bluuebunny/crossref_metadata_2025 huggingface dataset:
Non-Linear Control of a DC Microgrid for Electric Vehicle Charging Stations
Authors: Benamar Abdelkarim , Travaillé Pierre , Clairand Jean-Michel , Escrivá-Escrivá Guillermo
Published: April 2020

Environmental concerns push governments to invest in renewable energy (RE). They are natural sources with a low carbon footprint and do not pollute locally. However, it is technically difficult to deploy high penetration of RE into the utility grid, due to the generation uncertainties and high installation costs, which are some of the most critical issues in RES use in this area. To address this issue, DC microgrids arise as a solution to integrate local distributed generation (DG) and storage, and to mitigate the issues related to AC/DC and DC/AC converters. Thanks to their main advantages for the power grid and energy consumers, microgrids have gained significant interest in recent years.  By another side, the electric vehicles (EVs) market is expected to grow in the coming years, which represent a new load that must be properly managed to avoid grid issues. Thus, this paper discusses the operation of DC microgrid considering the introduction of EVs. A nonlinear control is presented, including the modeling of charging of EVs. The simulated DC microgrid includes solar PV, a battery, and a supercapacitor. Significant variations from PV generation were included to highlight the performance of the methodology. The results show that the voltage fluctuations are small, which provides the DC microgrid with the required voltage stability. Moreover, it has been demonstrated that DC microgrids can be integrated in isolated locations that are not connected to the main grid in view of the RESs and EVs.
Authentication System and Method for Improving Security Login without Typing Password
Authors: Darmawan Irfan , Rahmatulloh Alam , Rianto Rianto , Oriza Ilman Hilmi
Published: April 2020

Authentication in the login process is an important thing that needs attention. The login process will involve a password that is owned by the user, while the password is private and confidential. If someone uses a weak password, the password is likely to be easily hacked. Authentication security needs to be improved, and hackers will get access to the login system with only a few attack techniques such as SQL Injection or sniffing techniques. Besides, the lack of awareness of users by creating weak passwords is easy to guess. Meanwhile, to create a strong password, consisting of upper- and lower-case letters, a combination of numbers and symbols, it is very difficult to remember. This is a very important problem in the login process. This study discusses the login authentication process that can perform login integration without typing a password, because passwords are generated repeatedly with the One Time Password (OTP) method, and use the Quick Response Code (QR) as its support. To disguise the data in the QR Code, which is applied by the Rivest-Shamir-Adleman (RSA) encryption algorithm, and will be tested on a web-based application. The login integration process, using the QR Code token application that runs on an android phone. Which functions as an OTP token generator, and a web-based application will read information from the QR Code token. The result is that with login authentication, this can increase the security and ease of the authentication process without typing a password.
The Dynamics of Livelihood Assets on Moving Duck Farmers
Authors: Kasim Kasmiyati , Salman Darmawan , Siregar Ahmad R , Nadja Rahmawaty A , Rahmadani - , Hastang -
Published: April 2020

Moving duck farming is a livelihood system that does not occupy a settled location but moves. Therefore, the relationship between livelihood assets, livelihood strategies, and livelihood outcome is influenced by the characteristics of the moving. This study aims to explain the dynamics of livestock capital of duck farmers moving at various distances in their moving cycle. Data collection techniques were participatory observation, in-depth interviews, and documentation. Comparative analysis was applied to see the dynamics of livelihood assets composition based on sequences and moving distances. The result showed that there was a dynamic utilization of livelihood assets based on the moving cycle between the travel process and the settling process at the grazing location. It was concluded that there were differences in the composition of the use of human capital, financial capital, physical capital, natural capital, and social capital between short-distance, medium-distance, and long-distance movements. This study found that the livelihood assets usage on moving duck farming was attributed to the moving traveled distance. At nearby movements, livelihood assets tend forgone for moving duck farming since they are also used for paddy fields. Livelihood assets, such as human, natural, and physical capital, are more dominant than the financial and social capital. The capital carries out to retrieve the fields after harvesting as a grazing site while sustaining that access. It can be concluded that the livelihood assets utilization in moving duck-based livelihood systems are dynamics based on the cycle and the distance of moving covered.
Utilizing Bamboo Cavity as an Appropriate Technology for Shallow Groundwater Conversion
Authors: Nanda Abdul Rakhim , Darwis - , Idhan Abubakar
Published: April 2020

