Indonesia Conference Directory

Corresponding Author
Rezqi Malia

Institutions
Student Magister Civil Engineering of Syiah Kuala University

Abstract
Simpang Tujuh Ulee Kareng is one of intersection with high vehicle volume. The increase in V/C ratio every year starts from 2016, 2017, and 2018, each was 0.301, 0.316 and 0.322, but each was 21,909 vehicles, 20,950 vehicles, and 21,896 vehicles. The intersection will be calculated by using SIDRA Intersection, and then it will merger of intersection. In this case, it will change the route for flow rate. The calculate is in unsignalized and signalized. Furthermore, we will compare after estimate all of its. After estimating with this method, it has level of service for existing conditions which has seven road segments and the level of service after merger of intersections will be four road segments unsignalized or signalized. The results that will hope are the level of service and sensitivity.

Keywords
SIDRA Intersection, unsignalized, signalized, seven road segments, four road segments.

Topic
Civil Engineering

Link: https://ifory.id/abstract/2CjvzcDEpwRG

Corresponding Author
sri susilawati islam

Institutions
a) Industrial Engineering Program Study, Sampoerna University, Jl. Raya Pasar Minggu No.Kav. 16, Jakarta 12780, Indonesia
*sri.islam[at]sampoernauniversity.ac.id
b) Accounting Program Study, Sampoerna University, Jl. Raya Pasar Minggu No.Kav. 16, Jakarta 12780, Indonesia
c) Industrial Engineering Program Study, Borobudur University, Jl. Raya Kalimalang No.1, Jakarta 031018, Indonesia

Abstract
The research aims to examine factors that may cause inventory mismanagement in a Small Medium Enterprises (SME), which is a market leader in the Heavy Equipment after sales business, is selected. The company is selected because despite its status as market leader, the company deals with various inventory problems, for examples slow moving stocks, delivery delays to customers, etc. Those problems, at the end, may reduce companys profit. In order to determine the main causes, this study applies quantitative and qualitative methods. Quantitative method, specifically Pareto diagram and Inventory Turnover Ratio (ITR) is mainly used to evaluate sales and inventory management. ITR is affected by spare part quantity, warehouse area used, and the material amount. The top five ITR ratings are examined further through observation, interview, and questionnaire techniques. Meanwhile, the qualitative method is applied to evaluate the companys inventory information systems, procedures and coordinations among departments, and human resources. Our findings suggest that the unintegrated companys information system and lack of qualified human resources are the main factors affect inefficient inventory management. The research benefits to industry by suggesting the importance of information systems and human resources to inventory management. As for academics, this research enriches inventory management literature.

Keywords
Inventory Management, Small Medium Enterprise, Inventory Turnover Ratio

Topic
Industry Engineering

Link: https://ifory.id/abstract/JkVN2wr3acxt

Corresponding Author
jamilah jamilah

Institutions
Institut Pendidikan Indonesia Garut

Abstract
This study is inspired by the increasing number of smartphone users. There are three objectives of this study, such as: to reveal the smartphone utilization, to describe students freedom of speech on social media such as facebook, to discover the impact of smartphone utilization towards students freedom of speech on facebook. The study employed descriptive method with quantitative approach. As many as 100 students out of 10 study programs were selected randomly as the sample of this study. The results of the study revealed that: Smartphone utilization among university students was not only intended for learning activity but also for non-learning activity, students freedom of speech on facebook was considered as positive aspiration, and smartphone was significantly influential on how students freedom of speech was expressed on facebook. To conclude, smartphone is a media which can be utilized by the students to express their point of view on facebook. The implication towards the findings of the study is that the government as the policy maker is expected to control and enforce Electronic Information and Transactions Law (ITE Law), in order that the freedom of speech does not violate the applicable law.

Keywords
Smartphone, Freedom of Speech, Facebook

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/Bd7E8TyjWnaf

Corresponding Author
Wafa Maftuhin

Institutions
Faculty of Engineering and Technology, Sampoerna University, South Jakarta 12780, Indonesia

Abstract
We present a self-consistent charge density functional tight-binding (SCC-DFTB) parameterization for boron clusters. In the parameterization we devote more attention to the repulsive energy in the SCC-DFTB theory and examine the quality of the parameter fitted to different sets of reference structures. To test the quality of the parameter, we combine the SCC-DFTB with modified basin hopping method (MBH) to search for global minima of small boron clusters Bn (n=3-13). In closer examinations, we found the repulsive potential fitted to trimer is a compromise among the reference structures judging from the variation of the potential curve and the geometry that it yields. On comparing further our calculated lowest energy boron clusters are very good agreement with other theoretical calculations.

