• Journal of KIISE
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• v.44 no.7
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• pp.703-709
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• 2017

Outsourcing databases is to offload storage and computationally intensive tasks to the third party server. Therefore, data owners can manage big data, and handle queries from clients, without building a costly infrastructure. However, because of the insecurity of network systems, the third-party server may be untrusted, thus the query results from the server may be tampered with. This problem has motivated significant research efforts on authenticating various queries such as range query, kNN query, function query, etc. Although aggregation queries play a key role in analyzing big data, authenticating aggregation queries has not been extensively studied, and the previous works are not efficient for data with high dimension or a large number of distinct values. In this paper, we propose the AMR-tree that is a data structure, applied to authenticate aggregation queries. We also propose an efficient proof construction method and a verification method with the AMR-tree. Furthermore, we validate the performance of the proposed algorithm by conducting various experiments through changing parameters such as the number of distinct values, the number of records, and the dimension of data.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.8
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• pp.5442-5451
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• 2015

The purpose of this study was to examine the affection factors of quality of life in thyroid cancer patients after thyroidectomy. The subject of this study were 125 patients with thyroid cancer who were receiving operation and outpatient medical examination in general hospital in Gwangju city. Data were analysed using descriptive statistics, t-test, one-way ANOVA, Sheffe test, Pearson correlation analysis and stepwise multiple regression analysis using SPSS 21.0 program. The significant factors influencing quality of life were depression(${\beta}=-0.39$, p<.001), spiritual fatigue(${\beta}=-0.30$, p<.001) and physical fatigue(${\beta}=-0.24$, p<.001), which explained 57.2% of the quality of life. Therefore, it is necessary to develop nursing intervention program reducing fatigue and depression for thyroid cancer patients after thyroidectomy.

• The Journal of Korean Association of Computer Education
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• v.7 no.4
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• pp.121-129
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• 2004

If we followed to be based on the result of survey for researching on the actual condition about e-Learning of the MOE(2004), the critical problem has been suggested managing the quality of teaching and learning materials(37.68%(1775/4717)). If we also reviewed the research of the KICE(2002), the superior material's rate of 70,000 teaching and learning materials of the web site, the educational organization, and teachers was 8.7%. There was some suggestions about the quality problem of the teaching and learning material, but there wasn't the alternative policy: there wasn't the systemic program for managing the message quality of teaching and learning materials. The purpose of this study was to develop the alternative system for managing the message quality of teaching and learning materials. The alternative system of this study's result will be the basic to build the system for managing the message quality of teaching and learning materials. I expect that my system will be the useful tool for managing the message quality of teaching and learning materials.

• Journal of KIISE:Computing Practices and Letters
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• v.6 no.1
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• pp.11-20
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• 2000

Many object query languages including OQL(the query language proposed by theOBMG) allow query block to be nested in any clause: select clause, from clause and where clause. The processing of nested queries can affect the performance of its query processor Therefore, an OQL query processor should have effective optimizing techniques for nested queries. This paper designs and implements a new framework of an unnesting front-end for an OQL query processor This unnesting module can minimize implementation overhead when developing a new OQL processor or extending an existing query processor to be equipped with an unnesting facility This is accomplished by separation between logical algebra operators used in an unnesting front-end and ones in a query optimizer.

• Korean Journal of Family Social Work
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• no.56
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• pp.225-250
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• 2017

The purpose of this research was to investigate the impact of the social capital among married female immigrant on their quality of life and the mediating effect of empowerment. The data were collected from 260 married female immigrants and SPSS Statistics 20.0 and AMOS 22.0 were utilized to analyze the data. The results showed that social capital had statistically significant relationship with empowerment and quality of life among married female immigrants. In addition, empowerment was a statistically significant mediator in the association of social capital and quality of life. Based on these findings, the implications for social welfare practice to improve social capital and empowerment of married female immigrants and recommendations for the further studies were suggested.

