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.

Alkylhalide가 Mouse의 LDH isozyme 분포에 미치는 영향 : Cellulose Acetate Electrophoresis Method

권미경,김영옥,박은주,이동화,이명미,이문희,이양자 曉星女子大學校 藥學大學 學生會 1988 曉星藥誌 Vol.4 No.-

The effect of Carbontetrachloride administration on Lactatedehydrogenase isozyme patterns were analyzed by cellulose acetate electrophoresis for the brain, heart, kidney, lung, liver and mouse muscle. Each other tissue was found to have a characteristic distribution of these isozymes. At normal condition, aerobic tissue such as brain, heart, kidney, and lung were found to have all five isozymes from LDH_1 to LDH_5, while anaerobic tissues such as liver and muscle were found to have superiorly LDH_5 The toxicity of Carbontetrachloride administration was most prominence in the liver, and lung toxicity was occured also.

간호중재분류체계(NIC)를 이용한 중환자실 간호중재 분석

권경남,장희정,황운순,김은주,이미경 영남이공대학 산업기술연구소 2000 産業技術硏究 Vol.12 No.-

The purpose of this research was to identify nursing interventions performed by the ICU nurses from 2 university hospital in Taegu. For this research, I used the Nursing Intervention questionnaire developed by the Iowa Intervention Project and translated by korean specialists and professor concerned to the same field. In order to obtain the data, a special group of professor, head nurse, charge nurse, researcher was instituted. The special group work validataed 205 nursing interventions with agreement of more than 50% becuse the NIC(433 nursing intervention) survey process was too time-consuming and not appropriate for all labels. The data were collected from June 1 to 30, 1999 and analysed with SAS program. The obtained results are as follows; (1) 94 interventions were performed at least daily. (2) The most frequently used nursing interventions were Parenteral Medication Administration, Aspiration Precautions, Pressure Ulcer Prevents, Positioning, Airway Management, Cough Enhancement in rank. In conclusion, this research using NIC has helped to figure out the component to the ICU care in korea. The use of this results will contribute to enhance quality assessment and improve standard of ICU nursing.

감염근관에서 Black-Pigmented Bacteria의 동정에 대한 연구

권은경,김은숙,곽주석,이황,이수종,임미경 大韓齒科保存學會 2002 Restorative Dentistry & Endodontics Vol.27 No.1

Black-pigmented bacteria have been implicated in the endodontic infections. This group of microorganisms includes Porphyromonass endodontalis, Porphyromonas gingicalis, Prevotella intermedia, and Prevotella nigresceus. The organisms display a wide variety of virulence factors that may be pertinent to acute endodontic infections. The aim of this study was to identify P.endodontalis, P.gingivalis, P.intermedia, and P.nigrescens by using special potency disk test, filter paper spot test, 16S rRNA gene-directed PCR, and API 32A. Microbial samples were collected from root canals of 33 intact teeth with necrotic pulp and/or apical periodontitis. Conventional laboratory methods were used for identification of the strains of black pigmented bacteria. Eighteen of 33 samples were positive for the growth of black-pigmented bacteria. Five colonies were cultured from each pure cultured colonies from Brucella agar plate. Seventy seven colonies were positive for the growth of black-pigmented bacteria. Thirty three of 77(42.6%) were identifed as P.nigrescens, 10 of 77(12.9%) were P.gingivalis, 6 of 77(7.8%) were P.endodontalis, 10 of 77(12.9%) were P.intermedia. On the contraty the reference strains of P.nigrescens, experimental strains of P.nigrescens was sensitive to kanamycin in special potency disk test. 16S rRNA gene PCR and API test after rapid presumptative identification methods. such as special potency disk test and filter paper spot test, would be accurate detection methods for black-pigmented bacteria.

