We know what you want to buy:a demographic-based system for product recommendation on microblogs

Product recommender systems are often deployed by e-commerce websites to improve user experience and increase sales. However, recommendation is limited by the product information hosted in those e-commerce sites and is only triggered when users are performing e-commerce activities. In this paper, we develop a novel product recommender system called METIS, a MErchanT Intelligence recommender System, which detects users' purchase intents from their microblogs in near real-time and makes product recommendation based on matching the users' demographic information extracted from their public profiles with product demographics learned from microblogs and online reviews. METIS distinguishes itself from traditional product recommender systems in the following aspects: 1) METIS was developed based on a microblogging service platform. As such, it is not limited by the information available in any specific e-commerce website. In addition, METIS is able to track users' purchase intents in near real-time and make recommendations accordingly. 2) In METIS, product recommendation is framed as a learning to rank problem. Users' characteristics extracted from their public profiles in microblogs and products' demographics learned from both online product reviews and microblogs are fed into learning to rank algorithms for product recommendation. We have evaluated our system in a large dataset crawled from Sina Weibo. The experimental results have verified the feasibility and effectiveness of our system. We have also made a demo version of our system publicly available and have implemented a live system which allows registered users to receive recommendations in real time. © 2014 ACM.

Coordinating expertise across knowledge boundaries in offshore-outsourcing projects:the role of codification

The coordination of effort within and among different expert groups is a central feature of contemporary organizations. Within the existing literature, however, a dichotomy has emerged in our understanding of the role played by codification in coordinating expert groups. One strand of literature emphasizes codification as a process that supports coordination by enabling the storage and ready transfer of knowledge. In contrast, another strand highlights the persistent differences between expert groups that create boundaries to the transfer of knowledge, seeing coordination as dependent on the quality of the reciprocal interactions between groups and individuals. Our research helps to resolve such contested understandings of the coordinative role played by codification. By focusing on the offshore-outsourcing of knowledge-intensive services, we examine the role played by codification when expertise was coordinated between client staff and onsite and offshore vendor personnel in a large-scale outsourcing contract between TATA Consultancy Services (TCS) and ABN AMRO bank. A number of theoretical contributions flow from our analysis of the case study, helping to move our understanding beyond the dichotomized views of codification outlined above. First, our study adds to previous work where codification has been seen as a static concept by demonstrating the multiple, coexisting, and complementary roles that codification may play. We examine the dynamic nature of codification and show changes in the relative importance of these different roles in coordinating distributed expertise over time. Second, we reconceptualize the commonly accepted view of codification as focusing on the replication and diffusion of knowledge by developing the notion of the codification of the “knower” as complementary to the codification of knowledge. Unlike previous studies of expertise directories, codification of the knower does not involve representing expertise in terms of occupational skills or competences but enables the reciprocal interrelating of expertise required by more unstructured tasks.

Strategic innovation through outsourcing:the role of relational and contractual governance

There is growing evidence that client firms expect outsourcing suppliers to transform their business. Indeed, most outsourcing suppliers have delivered IT operational and business process innovation to client firms; however, achieving strategic innovation through outsourcing has been perceived to be far more challenging. Building on the growing interest in the IS outsourcing literature, this paper seeks to advance our understanding of the role that relational and contractual governance plays in achieving strategic innovation through outsourcing. We hypothesized and tested empirically the relationship between the quality of client-supplier relationships and the likelihood of achieving strategic innovation, and the interaction effect of different contract types, such as fixed-price, time and materials, partnership and their combinations. Results from a pan-European survey of 248 large firms suggest that high-quality relationships between clients and suppliers may indeed help achieve strategic innovation through outsourcing. However, within the spectrum of various outsourcing contracts, only the partnership contract, when included in the client contract portfolio alongside either fixed-price, time and materials or their combination, presents a significant positive effect on relational governance and is likely to strengthen the positive effect of the quality of client-supplier relationships on strategic innovation.

A note on the propagation of quantized vortex rings through a quantum turbulence tangle:energy transport or energy dissipation?

