• East Asian mathematical journal
• /
• 제17권2호
• /
• pp.217-224
• /
• 2001

In this paper, we introduce the notion of some modification of given convergence structure and product convergence. Also, we find some properties which hold between the modification associated with a product of convergence structures and the product of modifications associated with the factor convergence structures.

• 대한전기학회논문지
• /
• 제39권8호
• /
• pp.856-867
• /
• 1990

In this paper, the convergence and the learning accuracy of the back-propagation (BP) method in neural network are investigated by 1) analyzing the reason for decelerating the convergence of BP method and examining the rapid deceleration of the convergence when the learning is executed on the part of sigmoid activation function with the very small first derivative and 2) proposing the modified logistic activation function by defining, the convergence factor based on the analysis. Learning on the output patterns of binary as well as analog forms are tested by the proposed method. In binary output patter, the test results show that the convergence is accelerated and the learning accuracy is improved, and the weights and thresholds are converged so that the stability of neural network can be enhanced. In analog output patter, the results show that with extensive initial transient phenomena the learning error is decreased according to the convergence factor, subsequently the learning accuracy is enhanced.

• 전자공학회논문지B
• /
• 제33B권3호
• /
• pp.1-8
• /
• 1996

This paper proposes a novel transversal filter and an optimal LMS algorithm, and show how these can be realized as an adaptive equalizer. The transversal filter consists of a walsh and block pulse functions. in the LMS algorithm with equalizers, the convergence factor is an improtant design parameter because it governs stability and convergence speed. The conventional adaptation techniques use a fixed time constant convergence factor by the trial and error method. In this paper, an optimal method in the choice of the convergence factor is proposed. The proposed algorithm is obtrained that is tailored for each filter tap and is updated at each iteration. The performance of the proposed algorithm is compared iwth those of the conventional TDL and DFT equalizers by computer simulations.

• 열처리공학회지
• /
• 제36권4호
• /
• pp.237-241
• /
• 2023

Recently, research on flexible sensors for personal health management has been gaining attention. In this study, we fabricated a crack-based flexible sensor in thin film form to measure the pulse on the wrist. We evaluated the characteristics of the sensor based on the curing conditions of the PDMS (Polydimethylsiloxane) film to optimize the sensor's gauge factor. The modulus of PDMS varies depending on the curing conditions. In this case, the modulus of PDMS has a significant influence on crack formation, leading to changes in the sensitivity of the sensor. This study examined the changes in the gauge factor associated with these variations.

• 한국융합학회논문지
• /
• 제8권12호
• /
• pp.317-327
• /
• 2017

본 연구의 목적은 항공사 기내식 서비스품질, 항공사의 고객만족, 브랜드이미지와 브랜드충성도와의 융합적 관계를 분석하는데 있다. 본 연구에서는 항공사를 이용하는 고객을 대상으로 설문지 170부를 SPSS 18.0window를 통해 요인분석, 신뢰도분석, 상관관계분석, 다중회귀분석을 진행하여 연구결과를 도출하였다. 분석결과는 기내식 서비스품질 요인은 음식요인, 서비스요인과 청결요인으로 도출되었다. 첫째, 기내식 서비스품질요인 중 음식요인 고객만족에 정(+)의 유의한 영향을 미쳤다. 둘째, 음식요인과 서비스요인은 브랜드이미지에 유의한 정(+)의 영향을 미쳤다. 셋째, 고객만족은 브랜드이미지와 브랜드충성도에 유의한 정(+)의 영향을 미치는 것으로 나타났다. 또한, 브랜드이미지도 브랜드충성도에 유의한 정(+)의 영향을 미치는 것으로 나타났다. 이 연구를 통해서 보면 항공서비스에 있어서 기내식 서비스품질 관리, 고객만족, 브랜드이미지 그리고 브랜드충성도 모두가 항공사의 성공적인 마케팅 전략에 매우 중요하다.

• 융합보안논문지
• /
• 제11권6호
• /
• pp.31-36
• /
• 2011

클라우드 컴퓨팅은 자원을 편리하고 효율적으로 사용하기 위해 만들어진 시스템이다. 본 논문에서는 PKI와 ID_PW 그리고 지리정보 조합을 이용한 2-factor 인증방법을 제안한다. 제안한 방법은 하이브리드 클라우드 환경에 적합하며 자원과 데이터를 보다 안전하게 관리할 수 있다.

• 한국안광학회지
• /
• 제1권1호
• /
• pp.29-39
• /
• 1996

Triplet 카메라 렌즈계(f'=50mm, f/3.5)를 통하여 고유값의 중간값은 최적의 감쇠 계수임과, 정규 방정식을 풀 때 SVD 직교화 방법을 적용하면 불량 조건을 제거하여 계산의 정확도를 높일 수 있어서 merit 함수는 최소값에 안정하면서도 빠르게 수렴할 수 있다는 것을 조사하였다. 양호 조건인 triplet 카메라 렌즈계에서 SVD 직교화 방법을 적용한 DLS 법에서 얻은 최소 merit 함수는 가우스 소거법에서 얻은 최소 merit 함수의 97.86%로서 크게 개선되지는 못하였다. 따라서 SVD 직교화 방법을 적용한 DLS 법이 가우스 소거법을 적용한 DLS 법보다 감쇠 계수 적용에 대한 안정성과 수렴속도가 좋으며, 최적화 방법에 적절한 감쇠 계수를 적용시켜주면 최적화 과정의 수렴 속도가 개선됨을 알 수 있었다.

• 수산해양교육연구
• /
• 제27권6호
• /
• pp.1880-1890
• /
• 2015

The purpose of this study was to development of the 'convergence motive' scale for interdisciplinary knowledge fusion. Based on results from literature review, this study clarifies a theoretical ground for 'convergence motive'. Initial items to measure this concept were verified by content analysis and then finalized. After a pilot test done with 568 college students, gathered data were analyzed by item selection and exploratory factor analysis to verify their validity. Next, the main test implemented with 1,211 college students was analyzed with exploratory factor analysis using the method for rotation based on maximum likelihood analysis and direct oblimin for validating the final items to measure 'convergence motive'. As a result, the scale for 'convergence motive' consists of 43 items to measure the following four factors: collaboration to identifying and solving problems, challenge of a new perspective, communication for convergence, cohesion for convergence. Construct validity and criterion-related validity were performed at last to check this scale's theoretical construct. In conclusion, this study concluded that the scales for convergence motive could be generalized and applicable to other samples.

• 한국산업융합학회 논문집
• /
• 제25권2_1호
• /
• pp.141-148
• /
• 2022

In this paper, the evaluation equations proposed by Tange et al. and Ando et al. were used to evaluate the threshold stress intensity factor ∆K^R_th(s) and fatigue limit ∆𝜎^R_wc, according to the small crack of offshore structural steel F690. Despite the differences in concept and shape of the two equations, the ∆K^R_th(s) and ∆𝜎^R_wc proved completely consistent. It is possible to use these equations to evaluate the dependence of the crack length on the ∆K^R_th(s) and ∆𝜎^R_wc of structures made of all steel grades. With these equations, the characteristics of microcracks can be quantitatively evaluated, and the safety and reliability of the structure can be secured.

• 한국자기학회:학술대회 개요집
• /
• 한국자기학회 2014년도 임시총회 및 하계학술연구발표회
• /
• pp.117-117
• /
• 2014