• ETRI Journal
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• 제30권3호
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• pp.394-402
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• 2008

Domain analysis is the process of analyzing related software systems in a domain to find their common and variable parts. In the case of device drivers, they are highly suitable for domain analysis because device drivers of the same domain are implemented similarly for each device and each system that they support. Considering this characteristic, this paper introduces a new approach to the domain analysis of device drivers. Our method uses a code clone detection technique to extract similarity among device drivers of the same domain. To examine the applicability of our method, we investigated whole device drivers of a Linux source. Results showed that many reusable similar codes can be discerned by the code clone detection method. We also investigated if our method is applicable to other kernel sources. However, the results show that the code clone detection method is not useful for the domain analysis of all kernel sources. That is, the applicability of the code clone detection method to domain analysis is a peculiar feature of device drivers.

• 정보관리학회지
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• 제29권4호
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• pp.295-312
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• 2012

이 연구에서는 White가 제안한 자아 중심 인용 분석을 응용하여 연구 주제에 대한 다층적인 분석을 가능하게 해주는 자아 중심 주제 인용 분석 기법을 제안하였다. 시험적으로 폭소노미에 대한 연구문헌을 Web of Science 데이터베이스로부터 검색한 후 이에 대한 주제 인용 분석을 수행해보았다. 폭소노미 주제에 대한 자아 중심 인용 분석은 자아 문헌 집단 분석, 주제 인용 정체성 분석, 주제 인용 이미지 분석의 세 단계로 나뉘어 수행되었다. 분석 결과 이 연구에서 제안된 자아 중심 주제 인용 분석을 통해서 폭소노미 연구의 내부 지적 구조와 외부 지적 구조를 함께 파악하는 것이 가능함이 확인되었다.

• 한국문헌정보학회지
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• 제40권1호
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• pp.139-162
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• 2006

이 연구에서는 도메인분석에 대해서 이론적으로 고찰함으로써 문헌정보학적 관점에서의 지식이론과 문헌정보학의 이론적 틀을 제시함과 동시에 문헌정보학의 연구방법론에 일반원칙을 제시하였다. 도메인분석에서 핵심적인 개념은 도메인을 구성하는 주제지식과 그 지식을 공유하는 담론 커뮤니티라고 할 수 있다. 따라서 도메인의 정의를 제시하고 도메인을 존재론적. 인식론적. 사회학적 차원에서 살펴보았으며, 도메인분석에서 이용할 수 있는 11가지 연구방법을 제시하였다. 그리고 도메인분석이 문헌정보학에서 가지는 함의를 사회-인지적 관점과 실용적 사실주의의 입장에서 검토하였다.

• 한국CDE학회논문집
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• 제20권1호
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• pp.84-92
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• 2015

In this study, we describe a method to analysis dynamic behavior of an offshore wind turbine in the frequency domain and expected effects of the method. An offshore wind turbine, which is composed of platform, tower, nacelle, hubs, and blades, can be considered as multibody systems. In general, the dynamic analysis of multibody systems are carried out in the time domain, because the equations of motion derived based on the multibody dynamics are generally nonlinear differential equations. However, analyzing the dynamic behavior in time domain takes longer than in frequency domain. In this study, therefore, we describe how to analysis the system multibody systems in the frequency domain. For the frequency domain analysis, the non-linear differential equations are linearized using total derivative and Taylor series expansions, and then the linearized equations are solved in time domain. This method was applied to analysis of double pendulum system for the verification of its effectiveness, and the equations of motion for the offshore wind turbine was derived with assuming that the wind turbine is rigid multibody systems. Using this method, the dynamic behavior analysis of the offshore wind turbine can be expected to take less time.

• Current Optics and Photonics
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• 제2권3호
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• pp.250-260
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• 2018

A pressure wave created by the photoacoustic effect is affected by the medium and by laser parameters. The effect of these parameters on the generated pressure wave can be seen by solving the photoacoustic wave equation. These solutions which are examined in the time domain and the frequency domain should be considered by researchers in acoustic sensor design. In particular, frequency domain analysis contains significant information for designing the sensor. The most important part of this information is the determination of the operating frequency of the sensor. In this work, the laser parameters to excite the medium, and the acoustic signal parameters created by the medium are analyzed. For the first time, we have obtained solutions for situations which have no frequency domain solutions in the literature. The main focal point in this work is that the frequency domain solutions of the acoustic wave equation are performed and the effects of the frequency analysis of the related parameters are shown comparatively from the viewpoint of using them in acoustic sensor designs.

• Nonlinear Functional Analysis and Applications
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• 제27권4호
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• pp.921-925
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• 2022

In this paper, we completely describe the automorphism group of the bounded Kohn-Nirenberg domain in [5].

