21세기의 국제 경쟁력 강화를 위한 교과 교육의 과제

이종희,김현자,전숙자,최연희,허명 이화여자대학교 교육대학원 1996 교과교육연구 Vol.5 No.-

The purpose of this study is to provide suggestions for the innovation of Korean secondary education. The suggestions were dervied from in - depth study regarding various subjects taught in secondary school, such as Korean language, Mathematics, English, Social Studies and Science. Five kinds of questionnaires were developed and answered by a total of 728 secondary teachers. The teachers were selected nation-wide by stratified cluster sampling method. Major results of this study are as follows : A student-centered teaching model of Korean language focusing on the improvement of creative and critical thinking was developed. Examples of effective teaching method for developing mathematical literacy were presented. Some suggestions for improving English education were proposed ; The curriculum should be established by both the top- down process from the educational administers and the curriculum developers, and the bottom-up process from the teachers : furthermore, the teachers should be allowed to adapt it for their own classes. Each school should be able to choose class- types; for example, small classes with less than 25 students, large classes with around 50 students, class placement by the students' proficiency, or team teaching. Multimedia English classrooms will be needed for more effective whole-class activities, group work, and individual work to overcome the problems with too many students in a class or with students with various proficiency in a class. The testing system should be changed completely, The entrance examinations for higher- level schools or nation-wide written tests should be abolished. Then, each city or district should have a center for testing and developing teaching aids to help teachers by providing listening test items and teaching aids, and administering direct testing for speaking or writing. Teacher qualifying examinations and reeducation programs for teachers should be changed to have better-qualified English teachers for the 21st C. A curricular and instructional model emphasizing the improvement of students' ability to dealing with various social problems was proposed. 5) Various problems and issues in current science education were identified, and detailed suggestions to solve the problems and issues were proposed, which include entrance examinations, teacher education, curriculum development, gifted-student education and educational environment.

SM45C鋼 熔接部의 殘留應力에 依한 疲勞破壞擧動

李龍福,金鍾鉉,金相準 弘益大學校 1987 弘大論叢 Vol.19 No.2

Fatigue fracture behaviors of submerged arc welded SM45C steel were investigated when a crack propagated from tensile residual stress region. The experimental values were compared with the values expected by the Forman equation. The results are summarized as follows: 1. When the fatigue crack was propagated the experimental values were found to corresponded to the values predicted by Formane quation. 2. The experimental values in weld metals have a little difference to the values expected by Forman equation. It was assumed that residual stresses were relaxed by repeated tensile loading. 3. The higher stress ratios were, the larger the difference of fatigue crack growth rate always were in the Same stress intensity factor range for each stress ratios. Particularly, these differences of fatigue crack growth rates were smaller in weld metal than in base metal. It agrees with the fact of that the difference of .effective stress ratios for each stress ratios is small.

