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비선형 특징추출 기법에 의한 머리전달함수(HRTF)의 저차원 모델링 및 합성
서상원,김기홍,김현석,김현빈,이의택,Seo, Sang-Won,Kim, Gi-Hong,Kim, Hyeon-Seok,Kim, Hyeon-Bin,Lee, Ui-Taek 한국정보처리학회 2000 정보처리논문지 Vol.7 No.5
For the implementation of 3D Sound Localization system, the binaural filtering by HRTFs is generally employed. But the HRTF filter is of high order and its coefficients for all directions have to be stored, which imposes a rather large memory requirement. To cope with this, research works have centered on obtaining low dimensional HRTF representations without significant loss of information and synthesizing the original HRTF efficiently, by means of feature extraction methods for multivariate dat including PCA. In these researches, conventional linear PCA was applied to the frequency domain HRTF data and using relatively small number of principal components the original HRTFs could be synthesized in approximation. In this paper we applied neural network based nonlinear PCA model (NLPCA) and the nonlinear PLS repression model (NLPLS) for this low dimensional HRTF modeling and analyze the results in comparison with the PCA. The NLPCA that performs projection of data onto the nonlinear surfaces showed the capability of more efficient HRTF feature extraction than linear PCA and the NLPLS regression model that incorporates the direction information in feature extraction yielded more stable results in synthesizing general HRTFs not included in the model training.
턴테이블을 적용한 유인비행체 가상훈련 시뮬레이터용 스튜어트 플랫폼 개발
서상원,우재훈,홍천한,SO, Sangwon,Woo, Jaehoon,Hong, Chunhan 한국항공운항학회 2020 한국항공운항학회지 Vol.28 No.4
In order to study the correlation between the pilot's cognitive ability and recovery ability by applying a physical element that can cause spatial loss of position to the pilot, a turntable was installed on the top of the motion system to give a quantitative rotational error. We propose a method of simulating flight movement to reduce a difference in feeling and an intuitive method of forward kinematic analysis.
PVDF 필름 기반 센서를 이용한 무구속적인 누운 자세 추정
서상원,황수환,윤희남,정다운,최재원,이유진,정도언,박광석,Seo, Sangwon,Hwang, Su Hwan,Yoon, Hee Nam,Jung, Da Woon,Choi, Jae Won,Lee, Yu Jin,Jeong, Do-Un,Park, Kwang Suk 대한의용생체공학회 2014 의공학회지 Vol.35 No.5
As body postures on bed affects various sleep related diseases, it is considered as important information when monitoring sleeping in daily life. Though there have already been a few approaches to monitor body postures on bed conventionally, the development for simple and unconstrained methods is still needed to realize the long-term daily monitoring. Focusing on the fact that ballistocardiogram changes depending on the body postures on bed, we developed a novel method to estimate body posturesusing extremely simple, film-type ballistocardiogram sensor which is based on polyvinylidene fluoride(PVDF) film. With 10 subjects, we performed two experiments. One was for an estimation test to show that body postures on bed can be estimated by ballistocardiogram, and the other was for a reproducibility test to present the feasibility of ballistocardiogram based body postures monitoring. To estimate body postures on bed, we made an individual template set of body postures by designating one ballistocardiogram (BCG) sample as a template in each postures. Then, we calculated Pearson's correlation coefficients between a sample and each templates and estimated the body posture of the sample by choosing a posture which corresponds to the most significant correlation coefficients. As a result, we estimated body postures on bed with 99.2% accuracy in average and found that the estimation using ballistocardiogram is reproducible.
AHP 기법을 적용한 국방정보시스템 보호를 위한 사이버전 교육 방안 연구
서상원,오우진,김호길 보안공학연구지원센터(JSE) 2015 보안공학연구논문지 Vol.12 No.2
본 논문은 사이버전을 담당하는 전문 인력 양성 방안에 관한 연구로써 군의 사이버 작전수행 능력 확보를 위한 우리나라 사이버전 분야의 인적자원 교육 환경 실태를 파악한다. 특히, 군에서 요구하는 사이버전 인력 특성을 파악하고 그에 적합한 교과목 선정을 위하여 계층 분석적 의사결정(AHP) 기법 을 적용해 사이버전 전문 인력 양성에 필요한 중요 요소를 민과 군의 정보 보호 실무자를 대상으로 산출한다. AHP 분석 결과, 사이버전 전문 인력은 기술 부분의 능력 뿐 아니라 국방정보시스템 운용 능력 및 사이버전 정책에 대한 이해가 요구되는 것으로 나타났다. This paper presents a method for cultivating cyber-warfare professionals. In order to achieve that, we examined the current education environments of cyber-warfare. Also, this paper focuses on determining important factors for cultivating cyber-warfare professionals using AHP analysis. As a results, cyber warfare professionals require the ability to understand security technology, defense information system, and cyber warfare strategy.
호텔 조리사의 학습조직이 창의성, 혁신행동, 조직성과에 미치는 영향
서상원,이재곤,유을순 관광경영학회 2017 관광경영연구 Vol.79 No.-
This study aimed to analyze the influence of the learning organization of cooks at five-star hotels on creativity, innovative behavior, and organizational achievement, and put forward an efficient proposal based on the results of the analysis. For the purposes of the study, a total of 322 questionnaires were distributed to a parent population of cooks at five-star hotels in Seoul and 301 questionnaires with qualified responses were utilized in the empirical analysis. The collected data was analyzed using the SPSS ver. 21.0 and AMOS ver. 18.0 statistics package. As a result of an empirical analysis based on a structural equation model analysis, the hypothesis on the learning organization of hotel cooks having an effect on creativity (Hypothesis 1) was adopted. Accordingly, the hypothesis on the learning organization of hotel cooks having an effect on innovative behavior (Hypothesis 2); the hypothesis predicting that the learning organization of hotel cooks has an effect on organizational achievement (Hypothesis 3); the hypothesis that creativity affects innovative behavior (Hypothesis 4); the hypothesis that creativity affects organizational achievement (Hypothesis 5); and lastly, the hypothesis that innovative behavior affects organizational achievement (Hypothesis 6) were adopted. In this study, practical and academic implications were given based on these findings.