고등학교 과학수업 실태 조사 연구

金壽善 建國大學校基礎科學硏究所 1998 理學論集 Vol.23 No.-

1980년대 들어서면서 학문중심 교육과정의 문제점이 드러나게 되자, 과학-기술-사회(STS)적 접근을 통한 과학교육 개혁 운동이 일어났다. 제6차 교육과정에 반영된 STS 과학 교육 운동은 과학자를 양성하기 위한 과학교육이 아니라 학생들의 경험이나 일상 생활과 관련있는 소재를 중심으로 일상 생활에서 부딪히는 문제를 해결하는 능력인 과학적 소양(scientific literacy)을 기르는 것을 그 목표로 삼고 있다. 본 연구에서는 현재 학교에서 이루어지고 있는 과학교육이 과학적 소양을 기르기에 적합한지를 진단하고, 이를 바탕으로 과학적 소양을 키우기 위한 과학교육의 개선 방안을 마련하는 것을 그 목적으로 하였다. 연구의 목적을 달성하기 위해 과학 수업과 실험, 대입 시험에 관련된 설문지를 개발하고, 서울 소재 인문계 고등학교 3학년 학생들에게 투입, 그 응답을 분석하고 과학교육의 문제점을 추출하였다. 실태조사 결과 현재 학교에서 이루어지고 있는 과학교육은 다음의 문제점들을 가지고 있었다. 1) 개념전달 위주의 과학 교육 2) 실험 수업의 여건 미비 3) 학생들의 인식 부족 및 동기 상실 4) 과학과목의 편중된 선호경향 5) 상급 학교 입학 시험의 영향 6) 시청각 자료의 활용 미흡 이와 같은 문제점을 해결하기 위해 개선방안을 다음과 같이 제시하였다. 1) 상급학교의 입시문제는 하급학교 교육목표의 성취도를 평가할 수 있도록 출제되어야 한다. 2) 다양한 교수 보조 자료가 개발되어야 한다. 3) 효과적인 실험 수업을 위해 학급 인원, 수업 진도를 조정하고, 실험 설비들을 갖춘다. 4) 교사의 과학적 소양과 과학교재 교구를 다룰 수 있는 능력을 신장시켜야 한다. In 1980s, weak points of academic curriculum were discovered. As a result, the reform movement of science education began through the STS approach. The aim of the STS science education movement in 6th curriculum is not to train students as scientists but to cultivate their scientific literacy, the ability to solve the problems that face us in daily life, by making the best use of students' experiences and materials related to their everyday life. In this respect, the purpose of this was to diagnose if the present science education was suitable for the cultivation of scientific literacy and to draw up a remedy for the purpose. To attain this purpose, a questionnaire were made related to science class, experiment and entrance examination for university pose questions to seniors of high school is located in Seoul, their responses were analysed, and then several problems of present science education were discovered like this: 1) Teaching methods centered upon concept learning 2) Lack of the conditions for experiment education 3) Lack of student's recognition to purpose of science class 4) Unbalanced preference tendency of science subjects 5) Effect of entrance examination to science class 6) Deficiency of applying audio & video materials to education To solve the problems mentioned above, some improvement measures were presented as follows. 1) Senior high school and college entrance examination questions must be set to be able to measure the degree of achievement of the educational aim in a school of lower grade. 2) Various teaching aid materials must be developed. 3) Conditions for experiment must be made, laboratory, classes, number of students, etc. 4) Science teachers must be retrained for teaching scientific literacy.

P16(Ink4a) Overexpression Inhibited Growth of HCC Cell Lines Through Either pRB Dependent or Independent Pathway

