• Journal of international Conference on Electrical Machines and Systems
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• 제2권2호
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• pp.184-189
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• 2013

This paper proposes a method for improving the performance of a position sensorless control system for a slotless surface permanent magnet synchronous motor (SPMSM) in a very low-speed region. In position sensorless control based on a motor model, accurate motor parameters are required because parameter errors would affect position estimation accuracy. Therefore, online parameter identification is applied in the proposed system. The error between the reference voltage and the voltage applied to the motor is also affect position estimation accuracy and stability, thus it is compensated to ensure accuracy and stability of the sensorless control system. In this study, two voltage error compensation methods are used, and the effects of the compensation methods are discussed. The performance of the proposed sensorless control method is evaluated by experimental results.

• Educational Technology International
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• 제24권1호
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• pp.29-51
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• 2023

This study examined the moderating effect of course satisfaction with class on the relationship between the mode of course delivery and learning presence and performance in university settings. Results showed that there was a moderating effect of the course satisfaction on the relationship between course delivery mode and learning presence. Specifically, higher satisfaction with instructor's teaching activities was associated with improved learning presence in face-to-face, blended, and online learning, in that order. However, there was no significant moderating effect on academic performance. These findings suggest that universities should consider not only the mode of course delivery and highlight the importance of systematic course design by instructors.

• 한국문헌정보학회지
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• 제19권
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• pp.189-241
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• 1990

This study identified cognitive styles of online searchers in terms of Field Dependence (FD) and Field Independence (FI) dimension and determined whether searching performance was affected by FD / FI cognitive differences between online searchers and the extent to which searching performance was affected by the FD / FI dimension of cognitive style. This study used a quasi experimental design with 41 student subjects using the Lockheed DIALOG system and ERIC ONT AP database. Cognitive styles of student subjects were measured by using GEFT (Group Embedded Figure Test) and the subjects were divided into two cognitive groups- FD and FI based on the GEFT scores. Each subject was assigned two predetermined searches which had different search goals-a 'high precision search' and a 'high recall search.' Search performance of the two cognitive groups on the two problems was compared in order to see how these two groups responded to achieving different search goals in terms of search strategy, search inputs, and resulting search outputs. The major findings of this study were: 1. The pattern of approaching a search problem regardless of whether it was a high precision search or a high recall search was not significantly different between the two cognitive groups. 2. The FI group tended to use significantly more terms for the high recall search than the FD group but slightly less time than the FD group. However, significant differences in connect time between the two groups were not revealed. 3. For both search problems the FI group achieved a significantly higher success rate than the FD group. The FI group were significantly more successful searchers than the FD group. As for unit / cost, although the FI group were more cost effective than those of the FD group for both searches, these differences were too small to be statistically significant. 4. Mean differences of the search performance variables between the FD / FI groups were consistent across the two types of search questions. The FI group seemed to be equally effective for both types of search questions. In conclusion, the differences found in number of terms used and success rate between the two cognitive groups apparently resulted from different cognitive styles.

• 한국항만경제학회지
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• 제35권1호
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• pp.39-56
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• 2019

본 연구에서는 우리나라 소매업태의 경영성과에 대한 문제를 다룬다. TV홈쇼핑과 온라인쇼핑을 대표적 사업으로 구성된 무점포통신판매 업태는 2000년대 10년 동안 매우 빠르게 성장하였다. 2010년대의 대략 6년 동안은 온라인쇼핑 사업 모델의 다양화와 경쟁심화 그리고 오프라인쇼핑 소매업의 진입에 의한 경쟁의 확산이 가속화 되었다. 이 같은 2001~2016년의 분석기간 동안에 무점포통신판매업은 오프라인쇼핑 소매업의 비교 업태(백화점, 종합소매업, 일반소매업)보다도 높은 경영성과를 보여주었음을 통계적으로 검정하였다. 성장성과 활동성의 일부 경영성과 지표의 유의미한 차이는 소매업태의 자본구조와 운영구조에 의해 예상되는 점이라고 볼 수 있었다. 특히 무점포통신판매업의 업태를 구성하는 사업체는 다양한 판매 매체와 이질적 사업 모델을 가진다는 점에서 영업이익률과 재고회전율의 지표에 대한 연구 결과의 의미와 향후 경영성과 관리에 대한 추가적 논의 점을 제시하였다.

