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서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1997)
김재홍,문득곤,김정수,김용준,임동진,박상훈,김희성,이민수,송기훈,김갑형,김형석,성소영,이인섭,김석우,황지환,조창근,김경문,부태성 대한화학요법학회 2000 대한화학요법학회지 Vol.18 No.3
Background : In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. Objective & Methods : For the detection of a more effective therapeutic regimen and assessing the prevalence of PPNG, we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results : In 1997. 99 strains of N. gonorrhoeae were isolated, among which 45(45.5%) were PPNG. Conclusion : The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 45.5% in 1997.
김정태,황현식 전남대학교 치과대학 2000 전남치대논문집 Vol.12 No.1
The purpose of this study was to evaluate the changes of occlusal contact in the first year following orthodontic tooth movement, and further find out the time of occlusal stabilization after orthodontic appliance removal. The sample consisted of twenty orthodontic patients who had been treated with edgewise appliances. Occlusal contacts in maximum intercuspation were recorded using silicone-based impression material at the time of the removal of orthodontic appliance and 1, 2, 3, 4, 5, 6, 9, and 12 months after the appliance removal. After all the occlusal contacts were evaluated and classified as either true or near contacts, the numbers of each contact were recorded. Each interocclusal record was then transferred to the study model, and the changes in the location of the occlusal contact were compared and analyzed. Through the statistical analyses, the following results were obtained. 1. The number of occlusal contacts showed an increasing pattern with a linear trend during the period of this study. 2. The number of occlusal contacts showed the most steep increasing pattern for one month after appliance removal. 3. There was no significant increase in the number of occlusal contacts after 6 months following orthodontic tooth movement. 4. When it was compared with changes in location of occlusal contact, the number of contacts which migrated toward central fossa was greater than that of contacts which migrated away from central fossa till 6 months after appliance removal. The above results suggest that occlusal stabilization following orthodontic tooth movement mostly occurs within the 6 months after appliance removal and mechanical retention is required during this period.
김태완,최종수,최종환,김현주 忠北大學校 平生體育硏究所 1997 平生體育硏究所 論文集 Vol.9 No.-
, The relationship between physical activity and cognitive performance was studied in the elderly women. Fifty volunteers (60-74 yrs) agreed to participate and were placed in 2 groups; exercise group(n=25; 68.72±4.22 yrs) and Non-exercise group(n=25; 69.52±5.1 yrs). The subjects who joined in the exercise group were asked to participate in exercise program(3 times/week, 80 min/day) for 12 weeks. The subjects n both groups were tested on the cognitive psychomotor performance (finger simple reaction time(SRT) and choice reaction time(CRT), tapping, and eye-hand coordination) at the beginning and the end of the 12-weeks program. For data analysis, mean and standard deviation scores were calculated, and ANOVAs and MANOVAs were used. There was an interaction between Group(2 exercise and non-exercise groups) and Time (pre- and post-tests) on all cognitive psychomotor performance tasks. Especially, each group was significantly interacted with Times on the performance of eye-hand coordination. After the exercise program, the exercise group was significantly better than the inactive group on all dependent variables (SRT and CRT, number of tappings, and performance scores of eye-hand coordination).
알루미늄과 헤테로폴리산으로 개질된 메조포러스 실리카 상에서의 AKD 합성
김현국,우창수,최재석,박민태,이병민,이호인 한국공업화학회 2003 응용화학 Vol.7 No.1
AKD(alkyl ketene dimer) used widely as a neutral sizing agent is produced industrially by halogenization of stearic acid followed by dimerization of alkyl ketene. In the present work, to suppress the byproduct of hydrochloric acid and to improve reaction pathway. AKD was prepared through of ketene intermediate by dehydration of stearic acid in gas phase using reaction with silanol on silica as active sites of the catalyst SBA-15 showed the highest activity due to the large and open tubular pores. It was found that main products were dimer and trimer. Our goal of the present work was to increase of the selectivity for the dimer.
