. The crystallinity of grafted film was evaluated from dsc and X-ray diffraction measurement. It was found that the crystallinity decreased with increasing grafting yield up to 100% but decreased sharply above 100%. Infrared spectra also showed the decrease of crystallinity. Mechanical properties of grafting films were also examined by tensile testing machine.