Searching for Bayesian Network Structures in the Space of Restricted Acyclic Partially Directed Graphs

Although many algorithms have been designed to construct Bayesian network structures using different approaches and principles, they all employ only two methods: those based on independence criteria, and those based on a scoring function and a search procedure (although some methods combine the two). Within the score+search paradigm, the dominant approach uses local search methods in the space of directed acyclic graphs (DAGs), where the usual choices for defining the elementary modifications (local changes) that can be applied are arc addition, arc deletion, and arc reversal. In this paper, we propose a new local search method that uses a different search space, and which takes account of the concept of equivalence between network structures: restricted acyclic partially directed graphs (RPDAGs). In this way, the number of different configurations of the search space is reduced, thus improving efficiency. Moreover, although the final result must necessarily be a local optimum given the nature of the search method, the topology of the new search space, which avoids making early decisions about the directions of the arcs, may help to find better local optima than those obtained by searching in the DAG space. Detailed results of the evaluation of the proposed search method on several test problems, including the well-known Alarm Monitoring System, are also presented

Analisis Faktor – Faktor Yang Mempengaruhi Kepuasan Dan Word Of Mouth Yang Positif Pada Pelanggan Telkom Speedy Di Kota Manado

Word-of-mouth phenomenon in the last decade can not be avoided by marketers, because its existence can carry a positive or negative image of one brand of product or service. The data analysis in this study uses the PATH analysis using the analysis tool SPSS (Statistical Package for Social Sciences). The test results showed that the Product Quality and Service Quality in the process eliminated the t test because it has a low impact on customer satisfaction. Competitive prices have a dominant influence on Customer Satisfaction. Similarly, the effect of Customer Satisfaction on Word Of Mouth is the value of positive significance. This means that the higher the price is competitive assessment of customer owned, the higher the customer satisfaction of the Speedy and the higher the resulting effect of Word Of Mouth. Keywords: product quality, service quality, customer satisfaction, and word of mout

A multi-layered Bayesian network model for structured document retrieval

New standards in document representation, like for example SGML, XML, and MPEG-7, compel Information Retrieval to design and implement models and tools to index, retrieve and present documents according to the given document structure. The paper presents the design of an Information Retrieval system for multimedia structured documents, like for example journal articles, e-books, and MPEG-7 videos. The system is based on Bayesian Networks, since this class of mathematical models enable to represent and quantify the relations between the structural components of the document. Some preliminary results on the system implementation are also presented

Puesta en marcha de la técnica instrucción entre iguales en un curso de fundamentos de programación

En este artículo se fundamenta la técnica de intrucción entre iguales y se describen los pasos llevados a cabo para su aplicación en una asignatura de programación de segundo cuatrimestre, en el curso actual 2021-2022. La descripción incluye una temporización de la actividad, se dan detalles de su implementación en el aula y se enumeran posibles beneficios.The paper outlines the peer instruction and describes the prepations followed for its application on a course of programming in the second semestre of the current academic year 2021-2022. The description includes the timing of the activities, some details of the implementation in the classroom and a series of possible benefits

Ranking structured documents using utility theory in the Bayesian network retrieval model

In this paper a new method based on Utility and Decision theory is presented to deal with structured documents. The aim of the application of these methodologies is to refine a first ranking of structural units, generated by means of an Information Retrieval Model based on Bayesian Networks. Units are newly arranged in the new ranking by combining their posterior probabilities, obtained in the first stage, with the expected utility of retrieving them. The experimental work has been developed using the Shakespeare structured collection and the results show an improvement of the effectiveness of this new approach

PEMBUATAN ASAM OKSALAT DARI KULIT SINGKONG DENGAN VARIASI KONSENTRASI HNO3 DAN LAMA PEMANASAN PADA PROSES HIDROLISIS

MAKING OF OXALIC ACID FROM CASSAVA PEEL WITH VARIATION CONCENTRATION OF NITRIC ACID AND TIME OF HYDROLYSIS PROCESS Dessy Ratnasari, 58 Pages, 12 Tables, and 18 Pictures 4 Attachments The purposes of these research are to produce oxalic acid from cassava peel. The material of this research is cassava peel, because cassava peel contains carbohydrate. The method of this research is oxidation carbohydrate with nitric acid. The oxidation process with nitric acid, matters the contain carbohydrate changed to oxalic acid. The oxidation carbohydrate with nitric acid produce oxalic acid that high purity. The research use variation time of reaction are 40 minutes, 60 minutes and 80 minutes, temperature constant control 75oC, the concentration of nitric acid are 40%, 50% and 60%. The best result of this research from 25 gr cassava peel produce 5,58 gr oxalic acid has 31,11 % yield, by using 60% nitric acid, time of reaction 80 minutes. The influence from the concentrations of nitric acid and time of reaction is higher concentration of nitric acid and time of reaction, so the product will be increase. The quality of oxalic acid has melting point 101,5 oC, dissolve in the water (20oC) and density 1,310 gr/ml. Oxalic acid has white colour crystals