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.
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.
61509689
Blackboard scheduler control knowledge for heuristic classification: Representation and inference
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.
8249874
Software retrieval by samples using concept analysis
Abstract Finding and retrieving software components is one of the tasks of the building-block approach to software reuse. One interesting property of code components unlike other types of software artifacts is that they can be executed. The execution-based retrieval process tends to be too long to be incorporated in practice and faces the problem of non-termination and very long execution time. This paper describes a software component retrieval method using sample input–output behavior of the components (but without actual execution) based on concept analysis. The retrieval uses samples chosen by the developers of the components (rather than generated randomly or provided by the users). Based on the validity relation between components and samples, a concept lattice is constructed for the library by applying formal concept analysis. The user retrieves components by selecting valid samples incrementally for a desired component from a dynamically created menu of samples available in the library. Our method avoids the problems associated with actual execution-based retrieval such as non-termination and very long execution time, and also improves the retrieval time. Our approach can be directly applied to other levels of software components than code components as long as the components can be described in terms of some input–output relation.
44265379
A Combined Technique of Non-uniform Loops
This paper proposes efficient methods such as Improved Tiling Method for non-uniform dependence loops with only flow dependences and Improved Region Partitioning Method for loops with both flow and anti dependences. In the Improved Tiling Method, we propose our incrementing minimum dependence distance technique and loop interchanging technique. In Improved Region Partitioning Method, we eliminate anti dependences from the nested loop by variable renaming. After variable renaming, this method can divide the iteration space into two parallel regions as large as possible and one or less serial region as small as possible. By combination of existing methods and our proposed methods, it exposes more parallelism.
12684408
Intelligent and Effective Digital Watermarking Scheme for Mobile Content Service
In this paper, digital watermarking scheme that is intelligent and effective in protecting a copyright of image data under image transformation such as scaling, rotation, and JPEG lossy compression is proposed. Especially, the proposed scheme is a robust algorithm for mobile content service. It means that the proposed watermarking is robustness to protect impulse noise attacks. The watermark and inserted watermark are very different from each other. The original watermark is recomposed using the code granted to a copyrighter or customer. The proposed algorithm is an extension of spread-spectrum watermarking algorithm that obtains the convolution value of PN sequence. Correlator and decision circuit in our algorithm are required. Because just a little watermark is embedded in the original image, this decision circuit plays an important role for detecting this watermark and then the intelligent method for the decision must be required. Degradation of image quality between original image and watermarked image in order to confirm required invisibility in the digital watermarking system and watermark robustness to protect various attacks from the outside are analyzed using the value of PSNR and recovered rate of watermark image. The experimental result shows that image quality is less degraded as the PSNR of 93.75 dB. It is also observed that excellent watermark detection is achieved under an image transformation and JPEG lossy compression, and watermark can be effectively detected in case of the image inserted impulse noise, which PSNR is 7.97 dB.