• 한국음향학회지
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• 제38권5호
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• pp.534-542
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• 2019

능동소나에서는 표적의 거리 도플러 정보를 탐지하기 위해 여러 가지 기법을 사용한다. 그중 압축 센싱을 적용한 기법은 기존의 방식보다 더욱 정밀한 탐지가 가능하며 우수한 성능을 나타낸다. 능동 소나의 거리 도플러 추정에 적용할 수 있는 압축 센싱 알고리즘은 여러 가지 있다. 압축 센싱 알고리즘 마다 계산 성능이 다르며 압축 센싱 알고리즘에 따라 신호 대 잡음비와 센싱 행렬의 코히런스가 거리 도플러 추정에 미치는 영향의 정도가 다르다. 본 논문은 능동 소나의 거리 도플러 추정을 위한 여러 가지 압축 센싱 알고리즘의 계산 성능과 정확도를 비교, 분석하였다. 여러 신호대 잡음비, 상호간섭성 값에 대한 OMP(Orthogonal Matching Pursuit), CoSaMP(Compressive Sampling Matching Pursuit), BPDN(CVX)(Basis Pursuit Denoising), LARS(Least Angle Regression) 알고리즘의 추정 성능을 확인하였으며, 상황에 따른 최적의 압축 센싱 알고리즘을 보인다.

• 한국의류학회지
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• 제27권6호
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• pp.601-611
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• 2003

The main objective of this study was to investigate the relationship between benefits segmentation and knitwear purchasing behavior of college female students. A questionnaire was developed to measure benefits segmentation, knit wear purchasing behavior. The questionnaire was administered to 505 college female students in Chonbuk and Chonnam. The data was analyzed using percentage, frequency, mean, factor analysis, cluster analysis and ANOVA, Duncan multiple range test. The results of the study were as follows: The college female students were classified into four subdivisions by the cluster analysis: recreation pursuit group, fashion pursuit group, individuality pursuit group, self-improvement pursuit group on the basis of pursuit benefit factors. The knitwear purchasing motives of consumers were significantly different according to pursuit benefit subdivision. The individuality pursuit group was the highest user of mass media fashion information sources. The fashion pursuit group used purchasing experience and advice of others less than other groups. Consumers' evaluation criteria of knitwear products were significantly different depending on pursuit benefit subdivision in design and coordination, goods traits, practicality, individual expression, and external criterion. The other groups used purchasing experience and advice of others more than the fashion pursuit group.

• 한국생활과학회지
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• 제19권1호
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• pp.127-136
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• 2010

This research subdivided the groups of baby clothes purchasers by consumer value factors in order to study clothing behavior by the value group of baby clothes purchasers and to examine differences in shopping propensity, pursuit benefits, evaluation criteria, and utilization of information sources depending on the value groups 1. A total of three factors - the pursuit of a stable life, the pursuit of achievement, and the pursuit of pleasure - were derived by conducting a factor analysis on the value dimensions of baby clothes purchasers. The value types of baby clothes purchasers were classified into three groups - the group of the pursuit of achievement, the group of the pursuit of stability and pleasure, and the passive group as the result of conducting cluster analysis on the basis of three types of personal value factors. 2. In the difference of shopping propensity by the value group, the group of the pursuit of achievement and the group of the pursuit of stability and pleasure were found to be the group having economical shopping propensity. In the difference of pursuit benefits by the value group, the passive group appeared to be the group in pursuit of fashion, and it could be seen that the group of the pursuit of achievement and the group of the pursuit of stability and pleasure were highly interested in the pursuit of individuality and practicality. 3. In the evaluation criteria of clothes by the value group of baby clothes purchasers, the group of the pursuit of achievement was found to consider physical criteria as important evaluation criteria, and the group of the pursuit of stability and pleasure was found to consider aesthetic criteria as important evaluation criteria. In the utilization of information sources by the value group of baby clothes purchasers, the passive group was found to be influenced most by market-oriented information sources.

