An improved algorithm to minimize the total completion time in a two-machine no-wait flow-shop with uncertain setup times

Since scheduling literature has a wide range of uncertainties, it is crucial to take these into account when solving performance measure problems. Otherwise, the performance may severely be affected in a negative way. In this paper, an algorithm is proposed to minimize the total completion time (TCT) of a two-machine no-wait flowshop with uncertain setup times within lower and upper bounds. The results are compared to the best existing algorithm in scheduling literature: the programming language Python is used to generate random samples with respect to various distributions, and the TCT of the proposed algorithm is compared to that of the best existing one. Results reveal that the proposed one significantly outperforms the best one given in literature for all considered distributions. Specifically, the average percentage improvement of the proposed algorithm over the best existing one is over 90%. A test of hypothesis is conducted to further confirm the results.

An algorithm for a no-wait flowshop scheduling problem for minimizing total tardiness with a constraint on total completion time

We consider a no-wait m-machine flowshop scheduling problem which is common in different manufacturing industries such as steel, pharmaceutical, and chemical. The objective is to minimize total tardiness since it minimizes penalty costs and loss of customer goodwill. We also consider the performance measure of total completion time which is significant in environments where reducing holding cost is important. We consider both performance measures with the objective of minimizing total tardiness subject to the constraint that total completion time is bounded. Given that the problem is NP-hard, we propose an algorithm. We conduct extensive computational experiments to compare the performance of the proposed algorithm with those of three well performing benchmark algorithms in the literature. Computational results indicate that the proposed algorithm reduces the error of the best existing benchmark algorithm by 88% under the same CPU times. The results are confirmed by extensive statistical analysis. Specifically, ANOVA analysis is conducted to justify the difference between the performances of the algorithms, and a test of hypothesis is performed to justify that the proposed algorithm is significantly better than the best existing benchmark algorithm with a significance level of 0.01.

THE USE OF CARTOON VIDEO IN TEACHING STUDENTS VOCABULARY

<p>This paper aims to discuss vocabulary and cartoon video, and how to teach vocabulary by using cartoon video. Cartoons are designed not only to entertain children, but cartoons can be also used to teach and educate children. In order to find the relationship between cartoon and education, the writer writes a paper which the title is “The Use of Cartoon in Teaching Students Vocabulary”. It has a purpose to help children in learning English, more specifically it aims to improve English vocabulary for children whose age are between seven years old to fourteen years old.The method of the research is quantitative research in design experiment class and control class.The Reseacher could take conclusion that there was a significant between experiment class and control class, The mean of experiment class is greater than the mean of control class ( 77,25&gt; 57,75). on the other hand, the test of hypothesis using t-test formula shows the value of t-test is greater than the value of the t-table. The value of t-test is 3,712 while the value of t-table on t-table in degree of freedom of 38 with level of significant of 0.01 is 2,42. The hypothesis is accepted.Based on the result of this study, it is accepted to be a good information for many teachers espesially English teachers. It is one solution to be used as appropiate method in teaching learning proses. It could be an alternative that could be used in teaching.</p>

Pengaruh Persepsi Kualitas, Persepsi Value , Kepuasan Wisatawan, dan Kunjungan Ulang terhadap Rekomendasi Mulut Ke Mulut

This research was designed to know the influence of quality perception, value perception, tourist satisfaction, and revisiting to Word of Mouth (WoM) recommendation. Methods that are used in this research are questioner to collect the data, part-whole used to test the validity and Cronbach alpha to test the reliability. Testing the normality, Linearity, multi colinearity, autocorrelation and heteroskedasticity is to detect the compatibility of using a model of the path regression as the test of hypothesis. The result of this research indicates that: (1) quality perception, value perception, tourist satisfaction, and revisiting significantly have positive effect positive to WoM recommendation, (2) quality perception has the positive influence to value perception, (3) quality perception has the positive influence which is very significant to tourist satisfaction, (4) quality perception has the positive influence which is significantly the revisiting, (5) quality preception has the positive influence which is significant to WoM recommendation, (6) perception assess has positive influence to tourist satisfaction, (7) perception assess is to own the positive influence which is significant to revisiting, (8) perception assess has the positve influence which is very to WoM recommendation, (9) tourist satisfavtion has a positive effect significantly to the revisiting, (10) tourist satisfaction has a positive effect to WoM recommendation, (11) resiviting has the positive influence which is very significant to WoM recommendation, and (12) revisiting has more dominant influence in creating WoM recommendation of Jogja tourism object to others people.

