羊毛 Crimp의 橫壓縮擧動에 關한 硏究

楊澈坤,裵基瑞 충남대학교 공업기술개발연구소 1976 工業技術開發硏究所論文集 Vol.3 No.2

Concerning with the mechanics of wool crimps deformation, the tensile and torsional behavior along the longitudinal axis have been studied by many authors. However, published papers reporting the lateral behavior are extremely limited in number. In the present study, attempts have been made to investigate the lateral compressive behavior of wool crimps (Polwarth 65'^s ram). The main results are; 1) For the crimps of sine curve form, the variation of E.C.D. may be obtained by var.E.C.D.=(FR^3)/(4EI)(π-8/π) 2) For the crimps of helix form, the lateral compressive force F per pitch is obtained by the sum F_1+F_2, where F_1 is the force due to the bending deformation and F_2 the force associated with the torsional deformation.

'77학년도 신입생의 知能檢査 結果 分析

楊澈坤,金言柱 충남대학교 1978 學生生活硏究 Vol.5 No.-

1,460명을 대상으로 실시된 '77학년도 신입생의 IQ 결과는 다음과 같았다. 신입생 전체의 IQ 평균은 105이고 표준편차는 9.8이다. 의예과 신입생의 IQ 평균치(118)가 가장 높았고, IQ 120이상 학생은 전체의 11%이고 IQ 80이하가 10%이었다. 표준화집단의 IQ와 비교해 볼 때, 신입생 전체의 47%가 上(75~100 percentile)에, 29%가 中上(50~74 percentile)에, 20%가 中下(25~49 percentile)에 4%가 下(0~24 percentile)에 속해 있다. 제시된 提言은 知的 能力에 따른 敎授法의 多樣化를 통한 敎授의 個別化方法이었다.

1976學年度 新入生 選拔考査 結果分析

楊澈坤,崔鍾碩,李東洙 충남대학교 1976 學生生活硏究 Vol.4 No.-

The synthesis and analysis for the result of the entrance examination of Chungnam University in 1976 are as follows : 1. The difference between proportion of standard contribution and proportion of practical contribution in written tests was 11.5% in Natural Science division, 5.5% in Humanity and Social divisions, and it was 10% proportion of added contribution, as the proportion of contribution showed 52% practically. As the standard deviation was low for the average points in certain subjects, the distinctive effect was very poor. As the difference of mean between the subjects has significance, it is necessary for us to make porportion of practical contribution get near to the proportion of standard contribution and to promote the distinctive effect by considering the difficult level promote when giving an examination. 2. The fact that there was an extremely low correlation coefficient among the same subjects in prelimanary and entrance examination in all the subjects except English (including foreign languages) in Humanity and Social division and in mathematics and science in Natural Science division showed that there were many absurdities in uniformity in giving tests, guidance for writing answers and guidance for the entrance examination for applicants. It is necessary that Ministry of Education and university authorities should take into consideration to the equalization of high schools with the organic study on the entrance examination, special guidance for the subjective test and the special guidance for the many fields of study. 3. As English Ⅱ, German, Japanese, Chinese, and Spanish are optiomal subjects, there appears a significant difference between average proportions of points owing to complex factors. Since this problem occurs every year, it seems rational that standard score should be adopted. 4. Though the standard proportion of oral test in getting points is 2.5%, there apears rather high level of practical contribution. As the standard variation is weak indistinctive effect, 2.4% in Natural Science division, 2.5% in Humanity and Social divisions, and has not correlation with other subjects, but has independence, it is hopeful to add oral test to the total points of entrance examination.

異形斷面 纖維의 굽힘剛性 測定方法

楊澈坤 成均館大學校 科學技術硏究所 1983 論文集 Vol.34 No.2

This study discussed the mothod for measuring the bending rigidity of fine fibres which had noncircular cross-section by the cantilever method. To obtain the relation between deflection and force for a single fibre, the apparatus consisted of a U-gauge, a differential linear transformer and a recorder was used. As the result of comparing the bending rigidity G, measured by the cantilever method with the bending rigidity EI, measured by the tensile testing method, the values of G were lower than those of EI. It was supposed that the adoption of the cantilever method for the measurement of bending rigidity was more recommendable than that of tensile testing method based on the simplicity of experiments and experimental errors.

國産 羊毛의 物性에 관한 硏究

楊澈坤,金洪均,安泰煥 成均館大學校 1981 論文集 Vol.30 No.-

Physical properties of wool are closely related to species of sheep, locality of production and feeding conditions. This paper describes an basic investigation of physical properties of Korean wool. Specific properties affected by crimp were also investigated. The experiment for physical properties of Korean wool was carried out by the conventional method and its for specific properties was done by load extension test. The results of those were as follows; 1. As for fineness values of wool, the quality numbers of Corriedale wool was 56's and its of Romney marsh wool was 46's-48's. 2. As for fineness, mean length, distribution of fibre length, strength and elongation of Corriedale wool were superior to those of standard wool. 3. It was found that strength per denier and elastic limit strength of both species were sligtly higher than its of standard wool 4. Uncrimping force was 1/15-1/21 of yield stress, Recovering of uncimping force and enegy in Korean wool was also significant. 5. Corriedale wool has good quality of which uncrimping force and energy would be changed by crimp. Characteristics of Corriedale wool; elasticity, softness and bulking capacity of wool itself were slightly higher than its of Romney marsh wool

