• 정보처리학회논문지C
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• 제9C권1호
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• pp.135-140
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• 2002

효율적인 QoS 라우팅을 위하여 각각의 요구에 대한 제한조건을 충족시키는 것은 물론, 테 네트워크 자원의 최적화에 대해서도 고려해야할 필요가 있다. 본 논문에서는 QoS 라우팅의 on-demand 방식과 precomputation 방식의 경로계산에서 자원 비용 산정 방식을 제안하여 전체 네트워크 자원의 퇴적 사용과 네트워크 자원의 부하 균등을 가능하게 하였다. 또한 도메인으로 분할된 대규모 네트워크의 QoS 라우팅에서 transit traffic을 위한 경로를 precomputation 방식으로 설정하고, 이들 경로들의 예약 가능성을 높이기 위해 자원 예약 측면에서 가장 좋은 K개의 경로들을 부하균등을 고려하여 선정하는 방안을 제안하였다. 그리고 동일한 자원 비용 산정 방식을 transit traffic과 intra traffic에 모두 적용하여 도메인간 라우팅(inter-domain routing)과 도메인내 라우팅(inter-domain routing)을 무리 없이 연계하면서 transit traffic을 우선으로 하는 방식을 제안하였다. 귿으로 본 논문에서 제안된 비용 산정 방식은 기존의 QoS 라우팅 알고리즘 자체를 변형시키지 않으면서, 그들의 비용 요소만을 대체하여 쉽게 사용되어질 수 있는 장점이 있다.

• 대한수학교육학회지:학교수학
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• 제9권3호
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• pp.427-445
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• 2007

이 논문은 7학년 학생의 곱셈추론과 관련된 분수추론을 연구한 사례연구이다. 이 논문은 또한 교수실험방법론에 의해 거둬진 질적 자료를 domain analysis와 taxonomic analysis라는 질적 분석법에 따라 분석함으로써 특정 질적 분석법들의 실제 적용사례를 자세히 보여준다. 자료 분석을 통해 세 가지 이슈가 부각되었다: 분수에 대한 시각 (조작으로써 대 결과물로써), 단위 문제, 대분수와 가분수의 관계이다. 그러한 이슈들은 첫째, 각 이슈들이 곱셈추론의 발달에 중요하며, 둘째 그 이슈들 사이의 관계가 분수추론을 통한 곱셈추론의 한 방법을 제시해 준다는 점에서 교육적인 의미를 갖는다.

• 한국IT서비스학회:학술대회논문집
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• 한국IT서비스학회 2002년도 추계학술대회
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• pp.425-430
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• 2002

Over the years, several different approaches have been proposed to enhance the practice of software reuse. These approaches vary in reuse abstraction levels or application domains they focus on. However, it seems that they do not adequately meet the needs of software designers in planning and managing reuse. One reason may be the lack of conceptually well-established framework supporting work domain analysis and modeling. As a new viable solution to this problem, Sutcliffe and his colleagues developed Domain Theory , which is introduced in this paper. Utilizing multidisciplinary perspective, such as cognitive psychology, management science, human-computer interaction, and software engineering. it provides a schematic framework that defines a comprehensive library of generic and reusable models of domain knowledge in terms of generic tasks and meta-domains. It also provides useful methods and guidelines for software reuse, emphasizing the concept of abstraction process in a designer s mind. This paper firstly gives a brief overview of fundamentals of software reuse. Next, it explains the foundation of domain theory and discusses its applicability to software reuse. In particular, the taxonomy of meta-domains and the types of generic tasks are described in more detail. Finally, the future research framework, which primarily addresses the problem of how to apply the domain theory to various work domains, is proposed.

• 한국결정학회지
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• 제11권1호
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• pp.34-41
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• 2000

The group-theoretical approach analyzing the domain structure and the domain wall orientations of the ferroelastic crystal was introduced. These theoretical results were investigated by comparing them with the experimental results of several ferroelastic crystals, CsPbCl₃, Pb₃(PO₄)₂, and LiCsSO₄, which were grown by the Czochralski and solution methods, respectively. both results were agreed well and also consistent with those of previous works such s the strain method and the geometrical consideration. The group-theoretical approach showed that the ferroelastic domain walls must be the crystallographical prominent planes with fixed indices and classified by the symmetry elements characterizing the permissible domain walls. So the group-theoretical approach could be suggested as a new method for analyzing the structure of the ferroelastic domain and domain walls.

• 대한수학회보
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• 제46권5호
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• pp.823-833
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• 2009

It is well-known that if a convex hyperbolic polygon is constructed as a fundamental domain for a subgroup of the modular group, then its translates by the group elements form a locally finite tessellation and its side-pairing transformations form a system of generators for the group. Such hyperbolically convex polygons can be obtained by using Dirichlet's and Ford's polygon constructions. Another method of obtaining a fundamental domain for subgroups of the modular group is through the use of a right coset decomposition and we call such domains standard fundamental domains. In this paper we give subgroups of the modular group which do not have hyperbolically convex standard fundamental domain containing only inequivalent cusps.

