bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mathematical models of water pollution evaluation
Authors: Drozdov I. Yu. , Aleksakhin A. V. , Aleksakhina Yu.V. , Petrusevich D. A. 
Published: April 2021

Abstract
BOD (Biological Oxygen Demand or Biochemical Oxygen Demand) is the amount of dissolved oxygen, expressed e.g. in milligrams of oxygen per dm3 of water, consumed by micro-organisms to decompose the organic matter present in water. Ammonium and phosphate contamination prediction in river water and BOD in river water prediction datasets (provided by the Ukrainian government) have been handled. The paper presents proposal of linear regression models (configured with the Ordinary Least Squares (OLS) method) describing dependencies between the target water station and the test station values. The mutual influence between amounts of ammonium and phosphates in river water has been shown The ArDL(p, q) models were used to investigate correlation between concentrations of phosphates and value of BOD at the target river station. Influence of phosphates amount on the BOD in river water has been proven with statistical tests.
Remote sensing monitoring of influence of underground mining in the area of the S3 Express Road
Authors: Bugajska N. J. , Milczarek W. J. 
Published: April 2021

Abstract
Land subsidence is strongly associated with the activities of underground mines. Direct influence of exploitation lead to the formation of subsidence troughs, which are a common phenomenon in the Legnica-Glogow Copper Belt, in southwest Poland, where copper ore is currently intensively mined. As a result, the process of creating troughs may cause significant deformations in the surrounding urban infrastructure, including highways, bridges and railways. Satellite radar interferometry (InSAR), as a remote sensing method, appears to be a useful tool for detecting this type of extensive terrain surface change. Aim of this research was to detect the occurrence of displacements of the S3 Express Road section between the Glogow West Node and the Glogow South Node. For this purpose 29 images provided by European Space Agency (ESA) over descending orbit 22 was obtained from the Sentinel-1A satellite for the period from May 14, 2019 to April 26, 2020. Open source softwares has been used – GMTSAR to generate differential interferograms using the Persistent Scatterer Interferometry (PSI) method and Stanford Method for Persistent Scatterers (StaMPS) to process Persistent Scatterers (PS). The express road, as an anthropogenic object, is characterized by relatively high radar backscatter, thanks to which subsidence of the area are clearly noticeable and indicate the trend of long-term deformations.
Analysis of the vegetation condition on the area of the closed Babina mine in 1989-2019 using multispectral satellite images
Authors: Buczyńska A. , Blachowski J. 
Published: April 2021

Abstract
Technical and biological treatments, aiming at granting or restoring use/natural values of lands degraded by mining operations, are carried out already at the stage of mining works and continue after the end of exploitation. As a result of these activities, area of plant cover increases and condition of vegetation in the former mineral extraction is improved. However, monitoring of post-mining areas in various regions of the world indicates that in the sites of former exploitation local degradation of vegetation may occur, despite the completion of the reclamation process. Adverse changes in flora can be caused for example by water penetrating deep into the ground through the system of underground pavements or their collapsing. The purpose of this publication is to present the changes in the condition of plant cover within the Pustkôw mining field, one of the four fields of the closed lignite “Friendship of Nations - Babina Shaft” mine. The analysis of variation in the state of the plant cover health was carried out for the period of 1989-2019 based on NDVI, EVI and GNDVI spectral indices, developed using multispectral images of the Landsat TM/ETM+/OLI missions. The obtained results provide information about systematic improvement of the flora condition in the analysed region and indicate an increase in green areas. In 1989-2019, overgrowing of the shorelines of anthropogenic lakes and heaps was observed, as well as reservoir with a decreasing surface area due to vegetation succession was identified. In 2016, local degradation of the plant cover was also observed in the north-western part of the Pustków field. The obtained results prove the necessity of continuous monitoring of the flora health in the area of the analysed mine, but also in other post-mining areas.
Comparison of 3D models of an object placed in two different media (air and water) created on the basis of photos obtained with a mobile phone camera
Authors: Kujawa P. 
Published: April 2021

Abstract
Photogrammetry is one of the contactless geodetic techniques that provide reliable information about objects and their surface properties. Traditional photogrammetric methods require specialized equipment, such as metric cameras, which are very expensive and difficult to access, and the processing of the data obtained from them requires a significant investment of time. An alternative to this solution are generally available non-metric cameras, which can replace professional photogrammetric devices. Currently, consumer-grade digital cameras are enjoying the increase of popularity among photogrammeters thanks to the interchangeable lenses, good image sensor quality and the ability to manually set all camera parameters. However, due to the high costs of purchasing and maintaining such equipment, mobile phone digital cameras are increasingly used, the parameters of which are beginning to match many professional digital SLRs. The newest smartphones are also waterproof, so they can have potential applications in underwater photogrammetry.
This article presents the possibilities of using mobile phone cameras in close-range photogrammetry and shows the beginning of research on the use of smartphones in underwater photogrammetry. Three-dimensional models of the gear wheel were made on the basis of photos obtained in two media: in the air and underwater. The two point clouds were then compared, obtaining an average distance difference of ±0,3 mm.
Live Recovery After Post Earthquake and Tsunami: Economic Review Case Studies of Earthquake and Tsunami in Japan and Indonesia
Authors: Kurniasari Z , Nieamah K F , Arum W F 
Published: April 2021