• 유통과학연구
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• 제22권4호
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• pp.11-22
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• 2024

Purpose: This research delves into the various factors that influence the performance of restaurant businesses on social commerce platforms in Bangkok, Thailand. The study considers both internal and external factors, including but not limited to business characteristics and location. Moreover, this research also analyzes the effects of employing multiple social commerce platforms on business efficiency and explores the underlying reasons for such effects. Research design, data, and methodology: Restaurants can be classified into different price ranges: low, medium, and high. To further investigate, we employed natural language processing AI to analyze online reviews and evaluate algorithm performance using machine learning techniques. We aimed to develop a model to gauge customer satisfaction with restaurants across different price categories effectively. Results: According to the research findings, several factors significantly impact restaurant groups in the low and mid-price ranges. Among these factors are population density and the number of seats at the restaurant. On the other hand, in the mid-and high-price ranges, the price levels of the food and drinks offered by the restaurant play a crucial role in determining customer satisfaction. Furthermore, the correlation between different social commerce platforms can significantly affect the business performance of high-price range restaurant groups. Finally, the level of online review sentiment has been found to influence customer decision-making across all restaurant types significantly. Conclusions: The study emphasizes that restaurants' characteristics based on their price level differ significantly, and social commerce platforms have the potential to affect one another. It is worth noting that the sentiment expressed in online reviews has a more significant impact on customer decision-making than any other factor, regardless of the type of restaurant in question.

• 한국게임학회 논문지
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• 제15권6호
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• pp.41-54
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• 2015

2001년 중국시장에서의 한국 온라인게임의 큰 성과에도 불구하고, 2006년 이후 중국내 위치는 점점 축소되고 있다. 따라서 본 연구는 소비자의 '인지-감정-행위(의도)' 간 관계에서 재이용행위 결정요인과 온라인평가의 조절 효과에 관한 연구모형을 설정하였다. 설문조사를 통하여 회수된 자료를 사용하여 조절회귀 분석을 활용하여 실증분석을 하였다. 분석결과를 보면 재구매 행위에 대해 인지가치와 충성도가 긍정적 영향을 미쳤으며, 온라인평가는 부분적으로 조절 효과를 가졌다. 또한 학력이 통제변수로서 재구매 행위에 부정적 영향을 미쳤다. 따라서 게임업체는 게임개발 시 인지가치와 신뢰/충성도에 영향을 미치는 가격, 품질관리, 정보관리에 주의하여야 하겠으며, 온라인평가의 정확한 분석 결과 등을 잘 활용해야 하겠다.

• 한국의류산업학회지
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• 제25권3호
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• pp.291-303
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• 2023

The purpose of this study is to investigate the impact of technical acceptance factors of Chinese MZ generation consumers' use of online fashion platforms on behavioral intentions and usage behavior, and to determine whether satisfaction plays an additional role in the relationship between behavioral intentions and usage behavior. The research results can be summarized as follows. First, among the technology acceptance factors that influence Generation MZ consumers when they use online fashion platforms, it was found that performance expectancy, effort expectancy, facilitating conditions, hedonic motivation, price value, habit, and content quality significantly influence the behavioral intention to use online fashion platforms. Second, the facilitating conditions and the platform usage intention of Chinese Generation MZ consumers directly and significantly influence the usage behavior on online fashion platforms. In contrast, it was confirmed that habit does not significantly influence actual usage behavior. Third, this study confirmed the moderating effect of satisfaction on the relationship between behavioral intention and usage behavior on online fashion platforms. This research, which proposes a research model explaining the usage intention and behavior of online fashion platforms based on UTAUT2, integrating not only the organizational aspect but also the consumer aspect to empirically verify the usage intention and the final usage behavior from the general consumer's perspective, has academic significance.

