• 정보과학회 논문지
• /
• 제42권1호
• /
• pp.97-106
• /
• 2015

최근 데이터베이스 아웃소싱(Outsourcing) 환경에서 데이터 보호를 위한 암호화 기법 및 질의 결과 검증 기법에 대한 관심이 고조되고 있다. 그러나 기존 아웃소싱 데이터 암호화 기법들은 원본 데이터베이스 도메인 정보를 알고 있는 공격자에 의한 순서 매칭 공격 및 카운팅 공격에 취약한 문제점을 지닌다. 기존 질의 결과 무결성 검증 기법은 질의 결과 검증 데이터 전송 오버헤드 문제를 지닌다. 따라서, 본 논문에서는 데이터 보호를 위한 그룹 순서 보존 암호화 인덱스 및 이를 기반으로 한 질의 결과 무결성 검증 기법을 제안한다. 제안하는 기법은 순서 보존 암호화 인덱스를 통해 데이터를 암호화 하고, 복호화 없이 질의를 수행한다. 또한, 힐버트 커브를 통해 그룹 정보를 은닉함으로써, 질의 수행 과정에서 데이터 그룹 정보가 유출되는 것을 방지한다. 마지막으로, 주기함수 기반 그룹 분할 및 그룹 기반 인증을 통해 질의 결과 무결성 검증을 위한 데이터 크기를 감소시킨다. 성능평가를 통해, 제안하는 기법이 기존 버킷 기반 인증 기법에 비해 질의 처리 시간 측면에서 평균 1.6배, 검증 데이터 오버헤드 측면에서 최대 20배의 성능을 개선함을 보인다.

• 대한수학회보
• /
• 제46권1호
• /
• pp.183-198
• /
• 2009

In this paper, we derive a characterization of orthonormal balanced multiwavelets of order p in terms of the continuous moments of the multiscaling function $\phi$. As a result, the continuous moments satisfy the discrete polynomial preserving properties of order p (or degree p - 1) for orthonormal balanced multiwavelets. We derive polynomial reproduction formula of degree p - 1 in terms of continuous moments for orthonormal balanced multiwavelets of order p. Balancing of order p implies that the series of scaling functions with the discrete-time monomials as expansion coefficients is a polynomial of degree p - 1. We derive an algorithm for computing the polynomial of degree p - 1.

• 농촌계획
• /
• 제16권4호
• /
• pp.117-129
• /
• 2010

This study is to make value estimating system to valuate prototype landscape of rural and to derive itemized importance to select priority preservable object The results of the study are summarized as follows, It is examined value estimating standard by analyzing prototype landscape related previous study, law and order. Also, It is derived conclusive prototype landscape value estimating system by doing attribute assessment of preserving objects while surveying the site and interviewing professionals, Value estimating system is classified into five items of physical value which are integration, harmony, diversity, symbolism and aesthetics, The historical-cultural value are divided into four categories which are religious value, originality, historicity and scarcity, The communal values are divided into three categories which are sociality, continuing and regional locality and also divided into three categories which are rarity, primitiveness and diversity as the ecological value, Relative priority of prototype landscape value estimating system result is derived as historical-cultural value as the superior position and physical value, communal value and ecological value as the priority order. In the subordinate, historical categories are derived to be the most valuable and originality, symbolism, integration, regional locality, continuing, harmony, aesthetics, religious value, primitiveness, diversity of physical values and diversity of ecological value in order of the priority assessment The results of the study have the meaning of practical use in prior selection and preservation plan of preserving prototype landscape as practical alternative plan for systematical preservation of damaging prototype landscape.

• 대한간호학회지
• /
• 제45권5호
• /
• pp.733-741
• /
• 2015

Purpose: This study was a descriptive survey research to identify the impact of bowel function, anxiety and depression on quality of life in patients with rectal cancer who had a sphincter-preserving resection. Methods: Participants were 100 patients who had rectal cancer surgery at W hospital in Korea. Bowel function, anxiety & depression, and quality of life were measured using the BFI (Bowel Function Instrument), HADS (Hospital Anxiety-Depression Scale) and the FACT-C (Functional Assessment of Cancer Therapy-Colorectal). Results: The mean scores were $39.81{\pm}5.16$ for bowel function, $6.15{\pm}3.25$ for anxiety, $7.24{\pm}3.13$ for depression, and $72.50{\pm}13.27$ for quality of life. There were significant negative correlations between quality of life and anxiety (r= -.59, p <.001) and between quality of life and depression (r= -.53, p <.001). But the correlation between quality of life and bowel function was significantly positive (r=.22, p =.025). The influence of the independent variables on the total quality of life was examined using multiple regression analysis. Anxiety (${\beta}$= -.38, p =.002), bowel function (${\beta}$= -.25, p =.028) and occupation (${\beta}$=.16, p =.048) were identified as factors affecting quality of life. The explanation power of this regression model was 44% and it was statistically significant (F=16.53, p <.001). Conclusion: The results of this study indicate that in order to improve the bowel function of patients after sphincter-preserving resection for rectal cancer, effective nursing interventions should be developed. As psychological problem such as anxiety and depression can relate to quality of life for these patients, nurses should work on improving the situation by providing continuous emotional nursing.

