bluuebunny/crossref_metadata_2025 huggingface dataset:
ANALISIS BIAYA DAN PENDAPATAN PETERNAK AYAM BROILER DI KOTA SEMARANG
Authors: Mulyaningsih Dwi Umi , Prastiwi W D , Sarengat W
Published: April 2020

ABSTRACT

The research intends to know the cost and income broiler breeders in Semarang City. Reasearch obtained by breeders in Gunungpati district and Mijen district. The method use in this research is survey method with purposive sampling method. The study look place from January until February 2015. Data collection consisted of primary and secondary data. Primary data obtained from the observation and interviews of respondents. The results of this study show calculation there is no difference in cost and income between broiler breeders in Gunungpati district with Mijen district. The results show that the average cost of broiler breeders in Gunungpati district Rp 198.003.520,04 and in Mijen district Rp 183.488.974,87 and the average income of broiler breeders in Gunungpati district Rp 14.422.095 and in Mijen district Rp 17.209.832. There is no difference in cost broiler breeders in Gunungpati district and Mijen district with significance value 0,627>0,05, and there is no difference in income broiler breeders in Gunungpati district and Mijen district with significance 0,653>0,05.

Keywords: Broiler chicken, cost, income, breeders.
ANALISIS USAHA PENGOLAHAN KOPI ROBUSTA DI KECAMATAN GEMBONG KABUPATEN PATI
Authors: Sari Riski Anjar , Awami Shofia Nur , Widiyani Aniya
Published: April 2020

ABSTRACT

Gembong subdistrict is producing coffee area in Pati Regency which is processed into black coffee powder and green coffee powder. This research aims to know the value-added, income and eligibility processing robusta coffee. The basic method of research used descriptive method. Location retrieval methods of research with purposive sampling. Sampling of respondents by the census method, data collection by way of interviews, observation and record-keeping. The data analysis methods are added value, cost, revenue and earnings, and also feasibility analysis BEP and R/C. The results showed there was a difference in the average of ratio value added processing black and green coffe powder they are 43.52% and 48.06%, the average revenues of coffee powder processing black and green respectively is Rp. 360.592/PP one week and Rp. 580.313/PP one week, the average of breakeven black coffee powder and green coffe powder a value of BEP (Production) 10.90 kg and 4.91 kg (the real are 12.48 kg and 6.84 kg), BEP (Price) of Rp. 90.813/kg and Rp. 154.489/kg (the real are Rp. 104,000/kg and Rp. 215,000/kg) and BEP (Acceptance) of Rp. 751.431/PP one week and Rp.379.426/PP one week (the real are Rp. 1.297.920/PP one week and Rp.1.470.600/PP one week), and R/C value of black dan green coffee powder processing are 1.38 and 1.65.

Keywords : Value Added, Robusta Coffee, Black Coffee, Green Coffee, Gembong
PEMANFAATAN HASIL FERMENTASI LIMBAH CAIR TEH HIJAU PADA FREKUENSI PENYIRAMAN YANG BERBEDA TERHADAP PERTUMBUHAN BIBIT KARET (Hevea brasiliensis Mull. Arg)
Authors: Muningsih Retno , Majing Farhan Wardhana
Published: April 2020

ABSTRACT

This research aimed to know the differences influence the frequency of watering fermentation liquid waste green tea on early growth of rubber plant seed. This research method using Randomized Complete Block Design (RCBD) non factorial, i.e. the granting of fermentation liquid waste green tea with a dose of 10 ml/poly bag with 3 treatment. As for the extent of the treatments given are control (P0), the frequency of watering every two weeks (P2), the frequency of watering every four weeks (P4). Each treatment was repeated five times so that there are 15 units of the experiment. Each unit is comprised of 1 trial crops so that there is a total of 15 plants. The giving of liquid organic fertilizer from waste liquid fermented green tea can enhance plant growth include rubber, i.e. plant height, number of leaves, green leaves, heavy wet and dry long & root plant rubber. On treatment of P2 (the frequency of watering every two weeks) show the highest results and good than P0 treatment (control) and P4 (the frequency of watering every four weeks).

Keywords: fermentation, tea liquid waste, liquid organic fertilizer.
TAMPILAN GULA DARAH , LAKTOSA DAN PRODUKSI SUSU SAPI PERAH LAKTASI YANG DISUPLEMENTASI BAKING SODA (NaHCO3)
Authors: Kurniawan Raymond C , Budiarti C , Sayuthi S M
Published: April 2020

ABSTRACT

This study aims to determine the effect of the addition of baking soda as a supplement of dairy cattle feed on blood sugar, lactose, and milk production. This study used the dairy cow FH lactation of the 2nd lactation period of 5th month lactation and 6th lactation of 12 with 2-3 years old. Dairy cow FH lactation has a weight of 389.17 ± 27 kg. The treatment used was the addition of baking soda with the level of 0.8% and 1.0%. This study used a ration consisting of soybean meal, corn, brand, meat bone meal, lactoplus and forage grass uganda feed. This study used a complete randomized design consisting of 3 replication and 4 treatments. The data obtained were analyzed using variance analysis and F test at 5% level. The results showed that the addition of baking soda as supplement had no significant effect on blood sugar, lactose, and milk (P> 0,05), but it can increase milk production without supplementation (T0). The conclusion of this research is that the addition of baking soda at the level of 0.8 and 1.0% has no significant effect on blood sugar, lactose, and cow milk production.