We investigate quantum vortex ring dynamics at scales smaller than the inter-vortex spacing in quantum turbulence. Through geometrical arguments and high-resolution numerical simulations, we examine the validity of simple estimates for the mean free path and the structure of vortex rings post-reconnection. We find that a large proportion of vortex rings remain coherent objects where approximately 75% of their energy is preserved. This leads us to consider the effectiveness of energy transport in turbulent tangles. Moreover, we show that in low density tangles, appropriate for the ultra-quantum regime, ring emission cannot be ruled out as an important mechanism for energy dissipation. However at higher vortex line densities, typically associated with the quasi-classical regime, loop emission is expected to make a negligible contribution to energy dissipation, even allowing for the fact that our work shows rings can survive multiple reconnection events. Hence the Kelvin wave cascade seems the most plausible mechanism leading to energy dissipation

Elemzés vagy megérzés: a stratégiai döntéshozatal gyakorlata Californiában és Magyarországon = Analysis or Intuition: Strategic decision making in California and Hungary

Stratégiai döntéseket jellemzően a vállalatok felsővezetői, vezérigazgatók és elnökök hoznak. Ennek szellemében 40 felsővezetőt kérdeztünk két nagyon különböző régióban (Kaliforniában és Magyarországon) egy összehasonlító kutatás keretében. A két országban tizenkét válaszadó vezérigazgató, elnök, alelnök, vagy felelős vezető volt (rájuk, mint Vezetőkre hivatkoztunk), miközben nyolcan alapítói és többségi tulajdonosai voltak saját vállalkozásuknak (őket nevezzük Vállalkozóknak). A kutatás három területre irányult: 1) Hogyan hoznak döntéseket a felsővezetők a valóságban a világ e két különböző táján; 2) Mennyiben különböznek - ha egyáltalán különböznek - a Vállalkozók és a Vezetők az alkalmazott döntéshozatali közelítésmódot tekintve, amikor az analitikus gondolkodást az intuícióikkal kombinálják; 3) Mik a hasonlóságok és a különbségek a menedzsment képességekben és a döntéshozatali rutinokban a Vállalkozók és a Vezetők között a vizsgált menedzsment kultúrákban. = Strategic decision making is usually conducted by a firm’s top management, led by the CEO or the President of the company. In keeping with this, 40 top level managers in two very different regions (California, USA and Hungary) were targeted in a comparative research study. In the two countries, twelve of the managers were CEOs, Presidents, Vice Presidents or Chief Officers (hereafter referred to as Executives) while eight were founders and majority owners of their own enterprises (hereafter referred to as Entrepreneurs). The research focused on the following 3 areas: 1) How top level managers really make strategic decisions in these two different parts of the world; 2) How Entrepreneurs and Executives differ, if at all, in their approach to strategic decision making when they combine analytical thinking with their intuition; 3) The similarities and differences in management skills and decision making routines between Entrepreneurs and Executives within the investigated management cultures.

The effects of store atmosphere on shopping behaviour - A literature review.

This paper provides an insight into how the atmospherics of a retail environment influence shopping behaviour. Its objective is to support researchers and practitioners by summarizing the current state of knowledge and identifying gaps and avenues for future research. The scope covers studies in retail marketing and environmental psychology published during the last 35 years. It has been shown that environmental cues (music, scent etc.) have an effect on the emotional state of the consumer, which in turn causes behavioural changes, both positive (approach, buy more, stay longer etc.) and negative (not approach, buy less, leave earlier etc.). Most studies make reference to the PAD model, which proposes that the relevant emotions in this process can be measured along three dimensions Pleasure, Arousal and Dominance (Mehrabian, A. & Russell, J.A.,1974, An approach to environmental psychology, Cambridge, MA.: MIT Press). Since then, significant advances have been made to understand the effect of individual cues, their interaction, as well as the role of moderators, such as gender, age, or shopping motivation. However, there are a number of opportunities for further research. Too little is known about the moderating effects of Arousal and Dominance and how they interact with each other and with Pleasure dimension. Also a number of other moderators, such as gender and culture, should be integrated into the model.