• 전자공학회논문지
• /
• 제53권5호
• /
• pp.132-140
• /
• 2016

본 논문에서는 신뢰 영역을 검출하고 이를 이용하여 미스 매치된 영역에 대한 홀을 채우고 적응적으로 시차 지도를 조정하여 경계를 보존하는 스테레오 정합 방법을 제안한다. 초기 시차 지도 추정을 위해 비용 계산은 색상(CIE Lab)과 경사도(Gradient)를 결합하여 이용하였고, 두 번의 비용 결합 함수를 적용 하여 시차 지도를 추정 하였다. 화소 불일치 영역을 검출하기 위해 왼쪽/오른쪽 교차 검사를 수행 하였다. 두 픽셀 위치에서의 차이가 1보다 크면 폐색 영역이거나 잘못된 매칭으로 판단하고 왼쪽 시차 지도에 표시 하였다. 초기 시차 지도에서 깊이 불연속성으로 인한 에러값을 구별하기 위해 Mean-shift segmentation을 사용하여 신뢰 지도를 구하고 초기 시차 지도 영상에서의 에러값을 줄이기 위해 신뢰 지도 결과를 이용하여 시차 지도 조정을 수행한다. 실험 결과 제안하는 방법이 기존의 다른 방법들과 비교하여 비교적 높은 정확도를 보이는 시차 지도를 생성 하는 것을 보였다.

• 정보처리학회논문지D
• /
• 제9D권4호
• /
• pp.561-570
• /
• 2002

본 논문에서는 실체화된 공간뷰의 일관성 유지를 위하여 뷰 유도관련성을 이용한 두 가지 방법인 값 복사 실체화 방법과 식별자 유지 실체화 방법에 대하여 실험 평가한다. 이 실험 결과, 뷰 유도관련성을 이용한 점진적 변경 방법을 값 복사 실체화 방법과 식별자 유지 실체화 방법과 비교할 때, 공간뷰 객체에 대한 변경 시간이 거의 차이가 나지 않는다. 그리고 공간뷰에 대한 질의 수행 실험 결과, 값 복사 실체화가 식별자 유지 실체화보다 질의 수행 시간이 훨씬 빠르다. 결론적으로 실체화와 점진적 변경에 따른 성능 평가를 고려해 볼 때, 전체적으로 식별자 유지 실체화보다 값 복사 실체화를 기반으로 뷰 유도관련성을 이용한 점진적 변경 방법이 가장 바람직하다.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2006년도 하계종합학술대회
• /
• pp.211-212
• /
• 2006

This paper represents a Doherty amplifier with analog predistorter to improve the linearity of the Doherty amplifier while preserving the high efficiency. A $3^{rd}$-order predistorter cancels $5^{th}$-order intermodulation (IM5) as well as $3^{rd}$-order intermodulation (IM3) components by their same phase difference in the predistorter and Doherty amplifier. This is accomplished by independently controlling their phase by using the phase-controlled error generator in the predistorter. For experimental verification, a $3^{rd}$-order predistorter has been implemented and tested in a 180-W Doherty amplifier at the wide-band code division multiple access (WCDMA) band. The measured results show good performance with the predistortion Doherty amplifier.

• 대한수학회지
• /
• 제59권6호
• /
• pp.1067-1082
• /
• 2022

This paper presents a new optimal three-step eighth-order family of iterative methods for finding multiple roots of nonlinear equations. Different from the all existing optimal methods of the eighth-order, the new iterative scheme is constructed using one function and three derivative evaluations per iteration, preserving the efficiency and optimality in the sense of Kung-Traub's conjecture. Theoretical results are verified through several standard numerical test examples. The basins of attraction for several polynomials are also given to illustrate the dynamical behaviour and the obtained results show better stability compared to the recently developed optimal methods.

• 시큐리티연구
• /
• 제6호
• /
• pp.167-193
• /
• 2003

Korean social structure is changing by leaps and bounds caused by industrialization, urbanization and information. Because of this, the sense of value, and moral consciousness of Korean people have been edteriorating and all kinds of social evils have been increasing also. However, the police who ought to be in charge of public well-being, security, social order are not playing their role on account of bad working conditions, and lack of budget. For this reason, individuals are desirous of preserving their security and lives at their cost. Private security has emerged at this background.

• 대한수학회보
• /
• 제47권3호
• /
• pp.633-643
• /
• 2010

In this paper, the concept of maximal ideals relative to a filter on posets is introduced and examined. An intrinsic characterization of distributive lattices is obtained. In addition, we also give a characterization of pseudo primes in semicontinuous lattices and a characterization of semicontinuous lattices. Functions of semicontinuous lattices which are order preserving and semicontinuous are studied. A new concept of semiarithmetic lattices is introduced and examined.