• 한국음향학회지
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• 제36권4호
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• pp.285-291
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• 2017

두 개 수신기에 들어오는 신호 간의 시간 지연 값을 추정하기 위한 방법들이 연구되고 있다. 그중에서 채널 추정 기법을 기반으로 한 방법의 경우는 두 수신기의 입력 신호간의 상대적인 지연을 채널의 임펄스 응답처럼 추정하는 방법이다. 이 경우에는 해당 채널의 특성이 희소 채널의 특성을 가지고 있다. 기존의 방법들은 채널의 희소성을 이용하지 못하고 있는 방법이 대부분이다. 본 논문에서는 채널의 희소성을 이용하기 위하여 희소 신호 최적화 방법의 하나인 BPD(Basis Pursuit Denoising) 최적화 기법을 사용한 시간 지연 추정 방법을 제안한다. 제안한 방법을 기존의 일반 상호 상관(Generalized Cross Correlation, GCC) 방법과 적응 소유치 분해법 및 희소 신호 추정법의 일종인 RZA-LMS(Reweighted Zero-Attracting Least Mean Square)들과 비교하여, 백색 가우시안 신호원과 유색 신호원 및 해양 포유류 신호원에 대해서 비교 실험을 하였다. 그 결과 갑자기 추정성능이 열화되는 문턱 현상이 늦게 나타나거나 훨씬 줄어드는 것을 보였다.

• 한국의상디자인학회지
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• 제13권4호
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• pp.51-67
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• 2011

The purposes of this study were to segment male university students on the basis of benefit sought in clothing, and to investigate knitwear image preference and purchasing behaviors of each segmented market. The research method was a survey and subjects were 249 male university students in Daejeon and Chungnam province. The questionnaire consisted of measurement items for benefit sought in clothing, knitwear image preference, knitwear purchasing behaviors, and subject's demographic attributions. The data were analyzed by Cronbach's ${\alpha}$, factor analysis, cluster analysis, ${\chi}^2$ test, ANOVA and Scheffe test. The results were as follows. First, male university students were segmented into 6 consumer types (practicality pursuit, individuality pursuit, comport pursuit, brand pursuit, social status pursuit, and unconcern type) by benefit sought in clothing. Second, male university students generally preferred dandy image and causal image, however, brand pursuit type more preferred trendy image, and practicality pursuit type more preferred active image than other consumer types. Third, the segmented markets showed many differences on knitwear purchasing behaviors. On clothing selection criteria, practicality pursuit type considered resonable price as important, whereas brand pursuit type considered brand reputation. On fashion information source, individuality pursuit type considered store display and other people's clothing, while unconcern type considered advice from friend and family. On main purchasing place, individuality pursuit type more used speciality store with no brand, whereas brand pursuit type more used department store and brand store than other consumer types. The results of this study supported that benefit sought in clothing can be useful as an effective variable for market segmentation.

• 디자인학연구
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• 제15권2호
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• pp.5-18
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• 2002

최근 불교에 대한 관심이 서양사회로부터 높아져가고 있다. 특히 지성인들로부터 불교에 대한 관심이 높아지고 있다면 이는 미래의 서양사회를 변화시킬 동인이 아닐 수 없다. 사실 그 동안 서양이 종교적으로 기독교를 바탕으로 물질문명의 추구에 관심을 가져왔던 동안 동양은 불교를 바탕으로 정신문화 의 추구에 관심을 가져왔다. 그렇지만 개어있는 서양인들이 그들에게 물질적 부를 안겨준 과학적 추구방법과 합리성에 회의를 느끼기 시작함은 무엇을 의미하는가\ulcorner 그것은 서양의 전통적 기독문화에 바탕한 그들의 사상에 한계를 느끼기 시작했 거나 아니면 적어도 동양사상에 대한 흥미를 보이기 시작했음을 의미한다. 특히 산업디자인을 엄격한 합리성을 바탕으로 한 응용과학의 한 분야로서 기술과 생산에 기초한 적극적 기업문화의 한 형태로 볼 때 당연히 불교문화보다는 기독문화에 그 근간을 두고있음이 마땅했을 것이다. 그림에도 불구하고 오늘날 일부 서양지성들의 기독교로부터의 이탈은 그들의 과 학적, 합리적 사상에 근거한 물질문명의 추구가 인간의 근원적 행복추구에 큰 도움이 되지 못했음을 뜻한다고 볼 수 있다. 대신 물질추구로부터 비롯된 그들의 정신적 병리문제가 불교로부터 매우 과학적으로 해결됨에 큰 매료를 느꼈을 것이다. 그것은 개인간의 극심한 경쟁을 통한 서양사상의 적극적 물질추구가 오히려 정신적 불행만 조장함에 비하여 물질적 욕 망을 잠재 우면서 오히려 편안하고 즐거운 생활로 이끌어 가는 불교는 분명 매력 그 자체였으리라 생각된다. 그렇다면 물질 문명의 수단과 방법을 위한 매개체인 '디자인'을 동양의 불교 사상적 측면에서 고찰해볼 필요가 있게 된다.