Racionális és intuitív döntéshozók Kaliforniában és Magyarországon (Analysis or Intuition – Strategic decision making in California and Hungary)

Stratégiai döntéseket jellemzően a vállalatok felső vezetői, vezérigazgatók és elnökök hoznak. Ennek szellemében a szerző negyven felső vezetőt kérdezett meg két nagyon különböző régióban (Kaliforniában és Magyarországon) egy összehasonlító kutatás keretében. A két országban tizenkét válaszadó vezérigazgató, elnök, alelnök vagy felelős vezető volt (rájuk mint Vezetőkre hivatkoztunk), miközben nyolcan alapítói és többségi tulajdonosai voltak saját vállalkozásuknak (őket nevezzük Vállalkozóknak). A kutatás három területre irányult: 1) Hogyan hoznak döntéseket a felső vezetők a valóságban a világ e két különböző táján 2) Mennyiben különböznek – ha egyáltalán különböznek – a Vállalkozók és a Vezetők az alkalmazott döntéshozatali közelítésmódot tekintve, amikor az analitikus gondolkodást az intuícióikkal kombinálják 3) Mik a hasonlóságok és a különbségek a menedzsmentképességekben és a döntéshozatali rutinokban a Vállalkozók és a Vezetők között a vizsgált menedzsmentkultúrákban? ______ Strategic decision making is usually conducted by a firm’s top management, led by the CEO or the President of the company. In keeping with this, 40 top level managers in two very different regions (California, USA and Hungary) were targeted in a comparative research study. In the two countries, twelve of the managers were CEOs, Presidents, Vice Presidents or Chief Officers (hereafter referred to as Executives) while eight were founders and majority owners of their own enterprises (hereafter referred to as Entrepreneurs). The research focused on the following 3 areas: 1) How top level managers really make strategic decisions in these two different parts of the world; 2) How Entrepreneurs and Executives differ, if at all, in their approach to strategic decision making when they combine analytical thinking with their intuition; 3) The similarities and differences in management skills and decision making routines between Entrepreneurs and Executives within the investigated management cultures.

A temporary loss of pace or the "middle income trap" - a commentary on the tasks for Hungary's economic development

The latest Hungarian economic growth data, though favourable, do not let us forget that in the longer term growth is weak compared to the preceding period – as well as to the performance of the East-Central European region, which is more dynamic than the European average. In order to make sense of the past decade’s relative loss of pace and lay the foundations for future development policy, it is worth placing Hungary’s case in the context of the slowing tempo typical of middle-income countries. The economic development policies currently pursued by the government are aimed at increasing output in the processing industry, and by extension exports, while relevant international experience advises that it is the higher value-added activities of the global value chain, particularly business services, which should be developed further. In this way real wages and income levels could be increased, and the economy would be less exposed to the fluctuations of international cycles.

Alberto Girri, or poetry as hermeneutic reason

One of the main factors that makes the poetry of the Argentine Alberto Girri (1919–1991) a whole world of its own is my argument that in a fragmentary world like the present, poets search for a formal integrity which in the act of reading creates not only their own inner world but also the readers'. It is important to insist on this turning point in which most of the Symbolist work is circumscribed. Later, this would be of capital importance for the avant-garde as well as for the post-avant-garde: Mallarmé's Un coup de dés jamais n'abolira le hasard would make poetry something absolutely modern. An original distribution of the white and black opened a new space for the text, shifting the then dominant phonocentrism. My close reading of this author as well as the given theoretical frame avoids the failure into an instrumental use either of the page or of the writing but ignoring physical reciprocity. What follows is, that this “shift” privileged heightened vision over audition of the “musical score”. Thus, an intense materialization of the language is achieved that increases the anonymity of the text. ^ Following this new arrangement of words, so to speak, Girri's poetic work now drives deeply inside words in order to lend them dignity from meaning. I conclude that the best way to “render” this poetry with religious aim (L. “re-ligare” to bind the fragmented) is by way of the philosophy of language. I also propose that Girri's task as a translator, mainly from English poetry, represented—with Jorge Luis Borges—a paradigmatic shift in the Spanish American horizon which had been under “logocentric” French rule since the time of Independence. This seismic change of perspective in late Modernism and post-Modernism is represented by a radical screening of Romance rhetoric, it was a shift not only over the inherited mother tongue but over his own work which was increasingly moving towards transcendent and/or metaphysical poetry. ^ Therefore, I did find that Girri's poem was constructed as a mirror closely related to that which was represented in the angelological tradition. ^