Keywords: Baking soda,blood sugar,lactose and production of diary milk
ANALISIS KOMPARATIF KELAYAKAN USAHATANI PEMBIBITAN TOMAT (Lycopersicon esculentum Mill) VARIETAS SERVO DAN LARISA DI DESA BANYUKUNING KECAMATAN BANDUNGAN KABUPATEN SEMARANG
Authors: Agustin Nika Shella , Subantoro Renan , Prabowo Rossi
Published: April 2020

ABSTRACT

Horticultural crops are that have great prospects subsectors, due to their high demand and relatively high commercial value. The purposes of this research were to determine revenues, incomes, RC Ratios, and to compare the income levels and RC Ratios of seedling both Varieties of Servo and Larisa. The research method used in this research was a descriptive analytical method, and the sampling method applied to it was a purposive sampling. This research was conducted in the Banyukuning Village, Bandungan District, Semarang Regency. Fifteen respondents were taken in this research and using the census method, all of these respondents were farmers who were actively seedling tomato. The data was obtained from primary and secondary data by conducting observation, interview, questionnaire, documentation, recording, and literature review. The analytical methods used feasibility analysis and statistical analysis (independent sample t-test). The analysis showed that Servo succeeded to obtain revenue of Rp.4,971,400.- while Larisa gained Rp.1,369,000.-. In relation to income, the first variety reached Rp.1,938,048.18, while the later earned Rp.519,438.39. Additionally, the value of R/C of Servo variety was 1.62, while that of Larisa variety was 1.55. Between Servo and Larisa Varieties in terms of revenue there is significant difference, while in terms of the value of R/C there is no significant difference.

Key words: Seedling, Revenue, income, Feasibility, comparisons.
ANALISIS FINANSIAL PETERNAKAN AYAM PETELUR SUROSO FARM DESA BAKALAN KECAMATAN POLOKARTO KABUPATEN SUKOHARJO
Authors: Pambudi Andhyka Wahyu , Setiadi Agus , Sarengat Warsono
Published: April 2020

ABSTRACT

The purpose of this research were to know level of profit, capability of getting profit, capability of return investment, time capability of return investment, capability to know ratio of getting profit from production cost on Suroso Farm of layer chicken. The data which to be analyzed was primary data taken from interview and secondary data taken from institution. This research use kind of type financial analyzed Return On Investment (ROI), Payback Periode (PP), dan Benefit Cost Ratio (BC Ratio). The result of analyzed show rate of population Suroso Farm 35.870, ROI 68%, PP value to return investment 1 year and BC ratio 2,6. That means this company Suroso Farm is feasible to be going on and profitable.

Keywords: ROI, PP, BC ratio.
ANALISIS USAHA PENGOLAHAN ABON LELE DI DESA TEGALREJO KECAMATAN SAWIT KABUPATEN BOYOLALI
Authors: NurCholis Fuad Hanif , Sasongko Lutfi Aris , Widiyani Aniya
Published: April 2020

ABSTRACT

Shredded-catfish processing business is a business that produces floss with raw catfish as the main ingredient. The business of shredded-catfish in Boyolali Regency located in Kampung Lele, Tegalrejo Village, Sawit District. Shredded-catfish become the superior product in Boyolali and the surrounding areas. The purpose of this research are to determine the total production costs, the level of revenue, income, and feasibility of the shredded-catfish processing business in Tegalrejo Village, Sawit District, Boyolali Regency. The basic method that used in research was using descriptive analitycal method. Determination of the sample location was carried out purposely in Tegalrejo Village, Sawit District, Boyolali Regency. The data used are primary and secondary data. Data retrieval method used are interview, observation and recording. There are 23 respondents in this study from some business groups i.e Karmina, Pamuji and Alang-Alang. Data analysis method used are cost, revenue, income, R/C and BEP analysis. Research result from the study of shredded-catfish processing business in Karmina, Pamuji and Alang-Alang business group for one month respectively cost as much as Rp 24.043.591; Rp 26.055.548; and Rp 8.397.784. Those total cost consist of the cost of raw materials, fuel, packaging, depreciation of equipment, employee wages and electricity. Karmina group produces 276 kg of shredded catfish at a price of Rp 120.000/kg. Pamuji Group produces 336 kg of shredded catfish at a price of Rp 110.000/kg. Alang-Alang group produces 120 kg at a price of Rp 110.000/kg, so the total revenue of the Karmina group is Rp 33.120.000; Pamuji group’s total revenue is Rp 36.960.000; and Alang-Alang group is Rp 13.200.000. Total income of Karmina group is Rp 9.076.408; Pamuji group is Rp 10.904.451; and Alang-Alang group is Rp 4.802.215. The R/C values of the Karmina, Pamuji and Alang-Alang business group are respectively 1,37; 1.41; 1.57, so the business is feasible to do. The BEP unit value in the Karmina group is 100,36 kg, Pamuji group is 236,86 kg and Alang-Alang group is 76,34 kg, while the BEP price value in the Karmina group is Rp. 87,114.44; Pamuji group is Rp 77,546.27; and Alang-Alang group is Rp 69,981,53.

