bluuebunny/crossref_metadata_2025 huggingface dataset:
QUALITY MANAGEMENT OF THE EDUCATIONAL PROCESS ON THE BASIS OF THE ANALYSIS OF TEST TASKS BY USING ARTIFICIAL INTELLIGENCE
Authors: Dobritsa V. P. , Goryushkin E. I.
Published: March 2019

Introduction. The use of information and communication technologies allows the teacher to update the content of training. The success of the educational process is largely determined by the ICT competence and ICT literacy of the teacher. Data mining based on artificial neural networks can be used as one of the elements of information and communication technologies. The main direction of application of tests is to measure the level of knowledge of students. A large amount of accumulated test results with proper processing can provide the teacher with additional (hidden) data. The use of an artificial neural network for the analysis of test results makes it possible to expand the direction of the tests. Methods. The theoretical basis of the study is based on a complex of scientific statements of domestic and foreign scientists in the field of education and artificial intelligence. Practical research methods are based on an experiment in creating a test in computer science, testing students and accumulating data, as well as their processing simulated artificial neural network. Results. The article describes the process of analyzing the results of research using the SPSS STATISTICA 20 programs. The search for hidden patterns of the test was carried out, the reliability of the results obtained was verified. Discussion. There was suggested the possibility of further application of the results obtained in the educational process. The results obtained can be used to search for and correct difficult or easy test items, and to replace failed test tasks. The teacher has the opportunity to redistribute the time resource for the study of difficult digestible topics, due to easily digestible. The idea of an integrated approach to the use of artificial neural networks in education is proposed.
RESEARCH OF CORROSION RESISTANCE OF COATINGS OBTAINED BY THE METHOD OF GAS DYNAMIC SPUTTER
Authors: Ageeva E. V. , Novikov E. P. , Osminina A. S.
Published: March 2019

Currently, almost all automotive vehicles use parts made of aluminum alloys. The world auto industry consumes from 4.5 to 5.0 million tons of aluminum alloys per year, which is about 20% of world aluminum production. Low density, high mechanical strength, corrosion resistance, good machinability and a number of other properties caused the use of aluminum alloys for the manufacture of critical parts of the internal combustion engine, as well as the use of aluminum powder materials in restoring defective automotive parts. The purpose of this work was to study the corrosion resistance of coatings obtained by the method of gas dynamic spraying using standard and electroerosive powder materials. Currently, one of the most promising methods for applying coatings is gas dynamic spraying. One of the problems of using the technology of gas-dynamic spraying is the quality of the used powder materials. One of the most promising and industrially not used are powder materials (PM), obtained from conductive waste by electroerosion dispersion. However, these materials have not been used to date in the technology of restoring defective parts of cars by gas-dynamic spraying, including the cylinder heads. Testing the corrosion resistance of gas-dynamic coatings was carried out according to the method of accelerated testing using the multichannel potentiostat-galvanostat “Elins P-20X8”. Potentsiostat - galvanostat R- 20X8 is entered  in the State Register of Measuring Instruments of the Russian Federation (State Register of SI of the Russian Federation) under registration number 70702-18. The method of calibration MP 206.1-001-2018, the verification interval is 2 years. The device is also certified according to the GOST R certification system. Certificate of Conformity No. ROSS RU.AD44.N04368. As a result of the study of the corrosion resistance of coatings, it was experimentally established that in coatings obtained using standard PM, the electrolyte penetrates the coating, respectively, the coating obtained using EDM PM is more resistant to corrosion and less susceptible to flaking.
Characterization of depression in Spanish tweets: a behavioral and linguistic analysis (Preprint)
Authors: Leis Angela , Ronzano Francesco , Mayer Miguel A. , Furlong Laura I. , Sanz Ferran
Published: March 2019

BACKGROUND

Mental disorders have become a major concern in public health and are one of the main causes of the overall disease burden worldwide. Social media platforms allow us to observe the activities, thoughts and feelings of people’s daily lives, including those of patients suffering from mental disorders. There are studies that have analyzed the influence of mental disorders, including depression, in the behavior of social media users, but they have been usually focused on messages written in English.