Park,Taek Kyu,Jung,Yu Jin 建國大學校基礎科學硏究所 1999 理學論集 Vol.24 No.-

는 세포주기의 G1기에서 cyclin D1과 cdk4/6의 결합을 방해하는 강력한 inhibitor로 RB 유전자산물의 인산화를 조절한다. 먼저 7종의 사람 간암(human hepatocellular carcinoma; HCC) 세포주를 대상으로하여 p16의 분자상태를 조사하였다. 대상 세포주중에서 SKHepl과 SNU449 세포주는 locus의 homozygous 결손을 나타내었고 SNU398은 전사후 조절단계에서의 비활성화로 인한 기능의 상실을 나타내었다. 이는 가 간암의 carcinogenesis에서 중요한 역할을 함을 시사한다. 또한 유전자 치료를 위한 의 간암세포성장 억제 효과를 알아보기 위하여 p16 유전자를 포함한 아데노바이러스 벡터를 간암세포주에 감염시켰다. Hep3B, SNU398, SNU449에서는 ??가 세포의 성장을 저해했으나 Chang liver, HepG2, SNU182, SKHep1에서는 세포의 성장 저해를 나타내지 않았다. 특히 SKHep1에서의 성장저해 실패는 재조합 아데노바이러스의 낮은 transduction efficiency 때문으로 밝혀졌다. 또한 pRB가 존재하는 SNU449에서 에 의한 성장 저해 작용시 세포주기는 G0/G1기에 머물러 있었으나 pRB가 없는 Hep3B에서는 그렇지 않았다. 이러한 결과는 간암에서 의 유전자치료 대상으로서의 가능성을 제시하는 것으로 pRB에 의존하거나 또는 비의존적이거나 간에 가 암세포 성장을 방해할 수 있다는 것을 의미한다. The is a major inhibitor of cyclin D-cdk4/6 complex and regulates the phosphorylation of the RB gene product. To evaluate the therapeutic efficacy of on human hepatocellular carcinoma cell lines (HCC), we analyzed the inactivation and growth inhibitory effect of in seven HCCs. Among seven HCC cell lines tested, SKHep 1 and SNU449 cells showed homozygous deletion of locus, and SNU398 cell might be inactivated at posttranscription level, indicating the importance of in HCC carcinogenesis. Adenoviral transduction of gene inhibited the cell growth in Hep3B, SNU398, and SNU449, but not in Chang liver, HepG2, SNU182, and SKHepl, which shows gene deletion. Failure of growth inhibition in SKHepl is due to low transduction efficiency of recombinant adenovirus. While mediated growth inhibition of pRB-positive SNU449 was arrested at the G0/G1 phase of cell cycle, but that of pRB-negative Hep3B was not. These results suggest that therapeutic efficacy of gene might be considered on the ability of adenoviral transduction and the cytotoxicity of adenoviral vector itself in HCC. Moreover, growth inhibitory effect of ?? could be exerted through either pRB-dependent or-independent pathway.

Absorbing Boundary Conditions to Helmhotz Equation on a Circular Domain

Kwon, Ohin 建國大學校基礎科學硏究所 2002 理學論集 Vol.27 No.-

The treatment of waves in the frequency domain requires a boundary condition to truncate original domains into tractable finite domains. Higher order absorbing boundary conditions are not matched to the general second order elliptic equations because their differential order is not lower than the differential order of main equation. In this paper, we show the uniqueness of the solution to Helmholtz equation with the second order absorbing boundary conditions on a circular domain. Next, we modify the first or second order absorbing boundary conditions to get the more accurate boundary conditions and show L^2-stability for he modified first order absorbing boundary condition on a circular domain.

폴리올 분석을 위한 구리변성 탄소전극

양희진,박종만 建國大學校基礎科學硏究所 2002 理學論集 Vol.27 No.-

Polyacrylonitrile(PAN)-based copper-modified carbon electrode was prepared by pyrolyzing a thermoset pellet of PAN and Cu powder mixture at 800 under N_2 atmosphere. The modified electrode material was highly conductive and has good mechanical properties. The copper particles were typically several micrometers in size and randomly distributed through the electrode matrix. The electrode revealed similar electrochemical behavior to CuO-modified polymeric composite electrode previously reported. The electrode exhibited high electrocatalytic activity in the oxidation of various polyhydroxyl compounds. Cyclic voltammetric behavior of the electrode in alkaline solution and organic solvent was studied.

The Goldreich-Goldwasser-Halevi cryptosystem using polynomial representations

Paeng, Seong-Hun 建國大學校基礎科學硏究所 2003 理學論集 Vol.28 No.-

A public key cryptosystem based on the closest vector problem was suggested by Goldreich, Goldwasser and Halevi [2]. We suggest an improvement of this system by suing polynomial representations.