Outsourcing Information Services in the Hospitality Industry

Outsourcing of informational services, a growing trend outside the hospitality industry for several years, is the process of contracting with an outside vendor to take over all or part of a company's information processing needs. The author examines the pros and cons of outscourcing to help the hospitality industry determine if this si a business practice to be considered.

Planning Buy-Sell Agreements In The Hospitality Industry

In the article - Planning Buy-Sell Agreements In The Hospitality Industry - by John M. Tarras, Assistant Professor, School of Hotel, Restaurant and Institutional Management at Michigan State University, the author initially observes: “The vast majority of hospitality firms (restaurants, hotels, etc.) would be considered closely-held corporations. As such, they have unique planning problems compared to large, publicly-traded hospitality firms. One area of special concern to the closely-held hospitality firm is the planning and adoption of a buy-sell agreement.” The above thesis statement outlines the heart of the article; the buy-sell agreement in regard to smaller [closely held, as Tarras calls them] corporations. The theory is narrow and pro-active, spanning the gap between personal-to-corporate stock manipulations. “The primary purpose of a buy-sell agreement is to contribute to the orderly transfer of a shareholder's stock in a hospitality firm upon some future incident [typically retirement, withdrawal of a shareholder, disability, or death], as Tarras defines the concept. “The hospitality firm or the other shareholders would be committed to purchase the departing shareholder's stock at an agreed upon price and method, and to ensure that ample cash will be obtainable for such an impending sale. The buy-sell agreement provides a market for the shareholder or the shareholder's estate for the sale of otherwise illiquid stock,” the author further provides as canons of buy-sell agreements. In defining the buy-sell agreement with restrictive clauses, Tarras demonstrates, “…many closely-held hospitality firms desire to limit ownership to those individuals, either family or principal corporate employees, who are essential to the well-being of the firm.” Tarras says, another element of the buy-sell agreement is to furnish the departing shareholder with liquidity. “…there typically is some form of cash down payment with the remainder denoted by an interest-bearing promissory note [usually 5 to 15 years],” he informs. “The departing shareholders may require that the hospitality firm pledge the assets of the firm and that the remaining shareholders personally guarantee the promissory note.” “…the most frequent reason for establishing buy-sell agreements is for estate planning purposes,” Tarras says. There are tax advantages and liabilities for both the seller and buyer of stock via the buy-sell agreement, and the author enumerates many of these. One, big advantage of the buy-sell agreement is that it provides for the running of the company with a minimum of disruption through the stock-cash transition process, Tarras offers.

Strategic positioning of Taiwan in the outsourcing market: Evidence from information technology services and electronic manufacturing outsourcing to China