Since the early 1970s, many farmers on the west coast of Indonesia have used groundwater to irrigate their agricultural land. Groundwater used is mainly done for rice, corn, and other secondary crops. As a result, the groundwater level in the area has experienced significant degradation and has also been followed by an increase in groundwater salinity. The government's suggestion to make artificial recharge with composter pipes or with "biopori" technology is considered difficult for farmers since they cannot afford to buy PVC pipes as their main ingredient. The challenge gave birth to our innovation to utilize local materials in the form of bamboo for artificial infiltration tools, which we call "bamboo-cavity." The three advantages of filling with "bamboo-cavity" are: (1) the ingredients are cheap and easy to obtain in the area of people's agriculture; (2) pollution-free because the material is without chemicals; and (3) easy to install because there is no need for soil drilling, where the bamboo is directly put in a hand hummer. This initial research was carried out with two objectives, namely: (1) Finding out the effect of "cavities" on the recovery of degraded groundwater; and (2) Knowing the effect of the number of inflection points on the rate of recovery of groundwater. The research was carried out by applying nine variations in the number of infiltration points, on agricultural land with topsoil characteristics that have low permeability. The results of the study provide an overview of the effectiveness of cavities as a means of enhancing, namely: (1) the effect of the number of cavities on increasing groundwater levels is very significant. The results of field observations found that the total increase in groundwater level in wells with the formation of 8 cavities reached 75%, compared to the increase in groundwater level in the control wells and the more installed cavities, the higher the increase in groundwater that occurs; (2) The test wells with the highest value of additive effectiveness are wells with a number of cavities between 56 and 64 points of infiltration, i.e., the recharge effectiveness reaches 3.74.
Effects of Supplementing Gliricidia Sepium on Ration based Ammoniated Rice Straw in Ruminant Feed to Decrease Methane Gas Production and to Improve Nutrient Digestibility (In-Vitro)
Authors: Zain Mardiati , Putri Ezi Masdia , W.S.N Rusmana , Erpomen - , Makmur Malik
Published: April 2020

Rice straw as ruminant feed has low digestibility makes ruminants difficult to digest. Since ammoniated rice straw can increase its digestibility, it is necessary to supplement it with Gliricidia sepium. This research aimed to determine the effect of Gliricidia sepium supplementation on decreasing methane gas production and improving nutrient digestibility in complete ration with ammoniated rice straw. The treatments of this research were: A = 40% ammoniated rice straw + 60% concentrate, B = 40% ammoniated rice straw + 50% concentrate + 10% Gliricidia sepium, C = 40% ammoniated rice straw + 40% concentrate + 20% Gliricidia sepium, D = 40% ammoniated rice straw + 30% concentrate + 30% Gliricidia sepium. This research showed supplementation of G. sepium significantly decreased methane gas production from 27.22 mM to 13.13 mM and the number of protozoa from 6.3 x 105 cell/ml rumen fluid to 4.7 x 105 cell/ml rumen fluid. Gliricidia sepium supplementation increased digestibility significantly (P < 0.05). Digestibility of dry matter increased from 58.83% to 68.54% and digestibility of organic matter also increased from 59.50% to 69.50%. Total VFA (Volatile Fatty Acid) concentration did not differ significantly (P > 0.05) among treatments. Higher levels of G. sepium supplementation increased N-NH3 concentration from 7.33 mM to 10.50 mM and microbial protein synthesis from 74.33 mg/100ml rumen fluid to 108.25 mg/100ml rumen fluid. The treatment had a significant effect (P <0.05) on propionate production and the ratio of acetate: propionate. It can be concluded that 30% of Gliricidia sepium supplementation decreased methane gas production and the number of protozoa. Besides, 30% of Gliricidia sepium supplementation increased digestibility and rumen fermentation.
Applying Simplex Algorithm for Ship’s Motion Simulation Optimization by Using Maneuvering Tests Data
Authors: Nguyen Manh Cuong , Tran Khanh Toan
Published: April 2020

This article demonstrates an effective method to find OHCs (optimal hydrodynamic coefficients) by applying the Simplex algorithm to reduce the errors of the ship’s motion simulation. The solution is to determine OHCs, which are also the coefficients of the ship’s motion equations. A ship’s motion simulation model was programed by contributing the mathematical model of the ship’s motion, applying the numerical method and MATLAB. In the optimization procedure, the form of Objective Function was contributed corresponding to the type of maneuvering test. The Sensitivity Analysis technique and Simplex algorithm are applied to filter and optimize the most sensitive hydrodynamic coefficients. The numerical model was validated by experimental maneuvering test data, including Turning Circle and Zigzag tests of Esso Bernicia 193000DWT Tanker. A good optimization solution was obtained: for Turning Circle test, after optimization, the ship’s simulation trajectory is close to the experimental trajectory with a RMSD of 5.8m, which reduced from an original value of 69m. In the Zigzag test, the RMSD between the ship’s simulation yaw angle and experimental data was reduced 17.3deg to 5.9deg. The other optimization results, such as the convergence of Objective Function, the number of iteration of Optimization Variables, calculated time, etc. are accepted. Therefore, the Simplex algorithm can be applied quite effectively to optimize ship movement (ship’s trajectory, the ship’s yaw angle, etc.). By defining a common set of values by merging the optimal value of the most sensitive coefficients of two tests, which may be used for the other ship’s motion simulation applications.
Analysis of the Structure, Conduct, and Market Performance of Gambier in West Sumatra, Indonesia
Authors: Hendri Muhammad , Syahni Rahmat , Nofialdi - , Ifdal -
Published: April 2020

