• 대한산업공학회지
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• 제28권3호
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• pp.331-343
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• 2002

This paper proposes a fuzzy rule-based model as a means to build usability models between emotional satisfaction and design variables of consumer products. Based on a subtractive clustering algorithm, this model obtains partially overlapping rules from existing data and builds multiple local models each of which has a form of a linear regression equation. The best subset procedure and cross validation technique are used to select appropriate input variables. The proposed technique was applied to the modeling of luxuriousness, balance, and attractiveness of office chairs. For comparison, regression models were built on the same data in two different ways; one using only potentially important variables selected by the design experts, and the other using all the design variables available. The results showed that the fuzzy rule-based model had a great benefit in terms of the number of variables included in the model. They also turned out to be adequate for predicting the usability of a new product. Better yet, the information on the product classes and their satisfaction levels can be obtained by interpreting the rules. The models, when combined with the information from the regression models, are expected to help the designers gain valuable insights in designing a new product.

• The Journal of the Acoustical Society of Korea
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• 제26권2E호
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• pp.39-43
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• 2007

Music summarization refers to a technique which automatically extracts the most important and representative segments in music content. In this paper, we propose and evaluate a technique which provides the repeated part in music content as music summary. For extracting a repeated segment in music content, the proposed algorithm uses the weighted sum of similarity measures based on multi-level vector quantization for fixed-length summary or optimal-length summary. For similarity measures, count-based similarity measure and distance-based similarity measure are proposed. The number of the same codeword and the Mahalanobis distance of features which have same codeword at the same position in segments are used for count-based and distance-based similarity measure, respectively. Fixed-length music summary is evaluated by measuring the overlapping ratio between hand-made repeated parts and automatically generated ones. Optimal-length music summary is evaluated by calculating how much automatically generated music summary includes repeated parts of the music content. From experiments we observed that optimal-length summary could capture the repeated parts in music content more effectively in terms of summary length than fixed-length summary.

• 대한조선학회논문집
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• 제47권5호
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• pp.681-688
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• 2010

During certification of freefall lifeboats, it is necessary to estimate the injury potential of the impact loads exerted on the occupants during water entry. This paper focused on the numerical simulation to predict the acceleration response during the impact of freefall lifeboats on the water using FSI(Fluid-Structure Interaction) analysis technique of LS-DYNA code. FSI problems could be conveniently simulated by the overlapping capability using Arbitrary Lagrangian Eulerian(ALE) formulation and Euler-Lagrange coupling algorithm of LS-DYNA code. Through this study, it could be found that simulation results were in relatively good agreement with experimental ones in the acceleration peak values, and that the loading conditions were very sensitive to the acceleration responses by the experimental and simulation results.

• 대한임베디드공학회논문지
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• 제17권4호
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• pp.217-228
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• 2022

Currently, there are increasing demands for applying deep neural networks (DNNs) in the embedded domain such as classification and object detection. The DNN processing in embedded domain often requires custom hardware such as NPU for acceleration due to the constraints in power, performance, and area. Processing DNN models requires a large amount of data, and its seamless transfer to NPU is crucial for performance. In this paper, we developed a cycle-accurate NPU simulator to evaluate diverse NPU microarchitectures. In addition, we propose a novel technique for reducing the number of memory accesses when processing convolutional layers in convolutional neural networks (CNNs) on the NPU. The main idea is to reuse data with memory interleaving, which recycles the overlapping data between previous and current input windows. Data memory interleaving makes it possible to quickly read consecutive data in unaligned locations. We implemented the proposed technique to the cycle-accurate NPU simulator and measured the performance with LeNet-5, VGGNet-16, and ResNet-50. The experiment shows up to 2.08x speedup in processing one convolutional layer, compared to the baseline.

• Nuclear Engineering and Technology
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• 제55권12호
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• pp.4350-4356
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• 2023

Radiation detection systems working at high count rates suffer from the overlapping of their output electric pulses, known as pulse pile-up phenomenon, resulting in spectrum distortion and degradation of the energy resolution. Pulse tail extrapolation is a pile-up correction method which tries to restore the shifted baseline of a piled-up pulse by extrapolating the overlapped part of its preceding pulse. This needs a mathematical model which is almost always nonlinear, fitted usually by a nonlinear least squares (NLS) technique. NLS is an iterative, potentially time-consuming method. The main idea of the present study is to replace the NLS technique by an integration-based non-iterative method (NIM) for pulse tail extrapolation by an exponential model. The idea of linear extrapolation, as another non-iterative method, is also investigated. Analysis of experimental data of a NaI(Tl) radiation detector shows that the proposed non-iterative method is able to provide a corrected spectrum quite similar with the NLS method, with a dramatically reduced computation time and complexity of the algorithm. The linear extrapolation approach suffers from a poor energy resolution and throughput rate in comparison with NIM and NLS techniques, but provides the shortest computation time.

• 한국콘텐츠학회논문지
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• 제8권10호
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• pp.54-63
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• 2008

모바일 환경에서 컴퓨터의 성능 향상으로 멀티미디어 플레이어에 대한 사용자 요구로 하나의 동영상 재생기(Media Player)에서 여러 개의 동영상을 동시에 실행시킬 수 있는 복수 동영상 재생기가 일반화 것으로 본다. 현재로는 단일 동영상 재생에서 사용한 방법을 그대로 사용한 복수 동영상 재생을 지원하는 제품이 나왔으나, 그로 인한 문제점은 해결하지 못하고 있다. 본 논문에서는 단일 동영상 재생에서 사용되어지는 방법들을 복수 동영상의 재생 시에 적용할 경우에 생기는 문제점들 즉, 복수 동영상 재생시의 깜빡임 현상, 재생 우선순위 처리 그리고 반투명 처리 문제와 여러 개의 동영상을 재생할 경우에 가장 큰 문제점으로 공간 연출 지원이 이루어지지 않는다는 점을 인식하고, 오버랩핑(overlapping)과 오버레이 (overlay)기법을 사용하는 복수 동영상의 공간 재생기를 설계 및 구현하였다.