Abstract
Natural disaster is a natural event that often gives such impact on the living things populations. The purpose of this research is to determine whether the occurrence of earthquake and tsunami has the potential to cause economic loss, thus, mitigation measures can be taken as an effort to reduce these losses. The method used in this research is quantitative. The data used are primary data from questionnaires, and secondary data were gained from various literatures. Data analysis was performed using Microsoft Excel. Based on the data analysis that has been conducted, the results show that earthquake and tsunami have a relation to the economy. All respondents agreed that earthquake and tsunami caused disruption to the public facilities operation. All respondents also agreed that the detriment after the earthquake and tsunami had an effect on fulfillment of needs and economic activities. This answer affirms that the damage of various facilities and production resources caused the increasing of limited satisfaction tools and scarcity arises, then resulting in economic problems.
Achieving Sustainable and Resilient Tourism: Lessons Learned from Pandeglang Tourism Sector Recovery
Authors: Azhari D , Rosyidie A , Sagala S , Ramadhani A , Karistie J F 
Published: April 2021

AbstractAfter the 2018 Sunda Strait Tsunami, the hospitality and tourism industry has been severely impacted. Based on the Indonesia 2010-2025 National Tourism Development Master Plan, one of the visions is sustainable tourism. Sustainable tourism is expected to support the recovery from the tsunami impact on the hospitality industry, improving the current approach and enhance resilience of the tourism area. However, the research question is related tohow optimal has the relationship between the main components of sustainable tourism (ecology, socio-economy, and socio-culture) in Pandeglang? Therefore, this study aims to create the sustainable tourism strategy to fill the gaps on the 2018 tsunami recovery and the COVID-19 pandemic on the tourism sector and hospitality industry policy in Pandeglang. The study uses the qualitative method to describe the main strategy for sustainable tourism based on in-depth interview and secondary data. The findings indicated that the relationship between the main components of sustainable tourism which are ecology, socio-economy, and socio-culture have not been integrated optimally in Pandeglang. Sustainable tourism can provide the preservation and conservation of the sanctity of tourism in Indonesia, especially Pandeglang.
Critical Success Factors (CSFs) on Virtual Hotel Operators in Bandung City
Authors: Ervina E , Indra D , Taufiq R 
Published: April 2021

Abstract
The advancement of Information and Communication Technology (ICT) has encouraged the beginning of a new form of hospitality business known as a Virtual Hotel Operator (VHO). This hotel concept in recent years succeeded in attracting hotel management and cooperation from various accommodation entrepreneurs. VHO concept is considered a disruption that threatens the existing hotels. Some of the big VHO brands in Bandung include RedDoorz and Oyo. The presence of VHO might be one of the reasons for the decrease in the occupancy rate of star hotels. The other hand, the occupancy of non-star hotels continues to increase. It becomes urgent to understand the Critical Success Factors (CSFs) of the VHO. This study aims to identify the determinants of the success of VHO hotels in Bandung. This research is an exploratory study using primary data through surveys, and secondary data that focuses on hotel guests who have stayed through VHO in Bandung City CSFs are measured using questionnaire using the Likert scale of 5 and processed using SPSS 25. The findings of this study indicate that the choose VHOs is inspired by the variety of promotions offered, ease of access, and extensive hotel networks. Furthermore, the factors that support the success of VHO are components of service quality, core products and control strategies. The ease of booking a room and broadness of the network are keys in increasing VHO sales.
Knowledge Management Systems Development and Implementation: A systematic Literature Review
Authors: Riswanto  , Sensuse D I 
Published: April 2021

Abstract
Knowledge management systems can help to automate KM processes that exist in organizations. These systems facilitate knowledge discovery, knowledge capture, knowledge sharing, and applying knowledge in an organization. Using appropriate methods to develop and implementing knowledge management systems help organizations realizing these systems more effectively to enhance an organization’s competitive advantage and facilitate KM processes. This study investigates the approach for developing knowledge management systems in organizations with a systematic literature review in the past ten years. The findings in the literature study show that seventeen methods are used in the development of KMS, where the SECI knowledge spiral is the most often method used for developing KMS by combining it with traditional IS development techniques. In this study, we also compare five methods as candidates for KMS development methods that can support the acceleration of the innovation process in organizations and evaluate them based on KM criteria that support innovation using the analytic hierarchy process technique. It is found that Fernandez’s methodology combines with Joint Application Design (JAD) adoption is the most prominent method used in building a knowledge management system to support the innovation process in an organization and web 2.0 as the most technology applied to support organizational KM implementation.
Destination Attachment and Risk Perception to Determine the Behavior of Volunteer Tourists as Sustainable Development Agents: A Conceptual Model
Authors: Pangaribuan C H , Manurung A H , Saroso H , Rusmanto T 
Published: April 2021

