• 한국치위생학회지
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• 제10권2호
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• pp.393-411
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• 2010

Objectives : The purpose of this study was to examine factors related to the satisfaction level of patients with dental services. Methods : The subjects in this study were 200 patients at three different dental clinics in South Gyeongsang Province, on whom a survey was conducted from June 1 to July 31, 2009. The collected data were analyzed, and the findings of the study were as follows. Results : In regard to the general characteristics of the patients investigated, the women(61.5%) out-numbered the men. By age, those who were at the age of 30 and down made up the largest age group(47.0%). By academic background, the greatest group received junior-college education(54.0%). By occupation, the company employees constituted the largest group (50.5%). By income, the greatest group earned an income of 2 to 2.99 million won(75.0%). Second, as to connections between the characteristics of dental treatment and the reason of choosing the dental clinics, the largest group(70.4%) chose the dental clinics by word of mouth or the recommendation of others. Concerning the reason of dissatisfaction, the biggest group(72.7%) was unsatisfied with medical costs. As for the degree of explicit complaint, the greatest group(49.7%) sort of complained about what made them dissatisfied. Regarding the type of treatment, the biggest group(49.0%) received prosthodontic treatment. In relation to fear for dental treatment, the largest group(34.0%) feared receiving the treatment, and the biggest group(42.6%) did that due to the sound of machines. Third, satisfaction with services(0.762) had the closest correlation to overall satisfaction level, followed by satisfaction with employees(0.735), satisfaction with dentists(0.644) and satisfaction with convenient facilities (0.579). Fourth, the factors that affected overall satisfaction level were gender, the reason of choosing the dental clinic, satisfaction with dentists, satisfaction with employees, satisfaction with services and satisfaction with convenient facilities. The patients who were better satisfied with services(p<0.001), who were more contented with dentists(p<0.001), who chose the dental clinics by the recommendation of others(p<0.01), who were male(p<0.05), who were more gratified with employees(p<0.05) and who were more contented with convenient facilities expressed better overall satisfaction. Conclusions : The above-mentioned findings suggested that dental institutions should keep track of the expectations of patients to prepare differentiated strategies for marketing and human-resources development in consideration of their own circumstances to boost the satisfaction level of patients. Specifically, it's required to heighten the satisfaction level of patients with dentists.

• 한국초등과학교육학회지:초등과학교육
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• 제34권3호
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• pp.325-337
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• 2015

The purpose of this study was to investigate the effects of a teaching-learning program using the history of science on elementary school students' academic achievement, science attitude, and science process skill. Subjects were 72 students of two groups in the 5th Grade. A experimental group of 36 was instructed 10 lessons in unit of 'our body' using the history of science. The history of science materials used in this program included 4 explicit method, which are Eii, Eij, Eik and Ea type, and 1 implicit method which is I type. The contents validity of this program was reviewed by the science education specialists. The results of the study were as follows: Students of experimental group showed statistically more significant increase in academic achievement and science attitude than control group students. However, there was no significant difference on science process skill between the instruction by applying a teaching-learning program using the history of science and the traditional instruction. Since this program using the history of science is effective for the attitude improvement of elementary school students as well as academic achievement, it is highly likely to be used as the science education material for students with the low affective area.

• 대한수학교육학회지:학교수학
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• 제12권2호
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• pp.137-150
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• 2010

이 연구는 초등학교 저학년 수학부진아들의 수세기 능력을 조사하고, 이를 토대로 수학부진아 지도를 위한 시사점을 도출하고자 하였다. 이를 위해 초등학교 2학년 수학부진아 4명을 실험군으로 하고, 4학년 수학부진아 4명과 2학년 일반 학생 2명을 비교군으로 하여, 일대일 면담을 실시하였다. 학생들의 수세기 능력은 정확성, 속도, 효율성의 세 가지 관점에서 분석되었으며, 연구 결과는 다음과 같다. 첫째, 저학년 수학부진아들의 수세기 능력은 매우 낮았으며, 사소한 실수나 체계적인 오류, 더딘 수행, 비효율적인 전략 구사 등의 문제점을 드러냈다. 둘째, 학년 상승과 더불어 수세기의 속도는 어느 정도 개선되지만, 수세기의 정확성이나 효율성은 크게 개선되지 않았다. 셋째, 수세기 능력과 연산 과제 수행 능력 간의 명확한 상관관계는 도출하지 못했지만 개연성이 있음은 확인하였다. 이상의 연구 결과를 통해, 저학년 수학부진아들에게 수세기 활동을 좀 더 강조해서 지도해야할 필요성이 있음을 이끌어 내었다.