Gambier is a significant Indonesian export commodity contributing more than US$ 55 million to the economy. Production of gambier is centered in the province of West Sumatra, specifically Lima Puluh Kota Regency. This research aims to analyze the structure, conduct, and market performance of gambier commodity in West Sumatra. Fifty-two gambier farmers and twelve gambier traders were interviewed with data that were analyzed descriptively to determine the market structure, market conduct, and market performance.  Based on the number of end buyers (exporters) in West Sumatra, which are relatively small, only 16 companies compared to the number of sellers (farmers Gambier), this study concluded Gambier market structure tends to be monopsony. The majority of gambier exports from West Sumatra went to India. The market concentration analysis obtained a CR4 value of â‰¥ 0.8, which means low competition in the gambier commodity market. The market entry barriers analysis obtained an average value of MES of 35%, indicating the existence of barriers to market entry for new competitors. Four institutions were involved in marketing; collecting traders I, collecting traders II, interregional traders, and exporters. Of the four marketing channels, farmers-traders II-interregional traders (PAD)-exporters, was the most widely used, amounting to 51.92% of gambier trade. The research shows how different marketing channels benefit different institutions and provides suggestions to move towards a marketing system that provides more benefits to producers. The highest total marketing margin is on channel 1; Farmers-Merchants Merchants Gatherer I-II- Traders Inter (PAD) - Exporters. It occurs because channel 1 provides more marketing agencies. The highest of sharing farmers is the channel 4, i.e. farmers- interregional traders -exporters by 63.15%, and the lowest is in channel 2 (farmers-collecting traders II - interregional traders (PAD)-exporters) of 57.2 %.
Modeling and Optimization of Electrocoagulation Voltage and Water Immersion Time on Heavy Metal Reduction in Fish
Authors: Sandra Sandra , Hendrawan Yusuf , Perdana Tri Wahyu , Lutfi Musthofa , Argo Bambang Dwi
Published: April 2020

Fish that are in polluted waters can contain heavy metals reaching 0.62 mg/kg. While the maximum limit of heavy metals in fish is only up to 0.3 mg/kg. Consumption of fish containing high heavy metals can cause poisoning to death. This study aimed to model and optimize electrocoagulation stress and distilled water immersion time on heavy metals content by using response surface methodology (RSM). Several studies have proven the effectiveness of the electrocoagulation process and the process of distilled water immersion to reduce levels of heavy metals in fish. If the two methods are combined, it might increase the effectiveness of reducing heavy metals. This study used two treatment factors, i.e., the distilled water immersion time factor of 30-90 minutes and the electrocoagulation voltage factor of 6-18 volts. From the results of the RSM, the best model to reduce the heavy metals content was a quadratic model. From the control point of heavy metals contamination in tilapia fish of 14.73 ppm, it was found that the highest heavy metals reduction was at the treatment of 35.51 minutes immersion time and 6.24 volts of electrocoagulation voltage. The maximum result of heavy metals reduction in tilapia fish based on predictions was 86.319%. In comparison, the validation test in the actual experiment was 90.21%, so the optimization results can be said to be valid because of the error value (4.5%) was less than 5%.
Mekong River Delta Agricultural Mechanization Development: Case Study in Vinh Long Province, Viet Nam
Authors: Nguyen Huy Bich , Nguyen Van Liem , Nguyen Van Lanh , Bui Tuan Anh
Published: April 2020

Agricultural mechanization is an essential path to the industrialization of rural regions. Viet Nam has more than 40% of the population in the agriculture sector, contributing nearly 30% of the country’s GDP and still is an agricultural country. Mekong River Delta (MRD) is the most significant agriculture production region of Viet Nam in which Vinh Long is one of sample province might be representative for MRD. This paper presents case study of recent status of mechanization in agriculture, and some recommendations for development the agricultural mechanization in the province. The statistical methods, SWOT analysis, problem approach and practical research have been used. The results indicate that the ratio of agricultural mechanization in Vinh Long might be not to satisfaction to the development of agriculture production. The agricultural field using walking tractors and shoulder engines, investment and financial policies, skill and training level of farmers and agricultural infrastructure such as rural transportation system, irrigation system, and agricultural production industrial processing are the main factors strongly influence on the development of agricultural mechanization in Vinh Long. Some studies proposed recommendations as solutions for sustainable development of the agricultural mechanization are presented in this study, such as agricultural production needs to be reorganized; developing system for training high quality and skill people to work in mechanization process; increase investments in science and technology for agricultural mechanization; setting up the policies to attract businesses and individuals invest in developing mechanization; removing blockages on "agricultural land limit" policy; and creating financial policies supporting to agricultural production investors.
Comparative Study of the Development of Android-Based Flipped Classroom Model between Jeddah and Indonesia
Authors: Ahmadi Farid , Mulyono Sungkowo Edi , Al-Ghamdi Bandar Ali Al-Rami , Harjunowibowo Dewanto
Published: April 2020

