마이크로웨이브를 이용한 분말식품의 멸균에 관한 연구

이병룡 西原大學校 基礎科學硏究所 1999 基礎科學硏究論叢 Vol.13 No.-

본 연구에서는 현재 소매점에서 판매되고 있는 T-식품회사의 미싯가루를 이용하여 그 속에 존재하는 오염 미생물을 분리하였고 그 특성을 조사하였으며 효과적인 멸균 방법을 새로이 제안하였다. 완제품 미싯가루 1 그램 중에는 약 5000 여 마리의 세균이 존재하고 있었으며 그 미생물들을 형태적, 생리적 특성을 비교하여 분류한 결과 모두 9종류임을 알아내었다. 자외선을 이용하여 멸균을 시도한 결과 120초간 조사하였을 때 살균효과가 약 15% 정도인 것으로 밝혀 졌으며 65℃ 건열을 이용하여 멸균을 하였을 경우 12분간의 처리에서 약 35% 정도의 살균효과를 볼 수 있었다. 가정용 마이크로웨이브를 처리하였을 경우 살균 효과가 현저하게 나타났으며 80초간의 조사로 약 94%의 멸균효과를 얻을 수 있었다. 이런 기초자료를 토대로 공업적 생산에 응용하기 위해 scale-up 공정이 필요하다고 여겨지며 분유를 포함한 분말식품을 효과적으로 멸균하기 위한 공업용 마이크로웨이브 멸균기의 연구가 필요하다고 생각된다. Roasted grain powder from retail market was irradiated with microwave for different periods to improve its hygienic quality. Microwave treatments for 80s and 120s were of the same effectiveness whereas treatment for 60s was less so. I suggest that the microwave treatment is a safe and suitable technique for the decontamination of roasted grain powder compared with the sterilization using UV or dry heat.

의사 결정에 관한 연구

박기양 西原大學校 基礎科學硏究所 2004 基礎科學硏究論叢 Vol.18 No.-

The most important role of management of company is to decide in the opinion of company. The work's of management is to carry out the purpose of company and clear up the subject of all short of problem for concerning the matter. Be faced with difficult problems, management try to get the alternative for those problems with the staff. Management will estimate those alternatives and takes desirable one to achieve the purpose. These type of problem will be presented that are able to take as many slips of paper as you please. This problem first appeared in February 1960 issue of Scientific American[4]. It has come to be known as the beauty contest problem, the secretary problem, the marriage problem and the dowry problem. These type of problem will be presented that are able to take as many slips of paper as you please. To gain any insight into the problem, it is instructive to explore the simple cases first. I will try for the cases N=3, 4, 5 and evaluate the probability of success for each strategy. Even for N=10 there are about 3.5 million cases, while for N=l5 there are one trillion cases so it is impossible to list in every such cases as small case N. We must figure out some abstract methode to estimate the probability of success for rank exceeds those of the first n cards. (1) The best card may be included in n cards defining S_(n). (2) The best card may be preceded by at least e card whose.

달천 유역의 단구지형 비교

박희두 서원대학교 기초과학연구소 2001 基礎科學硏究論叢 Vol.15 No.-

This paper aims 13 compare and consider river terrace landform of lower · middle and upper region in Dalcheon river basin. The result of this paper is as follows. First, The difference of river bed altitude between Chungju Basin (lower Dalcheon river region) and Sanaecheon(upper Dalcheon river region) is 230-240m. The difference of river terrace surface and their relative altitube in Dalcheon river Basin is the same as altitude of river bed in the each region. This is different from Namhangang river which the relative altitude (the difference between the river bed altitude and their river terrace altitude) is growing higher and higher as near as upper Dalcheon river region. Second, there are many old river channel in the middle of Dalcheon river. The old river channel in the middle region of the river is curved. But them of the upper river are liner. There are old river channel which are different from the age of meander cutting in the same region. Third, middle river terrace in the lower river region is clear. But higher river terrace in the upper river region is unclear. Forth, river terrace gravel is subrounded because the transportation distance of them is short.

