온라인 상품평의 질과 상품평 작성자의 사진이 상품 및 쇼핑몰에 대한 소비자 평가에 미치는 영향

학위논문 (석사)-- 서울대학교 대학원 : 언론정보학과, 2012. 8. 이은주.본 연구는 온라인 상품평의 질과 상품평 작성자의 사진이 소비자의 태도 형성에 미치는 효과를 밝히고자 했다. 이와 동시에, 상품 유형이 상품평의 질과 작성자 사진의 효과에 어떠한 변화를 줄 수 있는지, 즉 상품 유형의 중재 효과 가능성에 대해서 살펴 보았다. 이를 위해, 2 (상품평의 질: 높음 vs. 낮음) x 2 (상품평 작성자 표현: 실제 사진 vs. 도형) x 2 (상품 유형: 경험재 vs. 검색재) 요인설계를 적용한 실험을 252 명의 대학생을 대상으로 온라인에서 실시했다. 실험에 사용된 상품평들은 대부분 해당 상품에 대해 긍정적인 태도를 취하도록 고정되었다. 실험 결과 발견된 주요한 결과는 다음과 같다. 먼저, 고품질 상품평을 읽은 참여자들의 경우, 저품질 상품평을 읽은 참여자들에 비해 상품평 작성자, 해당 상품, 그리고 온라인 쇼핑몰 웹사이트을 더욱 긍정적으로 평가하는 경향을 보였다. 다음으로, 상품평 작성자들의 사진은 도형(느낌표)과 사회적 실재감에서 차이를 보이지 않았으며, 나아가 상품평 작성자, 해당 상품, 그리고 쇼핑몰 웹사이트에 대한 평가에서도 차이를 보이지 않았다. 하지만, 사진이 있을 때, 사람들은 고품질 상품평을 읽었을 때, 저품질 상품평을 읽었을 때에 비해 더 쇼핑몰을 긍정적으로 평가하는 경향을 보였다. 또한, 사람들은 사진을 보았을 때 판매자로부터 주어진 상품 설명을 정확히 기억하지 못하는데 반해, 상품평의 내용을 기억하는 능력에서는 사진을 보지 못한 사람들과 차이가 없었다. 마지막으로, 상품 유형은 상품평 작성자의 사진과는 상호작용이 없었지만, 상품평의 질과의 상호작용효과가 존재했다. 즉, 실제 구매 후 경험하기 이전에도 쉽게 상품의 질을 예측할 수 있는 검색재의 경우, 고품질 상품평이 저품질 상품평에 비해 상품 구매 의사를 더 증가시켰지만, 실제 경험 없이 상품의 품질을 측정하기 어려운 경험재의 경우에는 고품질 상품평과 저품질 상품평 간에 구매 의사 차이가 나타나지 않았다. 이상의 결과들이 갖는 이론적 및 실용적 함의를 논의에 제시했다.This study aimed to elucidate the effects of review quality and reviewer representation in forming consumers attitudes. In so doing, if, and if so, how product type varies the effects of those two factors was also explored. In order to answer these questions, a 2 (review quality: high vs. low) x 2 (reviewer representation: photos vs. abstract figure) x 2 (product type: experience vs. search) between-subject experiment was conducted online. The product reviews used were mostly positive toward the target product. First, participants who read high quality product reviews evaluated the reviewers, product and seller website more positively than those who read low quality reviews. Second, reviewers profile photos did not evoke higher or lesser social presence than abstract figures did. Likewise, there was no difference in evaluations of reviewers, product, and website between photos and figures. However, photos made people more likely to differentiate high quality reviews from low quality reviews, with high quality reviews eliciting more positive website evaluation than low quality reviews. In addition, photos hindered correct recognition of product descriptions (information given by the seller), although they did not significantly alter the recall of review content (information given by the reviewers). Third, product type interacted with review quality, but not with reviewer representation. For search goods, which refers to the products whose quality is easily predicted before purchase, high quality reviews significantly increased purchase intention. However, the effect of review quality was not found for experience goods, which are defined as the products whose values are hardly assessed before firsthand experience. Theoretical and practical implications of these results were discussed.Introduction 1 Literature Review 4 EFFECTS OF REVIEW QUALITY 4 EFFECTS OF REVIEWER REPRESENTATION 8 PRODUCT TYPE AS A MODERATOR 17 Research Questions and Hypotheses 24 Method 27 PILOT TEST 1 27 PILOT TEST 2 28 MAIN EXPERIMENT 34 Participants 34 Procedure 34 Experiment stimuli 34 Measures 38 Results 41 MANIPULATION CHECK 41 HYPOTHESIS TESTS 41 Affective reactions 41 Behavioral intention 46 Cognitive reactions 48 Discussion 51 THEORETICAL IMPLICATIONS 51 LIMITATIONS AND FUTURE DIRECTIONS 55 Conclusion 59 References 60Maste