Keywords
Density Functional Tight Binding; Repulsive Potential; Boron Clusters

Topic
Physics

Link: https://ifory.id/abstract/ag4urGWHdXL2

Corresponding Author
Ratnaningsih Ratnaningsih

Institutions
Environmental Engineering Departement, Faculty of Landscape Architecture and Environmental Technology, Universitas Trisakti, Jakarta, Indonesia

Abstract
ratnaningsih@trisakti.ac.id Abstract. Cisauk Water Treatment Plant (WTP) is one of the water treatment plants operated by PDAM Tirta Kerta Raharja, Tangerang District, which supply drinking water for Cisauk and Suradita Subdistricts with a capacity of 50 L/sec. This research was conducted to evaluate the performance of each units on Cisauk WTP and compare the quality of water produced with the drinking water standard of PERMENKES No. 492 of 2010. Evaluation of WTP process is conducted by analyzing the quantity and quality of produced water, and then calculate of criteria design for each unit. The processing unit consists of intake, hydraulic coagulation, hydraulic flocculation, sedimentation I and II, filtration and ground reservoir. The coagulant used was NUSACHEM with dose of 35 mg/L and the disinfectant used was gas and liquid chlorine at dose of 3-5 mg/L. Based on the WTP evaluation, not all units fullfill the design criteria based on SNI 6774 of 2008. However, the quality of the water produced fulfill the drinking water quality requirements of PERMENKES No. 492 of 2010.

Keywords
Water Treatment Plant, Performance Evaluation, Design Criteria, Drinking Water

Topic
Environmental Engineering

Link: https://ifory.id/abstract/wyNUFvAhHX3x

Corresponding Author
Nanang Ismail

Institutions
UIN Sunan Gunung Djati Bandung

Abstract
An antenna is the most important part of wireless communication systems. Wifi has an omnidirectional radiation pattern that produces a limited beam range. Therefore, an external antenna with a higher gain is needed than an internal antenna. In this research, a rectangular Yagi microstrip antenna is designed with two levels of directors that can work on the 2.4 GHz frequency (Wifi Application). The selection of the relative permittivity of the dielectric material and setting the antenna dimensions is done carefully to obtain a gain> 5 dB. During the simulation, optimization is done by changing the dimensions of driven, director, reflector, and distance between levels. The simulation results show that the antenna has worked at a frequency of 2.4 GHz with a bandwidth of 209 MHz, a gain of 8,148 dB and a bidirectional radiation pattern. The antenna is realized using a dielectric material with a relative permittivity of 4.3. The antenna measurement results show a bandwidth of 210 MHz and a gain of 7.98 dB. By choosing the relative permittivity of material and carefulness in setting the dimensions of the antenna, it is proven to produce an antenna with gain as targeted, although the antenna only uses 1 branch and 2 levels of directors.

Keywords
Director; Gain; Rectangular Microstrip Yagi; Relative permittivity; Wifi

Topic
Electrical Engineering

Link: https://ifory.id/abstract/bmWvCEgH2nDA

Corresponding Author
izzil muhiqqin

Institutions
State Polytechnic Of Malang

Abstract
Sending secret message need an algorithm that can protect message to receiver without knowing by other and keep the originality of message. Previous research, encoding secret message in video inserted in frame while audio secret message inserted in bit audio. In this paper, try to encode the secret message at video file to encode in audio. Audio separated from video in order to encode secret message in audio. Echo Hiding method used in encode secret message to audio process. Testing use Bit Error Rate (BER) method to analysis modification in audio and Normalized Correlation (NC) analysis authentic the secret message. Based on experiment, message inserted in audio more authentic on mono audio channels than stereo audio channels.

Keywords
echo hiding,secret message,sending message

Topic
Computer Science

Link: https://ifory.id/abstract/JKZfhjQvxCWk

Corresponding Author
Setia Muljanto Sumantri

Institutions
English Department, Institut Pendidikan Indonesia
Information Technology, Institut Pendidikan Indonesia
Institut Pendidikan Indonesia

Abstract
In the times of digital era, students of higher education are still uncertain about their future plan. With the rapid flow current of technology advancement, students of Indonesia Institute of Education (IPI) are hesitating on deciding to become one profesional teacher or to do a business. Those are the choices that have to be made. Therefore, besides teaching skills, the duty of IPI is also to make an introductory course for their students on entrepreneurial skills. The purpose of this research is to identify students interest in start up business through the introduction of internet and web awareness. Data were gathered by using online and distributed to 117 students in the form of questionnaire and open ended questions.The result of this research showed that by introducing internet and web functions for the business, the students have profound interest to make their own business. The impact of this study was to suggest the government to create a policy for supporting these new emerging start up and the head of higher education to include internet and web literacy into their curriculum.