Abstract
Tourism rests on the natural beauty and uniqueness of a tourist destination, both the environment and the people’s socio-culture, hence maintaining sustainability towards a better future. The development of volunteer tourism does not rely solely on tourists’ behavior. Nevertheless, it also depends on the uncertainties and consequences as well as emotional connection of what the destination has to offer. So far, the scholars have done little empirical study on this area. Thus, this study tries to undertake a conceptual research on measuring volunteer tourists’ behavior by understanding the relationship between the norm activation model and destination attachment and risk perception roles. Therefore, a study on the inclusivity of tourists’ attachment to a particular place and perceived risks in volunteer tourism is an essential need to sustain the tourism industry. Constructs affecting the behavior of volunteer tourists are discussed and relevant propositions are made. Managerial implications are suggested, and future research directions are also identified.
A Social Media Mining Using Topic Modeling and Sentiment Analysis on Tourism in Malaysia During Covid19
Authors: Deraman N A , Buja A G , Samah K A F A , Jono M N H H , Isa M A M , Saad S 
Published: April 2021

Abstract
Malaysia’s tourism is affected by the Covid19 pandemic and the MCO implementation, where borders are closed and non-essential activities are halted. Negative effects are also felt by Malaysians and are reflected in social media. This study examines two research questions, finding the issues that Twitter users have been addressing on tourism activities during the MCO period and analyze users’ sentiment regarding their ability to travel after MCO. 5000 data were extracted manually from 11357 data scraped from Twitter, of which 3243 were pre-processed keywords using RapidMiner. The results show that the topic of the debate focuses on three themes, namely the destination of tourism, future planning, and public emotions. In addition, 63% gave a positive view and 22% negative sentiment on domestic tourism. Overall, users of Twitter gave an optimistic outlook on domestic travel and hoped that Covid19 would soon be over.
The Analysis of Employees’ Work Posture by using Rapid Entire Body Assessment (REBA) and Rapid Upper Limb Assessment (RULA)
Authors: Wibowo A H , Mawadati A 
Published: April 2021

Abstract
This study aims to analyze the work posture of employees by using Rapid Entire Body Assessment (REBA) and Rapid Upper Limb Assessment (RULA) methods. In this study, the angle of the employee was calculated, and the results showed that on the body part B, the angle of the back movement is 77º flexion, the neck is 18º extension, and the leg is 39º, while the leg is not uniformly supported. One of the body parts, such as the upper arm is formed an angle of 65 ° flexion, the forearm is 13 ° flexion, the wrist is 0 ° flexion, and the wrist is in the intermediate range of rotation. Based on the results of RULA, a grand score is 7, categorized as Action level 4. Meanwhile, based on the results of REBA, the grand score obtained is 11, and also categorized as Action level 4. Based on the calculation of work posture using RULA and REBA methods, it revealed that the operator’s work posture has a high-level and dangerous risk. Therefore, the operator needs to immediately improve his work posture. In addition, due to the lifting position that was started with no squatting position, it causes waist injures, since it becomes the lift’s pedestal.
The Importance of Human Resources Management to the Supply Chain Management
Authors: Farmania A , Felix  , Alfredo L 
Published: April 2021

Abstract
The purpose of this study was to examine the effect of human resource management on supply chain activities. Increasing the level of performance of human resources in the form of employee skills, employee incentives and employee participation affects the level of internal integration, supplier integration and customer integration in a company. This research uses quantitative research methods by distributing questionnaires to employees of PT. SPP whose results were analyzed using the structural equation model method with the application of SPSS AMOS. From the results of the analysis it was concluded that employee skills, employee incentives and employee participation have an influence on internal integration, supplier integration and customer integration.
Nurses’ perspective of work-related stressors
Authors: Samuel R , Zaini N H , Hassan W H W , Talib A N , Ramly F A 
Published: April 2021

