The Computer Algebra Systems in Mathematics Education : A Review of Recent Research

Kwon, Oh-Nam,Shin, Eun-Ju,Shon, Bo-Kyung 이화여자대학교 교과교육연구소 2001 East west education Vol.18 No.-

This study examines the potential role for Computer Algebra Systems(CAS) in such an educational context, particularly their potential to get students more engaged in the learning of mathematics as well as to reduce the "strangle hold" of prerequisite algebraic skills, in courses such as functions, introductory calculus. What is the present status of and near-future outlook for computer algebra in Korean secondary schools? The answer that arises from this review of available fact is: bright with promise, but still dim. Several recent developments have set the stage for an acceleration in the dissemination rate for CAS to high schools. However, this review of some past and present conditions indicates that many years will pass before computer algebra is impacting high school mathematics as much as hand-held calculators are doing now.

기대빈도를 활용한 새로운 상대집중지수의 제안

남기성,오민홍,홍현균,Nam, Ki-Seong,Oh, Min-Hong,Hong, Hyun-Guyn 한국통계학회 2008 응용통계연구 Vol.21 No.4

본 연구는 기존의 순위만 고려하는 집중도를 보완하여 기대빈도를 이용한 새로운 상대집중지수 NOHI(Nam-Oh-Hong Index)를 제안하고, 이를 지역별 직업별 종사자 수에 적용함으로써 지역별 특화 직종 분포에 활용하는데 있다. 지역 간 특화정도를 보여주기 위해 개발된 입지계수(LQ)의 경우, 해당산업의 지역 내 비중을 상대적으로 고려하지 못함에 따라 지역 내 특성화를 반영하지 못하는 한계를 내포하고 있다. 본 연구에서 제안하는 NOHI는 이러한 단점을 보완하여 산업 및 직종의 지역간 지역내 특화도를 동시에 나타낼 수 있다. 본 연구에서 제안하는 NOHI를 활용하여 분석한 결과 서울은 경영 회계 사무관련직의 특화도가 높은 것으로 나타났으며, 부산은 기계 재료관련직의 특화도가 높은 것으로 나타났다. The purpose of this study is to introduce a relative specialization index, the Nam-Oh-Hong Index(NOHI) and to investigate regional distribution of occupational specialization using the newly developed index. Compared with Location Quotient(LQ), the advantages of the index is that the NOHI enables comparison between inter-regional and intra-regional concentration of employment possible at the same time. The results of the specialization analyses show that Seoul is specialized in management, book-keeping and office related occupations, whereas Busan in machine and material related occupations.

방사선치료를 받은 후두암 환자의 특성 및 치료 결과

오윤경,장지영,도남용 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.1

Pmpose: To present the characteristics and treatment outcome of laryngeal cancer patients who were treated by radiation therapy with or without surgery and chemotherapy. Materials and Melhods: A total of 23 patients with laryngeal cancer treated from 1998 through 2003 were available for analysis. The primary site of the cancer was the glottis in 12 patients, the supraglottis in 10 patients, and the subglottis in 1 patient. The stages were Ⅰ in 7 patients (30%), Ⅱ in 5(22%), Ⅲ in 3(13%), IV in 6(26%), and recurrent in 2(9%). The minimum follow-up period in surviving patients is 3 years after the radiation therapy. They were treated by radiation therapy at least 44 Gy with or without surgery and chemotherapy. Results: The overall survival at 1, 2, 3, 5 years in total patients were 95.6%, 82.6%, 78.2%, 73.9%. The overall survival at 1, 2, 3, 5 years in the glottic cancer patients were 100%, 100%, 91.6%, 91.6%. The overall survival at 1, 2, 3, 5 years in the supraglottic cancer patients were 90%, 70%, 70%, 60%. The 3-year overall survival showed the significant difference according to the primary site (glottic vs. supraglottic), cervical lymph node status (negative vs. positive), and overall time of radiation therapy (<50 days vs. 50-59 days vs. ≥60 days), Conclusion: The overall survival rate of laryngeal cancer patients in this analysis seems to be similar in early glottic cancers and relatively good in supraglottic cancers as compared with the results of other studies even though the total number of patients is small.