STUDIES ON THE CONVERGENCE OF FUZZY INTEGTRAL'S

Kim, Young Kuk 서원대학교 기초과학연구소 2001 基礎科學硏究論叢 Vol.15 No.-

Fuzzy 측도에 관하여 수렴하는 함수열의 Fuzzy 적분 결과가 수렴하기 위한 조건은 많이 연구되어 있는 형편인데 이 논문에서는 유한인 零加法 측도공간에서는 a.e. 수렴하는 가측 함수열의 Fuzzy 적분으로 이루어진 수열은 수렴함을 밝혔다. 그리고 Fuzzy 측도가 準加法的인 동시에 Lebesgue 성질을 만족하는 경우엔 수렴하는 가측 함수열의 Fuzzy 적분으로 이루어진 수열이 수렴함을 밝혔다. 또한, 함수열이 疑Fuzzy 측도(Pseudo-in fuzzy measure)에 관하여 단조증가 수렴하면 이들 함수의 Fuzzy 적분들로 이루어진 수열도 수렴함을 밝혔다. In this paper we investigated the convergence of fuzzy integrals and get the following results. First, for finite null-additive fuzzy measure the sequence of a.e. convergent measurable functions is transformed to a convergent sequence of fuzzy integrals under the fuzzy integration. Second, if the fuzzy measure is sub-additive and has the Lebesgue property, then a convergent sequence of measurable functions is transformed to a convergent sequence of fuzzy integrals under the fuzzy integration. Also it is proved that if a sequence of measurable functions converges pseudo-in fuzzy measure monotone increasingly, then the sequence of the fuzzy integrals of these functions converges.

수학교사 양성을 위한 교육의 이상과 현실

김영국 西原大學校 基礎科學硏究所 2003 基礎科學硏究論叢 Vol.17 No.-

수학교육의 발전을 위해서 우수한 교사를 양성하고 재교육하는 것은 대단히 중요한 의미를 갖는 과제이다. 본 논문에서는 수학교육과의 수학교사 양성 교육의 현황을 점검하고 문제점을 알아보기 위하여 다음 사항을 논하였다. 1. 수학교육과의 교육과정을 토대로 해서 이상적인 수학교사를 정의하기 위한 준거를 찾아보았으며 이로부터 이상적인 수학교사의 조건을 논의하였다. 2. 수학교육과 교육과정의 운용 현황과 수학교사 양성 제도로부터 이상적인 수학교사의 양성을 저해하는 문제점을 분석하였다. 3. 이들 문제점에 대한 대안을 제시하고 수학교사 양성 교육에 대하여 몇 가지 사항을 제안하였다.

LOCAL STABILITY OF CAUCHY FUNCTIONAL EQUATION

Park, Kyoo-Hong,Lee, Young Whan,Ji, Kyoung Shin 西原大學校 基礎科學硏究所 2002 基礎科學硏究論叢 Vol.16 No.-

In this paper we prove a local stability of GaˇVruta's theorem for the generalized Hyers-Ulam-Rassias Stability of Cauchy functional equation. AMS Mathematics Subject Classification : 39B73, 39B82, 47B15. Key words and phrases : functional equation, homogeneous function, Hyers-Ulam stability, (modified) Hyers-Ulam-Rassias stability

복하천의 미소환경과 어류군집

변화근,손영목 西原大學校 基礎科學硏究所 2004 基礎科學硏究論叢 Vol.18 No.-

2001년 10월부터 2002년 12월에까지 복하천의 미소서식지에 대한 어류군집을 조사하였다. 조사 수역의 미소서식지는 다교란형 후배습지(Heavy disturbance swamp), 사행여울(Meander riffle), 거석소(Rock type pool), 하중도 사구(Low island sandhill), 천수만(Shallow bay), 샛강(Side stream), 소교란형 배후습지(Light disturbance swamp), 직선하도(Straight a river channel) 등으로 구분되었다. 조사 기간 동안 채집된 어종은 총 6과 26종이었다. 이들 중 한반도고유 어종은 A. yamatsutae, S. gracilis majimae, S. japonicus coreanus, M. jeoni, M. yaluensis, O. interrupta 등 6종(종구성비 23.1%)이었다. 우점종은 Z. platypus와 A. yamatsutae이었으며, 전자는 다교란형 습지, 사행여울, 하중도 사구, 소교란형 배후습지, 직선하도에서 출현률이 가장 높았고, 후자는 거석소, 천수만, 샛강에서 높게 출현하였다. 미소서식지별 출현한 어종은 천수만(St. 5)에서 가장 많은 어종이 출현하였고, 직선하도(St. 8)에서 가장 빈약하였다. 미소서식지 중 다교란형 배후습지(St. 1), 천수만(St. 5), 소교란형 배후습지(St. 7)가 다른 미소서식지에 비해 종다양성이 높았으며, 하천에서 미소서식지가 파괴되면 여기에서 출현하는 어류의 우점도는 급격히 높아지고 조다양도, 균등도, 종풍부도 등은 급격히 감소하는 것으로 나타났으며 이는 서식처 보존의 중요성을 나의미하는 것으로 판단되었다. The fish community and microhabitat in the Bockha Stream was investigated from October 2001 to December 2002. Microhabitat of this water area was divided into 8 sites according to their characters : heavy disturbance swamp, meander riffle, rock type pool, low island sandhill, shallow bay, side stream, light disturbance swamp, and straight river channel. During the surveyed period 26 species belonging to 6 families were collected. There were 6 Korean endemic species: Acheilognathus yamatsutae, Squalidus gracilis majimae, Squalidus japonicus coreanus, Microphysogobio tungtingensis, Microphysogobio yaluensis, and Odontobutis interrupta. Dominant species were Zacco platypus and A. yamatsutae. Species composition was more diverse in heavy disturbance swamp, shallow bay, and light disturbance swamp than in other microhabitats, among them the highest at shallow bay and the lowest at straight river channel.

