An efficient approach to measure the difficulty degree of practical programming exercises based on student performances

oai:ojs.www.rev-jec.org:article/282This study examines the generality of easy to hard practice questions in programming subjects. One of the most important contributions is to propose four new formulas for determining the difficulty degree of questions. These formulas aim to describe different aspects of difficulty degree from the learner's perspective instead of the instructor's subjective opinions. Then, we used clustering technique to group the questions into three easy, medium and difficult degrees. The results will be the baseline to consider the generality of the exercise sets according to each topic. The proposed solution is then tested on the data set that includes the results of the two subjects: Programming Fundamentals, Data Structures and Algorithms from Ho Chi Minh City University of Technology. The most important result is to suggest the instructors complete various degrees according to each topic for better evaluating student's performance

INVESTIGATION OF THE ANTIBIOTIC RESISTANCE: THE CASE OF BUU DIEN GENERAL HOSPITAL IN HO CHI MINH CITY

Objective: In Vietnam, antibiotic resistance has been gained the attention of medical professionals in antibiotic use management. This study aimed to investigate the antibiotic resistance among hospital-acquired infections at Buu Dien General Hospital in Ho Chi Minh City in the period of 01-12/2017. Methods: This cross-sectional descriptive study was conducted on the retrospective data of all antibiograms of bacteria isolated from hospital-acquired infections at Buu Dien General Hospital in Ho Chi Minh City in the period of 01-12/2017 to investigate the antibiotic resistance. Characteristics of antibiotic resistance were described by frequency and percentage of types of bacteria isolated and antibiotics being resistant. Results: A total of 179 isolates were collected during the period 01-12/2017, of which E. coli was the most commonly isolated pathogen (41.3%). The highest prevalent infections were in the skin and mucosa; respiratory tract; and urinary tract (34.6%; 32.4%; and 27.9%). The antibiotic susceptibility testing used 21 types of antibiotics. Among them, S. aureus was 82% resistant to clindamycin and 75% resistant to cefuroxime; the Proteus resistance percentages to amoxicillin/clavulanic, second-generation cephalosporins, ciprofloxacin and fosfomycin varied from 50 to 93%; Pseudomonas was 92% resistant to fosfomycin and 62% resistant to ceftazidime; A. baumannii was resistant to most classes of agents used (50-75%). Both E. coli and Klebsiella were highly resistant to gentamicin, amoxicillin, ciprofloxacin, 2nd and 3rd generation cephalosporin’s. Polymyxin B-resistant Proteus cultures were detected at 67%. Conclusion: The study described the antibiotic resistance situation of hospital-acquired bacteria at the Buu Dien General Hospital from 01-12/2017. This information will aid physicians to select proper antibiotics for their patients in the next period

FREQUENCY OPTIMIZATION AND TRANSIENT ANALYSES OF STIFFENED FOLDED LAMINATE COMPOSITE PLATE USING GENETIC ALGORITHM

In  this  study,  frequency  optimization  of  stiffened  folded  laminate  composite  plate  is investigated with  respect  to  fiber orientations by using genetic algorithm  (GA). The first order shear deformation theory was used for direct frequencies calculations. The Matlab programming using rectangular isoparametric plate element with five degrees of freedom per node was built to solve  the  problems. The modulus  of  selection,  crossover  and mutation were  used  as  standard sub-modulus.  The  effects  of  obtained  optimal  fiber  orientation  on  transient  response  of  the folded plate have been investigated with difference boundary conditions. A good agreement was found between the results of this technique and other published results available in the literature

Bending and vibration analysis of multi-folding laminate composite plate using finite element method

This paper deals with the bending and vibration analysis of multi-folding laminate composite plate using finite element method based on the first order shear deformation theory (FSDT). The algorithm and Matlab code using eight nodded rectangular isoparametric plate element with five degrees of freedom per node were built for numerical simulations. In the numerical results, the effect of folding angle on deflections, natural frequencies and transient displacement response for different boundary conditions of the plate were investigated

A new record of congrid eel, Bathycongrus bleekeri (Congridae) from Vietnam

Three specimens of Bathycongrus bleekeri were collected during the survey in 2015 and 2017. The newly recorded species is described herein, a small, moderately elongate species of Bathycongrus with head and body compressed; vertical fins without black mark; tail slender, attenuated, but not filiform; trunk length 1.2 times greater than head length; teeth small, conical, in about three-four rows on jaws, in a small triangular patch on vomer; 28–29 preanal vertebrae, total of 111–113 vertebrae; 26–28 preanal lateral-line pores. Additional data on the morphology and distribution of the species increases the total number of known species in the family Congridae in Vietnamese waters to twelve

Risk Management at Military Commercial Joint Stock Bank in Vietnam

This research is conducted for examining the framework for risk management in the Basel II accord, the Basel II risk management model at the Military Commercial Joint Stock Bank. Data were collected from annual reports for the period from 2015 to 2017 of the Military Commercial Joint Stock Bank. The results show that the implementation of risk management under Basel II at Military Bank still faces many difficulties in the pressure of capital increase, database system, human resource quality, and cost of implementation. The study suggest some solutions for Military Bank to implement successfully Basel II, emphasizing the role of human resource quality, modernizing the data system and the specific mechanism for raising capital. The results of this research is a reference for Vietnamese commercial banks in identifying, controlling and responding various risks in banking activities in the context of Vietnam. Keywords: Basel II, Risk management, Military Bank DOI: 10.7176/RJFA/10-12-06 Publication date:June 30th 201

Microfluidic Chip for Trapping Magnetic Nanoparticles and Heating in Terms of Biological Analysis

In this study, we reported the results of the design and the fabrication a planar coil in copper (square, a = 10 mm, 15mm high, 90 turns), these planar coils were integrated in a microfluidic chip for trapping magnetic nanoparticles and local heating applications. A small thermocouple (type K, 1 mm tip size) was put directly on top of the micro-channel in poly(dimethyl-siloxane) in order to measure the temperature inside the channel during applying current. The design of planar coils was based on optimizing the results of the magnetic calculation. The most suitable value of the magnetic field generated by the coil was calculated by ANSYS® software corresponded to the different distances from the coil surface to the micro-channel bottom (magnetic field strength Hmax = 825 A/m). The magnetic filed and heating relationship was balanced in order to manipulating the trapping magnetic nanoparticles and heating process. This design of the microfluidic chip can be used to develop a complex microfluidic chip using magnetic nanoparticles

Challenges in Employing BASEL II at Military Commercial Joint Stock Bank

This paper is conducted for examining the framework for risk management in the Basel II accord, the Basel II risk management model at the Military Commercial Joint Stock Bank. Data were collected from annual reports for the period from 2015 to 2017 of the Military Commercial Joint Stock Bank. The results show that the implementation of risk management under Basel II at Military Bank still faces many difficulties in the pressure of capital increase, database system, human resource quality, and cost of implementation. The study suggests some solutions for Military Bank to implement successfully Basel II, emphasizing the role of human resource quality, modernizing the data system and the specific mechanism for raising capital. The results of this research is a reference for Vietnamese commercial banks in identifying, controlling and responding various risks in banking activities in the context of Vietnam in particular and in emerging countries in general. Keywords: Basel II, Risk management, Military Ban