• 대한수학회논문집
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• 제37권1호
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• pp.293-301
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• 2022

The present paper concerns with a study of certain generating functions and summation formulas of generalized Poisson-Charlier polynomials. Some special cases are also discussed.

• 한국강구조학회 논문집
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• 제20권1호
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• pp.131-149
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• 2008

최근 급증하는 전력수요 충족을 위해 송전선로 및 송전철탑의 대형화가 진행되고 있다. 국내 송전철탑 설계기준에서는 선로방향하중에 대해 상시와 이상시로 구분하여 검토하고 있다. 송전철탑 붕괴의 가장 큰 원인이 되고 있는 선로 단선으로 인한 이상시 철탑 주재의 안전성 검토가 필요하다. 국내 설계기준은 축력이 지배적인 트러스요소를 철탑에 적용하고 있으며, 단선으로 인한 불평형 하중을 암끝단에 재하하도록 하고 있다. 불평형 하중을 유발하는 단선은 두 곳에서 동시에 발생하는 경우까지 고려하고 있으며, 그 이상 여러 상의 전선이 동시에 단선되는 것은 고려하고 있지 않다. 이에 본 연구는 발생 가능한 모든 단선의 경우에 대해서 보요소를 적용한 유한요소해석을 실시하여 극한상태를 파악하고 국내 설계기준에 따른 안전성를 평가하였다. 유한요소해석 결과분석을 통해 철탑 주주재에는 이상시 휨응력의 영향력이 매우 크게 나타났으며, 비대칭 일측의 모든 전선이 단선된 경우 기존 철탑의 설계방법이 안전하지 않음을 알 수 있었다. 따라서 이상시 철탑의 경제성과 정확한 안전성 확보를 위해 부재의 극한상태와 이상시 발생빈도를 고려하는 설계법의 적용이 필요할 것으로 판단된다.

• 국제교류와 융합교육
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• 제3권2호
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• pp.29-45
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• 2023

이 연구는 현재 운영 중인 자율학교의 현황을 토대로 과제를 모색하는데 목적을 두고 있다. 연구방법은 문헌연구의 방법을 사용하였다. 그리고 연구내용은 자율학교의 의의와 발전, 자율학교의 유형, 자율학교의 현황과 과제의 영역으로 구분하였다. 자율학교의 의의와 발전에서는 표준화·규격화된 교육에서 소외가 발생함에 따라 학교교육제도를 포함한 교육제도의 개선과 발전을 위해 학교 및 교육과정 운영의 특례가 인정되는 자율학교가 제도적으로 보장되는 과정을 설명하였다. 다음으로 자율학교의 유형에서는 일반형 자율학교와 제주형 자율학교로 구분하여 논의하였다. 일반형은 초·중등교육법에 법적 근거를 두고 있고, 제주형은 제주특별법에 의해 운영이 되며 내용적 사항도 차이가 있어 이들의 특징적인 면을 살펴보았다. 마지막으로 자율학교의 현황과 과제에 대해 논의하였다. 법적 근거와 내용을 달리하는 일반형과 제주형의 특징적인 면을 살펴보고, 그에 따른 과제를 제시하였다. 과제는 자율학교의 수가 많고, 지역별·유형별 편중이 심하며, 교장 자격과 학교운영위원회 등 주로 제도적 측면에 대한 특례의 활용이 많고, 제주의 경우 인력 지원의 원활성이 있는 점으로 제시하였다. 이들 논의 결과 형식적인 자율학교의 운영이 아니라, 내실있는 자율학교의 운영이 요청되었다.

• Journal of Chest Surgery
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• 제28권8호
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• pp.778-783
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• 1995

The incidence of chest wall tumor is rare than those of other portions of the body. The chest wall tumors need special attention about their diagnosis and management than other tumors. From March, 1985 to September, 1994, 33 patients with chest wall tumor underwent surgical treatment, and those were consisted of 28 benign tumors and 5 malignant tumors arising from soft tissue, rib and sternum.Benign tumors were included 11 lipoma, 4 cysticercosis, 2 chondroma and 1 each of fibroma, dermatofibroma, osteochondroma, fibrous dysplasia and hemangioma,and 6 other cases. Malignant chest wall tumors were included 2 metastatic carcinoma,1 each of giant cell tumor, chondrosarcoma and epithelioid sarcoma.Sex ratio of male to female was 1.5:1, and the range of age was 16 to 72 years,and the mean age was about 40 years. Clinical manifestations of chest wall tumor were palpable mass[55% , pain[21% ,tender mass[9% , growing mass[9% and asymptomatic[9% .The all cases were treated surgically, the results were as follows:Local excision 16 cases, wide resection 12 cases, wide resection with chemotherapy 3 cases, each one case of wide resection with radiotherapy and wide resection with chest wall reconstruction.

