探究的 科學學習을 위한 中·高等學校 科學室 운영 실태에 대한 考察

李官敎 조선대학교 기초과학연구소 1981 自然科學硏究 Vol.4 No.1

The trend of modern science education is to study science investigatively by virtue of experiment in the laboratory, by the students themselves rather than the teacher. Accordingly, this paper is an attempt to grasp the actual condition of supervision of science laboratories in secondary schools through questionaires given to science teachers in secondary schools and an inquiry into improvement measures for establishing an investigative environment and furthering degree of the student participation in experimental learning.

莞島東部沿岸의 海洋特性에 關한 硏究

曺炷煥,鄭貴泳 조선대학교 기초과학연구소 1990 自然科學硏究 Vol.13 No.1

An investigation on the physical and chemical condition of the eastern sea waters of Wando Island had been carried out during from February, 1985 to November, 1988, and the followings are the results. Water temperature ranged from 4.9 to 26.4℃. The inner sea waters was lower as much as 2℃ in winter, but higher as much as 1∼3℃ in summer than the outer sea waters. Salinity ranged from 23.60 to 34.21‰, highest in February and lowest in September, and there was the greatest salinity fluctuation near Shinji(St. 1) on the account of the influx of land water. Dissolved oxygen content ranged from 3.56ml/l, high at st. 1 that is the site of inner sea, but low at outer sea, and highest in February and lowest in August. The phosphate concentration ranged from 0.10 to 0.98㎍-at/l, the dissolved inorganic nitrogen (DIN) ranged from 0.54 to 7.67 ㎍-at/l, high in spring and low in September, and gradually increased annually. Transparency was in the range of 0.4∼11.0m, low at st.1 and high at st.5 the is located in the outer sea. The concentration of total suspended solids was in the range of 1.2∼53.6mg/l, This showed reverse distribution to the transparency, and its relationship to the transparency at st.5 was S=11.4087-1.2946T(r=0.6577). The distribution rate between DIN and PO_4-P was more stable at bottom that at surf ace and more stable in outer sea than in inner sea waters as well.

Finger Prints in Normal Korean Population

Cho, Ching,Cho, Suck Ju,Kim, Hong Sub 조선대학교 기초과학연구소 1987 自然科學硏究 Vol.10 No.1

正常 韓國人 男子群 250名, 女子群 250名을 硏究對象으로 指紋을 分析하였는 바 다음과 같은 結論을 얻었다. 1) 兩手에 나타나는 指紋의 出現頻度를 調査하였다. 男子群에서 弓狀紋 2.7%, 蹄狀紋 42.8%, 渦狀紋 54.5%이었고, 女子群에서 弓狀紋 4.6%, 蹄狀紋 49.3%, 渦狀紋 46.1%이었다. 男女群 사이에는 紋形에 對하여 統計學的을 有意한 差異가 있었다. 2) 男子群의 手指에 나타나는 紋形의 對稱에 대한 出現頻度는 相互 類似하였다. 5雙의 對應指 중에서 小指가 男女群에서 對稱頻度가 가장 높았으며, 示指의 對稱頻度가 가장 낮았다. 3) 個體別로 指紋 紋形의 對稱頻度를 調査하면 4雙 모두 對稱인 것이 男子群(33.6%)에서 가장 많이 出現하였으며, 女子群에서는 5雙인 것이 가장 많이 出現하였다. 4) 男子群의 兩手에 나타나는 弓狀紋의 出現減少 順位는 Ⅱ>Ⅲ>Ⅰ>Ⅳ=Ⅴ이며 女子群은 Ⅱ>Ⅲ>Ⅰ>Ⅴ>Ⅳ의 順으로 減少하였다. 蹄狀紋의 出現 減少 順位는 男子群에서 Ⅴ>Ⅲ>Ⅱ>Ⅰ>Ⅳ, 女子群에서 Ⅴ>Ⅲ>Ⅰ>Ⅱ>Ⅳ의 順으로 出現하였다. 渦狀紋의 出現減少 順位는 男女群 모두에서 Ⅳ>Ⅰ>Ⅱ>Ⅲ>Ⅴ의 順으로 出現하였다. 5) 紋形强度指數(PII)는 男子群은 14.70, 女子群은 14.01로 算定되었다. 6) 總?線値(TRC)는 男子群 148.34, 女子群 138.96을 보여주고 있다. Fingerprints of 500 Koreans have been analyzed. Samples were grouped into 250 male students and 250 female students. Percentile occurrences of pattern types on both hands exhibit 2.7%, 42.8% and 54.5% for the male students; 4.6% 49.3% and 46.1% for the female students in the arch, the loop and the whorl in order, respectively. Between inter-groups there was significant difference in three types o finger pattern. Two groups demonstrate a closer resemblance of the frequency for the bimanual symmetry of the pattern type in each finger. Total ridge counts showed 148.34 and 138.96 for the male students and the female students in order respectively. There is significant difference for total ridge female between the two groups.