Pengaruh Umur CEO, Struktur Dewan Komisaris, Frekuensi Rapat Komite Audit, Konsentrasi Kepemilikan, dan Tenur Audit terhadap Volatilitas Idiosinkratik

Idiosyncratic volatility is a series of sharp increase or decreas in stock prices due to a company's fundamental. This study argues that transparent financial reports should reduce idiosyncratic volatility. Transparent financial reports are the function of CEO age, board of commissioner size, board of commissioner meetings frequency, Audit Committee meetings frequency, ownership concentration, and audit tenure. Therefore, this study examines the effect of these variables on idiosyncratic volatility. Samples were gathered from Indonesian public firms for the periode of 2014-2018. Using regression analysis for the test of hypothesis, results show that while board of commissioner meetings frequency and audit tenure have negative effects on idiosyncratic volatility, the size of the board of commissioners, concentration of ownership have positive effects on idiosyncratic volatility. On the contrary, CEO age and audit committee meetings frequency have no effects on idiosyncratic volatility.

APPRAISAL OF THE IMPLEMENTATION OF LAND-USE REGULATIONS ON COMMERCIAL PROPERTY DEVELOPMENT IN ILORIN, NIGERIA

The implementation of land use regulations on commercial property development is extremely important because of benefits abound in it for the society. Ilorin the capital of Kwara state, Nigeria is experiencing influx of many residents which gave rise to series of urban challenges. This paper appraised the implementation of land use regulations on commercial property development in Ilorin, Nigeria. The study adopted survey research design and census method was adopted for the commercial properties and Estate Surveying and Valuation firms in the study area. Questionnaires were distributed to 26 practicing Estate firms in Ilorin Kwara State, 110 and 39 selected landlords / occupiers of commercial properties in Gambari-Ipata-Emir’s road and Government Reserved Area in Ilorin, Nigeria. Out of which 24 questionnaires (92%) and 110 (100%), 36 (92 %) were returned and found useful for the study. Data collected were analysed using descriptive statistics of cross tabulation and inferential statistics of Independent Sample t – Test and test of hypothesis. The research revealed that the p-values were all greater than 0.01 which led to the acceptance of null hypothesis that the level of implementation of land use regulations on commercial property development does not vary in the study area. The study conclude that there were hindrances to effective implementations of land use regulations on commercial property development across the study areas, and if not corrected will continue to affect the welfare of the citizens, ease of commercial activities, will lead to falling in commercial property’s rental value, falling in urban aesthetic value, and an increase in externalities. The study recommended proper government intervention in providing better resources to improve the level of monitoring and enforcement of land use regulations on commercial property development.

MATHEMATICS TEACHER’S ENGAGEMENT AND STUDENTS’ MOTIVATION TO LEARN MATHEMATICS

Effective teachers are those who are highly engaged and who have an essential role in promoting student motivation and achievement. Thus, this study was conducted to ascertain the engagement of Mathematics teachers and its relation to the learning motivation of students in a state college in the Philippines. It employed the mixed methods, specifically Creswell’s (2014) sequential explanatory approach, with the survey-questionnaire, interview, and focus group discussion as data collection techniques. The findings of the study revealed that teacher’s engagement in Mathematics in terms of “Body Language and Behaviors,” “Consistent Focus,” and “Individual Attention,” were “Very High” while “Rigorous Thinking,” “Meaningfulness of Work,” “Verbal Participation,” “Clarity of Teaching,” “Performance Orientation,” “Interest and Enthusiasm,” and “Confidence,” were only “High.” Meanwhile, students’ motivation to learn Mathematics as to “Relevance,” “Interest,” “Satisfaction,” and “Confidence” were also “High”. The test of hypothesis on significant correlation showed that there was a close association between teacher’s engagement in Mathematics and students’ motivation to learn Mathematics. There was also a corroboration between the quantitative data obtained from the survey and the qualitative data acquired during the interview and focus group discussion. The result further implied that teacher’s high engagement contributes positively to students’ willingness to learn essential concepts and skills in Mathematics.

