龍仁地域의 資源植物 調査 硏究

兪在殷 명지대학교자연과학연구소 1991 자연과학논문집 Vol.9 No.-

The survey aims to investigate the distribution of plant resources in the Yong-in area, to furnish fundamental academic data for this field of discipline and to stimulate the residents in the region to increase their income with the exploitation of useful plants as an income source and in case of war, as emergency rations for soldier. This surveying study will be summaried as follows; 1. Plant resources distributed along the area were totally 91 families, 260 genera and 416 species. 2. Epimedium koreanum Nakai and Acanthopanax sessiliforum etx. medicinal Plants were distrbuted. 3. The surveyed area was consist mixed that deciduous broad-leaved trees including Quercus acutissima, Quercus mongolica and Quercus serrata.

Some Properties of Splitting Fields for finite Groups and C-characters

Cho, Eui-Whan 명지대학교자연과학연구소 1991 자연과학논문집 Vol.9 No.-

It is well-known that the representation theory which was begun at the last cen-tury is a very powerfull tool in the study of functional analysis([3]). In this note, we shall prove some properties with respect to the representation theory of finite groups (Theorem 2 and Theorem 4). In the sequel, by a group G we mean a finite group without any statements. In this note, we shall use the following notations.

A Generalization of the Knaster-Kuratowski-Mazurkiewicz Theorem on H-Spaces

Bae, Jong-Sook,Chae, Soo-Seon 명지대학교자연과학연구소 1991 자연과학논문집 Vol.9 No.-

In 1961, Fan[5] showed an infinite dimensional version of the classical Knaster-Kuratowski-Mazurkiewicz theorem (briefly KKM theorem) [12]. The significance of KKM theorem) [12]. The significance of KKM theorem was reinforced by Fan who gave a variety of its applications in a series of papers(see[6]). And also Fan's results were developed by many authors and applied in studying fixed point theorems, minimax and variational inequalities, matching theorems, intersection theorems for sets with convex sections and many other fields.

한국 전통음식 문화의 전승 방안 : 현행 교육과정을 중심으로 Follow the present education courses

조후종 명지대학교자연과학연구소 1991 자연과학논문집 Vol.9 No.-

I suggest the change of education curriculum for the right transmission of Korean food culture. 1. In primary school, we should educate the practical courses form first year. 2. In middle school, home economics courses should be essential. 3. In high school, we should adopt the home economics courses as the essental subject bin any part. 4. In every adult education center, we should educate the program of transmission and preservation of the Korean food culture.

實數에서의 寫像에 關한 混沌, 軌道 및 週期的 性質

梁承甲,金碩浩 명지대학교자연과학연구소 1991 자연과학논문집 Vol.9 No.-

In order to understand the theory on chaos easily, we investigate periodic properties under the iteration of functions by using orbit diagram. In Section 1 of Chapter 2, we examine periodic properties of the the quadratic function, F??(x)=x²+c, with the range -2??c??1/4 and -1??x??2. In Section 2, we examine periodic properties of the logistic family, F??(x)=ax(1-x), with the range 0?a?4 derived from X??+₁= F(x)=??(x??-??) by Newton's method to solve x²+ 1=0. In Section 3, we examine periodic properties of the sine family. Fλ(x)=λsinx, with range 1??λ??π and π/4??x??π.

