Yayat Ruhiat

Scopus Publications

Enhancing organizational and interpersonal communication in multinational companies: The effectiveness of the onion model
John Chaidir, , Haerofiatna Haerofiatna, Henny Setiani, Yayat Ruhiat, , , and
International Journal of Advanced and Applied Sciences
As we moved into the 21st century, it became clear that the success of any organization depends on more than just the technical skills of its managers, who lead the business. It also relies on the active participation of every employee and the quality of communication and interactions within the company. This study focuses on the development of onion models and how effective they are in improving interpersonal communication. The research employed a mixed-method approach, gathering data through reviews of existing literature (secondary data) and direct fieldwork, including interviews and Focus Group Discussions (FGD) for primary data. Both qualitative and quantitative methods were used to analyze the data. The participants in this study included 50 individuals ranging from owners and directors to managers, regular employees, and office assistants. The findings indicate that the onion model demonstrates a pattern of organizational communication that a) happens between individual members or across the whole organization, b) is formal and hierarchical, c) includes both verbal and non-verbal forms, d) can be direct or indirect, and e) serves the purpose of interaction and detailed discussion related to the company's internal operations. The study concludes that the onion model is effective for use in large and multinational companies.

Multi-Cultural and Local Wisdom-based Curriculum Development Model in the Independent Campus Learning Program to Improve Graduates' Micro Skills
Isti Rusdiyani, Yayat Ruhiat, Syafrizal, Agus Yuniawan Isyanto, and Elin Herlina
Raiya Academic International LLC
In the Independent Campus Learning Program [Merdeka Belajar Kampus Merdeka (MBKM)], the 5-1-2 learning pattern is used in the undergraduate program. In implementing this pattern, curriculum coherence is needed between study programs and between institutions. A model for developing a curriculum based on local wisdom and multiculturalism was created to improve the micro-skills of program graduates. A model for developing a curriculum based on local wisdom and multiculturalism was created to improve the micro-skills of program graduates. A model for developing a curriculum based on local wisdom and multiculturalism was created to improve the micro-skills of program graduates. In order to attain the objective, a hierarchical pattern of relationships is employed, beginning with the central construct, primary dimension, and indicator. A structural Equation Model (SEM) is used to analyse the relationship between variables, while an inductive approach is used for exploratory purposes to identify factors. In order to evaluate the dependability of the model, a study was conducted at two different universities in Indonesia: Sultan Ageng Tirtayasa University in Serang, Banten Province, and Galuh Ciamis University in West Java Province. The study involved testing the coherence of the curriculum of various programs at both universities and evaluating the micro-skills of graduates who had participated in the MBKM program. Samples from the 4 study programs implementing MBKM at the two universities were used to test curriculum coherence. Then, to determine the increase in graduates' micro-skills, a sample of 70 students was used. The results of the analysis show that curriculum development has a direct effect on improving graduates' micro-skills. In developing the curriculum, three factors strengthen micro skills improvement: development of knowledge, responsiveness to technological developments, and relevance to needs.

Young athletes' physical fitness increases the impact of traditional sport intervention: 11 weeks of movement experience
Ida Zubaida, Yayat Ruhiat, Aan Hendrayana, and Edi Setiawan
DJ Studio Dariusz Jasinski
This study aims to investigate the effect of traditional sports in order to improve physical fitness of young athletes. Researchers adopted an 11-week randomized controlled trial design. Participants included young athletes from Sultan Ageng Tirtayasa University (Indonesia) who were allocated to TSG (n = 20) and CG (n = 20). Analysis of Students’ t-tests for paired samples used to test differences in physical fitness among males and females in two groups at the pre-test and post-test stages. The effect size test (Cohen’s d) was used in this research. The first findings showed that male participants in TSG had differences in physical fitness in the pre-test and post-test stages related to Multi-stage (p < 0.001, d = −2.17), Shuttle run: 4×10 meters (p < 0.001, d = 2.43), 30 meter run test (p < 0.001, d = 1.85) and sit and reach test (p = 0.002, d = −1.41), while male participants in CG had differences in physical fitness in terms of Shuttle run: 4 ×10 meters (p < 0.001, d = 1.69), Run test 30 meters (p < 0.001, d = 1.64), but no differences were found for other components. The second finding showed that female participants in TSG had differences in physical fitness in the pre-test and post-test stages related to Multi-stage (p < 0.001, d = −1.53), Shuttle run: 4×10 meters (p < 0.001, d = 2.76), 30 meter Run test (p < 0.001, d = 2.02) and Sit and reach test (p < 0 .001, d = −1.72), while the female participants in CG had differences in physical fitness in the 30 meter Run test (p < 0.001, d = 2.87), but no differences were found for the other components. In conclusion, this research proves that traditional sport for 11 weeks can improve the physical fitness of young athletes.