Keywords
Internet literacy, web literacy, start up business

Topic
Management Science

Link: https://ifory.id/abstract/aLn3Kx9N6ceQ

Corresponding Author
Anita Susanti

Institutions
Civil Enginering, Institut Teknologi Sepuluh Nopember Surabaya, Surabaya, 60111, Indonesia

Abstract
The existence of a stretch of the Commuter Train Service in The City is very limited. The limitations of The Commuter Train Service, require Operational Planning for Commuter Train Service in Underserved Area. Areas that have not been served by public transportation are Areas Outside The Area of Influence. The influence area is the area where the Commuter Train Passenger feels comfortable by walking or using other modes when heading and leaving the train station. Urban mass transit planning requires data about the area of influence in terms of the use of modes used. These data include travel behaviour characteristics consisting of networks and modes used to go or leave the station. This study aims to obtain data to predict the area of influence of Access and Egress of commuter line Surabaya-Lamongan based on the travel behaviour characteristics survey. The interview survey was conducted on 311 SULAM Commuter Train Passengers and analyzed using the Chi Square Statistical Test. The results of the research can be stated that the area of influence for commuter Access and Egress is 3 Km. The benefits of the research results can be used as a New Pathway for Commuter Train Services in Unserved Area.

Keywords
Prediction, Area of Influence, Access, Egress, Commuter Train Prediction, Area of Influence, Access, Egress, Commuter Train Prediction, Area of Influence, Access, Egress, Commuter Train Prediction, Area of Influence, Access, Egress, Commuter Train

Topic
Civil Engineering

Link: https://ifory.id/abstract/dqaHxbhmBZQj

Corresponding Author
Sri Mulyati

Institutions
(a) Graduate School of Chemical Engineering, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia
(b) Doctoral School of Engineering Science, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia
(c) Department of Chemical Engineering, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia
*sri.mulyati[at]unsyiah.ac.id

Abstract
This works focuses on the fouling resistance evaluation of polydopamine-blended poly (ether sulfone) (PES) ultrafiltration membrane for water treatment application. The supporting PES membrane was prepared via common phase inversion method. The dopamine was introduced to the membrane by blending technique and the modification occurred by in-situ polymerization of dopamine into polydopamine which triggered by peroxide. The antifouling performances were studied in terms of flux recovery, reversible fouling, irreversible fouling, and total fouling. The relevant characteristics of the membranes such as surface porosity, chemical composition, water permeation, and solute rejection were also provided to support the analysis of antifouling performances. The results revealed that the presence of polydopamine in the membrane system significantly enhanced the fouling resistance of the polydopamine-blended PES membrane. The hydrophilic component in polydopamine reduced the interaction of membrane with foulant thus lowered the total fouling of only 18.92% with 13.50% reversible fouling and 5.42% irreversible fouling for modified membrane. In addition, the polydopamine-modified membrane successfully recovered up to 95% of the flux after backwashing, much higher than that of original PES which was only 67%.

Keywords
Antifouling; Ultrafiltration; Polydopamine; In-situ polymerization

Topic
Chemical Engineering

Link: https://ifory.id/abstract/6peDGCxfYKEZ

Corresponding Author
Sri Mulyati

Institutions
(a) Department of Chemical Engineering, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia
(b) Doctoral School of Engineering Science, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia
*sri.mulyati[at]unsyiah.ac.id

Abstract
This paper reports about the application of biosilica sourced from low-cost and natural biomasses such as rice husk and sugarcane bagasse as membrane modifying agents. The modification was conducted on poly(ether sulfone) membrane by blending technique. The modification was aimed to improve the performance of the PES membrane in terms of water permeability as well as separation performance. The effects of silica addition to the membrane system were evaluated through the analysis of change in chemical structure using attenuated total reflectance-fourier transform infrared spectroscopy, surface morphological change using the atomic force microscope, and surface hydrophilicity using water contact angle measurement. The results showed that addition of biosilica of both natural sources successfully enhanced the pore property and hydrophilicity (from 80 to 50 contact angle degree) of the membranes which subsequently improved the water permeability as well as filtration performance of the blended membranes.