Keywords: business analysis, shredded-catfish, R/C, BEP
A statistical anytime algorithm for the Halting Problem
Authors: Calude Cristian S. , Dumitrescu Monica
Published: April 2020

In a previous paper we used computer running times to define a class of computable probability distributions on the set of halting programs and developed a probabilistic anytime algorithm for the Halting Problem. The choice of a computable probability distribution – essential for the algorithm – can be rather subjective and hard to substantiate.

In this paper we propose and study an efficient statistical anytime algorithm for the Halting Problem. The main advantage of the statistical algorithm is that it can be implemented without any prior information about the running times on the specific model of computation and the cut-off temporal bound is reasonably small. The algorithm has two parts: the pre-processing which is done only once (when the parameters of the quality of solutions are fixed) and the main part which is run for any input program. With a confidence level as large as required, the algorithm produces correct decisions with a probability as large as required. Three implementations of the algorithm are presented and numerically illustrated.
Multi-objective FACTS placement using improved harmony search optimization
Authors: Pandian Arun Nambi , Palanivelu Aravindhababu
Published: April 2020

Optimal placement of FACTS devices attempts to improve power transfer, minimize active power loss, enhance voltage profile and improve voltage stability, thereby making the operation of power systems more flexible and secured. The classical methods experience difficulties in solving the FACTS placement problem (FPP) with discontinuous functions and may diverge or result oscillatory convergence. Besides the number of FACTS devices for placement should be given as an input while solving the problem. The solution methods then attempts to forcefully place all the specified number of devices in the power system, but in reality, the system may require an optimal number of FACTS for placement. The application of swarm-intelligence based optimization algorithms strives to overcome the drawbacks of classical methods. This paper presents a new solution method for FACTS placement problem using improved harmony search optimization (IHSO) with a newly suggested dissonance mechanism that avoids badly composed music, with a view of avoiding the sub-optimal solutions. Besides, the method requires to specify only the maximum number of FACTS devices for placement and places only the optimal number of devices within the specified maximum number of devices. The paper also includes simulation results of three IEEE test systems for exhibiting the superiority of the proposed method.
Accounting for the influence of granule size distribution in nanocomposites
Authors: Yurasov A. N. , Yashin M. M.
Published: April 2020

This paper discusses the effect of the distribution of the granules size in nanocomposites on physical properties within the framework of the quasi-classical size effect. Methods of effective medium for describing nanocomposites are discussed. This paper also notes and discusses the contribution of various mechanisms that affect the optical and magneto-optical properties of such structures, especially in the IR region of the spectrum, where the quasi-classical dimensional effect is most pronounced. The Droude-Lorentz mode describes the contribution of the dimensional effect to the diagonal and non-diagonal components of the effective medium's permittivity tensor. The lognormal distribution of the granule size characteristic of many nanostructures is considered. Based on this approach, the dependences of the standard deviation on the value of the integral as a function of the average size of the granules were obtained. Based on the normalization condition, the numerical value of the standard deviation of the r values and the average particle size were analytically determined. This paper also discusses the fundamental significance of the results obtained – the possibility of applying this approach to all possible distributions. The found value of the average size of nanocomposite granules makes it possible to model various properties of nanocomposite structures, first of all, optical and magneto-optical properties, with the help of known methods within the framework of the effective medium approximation. This is especially important for describing the percolation transition in nanocomposites. The problem being solved is important and relevant, since many interesting and important effects are realized in such magnetic nanocomposites, such as the magneto-optical Kerr effect, the anomalous Hall effect, the giant magnetoresistance, and many others. The results obtained allow us to better describe materials that are widely used in modern electronics and nanoelectronics.
Some antecedents and outcomes of informal learning behavior in a virtual team
Authors: Thi Minh Chau Huynh , Manh Tuan Nguyen , Thi Lan Anh Truong
Published: April 2020

