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.

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.

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.

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.

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%).

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.

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.

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.

노동위원회 노동쟁의 조정의 성공영향요인에 관한 연구

박태영 ( Park Tae-young ),안성수 ( Ahn Sung-soo ) 한국자치행정학회 2020 한국자치행정학보 Vol.34 No.1

노동위원회 노동쟁의 조정에 있어 조정성공에 영향을 미치는 요인은 무엇인가? 본 연구는 2007년부터 2018년까지 노동위원회에서 처리한 노동쟁의 조정사건을 활용하여 조정성공에 영향을 미치는 요인을 분석하였다. 분석결과, 근로자 수가 200명 미만이거나, 조정회의에 노사대표 모두 참여할 때, 공익사업과 필수공익사업이 일반사업보다 조정이 성공할 가능성이 높은 것으로 나타났다. 반면에 노동조합 상급단체가 민주노총이거나, 조정회의에 노사위임자 모두가 참여한 경우에는 조정이 성공할 가능성이 낮은 것으로 분석되었다. 노동위원회가 노동쟁의 조정성공률을 높이기 위해서는 조정과정에 노사당사자의 대표자 참여를 유도하는 한편, 200명 미만 기업과 공익사업 등에 대해서는 보다 적극적인 조정서비스를 제공하고, 노사관계가 취약한 기업에 대한 지원제도를 활성화할 필요가 있다. What are the factors influencing the success of mediation in the mediation of the Labor Relations Commission? This study analyzed the factors affecting the success of mediation by using the mediation cases of labor disputes handled by the Labor Relations Commission in Korea from 2007 to 2018. As a result of the analysis, when the number of workers was less than 200 or both labor and management representatives participated in the mediation meeting, it was found that the public service projects and essential public service projects were more likely to be successful than the general business. On the other hand, it was analyzed that if the higher union of the union is a Democratic Trade Union, or if both labor and management delegates participated in the mediation meeting, the probability of successful mediation was low. In order to increase the mediation success rate in the labor dispute, the Labor Relations Commission invites representatives of labor and management parties to participate in the mediation process, while providing more active mediation services for companies and public interest projects with less than 200 employees, and revitalizing the support system for vulnerable company in labor relations. There is a need.

복권 성향 선호와 ELW 수익률간의 관계

박태영(Tae young Park),정기호(Giho Jeong) 한국경영과학회 2018 한국경영과학회지 Vol.43 No.3

In this study, we find that a negative correlation exists between the expected return of call ELW and the lottery-likeness of underlying stocks. Call ELW, with lottery-like stocks as the underlying asset, underperforms by 52.6% every quarter relative to its counterpart. This phenomenon is not driven by any known risk factors. The overpricing of call ELW written on lottery-like stocks cannot be fully explained by the overpricing of underlying stocks. Much more violation of put-call parity exists when its underlying stock has more lottery characteristics.