The development of information communication and technology has brought a new paradigm of education globally and particularly in Indonesia. Face to face learning has some limitations in terms of understanding, space, and time. The general concept of the flipped classroom method is that the students learn the materials at home and do the reinforcement in the classroom as well as learn the materials they yet to understand. The teacher dominates the learning process verbalism and stressful due to the overload materials in time limitation. This leads to teachers’ unawareness of the student's understanding. Therefore, in Industry 4.0, the learning process internet-based become the primary alternative to overcome the gap.  Android-based flipped classroom model is one of the chosen solutions in this research to develop the online teaching media and learning materials. The research aimed to compare the effect of the Android-based flipped classroom model against the students' achievement in one of the schools in Jeddah and Indonesia. Research and Development (R&D) adapted from Dick and Carey used in this research. The development of an Android-based flipped classroom model effectively implemented in Indonesia but did not effectively implement in Jeddah. The results showed that the students' achievement for Indonesian students was significantly higher than of Jeddah students. However, both students and teachers in both schools showed a positive response to the Android-based flipped classroom model.
The Impact of LRT Jabodebek in Enforcing Capability of the Intercity Transportation Network in the Greater Jakarta Area
Authors: Pangaribuan Grace Rumondang , Purba Denissa Darmawi
Published: April 2020

Jakarta, Bogor, Depok, Tangerang, and Bekasi (Jabodetabek or Greater Jakarta) is the greater capital region in Indonesia. Unfortunately, the fast growth of the population in Jabodetabek was not supported by a good growth or improvement of public transportation. The transportation network was predicted and evaluated to suffer considerable congestion by 2020. The current presence of Bus Rapid Transit and Commuter Line were insufficient to accommodate the current demand for the total number of trips in urban and suburban areas. Additionally, land availability and cost budgeting condition extend this issue to be more challenging. Thus, civil engineers and the government’s decision and collaboration contribute a significant role in solving and suggesting an optimal decision to strengthening transportation in Jabodetabek. Light Rail Transit (LRT) becomes a prominent answer to solve this problem, integrating the suburban to an urban area and reduce the traveling time. This paper evaluates the impact of LRT Jabodetabek in improving the capacity of traffic for the Greater Jakarta area and measure the effectiveness of LRT Jabodetabek. From this study, the analysis showed the positive contribution of LRT Jabodetabek in improving the longing dilemma by 2025. The paper also suggested future development of LRT Jabodetabek in optimizing the effectiveness through expanding its routes.
Evaluating the Effectiveness of Road Humps in Reducing Vehicle Speed: Case Study of a University Campus
Authors: Mashros Nordiana , Md Nor Muhammad Faizudin , Kurnia Aztri Yuli , Hassan Sitti Asmah , Hassan Norhidayah Abdul , Mohd Yunus Nor Zurairahetty
Published: April 2020

Road humps are designed to control the speed of vehicles through the discomfort that drivers experience when crossing over them. Although the use of various types of road humps in low-speed environments is common, its effectiveness has yet to be seen. This paper evaluated the effectiveness of different types of road humps in reducing the speed of vehicles at a university campus. Field observations were carried out to determine geometric designs of five round-top and five flat-top road humps. All recorded design characteristics of road humps were compared with the standard specifications by various authorities. Only road humps that met any one or more of the standard specifications were considered for speed data collection. Speed data were observed at two selected points during off-peak weekdays and in daylight conditions. A comparison of the observed design characteristics of the road humps with the standard specifications by the authorities showed that most of the humps did not meet any design standard except one round-top road hump and two flat-top road humps. However, only one round-top and one flat-top road humps were considered for further analysis. The average speed of vehicles approaching the road humps was found to be higher than the average speed observed on road humps, with a reduction of 46% and 52% for round-top and flat-top road humps, respectively. The results of statistical analysis also showed that both types of road humps were effective in reducing the speed of vehicles. Thus, it can be concluded that road humps, irrespective of their type, have an impact on vehicle speed.
A Liturgical Relation with the Spatial Configuration and Architectural Form of The Catholic Church
Authors: Trisno Rudy , Lianto Fermanto
Published: April 2020

The phenomenon of the Catholic church after the Second Vatican Council has lost the expression of its sacred form. This study aims to trace the liturgical relation with the spatial configuration of the architecture form from the Catholic Church to get the Ideogram and Godly symbol that will influence the form of architecture of the Catholic Church and can be used as the interpretation of the case studies. The methodology used in this study is firstly, describing liturgical activities associated with the sacred form approach from Eliade, Hoffman, Jones, Barrie, and Martasudjita to trace the sacred concept of the functions of the liturgy and relate it with the anatomical approach of the floor from Salura. Secondly, obtain a reference to the spatial configuration and reference to the architectural form of the Catholic Church. The aim of all these approaches is to obtain the spatial aspect configuration and form aspects. The findings of the spatial configuration or Ideogram and form of Catholic Church architecture are the Godly symbols, as well as the framework for the interpretation of case studies. The results conclude that the Catholic Church form is a symbol of divinity and Ideogram. Thus, if the scope of the environment, tread, building, and figure corresponds to the aspect of reference in creating sacred value, then the architecture of the Catholic church assumable radiating a sacred expression.
Experimental and Analytical Investigation of Hybrid Layer Thickness Effect on Replacing the Rebar for Reinforced Concrete Beams
Authors: Qasim Ola Adel , Fayadh Omer Khalid , Farhan Omar Shamal
Published: April 2020