Virtual teams are commonly used in businesses to meet employees’ needs for teleworking. Meanwhile, informal learning is a social phenomenon that influences work outcomes in learning organizations. Understanding informal learning behavior with its important antecedents and outcomes is necessary, especially in the context of teleworking via electronic communication media as virtual teams. This paper proposes and examines a structured model that describes the relationships among employee-coworker relationship quality, psychological empowerment, informal learning behavior, job performance, and job satisfaction of virtual team members. The results show a positive relationship between ((i) job performance and job satisfaction, (ii) informal learning behavior and job performance, (iii) psychological empowerment and informal learning behavior, (iv) employee-coworker relationship quality and psychological empowerment. The employee-coworker relationship quality, psychological empowerment, and informal learning behavior can explain 30.3% of the variance of job performance, indicating the role of informal learning behavior and its antecedents on the work outcomes of virtual team members.
The relationships of technology readiness, perceived value, satisfaction, and continuance intention – A study of self-service technologies in Viet Nam
Authors: Tuyet Tran Thi , Tuan Nguyen Manh
Published: April 2020

Technologies have changed the way of doing business remarkably. The marketplace is being replaced by market space, where almost all products/services are embodied in digital forms and delivered through information-based channels. As a result, this study attempts to investigate the determinants of marketspace marketing, particularly of self-service technologies. More specifically, the study examines the relationships among technology readiness, perceived value, customer satisfaction, and continuance intention in using self-service technologies. Data was collected through a questionnaire survey on 179 users who have had experience in using self-service technologies (including internet banking, airline ticket online booking, and tours online booking) in Ho Chi Minh City –Vietnam’s largest city. Partial least squares structural equation modeling (PLS-SEM) was used to analyze the data. The results show that all of the six hypotheses were empirically supported. Specifically, (1) Technology readiness has a strong positive influence on perceived value, customer satisfaction, and continuance intention; (2) Perceived value shows a moderate positive impact on satisfaction and continuance intention; (3) Satisfaction has a significant positive impact on continuance intention. In terms of theoretical contributions, this study proposed a value-based framework to predict continuance intention and conceptualized technology readiness as a second-order formative construct, which better represents the content of the construct originally developed by Parasuraman (2000). In terms of managerial implications, marketing managers should pay special attention to TR when making decisions such as launching new SSTs, segmenting customers, or boosting customers’ TR.
Exploring the effects of customer’s values on motivation and co-creation behavior – a study of education service
Authors: Thi My Quyen Mai
Published: April 2020

Marketing theories recently emphasize the role of customers in a value co-creation process to create value for themselves. From service-dominant logic, value co-creation refers to interaction and resource integration between customers and other actors in the service ecosystem. To perform any behavior, from self-determination theory, intrinsic motivation is the key driver. The question is, why is there a difference between a customer’s intrinsic motivation when they participate in the value co-creation process? This study aims at proposing the model about the effects of three types of personal values, including self-direction: thought, achievement, and tradition on customer’s intrinsic motivation. The analysis is based on the context of higher education in Vietnam. The results indicate that all three types of personal values have a positive impact on customer’s intrinsic motivation. In addition, self-direction: thought is found to have the strongest positive significant impact on customer’s intrinsic motivation. Moreover, the results also prove the important role of intrinsic customer motivation in performing their value co-creation behaviors. Besides that, this current study provides some research gaps for further study on creating customer motivation through a value co-creation process.
Kaizen in quality improvement at SPBV factory
Authors: Thuy Quynh Loan Nguyen , Van Quoc Tran
Published: April 2020

The ultimate objective of manufacturing industries is to increase productivity with high quality. At present, many manufacturing companies are facing problems such as high defect rate, high inventories, high lead time, high costs of production, and inability to cope with customer orders. Kaizen is one of the powerful tools of lean manufacturing. Kaizen refers to continuous improvement in performance, cost, and quality. The main objective of this paper is to provide a background on kaizen, steps for kaizen implementation, and then a case study of Kaizen implementation has been discussed. This case study is to present an application of Kaizen to reduce cap defects at SPVB factory. The 10-step Kaizen method of SBF Group has been applied for an improvement project. Based on the company’s strategy, the project has identified the main problem of Oolong Tea + cap defects and found out the factors of the machine that were the root causes of this problem. Two groups of solutions have been proposed and implemented to overcome these causes: Restoration solution and Kaizen solution. As a result of the improvement project, the Oolong Tea + cap defect rate has decreased from 0.14% to 0.03%. Then the project has recommended the activities that need to standardize and identified future challenges for improvement.
Classification of service quality attributes using Kano’s model: the case at the outpatient department of Trung Vuong hospital
Authors: Thi Kim Quyen Nguyen , Bao Tuan Huynh
Published: April 2020