OBJECTIVE

The aim of this study is to identify the linguistic features of tweets in Spanish and the behavioral patterns of Twitter users that generate them, which could suggest signs of depression.

METHODS

This study was developed in two steps. In the first step, the selection of users and the compilation of tweets were performed. Three datasets of tweets were created, a depressive users dataset (made up of the timeline of 90 users who explicitly mention that they suffer from depression), a depressive tweets dataset (a manually curated selection of tweets from the previous users that include expressions indicative of depression) and a control dataset (made up of the timeline of 450 randomly selected users). In the second step, the comparison and analysis of the three datasets of tweets were carried out.

RESULTS

In comparison to the control dataset, the depressive users are less active in posting tweets, doing it more frequently between 23:00 and 6:00 (P<.001). The percentage of nouns used by the control dataset almost doubles that of the depressive users (P<.001). By contrast, the use of verbs is more common in the depressive users dataset (P<.001). The first-person singular pronoun was by far the most used in the depressive users dataset (80%) and the first and the second person plural were the less frequent (0.4% in both cases), being this distribution different to that of the control dataset (P<.001). Sadness and anger emotions were the most common in the depressive users and depressive tweets datasets with significant differences when comparing these datasets with the control one (P<.001). As for negation words, they were detected in the 34% and 46% of the tweets in the depressive users and depressive tweets respectively, which are significantly different to the control dataset (P<.001). Negative polarity was more frequent in the depressive users (54%) and depressive tweets (65%) datasets than in the control one (43.5%) (P<.001).

CONCLUSIONS

Twitter users who are potentially suffering from depression modify the general characteristics of their language and the way they interact on social media. Based on these changes these users can be monitored and supported, thus introducing new opportunities for the study of depression and for providing additional healthcare services to people with this disorder.
Asupan makan, status gizi, dan kualitas hidup pasien kanker payudara di RSUP DR Sardjito Yogyakarta
Authors: Susetyowati Susetyowati , Pangastuti Retno , Dwidanarti Sri Retna , Wulandari Hanifah
Published: March 2019

Background: Breast cancer is the fifth leading cause of death due to all the type of cancer and the second leading cause of death in developing country after lung cancer. The global incidents of this disease were 43%. The cancer cells have an ability to disturb the nutrients absorbtion in the body and give an effect of decreasing nutritional status, physical performance and quality of life.Objective: To show the relationship between nutrient intake, nutritional status and quality of life, breast cancer patients with radiotherapy at RSUP Dr Sardjito Yogyakarta.Method: This study was an observational study with cross sectional design. Total subject of this study were 85 respondents. Intake of energy, protein, fat and carbohydrate were measured using 1x24 hours food recall. Nutritional status were measured using patient-generated subjective global assessment (PG-SGA) questionnaire. Then the quality of life were measured using European Organization for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC QLQ-C30) questionnaire.Results: There were significant difference in the average intake of energy (p=0.013), protein (p=0.043) and fat (p=0.016) between severe malnourished, moderate malnourished and wellnourished patients, whereas the average intake of carbohydrate was not significant (p=0.070). The lower nutrition intake, the lower nutritional status. There was also significant difference in fat intake (p=0.035) and nutritional status based on PG-SGA (p=0.002) between patients with poor and good quality of life. Patients with poor quality of life had lower nutrition intake and nutritional status.Conclusion: Nutrient intake gave an effect to nutritional status and quality of life in breast cancer patient with radiotherapy.
Latihan yoga terhadap berat badan, persen lemak tubuh, dan lingkar perut pada wanita dewasa overweight
Authors: Fatimah Putri Nur , Dieny Fillah Fithra , Murbawani Etisa Adi , Tsani Ahmed Fahmy Arif
Published: March 2019