T_7 phage의 특성에 관한 연구

안경준 西原大學校 基礎科學硏究所 2002 基礎科學硏究論叢 Vol.16 No.-

T_7 phage는 전자현미경 관찰 결과 정이십면체의 구형 head가 보였으며 tail은 잘 보이지 않았다. 조사 대상의 모든 E. coli가 T_7 phage의 숙주 균이었으며 균의 생장 pattern에 따라 감수성에 차이가 있어서 생장이 늦은 균은 감수성이 낮았다. phage의 농도가 희석될수록 용균 속도가 늦었으며, 숙주 균 생장 정도에 따라 T_7 phage를 감염시켰을 때 30분 안에 용균이 시작되었고 그 차이는 나타나지 않았다. T_7 phage의 보관 glycerol을 첨가한 상태에서 -70℃에 보관하는 것이 가장 효율적이었다. According to the observation on the electron microscope, T_7 phage consists of a regular icosahedral capsid and hardly detectable small tail. All E. coli strains tested were sensitive to T_7 phage. The difference of sensitivity was caused by growth pattern of host bacteria. The bacteria host which were growing slowly were less sensitive to T_7 phage. The more phage solution was diluted, the longer lysis of host bacteria was occurred. When T_7 phage was infected, lysis was induced in 30 minutes, but there were no difference according to the concentration of T_7 phage and inoculation time. It was most efficient that when T_7 phage was preserved in -70℃ with glycerol.

德裕山 森林群落의 植物社會學的 硏究

李喜銑,沈載國 西原大學校 基礎科學硏究所 1988 基礎科學硏究論叢 Vol.1 No.-

Mt.Dukyoo is 1,594m high, located in latitude 35。51'N and longitude 127。45'E, and very famouse mountain in Korea. The vegetation, soil and topographical factors of the mountain were investigated, and discussed on the continuous changes of the vegetational structures and species compositions according to the elevational changes. The vegetation of Mt.Dukyoo was changed continuously along with elevational increase. Below of 1,100m of the sea level was dominated by Quercus serrata and Q.mongolica and the upper parts of the level was dominated with Q.mongolica almost absolutely. The top part of the mountain was covered with dwarfed Q.mongolica, Betula platyphylla var.japonica and Taxus cuspidata. These continuous changes of vegetation coincide with vertical distribution of Kira's Warmth Index and didn't affected by soil factors such as soil pH, organic content and water content. In the point of view of climatic factors and species composition, the vegetation of the Mt.Dukyoo is assumed to be cool temperate broad leaved forest in lower part of the sea level 1,300m and the beginning of subalpine coniferous forest in upper of the level. On the order hand, species diversity and eyeness for each diversity index were very in all plots sampled, so that the plant communities of Mt.Dukyoo seems to be mature and very stable.

FULL SPECTRUM PRESERVING LINEAR MAPPING BETWEEN STLICTLY DENSE BANACH ALGEBRAS

Lee, Young-Whan,Park, Kyoo-Hong 西原大學校 基礎科學硏究所 1999 基礎科學硏究論叢 Vol.13 No.-

Let A and B be two strictly dense Banach Algebras on X and Y respectively where X and Y are Banach space. We give some conditions under which full spectrum preserving linear mappings from A into B are Jordan morphisms and X is homomorphic to Y.