Abstract
There are many issues affecting the human resources in organizations today. The volatility in the global economy has brought about many changes and the human resources are the most affected. They have to learn to adapt to these changes and cope with the daily pressures. No industry is spared as change is seen as the only constant. This research attempts to ascertain stressors from the perception of nurses at a private hospital in Malaysia. It investigates issues pertaining to their workload, work environment, social support, and manpower. Random sampling determined the sample size from the population frame provided by the hospital’s human resource department. Of the 108 nurses selected as respondents only 80 questionnaires were usable. The use of close-ended questionnaires using nominal and interval scales extracted information from the respondents. The data was then analyzed using the SmartPLS 3.3.2. Findings show that workload and manpower availability are stressors among the nurses. The management of the hospitals need to look into these two issues to help overcome the stress faced by the nurses.
The Impact of Covid-19 on Millennial Perceptions of Experience Quality and Flow of Experience and Its Influence on Behavior Intention to Revisit a Nature and Rural Destination (Case on Jakarta, Indonesia)
Authors: Sitinjak M F , Arief Mts , Kuncoro E A , Hamsal M , Temmy  
Published: April 2021

Abstract
The purpose of this research is to study Quality of Experience and Flow of Experience and their influence on Behavioral Intentions to visit natural and rural destinations for the millennial generation. A total of 156 respondents were assessed and valid for further analysis. The result is that the Quality of Experience determines the satisfaction and behavioral intentions of millennials. Meanwhile, it is recommended that flow of experience be used to influence satisfaction because it has no effect on behavioral intention. The results also show how satisfaction can be a strong mediation of the two independent variables on behavioral intention. This study uses Structural Equation Modeling (SEM) with a Partial Least Square approach using SMARTPLS 3.0. The population of this research is millennials in the Jakarta area and its surroundings. The questionnaire was run while Jakarta was implementing the Health Protocol for distance and movement restrictions to avoid the spread of Covid-19.
Implementation of Green Hotel Management 5-Star Hotel in Jakarta, Case Study: The Dharmawangsa Hotel Jakarta
Authors: Ardiansyah I , Iskandar H 
Published: April 2021

Abstract
The hospitality industry is one of the main parts in the development of tourism, thus spending a lot of resources and energy on earth. Since the hospitality sector is such a large component of the tourism industry, more focus is given to the impact it has on the environment. This research aims to examine the implementation of Green Hotel Management at The Dharmawangsa Hotel where the selection carried out in an environmentally friendly nature includes from efficiency initiatives, conservation practices. This research conducted by qualitative research method. Information is obtained through case analysis and interviews with hotel manager with guidance from literature review. This research revealed that implementation green hotel management which includes environmentally hotel operational, land use, energy efficiency, air quality, water efficiency, and waste management at The Dharmawangsa Hotel Jakarta has been successful in conducting environmental conservation activities aimed at developing sustainable tourism activities and gain competitive advantages. Through the management of operational activities have been directed to the development of hotels that are sustainable and environmentally to reduce the impact of environmental damage from current natural conditions.
Study on the Near-IR Light Detection and Ranging (LiDAR) Potential Use as Water Level Sensor
Authors: Jannata M S , Salam R A , Suhendi A 
Published: April 2021

Abstract
Measuring water level is an important component in various applications, especially in hydrological applications. There are various methods of measuring surface water levels, from contact methods to non-contact methods, each has various techniques depending on the measuring instrument used. Among the available techniques, the use of the Near-IR LiDAR for distance measurement has potential uses because it can be used without direct contact with water. In this study, Near-IR LiDAR (850nm) was tested to determine its suitability as a water level sensor. Measurements were tested for variations in water patterns and turbidity. Although water has a low reflectivity for infrared radiation, it was found that in this study there was still the possibility to be able to detect surface water under certain conditions. In the dynamic water test, the measurement error is <10%. In the turbidity test, minimal information on turbidity that can be used by Near-IR LiDAR to detect the water level is 700 NTU with a measurement error of 5.2%.
Usability Evaluation of Pandemic Health Care Mobile Applications
Authors: Mubeen M , Iqbal M W , Junaid M , Sajjad M H , Naqvi M R , Khan B A , Saeed M M , Tahir M U 
Published: April 2021

Abstract
This study was conducted to evaluate the usability of health care apps and its significance in the field of health care. As health care centers are the settings working 24/7 for providing health services to patients. For this study a systematic review, comparison and functionality assessment of selected COVID19 mobile apps was performed. The assessment was performed on two digital platforms, App store on Apple iPhone and Google play store on Android smartphones. Further online search of keywords on Google was also conducted in order to ensure the reliability and validity of apps on these stores. And only those apps were selected which were in English because of the language proficiency of authors. The mobile apps selected were having five features of assessment, a questionnaire, Privacy statement, Precautionary measures if test positive for COVID19, after plans of Pandemic and Region based. The sample was a blend of participants from different fields including students, doctors, patients and software developers. This is quantitative study; a questionnaire was distributed among the selected participants who were familiar with the use of health care mobile apps. The data was analyzed on the basis of gender and age. The results were made on the basis of responses towards effectiveness, efficiency and satisfaction of users towards mobile phone apps. The results show that apps were found 64.5% informative for participants as they helped in fast communication of doctors and patients while sitting at the other corner of world.