HEAT TRANSFER ANALYSIS CABINET-TYPE ERK SOLAR DRYER MACHINE FOR DRYING AGRICULTURAL PRODUCTS
Yayat Ruhiat and Yudi Guntara
OU Scientific Route
The Cabinet-type ERK solar dryer is manufactured by a temperature distribution process so that the temperature inside the appliance is well distributed. The cabinet-type ERK solar dryer comprises several components to maintain the water content, including a drying oven, air blower, heat-resistant pipe, hot water pump, thermostat, heat exchanger, and heater. These tools are used to convert heat radiation into conduction or convection so that the dried agricultural products' water content is relatively low. The data needed to show the quality of the tool include temperature on temperature received by the wall (Tw), absorbent plate (Tp) and room temperature (Tr). And as for other supporting data including the environmental air/ ambient temperature (Ta) and solar irradiation (I) for optimal tool usage time. The experiment results for 5.5 hours, as many as 23 measurements with time interval 15 minutes, obtained a relatively unchanged temperature distribution. During that time, the average temperature received by the wall (Tw) was 41.26 °C, while the middle plate temperature (Tp) was 40.65 °C and room temperature (Tr) was 40.71 °C. Thus, the temperature in the Cabinet-type ERK solar dryer is well distributed. The distribution percentage between wall temperature and plate temperature is 98.52 %, while wall temperature and room temperature are 98.67 %. The result indicates that the Cabinet-type ERK solar dryer is potential as a drying device for agricultural commodities. It is hoped that the Cabinet-type ERK solar dryer will be an alternative to a drying system that can improve the quality of agricultural commodities for farmers in Indonesia

Forecasting rainfall and potential for repeated events to predict flood areas in Banten province, Indonesia
Yayat Ruhiat
JVE International Ltd.
In a period of ten years, from 2011-2020 rainfall in Indonesia is relatively high, with annual rainfall between 460.5-4,627.4 mm. The high rainfall has implications for flooding in several provinces. During this period, almost every year several areas in Banten Province experienced floods. To predict areas of Banten Province that have the potential for flooding, forecasts of rainfall and the potential for repeated occurrences of high rainfall are carried out. In making the forecast, observations were made at the Serang Meteorological Station, the Budiarto Curug Meteorological Station, the South Tangerang Climatology Station, and the Tangerang Geophysics Station. Rainfall data from the four stations were analyzed by Fourier transform, Gumbel method and Mononobe method. Distribution analysis results obtained rainfall in Banten Province between 0.0-607.9 mm with the length of rainy days per month between 0-26 days. Then, the results of the Fourier transform analysis; Banten Province included a monsoon rain pattern with unimodial rainfall. Furthermore, the results of the analysis of the Gumbel method and the Mononobe method, Banten Province included the category of moderate rain and tended to be heavy, even extreme. Based on the results of the analysis using these two methods, in 2025 in Banten Province, it is predicted that 11 % heavy rain, 3 % very heavy rain and 1 % extreme rain are predicted. In that year, it is predicted that there will be 65 sub-districts in Banten Province that have the potential for flooding. The sub-districts that have the potential for flooding are mostly located in Serang Regency, Serang City, Tangerang City, and South Tangerang City. This potential flood is predicted to occur in: January, February, March, April, May, October and November.

Pollutant Absorber Design to Minimize Air Pollution Emissions from Industry
Yayat Ruhiat and Yudi Guntara
IOP Publishing

Regional Detection Polluted with Diffusion and Convection Models in Banten Province
Y Ruhiat and Y Guntara
IOP Publishing

Dynamics of organizational change: Determination of the interest of maritime education power

Impact of high vocational education revitalizationon the quality of information technology

Learning english for maritime polytecnic’s: Language english learning strategies and proficiency

The impact of sulfur dioxide and dust pollutant emission from industrial area toward the ambient air changes in Cilegon City
Yayat Ruhiat, Abdul Fatah, and Rian Fahrizal
Diva Enterprises Private Limited

Absorption model of air polluters at industrial stack using coconut shell
Yayat Ruhiat et al., Yayat Ruhiat et al., and
Transstellar Journal Publications and Research Consultancy Private Limited
In minimizing emitted air pollutants, it is necessary to modify it by creating a pollutant absorber. Modifications are made in this research is by using coconut shell charcoal mounted on the end of industrial stack. The coconut shell used in absorbing air pollutants, before leaving the stack, while to keep the charcoal from burning, a condensation system is performed. The results showed that the concentration of SO2 and dust contaminants decreased by 34% and 42%, respectively. The decrease in pollutant concentrations indicates that coconut shell charcoal used as a pollutant absorbent tool emitted from the industry. Among the two types of pollutants tested, it appears that coconut shell is more effective to absorb pollutants of dust. Therefore, other modifications are needed, so that the coconut shell can optimally absorb all types of air pollutants.