On the Nearly Periodic and Prolongation Flows

Kim, Young-Key,Min, Kyung-Jin 명지대학교자연과학연구소 1991 자연과학논문집 Vol.9 No.-

유아교육용 과학, 수학 CD-ROM Title의 교육과정 분석 및 발달적 적합성 평가 기초연구

김선영,고희자 명지대학교 자연과학연구소 1997 자연과학논문집 Vol.16 No.-

본 연구는 현재 출시되고 있는 유아교육용 CD-ROM Title 중 과학, 수학 교육용으로 활용될 수 있는 것을 대상으로 하여 현행 유아 교육과정과의 관련성을 분석하고, 발달적 적합성을 평가하기 위한 기초 연구이다. 국내 제품 또는 한글화된 외국 제품인, 총 17개의 CD-ROM Title이 평가 대상으로 선정되었고, 교육부가 고시한 유치원 교육과정에 제시된 교육 내용과 Haugland와 Shade의 교사용 평가 체크리스트가 분석과 평가 준거로 각각 사용되었다. 연구 결과, 대부분의 CD-ROM Title은 수학 교육용이었으며 과학 교육용은 크게 부족하였고, 광범위한 교육 내용의 선정이 필요한 것으로 나타났다. 또한, 유아, 교사, 기술 측면에서 전반적으로 발달적 적합성이 매우 뛰어난 CD-ROM Title의 수는 매우 적고, 대부분이 우수한 면과 부족한 면을 동시에 갖고 있는 것으로 평가되었다. The present study was designed to analyze the curriculum contents and evaluate the developmental appropiiateness of CD-ROM Titles for kindergarten science and mathematics. Seventeen CD-ROM Titles which were Korean product or Korean version of foreign product were selected for the study. For the curriculum contents, the CD-ROM Titles were analyzed based on the science and mathematics content areas presented by the Ministry of Education. For the developmental appropiiateness, the CD-ROM Titles were evaluated using a checklist for evaluation software developed by Haugland and Shade. Results of the curriculum analysis revealed that most of the CD-ROM Titles were focused on the mathematics contents, while a few of them were involved the science contents. According to the evaluation of the developmental appropriateness, most of the CD-ROM Titles had both good and poor qualities in child, teacher, and technical features.

n차원 호모로지 R-기군들의 완전열에 관하여

Kim,Gi Ik,Kim,Keon Ho 명지대학교자연과학연구소 1989 자연과학논문집 Vol.7 No.-

Let h be a homomorphism of a lower sequence S into a lower sequence T of R-modules. For every integer n, let ?? and define a function ?? ?? for every ?? and every ?? We can have that the following sequence is exact : ?? Where ?? is induced by h, ?? is induced by the injection ?? defined by ?? for every ?? and ?? is induced by the projection ?? defined by ?? for every (s,t)??

마늘과 양파로부터 프로스타글란딘의 추출 및 확인

Kim, Soo-Chan,Yoon, Cheonho,Kim, Song-Chon 명지대학교자연과학연구소 1991 자연과학논문집 Vol.9 No.-

For the purpose of examining whether prostaglandins exist in plant materials. an attempt was made to develop an analytical method to extract and identify prostaglandins thexefrom. Prostaglandin extracts were obtained by a multistage solvent extraction, and they were separated and identified by TLC,HPLC and GC-MS. Main components of prostaglandins were efficiently extracted from the garlics and onions using a variety of complex solvents, In the TLC experiments, it was conformed that extracts of the garlics and onions contained the similar components to PGE₁ and PGA₁. HPLC chromatogram showed that PGE₁ in the garlics and onions existed in very larger quantities than PGA₁. Structure of PGE₁ was identified in the garlics by GC-MS in the MICI mode following the derivatization procedure of prostaglandins.

고온 초전도체 Y₁-x Gdx Ba₂Cu₃O7-y의 임계전류밀도에 관한 연구

전인,송승기,최덕,김영호 명지대학교자연과학연구소 1991 자연과학논문집 Vol.9 No.-

고온 초전도체 Y₁-??Nd??Ba₂Cu₃O??-??(x=00.1, 0.2, 0.3,...,1.0)를 고상 반응법을 이용하여 제작하였다. 온도에 따른 전기적 비저항의 측정과 자기적 감수율의 측정을 통하여 구한 초전도 전이온도는 92.1∼93.5K 사이에 존재하였다. 77K에서 시료의 자기적 감수율은 -5.06∼-6.83Χ10??emu/㎤ㆍOe 사이에 존재하였으며, 상온에서의 비저항은 x=0.6인 시료를 제외하고 x가 증가함에 따라 감소하였다. 수송 임계전류밀도는 자기장이 0일때 51.6∼80.6 A/㎠사이에서 측정되었으며 x가 증가함에 따라 대체로 증가하였다. 자기장을 가해준 상태에서 측정한 수송 임계전류밀도 는 자기장이 증가함에 따라 급격히 감소하였다. 자기 이력곡선으로부터 Bean의 공식을 이용하여 구한 임계전류밀도는 수송 임계전류밀도의 0.8∼2.7Χ10??배로 크게 나타났다. High-Tc superconductors Y₁-??Nd??Ba₂Cu₃O??-??(x=0.1, 0.2, 0.3,…,1.0) have been prepared by solid state reaction method. The superconduction transition temperatures determined by the temperature dependence of electric resistivity and magnetic susceptibility are in the range between 92.1 and -6.83Χ10??emu/㎤·Oe and the resistivities at room temperature are decreased as increasing Gd contents except for the value of x=0.6 sample. Transport critical current densities have the value of 51.6∼80.6 A/㎠ and are generally increased with increasing the magnetic field. Magnetic critical current densities obtained from the magnetization curve using the Bean's law are about 0.8∼2.7Χ10??times of the transport J??.