Keywords
Biosilica; Ultrafiltration; Flux promoting agent; Rice husk; Sugarcane baggase

Topic
Chemical Engineering

Link: https://ifory.id/abstract/uED7FUCqWkvA

Corresponding Author
Ali Ismail

Institutions
1Department of physics education, Institut Pendidikan Indonesia, Jl. Pahlawan No.32, Garut 44151, Indonesia
2Institut Pendidikan Indonesia, Jl. Pahlawan No.32, Garut 44151, Indonesia
3Department of english education, Institut Pendidikan Indonesia, Jl. Pahlawan No.32, Garut 44151, Indonesia

Abstract
Physics concepts are unique because some of them are the abstract concepts so they need to be visualized so as easier to be understood. However, it is rarely the learning media that can combine the real and virtual visualization of abstract physics concepts in the same time. This present study aims to create the application that is used as the physics learning media to aid the virtual visualization of the abstract concept of physics combined with real visualization using augmented reality. The abstract concepts of physics that are visualized are electricity concepts. The waterfall method is the method utilized to test the application on the android system. There are four standards to analyze data, namely functional suitability, performance efficiency, portability, and usability&

Keywords
augmented reality, physics, electricity

Topic
Computer Science

Link: https://ifory.id/abstract/TQfz6He8MG2n

Corresponding Author
Firda Tirta Yani

Institutions
(a) Graduate School of Chemical Engineering, Universitas Syiah Kuala, Banda Aceh, Indonesia, 23111
(b) Department of Chemical Engineering, Universitas Syiah Kuala, Banda Aceh, Indonesia, 23111
*husni_husin[at]che.unsyiah.ac.id

Abstract
With the aim to reduce the negative impacts caused by the widespread of water hyacinth to the environment, this paper reports the utilization of water hyacinth as a source of biomass to fabricate a heterogeneous catalyst. The catalyst was prepared by calcinating the grounded hyacinth biomass at 600 celcius, and K2CO3 was then introduced as a co-catalyst through impregnation method. The properties of biodiesel were also evaluated in terms of viscosity, density, and acidic number. To better understand the impregnation effects, surface topography, particle size, and atom composition of water hyacinth catalyst without and with K2CO3 impregnation were analyzed. The performance of the synthesized catalyst was studied for transesterification reaction of palm oil into biodiesel. The reaction was carried out in a batch mode for 3 hours with stirring at 65 celcius. The molar ratio of methanol to oil of 12:1, and the catalyst loading was varied from 5 to 15 wt.%. The highest yield (94,47%) was obtained from the process using 15% of hyacinth-based catalyst which impregnated with 20% of K2CO3. The biodiesel produced was in the range of the SNI standard. The water hyacinth can be a promising heterogeneous catalyst for biodiesel production at industrial scale.

Keywords
Heterogenous catalyst, Water hyacinth, Impregnation, Biodiesel

Topic
Chemical Engineering

Link: https://ifory.id/abstract/rZ2UWPC4Fvyd

Corresponding Author
Rizqi Darma Rusdiyan Yusron

Institutions
State Polytechnic of Malang

Abstract
Algorithms developed to identify people with iris image data have been tested in many field and laboratory experiment. This paper makes a parameter analysis of iris image used to recognize human. Iris recognition system, which is applied based on segmentation, normalization, encoding, and matching is also describe in this paper. Circle Hough Transform the segmentation module used to find the inner and outer boundaries of the iris. The experiment was carried out using CASIA v1 iris database with grayscale images. Shape, intensity, and location information for localizing the pupil or iris and normalizing the iris area a used iris segmentation the by unwrapping the circular area into a rectangular area. Normalized area will be used to extract the features using Gray Level Co-occurrence Matrix (GLCM) and Gabor filter, the feature compared the recognition accuracy using Support Vector Machines (SVM) and Naive Bayes classifiers. GLCM feature test results achieved 95.24% SVM classification accuracy, where as using achieved 85.71% Naive Bayes. Gabor feature test results achieved 95.24% SVM classification accuracy, where as using achieved 95.23% Naive Bayes. The classification process based on GLCM and Gabor features show that the SVM method have to highest recognition accuracy compare to Naive Bayes classifier.

Keywords
Gray Level Co-occurrence Matrix; Gabor Kernel Filter; Iris Feature; Feature Extraction

Topic
Computer Science

Link: https://ifory.id/abstract/njQUMrgphTHe

Corresponding Author
Yuliana Sy

Institutions
1) Graduate School of Chemical Engineering, Universitas Syiah Kuala, Banda Aceh, Indonesia, 23111

2) Department of Chemical Engineering, Universitas Syiah Kuala, Banda Aceh, Indonesia, 23111

Abstract
This study reports on the development, preparation and performance test of NbOPO4 solid acid catalyst for biofuel production from vegetable oil. NbOPO4 catalyst was synthesized by sol-gel method using NbCl5, H2SO4, and citric acid as the precursor solutions and chellating agent, respectively. This solid acid catalyst was developed by combination with NaOH as an active phase to provide reaction sites and increase the surface area of the catalyst. Dependent variables in the study were calcination time of 5 h; NbOPO4 loading of 2%; transestrification time of 3 h; reaction temperature at 65-70 Celcius and oil mass of 30 g. Whereas, the catalyst pH of 2, 4, 6, 9, and Na impregnation ratio of 20-50% were set as independent variables. The crystalline morphology of catalyst was analyzed by Scanning Electron Microscopy, and X-Ray Difractometer was used to characterize crystallinity degree of the catalyst. The performance of the catalyst was evaluated from a transesterification reaction for biodiesel production. The highest biodiesel yield of 98,5% was obtained in the reaction using catalyst with pH of 4 and Na impregnation ratio of 30%. The density obtained was 0,860 gr/cm3 confirming that the produced biodiesel complies to the SNI standard.