• Journal of Preventive Medicine and Public Health
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• 제34권4호
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• pp.354-362
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• 2001

Objectives : The aim of this study was to estimate the burden of disease through an analysis of Years of Life Lost due to premature deaths, one component of the Disability-Adjusted Life years (DALY). In addition, the cause of death statistics were adjusted to improve validity, and the results were compared with those of the Global Burden of Disease (GBD). Methods : In closely fellowing the approach taken in the original GBD study, most of the explicit assumptions and the value judgments were not changed. However, the statistics for some problematic concerns such as deaths of infants or those due to senility, were adjusted. Deaths, standard expected years of life lost (SEYLL), and potential years of life lost (PYLL) were computed using vital registration data compiled by the National Statistical Office. Results : The burden for males is 1.8 and 2.3 times higher than that for females, according to SEYLL and PYLL, respectively. The proportions of deaths due to Group I, II, and III causes are 5.4%, 80.4%, and 14.3%, respectively, for PYLL, but in a major shift from Group II to III they are 6.3%, 66.2%, and 27.5%, respectively, for SEYLL. The proportion of Group III causes in Korea, 27.5%, is extremely high when compared to 10.1% for the world, 7.6% for developed countries, and 10.7% for developing countries. Conclusions : Estimation results showed that the total burden due to premature deaths is smaller than that for the entire world but larger than that for developed countries. The disease structure of Korea has changed to resemble that of developed countries. Also, an overly large portion of the total burden in Korea stems from injuries arising from car accidents.

• 한국과학교육학회지
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• 제22권3호
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• pp.466-477
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• 2002

본 연구에서는 바람직한 질문의 일반적인 예를 제시하고 질문 만들기를 연습시킴으로써 학생 질문의 양과 질의 향상을 기대한 종전의 연구와 달리 적절한 물리 연습 문제 풀이를 통해서 학생의 질문이 향상될 것을 가정하였다. 이 연습에서는 전문가가 물리 문제를 풀 때 사용하는 방략을 단계적인 문제 풀이 안내의 형태로 구성하였는데 각 단계에서 조작적인 지시 사항을 사용하여 학생에게 기대되는 행동을 명시적으로 제시했다는 뜻에서 가시화 연습이라고 하였다. 이러한 문제 풀이 과정은 이해가 부족한 부분을 구체적으로 인식하도록 돕고 따라서 학생이 스스로의 질문을 정확하게 인식하고 표현하는데 긍정적인 영향을 미칠 것으로 기대되었다. 연구의 대상은 이공계 물리학 강좌를 수강하는 서울지역 대학 일학년 학생이었다. 수업의 대부분은 동일하고, 다만 연습문제 풀이를 할 때 실험집단은 전문가의 문제 풀이 방략을 가시화하는 연습 활동을 했고, 통제집단 학생들은 교과서에 있는 연습 문제를 전통적인 방법으로 풀었다. 학생들의 질문을 조사하기 위해 과제물을 부여할 때 또는 시험을 실시할 때 자신이 어려웠던 부분에 대해서 서술할 것을 요철하였다. 즉 본 연구에서 질문은 학생들이 자신의 경험한 어려움에 대해서 글로 서술한 것을 의미하며 의문문의 형태가 아닐 수도 있다. 수집된 질문을 질문의 양과 질, 두 가지 측면에서 분석하였다. 실험집단의 학생들은 통제 집단의 학생들보다 자발적으로 질문을 표현하는 경향이 있었다. 학생 질문의 내용에서 많이 관찰된 첫째 특성은 자신의 어려움에 대한 구체적인 표현의 중가이다. 두 번째 특성은 과정적 지식의 지식의 필요를 인식했다는 점이다. 구체적인 표현과 과정적 지식에 관한 인식은 모두 실험집단에서 다 많이 관찰되었다.

