Teaching in a Digital Era: English Lecturers’ Readiness toward the Internet Use in Teaching and Learning at Selected Higher Education Institutions in Indonesia

Hadiyanto,Amirul Mukminin,Makmur,Marzul Hidayat,Failasofah APEC국제교육협력원 2013 Asia-Pacific Cybereducation Journal Vol.9 No.2

The purpose of this study was to examine English lecturers’ readiness toward internet use in English teaching and learning at selected universities in Jambi, Sumatra, Indonesia. A questionnaire was used as a research instrument to sixty-five participants who were recruited through a variety of networking sources, but forty-seven participants completed and returned the questionnaires. Data were analyzed by using descriptive statistics, Pearson Product Moment Correlation, and a t-test. The major findings indicated that the English lecturers’ readiness toward Internet use for teaching and learning was at an average level. This study also found that there was a significant positive correlation between the lecturers’ background of internet use and the level of lecturers’ readiness toward Internet use. There was a positive correlation between lecturers’ knowledge readiness and attitude readiness. However, there were significant differences in the level of readiness between English lecturers at public institutions and private institutions. The findings of this study shed light on policy makers and leaders’ understanding of English lecturers’ readiness toward internet use in English teaching and learning in Indonesian higher education. Policy implications and future research are also discussed.

Steady-State Analysis and Trade Balance Convergence Rate of ASEAN Member Countries

Agus Maolana HIDAYAT1,Rina INDIASTUTI2,Budiono BUDIONO3,Ferry HADIYANTO4 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.6

The international trade role of a country depends on its economic condition, international economic openness, and cooperative orientation in its trade. This research analyzes AFTA free trade relating to the steady-state, disparity, and the ASEAN members’ trade balance convergence rate. The data used was taken from UNCTAD, ASYB, and Central Bank of Indonesia. The analysis model used was the most appropriate from Common, Fixed Effect Model (FEM), Random Effect Model (REM), and Generalized Method of Moment (GMM). ASEAN members’ balance trade reached a different steady-state for every country, therefore convergence pattern did not take place, and the divergence pattern occurred in trade balance among the member countries. The divergent trade balance was due to the different early economic conditions, macroeconomic development, trade openness, and trade facilities and infrastructures in each country. It was also due to the ASEAN intratrade cooperative role and low investment coming from intra-ASEAN foreign investment. To promote trade and lower divergent trade balance, it is necessary to promote intra-ASEAN trade and create a conducive situation for foreign capital investors.

The Contributions of Leadership, Supervision, and Working Motivation to Indonesian Elementary School Teachers’Performance and Policy Recommendations

Hadiyanto,Amirul Mukminin,Robin Pratama APEC국제교육협력원 2015 Asia-Pacific Cybereducation Journal Vol.11 No.2

The purpose of this currents study was to examine the contributions of the contributions of leadership functions, supervision, and working motivation on teachers’ performance at public elementary school in one of the sub-districts in Jambi Province, Sumatra, Indonesia. Data were collected through a questionnaire from 122 teachers. The data were analyzed by using the descriptive analysis and regression analysis techniques, assistanced by the statistical application of the SPSS release 16.0. The findings of this study indicated that the leadership function included very high category with a mean value of 3.2657, supervision with a mean of 3.2608, motivation with a mean value of 3.3465, and teachers’ performance with the mean value of 3.4447. The findings of the simple regression analysis with a single-step method (entered) also indicated that the contribution of leadership function to teachers’ performance with a value of R Square was 47.6%, the contribution of supervision to teachers’ performance with a value of R Square was 45.3%, and the contribution of work motivation to teachers’ performance with a value of R Square was 69.3%. Furthermore, the findings of multiple the regression analysis showed that the contribution of leadership function, supervision, and working motivation altogether to teachers’ performance with the value of R Square was 74.3%. This study provided information for policy makers, school leaders, researchers, and teacher educators to understand how the contributions of the contributions of leadership functions, supervision, and working motivation affect teachers’ performance.

Response surface optimization of lipid and protein extractions from Spirulina platensis using ultrasound assisted osmotic shock method

H. Hadiyanto,Nais Pinta Adetya 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.5

In this study, we optimized the process for extracting lipids and proteins from wet biomasses of Spirulina sp. using a 4-kHz ultrasonic osmotic shock method with ultrasound enhancement at a constant frequency of 40 kHz. Optimization was conducted using a response surface methodology (RSM) at an osmotic NaCl concentration of 10–30%, solvent:biomass ratio of 5–15 v/ w, and extraction times of 20–50 min. The present osmotic shock method with ultrasound irradiation increased lipid yields to 6.65% in the presence of 11.9% NaCl, a solvent: biomass ratio of 12:1 v/w, and a 22-min extraction time, and protein yields to 43.96% with 15.12% NaCl, a solvent:biomass ratio of 10:1 v/w, and a 30-min extraction time.