Toluene의 Rayleigh ratio와 온도 의존성에 관한 연구

金容培 建國大學校基礎科學硏究所 1983 理學論集 Vol.8 No.-

Rayleigh ratio has been measured for toluene as a funtion of temperature. The following relationship was obtained for a wavelengh of incident light of λ??=435.8nm; ??=(50.48+0.2638 t)×?? where t is temperature(℃). Light scattering photometer was calibrated with benzene purified by fractional distillation by using a value of Rayleigh ratio for benzene of ??=46.5×??. In order to verify the validity of the calibration molecular weight determination was run on sucrose. The values of Rayleigh ratio for toluene was compared with (a) similar data in the literature, (b) values calculated using the Einstein equation with ?? data, and (c) values calculated from various theorectical or empirical expression for ??. Best overall agreement of total ?? for toluene is found by using the Einstein equation with thermodynamic variable T.

일감호 주변지역의 地下水 賦存

최무웅 建國大學校基礎科學硏究所 1985 理學論集 Vol.10 No.-

The main purpose of the present study is to clarify groundwater capacity in Ilkam catchment area. Present estimation indicates that two flow lines of groundwater, the total budget is about 91,840.65㎥ and might be expected to give a prediction of the large amount of water capacity at bore hole No. W4 on a Ilkam catchment area.

Se1-xTex 薄膜의 光電導特性

朴鼎德 建國大學校基礎科學硏究所 1985 理學論集 Vol.10 No.-

This study are investigated the photoconductive properties of the ?? thin film which was deposited by means of vacuum evaporator. The ?? thin film samples are prepared on the slide glass substrate at laboratory temperature with mixture in various mol ratio x equal to 2%, 4%, 6%, 8% and 10% of Te to Se. According to the experiments are obtained the results as follow. 1. The resistivity of the ?? thin film is measured about 1KΩ-cm at laboratoly temperature. 2. The photocurrent is measured about 2㎂ at 1,000 Lux illumination in the laboratory temperature. 3. The spectral photosensitivity of the ?? thin film are investigated in wave length from 300 to 700nm range and its maximum photosensitivity is found at about 500nm.

19F NMR Study of Fluorinated High Tc Superconductor La Sr CuCo(O F)₄

Lee,Moohee 建國大學校基礎科學硏究所 1999 理學論集 Vol.24 No.-

불소를 치환한 (LaSrCuOF) 분말시료를 고온고상법으로 제조하고, 그 특성을 핵자기 공명실험으로 측정 분석하였다. ?? 핵자기 공명 결과, 불소원자가 65%까지 단일상으로 치환된 것으로 판명되었다. NMR 스핀-격자 완화율은 Korringa 온도 의존성을 보였는데, 이것은 불소가 미약하지만 금속상태로 도입되었음을 입증한다. 핵자기 공명실험과 X-ray 회절측정을 분석한 결과, 불소가 육면체의 꼭지점에 있는 산소를 치환해 들어 간 것으로 보여진다. Polycrystalline samples of fluorinated high Tc superconductor with nominal compositions (LaSrCuOF) were prepared by solid state reaction techniques and studied by pulsed nuclear magnetic resonance (NMR) measurements. NMR results on the sample showed that 65% of the expected amount of fluorine was incorporated in a single phase which became superconducting at 37 K. Korringa temperature dependence of spin-lattice relaxation time T₁ was observed in the normal state of LaSrCuOF suggesting that fluorine is in a weak metallic environment. Analysis of NMR data and X-ray diffraction experiments suggests that the substitutional site of fluorine is most likely the apical oxygen site.

초타원곡선 암호

금종해 建國大學校基礎科學硏究所 1999 理學論集 Vol.24 No.-

기존의 대표적인 암호체계인 RSA 암호법, 타원곡선 암호법 등에 비하여 안전성 및 실용성에서 우월할 것으로 예측되는 초타원곡선 암호법에 대하여 소개한다. 이는 1988년 N. Koblitz에 의하여(대수기하학에 바탕을 둔) 이론적 토대가 제공된 이후, 외국의 학자들에 의해 많은 진전이 있었으나 아직 실용되지는 않았다. 본 논문에서는 이러한 이론적 토대 및 진전을 검토하고 실용화 방안을 모색한다. 특히 초 타원 곡선 및 그의 자코비 다양체의 연산을 소개하고 초타원곡선 암호의 안전성에 관한 문제, 곧 이산 로그 문제를 몇 가지 예를 통하여 논한다. Starting in about 1988, the theory of hyperelliptic curves over finite fields has been applied to construction of cryptosystems. In this paper we shall discuss this. The main reason for interest in cryptosystems based on hyperelliptic curves is that these curves are a good source of a huge number of finite abelian groups having a rich algebraic structure.