• 대한의용생체공학회:의공학회지
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• 제17권2호
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• pp.155-164
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• 1996

In the clinical environment, measurements of some characteristics of the skeletal muscle are currently used to assess the severity of a neuromuscular disease or in some cases to assist in making a diagnosis. But a quantitative method of evaluation has not yet been introduced satisfactorily. In this paper, the skeletal EMG(biceps muscle, masseter muscle) analysis has been processed both in the time and in the frequency domain by designing the digital signal processing system based on pentium PC and transputer (IMS 7805). The experiment have been performed in five normal subjects, and various parameters have been statistically tested and compare4 As a results, the effective parameters obtained for the evaluation of skeletal EMG electrical activity are turn analysis, MiTi, MiTa, IEMG, PDF in the time domain, and are mean frequency, median frequency, skewness, kurtosis, muscle fatigue slope in the frequency domain. The designed H/W and S/W in this study can be used effectively for the establishment of EMG data base and for clinical research.

• 지질공학
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• 제31권3호
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• pp.307-319
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• 2021

최근 드론 및 빅데이터, 인공지능 등 디지털 기술을 활용한 비탈면 연구를 수행하고 있으나 다소 미흡한 실정이며, 여전히 비탈면 붕괴 대비에 취약하다. 이러한 이유로 비탈면 붕괴에 효과적으로 대처하기 위해 디지털 기술을 활용한 비탈면 붕괴 예측 및 분석 연구에 대한 발전방향을 제시하는 것이 필연적이며, 이를 위해 비탈면 붕괴 예측 및 분석에 관한 이해가 선제되어야 한다. 본 연구는 비탈면 붕괴 예측 및 분석 연구의 지적구조를 규명하여 연구방향을 제시하기 위해 2016년 1월 1일부터 2020년 12월 31일까지의 5년간의 Web of Science 기반으로 문헌 데이터를 수집하고 이를 동시출현단어를 활용하여 분석하였다. 네트워크 분석을 통하여 세부 주제 영역을 밝히고, 키워드 간의 지적 관계를 시각화하여 관계, 중심성 분석을 통한 전역 및 지역 중심성이 높은 키워드를 도출하였다. 또한 군집분석을 실시하여 형성된 군집을 다차원축적지도에 표시하였으며, 각 키워드들 간의 상관관계에 따른 지적구조를 제시하였다. 이러한 연구의 결과는 비탈면 붕괴 분석 및 예측 연구의 지적구조를 밝히고, 향후 연구 방향을 찾는데 도움이 될 것으로 기대한다.

• 한국지진공학회논문집
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• 제20권6호
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• pp.379-389
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• 2016

This study intends to evaluate the conservativeness of the fixed-base analysis as compared to the soil-structure interaction (SSI) analysis for the seismically isolated model of a nuclear power plant in Korea. To that goal, the boundary reaction method (BRM), combining frequency-domain and time-domain analyses in a twofold process, is adopted for the SSI analysis considering the nonlinearity of the seismic base isolation. The program KIESSI-3D is used for computing the reaction forces in the frequency domain and the program MIDAS/Civil is applied for the nonlinear time-domain analysis. The BRM numerical model is verified by comparing the results of the frequency-domain analysis and time-domain analysis for the soil-structure system with an equivalent linear base isolation model. Moreover, the displacement response of the base isolation and the horizontal response at the top of the structure obtained by the nonlinear SSI analysis using BRM are compared with those obtained by the fixed-base analysis. The comparison reveals that the fixed-base analysis provides conservative peak deformation for the base isolation but is not particularly conservative in term of the floor response spectrum of the superstructure.

• Wind and Structures
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• 제17권2호
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• pp.227-244
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• 2013

Non-stationary extreme winds such as thunderstorm downbursts are responsible for many structural damages. This research presents a time domain approach for estimating along-wind load effects on tall buildings using multiple wind speed time history samples, which are simulated from evolutionary power spectra density (EPSD) functions of non-stationary wind fluctuations using the method developed by the authors' earlier research. The influence of transient wind loads on various responses including time-varying mean, root-mean-square value and peak factor is also studied. Furthermore, a simplified model is proposed to describe the non-stationary wind fluctuation as a uniformly modulated process with a modulation function following the time-varying mean. Finally, the probabilistic extreme response and peak factor are quantified based on the up-crossing theory of non-stationary process. As compared to the time domain response analysis using limited samples of wind record, usually one sample, the analysis using multiple samples presented in this study will provide more statistical information of responses. The time domain simulation also facilitates consideration of nonlinearities of structural and wind load characteristics over previous frequency domain analysis.