• 예술경영연구
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• 제52호
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• pp.75-105
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• 2019

오늘날 문화소비를 연구하는데 있어 실제 관람객의 경험을 구체적으로 이해하고 분석하는 작업은 핵심적이다. 이는 소셜미디어 등 표현할 수 있는 미디어 공간이 증가하면서 실제로 사람들이 많은 공연 경험들을 기록으로 남기고 있기 때문에 이 전에는 접근이 불가능했던 주관적인 경험의 기록들을 데이터로 활용할 수 있게 되었다는 점과 깊이 관련되어 있다. 이 연구는 사람들의 공연 경험이 실제로 어떤 요소로 구성되어 있는지를 온라인상에 존재하는 공연 경험에 대한 사람들의 실제 표현에 기반해 살펴보고자 한다. 이를 위해 두 가지 유형의 데이터를 확보하였다. 먼저 관람 전에 공연 추천을 요청하는 글을 올릴 때 원하는 공연을 어떻게 표현하는가를 지식인과 카페 플랫폼에서 수집해 수식어를 중심으로 분석하였다. 그 결과 사람들은 동반자나 나이와 같은 개인의 구체적인 상황이 반영된 수식어를 주로 사용하는 것으로 나타났다. 한편 티켓예매사이트의 공연 후기 글을 통해 관람 후 경험이 어떻게 묘사되었는가를 분석하였다. 그 결과 기존 연구에서 공연 경험 만족 요소로 알려져 왔던 스토리나 음악과 같은 요소 외에도 동반자, 재관람 의도, 관람 경력과 관련된 표현이 중심을 이루는 것으로 드러났다. 연구 결과에 대한 이론적 논의 뿐아니라 실용적 의의와 한계에 대해서 논의하였다.

• Structural Engineering and Mechanics
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• 제47권3호
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• pp.361-381
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• 2013

A Bayesian probabilistic method is proposed for online estimation of the process noise and measurement noise parameters for Kalman filter. Kalman filter is a well-known recursive algorithm for state estimation of dynamical systems. In this algorithm, it is required to prescribe the covariance matrices of the process noise and measurement noise. However, inappropriate choice of these covariance matrices substantially deteriorates the performance of the Kalman filter. In this paper, a probabilistic method is proposed for online estimation of the noise parameters which govern the noise covariance matrices. The proposed Bayesian method not only estimates the optimal noise parameters but also quantifies the associated estimation uncertainty in an online manner. By utilizing the estimated noise parameters, reliable state estimation can be accomplished. Moreover, the proposed method does not assume any stationarity condition of the process noise and/or measurement noise. By removing the stationarity constraint, the proposed method enhances the applicability of the state estimation algorithm for nonstationary circumstances generally encountered in practice. To illustrate the efficacy and efficiency of the proposed method, examples using a fifty-story building with different stationarity scenarios of the process noise and measurement noise are presented.

• Fashion, Industry and Education
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• 제16권1호
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• pp.1-18
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• 2018

The purpose of this study was to investigate the influence of consumers' regulatory focus on their perceived values of the product as well as shopping process, and willingness to invest resources for online mass-customized products. Data were collected using an online survey from 251 young adult consumers, particularly those who have prior purchase experience of mass-customized products. Interpretation of results indicated that consumers' promotion regulatory focus impacted their perceived values of the product (social, emotional, monetary, and epistemic but not performance), perceived values of the shopping process (hedonic and utilitarian), and willingness to invest more money, time and effort. However, as anticipated, prevention regulatory focus had no significant influence on the dependent variables. Researchers provide crucial implications for brands of online mass-customized products to segment their market based on regulatory orientation, as well as better cater to customer demands by positioning their products as offering benefits that specifically caters to the needs of such consumers.