The quality of hospitals in Vietnam is the concern of not only patients, the healthcare industry, but also the society as a whole. As Vietnam’s economy achieves high growth, and the living standard is improved, healthcare becomes an even greater concern of Vietnamese, and hospitals need to improve their quality to better satisfy their patients. However, few hospitals in Vietnam aware of the importance of factors affecting patient satisfaction. This paper aims to determine and classify the service quality attributes. In addition, it also identifies the factors that influence patient satisfaction at the Outpatient Department of Trung Vuong hospital. The research framework is developed from the study of Harijith & Haris (2017). The results from the qualitative survey show that there are 33 characteristics affecting the patient satisfaction, of which the "Short wait time" receives the highest score (0,76), and the “Physician competency” receives the lowest score (-0,91). Based on the results, some recommendations are proposed to improve service quality so as to better meet the current and potential needs of patients.
Leanness assessment: a study on JVN company
Authors: Thi Duc Nguyen Nguyen , Thi Huong Giang Tran , Kim Hao Ngo
Published: April 2020

This study focuses on reviewing, analyzing, comparing lean assessment methods/tools from previous researches, and selecting an appropriate method/tool, and then applying the selected one to evaluate the leanness level in the specific company. Literature review and case study research at JVN-Company are conducted in this study. The result finds that: (a) LAT developed by Pakdil & Leonard (2014) is the effective tool to measure efforts in implementing Lean and identify wastes from Lean perspective within an enterprise; and (b) By applying LAT to assess the leanness level at JVN company, the results show that JVN company has achieved the leanness level at 68,58%; while Customer dimension has the highest LAT score showing that JVN has high customer satisfaction and loyalty. However, the delivery dimension, particularly late delivery, is in special need of improvement in comparison with other dimensions. Accordingly, a few proposals have been recommended for JVN to consider and adopt the appropriate ones to improve its performance. Overall, the results of this study provide helpful references for manufacturing companies in Vietnam to self–assess their leanness comprehensively, thereby developing the proper and effective roadmap for Lean transformation.
Board independence and earnings management – a study of listed companies on Ho Chi Minh stock exchange
Authors: Phuong Nhi Doan , Thu Hien Nguyen
Published: April 2020

Board independence is reflected in many aspects, the most common of which is the existence of independent non-executive directors and the separation of Chairman and CEO roles. This study examines whether a highly independent board deters earnings management by its managers. Discretionary accruals are used to measure earnings management while current operating cash flow divided by lagged assets of current and future are used to measure manager's incentives. On a sample of 1230 observations from 244 HOSE listed companies that belong to VNX Allshare index in the period 2012-2017, this study provides significant evidence for corporate governance issues of Vietnamese listed companies. Specifically, the experimental results show that when the current period performance is poor and expected future period performance is good, and if one person holds both Chairman and CEO roles, he will carry out the transfer of a part of the future profits to the present to improve current year’s performance to satisfy personal interests. Unfortunately, all variables related to independent directors are statistically insignificant, confirming the fuzzy role of independent directors in monitoring and preventing earnings management in particular and agency problems in general. This study offers implications for the effectiveness and substance of the independent role of the board of directors in Vietnamese enterprises.
Mapping the reasons for resistance to using public transportation in Ho Chi Minh City
Authors: Thi Thanh Xuan Le , Thi Hien Vi Le
Published: April 2020

Traveling by bus brings many benefits to passengers. However, the growth of passengers using the bus as a means of transport remains slower than that of population and private transportation. This places a strong pressure on urban traffic in Ho Chi Minh City (HCMC). This study aims to explore the attributes of the bus system in HCMC, affecting various values that prevent passengers from using the bus. The study employs the Means-end chain theory as the frame and soft-laddering interview to collect data. Data collected from 36 interviewees, including 25 passengers and 11 experts, is analyzed by Association Pattern Technique (APT) and presented in a Hierarchical Value Map (HVM). The findings show that there are 18 attributes, 27 consequences, and seven individual values preventing passengers from traveling by bus in HCMC. Six key attributes are identified, including not convenient and far bus stations, many stops during the trip, not accurate schedule as planned, ticket collector’s poor behaviors, too many passengers on a bus, thief, or sexual harassment. These attributes lead to a negative impact on key (individual) values, such as Safety, Time control, Health problem, Convenience, and Respectfulness. From these findings, some suggestions are proposed to improve the frequency of bus using in HCMC.
Path following of unmanned surface vessel under the effect of position measurement noise
Authors: Ngoc Huy Tran , Nguyen Nhut Thanh Pham
Published: April 2020