Variance of an Unbiased Estimate of the Population Mean under Proportional-Neyman Allocation

Cho, Byung Yup 조선대학교 기초과학연구소 1987 自然科學硏究 Vol.10 No.1

The evaluation of the variance of an unbiased estimate of the population mean under Proportional-neyman allocation is by no means straight forward and involves complicated algebra. The variance in the case of K=2 was evaluated in 1981〔4〕. And Carrillo considered the problem of estimation of variance in stratified sampling subsequent to preliminary test of signigicance of the homogenuity of strata variances 〔1〕.

On the f-injectivity and annihilator condition

Kim, Sun-Ah 조선대학교 기초과학연구소 1984 自然科學硏究 Vol.7 No.1

The Admissibility of Bayes Estimators

Choi, Kuey-Choung 조선대학교 기초과학연구소 1987 自然科學硏究 Vol.10 No.1

This paper treats the problem of estimating an arbitrary parametric function in the case when the parameter and sample spaces are countable and the decision space is arbitrary. Using the notions of a stepwise Bayesian procedure and finite admissibility, a theorem is proved which shows that under some assmption, every finitely admissible estimator is unique stepwise Bayes with respect to a finite or countable sequence of mutually orthogonal priors with finite supports. Under an additional assumption, it is shown that the converse is true as well. The first result can be also extended to the case when the parameter and sample spaces are arbitrary, i.e., not necessarily countable, and the underlying probability distributions are discrete.

Zn_xCd_1-xS 박막의 물성연구

최성휴 조선대학교 기초과학연구소 1987 自然科學硏究 Vol.10 No.1

ZnχCd_1-ΧS thin films were prepared by the electroless deposition method. The ZnxCd_1-xS thin films deposited by this method have many of the advantages such as the ease of coating large areas and simplicity of process. The ZnxCd_1-xS thin films had (100), (101), (102), (110), (103), (002), (200) crystal planes, indicating that the crystal structure was hexagonal. The absorption edge of the ZnxCd_1-xS thin films varied with x, the corresponding wavelength to the edge 354 nm and 527 nm appeared at x=1 and x=0 respectively. The energy gap of ZnxCd_1-xS thin films changed with x variance in the composition, being within2.35~3.50Ev.

Oen Nen H_4 거대고리 리간드를 가지는 이온교환수지 합성과 UO^2+_2의 분리특성

김일두,김호두 조선대학교 기초과학연구소 1987 自然科學硏究 Vol.10 No.1

The Oen Nen-H_4, macrocyclic ligand with the donor sets which the complex of UO^2+_2 could stably be formed has been synthesized from salycilaldehyde, 1.2-dibromoethane and diaminoethane. The resin separating UO^2+_2 selective1y has been synthesized by copolmerizating the chromethylated styrene-DVB and Oen Nen-H. The adsorptive characteristics and behavior of elution of the uranium (Ⅳ) metal for the resin mentioned above were discussed in various experimental conditions. The styrene-DVB copolymer with Oen Nen-H group was stable at high temperature (350℃) and in the strong acid and base, and showed the structural stability for a long use. The optimum condition of selective adsoption of uranyl (Ⅱ) nitrate solution for the resin with Oen-H_4 group was pH4. O-10.5.In dilute sample solution, UO^2+_2 was adsorbed well by the resin of copolymer with 1% cross linkage of Oen Nen-H type, but adsorptivity of UO^2+_2 was decreased in the resin of copolymer with crosslinking more than 4%.

全南地域에서의 天文台 設立 最適地 調査 硏究

金永成,朴鍾哲 조선대학교 기초과학연구소 1987 自然科學硏究 Vol.10 No.1

This paper attempt indicate the best sites for setting up an Optical observatory and Radio observatory in Chollanamdo, by studying Topographic, Geologic, Meteorologic and Photographic survey. The topographic survey of the studied areas were mainly checked into three conditions; 1) elevation. 2) occultation from another lights and waves. 3) traffic conditions. The geologic survey were checked into two conditions; 1) bed rocks, or field rocks formation. 2) joints formations. The meteorologic surveys were mainly checked into seven conditions; I) temperatures. 2) precipitation days. 3) wind speed. 4) humidity. 5) rate of clear days. 6) snow. 7) fog, etc. The photographic surveys were only checked into city lights in all directions. The results are as follows: The possible areas for setting up radio observatory are site 1, site 3 and for optical observatories are site 8, site 6.

海南地域에 分布한 徵文象花崗岩의 岩石學的 및 構造力學的 硏究

申仁鉉,柳贊洙 조선대학교 기초과학연구소 1987 自然科學硏究 Vol.10 No.1

This study is on the micrographic granites of the Cretaceous around Mt. Duryum, Mt. Daedun, and at Haenam in Chollanamdo. Precise field research was made several times to perform this study and 150 samples were gathered. Seventy-six thin sections were made of 76 chosen samples which were fresh, and moda1 analysis was done on 25 thin sections. According to the resu1ts of motal analysis micrographic granites around these research are as come under granite. According to the results of the structural mechanics of the micrographic granites in these reearchs are as predominated strikes N40-50W, and N50-60E. According to Fig.2, these micrographic granites are similar to the distribution of Bulgugsa granites.