Many researchers emphasize the effectiveness of steel fiber to replace the reinforcing bar in the reinforced concrete structural elements. The fiber of different types, sizes and geometries have been added to the concrete mix with a pozzolanic material to produce Ultra-High Strength Concrete (UHSC), which has excellent properties, high strength, and durability. This paper is a lab work and theoretical study consisting of casting and testing. Twenty-one simply supported RC beams to examine the beam's behavior and the shear capacity with the full or partial depth of UHSC with or without steel fibers (UHSSFRC) for replacing the reinforcing bars. The beams were divided into five groups. Preliminary experiments tests were conducted and carried out to study hardened properties of concrete such as (compressive strength, splitting tensile strength, modulus of rupture and modulus of elasticity). The selected finite element program (ANSYS) was applied to model all tested beams. It was observed that the performance of the finite element representation gives and shows good agreement with the lab work results. The test consists of failure load, deflection, cracks and failure mode. The experimental laboratory work results showed that for (1% steel fiber with reinforcement ratio Ï=0.0105 full UHSC layer) was able to give the same shear capacity for beam with (reinforcement ratio Ï=0.0157 regular concrete), while for (2% steel fiber half UHSC layer and reinforcement ratio Ï=0.0105) was able to give the same ultimate shear loads of beam with (reinforcement ratio Ï=0.0157 normal concrete). This research reveals that the hybrid layer and steel fiber effects were able to substitute for a higher reinforcement ratio with the same shear capacity.
Development of a Revenue Model for Buyers in Co-Creation Environment
Authors: Park Young Jae
Published: April 2020

With the advancement of information communications technology (ICT) and dissemination of mobile devices, new businesses are constantly emerging, and collaboration and cooperation between suppliers and consumers are also leading to innovation. Furthermore, to enhance consumer loyalty or to attract new customers, marketing activities are further advancing by utilizing cutting-edge information technology. In particular, user experience is highly emphasized, influencing the stages of planning and developing products, and is even used as a means of marketing. Creating new value and joint innovation through direct customer engagement is indeed a new challenge from design to production, marketing, sales, and delivery of products or services. Personal information on the internet is rapidly increasing due to the advancement of information technology which leads to an increasing use of social networking services and web search, as well as easier access to the internet itself. More companies are attempting to link corporate strategies to the analyses of such personal information and customer propensity or preferences, which is considered key to corporate success. As such, the mobile environment has become a new business tool and channel for sales and purchase for both companies and customers, and new business models to utilize mobile devices are emerging. Services can use the user location to provide information on the areas or shops near the user. User profile can also be provided to advertisers and product sellers, and the advertisers can advertise products that certain users may be interested in based on the user profiles. Users can compare the lowest prices and get information on the related or similar products. This study suggests a buyer revenue model based on such scenario and reviews the technical issues in implementing the model.
Platformisation of Mobile Operators Business Model: A Proposition Using Design Science Approach and Grounded Theory Principles
Authors: Hmoud Aladeen Y. R. , Salim Juhana , Yaakub Mohd Ridzwan
Published: April 2020

Mobile network operators (MNOs) business models (BM) are under pressure due to their lesser capability of introducing superior values to their customers in the mobile ecosystem. However, recent research efforts in developing new BM advocate two-sided BM that encompasses the diversity of MNO’s activities and capabilities. As a result, a new multidisciplinary service-based two-sided BM needs to be developed that incorporates these activities and skills. The small body of the extant literature on the subject suggests that it may be possible to enhance MNOs' BM by combining contemporary information technology tools with managerial design principles and concepts. This study designs a two-sided mobile advertising BM to investigate the application of a big data-driven BM to transform MNOs' current one-sided BMs to two-sided ones. To accomplish this, it combines the design science research methodology (DSR), which aims to create a problem-solving artifact for real-world problems, and the grounded theory approach, which aims to develop substantive theory and increase the rigor of the design process. The initial BM was proposed using deductive and adductive reasoning from academic and grey literature. The results of this study have shown that the new BM can enhance their revenue streams and competitive edge. This study identified that successful BM should be built on established MNOs core competencies and business activities. This study showed the applicability of two-sided theory and big data-driven tools and technologies to create new superior value propositions to both advertisers and end-users and thus innovative BMs for MNOs. The paper concludes with the fundamental requirements to build a data-driven two-sided BM.
Kualanamu International Airport: Current Development toward Aerotropolis
Authors: Sefrus Tri , Priyanto Sigit , Parikesit Danang , Dewanti - , Irawan M. Zudhy
Published: April 2020