Keywords
solid acid catalyst, biofuel, transesterification, Na/NbOPO4

Topic
Chemical Engineering

Link: https://ifory.id/abstract/eJtFNmEYXzPL

Corresponding Author
Agus Sanjaya

Institutions
Department of Industrial Engineering, Universitas Prima Indonesia, Jl. Sekip Simp. Sikambing, Medan, Indonesia

Abstract
Strategic distribution locations and optimal distribution routes are important concerns of a company to minimize distribution costs. The shorter the distribution route, the lower the cost of distribution. Animal feed companies have difficulty in reducing distribution costs. Therefore, research is conducted to determine the exact location of the distribution center so that the distribution route is optimal. The purpose of this research is to determine the optimal distribution center location to reduce distribution costs. In determining the proposed distribution center location, Gravity Location Model is used. The research results are the new coordinates as the proposed distribution center location, namely (98.888504; 3.419406) and the total distribution cost of initial distribution center location is Rp 7.135.828, while the total distribution cost of proposed distribution center location is Rp.6.965.143. The results obtained show that the total distribution costs can be reduced by 2.39% per day.

Keywords
Route optimization, Saving matrix, VRP, Gravity location model

Topic
Industry Engineering

Link: https://ifory.id/abstract/RYfZ7yV8ptcQ

Corresponding Author
tir mayasari

Institutions
University of Mataram

Abstract
The purpose of this research was to develop learning materials of natural science of characters-based problem on light and optical concept in junior high school Four East Praya. Method of the research is descriptive, evaluative, and experimental. Research and development study refering to Dick & Carey design namely: identify instructional goal, conduct instructional analysis, analyze learner and contexts, write performance objektives, develop assessment, develop intrucsional strategy, develop and select instructional material, design and conduct formative evaluation of instruction, revise instruction, design and conduct summative evaluation. The formative evaluation stage was done by: the validation of the learning materials by three experts, the limited trials on the learning materials of natural science and teaching tools (syllabus, lesson plan, and students worksheets) held in eighth grade, and validity and reliability test instruments (critical thinking skill tests, scientific attitude, and character questionnaire) held in ninth grade. The expert test results showed that learning materials of natural science were feasible, teaching tools very feasible for use in limited trials. In conclusion, learning materials of natural science of characters-based problem on light and optical concept was feasible to be applied in science learning processes.

Keywords
learning materials of natural science, problem-based, and character

Topic
Physics

Link: https://ifory.id/abstract/upCT3MVRFBh4

Corresponding Author
Willyanto S

Institutions
Department of Industrial Engineering, Universitas Prima Indonesia, Jl. Sekip Simp. Sikambing, Medan, Indonesia

Abstract
The right inventory of raw materials will minimize optimal inventory costs. A company that produces bottled beverages in Medan has problems in procuring raw materials, especially sugar, which results in high inventory costs. Therefore, this study will calculate the order of requests using the Economic Order Quantity (EOQ), Period Quantity Order (POQ). ) and MIN MAX. The EOQ method was chosen because it saves storage costs and ordering costs. The data analysis technique in EOQ method is calculating the optimal amount of raw material purchases, the optimal ordering frequency, the message costs, optimal cost savings and total cost of raw material inventory. EOQ method turned out to have a lower total inventory cost compared to the cost of procurement of raw material supplies set by the company, which is Rp. 215,862,536 while the EOQ method is Rp. 210,777,546. From the calculation results, the EOQ method is more efficient, because the company will be able to minimize the total inventory cost of Rp. 5,084,990 or 2,4% lower.

