Fast Conditional Independence-based Bayesian Classifier

Junior, Estevam R. Hruschka,Galvao, Sebastian D. C. de O. Korean Institute of Information Scientists and Eng 2007 Journal of Computing Science and Engineering Vol.1 No.2

Machine Learning (ML) has become very popular within Data Mining (KDD) and Artificial Intelligence (AI) research and their applications. In the ML and KDD contexts, two main approaches can be used for inducing a Bayesian Network (BN) from data, namely, Conditional Independence (CI) and the Heuristic Search (HS). When a BN is induced for classification purposes (Bayesian Classifier - BC), it is possible to impose some specific constraints aiming at increasing the computational efficiency. In this paper a new CI based approach to induce BCs from data is proposed and two algorithms are presented. Such approach is based on the Markov Blanket concept in order to impose some constraints and optimize the traditional PC learning algorithm. Experiments performed with the ALARM, as well as other six UCI and three artificial domains revealed that the proposed approach tends to execute fewer comparison tests than the traditional PC. The experiments also show that the proposed algorithms produce competitive classification rates when compared with both, PC and Naive Bayes.

Comparison of Cationic Flocculants for the Clarification of CHO-derived Monoclonal Antibodies

Rimenys Junior Carvalho 한국생물공학회 2019 Biotechnology and Bioprocess Engineering Vol.24 No.5

This work used two different cationic polyelectrolytes as flocculation agents for the clarification of growth medium from Chinese hamster ovary (CHO) monoclonal antibodies (mAb)-producing cells, namely chitosan and poly diallyldimethylammonium chloride (pDADMAC). The conditions set for the use of pDADMAC consisted in the variation of the polymer’s concentrations, in light of largely available literature. Chitosan was applied to a broader concentration-range under two different pH values, for its use in CHO cells flocculation is unprecedented in the literature. Chitosan presented the best performance on clarification assays under a concentration 9-fold lower compared with pDADMAC (5 pg/total cell (TC) and 45 pg/TC, respectively), albeit both agents provided similar results regarding sedimentation rates (15min), DNA removal (98%), and mAb recovery (90%). Despite the expected low proteins removal, namely 11.1% in the case of chitosan and no removal for pDADMAC, the flocculation technique proved to be cost-effective. Hence, its application can be envisioned not only when the clarification of a growth medium from CHO cells production is considered, but also for the removal of soluble impurities in a single step.

Facilitating Conditions in Adopting Big Data Analytics at Medical Aid Organizations in South Africa

VELA, Junior Vela,SUBRAMANIAM, Prabhakar Rontala,OFUSORI, Lizzy Oluwatoyin Korea Distribution Science Association 2022 The Journal of Industrial Distribution & Business( Vol.13 No.11

Purpose: This study measures the influence of facilitating conditions on employees' attitudes towards the adoption of big data analytics by selected medical aid organizations in Durban. In the health care sector, there are various sources of big data such as patients' medical records, medical examination results, and pharmacy prescriptions. Several organizations take the benefits of big data to improve their performance and productivity. Research design, data, and methodology: A survey research strategy was conducted on some selected medical aid organizations. A non-probability sampling and the purposive sampling technique were adopted in this study. The collected data was analysed using version 23 of Statistical Package for Social Science (SPSS) Results: the results show that the "facilitating conditions" have a positive influence on employees' attitudes in the adoption of big data analytics Conclusions: The findings of this study provide empirical and scientific contributions of the facilitating conditions issues regarding employee attitudes toward big data analytics adoption. The findings of this study will add to the body of knowledge in this field and raise awareness, which will spur further research, particularly in developing countries.

On the Use of Maximum Likelihood and Input Data Similarity to Obtain Prediction Intervals for Forecasts of Photovoltaic Power Generation

Fonseca Junior, Joao Gari da Silva,Oozeki, Takashi,Ohtake, Hideaki,Takashima, Takumi,Kazuhiko, Ogimoto The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.3

The objective of this study is to propose a method to calculate prediction intervals for one-day-ahead hourly forecasts of photovoltaic power generation and to evaluate its performance. One year of data of two systems, representing contrasting examples of forecast’ accuracy, were used. The method is based on the maximum likelihood estimation, the similarity between the input data of future and past forecasts of photovoltaic power, and on an assumption about the distribution of the error of the forecasts. Two assumptions for the forecast error distribution were evaluated, a Laplacian and a Gaussian distribution assumption. The results show that the proposed method models well the photovoltaic power forecast error when the Laplacian distribution is used. For both systems and intervals calculated with 4 confidence levels, the intervals contained the true photovoltaic power generation in the amount near to the expected one.