• Korean Journal of Comparative Education
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• v.22 no.4
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• pp.99-123
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• 2012

Quality assurance is a central issue concerning higher education and distance education. The purposes of this study are to analyze cases of quality assurance system in overseas open university and to draw implications which help establish quality assurance system in domestic distance education institution. UKOU and UT are mega-university with more than 100.000 enrolled students. They have centralized quality assurance system and quality assurance department that is responsible for building and installing quality assurance for effective quality control. In addition, They have quality improvement culture that seeks continuous improvement. Members of the University share awareness of the importance of quality assurance and evaluate and monitor their work. Because results for quality assurance of education is not tangible, quality assurance system is carefully planned over a long period of time as is necessary to proceed in integration.

• Journal of Digital Convergence
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• v.18 no.12
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• pp.293-302
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• 2020

This study was aimed to identify factors affecting the health related quality of life in elderly according to living type. This study used data from the 7th-3 Period Korea National Health and Nutrition Examination Survey. Data were analyzed using the SPSS program. The health related quality of life of living-alone elderly was lower than that of living-together elderly. The significant predictors of health related quality of life of living-alone elderly were depression, subjective health status, age, stress. The significant predictors of health related quality of life of living-together elderly were depression, subjective health status, age, gender. injury, stress. These results suggested that the living type affect the health related quality of life. The influencing factors should be reflected in the relevant program development.

• Bulletin of the Korea Photovoltaic Society
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• v.2 no.1
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• pp.6-17
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• 2016

최근 태양광 시장은 생산량 증가와 제조단가 하락이 동시에 이루어지고 있으며 결정질 실리콘 태양전지가 시장을 주도하고 있다. 그 중에서도 결정질 실리콘 태양전지는 제조단가의 40% 이상을 차지하는 실리콘 원자재 비용을 줄이기 위해 두께를 줄이고자하는 노력에 관심이 집중되고 있다. 본 논문에서는 상용 결정질 실리콘 태양전지에서 사용되는 기술이 박형 결정질 실리콘 태양전지에 적용될 때 생기는 문제점과 이를 극복하기 위한 기술에 대해 박형 실리콘 웨이퍼, 박형 결정질 실리콘 태양전지, 박형 결정질 실리콘 태양전지 모듈 전반에 걸쳐 논하려고 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.896-899
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• 2017

본 논문에서는 일상생활 환경에서 동작하는 지능형 서비스 로봇을 위한 시 공간 상황 질의 언어와 질의 처리 방안을 제안한다. 서비스 로봇이 외부 환경 변화를 정확히 인식하고 행동 절정에 신속히 반영하기 위해서는 로봇 내부에서 관리되는 상황 지식들이 매우 높은 시간 의존성을 가져야 한다. 본 논문에서 제안하는 상황 질의 언어인 RCQL은 시간 의존성이 높은 공간 관계 상황 지식들을 효과적으로 표현할 수 있도록 Allen의 간격 대수 이론에 기초한 시간 연산자들을 포함하고 있다. 물체들 간의 고수준 공간 관계 상황 지식을 조회하는 RCQL 질의들에 신속히 답하기 위해, 본 논문에서는 후향 정량 추론을 포항한 질의 처리기의 설계 방안도 제시한다. 다양한 실험을 통해 본 논문에서 제안하는 상황 질의 언어와 질의 처리 방안의 우수생을 확인할 수 있었다.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10b
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• pp.395-397
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• 1998

현재 데이터마이닝과 관련하여 많은 주제들이 다루어지고 있다. 하지만, 전체적인 마이닝 시스템과 관련하여 마이닝 질의 언어 및 효율적인 질의 처리 방식에 대한 체계적인 연구는 충분하지 못한 것 같다. 따라서 본 논문에서는 과거 구현된 바 있는 마이닝 질의 처리기를 기반으로 하여 질의처리의 융통성을 제공하며, 효율적인 질의 처리를 취한 방법론에 대해 다루고자 한다. 과거 구현되었던 마이닝 질의 처리기는 데이터웨어하우스에 있는 primitive 데이터들을 마이닝 시스템에서 사용할 수 있도록 추출하여 보여주는 역할을 했는데, 단순히 primitive 단위의 데이터들에 대한 접근 뿐 아니라, 현재 데이터마이닝 분야에서 연구 중에 있는 개념 계층이라는 구조를 이용하여 일반화된 데이터 및 에트리뷰트들에 대한 계층적인 정보를 이용하여 체계적이며, 효율적인 마이닝 질의 처리를 가능하게 하고자 한다.