Air Pollutants Minimalization of Pollutant Absorber with Condensation System
Yayat Ruhiat, Firmanul Catur Wibowo, and Yuvita Oktarisa
IOP Publishing
Industrial development has implications for pollution, one of it is air pollution. The amount of air pollutants emitted from industrial depend on several factors which are capacity of its fuel, high chimneys and atmospheric stability. To minimize pollutants emitted from industries is created a tool called Pollutant Absorber (PA) with a condensing system. Research & Development with the approach of Design for Production was used as methodology in making PA. To test the function of PA, the simulation had been done by using the data on industrial emissions Cilegon industrial area. The simulation results in 15 years period showed that the PA was able to minimize the pollutant emissions of SO2 by 38% NOx by 37% and dust by 64%. Differences in the absorption of pollutants shows the weakness of particle separation process in the separator. This condition happen because the condensation process is less optimal during the absorption and separation in the separator.

Effectiveness of microscopic virtual simulation (MVS) for conceptualizing students’ conceptions on phase transitions
Firmanul Catur Wibowo, Andi Suhandi, Dadi Rusdiana, Yayat Ruhiat, Dina Rahmi Darman, and Achmad Samsudin
American Scientific Publishers

Spatial and temporal model development for analysis the impact of concentration of pollutants and emissions to the air quality
Yayat Ruhiat, Firmanul C Wibowo, Aceng Hasani, . Kuswantoro, Rian Fahrizal, and . Suherna
American Scientific Publishers

Microscopic Virtual Media (MVM) in Physics Learning: Case Study on Students Understanding of Heat Transfer
F C Wibowo, A Suhandi, D Rusdiana, D R Darman, Y Ruhiat, Y R Denny, Suherman, and A Fatah
IOP Publishing
A Study area in physics learning is purposeful on the effects of various types of learning interventions to help students construct the basic of scientific conception about physics. Microscopic Virtual Media (MVM) are applications for physics learning to support powerful modelling microscopic involving physics concepts and processes. In this study groups (experimental) of 18±20 years old, students were studied to determine the role of MVM in the development of functional understanding of the concepts of thermal expansion in heat transfer. The experimental group used MVM in learning process. The results show that students who learned with virtual media exhibited significantly higher scores in the research tasks. Our findings proved that the MVM may be used as an alternative instructional tool, in order to help students to confront and constructed their basic of scientific conception and developed their understanding.

A formation model in distribution of sulfur dioxide (SO<inf>2</inf>) concentrations in cilegon city with the use of grid technique
Yayat Ruhiat, Surherna Sutisna, Acenga Hasani, Muhummad Kuswantoro, Sri Widiastuti, Rian Fahrizal, and Firmanual Wibowo
Common Ground Research Networks

The effect of frit glass content on the crystalline structure, microstructure and electrical properties of local mineral and Fe<inf>2</inf>O<inf>3</inf> doped TiO<inf>2</inf> films
Yus Rama Denny, Dani Gustaman Syarif, Yayat Ruhiat, Teguh Firmansyah, and Andri Suherman
AIP Publishing LLC
The electrical, crystal structure and microstructure properties of NTC thermistor from local mineral (containing Fe2O3-SiO2-K2O-Na2O-MnO) doped TiO2 thick films were investigated by means of electrical measurement, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD revealed that the crystalline of all thick film has a hexagonal (illminite) structure without changing in different frit glass content. The microstructure of thick films was discussed by utilizing SEM analysis. The results showed that the film with lower frit glass content has a lower electrical resistivity and thermistor parameter. This result demonstrated that the electrical properties of the thick films can be improved by changing the frit glass content. In addition, the comparison of FeTiO3 thick films from local mineral doped TiO2 with the pure Fe2O3 doped TiO2 (Fe2O3 powder having the purity of 99.9%) were discussed. We believe that our results can be a good guide for those fabricating FeTiO3 thick films with the purp...

Yayat Ruhiat

EDUCATION

RESEARCH INTERESTS

Scopus Publications

Publications

RESEARCH OUTPUTS (PATENTS, SOFTWARE, PUBLICATIONS, PRODUCTS)

Industry, Institute, or Organisation Collaboration

INDUSTRY EXPERIENCE