31650942
An empirical study on effectiveness of temporal information as implicit ratings
Collaborative filtering is a widely used and proven method of building recommender systems, which provide personalized recommendations on products or services based on explicit ratings from users. Recommendation accuracy becomes an especially important factor in some e-commerce environments (such as a mobile environment, due to limited connection time and device size). As user preferences change over time, temporal information can improve recommendation accuracy. This paper presents a variety of temporal information including item launch time, user buying time, the time difference between the two, as well as several combinations of these three. We conducted an empirical study on how temporal information affects the accuracy of a collaborative filtering system for recommending character images (wallpapers) in a mobile e-commerce environment. Empirical results show the degree of effectiveness of a variety of temporal information. The empirical results give insight on how to incorporate temporal information to maximize the effectiveness of collaborative filtering in various e-commerce environments.
11709593
Transition: Recommending Mobile Content using Content Diffusion and User Preference
An improved release coating for heat transferable laminate and improved method for curing the release coating for heat transferable laminates wherein an ink design layer is transferred from a carrier web onto an article such as a plastic or glass container upon application of heat and pressure. The improved release coating does not contain wax components but exhibits release properties similar to wax based formulations. The improved release contains U-V curable components which are cured by exposure to ultraviolet light after the laminate containing the ink design, is transferred to a receiving article. The heat transferable laminate preferably includes a barrier layer intermediate the release layer and ink design layer. The barrier layer also contains U-V curable components. The barrier layer is cured by exposure to ultraviolet radiation during formation of the laminate structure and prior to transfer of the laminate to a receiving article. The improved release formulation upon curing by ultraviolet radiation produces a hard, glossy, optically clear protective layer exhibiting enhanced resistance to abrasion, scuffing and solvent attack.
3876714
A Time-Based Recommender System Using Implicit Feedback
Recommender systems provide personalized recommendations on products or services to customers. Collaborative filtering is a widely used method of providing recommendations based on explicit ratings on items from other users. However, in some ecommerce environments such as a mobile environment, it is difficult to collect explicit feedback data; only implicit feedback is available. In this paper, we present a method of building an effective collaborative filtering-based recommender system for an e-commerce environment without explicit feedback data. Our method constructs pseudo rating data from the implicit feedback data. When building the pseudo rating matrix, we incorporate temporal information such as the user’s purchase time and the item’s launch time in order to increase recommendation accuracy. Based on this method, we built a recommender system for a mobile e-commerce environment and conducted several experiments. Empirical results show our collaborative filtering-based recommender system to be significantly more accurate than a pure collaborative filtering system. Our approach can be applied to building collaborative filtering-based recommender systems for any ecommerce environment without explicit feedback.
15260516
A Similarity Measure for Collaborative Filtering with Implicit Feedback
Collaborative Filtering(CF) is a widely accepted method of creating recommender systems. CF is based on the similarities among users or items. Measures of similarity including the Pearson Correlation Coefficient and the Cosine Similarity work quite well for explicit ratings, but do not capture real similarity from the ratings derived from implicit feedback. This paper identifies some problems that existing similarity measures have with implicit ratings by analyzing the characteristics of implicit feedback, and proposes a new similarity measure called Inner Product that is more appropriate for implicit ratings. We conducted experiments on user-based collaborative filtering using the proposed similarity measure for two e-commerce environments. Empirical results show that our similarity measure better captures similarities for implicit ratings and leads to more accurate recommendations. Our inner product-based similarity measure could be useful for CF-based recommender systems using implicit ratings in which negative ratings are difficult to be incorporated.
16378618
e-Gov Net Based Emergency Management Service
Over the past decade years, there has been a significant evolution in thinking about not only emergency management but also disasters among IT-related workers, policymaker, and other involved in the disaster fields. In the view point of ubiquitous computing environment, the current e-Gov net has some problems in business process and in service due to the unbalanced management of administration. Therefore, there are limitations for improving the service to the people. It is also need to e-Gov net acceleration propulsion correspond to the change of technology such as BcN, IPv6, USN as well as the change of social environment. What is more, it is needed to systematic research corresponding to the needs of future-oriented government service which is available to e-Gov net guaranteeing in security and emergency management as well. In this paper, the methodology for developing new services is proposed, which is based on e-Gov net. Secondly, the basics of the BC (business continuity) and the DR (disaster recovery) of IT-centric perspective are introduced.
97650917
Electrical properties of Pb(Zr,Ti)O3 films prepared on ITO glass
Pb(Zr,Ti)O"3 thin films were successfully prepared on a Pt bottom electrode with indium tin oxide coated glass substrates using RF magnetron sputtering. Use of the indium tin oxide coated glass substrate reduced the fatigue characteristics and provided for excellent crystallization of the Pb(Zr,Ti)O"3 thin films. The polarization versus fatigue characteristics showed 10% degradation after 10^9 cycles. These results indicate that Pt/indium tin oxide double electrodes can be improved both in terms of fatigue and ferroelectric properties through the use of Pb(Zr,Ti)O"3 thin films on glass substrates, resulting in better performance than metal electrodes.
32680230
A methodology for predicting service life and design of reliability experiments
This paper summarizes a methodology for reliability prediction of new products where field data are sparse, and the allowed number & length of experiments are limited. The methodology relies on estimating a set where the unknown parameters are most likely to be found, calculation of an upper bound for the reliability metric of interest conditioned that the parameters reside in the estimated set, and tightening the bounds via design of experiments. Models of failure propagation, failure acceleration, system operations, and time/cycle to failure at various levels of fidelity & expert elicited information may be incorporated to enhance the accuracy of the predictions. The application of the model is illustrated through numerical studies.
20350229
Cyworld is my world: Korean adult experiences in an online community for learning
This article introduces Cyworld, a popular online social networking service in South Korea, and explores it as a potential context in which informal learning occurs through social activities and communication. Based on the results of an online survey, this article discusses (a) the nature of social activities in Cyworld in terms of informal adult learning, (b) user perception of online activities in relation to learning, and (c) the relationship between the users' perception of the online activities and their definitions of learning (i.e., learning as acquisition or as reflection). The article concludes that Cyworld appears to be a meaningful context that facilitates informal learning, and that users who emphasise a meaning-making process for learning perceive that mini-homepage activities are both learning-related and constructive.
15172968
A structured approach to retrieving functions by types
A solid state area imaging apparatus having a photosensor matrix array disposed at a front surface area of a substrate and having a charge transfer arrangement for transferring charges generated in the photosensors of the matrix so as to convert them into a serial signal. It also includes a penetrative charge transfer arrangement for transferring the charge from the front surface area of the substrate to the back surface area of the substrate, and which has a static induction transistor structure. The charges are transferred vertically through a channel formed in the structure of the static induction transistor. This penetrative charge transfer arrangement may be used as a part of the transfer path for generating the serial signal or a path for removing excess charges which are generated in the photosensors.