급속응고된 N-type Bi₂Te_(2.75)Se_(0.15) 열전재료의 미세조직과 열전특성에 미치는 압출비의 영향
김태경,이상일,임종호,손현택,김택수,천병선 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.1
The n-Type thermoelectric compounds of Bi₂Te_(2.75)Se_(0.15) doped with 0.1 wt% SbI₃ were fabricated by gas atomization process and extruded under ratio of 16:1 and 28:1 at 450℃. The effect of extrusion ratio on the microstructures and thermoelectric properties were investigated by a combination of microscopy, XRD and thermoelectric properties. Grains of extruded bars are smaller than those of heated powder at extrusion temperature (450℃) due to the dynamic recrystallization but with increasing the amount of plastic deformation, grains of specimen extruded with 28:1 were slightly coarse. The compressive strength of hot extruded bar under 28:1 is 160 MPa and with decreasing the extrusion ratio to 16:1, the value is 250 MPa. The Seebeck coefficient a and electrical resistivity p were decreased with increasing ratio, while thermal conductivity x was increased. this results from decrease of carrier scattering and increase of carrier mobility. Extruded bar under ratio of 16:1 shows the higher value of figure of merit (Z=2.50x10^(-3)/K) than that of 28:1 (Z=2.07x10^(-3)/K). (Received June 24, 2004)
Productivity S/W 학습용 웹 코스웨어에서 상황맥락적 오류교정 패드백이 학업성취도에 미치는 영향
김도윤,배영권,백장현,이태욱 한국컴퓨터교육학회 2004 컴퓨터교육학회 논문지 Vol.7 No.1
현재 웹 코스웨어에서의 형성평가와 이에 대한 피드백 시스템은 많이 구축되어 있다. 그러나 대부분 웹 코스웨어의 형성평가와 사용자 반응에 따라 제공되는 피드백은 실제의 문제 상황과 거리가 먼 상태에서 단순한 텍스트 형태로 정오의 표시, 정답 표시, 관련 정보의 표시 등을 제공하고 있다. 이는 자칫 피드백의 교정적 기능을 약화시켜 학습자의 학습 내용에 대한 이해와 학습 전이의 가능성을 감소시킬 수 있다. 또한 구성주의 학습이론에 따르면 학습은 그 것이 발생하는 상황에 영향을 받고 지식이 어떤 맥락에서 학습했느냐에 따라 다르게 학습되며 전이된다고 한다. 이런 배경에서 본 연구는 웹 코스웨어에서 형성평가를 실시할 때 학습자의 반응에 따라 피드백을 문제 상황과 밀접하고 유사하게 상황맥락적으로 제시할 수 있는 상황맥락적 오류고정 피드백시스템을 설계하고 구현하였다. 그리고 실제 Productivity S/W를 학습할 수 있는 웹 코스웨어에 ‘정오/정답제공형 피드백', ‘관련정보제공형 피드백’‘상황맥락적 오류교정 피드백’을 적용한 후 ‘상황맥락적 오류교정 피드백’이 학업 성취에 있어서 다른 두 가지 유형의 피드백보다 더 효과적인지를 검증하였다. Today there are many Web courseware systems for formative evaluation and feedback. Formative evaluation and feedback provided according to users’ response in most Web courseware systems, however, are simple texts showing only whether correct or wrong, correct answers, relevant information, etc., far deviated from actual context. Thus such a system may weaken the corrective function of feedback and, as a result, reduce learners’ understanding of contents and the possibility of leaming transfer. In addition, according to the learning theory of constructivism, learning is influenced by the situation, in which it happens, and knowledge is learned and transferred differently depending on the context in which it is learned. In the background, this study designed and implemented a contextual error-correction feedback system that can provide feedback in a context closely related and similar to the relevant situation according to the response of learners when formative evaluation is carried out in Web courseware. In addition, it applied ‘correction/correct-answer-providing feedback’, ‘relevant information providing feedback’ and ‘contextual error-correction feedback’ to Web courseware for learning actual productivity S/W and verified if ‘contextual error-correction feedback’ is more effective than other two types of feedback for learners’ academic achievement.