• 분석과학
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• 제7권1호
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• pp.25-31
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• 1994

정지상과 이동상에 대하여 선택성의 차이가 크지 않은 알킬페놀류에 대한 2차 화학평형이론을 적용하여 분리도에 미치는 pH 영향을 연구하였다. 이동상으로는 물-아세토니트릴을 사용하였으며, pH는 탄산나트륨 완충 용액으로 조절하였다. 인접한 봉우리간의 선택성을 최대로 하는 pH 값은 $k^{\prime}_{HA}/k^{\prime}_{A-}$와 평균 해리상수값(${\Delta}pK$)으로부터 구하였으며, 이 방법에 의해 결정된 최적 pH는 11.18이었다. 선택성의 효과를 최대로 얻기 위하여 pH와 용매의 선택성을 동시에 고려하였다. 결정된 최적의 pH 조건하에서 메탄올, 아세토니트릴, 테트라히드로퓨란, 물의 4성분 혼합 용매 시스템을 이용하였고, 통계적인 심플렉스 방법인 overlapping resolution maps(ORM)을 사용하여 최적 용매 조성을 결정하였다. 이 방법에 의하여 결정된 최적 용매 조성비는 MeOH : ACN : THF = 14.4 : 81.8 : 2.8이었다.

• 한국생활과학회지
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• 제15권6호
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• pp.1073-1081
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• 2006

The development of foundation garment pattern on the typical adult women's body was carried out. By means of the flatted body surface shell, the foundation garment pattern was developed. And its fitting test also performed. The results of this study can be summarized as follows; 1. The investigated Foundation basic pattern was made by the allowing the maximum bust size without any surplus since it was based on the tight-fitted model drawing technique. The investigated the completed pattern was designed in three parts of front and back body, including bust. 2. The result showed by overlapping the torso basic pattern foundation and body surface development selected from body almost the same except for the shift of dart position. 3. The result by overlapping basic pattern 3 existing basic patterns. On the basis of top-bust line showed that the setting up the volume of dart of bust and its waist affect the appearance of model. Especially, it was found that the above result was related to the bust and under bust line. 4. The result of the wearing test of 3 existing basic patterns and basic pattern of this study revealed that the mean values of whole items were higher than average in type P and type E. The fitting & position of under-bust line and extent of wrapping bust showed the high points in the current study and type of P. The result of evaluating the whole appearance in three points(front, side, back) showed different according to the every basic foundation garment pattern.

• 한국산학기술학회논문지
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• 제13권9호
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• pp.4152-4158
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• 2012

스테레오 X-선 검색장치는 기존의 대상물의 단면 정보만을 제공하는 검색 시스템보다 대상체에 대한 추가적인 정보를 제공하여 검색 효율을 높이기 위해 고안되었다. 이를 위하여 선행연구를 통해 스테레오 X-선 검색장치를 개발하고 기하학적 구조개선, 단일 오브젝트에 대한 윤곽선 정합 및 볼륨기반 형상복원 연구 등을 수행하였다. 본 논문에서는 선행 연구를 통해 개발된 스테레오 X-선 검색장치를 개선하여 정밀한 제어를 통해 두 개의 중첩 대상물을 스캔하여 대상체의 외형분리 복원을 위한 연구를 수행하였다. 중첩된 두 종의 대상체에 대한 외형정보를 분리 복원하기 위하여 벡터정보의 거리값을 계산하여 내 외부 복셀을 분리하고 중첩 부분에 대한 제거는 Z축을 기준으로 임계치를 두어 외형정보를 복원하기 위한 연구를 진행하였다. 본 연구의 결과는 3차원 스테레오 X-선 검색장치에 대한 스캔영상의 형상복원 알고리즘 개선을 통해 제한된 스캔환경에서 집적화된 대상체의 검색을 가능하도록 할 것이다.

• 한국정보과학회논문지:소프트웨어및응용
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• 제36권10호
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• pp.861-873
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• 2009

정보 검색에서 원하는 정보를 얻지 못하는 원인은 다양하다. 그 중에서도 표기의 다양성은 검색 시 불일치로 인한 정보 누락을 발생시키는 원인이 된다. 본 논문은 이러한 불일치에 의한 정보 누락을 최소화하기 위하여 검색 대체어 후보를 자동 생성하는 방법을 제안한다. 본 연구에서 제안하는 대체어 후보 자동 생성 방법은 문장 내에서 함께 쓰이는 단어들이 비슷한 두 단어는 서로 비슷한 의미를 지닐 것이다라는 직관적 가설을 전제로 한다. 이와 같은 가설을 기반으로 하여 본 연구에서는 분류별 집중도, 신뢰도를 이용한 연관단어 뭉치, 연관단어 뭉치 간 코사인 유사도 및 신뢰도를 이용한 필터링 기법 등을 이용한 대체어 후보 자동 생성 방법을 제안한다. 본 연구에서 제안한 대체어 후보 자동 생성 방법의 성능은 대체어 유형별로 작성된 평가지표를 이용하여 정확도 및 재현율을 측정함으로써 평가되었으며, 제안 방법이 context window overlapping을 이용한 대체어 추출 방법보다 더 우수한 것으로 나타났다.