A manipulation system for unmanned surface vessels (USVs), as well as other unmanned vehicles and autonomous vehicles, are commonly built up by three vital components which are guidance system, a navigation system, and control system, regardless of the mechanical aspects. In which, the navigation system will first use sensors to measure and estimate parameters, then feedback to the guidance system and the control system as input data. Based on those data and assignments from the user, the guidance system calculates and outputs reference data for the control system. The control system will drive the vessel according to the reference data from the guidance system to achieve those assignments. However, the process of measuring and estimating, in fact, is always affected by disturbances, which cause input error for the guidance system. Consequently, the reference data provided by the guidance system will be skewed and confused the control system, thereby reducing the quality of control and may cause instability for the whole system. This paper examines the problem of controlling an unmanned surface vessel following straight paths created by the waypoints given by the user. To solve the path-following for straight line problem, the paper will build a guidance system using the Line of Sight (LOS) method with lookahead distance and design a controller using a Backstepping algorithm. In addition, this paper will also study, analyze, and propose a method to reduce the influence of position measurement noise on the process of calculating the reference data of the guidance system. Thereby, the quality of the built system will be guaranteed when operating under the influence of measurement noise. The results of the proposed method will be shown through simulation on MATLAB/SIMULINK software. These simulation results will demonstrate the effectiveness and feasibility of the proposed method.
Modeling, design, and control of low-cost Remotely Operated Vehicle for shallow water survey
Authors: Ngoc Huy Tran , Tan Dat Huynh
Published: April 2020

Shallow water zones, including lakes, ponds, creeks, and rivers, play a prominent role in the spiritual culture and economy of Vietnamese people throughout history. Therefore, numerous researches have been conducted in regard to this topic for many purposes, most of which focus on elevating the quality of life and safety. With the aid of new technology, modern platforms gradually replace conventional methods and reach a higher level of efficiency and convenience. This paper presents the research on design and control of Remotely Operated Vehicle (ROV) belonging to National key Laboratory of Digital Control and System Engineering. Basically, it is controlled by human pilots to move underwater and perform specifically pre-assigned tasks. The power supply and communication channel for the vehicle are connected from an onshore station via cable systems. There are several stages of the pipeline in implementing a full-scale ROV platform that must be studied carefully. Prior to the experiments in practical conditions, the proposed 3D model designed by SOLIDWORKS® and MATLAB Simulink® mathematical model analysis firstly provide a nonlinear plant in order to apply classical PID controllers and evaluate their feasibility through simulation process. The outer frame protects other components from being damaged or unattached, while the thruster allocation strategy from the simulated model enables flexibility in motion. A system of sensors and cameras collects data from an underwater environment for on-the-spot monitoring, or they can be captured for further post-analysis processes. After assembling all parts into a whole model, we launched the vehicle at the maximum depth of a pool as the condition of a shallow water survey. Optimistic experimental results have proved the ability of controllers even in case of the presence of external disturbances.
Study on analysis and design of a VIAM- AUV2000 Autonomous Underwater Vehicle (AUV)
Authors: Tran Ngoc-Huy , Chau Thanh-Hai
Published: April 2020

This paper presents the design of the VIAM-AUV2000 autonomous underwater vehicle (AUV) with a built-in cylinder for floatation and counterbalance. The modular structure, including mechanical design, electronic system, and control algorithm, ensures continuous operation for the vehicle at a depth of 50 meters underwater. The main content will consist of two parts: the mechanical implementation and the electrical system. The mechanical implementation part will focus on calculating ship hull profile and material selection; computing and simulating stress and distortion on ship hull and waterproof covering using finite element method with NX Nastran; analyzing and planning cylinder and counterbalance arrangements. At the same time, the advantages of hybrid AUV design inspired from the traditional one with thruster and fins, as well as the underactuated glider form using counterbalance and cylinder for diving and floating, are discussed specifically in the upcoming sections. The electrical system for the robot is also mentioned and clarified through the selection of sensors, actuators, and hardware design to ensure stable operation for the diving robot at a depth of 50m and operate continuously for long periods underwater by using traditional AUV mode and glider mode. Some experimental results of thruster and three-axis tilt estimators with an error of less than 1o are also presented in this paper.
Study of Design and Manufacture for One-Line Rice Color Sorting Machine
Authors: Tan Y Nguyen , Thanh Son Le , Quang Tuyen Tran , Huy Bich Nguyen , Truong Thinh Nguyen
Published: April 2020

Vietnam is one of the major paddy producers in the world in which rice processing to pass international quality standards is one of the huge problems that need to be solved. One of these problems is how to separate the different colored rice during the processing that plays an important role in improving the quality of rice for export. Therefore, the “Rice color separation machine” is important equipment of the rice harvested processing line. During the study to solve these problems at the LAMICO Company, a big company in the field of rice processing in Vietnam, we have designed, tested, and manufactured a machine for rice color separating by using the camera successfully. This device helps classify finished rice and whereby the export value of Vietnam rice also increases. After checking and experimental investigation the working of the machine directly in some rice processing factories in the Mekong River Delta, the results indicate that the machine works very efficiency and separate all different color rice mix in the processing line. This paper presents the mechanical design solutions for the adjust slide and spraying equipment position structural of the rice color separation machines. Slides, spraying equipment, and feeder are main structures in the mechanical cluster of the rice color separation machine, and their relative positions are important parameters in deciding the accuracy and response-ability of the spraying equipment as well as identifying rice lines of the cameras. This paper proposes the design calculation determining parameters of the relative distance for a standard working mode and make the gap adjustment mechanism for the color rice separator machine can best respond the part of the image recognition camera control.
The effects of the process parameters in electrochemical machining on the surface quality
Authors: Thi Bich Nhung Nguyen , Thanh Liem Dao , Quoc Thanh Truong
Published: April 2020