유아를 위한 절제·절약 프로그램의 적용사례 연구

권미량,김은주 부산대학교 영유아보육연구소 2002 영유아보육연구 Vol.8 No.-

This program developed, implemented, and evaluated "moderation and saving activities" for early childhood facilities. This program had conducted in children who from 3 to 5 years old in H child care center, from March, 2001 to February, 2002. This program was implemented with daily activities and education activities. daily activities consist of the following ; using furniture longer, saving education material, saving clothes in daily life, saving food, managing garage market. education activities consist of following ; role play, children's story, children's story play, shop play, mathematics activities, cooking activity, language activity, project activity, trip activity. This program was evaluated positively by the children, teachers, and parents. The children had formed saving habit and gotten sharing life style. They could have thoughts of rotation and sharing. The teacher could get the idea of economy with sharing and reusing and the idea of education thinking material and life. The parents could lower desire for purchasing and form economic family life style. Through this program, there were chances of interactions between parents and children, parents and teachers and gave effect of increasing communication with a community.

4종의 식품 부패 미생물에 대한 국내산 자생 식물 열매 추출물의 항균성 탐색

권민경,이해은,박주연,한영숙 동아시아식생활학회 2003 동아시아식생활학회지 Vol.13 No.5

To select new useful domestic plants with antimicrobial activities, thirty five samples of berry plant were distributed from Plant Diversity Research Center in Korea Research Institute of Bioscience and Biotechnolog. Their extracts with methanol were tested against Escherichia coli, Salmonella typhimurium, Staphylococcus aureus, Listeria monocytogenes by paper disc method. The methanol extracts from Viburnum dilatatum, Viburnum erosum, Aralia continentalis, Camellia japonica, Acer trumcatam, Arasaema takesimense and Rhysocarpus intermedius were effective against S. aureus and the results were as follows: Viburnum erosum 6.5 ㎜, Viburnum dilatatum and Aralia continentalis 7.0 ㎜, Rhysocarpus intermedius 8.0 ㎜, Acer to mcatum 9.0 ㎜, Camellia japonica and Arisaema takesimense 9.5 ㎜ And only the methanol extract from Camellia japonica was effective against L. monocytogenes, 7.0 ㎜. Antimicrobial activities of E. coli and S. typhymurium were not detected. The minimum inhibitory concentration(NIC) of berry of Camellia japonica was examined as 1,250 ㎍/mL against S. aureus and as 1,250 ~ 2,500 ㎍/mL against L. monocytogenes.

운동부하테스트에 따른 정상혈압자의 혈압상승도가 고혈압 발병요인에 미치는 영향

권은영,김정주,고인태 경희대학교 체육대학 한국체육과학연구소 2003 體育學論文集 Vol.31 No.-

It is well established that the elevation of systolic blood pressure during exercise is the risk factor for cardiovascular diseases. The objective of this study is to examine whether the elevation of systolic blood pressure during exercise is correlated with the pathogenesis of hypotension To fulfill this objective, this study assigned 31(46.2±7.0 yr) middle-aged women to low group(n=17) and high group(n=14) according to the criteria for the classification of hypertension(JNC-VI, 1997). Following this, this study analyzed cardiovascular factors(SBP, DBP, HR, VO₂, RER) and blood components(LDLC, HDLC, TC, TG, HDLC/LDLC). The results of the present study were as follows: (1) SBP was significantly increased at resting state, at 4 minutes, at 6 minutes and at endpoint(P<.05), (2) There was significant difference between SBPmax and SBPrest(P<.05), (3) DBP was significantly increased solely at resting state SBPmax (P<.05), (4) RER was significantly increased at 10 minutes. In addition, a statistical analysis revealed that SBPmax-SBPrest was significantly correlated with age(r=0.336), SBPmax(r=0.827) and DBPmax(r=0.335). In conclusion this study indicates that the monitoring of such cardiovascular indicators as SBP, DBP, HR, VO₂ and RER is essential in health promotion in patients with obesity or normal healthy people as weil as patients with hypertension.