羊毛 Crimp의 引張擧動에 關한 硏究

楊澈坤 충남대학교 공업기술개발연구소 1975 工業技術開發硏究所論文集 Vol.2 No.2

Geometrical expression of wool crimps and load-deflection relation of crimps under tension were investigated theoretically with E. C. D. as a parameter. Experimental verification was made with samples of Polwarth 65's ram wool grown in Korea, and the results are as follows: 1. Geometry of irregular wool crimps can be expressed in terms of curvature, torsion and end view. 2. Below the elastic limit, load-deflection relation of crimps under tension was established. 3. E. C. D. in the elastic range with a parameter, load, can be found from E. C. D. = 4 ε√(EI/F_x) and with a parameter, wave length, can be expressed as ; E. C. D. = (ελ)/(2E(ε, π/2)-F(ε,π/2)) 4. Elastic limit of the wool crimp used for this experiment is about 7mg/d.

유리섬유강화 열가소성 복합재료의 성형조건이 파괴인성에 미치는 영향에 관한 연구

양철곤,이덕래,이재호 한국섬유공학회 1999 한국섬유공학회지 Vol.36 No.8

Although thermoplastic composites have many attractive physical properties including toughness and high strength, they have not been used widely due to poor processability. In this study, the unidirectional composites were fabricated under different molding pressures and holding time using parallel yarn which consists of 30, 40 and 50 volume percent of glass fiber. The mechanical properties of PET/GF composite were investigated by ILSS and DCB (double cantilever beam) methods. The relationship between molding conditions and mechanical properties were discussed. Moreover, observation of fracture surfaces using SEM clarified the influence of molding conditions on fracture behavior. As a result, it was also observed that severe increase in molding pressure caused extrusion of resin and increase in void fraction, which in turn to decrease in fracture toughness.

工業系 實科敎師 再敎育 改善을 위한 調査硏究

楊澈坤,李載元,金言柱 충남대학교 1977 工業技術開發硏究所論文集 Vol.4 No.2

This study aims to evaluate the in-service technical teacher training program which was conducted by the Industrial Education College Staff C.N.U. for six weeks from July 18th to August 27th in 1977. The pre-designed questionars were distributed to the 471 participated technical high school teachers and responded data collected from the 467 teachers out of 471 ones were analysed and studied. It is desirable to consider the following founds of this study in the future in-service teacher training programs which are expected to conduct every year by the Industrial Education College Staff. The founds of this study are: a. The majority of the participated teachers responded that they have not only improved their professional knowledges and skills but also facilitated their professional responsibilities as the technical teachers. b. The levels of the lectures presented by the Architectural and Electronic faculties were more or less exceeded participants' acceptances. c. The contents of the programs conducted by the chemical textile and metallurgical faculties were more or less not closely related to the Technical High School curricula offered by the participants. d. The program should be emphasised more Lab./Shop practices than class lectures in order to improve their skill competencies. e. The field trip/visiting industries should be guided more often than it has been done. f. The amount of allowance for participants payed from each local board of education should be reached to the government established standard.

권축섬유의 하중-신장 거동

양철곤,원천화구 한국섬유공학회 1983 한국섬유공학회지 Vol.20 No.6

본 연구는 권축섬유의 하중-신장거동에 대한 이론적인 검토와 그 결과를 기존의 방법으로는 측정하기 어려웠던 가는 섬유의 강성도를 외팔보법(cantilever method)에 의하여 측정함으로서 실험적으로 확인하여 보았다. 섬유에 주어지는 권축형태가 다양하지만 유형별로 크게 분류할 때 싸인곡선 형태와 나선형태로 분류될 수 있으므로 두 형태로 구분하여 이론적으로 검토하여 보았으며, 실험에서는 폴리에스테르계섬유(2d, 3d) 싸인곡선 형태에, 잡종양모(56's)는 나선형태에 각각 적용시켜 검토하였다. 실험 결과로부터 권축섬유의 하중-신장에 있어 초기영역에서는 이론곡선과 실험 결과가 대체적으로 잘 부합되고 있음을 확인하였으며, 또한 단섬유의 강성도 측정에서 외팔보법을 이용하면 이형단면 섬유의 정확한 굽힘강성 측정을 손쉽게 할 수 있다는 결과로 이해되었다. The theoretical load-extension behaviour of crimped fiber was studied on the basis of experimental results. The crimped forms of samples were assumed sinusoidal for polyester staple fiber and helical for cross-bred wool fiber, respectively. Flexuarl rigidity of fiber which was one the important factors in load-extension behaviour was measure by canilever system apparatus developed by authors. It is shown that by putting the value of flexural rigdity(G) into derived formulas, the load-extension behaviour of a crimped fiber can be predicted precisely in the initial uncrimping region.

1978學年度 新入生 心理特性

楊澈坤,金言柱,權純明 충남대학교 1979 學生生活硏究 Vol.6 No.-