The prevalence of high dysplastic colonic adenomatous polyps in a 3 year endoscopic retrospective study from a single clinical center

Introduction: Many colon neoplastic tumors come from the malignancy of adenomatous polyps (70%-90%) that were not timely diagnosed in order to be resected. Materials and Methods: We conducted a retrospective study regarding the incidence of adenomatous polyps during 1.000 consecutive colonoscopies performed in our Upper and Lower Digestive Endoscopy Laboratory during a three-year period. Results: During these colonoscopies, some targeted polyps were biopsied or completely removed and the samples had been sent to a complete anatomopathological examination. Taking into consideration the results, the polyps were classified after the histological type and the form of dysplasia, in order to determine the polyp forms that present a high risk of malignancy. Conclusion: Given the rather high frequency of malignant polyps discovered during our study, we highly recommend colonoscopy as a method of choice for routine monitoring of selected cases

Multidimensional patterns of neuronal activity: how do we see them?

Poster presentation: Introduction The brain is a highly interconnected network of constantly interacting units. Understanding the collective behavior of these units requires a multi-dimensional approach. The results of such analyses are hard to visualize and interpret. Hence tools capable of dealing with such tasks become imperative. ...

Preference-Based Characterizations of Truthfulness and the Limited Expressiveness of Order-Based Domains

An important direction in computational mechanism design is to characterize the space of choice functions that can be truthfully implemented. For this, one must carefully describe the class of preferences in a domain. For unrestricted preferences the domain is well-characterized, and small. Moreover, recent work [Lavi et al., 2003] has allowed for “order-based” preferences but found essentially the same (negative) characterization. However, most interesting domains have preferences that are still more structured than those allowed in the orderbased model. We highlight this issue in our paper, through many examples, thus demonstrating the limited applicability of this result. We propose extensions to the model of order-based domains to capture new preference structure, and conjecture that more positive characterizations for truthfulness are possible. We also advocate, in proposing a research direction for sufficient conditions for truthfulness, that attention be restricted to natural (critical-value based) payment functions.Engineering and Applied Science

On Revenue-Optimal Dynamic Auctions for Bidders with Interdependent Values

In a dynamic market, being able to update one’s value based on information available to other bidders currently in the market can be critical to having profitable transactions. This is nicely captured by the model of interdependent values (IDV): a bidder’s value can explicitly depend on the private information of other bidders. In this paper we present preliminary results about the revenue properties of dynamic auctions for IDV bidders. We adopt a computational approach to design single-item revenue-optimal dynamic auctions with known arrivals and departures but (private) signals that arrive online. In leveraging a characterization of truthful auctions, we present a mixed-integer programming formulation of the design problem. Although a discretization is imposed on bidder signals the solution is a mechanism applicable to continuous signals. The formulation size grows exponentially in the dependence of bidders’ values on other bidders’ signals. We highlight general properties of revenue-optimal dynamic auctions in a simple parametrized example and study the sensitivity of prices and revenue to model parameters.Engineering and Applied Science

The effects of ISO 9001 quality management system on innovation and management capacities in the Malaysian furniture sector.

Although the ISO 9001 quality management system is often perceived to be a marketing tool within the manufacturing industry, its implications on the innovation and management capacities of the furniture industry remain unknown. A survey of furniture manufacturers in Malaysia revealed that lack of innovation and ineffective management were among the main problems faced within the industry. Using a structured questionnaire, a survey of the ISO-certified manufacturers revealed that the ISO 9001 quality management system has a positive correlation on process innovation but not on product innovation. Therefore, ISO-certification would be beneficial for productivity improvement and identifying cost-cutting measures in furniture manufacturing enterprises. On the other hand, ISO-certification has a significant influence on the management of furniture enterprises, especially with regards to systematic decision-making and boosting the level of professionalism. Therefore, ISO-certification may be a useful tool to enhance the management competency and also improve the productivity within the furniture manufacturing sector

Online Auctions for Bidders with Interdependent Values

Interdependent values (IDV) is a valuation model allowing bidders in an auction to express their value for the item(s) to sell as a function of the other bidders' information. We investigate the incentive compatibility (IC) of single-item auctions for IDV bidders in dynamic environments. We provide a necessary and sufficient characterization for IC in this setting. We show that if bidders can misreport departure times and private signals, no reasonable auction can be IC. We present a reasonable IC auction for the case where bidders cannot misreport departures.Engineering and Applied Science