The gap between expectations and reality: integrating computers into mathematics classrooms

Bu¨ lent Gu¨ven 서울대학교 교육연구소 2009 Asia Pacific Education Review Vol.10 No.4

As a result of dramatic changes in mathematics education around the world, in Turkey both elementary and secondary school mathematics curriculums have changed in the light of new demands since 2005. In order to perform the expected change in newly developed curriculum, computer should be integrated into learning and teaching process. Teachers' beliefs play a key role in this integration process. Negative beliefs against using computer in mathematics teaching may lead to failure of this process. With the help of this study, it is aimed to detect mathematics teachers' beliefs concerning Computer Assisted Mathematics Instruction (CAMI). Within the scope of this aim, the conducted questionnaire (The opinions of teachers about using computer in Mathematics Instruction) has been carried out on 91 mathematics teachers in the city of Trabzon. The acquired results have shown that mathematics teachers have developed negative opinions against CAMI. This state has revealed that there is a huge inconsistency between curriculum's positive expectations arising from computer usage and teachers' convictions.

Anesthetic management for dental surgery in a child with glycogen storage disease type IIIa: a case report

Buğra Aykenar,Nedim Çekmen 대한치과마취과학회 2022 Journal of Dental Anesthesia and Pain Medicine Vol.22 No.6

Glycogen storage disease (GSD) is a group of inherited disorders, which result in the deficiency of enzymes involved in glycogen metabolism, leading to an accumulation of glycogen in various organs. Deficiency of amylo-1-6-glicosidase (debranching enzyme) causes glycogen storage disease type III (GSD III). The main problems that anesthesiologists face in patients with GSD III include hypoglycemia, muscle weakness, delayed awakening due to abnormal liver function, possible difficulty in airway, and cardiomyopathy. In the face of these difficulties, airway preparation and appropriate glucose monitoring and support during the fasting period are important. The doses of the drugs to be used should be calculated considering the increased volume of distribution and decreased metabolic activity of the liver. We present the case of a child with GSD IIIa who underwent dental prosedation under general anesthesia. She was also being prepared for liver transplantation. This case was additionally complicated by the patient’s serious allergic reaction to eggs and milk.

A rare case of shingles after COVID-19 vaccine: is it a possible adverse effect?

Saliha Buşra Aksu,Güzin Zeren Öztürk 대한백신학회 2021 Clinical and Experimental Vaccine Research Vol.10 No.2

Coronavirus disease 2019 (COVID-19) exhibit mild to moderate symptoms, whereas 15% of COVID-19 cases progress to pneumonia, some associated cutaneous findings are also reported as maculopapular eruptions, morbilliform rashes, urticaria, chickenpox-like lesions, and livedo reticularis. The inactivated COVID‐19 vaccines are authorized for use in some countries including Turkey. Here, we report an unusual case of varicella-zoster virus (VZV) reactivation in a 68-year-old male patient who was vaccinated against COVID-19. The patient presented to family medicine clinic with a stinging sensation and pain radiating from the right side of his chest to his back. Physical examination revealed multiple pinheaded vesicular lesions upon an erythematous base occupying an area on his right mammary region and back corresponding to T3–T5 dermatomes. He reported that he got his second dose of COVID-19 vaccine 5 days ago. As COVID 19 decreases the cell-mediated immunity, it could also increase the risk of herpes zoster (HZ). Although the exact reason remains unsolved, vaccine-induced immunomodulation caused by live attenuated vaccines and attenuated alloreactivity caused by inactivated vaccines may be responsible mechanisms for the reactivation of HZ. Epidemiological studies are needed to clarify the possible connection between vaccination and reactivation of herpesvirus infections.

망간과 코발트 혼합산화물의 전해방법 및 활성도에 관한 연구

康富夫,金德默 단국대학교 대학원 1988 學術論叢 Vol.12 No.-

Mixed oxides containing cobalt oxides in electrolitic manganese dioxide have been prepared by on electrochemical process on titanium anode and cathode with manganes nitrate and cobalt nitrate solution. These oxides have been prepared in various electrolysis conditions current density, bath temperature, and Mixing Ratio. According to there results, current efficiency was excellent in low current density and high bath temperature, and there mixed oxides were superior to IC Sample Activity percentage value of these oxides has heigher value than one of IC Sample. By X-ray diffraction pattern, when low current density, crystal structure is homogeneous and discharge capacity is excellent.

Multimodality Imaging of Large Left Ventricular Apical Pseudoaneurysm after Thoracic Surgery

Mahmut Buğrahan Çiçek,Ahmet Karaduman,İsmail Balaban,Alev Kılıçgedik,Cevat Kırma 대한심장학회 2020 Korean Circulation Journal Vol.50 No.9

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망간전지의 방전 메카니즘에 관한 연구

金德默,康富夫 단국대학교 1987 論文集 Vol.21 No.-

The discharge reaction mechanism of the Leclanche cells was studied. The cell were discharged through flash light continuously. Discharge products were examined by chenical analysis and X-Ray diffraction. The discharge reaction product was MnOOH in a homogeneous solid-phase reaction. The X-Ray diffraction evidence on the single phase reduction of MnO^2 to MnOOH were presented. The products of these discharge reactions will be dependent on the kinds of Manganese Dioxide, electrloytes, potentials, and depth of discharge.