Association of sericin and swimming on the phenotype, motor plate, and functionality of the denervated plantar muscle of Wistar rats

André Junior Santana,Jean Carlos Debastiani,Regina Inês Kunz,Pamela Buratti,Rose Meire Costa Brancalhão,Lucinéia de Fátima Chasko Ribeiro,Márcia Miranda Torrejais,Gladson Ricardo Flor Bertolini 한국운동재활학회 2018 JER Vol.14 No.1

Physical exercise may help maintain muscle properties and functional improvement after peripheral nerve lesion, which may be enhanced by using biocompatible substances, such as sericin. The aim of this study was analyse the effect of sericin associated with swimming exercise on the phenotype, innervation, and functionality of the plantar muscle of Wistar rats. Forty randomly divided adult rats were used in five groups of eight animals: control, injury, sericin, exercise, exercise and sericin. The application of sericin was done on the spot, 100 μL, shortly after nerve compression. Three days after sciatic nerve compression, the swimming and swimming and sericin groups were submitted to physical swimming exercise for 21 days. Afterwards, the animals were euthanised and the plantar muscle was dissected and submitted to histochemical and histoenzymological techniques. The grip strength test did not show alterations in muscular functionality, and the control presented greater muscle mass in relation to the other groups, the same did not occur for muscle length. Polymorphic neuromuscular junctions were detected in the groups, although without significant morphometric alterations of the area, major and minor diameters. The percentage of type I fibres was lower in the lesion group and there was no difference in fibres IIa and IIb between groups. The area of fibres I, IIa and IIb remained constant between groups. Sericin biopolymer combined with swimming exercise did not affect plantar muscle function, submitted to experimental axonotmosis, whose contractile properties were altered by nerve injury.

Influence of receiver bandwidth on MRI artifacts caused by orthodontic brackets composed of different alloys

Abdala-Junior Reinaldo,No-Cortes Juliana,Arita Emiko Saito,Ackerman Jerome L.,da Silva Renan Lúcio Berbel,Kim Jun Ho,Cortes Arthur Rodriguez Gonzalez 대한영상치의학회 2021 Imaging Science in Dentistry Vol.51 No.4

Purpose: The aim of this in vitro study was to assess the role of bandwidth on the area of magnetic resonance imaging (MRI) artifacts caused by orthodontic appliances composed of different alloys, using different pulse sequences in 1.5 T and 3.0 T magnetic fields. Materials and Methods: Different phantoms containing orthodontic brackets (ceramic, ceramic bracket with a stainless-steel slot, and stainless steel) were immersed in agar gel and imaged in 1.5 T and 3.0 T MRI scanners. Pairs of gradient-echo (GE), spin-echo (SE), and ultrashort echo time (UTE) pulse sequences were used differing in bandwidth only. The area of artifacts from orthodontic devices was automatically estimated from pixel value thresholds within a region of interest (ROI). Mean values for similar pulse sequences differing in bandwidth were compared at 1.5 T and 3.0 T using analysis of variance. Results: The comparison of groups revealed a significant inverse association between bandwidth values and artifact areas of the stainless-steel bracket and the self-ligating ceramic bracket with a stainless-steel slot (P<0.05). The areas of artifacts from the ceramic bracket were the smallest, but were not reduced significantly in pulse sequences with higher bandwidth values (P<0.05). Significant differences were also observed between 1.5 T and 3.0 T MRI using SE and UTE, but not using GE 2-dimensional or 3-dimensional pulse sequences. Conclusion: Higher receiver bandwidth might be indicated to prevent artifacts from orthodontic appliances in 1.5 T and 3.0 T MRI using SE and UTE pulse sequences.

Regional (dis)integration beyond governments: A comparison in social and civil society participation between Mercosur and SADC

Ramanzini Junior Haroldo,Theodoro Luciano Bruno 한국외국어대학교 국제지역연구센터 2021 International Area Studies Review Vol.24 No.1

The aim of this article is to analyse the involvement of civil society in regional integration organizations through a comparative analysis of social/civil society channels in the Southern Common Market (Mercosur) and the Southern African Development Community (SADC). We seek to analyse the level of openness and the trajectory of both blocs in relation to civil society participation. The instruments and strategies employed by civil society actors in both regions are contrasted, aiming to understand how prominent and successful they have been in terms of influencing the decision-making processes of Mercosur and the SADC, which have been traditionally marked by their intergovernmental and interpresidential characters. We argue that civil society involvement in regionalism is shaped by regional institutional design, member states’ support for societal participation and civil society resources. Thus, this article seeks to contribute to the comparative regionalism literature, setting out an analytical comparative framework for assessing the role of civil society in regional organizations from the Global South.