Special issue on “Modeling and Performance Evaluation of Wireless Ad-Hoc Networks”

A primary aim of wireless ad-hoc networks is to deliver data in areas where there is no pre-defined infrastructure. In these networks, the users, but also the network entities can be potentially mobile. Wireless ad-hoc networks have recently witnessed their fastest growth period ever in history. Real wireless ad-hoc networks are now implemented, deployed and tested, and this trend is likely to increase in the future. However, as such networks are increasingly complex, performance modeling and evaluation play a crucial part in their design process to ensure their successful deployment and exploitation in practice. This special issue on Modeling and Performance Evaluation of Wireless Ad-Hoc Networks aims to open a new critical debate on the evaluation of wireless ad-hoc networks. It includes original theoretical and/or practical contributions, from researchers and practitioners that identify and address issues in evaluating wireless ad-hoc networks.Peer ReviewedPostprint (author's final draft

Childhood Eating and Feeding Disturbances

Eating and feeding disturbances are prevalent yet understudied health conditions in youth. They are characterized by aberrant eating behaviors, cognitive and emotional dysfunctions, and dysregulated body weight. The Diagnostic and Statistical Manual of Mental Disorders Fifth Edition defines several feeding and eating disorders with a common onset in youth; however, data on their clinical validity at young ages are lacking. Further non-normative eating behaviors exist, but their clinical relevance needs elucidation. This Special Issue compiles state-of-the-art reviews and empirical research on the presentation, development, course, and maintenance of diverse eating and feeding disturbances as a prerequisite for delineating evidence-based interventions for treatment and prevention

Special section on smart grids: A hub of interdisciplinary research : IEEE ACCESS Special section editorial smart grids: A hub of interdisciplinary research

International audienceThe smart grid is an important hub of interdisciplinary research where researchers from different areas of science and technology combine their efforts to enhance the traditional electrical power grid. Due to these efforts, the traditional electrical grid is now evolving. The envisioned smart grid will bring social, environmental, ethical, legal and economic benefits. Smart grid systems increasingly involve machine-to-machine communication as well as human-to-human, or simple information retrieval. Thus, the dimensionality of the system is massive. The smart grid is the combination of different technologies, including control system theory, communication networks, pervasive computing , embedded sensing devices, electric vehicles, smart cities, renewable energy sources, Internet of Things, wireless sensor networks, cyber physical systems, and green communication. Due to these diverse activities and significant attention from researchers, education activities in the smart grid area are also growing. The smart grid is designed to replace the traditional electrical power grid. The envisioned smart grid typically consists of three networks: Home Area Networks (HANs), Neighborhood Area Networks (NANs), and Wide Area Networks (WANs). HANs connect the devices within the premises of the consumer and connect smart meters, Plug-in Electric Vehicles (PEVs), and distributed renewable energy sources. NANs connect multiple HANs and communicate the collected information to a network gateway. WANs serve as the communication backbone. Communication technologies play a vital role in the successful operation of smart grid. These communication technologies can be adopted based upon the specific features required by HANs, NANs, and WANs. Both wired and the wireless communication technologies can be used in the smart grid [1]. However, wireless communication technologies are suitable for many smart grid applications due to the continuous development in the wireless research domain. One drawback of wireless communication technologies is the limited availability of radio spectrum. The use of cognitive radio in smart grid communication will be helpful to break the spectrum gridlock through advanced radio design and operating in multiple settings, such as underlay, overlay, and interweave [2]. The smart grid is the combination of diverse sets of facilities and technologies. Thus, the monitoring and control of transmission lines, distribution facilities, energy generation plants, and as well as video monitoring of consumer premises can be conducted through the use of wireless sensor networks [3]–[6]. In remote sites and places where human intervention is not possible, wireless sensor and actuator networks can be useful for the successful smart grid operation [7], [8]. Since wireless sensor networks operate on the Industrial, Scientific, and Medical (ISM) band, the spectrum might get congested due to overlaid deployment of wireless sensor networks in the same premises. Thus, to deal with this spectrum congestion challenge, cognitive radio sensor networks can be used in smart grid environments [9], [10]. The objective of this Special Section in IEEE ACCESS is to showcase the most recent advances in the interdisciplinary research areas encompassing the smart grid. This Special Section brings together researchers from diverse fields and specializations, such as communications engineering, computer science, electrical and electronics engineering, educators, mathematicians and specialists in areas related to smart grids. In this Special Section, we invited researchers from academia, industry, and government to discuss challenging ideas, novel research contributions, demonstration results, and standardization efforts on the smart grid and related areas. This Special Section is a collection of eleven articles. These articles are grouped into the following four areas: (a) Reliability, security, and privacy for smart grid, (b), Demand response management, understanding customer behavior, and social networking applications for smart grid, (c) Smart cities, renewable energy, and green smart grid, and (d) Communication technologies, control and management for the smart grid

