• 한국컴퓨터정보학회논문지
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• 제14권10호
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• pp.31-41
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• 2009

시맨틱 웹에서는 메타데이터와 온톨로지를 이용해 정보 리소스의 개념을 정의하고 의미적 연관성을 표현함으로써 지능적인 정보 검색과 자동화된 웹 서비스의 제공이 가능하다. 이러한 시맨틱 웹의 핵심적인 기능을 구현하기 위해서는 온톨로지와 메타데이터와 같은 시맨틱 웹 데이터를 효율적으로 관리하는 것이 무엇보다 중요하다. 따라서 본 논문에서는 시맨틱 웹 데이터의 의미와 구조적인 특성을 고려하여 보다 정확한 질의 결과의 검색과 효율적인 질의 처리를 지원할 수 있는 인덱스 구조를 제안한다. 특히 시맨틱 웹 데이터의 의미와 구조적인 특성을 그대로 표현하기 위해 그래프 데이터 모델을 이용하고 다양한 질의 형태를 그래프 모델 기반의 경로식으로 처리한다. 본 논문에서 제안한 인덱스는 1차적으로 추출 가능한 구조적 경로 정보는 물론 온톨로지를 이용한 추론을 통해 2차적으로 추출 가능한 구조적 경로 정보에 대한 질의를 처리 대상으로 하여 기존연구들과 차별화하며 시맨틱 웹의 개념을 온전히 반영하는 것을 목표로 한다. 또한 실험적 평가를 통해 본 논문에서 제안한 인덱스 구조가 정확성과 효율성 측면에서 우수하며 시맨틱 웹의 다양한 애플리케이션 개발에 적용 가능함을 보인다.

• 대한전자공학회논문지SD
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• 제41권2호
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• pp.67-75
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• 2004

본 논문은 인덕턴스 성분을 포함한 단일 도선 및 트리 구조 RLC 연결선의 버퍼 삽입 방법을 제시한다. 이를 위해 먼저 CMOS 버퍼가 구동하는 단일 RLC 도선에 대한 시간 지연의 대수식을 제시한다. 이 수식은 현재의 서브마이크로미터 공정을 위한 n-th power law 기반에서 유도되었으며, 다양한 RLC 부하를 가지고 실험해 본 결과, 실제 SPICE 시뮬레이션 결과에 비해 최대 9％ 오차를 갖는 것으로 나타났다. 본 논문은 이 지연 시간 수식을 바탕으로 단일 도선 RLC 연결선을 여러 개로 나누는 버퍼 삽입에 관한 수식과 RLC 트리 연결선의 시간 지연을 최적화하기 위해 삽입될 버퍼의 사이즈를 결정하는 알고리듬을 제시한다. 제시된 버퍼 삽입 알고리듬은 0.25㎛ CMOS 공정의 트리 연결선에 적용하였으며, HSPICE 결과를 이용하여 정확도를 검증하였다.

• Tribology and Lubricants
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• 제30권1호
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• pp.15-20
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• 2014

A more accurate expression for effective viscosity is obtained using a linear regression of the data from Fukui-Kaneko's model, which are obtained through numerical calculations based on the linearized Boltzmann equation. Veijola and Turowski's expression is adopted as a base function for effective viscosity. The four coefficients in that equation are optimized, and sensitivity analysis is conducted for these coefficients. The results show that the coefficient for the first-order Knudsen number is the most accurate, whereas the coefficient in the exponential of the Knudsen number is the least accurate compared with Fukui-Kaneko's results. The expression for effective viscosity is accurate within 0.02% rms of Fukui-Kaneko's results for the inverse Knudsen numbers from 0.01 to 100 and surface accommodation coefficients ranging from 0.7 to 1.