方向분산성이 고려된 海浜流 流動特性에 관한 연구

최은주,유수진,권정곤 부산대학교 환경문제연구소 1994 環境硏究報 Vol.12 No.-

This study was managed to develope the existing numerical calculation model of near shore current and wave fields where wave and current coexist around shallow water region, and analyse their problems. Until now, nearshore current model that include longshore current and on-off shore current had shown wave characteristic based on regular wave theory. In this study, however, nearshore current characteristic was changed by directional dispersion. So the effect of directional dispersion of multidirectional irregular wave was examined numerically by the basic study of nearshore current calculation due to multidirectional wave that was driving force of pollutant material at shallow water region.

상악제1소구치에서 전부도재관의 finish line형태에 따른 파절강도와 웅력 분포에 관한 연구

이상권,박은주,이진한,정영찬,동진근 원광대학교 치의학연구소 2003 圓光齒醫學 Vol.12 No.2

The purpose of this study was to compare the fracture resistance of the IPS Empress ceramic crown with 1.0mm width rounded shoulder, which is usually recommended in all ceramic crown, and 0.5mm width chamfer finish lines on the maxillary first premolar. 30 sound maxillary first premolars were selected and then storaged in 5% NaOCl and saline. 15 teeth were performed preparation for each group(1.0mm rounded shoulder, 0.5mm chamfer). After 30 stone dies were made for each group, the IPS Empress ceramic crowns were fabricated and cemented with resin cement(Bistite resin cement, Tokuyama Soda Co. LTD., Japan) on the natural teeth. The cemented crowns were mounted on the positioning jig and the universal testing machine(Zwick Z020, Zwick Co., Germany)was used to measure the fracture strength, with stress loading on the occlusal surface between buccal and lingual cusp. And also, three-dimensional finite element model was used to measure the stress distribution with two types of the finish lines(1.0mm rounded shoulder, 0.5mm chamfer) and two loading conditions(both buccal and lingual cusp inclination, lingual cusp inclination only). The result of the this study were as follows. 1. In the fracture resistance experiment according to the finish line, the mean fracture strength of rounded shoulder(842N) showed higher value than that of the chamfer(590N) (p<0.05). 2. In the three dimensional finite element analysis of all ceramic crown, metal die and natural teeth model did not show any differences in stress distribution between finish lines. 3. Generally, when force was loaded on the occlusal inclination of buccal and lingual cusp, the stress was concentrated on the loading point and the central groove of occlusal surface. 4. When force was loaded only on the occlusal inclination of lingual cusp, the stress was concentrated on the lingual finish line and loading point.

고등학생의 인터넷 사용정도와 학교적응, 친구관계에 대한 연구

이현주,김미연,이희재,권소영,김민정,김민주,방은혜,이경희,김수지,이자형 이화여자대학교 간호과학대학 2004 이화간호학회지 Vol.- No.38

Today, almost all families are quipped with computers. At the same time, we can find lots of side-effects because of computers. If young students, who tend to be unable to control their impulses once they are immersed in internet, the problem will be more serious. It could be happened that the young students can't distinguish the real from the image. Therefore, it is important to grasp the actual condition of juvenile Internet addicts and their practical life, and to come up with basic materials necessary for working out countermeasures. This study surveyed 339 high school students from three high schools in the area of Seoul. Data collection were collected from 22nd of December, 2003 to 27th of December 2003. The collected data were analyzed by SPSS program using T-test, ANAVA and Pearson correlation coefficient. The results were as follows: First, of the 333 respondents 9.61% of them were high-risk internet using group, 15.02% of them were potential-risk internet using group. 25% of then were identified as addicted group. Second, the more addicted the subjects are, the lower their level of school adjustment becomes. For the addicted group, it is difficult to adjust their school and to have a good relationship with friend. Third, the more addicted the subjects are, the lower their level of friendship becomes. The subordinate areas of friendship have same results as the level of Internet addiction and the extent of friendship. If students are addicted to Internet, it is difficult to find friends who can give them encouragement in practical life. Firth, there was a negative relationship between Internet addiction and school adjustment, and, there was a negative relationship between Internet addiction and friendship. Through this study we have seized the relationship between Internet addiction and school adjustment and friendship. As a result, the more addicted, the more difficult to adjust to school. And for the students who were addicted, it is difficult to make a friend.