Based on the number of previous studies, this study aims to investigate the effects of process parameters of an Electrochemical Machining process, which are electrolyte concentration, the voltage applied to the machine, feed rate of the electrode, and Inter-Electrode Gap between tool and workpiece. Aluminum samples of 25 mm diameter x 25 mm height and 30mm diameter x 25mm height of the tool is made up of copper with a circular cross-section with 2 mm internal hole. The design of the system is based on the Taguchi method. Here, the signal-to-noise (S/N) model, the analysis of variance (ANOVA) and regression analyses are applied to determine optimal levels and to investigate the effects of these parameters on surface quality. Finally, the experiments that use the optimal levels of machining parameters are conducted to verify the effects of the process parameters on the surface quality of the products. The results pointed out a set of optimal parameters of the ECM process. The Inter-Electrode Gap between the tool and workpiece has extremely effected on these Material Removal rates and surface roughness. The Material Removal Rate increases with diseases in Inter-Electrode Gap, and Ra diseases with diseases in Inter-Electrode Gap. The experimental results show that maximum Material Removal Rate has obtained with electrolyte concentration at 100 g/l, feed rate at 0.0375 mm/min, the voltage at 15V, and Inter-Electrode Gap at 0.5mm. The minimum Ra has obtained with electrolyte concentration at 80 g/l, feed rate at 0.0468 mm/min, the voltage at 10V, and Inter-Electrode Gap at 0.5mm. This result has led to need studies on these parameters in Electrochemical Machining, which are improving productivities and surface roughness of the products.
Effects of Minimum Quantity Lubrication (MQL) on cutting temperature, tool wear and surface roughness in turning AISI-1045 material
Authors: Trong Quyet Tran , Hong Sam Luong , Minh Nhat Truong , Anh Son Tran , Thanh Liem Dao , Quoc Thanh Truong
Published: April 2020

The effects of cutting fluids to health, environment, productivity, and quality in machining operations have been discussed. MQL is a green technology that is gradually applied in mechanical processing. The article has introduced about MQL cooling lubrication method in mechanical processing. Some previous research results have been made to clarify the meaning of this method. In addition, the comparison of the outputs of MQL, dry, and wet methods has also been shown to show the effectiveness of the MQL method. Then, based on the MQL equipment being used at Tran Dai Nghia University, the authors designed the experiment to evaluate the impact of MQL parameters on the process outputs. Machining and optimization of that parameter. This paper presents the MQL parameters optimization approach in which the multi-response outputs based on Taguchi's L9 orthogonal array method is used. During the turning AISI-1045 steel, the cutting temperature, the maximum of tool wear, and the surface roughness were measured. The MQL parameters, which are the ratio of soluble lubricant and water, pressure of spray head, the flow volume of the emulsion was simultaneously optimized by taking the multi-response outputs using Taguchi based grey relational analysis (GRA) into consideration. In turning experiments, three different flow volume of emulsion Q (40, 60, 80 ml/h), three different levels pressure of spray head P (3, 5, 7 bar) and three different levels ratio of soluble lubricant and water R (4, 6, 8%) were used. Here, three mathematical models were created using response surface regression methodology. The experiments had been done to investigate the effect of the MQL parameters to the turning process. As a result, the set of optimal MQL parameters had been pointed out to simultaneously minimize the cutting temperature, the tool wear, and surface roughness. The Flow volume of emulsion 80 ml/h, Pressure of spray head 7 bar, Ratio of soluble lubricant, and water 6% was observed to be the most effective.
The waste remover in aquaculture ponds
Authors: The Truyen Le , Thanh Long Le
Published: April 2020

Over the past decade, Vietnam's shrimp industry has made great progress and brings Vietnam into the rank of the world's largest shrimp exporters. The development trend of the shrimp industry in the world as well as in Vietnam today is in the direction of intensive and super-intensive farming, technology innovation to enhance productivity and quality. However, the shrimp farming industry in Vietnam is facing many difficulties; one of them is the problem of environmental pollution, raising the negative impact on the economic effectiveness of farming. Causes are mainly due to excess food and untreated shrimp waste accumulated on the pond bottom surface and disintegrated to reduce dissolved oxygen concentration, release toxic gases such as NH3, H2S and create a favorable environment for harmful microorganisms to develop. Therefore, it is necessary to have a countermeasure to thoroughly remove waste from the farming environment. This paper introduces a general design of a waste remover, which is needed for shrimp farming ponds to remove waste and solve the mentioned problem. This equipment moves on the bottom surface of the pond and can be autonomous or manually remote controlled. During the working process, the equipment brushes waste on the bottom surface of the pond and suck it into the filter bag. The waste remover includes such following main units: traveling unit, brushing unit, sucking unit, frame unit, transmission, and control systems. The equipment uses the principle of axial pumping, sucks waste along the water stream by reducing the pressure inside the equipment, and transfers waste into filter bags. This general design basically meets the requirement of waste removal and can be fundamental for designing the detailed units, manufacturing, and experiment implementation of equipment in the future.
Experimental operation and performance evaluation of waste remover in aquaculture ponds
Authors: The Truyen Le , Thanh Long Le
Published: April 2020