Influence of receiver bandwidth on MRI artifacts caused by orthodontic brackets composed of different alloys

Abdala-Junior, Reinaldo,No-Cortes, Juliana,Arita, Emiko Saito,Ackerman, Jerome L.,da Silva, Renan Lucio Berbel,Kim, Jun Ho,Cortes, Arthur Rodriguez Gonzalez Korean Academy of Oral and Maxillofacial Radiology 2021 Imaging Science in Dentistry Vol.51 No.-

Purpose: The aim of this in vitro study was to assess the role of bandwidth on the area of magnetic resonance imaging (MRI) artifacts caused by orthodontic appliances composed of different alloys, using different pulse sequences in 1.5 T and 3.0 T magnetic fields. Materials and Methods: Different phantoms containing orthodontic brackets (ceramic, ceramic bracket with a stainless-steel slot, and stainless steel) were immersed in agar gel and imaged in 1.5 T and 3.0 T MRI scanners. Pairs of gradient-echo (GE), spin-echo (SE), and ultrashort echo time (UTE) pulse sequences were used differing in bandwidth only. The area of artifacts from orthodontic devices was automatically estimated from pixel value thresholds within a region of interest (ROI). Mean values for similar pulse sequences differing in bandwidth were compared at 1.5 T and 3.0 T using analysis of variance. Results: The comparison of groups revealed a significant inverse association between bandwidth values and artifact areas of the stainless-steel bracket and the self-ligating ceramic bracket with a stainless-steel slot(P<0.05). The areas of artifacts from the ceramic bracket were the smallest, but were not reduced significantly in pulse sequences with higher bandwidth values(P<0.05). Significant differences were also observed between 1.5 T and 3.0 T MRI using SE and UTE, but not using GE 2-dimensional or 3-dimensional pulse sequences. Conclusion: Higher receiver bandwidth might be indicated to prevent artifacts from orthodontic appliances in 1.5 T and 3.0 T MRI using SE and UTE pulse sequences.

Chewing gum as a non-pharmacological alternative for orthodontic pain relief: A randomized clinical trial using an intention-to-treat analysis

Diego Junior da Silva Santos,Jonas Capelli Jr. 대한치과교정학회 2021 대한치과교정학회지 Vol.51 No.5

Objective: To compare the effectiveness of ibuprofen, acetaminophen, and chewing gum for orthodontic pain relief and to assess if chewing gum can be a non-pharmacological alternative for orthodontic pain relief. Methods: The study enrolled 106 patients of both sexes, aged ≥ 12 years, with body weight > 50 kg, and mild-to-moderate dental crowding in the upper arch. After randomization and allocation concealment, the intervention groups were either administered with ibuprofen (400 mg) or acetaminophen (500 mg) or chewed sugar-free chewing gum immediately after initial archwire placement and every 6 hours for 1 week if the pain persisted. The control group did not receive any pain relief. The pain was assessed on a 100-mm visual analog scale at rest and while biting down at T1 (2 hours), T2 (24 hours), T3 (2 days), T4 (3 days), T5 (7 days), and T6 (21 days). Statistical analyses were performed using the Kruskal–Wallis and post-hoc Mann–Whitney U tests (α = 0.05). Results: The chewing gum group experienced more pain relief than the ibuprofen group at while biting down at T3 (p = 0.04) and at rest at T4 (p < 0.001). The chewing gum group reported more pain relief than the acetaminophen and control groups while biting down at T3 (p = 0.03 and p = 0.0006, respectively) and T4 (both p < 0.001). Conclusions: Chewing gum can be a non-pharmacological alternative for orthodontic pain relief at 2 and 3 days after initial archwire placement.

Determining the Optimal Number of Signal Clusters Using Iterative HMM Classification

Duker Ernest Junior,Yoon Joong Kim 한국인터넷방송통신학회 2018 Journal of Advanced Smart Convergence Vol.7 No.2

In this study, we propose an iterative clustering algorithm that automatically clusters a set of voice signal data without a label into an optimal number of clusters and generates hmm model for each cluster. In the clustering process, the likelihood calculations of the clusters are performed using iterative hmm learning and testing while varying the number of clusters for given data, and the maximum likelihood estimation method is used to determine the optimal number of clusters. We tested the effectiveness of this clustering algorithm on a small-vocabulary digit clustering task by mapping the unsupervised decoded output of the optimal cluster to the ground-truth transcription, we found out that they were highly correlated.