All-in-one 접착제에서 초음파진동이 법랑질과 상아질의 결합강도와 레진침투에 미치는 영향

이범의,장기택,이상훈,김종철,한세현 大韓小兒齒科學會 2004 大韓小兒齒科學會誌 Vol.31 No.1

초기의 접착 시스템은 여러 단계의 술식을 필요로 하였으며 술자의 기술과 재료의 성질에 크게 좌우되었으나 최근 산부식, priming, adhesive를 한번에 적용할 수 있는 a11-in-one adhesive system이 등장하였다. 치과에서의 vibration의 이용은 치석의 제거 및 접착제의 점도를 낮추는데 이용되어왔으며 vibration은 접착제의 흐름성을 향상시켜 film thickness를 낮추어 수복물 주위의 미세누출을 줄이는데 도움을 준다. 이에 저자들은 all-in-one adhesive system에서 vibration이 법랑질과 상아질의 접착강도와 레진침투에 미치는 효과를 알아보고자 하였다. 법랑질 시편은 발거 후 실온에서 0.1% thymol 용액에서 보관된 30개의 건전한 사람의 대구치를 무작위로 10개씩 세군으로 나누고 근원심 방향으로 두 부분으로 분리하여 각각은 같은 접착제를 사용하고 초음파진동여부를 다르게 하였고, 아크릴 레진을 이용하여 직경 1-inch의 PVC관에 매몰한 후 협설면이 아크릴봉과 동일한 높이가 되도록 220-, 600-grit 연마지로 순차적으로 연마하였고 군당 10개씩 여섯 군으로 분류하였다. 1군과 2군은 Prompt L-Pop(3M-ESPE, Seefeld, Germany), 3군과 4군은 One-Up Bond F(Tokuyama Corp., Tokyo, Japan). 5군과 6군은 AQ bond(Sun Medical Co., Kyoto, Japan)를 제조사의 지시에 따라 도포하였다. 2군, 4군, 6군은 초음파 치석제거기를 이용하여 치면에 대고 15초간 진동을 가한 후 광중합하였다. 상아질 시편은 치관부 법랑질을 제거한 후 상아질면을 아크릴 봉과 동일한 높이가 되도록 하고 법랑질 시편과 동일하게 처리하였다. 이후 직경 2mm, 높이 3mm의 Teflon mold(Ultradent, U.S.A.)를 이용하여 복합레진을 충전한 후 40초씩 두 번에 나누어 광중합한 후 24시간동안 실온에서 증류수에 보관하였다. 열순환 시행한 후, 만능측정 기(Instron4465)로 전단결합강도를 측정하였으며 Resin tag의 양상을 비교하기 위해 각 군의 시편의 치질을 완전히 용해 시킨 후 표면을 주사전자현미경사진으로 관찰하여 다음과 같은 결과를 얻었다. 1. 법랑질에서 초음파 진동을 가한 군(2,4,6군)은 가하지 않은 군(1,3,5군)에 비해 평균 전단결합강도가 높게 나타났다. 그 차이는 AQ bond 군을 제외하고 통계적으로 유의하였다(p<0.05). 2. 상아질에서 초음파 진동을 가한 군(2,4,6군)은 가하지 않은 군(1,3,5군)에 비해 평균 전단결합강도가 높게 나타났다. 그러나 그 차이는 One-Up Bond F군을 제외하고는 통계적으로 유의한 차이가 없었다. 3. 전자 현미경 관찰에서 초음파 진동을 가한 군에서 더 많은 법랑질의 소실과 상아질에서 resin tag의 길이가 길었고 lateral branch의 수도 많이 관찰되었다. The objective of this study was to apply the vibration technique to reduce the viscosity of bonding adhesives and thereby compare the bond strength and resin penetration in enamel and dentin achieved with those gained using the conventional technique and vibration technique. For enamel specimens, thirty teeth were sectioned mesio-distally. Sectioned two parts were assigned to same adhesive system but different treatment(vibration vs non-vibration) Each specimen was embedded in 1-inch inner diameter PVC pipe with a acrylic resin. The buccal and lingual surfaces were placed so that the tooth and the embedding medium were at the same level. The samples were subsequently polished silicon carbide abrasive papers. Each adhesive system was applied according to its manufacture's instruction. Vibration groups were additionally nitrated for 15 seconds before curing. For dentin specimen, except removing the coronal part and placing occlusal surface at the mold level, the remaining procedures were same as enamel specimen. Resin composite(Z250 3M. U.S.A.) was condensed on to the prepared surface in two increments using a mold kit(Ultradent Inc., U.S.A.) Each increments was light cured for 40 seconds. After 24 hours in tap water at room temperature, the specimens were thermocycled for 1000cycles.. Shear bond strengths were measured with a universal testing machine(Instron 4465, England). To investigate infiltration patterns of adhesive materials, the surface of specimens was examined with scanning electron microscope. The results were as follows : 1. In enamel, the mean values of shear bond strengths in vibration groups(group 2,4,6) were greater than those of non-vibration group(group 1,3,5). The differences were statistically significant except AQ bond group. 2. In dentin, the mean values of shear bond strengths in vibration groups(group 2 4, 6) were greater than those of non-vibration groups(group 1,3,5). But the differences were not statistically significant except One-up Bond F group. 3. The vibration group showed more mineral loss in enamel and longer resin tag and greater number of lateral branches in dentin under SEM examination.