Nowadays, an airport is no only a place for passengers to come and go, but it plays a significant role in developing and driving the local economy. Realize or not, there will be urban areas that offer connectivity at the airport (aerotropolis), and each airport has different aerotropolis potential. This study aims to analyze changes occurring around Kualanamu International Airport during the pre-construction and post-construction of the airport in 2007 and 2013. Six of the seven criteria of the establishment of aerotropolis show positive results, including air traffic, connectivity, sustainable development, economic income, government support, and Demographics. Significant growth was seen in the added value of the industry, the size of the industrial area, and the increase in GDP per capita. The added value of the industry has an average growth of 99.72% per year from the previous only 1.4% per year, the total area of the industry increased to 780 hectares from the previous only 200 hectares, and the GRDP also more than doubled. The only criterion that has not shown a positive potential is the status of ownership and management by the private sector because until now there has been no partnership in managing Kualanamu International Airport. To realize the development of the concept of aerotropolis in this region, the role of government and stakeholders is needed, both for policies related to aerotopolis development, public-private partnership discourse, the form of partnership, the concession period, and its contribution to the area around the airport.
3D Object Pose Estimation Using Chamfer Matching and Flexible CAD File Base
Authors: Sari Dewi Mutiara , Eka Putranti Vina Wahyuni
Published: April 2020

Estimating the object pose is an interesting topic in the industrial robotic vision field. By having an accurate result for detecting object pose, it means the system performs the task as the target in the bin-picking technique. The methods which are developed are varies widely. But the challenge for this paper is estimating a 3D object using mono camera accurately. The object which is used in this paper has the symmetric rotational shape, in this case is the sprayer. In this paper, the camera uses a tool from the Blender Software, such that the ground truth is measurable and it will be the reference for calculating the error. The applied algorithms of this paper are Border Line Extraction Algorithm utilized in the template generation step as the reference template, Directional Chamfer Matching for detecting the coarse pose, and Lavenberg-Marquardt Method to optimize the object pose result. The result achieves the average error of the coarse pose for x and y position (translation pose) are 2.05 mm and 0.71 mm. Meanwhile for the optimized pose, the average error for x and y position (translation pose) are 1.82 mm and 0.24 mm. Regarding the rotational pose, the average error of the rotational coarse pose with respect to x and z axis are 0.01 degree and 0.45 degree. Whereas the average error of the rotational optimized pose with respect to x and z axis are 2.88 degree and 0.82 degree.
Empowerment of Subsistence Craftsmen through the Adoption of Environmentally Friendly Cocodust Production Technology
Authors: Dumasari - , Darmawan Wayan , Ismangil - , Dharmawan Budi , Santosa Imam
Published: April 2020

The adoption of environmentally friendly production technology supports the empowerment of subsistence craftsmen through product diversification. However, a study of cococraft craftsmen in Purbalingga District, Purbalingga Regency Province, Central Java, Indonesia, revealed that the factors restricting the adoption of technology in cocodust production were technological complexity, limited capital, and social rigidity. The craftsmen had little awareness of the functional and economic benefits of cocodust. The adoption of new technology was unsuccessful due to a lack of evaluation of the cocodust characteristic regarding compatible, complex, observable, and triable aspects. Subsistence craftsmen were unsure of the characteristics of the facilitators of new technology, especially concerning economic value, a sense of belonging, production costs, accessibility, and social benefits. The key research output of this in-depth case study was a management scheme that could be used to facilitate technology adoption. The essence of this management scheme was to prompt a change in behavior at each stage of adoption through counseling, networking, sharing, and continuous advocacy. Continuous cocodust productivity would also reduce cococraft waste. Market security and price feasibility were also supporting elements, helping to guarantee additional income and thereby leading to the empowerment of the craftsmen. If the management scheme were to lead to technology adoption, it would provide a solution to the problem of the scarcity of agricultural land. Cocodust products can also be used effectively as a seedling or planting media on organic farms, especially those on the narrow and marginal area.
Automatic Detection of Fetal Head and Fetal Measurement on Birth Time Estimation
Authors: Sigit Riyanto , Rahayu Khusnul Danny , Nadiyah Putri , Yuniarti Heny , Anwar -
Published: April 2020

Fetal biometry in ultrasound (USG) is a routine activity that can be used to determine the gestational age of a baby. Accuracy is needed when measurements are made. However, the low quality of ultrasound images and manual measurement that takes a long time and give rise to many different variations of values from each doctor or sonographer. Thus the measurement results obtained are less accurate. From these problems, the development of automatic detection and measurement of the fetal head is needed. One of them is by using a learning-based system method that will carry out the training process using Haar training to get features. The training process with the Haar method uses positive image data as objects and negative images as background. Haar training data that have been obtained, then used to detect fetal head objects automatically. Detection results are then processed to separate the object from the background image, which is then carried out the segmentation process to obtain the fetal head and fetal femur. Then the segmentation method used is Integral Projection to get the fetal head circumference and Find Contour to get the fetal femur. The parameters used to determine gestational ages are biparietal diameter and femur length. Based on experiments that have been done, obtained an accuracy rate of 97.77% using the proposed method for estimating gestational age automatically. Measurements are obtained by comparing the results of the doctor's diagnosis using manual measurements on an ultrasound machine.
Artificial Neural Network Based Machining Operation Selection for Prismatic Components
Authors: Natarajan K.K. , Gokulachandran J
Published: April 2020

