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김응환,오정학 한국학교수학회 2001 韓國學校數學會論文集 Vol.4 No.2
The teaching-learning method utilizing Web makes it possible for the students take the initiative in any field and offers the teaching strategy, methodology and teaching-learning materials suitable for students' ability and standard. The purpose of this study is to investigate the characteristics of WBI in mathematics class for the effective teaching and learning focusing on the unit 'Function' in the 1st grade of middle school and verify its effectiveness by developing the WBI programs which can progress learning achievement and applying them to math class. Two hypotheses were established for this study. Hypothesis 1 : There will be meaningful difference between the group that studies under WBI and the one that doesn't. Hypothesis 2: There will be meaningful difference in the attitude and interest toward learning between the group that studies under WBI and the one that doesn't. In order to find out the result, I have made a comparative analysis through t-verification on the object of two classes of the 1st grade in P middle school that I have been working for. The result shows that the class utilizing WBI is more effective than the traditional lecture-oriented class , since there is a meaningful difference between the control group and experimental one and also that the class based on WEB has a great influence on students' interest and positive attitude toward math class.
김준환,김영권,홍권의 건국대학교 산업기술연구원 1997 건국기술연구논문지 Vol.22 No.-
Optical communications through the atmosphere offer the potential of relatively inexpensive high speed line-of-sight communications. Furthermore, the performance of any gound-to-ground or satellite-to-ground optical link will be affected by the atmosphere. The atmosphere is an imperfect medium for transmission of optical communications signals. It is not homogeneous and further, it is dynamic in its behavior. The atmosphere can be considered as producing some effects on transmission of light. These effects are turbulence, absorption, and scattering. All three can reudce the amount of light energy that is collected at the receiver and corrupt the data being sent. Although the effect of attenuation due to absorption/scattering can be overpowering in a link design, and can be compensated with judicious choice of wavelength of light signal, the fluctuations in amplitude and phase due to turbulence give rise to a number of important effects.
김응환,박석윤,박래현 충남대학교 기초과학연구소 1997 忠南科學硏究誌 Vol.24 No.2
This thesis suggests an estimation procedure in the simple linear calibration model when the variation of error term are propotional to the independent variables. And it is proved that we can obtain the finite closed confidence interval of unknown controlled variable under the condition that the null hypothesis of zero slope is rejected.
치아회분과 석고를 혼합하여 제작한 block의 inlay 매식후 치유과정에 관한 실험적 연구
김영균,여환호,박인순,조재오 大韓顎顔面成形再建外科學會 1996 Maxillofacial Plastic Reconstructive Surgery Vol.18 No.2
The purpose of this investigation was to determine the possibility of clinical use of toothash-plaster block implant material with ratio of 2 : 1 weight. We made 1cm diameter round partial thickness defect at both sides of calvaria. Right side was implanted with block and left side was not implanted as a control site. The following results were obtained : 1. In gross examinations, the implanted site had a hardness on palpation and the margin with host bone was not identified clearly at 12 weeks after operation. But control site contained the fibrous tissue. 2. In the light microscopic examinations, most of the implanted sites were repaired by newly-formed bone at 12 weeks postoperatively. 3. At 8 weeks postoperatively, the implanted particles were divided into small granules and the amount was decreased gradually. Some remained particles were united directly with newly-formed bone. But the implanted particles still remained partly at 24 weeks postoperatively. 4. There was no significnat difference between the experimental and control site at 24 weeks postoperatively.
김응환 공주대학교 사범대학 과학교육연구소 1997 과학교육연구 Vol.28 No.1
신뢰구간의 지도는 고등학교의 수학교육분야에서 추측의 한 방법으로서 매우 중요한 위치를 점하고 있다. 또한 신뢰구간의 개념이 이해하기 어려운 특성을 지니고 있다. 본 연구에서는 현행 12종의 고등학교 수학교과서를 분석 검토하여 그 결과를 논하였으며 이를 바탕으로 보다 효과적인 신뢰구간의 지도를 위한 방법을 제안한다. The teaching of the confidence interval is very important in mathematics education at highschool as a method of the statistical inference. It is hard to understand that the concept of the confidence interval. In this paper, I discuss and compare with the context of the confidence interval in the 12 textbooks of mathematics used at highschool. And I propose more effective teaching method of the confidence interval.
김응환,이석훈 충남대학교 기초과학연구소 1999 忠南科學硏究誌 Vol.26 No.1
This article deals with the problem that considered the crisp partition in the fuzzy clustering. We interpretate the result of the fuzzy clustering and suggest one appropriate algorithm that is convenient for use with decision of ambiguous class. Finally we show the implementation using an artificial data.
남원시 생활하수가 요천 수질오염에 미치는 영향에 관한 연구
김환기,김태근,이영우 全北大學校 附設 都市및環境硏究所 1995 都市 및 環境硏究 Vol.10 No.1
The Yo stream(drainage area: 526.08㎢, length: 52.0㎞) is one of the branchs of the Seom Jin river. In order to evaluate effects of the sewage in Nam-Won City(I) on the water pollution of the Yo stream, water qulity analysis and estimate the pollutant discharge rate were carried out at six sites in the Yo stream basin from December 1994 to September 1995. The results of research are summarized as follow: 1. According to the water quality of six sites evaluated by BOD, ST1 is classified into I grade, ST2 and ST3 are II grade, ST4∼ST6 sites are III grade. 2. Amount of total BOD load from the Yo stream basin was estimated 11,810㎏/day of which 13.9% was contributed by land, 0.1%, was contributed by industrial waste water, 43% was contributed by population and livestock, respectively. 3. As Nam-Won city(I), discharge rate and effluence rate of BOD, SS were estimated 28.4%, 10.6% and 20.6%, respectively. 4. Since Nam-Won city sewage treatment plant started operation, BOD, SS reduction rate of Nam-Won city(I) were forecasted 36.1% and 20.6%, respectively.
중학교 수학 7-가 교과서의 비교 연구 : Focused on the 7th Curriculum of Mathematics
김병호,김응환 한국학교수학회 2002 韓國學校數學會論文集 Vol.5 No.1
This study is to compared with 7-ga mathematics textbooks of 13 types in the middle school by 7-th curriculum. A synopsis of the Analysis and comparison about the contents of these textbooks is as follows. - The order of contents almost is same about the title and contents in 13 types of textbooks. - It is very important that the definition of terminology should be simple and correct. I investigated the terminology in thirteen textbooks of material at 7-th curriculum. - Most of their textbooks present the motivation of learning mathematics with resource of life such as a story of mathematics and famous mathematicians. - The chapter about numbers and operations has the biggest volume of all. - The evaluation of lessons presents at the each end of chapters with many problems as levels.
일본의 중학교 수학과 신교육과정 소개와 학습량 30% 감축에 대한 논의
김응환,이석훈 한국학교수학회 1999 韓國學校數學會論文集 Vol.2 No.1
The purpose of this paper was to discuss critical issues of 30% reduction and introduction of the contents for new Mathematics Curriculum at middle school in Japan in 2002. This paper consisted of three part: (1) The contents of the new mathematics curriculum in middle school in japan. (2) Discussion about critical issues of 30% reduction of the contents for new Mathematics Curriculum. (3) Proposal of the point of view about 2000 mathematics curriculum in Korea. The authors pointed out that the reduction of the mathematics curriculum in Korea should be considered of a true reduction more carefully.