Assessing Carbon Stock and Sequestration of the Tropical Seagrass Meadows in Indonesia

A’an J. Wahyudi,Susi Rahmawati,Andri Irawan,Hadiyanto Hadiyanto,Bayu Prayudha,Muhammad Hafizt,Afdal Afdal,Novi S. Adi,Agustin Rustam,Udhi. E. Hernawan,Yusmiana P. Rahayu,Marindah Y. Iswari,Indarto H. 한국해양과학기술원 2020 Ocean science journal Vol.55 No.1

Seagrass meadows provide critical ecosystem services for coastal areas, e.g., as nursery habitats for various fish species, help with water filtration of suspended sediment, and provide food for dugongs (Dugong dugon). Their role as “blue carbon” and their capacity to mitigate climate change, by means of Natural mechanism of Carbon Dioxide Removal (NCDR) from the atmosphere, has recently gained increased attention. However, available scientific methods such as guidelines and manuals to measure carbon stock and sequestration still rely heavily on field sampling activities and laboratory analyses. Despite their accuracy, neither of these methods are applicable for large-scale carbon inventories nor are they practical in areas with limited carbon-related data and laboratory resources. Thus, it is necessary to determine whether any of the seagrass-related variables (e.g., coverage, density and biomass) may be treated as a proxy that are both robust and practical to assess the capacity of seagrass to store and sequester carbon. We developed formulas, assessed their robustness, and used both the formulas and the proxy to estimate carbon stock and the sequestration potential of the seagrasses. Furthermore, this study aims to elucidate the carbon stock and sequestration potential capacity of the seagrass ecosystems in Indonesia. We used the data of seagrass- and carbon-related variables obtained from eleven study sites and developed several candidate formulas using the Robust Linear Mixed Models (rLMMs). We found that the best formulas are comprised of multiple seagrassrelated variables that consistently include biomass and coverage. This suggests that a combination of biomass and coverage is the best proxy to estimate carbon stock; however, a single proxy of seagrass coverage is recommended for practical seagrass monitoring purposes by the local government. Estimations of carbon stock and sequestration subsequently follow the formulas in the present study. Here we estimated, using a single proxy of seagrass coverage, that the above- and below-ground carbon stock, and carbon sequestration capacity of seagrass ecosystems in Indonesia reached 80–314 ktC, 196–696 ktC, and 1.6–7.4 MtC/year, respectively.

Plastic shredding machine for pyrolysis feedstock applied to public outreach of plastics waste-to-oil technology

( Mk Biddinika ),( M Syamsiro ),( A N Hadiyanto ),( Z Mufrodi ),( F Takahashi ) 한국폐기물자원순환학회(구 한국폐기물학회) 2017 한국폐기물자원순환학회 심포지움 Vol.2017 No.1

Public awareness and understanding are often considered as one of barrier on waste recycle and management. In plastic waste management, beside some people may not fully aware on environmental impact of plastic waste due to its unbiodegradability characteristic, the understanding about benefit of plastic waste is probably low. To help increase awareness on plastic waste management, a model machine for pyrolysis of plastics waste in small scale has been developed so that the model is transportable easily from one community-based waste recycle to another for campaign or education purpose. However, feedstock of the pyrolysis machine requires the plastic waste into small size to maximize reactor capacity. From practical experience of public outreach, the plastic waste-to-oil technology is more impressive to the public if the feedstock is seen from its original appearance as a waste, such as plastic packaging,plastic bag, or PET bottle. Therefore, a shredding machine for pyrolysis feedstock of plastic waste has been developed in order to fulfil requirement of small size pyrolysis feedstock and easily transportable. The shredding machine has a dimension of 63 cm x 50.5 cm x 136.5 cm (length x wide x height). The main power for shredding knife mover is 5.5 HP diesel or gasoline-fueled engine instead of electric-powered motor. Although the diesel engine emits exhaust fume and more noise,which is not convenient for in-door operation in some waste recycle center, however considering electric power availability in the center, electric motor is not a good option for the shredding knife mover. The machine has been tested to shred PET bottle waste and it is capable of 14 kg/hour of shredding capacity. The capacity could be increased by adding more material input as well as using water to push the shredded plastic flowing down. The selection of diesel engine as the knife mover also creates more noise during operation whilst verbally explaining how the machine works. It is not so convenient for practical education purpose compared with that of electric motor which emits less noise and exhaust fume.

Analysis of wastewater facultative pond using advection-diffusion model based on explicit finite difference method

S. Sunarsih,Dwi Purwantoro Sasongko,S. Sutrisno,Gitta Agnes Putri,H.Hadiyanto 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.3

This paper describes an advection-diffusion mathematical model in facultative ponds of different geometrical domains. The geometrical domains of the facultative ponds are the side (one-dimensional), the plane (two-dimensional), and the space (three-dimensional). The purpose of this paper is to know the numerical simulations of these three advection-diffusion models (1D, 2D, and 3D) using explicit finite difference method. Numerical simulation can be used to evaluate the distribution of pollutant concentrations. The concentration of pollutant tested was same as the concentration of biochemical oxygen demand. The result of numerical simulation showed that more complex the geometrical domain of a facultative pond, the more visible is the process of moving the mass concentration (advection) and mass spread (diffusion) in the facultative ponds.