An Overview of Mobile Ad Hoc Networks for the Existing Protocols and Applications

Mobile Ad Hoc Network (MANET) is a collection of two or more devices or nodes or terminals with wireless communications and networking capability that communicate with each other without the aid of any centralized administrator also the wireless nodes that can dynamically form a network to exchange information without using any existing fixed network infrastructure. And it's an autonomous system in which mobile hosts connected by wireless links are free to be dynamically and some time act as routers at the same time, and we discuss in this paper the distinct characteristics of traditional wired networks, including network configuration may change at any time, there is no direction or limit the movement and so on, and thus needed a new optional path Agreement (Routing Protocol) to identify nodes for these actions communicate with each other path, An ideal choice way the agreement should not only be able to find the right path, and the Ad Hoc Network must be able to adapt to changing network of this type at any time. and we talk in details in this paper all the information of Mobile Ad Hoc Network which include the History of ad hoc, wireless ad hoc, wireless mobile approaches and types of mobile ad Hoc networks, and then we present more than 13 types of the routing Ad Hoc Networks protocols have been proposed. In this paper, the more representative of routing protocols, analysis of individual characteristics and advantages and disadvantages to collate and compare, and present the all applications or the Possible Service of Ad Hoc Networks.Comment: 24 Pages, JGraph-Hoc Journa

Co-experience Network Dynamics: Lessons from the Dance Floor.

Experience and socialization are key factors in determining customer commitment and renewal decisions in the service sector. To analyse the combined effect of experience and socialization, in this paper we introduce the concept of co-experience networks. A new methodological approach, originally applied in the field of social ethology, is devised to study reality-mined co-experience networks. By analysing a network of health club members over four years, we find that long-experienced clients have a lower chance to renew their contracts. On the other hand, central members in the co-experience network are stable and tend to renew their memberships. Further, since the members of the same reference group align their levels of commitment, renewal decisions are clustered in a small-world network. These findings contribute to our understanding of social dynamics and localized conformity in customer decision-making that can be used to plan marketing strategies to improve customer retention.

Improving the Performance of Cooperative Platooning with Restricted Message Trigger Thresholds

Cooperative Vehicular Platooning (Co-VP) is one of the most prominent and challenging applications of Intelligent Traffic Systems. To support such vehicular communications, the ETSI ITS G5 standard specifies event-based communication profiles, triggered by kinematic parameters such as speed. The standard defines a set of threshold values for such triggers but no careful assessment in realistic platooning scenarios has been done to confirm the suitability of such values. In this work, we investigate the safety and performance limitations of such parameters in a realistic platooning co-simulation environment. We then propose more conservative threshold values, that we formalize as a new profile, and evaluate their impact in the longitudinal and lateral behaviour of a vehicular platoon as it carries out complex driving scenarios. Furthermore, we analyze the overhead introduced in the network by applying the new threshold values. We conclude that a pro-active message transmission scheme leads to improved platoon performance for highway scenarios, notably an increase greater than 40% in the longitudinal performance of the platoon, while not incurring in a significant network overhead. The obtained results also demonstrated an improved platoon performance for semi-urban scenarios, including obstacles and curves, where the heading error decreases in 26%, with slight network overhead.info:eu-repo/semantics/publishedVersio

English as a skill in occupations

Thesis (Ed.M.)--Boston Universit