한국 친환경농업의 특성 : Friendly Agriculture in Korea

오남현 경북대학교 사회과학대학 지리학과 2003 地理學論究 Vol.- No.23

본 연구의 목적은 한국 친환경농업의 특성을 알아본 후 문제점을 살펴보고 이에 따른 대책을 제시하는 것이다. 한국 친환경농업은 1990년 중반부터 각종 법률을 제정하고 이를 실천하기 위한 계획을 수립되었고 그 기반은 매우 열악하고, 친환경 농산물의 생산·유통과 관련하여 소비자들은 농산물의 안전에 대한 강한 욕구를 가지고 있다. 한국의 친환경농업의 문제점으로는 친환경농업을 추진하기 위해 법정비와 계획은 매우 중요한 사항인데도 불구하고 이를 실천하지 않고 있다. 현재 우리농업은 과다한 비료와 농약살포로 토양은 산성화되어 있고 생산물에 대한 농약잔류에 대한 시비 등으로 친환경농업의 추진에 장해요인이 되고 있다. 또 폐영농 자재에 있어서는 수거률이 매우 낮다. 농업용수의 경우, 대부분 오염되어 있다. 축산분뇨의 경우, 배출량이나 처리에 있어서 상당한 진척이 되어 있지만 여전히 그 비율은 높다. 마지막으로, 친환경농산물의 수요가 크게 증가하고 있지만 채소나 과수 등 일부 품목이나 저 농약사용에 집중되어 있어 초보적인 수준에 머물고 있다. 이상의 문제점을 개선하고 위해서는 첫째, 친환경 농업을 확산시키기 위한 지도자 육성이 요구된다. 둘째, 소비자가 신뢰할 수 있는 친환경농산물을 생산하도록 맑은 물, 토양의 생명력을 강화해 나가야 한다. 마지막으로, 친환경농산물의 유통활성화를 위한 정부, 농협, 농민, 소비자의 노력이 절실히 요구된다. The purpose of this paper is to suggest improvement measure of the environmental-friendly agriculture in korea. The level of the environmental-friendly agriculture is considerably progressed in USA, EU. However the infrastructure of the environmental-friendly agriculture in korea is low-leveled. The findings are summarized as follows. Firstly, the policies of the environmental-friendly agriculture are not supported by producers(farmers). Secondly, the business of the environmental-friendly agriculture are threaten by extra use of chemical fertilizer and agricultural chemical(medicine), farming matter waste, farming water pollution. Thirdly, the producing articles by environmental-friendly agriculture are used by low agricultural chemicals. The policies for the environmental-friendly agricultural management are suggested in the followings. First, the policies of the environmental-friendly agricultural management do need to efforts for dissemination. Second, the programs of a manure use, agricultural chemical use control shall required. Third, the order of sound agricultural[farm] product market is important

청계만 해역에서의 부유사 농도 관측

오남선 목포해양대학교 2006 論文集 Vol.14 No.-

이 연구에서는 부유사 관측기인 ASM-IV(Argus Surface Meter)의 최대와 최소 측정가능 농도를 결정하기 위한 검정을 실시하였다. 이를 바탕으로 청계만의 갯벌에서 발생하는 부유사농도의 시간적, 공간적 변화를 측정하였다. 그 결과 평균 부유사농도는 창조시보다 낙조시에 큰 것으로 나타났다. 창조 및 고조 정조시 농도 변화는 주로 하상으로부터 10cm이내에서 나타나며, 낙조시 20cm 정도까지 농도변화 폭이 증가하였다. 농도변화가 큰 하상을 제외하면, 전체 층에서의 농도는 약 50 mg/Ɩ 이내로 큰 변화가 없는 것으로 나타났다. 관측에 따른 약간의 오차가 있었으나 전반적으로 ASM-IV를 이용한 농도관측은 만족한 것으로 나타났다. This study performs calibration of the ASM-IV(Argus Surface Meter) to set the maximum and minimum response ranges(i.e. the maximum and minimum concentrations) of the sensors. Then we measured the spatial and temporal change in suspended sediment concentration on tidal flat at Chungkye-Bay. The result showed that average of suspended sediment concentrations is higher during the ebb period than the flood period. For the flood and slack water period, distribution of suspended sediment concentrations is within 10cm above the bottom and it was extended to 20cm for the ebb period. Excluding near the bottom, suspended sediment concentrations are less than 50mg/Ɩ in total layer. In spite of some errors due to extraneous matters, the results of spatial and temporal distributions obtained by the ASM-IV are satisfactory.