• 정보처리학회논문지C
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• 제9C권5호
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• pp.671-678
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• 2002

본 논문에서는 대규모 네트워크에서의 부하분산을 고려한 계층적 도메인간 QoS 라우팅을 제안하였다. 이를 위해 계층적 라우팅에서의 비용 산정 방식을 선계산 방식의 경로계산에서 제안하였고 선계산된 다중경로들 중에서 경로를 선택하는 방안을 제안하였다. 제안한 비용산정 방식은 도메인으로 분할된 대규모 네트워크의 QoS 라우팅에서 선계산 방식으로 경로를 설정하고, 이들 경로들의 예약 가능성을 높이기 위해 자원 예약 측면에서 가장 좋은 K개의 경로들을 부하분산을 고려하여 계산한다. 또한 이러한 다중 경로들 중에서 비용산정에 근거한 경로선택확률에 따라 경로를 선택하는 방안을 제안하였다. 그리고 제안한 QoS 라우팅 방식을 transit traffic과 intra traffic에 모두 적용하여 도메인간 라우팅과 도메인내 라우팅을 무리 없이 연계하면서 transit traffic을 우선으로 하는 방식을 제안하였다. 따라서 본 논문에서 제안한 부하분산 QoS 라우팅은 전체 네트워크 자원의 최적사용 뿐만 아니라 자원의 부하 분산을 가능하게 할 것으로 기대된다.

• 대한조선학회지
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• 제24권4호
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• pp.9-18
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• 1987

The hydrodynamic radiation forces acting on a ship travelling in waves have been conventionally treated by strip theories or by direct three dimensional approaches, most of which have been formulated in frequency domain. If the forward speed of a ship varies with time, or if its path is not a straight line, conventional frequency domain analysis can no more be used, and for these cases time domain analysis may be used. In this paper, formulations are made in time domain with applications to some problems the results of which are known in frequency domain. And the results of both domains are compared to show the characteristics and validity of time domain solutions. The radiation forces acting on a three dimensional body within the framework of a linear theory. If the linearity of entire system is assumed, radiation forces due to arbitrary ship motions can be expressed by the convolution integral of the arbitrary motion velocity and the so called impulse response function. Numerical calculations are done for some bodies of simple shapes and Series-60[$C_B=0.7$] ship model. For all cases, integral equation techniques with transient Green's function are used, and velocity or acceleration potentials are obtained as the solution of the integral equations. In liner systems, time domain solutions are related with frequency domain solutions by Fourier transform. Therefore time domain solutions are Fourier transformed by suitable relations and the results are compared with various frequency domain solutions, which show good agreements.

• 한국생활과학회지
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• 제8권1호
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• pp.1-14
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• 1999

The purpose of this study was to measure perceiving extent on father and mother's authority - domain perceived by child and the some materials for bringing up authority - domain in according to the sex and development level of child. The study subjects were children of 3rd elementary schools and 3rd middle schools at Cheong - ju city Chungcheongbuk - do and duration for investigation was from Sept. 24, '97 to Sept. 28, '97. The measuring sample was "Parents' Authority Index" by Kim, Kyeong - hee(1990). The Data were analyzed by descriptive analysis, t - test and ANOVA using the SPSSWIN program. The conclusion of this study were as follows; 1. The perceptive extent regarding parents' authorities has shown very voluntary differences in identity authority. It has shown voluntary differences ligitimacy authority and competency authority as well. 2. In the father's authority - domain based on the child's sex, girl group recognized higher than boy group for the ligitmacy authority as a elementary school students. 3. In the father's authority - domain aspect based on child's developing level, for the ligitmacy authority boy group showed most voluntary difference. In the mother's authority based on child's developing level, all of boy and girl group recognized highly exchange authority with a voluntary difference. 4. In concering the correlation of each authority - domains to father and mother percevied by children, it was shown the highest within identical realm.

• Journal of information and communication convergence engineering
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• 제8권3호
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• pp.312-316
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• 2010

Conformal mapping has been a familiar tool of science and engineering for generations. The methods of numerical mapping are usually classified into those which construct the map from standard domain such as the unit disk onto the 'problem domain', and those which construct the map in the reverse direction. We treat numerical conformal mapping from the unit disk onto the Jordan regions as the problem domain in this paper. The traditional standard methods of this type are based on Theodorsen integral equation. Wegmann's method is well known as a Newton-like efficient one for solving Theodorsen equation. An improved method for convergence by applying low frequency pass filter to the Wegmann's method was proposed. In this paper we propose an effective algorithm for numerical conformal mapping based on the improved method. This algorithm is able to determine the discrete numbers and initial values automatically in accordance with the given region and the required accuracy. This results come from analyzing the shape of given domain as seen in the Fourier Transform.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 하계종합학술대회 논문집
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• pp.69-72
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• 1999

In this paper, an efficient time domain equalization algorithm for discrete wavelet multitone(DWMT) data transmission is developed. In this algorithm, the time domain equalizer(TEQ) consists of two stages, i.e., the channel impulse response shortening equalizer(TEQ-S) in the first stage and the channel frequency flattening equalizer(TEQ-F) in the second stage. TEQ-S reduces the length of transmission channel impulse response to decrease intersymbol interference(ISI) followed by TEQ-F that enhances the channel frequency response characteristics to the level of an ideal channel, hence diminishes the bit error rate. TEQ-S is implemented using the least-squares(LS) method, while TEQ-F is designed by using the least mean-square(LMS) algorithm. Since DWMT system also requires of the frequency domain equalizer in order to further reduce ICI and ISI the hardware complexity is an another concern. However, by adopting an well designed and trained TEQ, the hardware complexity of the whole DWMT system can be greatly reduced.