Computer-aided process planning systems are used to assist human planners in producing better process plans. New artificial intelligence techniques play a significant role in CAPP. CAPP research includes neural network approaches, knowledge-based techniques, Petri nets, agent-based, fuzzy set theory, genetic algorithm, Standard for the Exchange of Product model data (STEP)-Compliant CAPP, and Internet-based techniques. This study deals with the application of the Artificial Neural Network techniques (ANN) in CAPP because of their learning ability and massive potential toward dynamic planning.  This study focuses on the usage of artificial neural networks machining operation selection and sequences of operations for prismatic components. The intelligent CAPP system suggests the best machining operation and its sequences for the prismatic components using tolerances, material requirements, and surface finish details. The process planning of machining features in part is the starting point. An enormous amount of knowledge is required for part feature process planning, like selecting proper material, size, stock, dimensional tolerance, and surface finish. In this work, various prismatic features, such as a hole, slot, pocket, boss, chamfer, fillet, and face are taken and details like material, size, stock, dimensional tolerance and surface finish are properly normalized and given as input to neural networks to find the required sequence of machining operation. LevenbergMarquidt algorithm was used to train the networks and was found very effective in operation sequence selection. A sample prismatic component with nine features have been analyzed and found to be more productive. Levenberg Marquidt  algorithm is then compared with the conjugant space algorithm, and it is found that the former produces less error in outputs compared to them later.
Contribution of Production-Based Learning, Student Engagement, and Locus of Control towards Entrepreneurship Learning Outcomes in Engineering Education
Authors: Yulastri Asmar , Hidayat Hendra , Ganefri - , Yondri Surfa , Ifdil Ifdil
Published: April 2020

This study was motivated by entrepreneurship learning outcomes in engineering education that could not have a significant positive impact on students’ interest in entrepreneurship. Currently, entrepreneurship learning is boring, predictable, and has not provided a good learning experience. This study described and tested the contribution of production-based learning, student engagement, and locus of control to entrepreneurship learning outcomes. This research used a quantitative method. The population was all students who take the entrepreneurship course in engineering education for 2,600 people, and the sample is 307 students. The research instruments used a reliable and valid Likert scale and the test for assessing entrepreneurship learning outcomes. Data were analyzed using parametric statistics. The results obtained from this research; there is the contribution of production-based learning, student engagement, and locus of control to the entrepreneurship learning outcome. Production-based learning provides an opportunity for students to be directly involved in a collaborative learning process. Besides, the raising of internal locus of control, for the level of confidence of students in the learning process, has a good impact on the entrepreneurship learning outcome students. The process of learning entrepreneurship by applying production-based learning also becomes more meaningful. It gives an influence on external locus of control, such as job opportunities and readiness in the community to be well open. Thus, it also automatically contributes to the improvement of the quality of graduates in engineering education.
Adsorption of Petroleum Fractions on Organo-Modified Calcium Bentonite
Authors: Charles Oraegbunam , Nnaemeka Ngobiri
Published: April 2020

This work aims to obtain an organoclay from a local Nigerian bentonite with Cetyl trimetyl-Ammonium bromide (CTAB), a quaternary ammonium compound which possesses surfactant properties. The studied natural bentonite (calcium bentonite) was obtained from Anambra state and modified with CTAB via impregnation techniques. Modification was achieved by varying the concentration of the modifier from 0.02 - 0.15mol/L. Adsorption test was carried out using Water, Petrol (PMS), Kerosene (DPK) and Automotive Gas Oil (AGO) on both modified and unmodified bentonite. The result showed that unmodified bentonite adsorbed more water than hydrocarbons while Modified bentonite adsorbed more hydrocarbons than water. The result also shows that the amount of each hydrocarbon adsorbed increases with an increase in the concentration of the modifier with a subsequent decrease in the amount of water adsorbed. This indicates that the modified bentonite was now organophilic. Therefore, this research shows that the bentonite modified with CTAB can be used in oil spill remediation and also to mop up hydrocarbons from the Environment.
Homocysteine Levels in Patients with Human Immunodeficiency Virus and Acquired Immunodeficiency Syndrome in Ibadan
Authors: OLUTOGUN TOLULASE , FASOLA FOLUKE , Olufemi-Aworinde Kehinde , AKEN'OVA YETUNDE
Published: April 2020

Introduction: Homocysteine is produced from the conversion of methionine to cysteine. Conditions resulting in hyper homocysteinemia leads to an increased risk of both arterial and venous thromboembolisms by about 2 fold. 20% of HIV infected patients with objective evidence of venous thromboembolism are found to be thrombophilic with higher homocysteine levels. We enquired into homocysteine levels prior to the development of a clinical evidence of a venous thrombus in both HAART naïve and those on HAART of HIV /AIDS population. We evaluated the association between homocysteine, CD4 lymphocyte count and ART use in order to identify possible risk factors for hyper homocysteinemia in HIV population.