In outsourcing relationships with China, the Electronic Manufacturing (EM) and Information Technology Services (ITS) industry in Taiwan may possess such advantages as the continuing growth of its production value, complete manufacturing supply chain, low production cost and a large-scale Chinese market, and language and culture similarity compared to outsourcing to other countries. Nevertheless, the Council for Economic Planning and Development of Executive Yuan (CEPD) found that Taiwan's IT services outsourcing to China is subject to certain constraints and might not be as successful as the EM outsourcing (Aggarwal, 2003; CEPD, 2004a; CIER, 2003; Einhorn and Kriplani, 2003; Kumar and Zhu, 2006; Li and Gao, 2003; MIC, 2006). Some studies examined this issue, but failed to (1) provide statistical evidence about lower prevalence rates of IT services outsourcing, and (2) clearly explain the lower prevalence rates of IT services outsourcing by identifying similarities and differences between both types of outsourcing contexts. This research seeks to fill that gap and possibly provide potential strategic guidelines to ITS firms in Taiwan. This study adopts Transaction Cost Economics (TCE) as the theoretical basis. The basic premise is that different types of outsourcing activities may incur differing transaction costs and realize varying degrees of outsourcing success due to differential attributes of the transactions in the outsourcing process. Using primary data gathered from questionnaire surveys of ninety two firms, the results from exploratory analysis and binary logistic regression indicated that (1) when outsourcing to China, Taiwanese firms' ITS outsourcing tends to have higher level of asset specificity, uncertainty and technical skills relative to EM outsourcing, and these features indirectly reduce firms' outsourcing prevalence rates via their direct positive impacts on transaction costs; (2) Taiwanese firms' ITS outsourcing tends to have lower level of transaction structurability relative to EM outsourcing, and this feature indirectly increases firms' outsourcing prevalence rates via its direct negative impacts on transaction costs; (3) frequency does influence firms' transaction costs in ITS outsourcing positively, but does not bring impacts into their outsourcing prevalence rates, (4) relatedness does influence firms' transaction costs positively and prevalence rates negatively in ITS outsourcing, but its impacts on the prevalence rates are not caused by the mediation effects of transaction costs, and (5) firm size of outsourcing provider does not affect firms' transaction costs, but does affect their outsourcing prevalence rates in ITS outsourcing directly and positively. Using primary data gathered from face-to-face interviews of executives from seven firms, the results from inductive analysis indicated that (1) IT services outsourcing has lower prevalence rates than EM outsourcing, and (2) this result is mainly attributed to Taiwan's core competence in manufacturing and management and higher overall transaction costs of IT services outsourcing. Specifically, there is not much difference between both types of outsourcing context in the transaction characteristics of reputation and most aspects of overall comparison. Although there are some differences in the feature of firm size of the outsourcing provider, the difference doesn't cause apparent impacts on firms' overall transaction costs. The medium or above medium difference in the transaction characteristics of asset specificity, uncertainty, frequency, technical skills, transaction structurability, and relatedness has caused higher overall transaction costs for IT services outsourcing. This higher cost might cause lower prevalence rates for ITS outsourcing relative to EM outsourcing. Overall, the interview results are consistent with the statistical analyses and provide support to my expectation that in outsourcing to China, Taiwan's electronic manufacturing firms do have lower prevalence rates of IT services outsourcing relative to EM outsourcing due to higher transaction costs caused by certain attributes. To solve this problem, firms' management should aim at identifying alternative strategies and strive to reduce their overall transaction costs of IT services outsourcing by initiating appropriate strategies which fit their environment and needs.

Branch and price solution approach for order acceptance and capacity planning in make -to -order operations

The increasing emphasis on mass customization, shortened product lifecycles, synchronized supply chains, when coupled with advances in information system, is driving most firms towards make-to-order (MTO) operations. Increasing global competition, lower profit margins, and higher customer expectations force the MTO firms to plan its capacity by managing the effective demand. The goal of this research was to maximize the operational profits of a make-to-order operation by selectively accepting incoming customer orders and simultaneously allocating capacity for them at the sales stage. ^ For integrating the two decisions, a Mixed-Integer Linear Program (MILP) was formulated which can aid an operations manager in an MTO environment to select a set of potential customer orders such that all the selected orders are fulfilled by their deadline. The proposed model combines order acceptance/rejection decision with detailed scheduling. Experiments with the formulation indicate that for larger problem sizes, the computational time required to determine an optimal solution is prohibitive. This formulation inherits a block diagonal structure, and can be decomposed into one or more sub-problems (i.e. one sub-problem for each customer order) and a master problem by applying Dantzig-Wolfe’s decomposition principles. To efficiently solve the original MILP, an exact Branch-and-Price algorithm was successfully developed. Various approximation algorithms were developed to further improve the runtime. Experiments conducted unequivocally show the efficiency of these algorithms compared to a commercial optimization solver.^ The existing literature addresses the static order acceptance problem for a single machine environment having regular capacity with an objective to maximize profits and a penalty for tardiness. This dissertation has solved the order acceptance and capacity planning problem for a job shop environment with multiple resources. Both regular and overtime resources is considered. ^ The Branch-and-Price algorithms developed in this dissertation are faster and can be incorporated in a decision support system which can be used on a daily basis to help make intelligent decisions in a MTO operation.^