• 가정과삶의질연구
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• 제26권5호
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• pp.61-74
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• 2008

This research aims to examine and analyze behavior of consumers in pursuit of safety the basis of data Korea Consumer Agency in 2007 2,000 male and females older than 20 years old in Korea. In particular, this study investigates the impact of and life styles of consumers in pursuit of safety. Results of this research could be summarized as follows. First of all, Korean consumers tend to place emphasis on factors such as price and freshness rather than safety in the purchase of vegetables, meats, rice, and fruit.Second, the safety consciousness of consumers is high among female young consumers among consumers showing intermediate positions for the issue of opening domestic markets for foreign agricultural products. Third, this study also examines the impact of life styles on consumers' behavior in pursuit of safety. Such behavior is high among consumers emphasizing values on family and current consumption and showing negative attitudes opening domestic markets for imported foreign agricultural products. Finally, behavior in pursuit of safety is high among female, high school graduated, family-oriented consumers and valuing leisure and showing negative attitudes opening domestic markets for foreign agricultural products. However, safety consciousness of consumers do not generate direct impact on patterns of pursuing safety.

• 수산해양교육연구
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• 제28권1호
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• pp.162-171
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• 2016

The purpose of this study was to examine the mediation of ego-resilience in the relationship between social capital and safety awareness safety pursuit behavior of adult learners in order to provide a basis for planning safety education to improve the safety behaviors. The participants were 162 adult learners who participated in the "Go to find safety classroom of citizens" in Changwon city. Data were collected using self-report questionnaires and analyzed with the SPSS-WIN 20.0 program. As a results, first, the mean score for social capital was 3.36(social confidence 3.38, reciprocal norms 3.29, networks 3.22, democratic citizen awareness 3.56), ego-resilience 3.57. Second, social capital was significant correlation ego-resilience(r=.63, p<.001) and safety awareness safety pursuit behavior(r=.44, p<.001). Third, ego-resilience was significant correlation safety awareness safety pursuit behavior(r=.54, p<.001). Forth, ego-resilience had a partial mediating effect in the relationship between social capital and safety awareness safety pursuit behavior. Based on these findings of this study, safety education focusing on ego-resilience and social capital improvement are highly recommended to promote safety behavior in adult learners.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권5호
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• pp.2400-2413
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• 2019

Doubly-selective (DS) fading channel is often occurred in many orthogonal frequency division multiplexing (OFDM) communication systems, such as high-speed rail communication systems and underwater acoustic (UWA) wireless networks. It is challenging to provide an accurate and fast estimation over the doubly-selective channel, due to the strong Doppler shift. This paper addresses the doubly selective channel estimation problem based on complex exponential basis expansion model (CE-BEM) in OFDM systems from the perspective of distributed compressive sensing (DCS). We propose a novel DCS-based improved sparsity adaptive matching pursuit (DCS-IMSAMP) algorithm. The advantage of the proposed algorithm is that it can exploit the joint channel sparsity information using dynamic threshold, variable step size and tailoring mechanism. Simulation results show that the proposed algorithm achieves 5dB performance gain with faster operation speed, in comparison with traditional DCS-based sparsity adaptive matching pursuit (DCS-SAMP) algorithm.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권9호
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• pp.2284-2298
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• 2013

In this paper, a fast and efficient signal reconstruction algorithm for solving the basis pursuit (BP) problem in compressed sensing (CS) is proposed. This fast linearized Bregman method (FLBM), which is inspired by the fast method of Beck et al., is based on the fact that the linearized Bregman method (LBM) is equivalent to a gradient descent method when applied to a certain formulation. The LBM requires $O(1/{\varepsilon})$ iterations to obtain an ${\varepsilon}$-optimal solution while the FLBM reduces this iteration complexity to $O(1/\sqrt{\varepsilon})$ and requiring almost the same computational effort on each iteration. Our experimental results show that the FLBM can be faster than some other existing signal reconstruction methods.