국내 식물자원 추출물에 대한 항산화 활성 검색

오성준,백남인,김해영 경희대학교 생명자원과학연구원 1999 硏究論文集 Vol.20 No.-

We investigated the antioxidative activity to obtain novel antioxidants from plant resources in Korea. Three hundreds species of plants were collected and screened with DPPH (1.1-diphenyl-2-picryl hydrazyl) radical test. From this work. 10 species of plants showed a significant antioxidative activity.

목포해역에서의 파랑전파

오남선 木浦海洋大學校 2005 論文集 Vol.13 No.-

목포해역은 많은 섬과 반도에 둘러싸여 큰 파랑이 발생하지 않는다. 그러나 작은 규모의 파랑도 다른 원인에 의한 해수면 상승과 중첩되어 침수의 피해 및 규모를 가중시키는 원인이 될 수 있다. 따라서 목포해역에 대하여 파랑변형 수치모의를 실하여 목포해역에서의 파고를 산정하고자 하였다. 재현기간 50년 빈도의 파랑에 대하여 입사파향 SW, WSW, W, WNW, NW에서의 파랑변형을 모의하였다. There are a lot islands and peninsulas in Mokpo area and a large scale wave is not occur. However small wave can aggravate a inundation damage with other effect. A wave propagation was simulated and wave height was calculated from Mokpo area. A wave propagation was simulated to the case of SW, WSW, W, WNW, NW angle attack, respectively.

교통 안전운전 정보제공 웹사이트의 전자상거래 활성화 연구

오경영,김남호 호남대학교 대학원 2004 호남대학교 대학원 논문집 Vol.4 No.-

This study discussed the chances of success of e-business for the information provider supplying the traffic information on the Web for safe driving. About 70 companies are doing their business as a traffic information provider on the Internet. An attempt was made to grasp an understanding of these companies' business conducted on the Internet, and some typical Web sites run by these companies were then chosen for the study of the advanced form of e-business through an analysis of the user's purposes of accessing such Web sites as well as the factors influencing their success. There are various activities aimed for preventing a traffic accident, which are being carried out online and offline. Among them those traffic information providers on the Internet experience difficulty in charging the user for the information they provide and establishing an e-business transactions, as people tend to believe that information on the Internet is to be given free and that plenty of 'alternative' are available on the Web. However, it is suggested in this study that information providers can be successful, under the circumstances in which an increasing number of netizens begin to consent to the use of information available on payment, by providing the user with high quality content and custom-designed information for an individual user, while establishing an syndicate of the information providers.

원심분리력에 의한 l00nm이상 거대 나노 입자 제거 기술

오동훈,김남수 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-

Nano sized particles have been paid attention in various applications due to their physical and chemical properties such as surface area and reactivity In this study, synthesis of Nano particles using Poly-vinyl pyrrolidone(PVP) as a reducing agent. PVP has many advantages, because PVP is soluble in water, solvent and Surfactant. For separation of each sized particles, centrifuge is desperate needed. The main factors rotatory power in rpm. As changing the factors and checking the particles sizes, find the best condition of each sized particles. Though the mechanical process, it is possible to obtain pure and each sized Nano particles.