• Imaging Science in Dentistry
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• 제36권2호
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• pp.81-88
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• 2006

Purpose : To review developmental salivary gland defect based on 12 reported cases and literature, and to guide radiographic diagnosis of this entity. Materials and Methods : The 12 cases of developmental salivary gland defect of Chosun University Dental Hospital in the last 4 years were analyzed and compared with previous reported cases. Result : 11 of the 12 cases were found in men, indicating a very strong male predilection. The peak age was in the 6th decade. These defects were situated just above or at the inferior border of mandible between the first molar and the mandibular angle, and always Inferior to the mandibular canal. Only one case was superimposed with the mandibular canal, 6 cases were superimposed with the inferior border of the mandible. Conclusion : Characteristically, these defects had a special radiographic features such as ovoid shaped well-defined radiolucency located just above or at the inferior border of the mandible between the first molar and the mandibular angle, and always inferior to the mandibular canal. The recognition of these radiographic features were diagnostically valuable.

• Structural Engineering and Mechanics
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• 제7권5호
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• pp.513-525
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• 1999

This paper presents exact close form solutions of plastic limit loads of a clamped circular plate under uniformly distributed load with different loading radii. A unified yield criterion, which includes a family of piecewise linear yield criteria and the commonly adopted yield criteria such as the Tresca criterion and the maximum principal deviatoric stress criterion or the twin shear stress criterion that are its special cases, and the Mises criterion can be approximated by it, is employed in the analysis. The plastic limit loads, moment fields and velocity fields of the clamped circular plate are calculated based on the unified yield criterion. The influences of the yield criteria, the edge effects and the loading radius on the plastic limits of the clamped circular plate are investigated. Analytical results are calculated and compared. The exact close form solutions presented in this paper provide efficient approaches for obtaining plastic limit loads and the corresponding moments and velocities of the clamped circular plates. The previously derived solutions based on the Tresca and the Mises criteria are its special cases.

• Management Science and Financial Engineering
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• 제22권1호
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• pp.5-12
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• 2016

We consider a time-cost tradeoff problem with multiple milestones under a chain precedence graph. In the problem, some penalty occurs unless a milestone is completed before its appointed date. This can be avoided through compressing the processing time of the jobs with additional costs. We describe the compression cost as the convex or the concave function. The objective is to minimize the sum of the total penalty cost and the total compression cost. It has been known that the problems with the concave and the convex cost functions for the compression are NP-hard and polynomially solvable, respectively. Thus, we consider the special cases such that the cost functions or maximal compression amounts of each job are identical. When the cost functions are convex, we show that the problem with the identical costs functions can be solved in strongly polynomial time. When the cost functions are concave, we show that the problem remains NP-hard even if the cost functions are identical, and develop the strongly polynomial approach for the case with the identical maximal compression amounts.

• 의료법학
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• 제15권1호
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• pp.165-181
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• 2014

Advertisements and labels provided by businesses are highly likely to contain false or exaggerated content because of the business's purposes. In these cases, it is difficult to deliver proper information to consumers, and regulation is necessary to some extent. In particular, information delivery is more important in the health medical and biotechnology areas than any other because of their specialized characteristics. The Fair Labeling and Advertising Act regulates ordinary content for labels and advertisements, while individual laws stipulate regulations for false or exaggerated advertisements and labels. Criminal law might apply in fraud cases depending on their characteristics. Therefore, consistency is needed among criminal fraud laws and regulations, the Act on Fair Labeling and Advertising, and legal punishment. However, a review of all these laws found that there is no such consistency. Accordingly, this paper asserts the need for improvement in this area.

• 동의생리병리학회지
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• 제21권4호
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• pp.1025-1029
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• 2007

It is widely assumed that Intelligence Quotient (IQ) is determined by inherent disposition and environmental factor. IQ is estimated by age-conversion score and stabilized around age 4 and IQ of adult age can be predicted after age 10. Though children with Mental Retardation (MR) are delayed in language development since early infant period, they receive only special education including speech and language therapy, but no special medication. In traditional Korean medicine, the etiology and treatment for developmental delay of language have been handed down for a long time. Some studies on herbs and prescriptions for improving language development have been undertaken recently. We have found several cases of significant elevation of IQ in the children treated with long term medications of Korean herbal medicine for improvement of language. Analyzing these cases, especially performance IQ showed significant change. Therefore we suggest that Korean herbal medicine might improve cognition development in children with MR.

• World Technopolis Review
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• 제1권2호
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• pp.129-140
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• 2012

This paper presents, from a broad perspective, the manner in which various types of clusters and options for regional development have evolved in Korea over the past decade, with particular emphasis on who have taken initiative in establishing the clusters. Characterized by not only progress but also setbacks, two distinctive patterns have emerged: centralized de-concentration and regionalized concentration. Both the Korean government and numerous localities have continuously extended efforts to create different clusters, technology parks, special districts, etc. In many cases, local or regional governments have competed intensely for clusters to be located in their jurisdictions; in particular, concerted efforts to convince national governments to set up special districts have been witnessed. On the other hand, major localities have made their own efforts to generate large- and small-scale clustering projects. It remains to be seen how different outcomes or effectiveness these two approaches will make in the future. Following the review of relevant literature and practices, I examine the well-known national campaign and projects in the previous administration in Korea in the context of 'de-concentration' of economic values and resources. Thereafter, other cases initiated mostly by local governments are discussed; some of these clustering efforts and regional projects have fared well thus far, but some haven't. In the case of Daegu, the progress of some critical projects, such as the Daegu Technopolis and a Free Economic Zone, is elaborated.