Keywords
Raw material inventory, EOQ, POQ, MIN MAX

Topic
Industry Engineering

Link: https://ifory.id/abstract/4YKfetwVLcr6

Corresponding Author
Syariful Maliki

Institutions
(a)Graduate School of Chemical Engineering, Universitas Syiah Kuala, Banda Aceh, Indonesia, 23111
(b)Department of Chemical Engineering, Universitas Syiah Kuala, Banda Aceh, Indonesia, 23111
*cutnelly[at]ymail.com

Abstract
Ferrous is one of the groundwater contaminants that negatively impacts health and the environment. The allowed ferrous content is < 1 ppm in water for daily use. Removal of Fe in groundwater by adsorption using low-cost bio-sorbent from rice husk has been conducted. The process was carried out in continuous mode using two types of rice husk-sourced adsorbents, one was only carbonated at 400 C and another was followed by a physical activation at 650 C. To study the effects of physical activation on the surface characteristics, both types of bio-sorbents were characterized by Scanning Electron Microscope and Fourier-transform infrared spectroscopy. The concentration of artificial sample before and after adsorption was evaluated using the Atomic Absorption Spectroscopy. From the results, the adsorption using physically activated sorbent had greater removal efficiency of 74.02% compared to that of without activation treatment, which was only 65.70%. In addition, the concentration of ferrous was successfully reduced to 1,029 and 0.779 ppm from the initial concentration of 3 ppm for the process using the adsorbent without and with activation, respectively. It can be concluded that the physically activated rice husk has the potential to be used for adsorption of Ferrous in continuous reactor.

Keywords
Biosorbent; Rice husk; Fe removal; Continuous adsorption

Topic
Chemical Engineering

Link: https://ifory.id/abstract/9JdUxhKvzAVw

Corresponding Author
Asep Rohayat

Institutions
Biology Department, Institut Pendidikan Indonesia

Abstract
Abstract Additives are chemical compounds added to preserve food. There are two types of additives; natural and artificial additives. The durability of wet noodles is relatively lower compared to other staple food. There are various methods to preserve wet noodles. One of which is the addition of natural additives. Natural additives are chosen because they are safer than artificial additives which are more precarious to human health. The natural additives used are carrots because they contain B-carotene compounds functioning as antioxidants that reduce and or deactivate free radical attacks and ROS (Reactive Oxygen Species) on food caused by microorganisms. These processes increase the durability of wet noodles. The research aimed to determine the effect of B-carotene content in carrots as a natural additive for wet noodle preservation. The method used was an experiment with B-carotene concentration variations in carrots; 0%, 20%, 40%, 60%, and 80%. From the results, it was found that at the 60% concentration of B-carotene, the durability of wet noodles reached the maximum 4 day. This fact showed that the addition of high concentration B-carotene will affect the durability of wet noodles. And carrots can be used as natural additives in preserving wet noodles.

Keywords
B-carotene, Additives, durability, wet noodles

Topic
Biology

Link: https://ifory.id/abstract/HtJAbXUKfkv6

Corresponding Author
M. Haris Satria

Institutions
Universitas Bina Darma, Jl. Jend. Ahmad Yani No.3, Palembang 30264, Indonesia

Abstract
This research focused on 1) developing a teaching model for fundamental motor skills based on games for children with moderate mental disabilities and 2) obtaining empirical data about the effectiveness of the results of this model. This is a research and development project. The sample for this research consisted of children with moderate mental disabilities in SD SLBC Karya Ibu, SD SLBC YPAC, and SD SLBB Pembina. The results of this study showed that there were 88 basic motor skill variants that need to be taught. The results of the small group test and the large scale tests of this model showed the product produced can already be applied by children with moderate mental disabilities, however, they still need guidance. Finally, effectiveness tests showed that there was significant improvement in motor skill abilities (locomotive, non-locomotive, and manipulative). Based on this research, it is evident that this product can be fruitfully used as a method to increase fundamental motor skills ability in children with moderate mental disabilities.

Keywords
fundamental motor skills, moderate mental disabilities

Topic
Sport Science and Technology

Link: https://ifory.id/abstract/qrwjQG3J4cWD

Corresponding Author
ni putu diah witari

Institutions
a) Faculty of Medicine and Health Sciences, University of Warmadewa, Denpasar, Bali
*diahwitari[at]gmail.com
b) Tabanan General Hospital, Bali

Abstract
Indonesia as one of the tropical countries has a high prevalence of dengue. Pathophysiology of dengue fever is through the role of the immune system, one of which is the role of cytokines. Interleukin 8 (IL8) is one of the pro-inflammatory cytokines produced by macrophage cells in the immune response. Several studies have linked interleukin 8 levels with dengue infection. The purpose of this study was to determine interleukin 8 levels in patients with dengue fever. The research design used was a cross-sectional study. Serum samples of 50 samples were collected and then examined for interleukin 8 levels using the ELISA method. The results of this study, more research subjects diagnosed with dengue fever as much as 90% (45 samples) and 10% (5 samples) dengue hemorrhagic fever. Through the Mann-Whitney test analysis, IL8 levels are expressed in the median (minimum-maximum). Levels of IL8 in dengue fever 19.76 (13,70-89,62) and 25,15 (15,74-25,87) in dengue hemorrhagic fever. The conclusion is that interleukin 8 levels were not statistically different between patients with dengue fever and dengue hemorrhagic fever.

