鬪技種目 選手들의 試合前 競爭狀態 不安에 관한 調査硏究 : Taekwondo, Judo, Boxing, Wrestling 태권도, 유도, 복싱, 레슬링 종목을 중심으로

鄭海駿,朴贊弘 公州大學校 스포츠科學硏究所 1994 스포츠科學硏究所論文集 Vol.- No.8

To study the degree of the match player's anxiety about competition before games, 59 taekwondo players, 66 judo players, 59 boxers, and 66 wrestlers(total 243 players) were sampled for this research. The results of the study were the following. 1. At different games(taekwondo, judo, boxing, and wrestling) the degree of the anxiety about competition before games was non-significant. 2. In different school years(the 1st, the 2nd, the 3rd year) the degree of the anxiety was very significant. 3. In different regions (a special city, chikhal-shi, province) the degree of the anxiety was very significant.

3種의 外生 Auxin 植物과 그 酸度처리가 몇몇 木本觀葉植物의 揷木發根에 미치는 영향

鄭海駿,郭炳華 培材大學校 1985 論文集 Vol.6 No.-

Effects of synthetic auxins, NAA, IBA and Figaron, were of interest to study the promotion on rooting softwood cuttings of certain woody ornamental species. The greatest promoting in Forsythia rooting was noted with 200 ppm NAA treatment for 2 hr - dipping, and next with 1,000 ppm IBA for 30min and 200ppm Figaron for 10 min dipping, The same was also most true for Hydrangea. Ligustrum, however, showed the greatest extent of rooting with 500ppm NAA and 100 ppm Figaron, whereas Weigela showed IBA to be the most effective in promoting the rooting when compared with the effect of the other two exogenous auxins, NAA and Figaron. Gaedenia also showed similar extent of rooting among the treatments of NAA, IBA and Figaron. The influence of these auxins at different pH levels on cuttings was generally striking in case of Forsythia, yet the most rooting was observed at pH 6.0 and decreasing extent as pH level is either lowered or raised from that range. Ligustrum rooting showed most in acidic range with NAA, while showed most in neutral range with Figaron. Most striking influence was observed with Figaron of pH 4 and 8 for Hydrangea, whereas pH difference has no indicative difference in promoting rooting of Weigela and Gardenia cuttings. The auxinic solutions at extreme acid and basic ranges tended to show rather suppressed extent of rooting of these two species. All these indicated the fact that most suitable pH range for rooting cuttings is much dependent on different plant species and auxinic materials, Further studies would be necessary for and elucidate a better combination of a modified auxinic treatments to promote rooting cutting of various woody ornamental species.

In Vitro Culture에 의한 Fatshedera lizei의 Callus 誘導 및 器官分化에 관한 硏究

鄭海駿 培材大學校 1984 論文集 Vol.5 No.-

In order to determine the proper medium fot the induction of callus and the differentiation of organs from in vitro culture of Fatshedera, leaf discs, petiole segments, stem tissues, and axillary buds were cultured on the Murashige & Skoogs medium contained various levels of plant growth substances . It was possible to obtain the results as following : For initiation of callus petiole segments was proved to be the most suitable one among various explants. The growth of callus was more vigorous on the medium contained 1-2㎎/l, 2, 4-D and 0.1-1㎎/l BA than other treatments. Auxio was critically required for the initiation of callus and its growth. BA was not indispensable for it, however, at low concentration of BA seemed to enhance the callus inductirn of anxin. Calli developed from the petite segments were subcultures on the media contained various levels of 2,4-D and BA, and the best callus formation was obtained on the medium with 2㎎/l 2,4-D and 0.5㎎/l BA after cultivation for 6 weeks or more. Adventitious roots were differentiated from the callus surface, but shoots were not. The best formation of adventitious roots from callus subculture was obtained on the medium contained 2㎎/l 2,4-D and next 2㎎/l NAA Plus 0.5㎎/l BA. IBA had a little effect on the formation of adventitious rooks at high concentration as 5 ㎎/l. AH axillary buds on the MS medium were developed into a single shoot, however at high concentration of 5㎎ or 10㎎ 2,4-D they turned dark brown and died.