정상 및 Phenylhydrazine으로 처치한 토끼 적혈구의 Adenosine Deaminase Isozymes의 활성도에 관하여

李鉉國,車鍾希,李奉宰,金良均,李根培 조선의대 1984 The Medical Journal of Chosun University Vol.9 No.1

정중과잉치로 인해 회전된 상악 중절치의 치험례

이범의,김영재,김정욱,장기택,이상훈,김종철,한세현 大韓小兒齒科學會 2004 大韓小兒齒科學會誌 Vol.31 No.4

정중과잉치의 원인은 잘 알려지지는 않았지만 dental lamina의 hyperactivity에 의해 발생한다는 가설이 가장 많이 받아들여지고 있다. 이러한 정중과잉치의 병발증으로는 주변 영구절치의 맹출 장애, 만곡 치근, 치근흡수, primordial 혹은 follicular cyst의 형성, 회전, 이환된 부위의 총생 및 비정상적인 정중이개를 일으킬 수 있다. 이러한 이유로 영구전치의 회전이 야기되면 보통 공간의 부족은 적거나 없으며 재발이 흔하므로 과개선이 요구된다. 재발의 방지를 위해서는 조기치료, 과개선, 긴 보정기간, 적절한 접촉면의 형성, 짝힘의 사용, 그리고 수술적인 방법 등이 제안되어왔다. 이에 저자는 정중과잉치로 인하여 심하게 회전된 상악중절치를 주소로 내원한 환아에서 교정적, 외과적 술식을 이용하여 양호한 결과를 얻은 두 증례를 보고하는 바이다. The etiology of mesiodens is unknown but the most widely accepted theory is the hyperactivity of the dental lamina. Complications of mesiodens are delayed or prevented eruption of maxillary central incisors, displacement or rotation of permanent teeth, crowding of affected region, abnormal diastema or permanent space closure, dilaceration or abnormal root development of permanent teeth, primordial or follicular cyst formation, root resorption of adjacent teeth, eruption into nasal cavity. If mesiodens rotate the maxillary central incisors, space deficiency is not common and relapse is very common. So overcorrection is needed. To prevert the rotational relapse, early treatment, overcorrection, long retention period, properly formed proximal surface, use of coupled force, and surgical techniques have been suggested. The authors present two cases, whose chief complain were severely rotated maxillary incisors by mesiodens, treated by orthodontic and surgical technique and showed good results.

혼합형 자가면역성 용혈성 빈혈을 동반한 전신성 홍반성 루푸스 1예

이승철,김선임,이승훈,이현경,조남국,한성훈,유영진,조종래 인제대학교 2000 仁濟醫學 Vol.21 No.2

A 17-year-women developed mixed warm and cold antibody type autoimmune hemolytic anemia associated with systemic lupus erythematosus. The patients was admitted to our hospital for syncope. Jaundice was observed. Urinalysis revealed protein and hemoglobin. Her hemoglobin was 4.6g/dl and reticulocytes were 10%. Total bilirubin was elevated, while haptoglobin and complement were abnormally reduced. ANA and mitochondrial Ab were detected. The direct and indirect Coombs test were positive. The direct antiglobulin test was positive ; IgG and C3d were detected on the red cell surface. The cold agglutinin(CA) titer was 128. The patients was initially treated with high dose steroid therapy. However the patients did not responded to high dose steroid therapy. We treated the patients with plasmapheresis and synchronized cyclophosphamide therapy. Clinical remission of hematologic complications was achieved in this patients. We report a case of mixed type autoimmune hemolytic anemia with SLE that responded plasma pheresis and synchronized cyclophosphamide therapy.