Keywords
Interleukin 8, dengue fever, dengue hemorrhagic fever.

Topic
Biology

Link: https://ifory.id/abstract/CjHYU7b94zGh

Corresponding Author
Komang Trisna Sumadewi

Institutions
a) Faculty of Medicine and Health Science, Warmadewa University
Jalan Terompong no 24, Denpasar 80235, Indonesia
*drtriscel[at]gmail.com

Abstract
Flat foot or also known as pes planus is a condition in which the inner or medial arches are reduced or absent so that the sole of the foot will touch the ground. This situation can be physiological which is called a flexible flat foot or pathological which is called a rigid flat foot. Flat foot is one of the most common conditions encountered by pediatrics, which affects around 20% to 30% of the worlds population. With increasing age, the prevalence of flat foot will decrease. Flat foot causes foot instability as a bodybuilder. This study aims to look at the relationship between Body Mass Index (BMI) and the incidence of flat foot in grade 1 and 2 children at SD 5 Sumerta, Denpasar. This study is an analytical study using a cross-sectional approach with a sample of 40 conducted at SD 5 Sumerta Denpasar. The data obtained was carried out a descriptive analysis and correlation test. From this study, it was found that BMI had a correlation with Flat foot (p=0.001; r=0.695). Confidence Interval (CI) 95%. In conclusion, the Body Mass Index has a significant positive correlation with flat foot prevalence.

Keywords
Flat Foot, Body Mass Index, Elementary School Students

Topic
Biology

Link: https://ifory.id/abstract/gNGkB4vX7ra6

Corresponding Author
Muhamat Maariful Huda

Institutions
State Polytechnic of Malang

Abstract
In foreign exchange money trading, historical data are publicly available continuously. This historical data such as opening, highest, lowest, and closing rate are important variable to predict the future of rates movement. The available data is not only historical trading itself, but also from news release and expert analysis from expert trader. This kind of data contains text and number. This paper proposes in forecasting the rates by combining text and number data. The combination of text mining technique with several time series method i.e: simple moving average, weighted moving average and exponential moving average. Research period for this experiment is between 1st December 2018 and 31st January 2019. The currency pair are EURUSD, USDJPY and EURJPY. Forecasting results with some time series method were compared with combined time series forecasting method and naive bayes classifier. The experiment results show that combined time series method with naive bayes classifier delivered better accuracy level.

Keywords

Topic
Computer Science

Link: https://ifory.id/abstract/3xLKdTuZeyWm

Corresponding Author
ni putu diah witari

Institutions
a) Faculty of Medicine and Health Sciences, University of Warmadewa, Denpasar, Bali
*)diahwitari[at]gmail.com

Abstract
Escherichia coli is a Gram-negative bacterium that has a natural habitat in the human digestive tract. This bacterium besides being a normal flora can also be pathogenic. Escherichia coli is the most common cause of diarrhea. Guava leaves and bay leaves contain essential oils, tannins, flavonoids, and saponins which have antimicrobial effects. The purpose of this study was to determine the difference in the effectiveness of inhibition between ethanol extract of guava leaves and bay leaves on the growth of Escherichia coli bacteria. This type of research is an experimental laboratory. The inhibitory test was carried out by measuring the clear zone around the paper disc using callipers. The results of data analysis using one way ANOVA showed that there were significant differences between groups of extracts with F output = 49.83 and p = 0.00 (p&

Keywords
Escherichia coli, guava leaves, bay leaves

Topic
Biology

Link: https://ifory.id/abstract/W4THYdjRQc93

Corresponding Author
Farid Perdana

Institutions
1. Program Studi Farmasi, Fakultas Matematika dan Ilmu Pengetahuan Alam Univesitas Garut Jl. Jati No. 42 B Tarogong Garut, Jawa Barat
*farid[at]uniga.ac.id

Abstract
Compounds in plants can inhibit or even kill cancer cells so that they have the potential as anticancer agents. One of the potential plants as an anticancer agent is the annonaceae family. This reserch as a screening method using Brine Shrimp Lethality Test is to find out the cytotoxic activity of soursop leaves, srikaya leaves, and nona leaves. The result of the preliminary test of cytotoxic activity of ethanol extract of soursop (Annona muricata L), srikaya (Annona squamosa L) and nona (Annona reticulata L)leaves showed cytotoxic activity wilth LC50, respectively 30,90; 38,01; dan 46,77 ppm. Based on the results of the study all extracts have cytotoxic activity. The highest cytotoxic value was shown by soursop leaf ethanol extract with LC50 value of 30,90 ppm.