• 한국의류학회지
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• 제32권11호
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• pp.1704-1714
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• 2008

The purpose of this research was to investigate the relationships among clothing benefits sought, brand attachment, and brand loyalty. The subjects were 559 male and female consumers who were residents in Seoul. The data were analyzed by factor analysis, multiple regression, and path analysis. The results showed that there were seven clothing benefits sought: ideal figure/impression improvement, individuality, brand, fashion, comfort, conformity, and sex appeal. Brand attachment motives had two factors of brand personality/individuality expression and conformity/status elevation. Brand attachment consisted of love/friendliness and passion. Statistical analyses showed that there were significant relationships among clothing benefits sought, brand attachment, and brand loyalty. There were significant effects of clothing benefits sought factors on brand attachment motives. The consumers who sought benefits of ideal figure/impression improvement, individuality, and sex appeal had a brand personality/individuality expression motive. In the meanwhile the consumers who sought benefits of brand, fashion, comfort, conformity, and sex appeal had a conformity/status elevation motive. There were also significant effects of brand attachment motives on brand attachment. The consumers who had a brand personality/individuality expression motive felt love/friendliness and passion for their brands.

• 한국ITS학회 논문지
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• 제12권3호
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• pp.87-95
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• 2013

본 논문에서는 다중 홉 시스템에서 하나의 홉에 대한 채널 정보만을 이용하는 효율적인 부분 중계 노드 선택(efficient partial relay selection, EPRS) 기법에 대한 아웃티지 확률을 레일레이 페이딩 채널에서 분석한다. 특히, 디코딩 후 전달 중계 기반의 EPRS 기법에 대한 정확한 아웃티지 확률의 식을 유도한다. 또한, 다중 홉 시스템에서 EPRS 기법의 실효성을 확인하기 위하여, 임의의 중계 경로에서 종단간 신호 대 잡음비와 각 홉의 신호 대 잡음비의 상관관계를 분석한다. 그리고, 수치적 결과를 통해 EPRS 기법과 모든 채널 정보를 이용하는 중계 노드 선택 기법의 아웃티지 성능을 비교한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권1호
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• pp.253-271
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• 2017

In this paper, considering that perfect channel state information (CSI) is hard to achieve in practice, the downlink capacity of distributed antenna systems (DAS) with imperfect CSI and multiple receive antennas is investigated over composite Rayleigh fading channel. According to the performance analysis, using the numerical calculation, the probability density function (PDF) of the effective output SNR is derived. With this PDF, accurate closed-form expressions of ergodic capacity and outage probability of DAS with imperfect CSI are, respectively, obtained, and they include the ones under perfect CSI as special cases. Besides, the outage capacity of DAS in the presence of imperfect CSI is also derived, and a Newton's method based practical iterative algorithm is proposed to find the accurate outage capacity. By utilizing the Gaussian distribution approximation, another approximate closed-form expression of outage capacity is also derived, and it may simplify the calculation of accurate outage capacity. These theoretical expressions can provide good performance evaluation for downlink DAS for both perfect and imperfect CSI. Simulation results verify the effectiveness of the theoretical analysis, and the system capacity can be improved by increasing the receive antennas, and decreasing the estimation error or path loss. Moreover, the system can tolerate the estimation error variance up to about 0.01 with a slight degradation in the capacity.

• 한국산업정보학회논문지
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• 제8권1호
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• pp.112-120
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• 2003

본 논문에서는 웹 환경에서 객체 데이타베이스를 위한 그래픽 질의어인 OGQL(Odysseus Graphical Query language)의 설계 및 구현에 대하여 논하였다. OGQL은 객체 질의어에 포함된 객체 개념을 간단한 시각적 도구로 표현함으로써 사용자에게 편리한 질의 환경을 제공한다. 특히, OGQL에서는 클래스 계층구조(class composition hierarchy) 상에서 질의 조건을 표시하는데 널리 사용되는 순환(cycle)을 가진 경로식(path expression)을 그래프 형태의 직관적인 표현 방식으로 시각화하고 있다. 순환을 가진 질의의 시각적 표현은 복잡한 이유로 대부분의 그래픽 질의에서 다루지 않고 있다. 또한, 클래스 간의 상속(inheritance)과 같은 객체 질의어의 고유 특성도 시각적으로 표현하고 있다. OGQL은 JDBC를 이용한 자바응용 프로그램이므로 웹 환경에서 원격지 데이터베이스에 접근이 용이하고, 컴퓨터 시스템 플랫폼에 독립적이라는 장점도 가진다.

• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.391-396
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• 2013

As the construction environment has been changing all the times, the techniques for managing the construction projects have been improved accordingly. The schedule management technique, one of the construction management tools, has been evolved as well in order to be adaptable to new construction environment. Most of newly proposed scheduling techniques have been based on the Critical Path Method (CPM) that was proposed in 1956. The CPM is classified into two categories, Arrow Diagramming Method (ADM) and Precedence Diagramming Method (PDM). ADM is so good in the visual format but it cannot express the overlapping relationships between two consecutive activities. On the other hand, PDM can express the overlapping relationships but it is unsatisfactory in the visual format. Recently, as the construction environment becomes more complex and the role of schedule management becomes more and more important, the overlapping expression becomes one of critical factors for scheduling as well. Most of construction project participants prefer more comfortable visual format, however, the scheduling software based on the PDM cannot satisfy their basic requirement. Beeliner, new scheduling software based on the Beeline Diagramming Method (BDM) that was proposed in 2010, was developed in 2012, it can express more flexible overlapping relationships and has superior visual format as well. This paper presents major features and applications of Beeliner, and makes construction professionals understand new scheduling concept and its applications.

• 대한건축학회논문집:계획계
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• 제36권5호
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• pp.3-10
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• 2020

According to Carol Duncan, the museum can be studied in the aspect of space and object from viewer experience. The paradigm of modern museums is shifting away from the object toward the human. The modern museum begins to have the diversity activities and the experience by the body. The purpose of this study is to analyze methods of Carlo Scarpa's museum works. An Italian architect, Carlo Scarpa had characterized montage architecture through fragments and isolations. This study reviews the works of Carlo Scarpa's museum focused on Museo di Castelvecchio. Carlo Scarpa had left the existing materials and coated it with new materials intentionally. This method makes the layer and it exposes the historical times. The layer is a reinterpreting technic of Venetian architecture. The perceptive experience appears at the exhibition boundary through light, material, pattern, axis, and composition of elements. Through the analysis, the architecture of Carlo Scarpa's museum provides a walking path and the composition of exhibition objects with visual logics. It makes and show us the experience with combining images. Carlo Scarpa had tried to expose the past times in the architecture of museum with expression on the layers and to connect the body's movements with seeing and gazing. This expression makes possible the perceptual experience. It can be understood as the montage characteristic. Through this, Carlo Scarpa's museum makes us relationship with historical architecture. Carlo Scarpa had planned a exhibitional promenade in the architecture of museums. In this regard, this is the museography of Carlo Scarpa's museums that should be paid attention to modern times in historical architecture.

• 한국발생생물학회지:발생과생식
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• 제28권1호
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• pp.13-19
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• 2024

Ras-related (Rab) proteins, integral members of the monomeric G-protein family, play a pivotal role in regulating intracellular vesicular transport. These proteins contribute to male reproductive processes, specifically in acrosome formation, exocytosis, and sperm motility. Although a prior study indicated a correlation between Rab3A and sperm motility, including motion kinematic parameters such as mean dance, this association has only been explored within a limited sample size. Therefore, further verification is required to confirm the correlation between Rab3A and sperm motility parameters. In the present study, Rab3A expression, sperm motility, and motion kinematic parameters were analyzed in 150 boar spermatozoa. Additionally, correlations between Rab3A expression and sperm kinematic characteristics were evaluated statistically. The results revealed significant associations between Rab3A protein expression levels and various motion kinematic parameters. Specifically, Rab3A levels exhibited positive correlations with average path velocity (p<0.05), mean amplitude of lateral head displacement (p<0.05), and curvilinear velocity (p<0.01). Consequently, it is proposed that Rab3A protein plays a crucial role in male fertility through its correlation with sperm kinematic characteristics, making it a potential marker for sperm motility-related assessments.