Tubular and sector heat pipes with interconnected branches for gas turbine and/or compressor cooling

Designing turbines for either aerospace or power production is a daunting task for any heat transfer scientist or engineer. Turbine designers are continuously pursuing better ways to convert the stored chemical energy in the fuel into useful work with maximum efficiency. Based on thermodynamic principles, one way to improve thermal efficiency is to increase the turbine inlet pressure and temperature. Generally, the inlet temperature may exceed the capabilities of standard materials for safe and long-life operation of the turbine. Next generation propulsion systems, whether for new supersonic transport or for improving existing aviation transport, will require more aggressive cooling system for many hot-gas-path components of the turbine. Heat pipe technology offers a possible cooling technique for the structures exposed to the high heat fluxes. Hence, the objective of this dissertation is to develop new radially rotating heat pipe systems that integrate multiple rotating miniature heat pipes with a common reservoir for a more effective and practical solution to turbine or compressor cooling. In this dissertation, two radially rotating miniature heat pipes and two sector heat pipes are analyzed and studied by utilizing suitable fluid flow and heat transfer modeling along with experimental tests. Analytical solutions for the film thickness and the lengthwise vapor temperature distribution for a single heat pipe are derived. Experimental tests on single radially rotating miniature heat pipes and sector heat pipes are undertaken with different important parameters and the manner in which these parameters affect heat pipe operation. Analytical and experimental studies have proven that the radially rotating miniature heat pipes have an incredibly high effective thermal conductance and an enormous heat transfer capability. Concurrently, the heat pipe has an uncomplicated structure and relatively low manufacturing costs. The heat pipe can also resist strong vibrations and is well suited for a high temperature environment. Hence, the heat pipes with a common reservoir make incorporation of heat pipes into turbo-machinery much more feasible and cost effective.

Branch and Price Solution Approach for Order Acceptance and Capacity Planning in Make-to-Order Operations

The increasing emphasis on mass customization, shortened product lifecycles, synchronized supply chains, when coupled with advances in information system, is driving most firms towards make-to-order (MTO) operations. Increasing global competition, lower profit margins, and higher customer expectations force the MTO firms to plan its capacity by managing the effective demand. The goal of this research was to maximize the operational profits of a make-to-order operation by selectively accepting incoming customer orders and simultaneously allocating capacity for them at the sales stage. For integrating the two decisions, a Mixed-Integer Linear Program (MILP) was formulated which can aid an operations manager in an MTO environment to select a set of potential customer orders such that all the selected orders are fulfilled by their deadline. The proposed model combines order acceptance/rejection decision with detailed scheduling. Experiments with the formulation indicate that for larger problem sizes, the computational time required to determine an optimal solution is prohibitive. This formulation inherits a block diagonal structure, and can be decomposed into one or more sub-problems (i.e. one sub-problem for each customer order) and a master problem by applying Dantzig-Wolfe’s decomposition principles. To efficiently solve the original MILP, an exact Branch-and-Price algorithm was successfully developed. Various approximation algorithms were developed to further improve the runtime. Experiments conducted unequivocally show the efficiency of these algorithms compared to a commercial optimization solver. The existing literature addresses the static order acceptance problem for a single machine environment having regular capacity with an objective to maximize profits and a penalty for tardiness. This dissertation has solved the order acceptance and capacity planning problem for a job shop environment with multiple resources. Both regular and overtime resources is considered. The Branch-and-Price algorithms developed in this dissertation are faster and can be incorporated in a decision support system which can be used on a daily basis to help make intelligent decisions in a MTO operation.