Keywords
BSLT, Annonaceae Family, Cytotoxic

Topic
Biology

Link: https://ifory.id/abstract/YfqgtGUW6KBD

Corresponding Author
bayu hardiyono

Institutions
Universitas Bina Darma

Abstract
This research is a descriptive study which aims to determine the level of anxiety and confidence in south sumatra rock climbing athletes before the competition and during a the competition. The sample of this research amounting to 30 regional elite athletes. This research method is survey with a questionnaire as an instrument for data retrieval. The data analysis used descriptive analysis techniques with percentages. The results of the research that indicate, on intrinsic and extrinsic factors, for the results of anxiety analysis intrinsic factors in the low category of 21.94%, this means anxiety rock climbing athletes before facing matches are influenced by intrinsic factors. while for the results of the analysis of anxiety extrinsic factors in the high category 78.06%, this means that the anxiety of rock climbing athletes before facing the match is strongly influenced by extrinsic factors. While the results for the results of the analysis of confidence

Keywords
anxiety, confidence,rock climbing

Topic
Sport Science and Technology

Link: https://ifory.id/abstract/bQP6evfuKLXR

Corresponding Author
Mimi Nur Hajizah

Institutions
Universitas Negeri Jakarta

Abstract
This research aims to develop a didactical design of learning about circle at junior high school, especially the relationship between central angle, length of arc, and area of segment of the circle. Developed didactical design consists of three activities obtained from three formal stages during the research process. The first stage is the analysis of the didactical situation before learning to obtain a hypothetical didactical design. Preparation of hypothetical didactical design is preceded by a preliminary study which includes the identification of obstacles student learning as well as the theoretical analysis and repersonalisasi. Identification of learning obstacle is conducted at a junior high school in South Jakarta involving 34 students of class IX by analyzing the results of the students answers on the questions provided, analyzing the results of interviews of teachers and students, as well as analyzing the textbooks used at the schools. The second stage is the analysis metapedadidaktic which is reflected in the design implementation. Design implementation is conducted at junior high school where a preliminary study done involving 36 students of class VIII. The third stage is the stage of reflection by conducting a retrospective analysis. This is done in order to obtain information for a revised design to produce empirical didactical design. The developed empirical didactical design allows for further development through the three stages of the same formal.

Keywords
didactical design; mathematics; learning obstacle; circle

Topic
Mathematics

Link: https://ifory.id/abstract/kQdexBfrAL76

Corresponding Author
Komang Trisna Sumadewi

Institutions
a) Faculty of Medicine and Health Science, Warmadewa University
Jalan Terompong no 24, Denpasar 80235, Indonesia
*drtriscel[at]gmail.com

Abstract
Obesity is one of the greatest factors causing health problems. Many studies have shown a significant association between obesity and lung disorders in the form of obstructive sleep apnea (OSA) and asthma. The purpose of this study is to know the ratio of lung function before and after exercise in the normal and obesity group. The research design used was quasi experimental with pretest and posttest design, using Pearson ChiSquare hypothesis test, Wilcoxon Sign Rank Test and Mann Whitney U Test. There are 60 samples divided into normal and obese with an average age of 19.47, consisting of men and women in each of 30 people. The result of this research is in the normal group average of delta value of FEV1 equal to 0,13, FVC equal to 0,10, and lung function equal to 0,87. While in the obese group the mean value of delta FEV1 is -0.17, FVC of 0.00, and lung function of -4.92. The conclusion of this study is the change of lung function between normal and obese group showed a significant difference, that is an increase in the normal group, but in the obese group actually decreased.

Keywords
Obesity, Lung Function, Exercise Induced Bronchospasm (EIB), exercise

Topic
Biology

Link: https://ifory.id/abstract/qYDGjnm42Mkt

Corresponding Author
Lina Siti Nurwahidah

Institutions
Institut Pendidikan Indonesia Garut

Abstract
Mobile learning is a technological innovation that makes teaching material accessible at any time with more interesting visualization. The use of interactive learning media has progressively contributed to the information delivery process development. This study aims to describe the contribution of mobile learning in improving the understanding of news item text generic structure. The increased understanding of the text was identified through analyzing and classifying respondents understanding of the main events, the context of the event, and the sources of information enclosed in a news item text. The results of the study showed that the use of mobile learning is so effective in conveying information that it can increase respondents understanding in identifying the generic structure of the news item texts. In the digital era, mobile learning can be used as a medium to deliver information both formally and non-formally.

Keywords
Mobile Learning, Generic Structure, News Item Text

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/BXw9Fkn6quRK