疫學 파라메터에 關한 推測

손부순 순천향대학교 기초과학연구소 2000 순천향자연과학연구 논문집 Vol.6 No.1

For the investigation of the relationship between the exposure and the disease, it is necessary to infer the degree of the relationship. Some biologically deducible epidemiology parameters are useful for this. These parameters are the difference between risks, the rate ratio, the rate difference, and the assumption rate ratio by Odd's ratio. The investigation of the degree of inferential epidemiology parameters is important. and it is manifested by the confidential interval.

大氣汚染 疫學에 있어서의 暴露評價에 대하여

孫富順,朴鍾安 서울大學校保健大學院 1995 國民保健硏究所硏究論叢 Vol.5 No.2

「Total Exposure」의 개념에 기초하여, 大氣汚染의 健康影響 關한 疫學硏究를 再構築한다고 하는 시도는, 아직 시작한 단계에 불과하다. 지금까지 實施된 疫學硏究를 이와같은 暴露評價의 点에서 다시 보는것도 必要할 것이다. 暴露와 影響의 關連을 檢出할 수 있다는 感度의 点에서는, sample size와 誤分類의 問題가 Trade-off관계에 있는 것에 충분한 留意를 해야 한다. 엄밀한 意味에서는 Individual Exposure를 測定할 수 있는 Technology의 開發을 推進하지 않으면 안되지만, 한편으로는 質的評價와 量的 評價의 조합에 의해서 暴露評價를 精密化해 나가는 길도 探索할 必要가 있을 것이다.

회귀이상점 식별 알고리즘의 계산효율성과 정확성의 개선에 관한 연구

김부용,김새봄 숙명여자대학교 자연과학연구소 1997 자연과학논문집 Vol.- No.8

Hadi와 Simonoff(1993)가 제안한 회귀이상점 식별방법은 자료에 이상점이 다수 포함된 경우에도 이상점들을 효과적으로 식별할 수 있는 것으로 알려졌다. 그러나 식별 알고리즘의 미 단계에서 유사한 진단치를 반복적으로 계산하여 이를 바탕으로 이상점을 식별하기 위한 검정을 하므로 이에 요구되는 계산의 양이 매우 방대하다. 각 반복단계에서 기본부분집합이나 깨끗한 부분집합의 구성 형태를 분석한 결과, 소수의 관찰치만 변동되며 특히 하나의 관찰치만이 새로운 부분집합에 추가되는 경우가 많다는 사실을 확인하였다. 따라서 최신화 기법을 적용하여 필요한 계산을 효율적으로 실행할 수 있는 방법을 제안하였으며, 모의실험을 통하여 제안된 방법의 계산효율성이 우수함을 입증하였다. 한편, 구성된 부분집합의 자료는 악조건상태의 행렬인 경우가 많으므로 수치안정성에 문제가 발생하여 계산의 정확성이 낮아진다. 따라서 QR분해기법에 의해 진단치들을 계산하는 방안을 강구하였으며, 나아가서 계산의 정확성을 높이기 위해 반복 정제기법의 적용을 제안하였다. We investigate a procedure proposed by Hadi and Simonoff(1993) for the identification of multiple outliers in linear regression. The procedure is effective in the detection of multiple outliers, does not require presetting the number of outliers, does not require Monte Carlo simulation to determine cutoff values, and is relatively resistant to masking and swamping problems. However, it requires a great deal of computation since the diagnostics should be computed at each iteration. We have found that a small number of observations are changed, and at many iterations only one observation is added to the basic or clean subsets. Thus, to improve its computational efficiency, we propose an updating technique which can be applied to the computation of hat matrix, estimate of regression coefficients, residuals, and estimate of variances. Also the performance of the proposed technique is compared with that of the existing computing method on the basis of real and simulated data sets. It appears, from the Monte Carlo experiments, that the proposed technique is more computationally efficient than the existing one. On the other hand, since subsets constructed at each iteration are usually ill-conditioned, the numerical instability problem occurs and hence provokes inaccurate computations. Thus, QR-decomposition approach is employed to deal with the numerical instability problem, and the iterative refinement technique is used to obtain more accurate diagnostics.

硏究開發費 會計에 관한 硏究

高富彦 제주대학교 1985 논문집 Vol.20 No.2

In the face of the rapid changes in the environment and high technology. the strengthening of business earning power through R & D activities is essential to business survival and growth As the amount of investment for R & D activities is gradually increased. accounting for R & D costs may affect on the interests relationship among investors, creditors and others As accounting practices for R & D in our country don't have their own principles, they do not provide useful informantion to those who have intersted in business. The purpose of this study is to propose a desirable method for the accounting treatment and disc1osure of R & D costs by examining and comparing various accounting standards in advanced foreign countries Except in the U S A where expensing is mandated by FASB Statement No. 2, selective capitalization is in mode as showed in IAS. No. 9 and ASC Ⅰ support the selective capitalization theory that R & D costs. If specified conditions are fulfiled, should be capitalized when incurred and all other R & D costs should be charged to expense of the period In conclusion, as provisions for R & D costs in our country vary with laws and regulations, and accounting concepts have not been clearly formed, it is suggested that accounting method of R & D costs shoud be unified to reliable and rational standards