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.

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%).

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.

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.

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.

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.

네오슘페터주의 관점에서 바라본 다각화의 성공과 실패: 삼성 반도체사업의 세 가지 다각화 사례 연구

박태영 ( Tae Young Park ) 기술경영경제학회 2010 Journal of Technology Innovation Vol.18 No.2

기업들에게 다각화 활동은 경쟁에서 살아남고 그들의 성공을 지속시키기 위한 필수적인 수단이기 때문에 지난 30년 동안 산업경제, 전략경영, 네오슘페터주의 학파들에 의해 많은 연구들이 이루어졌다. 그러나 어느 학파도 다각화의 성공과 실패를 포괄적으로 설명할 수 있는 모델을 제시하지는 못하였다. 본 연구는 세 학파들의 연구결과물을 통합하여, 기업 의 기술적 역량과 섹터 고유의 특성을 포함한 이론적 틀을 제시하되, 기술측면을 강조한 네오슘페터주의 관점을 반영하였다. 그리고 그 틀을 이용하여 삼성의 세 가지 다각화 사례를 분석하여 성공과 실패의 주요 원인과 시사점을 찾고자하였다. 사례연구결과, DRAM은 마이크로프로세서보다 TFT-LCD와 더 유사한 섹터 특성을 갖기 때문에 삼성은 마이크로프로세서보다 TFT-LCD로의 다각화가 훨씬 수월하고 성공적이었다. 동일한 이유에서 삼성의 기술 역량은 DRAM 섹터에서 축적된 기술역량을 확장·강화시키는 형태로 발달되었다. 이러한 연구결과는 전략가들이 다각화 방향을 결정할 때 진출하고자 하는 섹터의 특성, 과거 섹터에서 축적된 기업의 기술역량, 기업의 기존 역량 중에서 진출하고자 하는 섹터의 특성과 조화를 이룰 수 있는 역량을 동시에 고려할 때 성공 확률이 높아진다는 교훈을 준다. Since diversification can be a necessary means for company`s survival and the conservation of its success, hundreds of studies have been done by three schools of industrial economics, strategic management, and Neo-Schumpeterian economics for over 30 years. However, any school has not presented a model comprehensively explaining diversification`` success or failure. The study tried to suggest a theoretical framework integrating findings came from three schools. The framework considers both firm`s technological capabilities and sector-specific characteristics as well as reflects a Neo-Schumpeterian view emphasizing technological aspects. The goal of the study is finding major reasons of success and failure during company`s diversification through studying three diversification cases of Samsung. Our findings show that the diversification toward TFT-LCD was easier and more successful than the diversification toward microprocessor because DRAM is more similar to TFT-LCD than microprocessor. Samsung also tended to build only the types of capabilities which were originated from capabilities accumulated in DRAM business. Our findings give firm`s strategists a lesson that they can increase the probability of success in diversification, if only they should simultaneously consider a new sector`s characteristics, a firm`s technological capabilities accumulated in old sectors, and the availability of old capabilities for being applied to a new sector.

남편의 원가족과 갈등 겪는 부부들의 가족치료 사례연구

박태영 ( Tae Young Park ),김혜선 ( Hye Sun Kim ),김태한 ( Tae Han Kim ) 한국가족관계학회 2010 한국가족관계학회지 Vol.15 No.3