Method: Employing a cross sectional design; we compared mean plasma levels of homocysteine, full blood count parameters and CD4+ lymphocytes counts in HIV positive patients and HIV negative controls. One hundred and twenty patients with HIV infection attending the APIN clinic at the University College Hospital Ibadan and St Mary’s Catholic Hospital Eleta Ibadan and one hundred and twenty-six HIV negative healthy controls were compared in the study.

Results:  Fifty-nine point one percent of the HIV positive patient had hyperhomocysteinemia i.e. homocysteine levels of >18µmol/l. The mean plasma homocysteine levels were significantly higher at 24.4µmol/l (SD=13.8) (CI -2 to -8; p=0.002) in the HIV positive group compared with 19.5µmol/L (SD=10.6) in the control group.  The use of Anti-retroviral drugs was not associated with higher homocysteine level in the seropositive group and neither were factors like age, gender or the use of combined oral contraceptive pills. There was no correlation between CD4 cell count and homocysteine levels (r= -0.01; p=0.9).

Conclusion:  Homocysteine levels are elevated in HIV positive patients and hyperhomocysteinemia was found in a significant number of HIV positive patients. None of the patients investigated had features of thromboembolism or outright deep venous thrombosis. Neither CD4 cell counts nor traditional risk factors were associated with the higher homocysteine levels.
Markers of Disease Severity Amongst Homozygous Sickle Cell Anaemia Attending Outpatient At Bowen University Teaching Hospital Ogbomoso, Nigeria.
Authors: Olufemi-Aworinde Kehinde , Olutogun Tolulase , Abolarin Ademola , Olasinde Yetunde , Gbadero Daniel
Published: April 2020

Introduction: Genetic, cellular and molecular modifiers are responsible for the notoriously variable sickle cell phenotype. Haemoglobin F is a principal modulator of the SCD phenotype. Haemoglobin F inhibits the polymerization of Haemoglobin S and ameliorates the secondary effects of sickling. We measured the Haemoglobin F(HbF) in our population and compared it with other markers associated with clinical severity and clinical status of the patients.

Methods: we randomly selected 40 Hemoglobin S(HbS) patients who have never taken hydroxyurea. We measured hemoglobin F levels, packed cell volume (PCV) and reticulocyte count to serve as markers for hemolysis, neutrophils, platelets and MCHC to serve as markers for clinical severity. We searched for a relationship between these laboratory features and frequency of vaso-occlusive crises, transfusion history and number of hospital visits per year. They were compared with  twenty healthy Hemoglobin A (HbA) controls.

Results: Packed cell volume was significantly lower and the reticulocyte was significantly higher in the hemoglobin S compared with controls. The platelet count of the sickle cell anaemia patients was more than twice the number of the controls. The mean hemoglobin F level was 7.1± 3.5 %. The hemoglobin F was negatively correlated with the platelet count but positively correlated with the total white cell count and haematocrit but there was no significant correlation between hemoglobin F and clinical features

Conclusion: The fetal hemoglobin level may not be the only modifier responsible for phenotype in  population of hemoglobin S
Arab Knee: Management and Prevention-A Case Report
Authors: J Inklebarger , N Galanis , Akhtar A  , Stone H  , Adel G  , Farooq G  , Gyer G  , Michael J  , Bernardotto M
Published: April 2020

Radiographic osteoarthritis of the knee is very common in Saudi patients, especially in the patellofemoral compartment.

Some studies have considered repetitive daily prayer activities as a factor of causation. However prevention and management recommendations appear to be non-existent in the literature. This report describes the case of chronic bilateral anterior knee pain in a devout adult male, which was dramatically alleviated by simply using a padded cushion under the prayer rug. Simple strategies of temporarily modifying prayer posture, insuring good prayer form, and adequate knee padding, may offer promise as low tech and economical solution for the management of anterior knee pain in this cultural group.
Oral Health Knowledge Among Of Student Elementary School in Sumedang City, Indonesia
Authors: Sopiatin Siti , Susanto Agus , Metta Prajna , Rusyanti Yanti
Published: April 2020

Prevalence of dental and oral diseases in Indonesia is high and tend to continue to increase. This study aims to determine the level of oral health knowledge of grade V and VI students at Tanjungsari III Elementary School in Sumedang City. Methods: This research is a quantitative descriptive study with cross-sectional research design using questionnaire. The study population was students at Tanjungsari III Elementary School with a total of 62 students (26 male and 36 female). Analysis of the data in this study was quantitative descriptive analysis techniques with percentages using three assessment categories, named: High, Medium, and Low. Results: The results of the study of the level of knowledge about oral health of students mostly in the medium category amounted to 69.35% with a total of 43 students. Whereas in the high category it was 14.52% with a total of 9 students, the low category was 16.13% with a total of 10 students. Conclusions: The level of  oral health knowledge of the fifth and sixth grade students of Tanjungsari III Elementary School in Sumedang was the medium category. Continuous education and preventive measures to prevent  oral diseases early were needed on elementary school students.