幾何的 計劃法을 應用한 平面트러스 構造物의 形狀最適化에 關한 硏究

鄭海駿,李鎭沃 충남대학교 공업교육연구소 1984 論文集 Vol.7 No.1

The formulation of the geometric optimization for truss structures based on the elasticity theory turns out to be the ncnlinear programming problem which has to deal with the cross-sectional area of the member and the coordinates of its nodes simul-taneously. A few techniques have been proposed and adapted for the analysis of this nonlinear programming for the time being. These techniques, however, bear some limitation on truss shapes, loading condition and design criteria for the practical application to real structures. A generalized algorithm for the geometric optimization of the truss structures, which can eliminate the above mentioned limitations, is developed in this study. The algorithm developed utilizes the two-phases technique. In the first phase. the cross-sectional area of the truss member is optimized by geometric programming method. In the second phase, the geometric shape is optimized utilizing the unidirectional search technique of the Powell method which make it possible to minimize only the objective function. The algorithm developed in this study is numerically tested for two truss structures and compared with the results of other algorithms to examine its applicability and stability. The numerical comparison show that the two-phases algorithm developed in this study is safely applicable to design, and the convergency rate is fast and stable compared with other iteration methods for the geometric optimization of truss structures.

겨울 Concrete 打設에 對한 小考

鄭海駿 大田工業高等專門學校 1967 論文集 Vol.2 No.-

Lycopersicum esculentum 'cherry tomato'의 葯培養에 관한 硏究

鄭海駿,李永馥 培材大學校 1984 論文集 Vol.5 No.-

Anthers at the stage of uninucleate microspore of Lycopersicum esculentum 'cherry tomato' were cultured on the Murashige and Skoog's medium suppllemented with NAA and BA. Most of the binucleate microspores were equationally divided whereas the unequational division was relatively rare. The two nuclei formed were again divided into multinuclei, which were further developed into calli. After one month of culture, calli there formed on the MS medium containing BA 2mg/l and NAA 0.25mg/l. Shoot of embryoid-like body was not formed from the calli after subculture on the medium with reduced amounts of auxins.

천연 자갈 콘크리트와 쇠석 자갈 콘크리트와의 강도 비교에 관한 연구

鄭海駿 大田工業高等專門學校 1971 論文集 Vol.8 No.-

The materials in concrete for building are made up of cement, gravel and sand, Among these gravels are divided into natural stone and small broken stone. The small broken stones ate mainly used for paving the road. And it is oftecn thought to be impossible to make concrete building without the natural stone. According to the development of constructional machines, it is possible for us to make various sizes of small broken stones, By combining these various sizes of stones in fitable percentages, we are able to make excllent concrete with good fineness modulus. This paper is, as the first step, the study on the conparison of their intensites when we make concrete by using the natural stones and small broken stones. It is pitiful that there are no good materials for the study of the small broken stone concrete and this field in korea. I hope this paper to be contributed to the construction of our country.

正三角形網으로 配列된 기둥 위의 Flat Slab의 휨모멘트 解析에 대한 硏究

鄭海駿 충남대학교 공업기술개발연구소 1976 工業技術開發硏究所論文集 Vol.3 No.1

Generally speaking, a flat slab is placed on the columns arranged in the form of a rectangle network and hereby it is used to analyse the stress conditions and to put into practice. While most European countries have put it into practice for a long time, we have not developed its application in practice situations as much. This paper is therefore intended primarily to investigate the bending moments of a rectangle network and of a flat slab in the form of a triangle network through a method set for solution of a flat slab of a cirular plate. By this above analysis it could the Fig-2 and the values of the bending moments at the point of b=?were able to calculate through the Fig.2.

나리류의 鱗片繁殖에 關한 硏究

鄭海駿(Chung H.J),趙正鎬(Jo C. H.),朴魯福(Park N. B.),陳星桂(Jin S. G) 한국원예학회 1994 한국원예학회 학술발표요지 Vol.12 No.1

粘土層上에서 連續보의 支點沈下에 關한 硏究

鄭海駿,金八圭 충남대학교 공업기술개발연구소 1975 工業技術開發硏究所論文集 Vol.2 No.2

A continuous beam constucted on clay soils has disadvantage of differential settlements which will continually take place for long time, while it has certain economical and mechanical advantages. On this condition it is advisable to study carefully a continuous beam for its application in practice by means of experimental investigation through a phisical model. The theoretical settlements are obtained by using the coefficients of consolidation calculated from the average of at least five consolidation tests performed on the samples, and the observed settlement by a rather accurate gauge. The results showed that the observed values are likely to be in close agreement with the theoretical values calculated on the basis of R. L, Schiffman's theory. During the first one hour's loading, a critical differential settlement occurs and then decreases to zero in 8 hours.