• Genomics & Informatics
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• 제10권1호
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• pp.51-57
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• 2012

Mining interesting patterns from DNA sequences is one of the most challenging tasks in bioinformatics and computational biology. Maximal contiguous frequent patterns are preferable for expressing the function and structure of DNA sequences and hence can capture the common data characteristics among related sequences. Biologists are interested in finding frequent orderly arrangements of motifs that are responsible for similar expression of a group of genes. In order to reduce mining time and complexity, however, most existing sequence mining algorithms either focus on finding short DNA sequences or require explicit specification of sequence lengths in advance. The challenge is to find longer sequences without specifying sequence lengths in advance. In this paper, we propose an efficient approach to mining maximal contiguous frequent patterns from large DNA sequence datasets. The experimental results show that our proposed approach is memory-efficient and mines maximal contiguous frequent patterns within a reasonable time.

• 한국의료질향상학회지
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• 제2권1호
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• pp.118-124
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• 1995

Background: Clinical indicators are objective measures of process or outcome of patient care in quantitative terms. This study aims to review the medical records of patients who 'return to operating room during the same admission', which is one of the critical clinical outcomes, and describe the result by unplanned reoperation rate. Methods: Computerized patient registry was used for selecting subject conditions. For medical records retrieved, two nurse evaluators identified the presence of explicit reoperation planning in medical records. Results: Overall reoperation rate was 2.8% and unplanned reoperation rate 1.3%. The main category of reoperation cause was the postoperative bleeding. Duration of stay from previous operation to reoperation of the unplanned group, 12.7 days, was shorter than that of the planned(p< .05). The differences did not reach statistical significance in age, sex and length of stay. Conclusion: Results suggested that unplanned reoperation rate was lower than 'threshold' level other institutions had established. However, this result could become comparable only after management of medical records would be improved and risk adjusted.

• 한국콘텐츠학회논문지
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• 제12권3호
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• pp.434-441
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• 2012

축대칭 함몰지형 위를 통과하는 파의 변형에 관한 확장형 완경사 방정식의 해석해를 유도하였다. 함몰지형내의 수심은 함몰지형의 중심으로부터의 거리의 멱에 비례하여 변화된다. 지배방정식은 변수분리법을 이용하여 상미분방정식으로 변환되었으며 Hunt(1979)의 근사식을 이용하여 계수들을 파속과 군속도의 항으로 이뤄진 양함수의 형태로 나타냈다. 확장형 완경사 방정식의 바닥의 곡률과 경사의 제곱으로 이뤄진 항은 멱급수형태로 변환하였다. 마지막으로 Frobenius 급수를 사용하여 확장형 완경사 방정식의 해석해를 유도하였다. 유도된 해석해는 FEM으로 도출된 수치해와 기존의 완경사 방정식의 해석해와 비교하여 검증하였다.

• International Journal of Concrete Structures and Materials
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• 제1권1호
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• pp.29-36
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• 2007

The purpose of this paper is the assessment of the capacity of the reinforced concrete (RC) elements of an arch bridge when they are subjected to contact and near-contact explosive charges of various amounts, and the estimation of the critical charges for these components. The bridge considered is the Tenza Viaduct, a decommissioned structure south of Naples, Italy. Its primary elements, deck, piers and arches were analyzed. The evaluation was accomplished via numerical analyses that made possible to obtain the elements dynamic response when they are exposed to blast loading conditions. To evaluate the member's capacities, failure criteria for deck, piers and arches were proposed based on concrete damage parameters. Additionally, curves relating the explosive charge to the residual capacity and to damage level of the elements were also developed. The results of this work were taken into account to investigate the progressive collapse of the global structure.

• Smart Structures and Systems
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• 제3권4호
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• pp.439-454
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• 2007

In this paper a damage imaging technique using pre-stack migration is developed using Lamb (guided) wave propagation in composite structures for imaging multi damages by both numerical simulations and experimental studies. In particular, the paper focuses on the experimental study using a finite number of sensors for future practical applications. A composite laminate with a surface-mounted linear piezoelectric ceramic (PZT) disk array is illustrated as an example. Two types of damages, one straight-crack damage and two simulated circular-shaped delamination damage, have been studied. First, Mindlin plate theory is used to model Lamb waves propagating in laminates. The group velocities of flexural waves in the composite laminate are also derived from dispersion relations and validated by experiments. Then the pre-stack migration technique is performed by using a two-dimensional explicit finite difference algorithm to back-propagate the scattered energy to the damages and damages are imaged together with the excitation-time imaging conditions. Stacking these images together deduces the resulting image of damages. Both simulations and experimental results show that the pre-stack migration method is a promising method for damage identification in composite structures.