연령에 따른 흰쥐 망막 속얼기층의 미세구조 변화

오원영,고정식,양남길,안의태,박경호 순천향의학연구소 1995 Journal of Soonchunhyang Medical Science Vol.1 No.2

이 실험은 연령에 따른 흰쥐 망막 속얼기층의 미세구조적 변화를 관찰하기 위하여 시행하였다. 실험동물로는 생후 3개월(어린 흰쥐), 12개월(젊은 흰쥐) 및 30개월(늙은 흰쥐)된 Fisher계통 344흰쥐를 사용하였다. 각 동물은 4% chloral hydrate로 마취한 후 2.5% glutaradehyde-1.5% paraformaldehyde로 관류 고정한 다음, 안구를 적출하여 톱니둘레를 다라 절단한 후 시신경원반외측의 일정부위에서 망막조직을 떼어내었다. 떼어낸 조직은 2.5% glutaradehyde- 1.5% paraformaldehyde 고정액에 다시 고정한 후, 1% osmium tetroxide액에 또 다시 고정하였다. 고정된 조직은 ethyl alcohol과 acetone으로 탈수한 후 araldite혼합액에 포매하였다. 포매된 조직은 LKB-V ultratome으로 얇은 절편을 작성하여 uranyl acetate와 lead citrate로 염색한 후 JEM 100CX-Ⅱ 전자현미경으로 관찰하여 다음과 같은 결론을 얻었다. 1. 무축삭신경원의 세포질돌기는 세포질의 전자밀도, 연접소포의 종류 및 양에 따라 4종류 구분되었다. 2. 속얼기층에서 관찰되는 신경연접의 형태는 연접리본복합체외에 4종류의 일반신경연접을 관찰할 수 있었으나, 연령증가에 따른 연접형태의 미세구조적 변화는 관찰할 수 없었다. 3. 연령이 증가함에 따라 부챗살아교세포의 상대적 영역이 넓어졌다. 4. 연령이 증가함에 따라 무착삭신경원과 신경절세포의 가지돌기안에 수초구조, 용해소체, 잔여소체가 자주 관찰되었다. 이상의 결과를 종합해 보면 흰쥐의 망막속얼기층은 연령이 증가하면 무축삭신경원과 신경절세포는 기능이 점점 약해지므로 부챗살아교세포의 영역이 상대적으로 더 넓어진다고 생각된다. Morphological differences among the inner plexiform layers at different age groups have been studied in young(three months old), adult(twelve months old) and old(thirty months old) Fisher stain 344 rats. Under anethesia, 2.5% glutaraldehyde- 1.5% paraformaldehyde solution was perfused through the heart. Pieces of the tissue taken from the posterior region of the retina were fixed in 2.5% glutaraldehyde- 1.5% paraformaldehyde, and in 1% osmium tetroxide followed by fixation embedded in aralditse mixture. Ultrathin seciton were statined with uranyl acetate and lead citrate solution and were observed with JEM 100CX-II electron microscope. The results were as follows: 1. Four types of amacrine cells were found according to their electron densities, and kind and amount of the synaptic vesicles, were found, i.e., dark amacrine cell with clear vesicles(Al cell), light amacrine cell with clear vesicles(A2 cell), dark amacrine cell with clear and granular vesicles(A3 cell) and light amacrine cell with clear and granular vesicles(A4 cell) 2. In the inner plexiform layer, there appear two types of synapses : 1) synaptic ribbon complex and 2) conventional synapses. Conventional ones exhibited four different types, showing, i.e., prominent presynaptic density(type 1), prominent postsnaptic density(type 2), prominent pre-and postsynaptic densities(type 3), and lesser prominent pre-and postsynaptic densites. 3. Territories of the Muller cells were expanded during aging. 4. Myelin figures, lysosomes, lipofuscin granules and lipid droplets were frequently observed in the amacrine and ganglion cells of the adult and old rats. From the above results, it was suggested that functions of the bipolar, amacrine and ganglion cells were diminished gradually, whereas territories of the Muller cells were expanded during aging.