대전지역 소아 야뇨증에 관한 역학 조사

이재현,하용원,임재성,윤율로,설종구 충남대학교 의과대학 지역사회의학연구소 2000 충남의대잡지 Vol.27 No.2

Purpose: Nocturnal enuresis is defined as at least one wet night per month in children older than five years of age. Despite being a common disorder in children, not many reports about prevalence of enuresis in Korea have been written. To establish the prevalence of childhood enuresis in Taejon, an epidemiologic study was performed. Materials and methods: We evaluated 1,030 preschool and elementary school children living in Taejon city. The ages were between 5 and 10 years-old and the mean age was 7.5 years-old. The percentage of boys was 52.4% and the girls' was 47.6%. The questionaires was completed by the parents. Results: The overall prevalence of enuresis in Taejon city was 7%. The prevalence of enuresis was higher in boys(54.2%) than in girls(45.8%). The prevalence of primary and secondary enuresis was 55.6% and 44.4%, respectively. The inability to wake up in order to void because of deep sleep was 29.2% and positive family history was 20.8%. On the aspect of enuretic frequency, one episode per month was most common. The cases combined with diurnal enuresis were 9.7%. Among the enuretic children, the most common traditional treatment was self-voiding by awakening during night and most favored treatment was herbal medicine. Conclusion: These data show that the prevalence of nocturnal enuresis in Taejon city is lower than in other countries. It's prevalence is related to the positive family history, guilt feeling, diurnal enuresis, and early sleeping. However, concerning the prevalence of enuresis, there is statistically significant difference only in family history.

SS41村 熔接部의 疲勞龜裂傳播에 미치는 殘留應力의 影響

李龍福,金鍾鉉,趙顯億 弘益大學校 1988 弘大論叢 Vol.20 No.2

In this study submerged arc welded the welding structural steel(SS41) was selected as an application model. On condition that stress ratios were 0.5, 0.3, 0.05, the relaxation of the residual stress was measured according to the number of repeated cycles, and the experimental values were compared with the values expected by the superposition of residual stress relaxation. The result are summarized as follows : 1. Welding residual stress is conspicuously reduced depend on the increase of repeated cycles, that is, the effect of welding residual stress on the crack propagation is gradually reduced with the increase of repeated cycles. 2. The error bet ween the experimental values and expected values which are considered only initial residual stress can be reduced by consideration of residual stress relaxation according to repeated cycles. The expected values depend on this method agree to experimental results of fatigue fracture behavior. 3. In case of welded metal, unlike base metal, rate of initial crack ropagation don't show up large difference because the difference of effective stress ratio(Reff) is decreased very much by addition to tensile residual stress.

영구치의 맹출 장애에 관한 조사 연구

이종범,장철호,김종철,한세현,이상훈 대한소아치과학회 2007 大韓小兒齒科學會誌 Vol.34 No.1

맹출 중인 치아는 오랜 기간 동안 이동하는 과정에서 주위의 여러 요인들, 즉 유치의 조기 상실, 과잉치, 국소적 병소, 혀, 입술, 저작근, 외상 등에 의해서 다양한 영향을 받을 수 있다. 이러한 여러 요인들이 작용할 경우 치아의 정상적인 맹출 과정이 방해를 받게 되어 치아의 맹출 장애를 초래할 수 있다. 본 연구에서는 서울대학교 치과병원 소아치과에 2004년 1월 2일부터 2005년 12월 31일까지 신환으로 내원한 환자들, 총 8,010명의 주소를 분석하였고, 맹출 장애를 보이는 환자는 전체의 8.79%를 보였다. 맹출 장애의 유형은 맹출 지연이나 조기 맹출, 이소 맹출로 분류할 수 있었고, 맹출 지연이 가장 많이 나타난 치아는 상악 중절치이며, 조기 맹출이 호발한 치아는 하악 유중절치이고, 이소 맹출이 가장 많이 나타난 치아는 상악 제1대구치였다. Eruption disturbance is an abnormal state of eruption that occurs over a broad chronologic age range. There are many factors that influence eruption such as premature loss of primary teeth, supernumerary tooth, local disease, tongue, lip, mastication muscle and trauma. The purpose of this study was to determine the prevalence, patterns and tooth position that have eruption disturbance in children in Seoul, Korea. The subjects were 8,010 new patients who visited the department of Pediatric dentistry of Seoul National University Dental Hospital in 2004-2005. Clinical and radiographic records of the patients were reviewed by the primary investigator who is a pediatric dentist. Notable eruption disturbances included delayed eruption, early eruption and ectopic eruption and the prevalence of eruption disturbance was 8.79%.

Wiskott-Aldrich 증후군 환아의 증례보고

이연주,현홍근,장철호,김영재,김정욱,장기택,김종철,한세현,이상훈 대한소아치과학회 2007 大韓小兒齒科學會誌 Vol.34 No.3