Pengembangan Karir, Karakteristik dan Kinerja Auditor

The auditor profession has an important role in the business world. From time to time, the role of the auditor in increasing the credibility of financial statements is increasingly felt and is needed by users of financial statements. The quality of financial reports is expectedly influenced by audit quality. Therefore, research on the characteristics of auditors is very important to understand the factors that affect auditor performance. This study examines the effect of career development and auditor characteristics on auditor performance. The characteristics of auditors examined are focused on auditor independence, organizational commitment, integrity, confidentiality, and motivation. The test of hypothesis is conducted by using multiple regression analysis. The sample is 64 auditors who work in public accounting firms in Semarang. The results show that career development, organizational commitment, confidentiality, and motivation have a positive effect on auditor performance. Meanwhile, auditor independence and integrity have no effect on auditor performance. Abstrak Profesi auditor memiliki peran yang penting dalam dunia bisnis. Dari waktu ke waktu peran auditor dalam meningkatkan kredibilitas laporan keuangan semakin terasa dan sangat dibutuhkan oleh pengguna laporan keuangan. Kualitas laporan keuangan dapat dipengaruhi oleh kualitas audit. Karena itu, penelitian tentang karakteristik auditor sangat penting untuk memahami faktor-faktor yang mempengaruhi kinerja auditor. Penelitian ini menguji pengaruh pengembangan karis dan karakteristik auditor terjadap kinerja auditor. Karakteristik auditor yang menjadi fokus penelitian adalah independensi auditor, komitmen organisasi, integritas, kerahasiaan, dan motivasi. Pengujian hipotesis dilakukan dengan analisis regresi berganda menggunakan 64 auditor yang bekerja di Kantor Akuntan Publik yang ada di Semarang sebagai sampel. Hasil analisis menunjukkan bahwa pengembangan karir, komitmen organisasi, kerahasiaan, dan motivasi berpengaruh positif terhadap kinerja auditor. Sedangkan independensi auditor dan integritas tidak berpengaruh terhadap kinerja auditor.

Foreign Direct Investment and Economic Growth in Nigeria

This study examined the relationship between foreign direct investment and economic growth in Nigeria using secondary data sourced from the Central Bank of Nigeria (CBN) statistical bulletin between the periods of 1986 to 2017. The study employed Vector Error Correction Model (VECM) and Pairwise Granger Causality test to ascertain the direction of causality between variable employed. Findings revealed that of the six exogenous variables used as an indicator of foreign direct investment, only the non-oil related foreign direct investment, trade openness and market capitalization were able to pass test of hypothesis, which suggest that of the six employed independent variables, three established the fact that foreign direct investment is a vital stimuli in promoting economic performance in Nigeria with more emphasis on the non-oil related foreign direct investment. The study thus concluded that non-oil related foreign direct investment is more helpful to Nigeria’s economy compared to oil related foreign direct investment inflows. Consequently, it is recommended that both Nigeria’s private and public sectors should intensify efforts to attract further foreign direct investment inflows into the non-oil related sectors of the economy, while relatively de-emphasizing attraction of inflows into the oil related sector in the interest of the country.

Inference in Multiple Linear Regression Model with Generalized Secant Hyperbolic Distribution Errors

We study multiple linear regression model under non-normally distributed random error by considering the family of generalized secant hyperbolic distributions. We derive the estimators of model parameters by using modified maximum likelihood methodology and explore the properties of the modified maximum likelihood estimators so obtained. We show that the proposed estimators are more efficient and robust than the commonly used least square estimators. We also develop the relevant test of hypothesis procedures and compared the performance of such tests vis-a-vis the classical tests that are based upon the least square approach.