The development of new technologies in automation to increase labor productivity has been increasingly enhanced in recent decades. The problem of cleaning water in shrimp ponds greatly affects the quality as well as shrimp production. Environmental pollution of shrimp farming is a matter of concern because the current waste treatment solutions are not yet thorough. A waste remover of shrimp waste combined with the pond bottom siphon method has been researched and developed to increase the ability to thoroughly handle waste generated in the culture environment. This device helps to automate the manual cleaning of the pond bottom by farmers. The device performs operations to clean waste, suck, filter, and remove waste from the culture environment. This device is self-propelled or manually controlled and operates in all weather conditions. This article introduces the process of testing and evaluating the efficiency of waste extraction equipment in shrimp ponds. The device was tested at a super-intensive shrimp farm and evaluated for operational efficiency. The experimental model consists of a shrimp pond operating a waste suction device, a control pond, an automatic monitoring system of water quality parameters (DO, H2S, NH3, pH, and temperature). Experimental ponds operating waste disposal equipment, control ponds are manually cleaned, other farming conditions of the two ponds are similar. The impacts of waste on the shrimp culture environment are determined through analyzing the results of measuring water quality criteria in the pond, thereby assessing the efficiency of waste removal of the equipment. The measurement results show that water quality parameters reach a value within the threshold if operating a waste suction device once per day. The benefits of waste remover operate to help save the cost of labor to clean the pond bottom, protect workers' health.
Experimental study of circular inlets effect on the performances of Gas-Liquid Cylindrical Cyclone separators (GLCC)
Authors: Minh Kha Ho , Thanh Nam Nguyen , Tuyen Vo , Tan Ken Nguyen
Published: April 2020

The gas-liquid cylindrical cyclone (GLCC) separators is a fairly new technology for the oil and gas industry. The current GLCC separator, a potential alternative for the conventional one, was studied, developed, and patented by Chevron company and Tulsa University (USA). It is used for replacing the traditional separators that have been used over the last 100 years. In addition, it is significantly attracted to petroleum companies in recent years because of the effect of the oil world price. However, the behavior of phases in the instrument is very rapid, complex, and unsteady, which may cause the difficulty of enhancing the performance of the separation phases. The multiple recent research shows that the inlet geometry is probably the most critical element that influences directly to the performance of separation of phases. Though, so far, most of the studies of GLCC separator were limited with the one inlet model. The main target of the current study is to deeply understand the effect of different geometrical configurations of the circular inlet on performances of GLCC by the experimental method for two phases flow (gas-liquid). Two different inlet configurations are constructed, namely: One circular inlet and two symmetric circular inlets. As a result, we propose the use of two symmetric circular inlets to enhance separator efficiency because of their effects.
Experimental Study of Square Inlets Effect on the Performances of Gas–Liquid Cylindrical Cyclone Separators (GLCC)
Authors: Minh Kha Ho , Thanh Nam Nguyen , Tuyen Vo , Tan Ken Nguyen
Published: April 2020

In the gas-oil field, the gas-liquid cylindrical cyclone (GLCC) separator has potentially replaced the traditional separator that is used over the century. It is also interesting for petroleum companies in recent years because of the effect of the oil world price. However, the behavior of phases in the equipment is very rapid, complex, and unsteady, which may cause the difficulty of enhancing the performance of the separation phases. The much research demonstrates that the geometry and the number of the inlet is probably the most important factor that impacts directly to the performance of separation of phases of the device. The main goal of the research paper is to deeply understand the effect of different geometrical configurations of the square inlet on hydrodynamics and performances for two phases flow (air-water). Two different inlet configurations are constructed, namely: One square inlet with the gradually reduced nozzle and two symmetric square inlets with the gradually reduced nozzle. As a result, the separation efficiency of the device will be higher when using two symmetric inlets, and we suggest the application of two symmetric square inlets type that is the same angle of inclination and the area of the nozzle with the unique inlet configuration to improve separation efficiency in GLCC. Such an inlet structure leads to lower swirl intensity decay than one inlet configuration. It also creates a more axis-symmetric flow at the centerline, which would improve the uplift of air bubbles in the performance of GLCC. Besides, this study can be viewed as a padding step to optimizing the operative parameters of GLCC in further study.