Background: Obesity caused diabetes and cardiovascular disease. Yoga considered three aspects, physic, emotion and mental that helped in obesity therapy.Objective: This research aimed to explain the influence of yoga excercise on body weight, percent of body fat, waist circumference and waist to hip ratio (WHR) in overweight women.Method: This research applied quasi experiment design by using pre-post test with control group design. The subjects of research were 31 women aged 19-25 years old and divided into 2 groups, treatment group and control group. Treatment group was prepared to do yoga in 60 minutes for 10 times during 20 days and given nutrition education, whereas control group was given nutrition education only. Data body weight and percentage of body fat were measured by bioimpedance analysis; waist circumference and WHR were measured by tape measures; food intake were assessed by food recall and food frequency questionnaire. Data were analyzed using paired t-test and independent t-test.Results: There was a significant difference of body weight before and after intervention in both groups. The body weight on treatment group decreased by 0.81 ± 1.29 kg (p<0.05), while the body weight on the control group increased. Percentage of body fat and waist circumference decreased on both of groups, however treatment group decreased more than the control group. WHR no significant on both of groups. Yoga excercise resulted no significant influences on body weight, percentage of body fat, waist circumference and WHR in overweight women (p>0.05). Conclusion: Obesity women with 10 times yoga had no significant influences on body weight, percentage of body fat, waist circumference and WHR.
Korelasi persentase lemak tubuh dengan kadar adipsin pada premenopause
Authors: Welan Rahmani , Revilla Gusti , Desmawati Desmawati
Published: March 2019

Background: One of the conditions on premenopausal period is the increase in body fat, among which are caused by levels of the fluctuating estrogen hormone. Increase fat affects the body fat percentage and adipsin levels. Adipsin plays a role in the stimulation of insulin secretion by producing C3a, in which C3AR1 (C3a Receptor 1) fragments interact with beta cells to secrete insulin.Objective: The purpose of this study is to determine correlation of body fat percentage with adipsin levels on premenopause.Design: This was an analytical study with cross-sectional design. Body fat percentage was obtained by examination using Bioelectrical Impedance Analysis (BIA). Venous blood was taken at the mediana cubiti area used for serum adipsin levels. Adipsin levels were analyzed by Enzyme-linked Immunosorbent Assay (ELISA) technique.Results: The mean of body fat percentage on premenopausal was 36,18 ± 8,35%. The mean of adipsin levels on premenopausal was 117,05 ± 87,93 ng/ml. Result of Pearson test analysis got value r = 0,632 and value p = 0.0005 (p <0,05).Conclusions: There is a positive significant correlation between the percentage of body fat with adipsin levels on premenopause.
Treatment of gynecological malignancies: long-term follow-up of health-related quality of life and healthcare costs
Authors: Pynnä Kristiina , Vuorela Piia , Aronen Pasi , Sintonen Harri , Vainiola Tarja , Leminen Arto , Roine Risto P , Räsänen Pirjo
Published: March 2019

Aim:
To assess long-term health-related quality of life (HRQoL) and treatment-related costs in gynecological cancer patients, and to compare HRQoL between cancer types and to age-standardized general female population.
Materials & methods:
A prospective 8–10-year follow-up of 218 patients treated in Helsinki University Hospital in 2002–2004.
Results:
The most common malignancies were uterine, ovarian and cervical cancers. The mean HRQoL scores were 0.880 (baseline), 0.885 (6 months) and 0.884 for survivors in the end of the study. Depression, vitality and sexual activity were impaired at baseline but improved during follow-up. Total secondary healthcare costs during the follow-up averaged EUR 41342.
Conclusion:
The long-term HRQoL of surviving gynecological cancer patients was good and similar to that of age-standardized general female population.
Etapas evolutivas de la micología médica nacional: un nuevo y amplio capítulo de la micología chilena
Authors: Piontelli L. Eduardo
Published: March 2019

Se comenta la evolución de la Micología Médica nacional subdividida en tres etapas, relacionando su contenido científico en forma paralela con los aportes más significativos de la Micología Médica mundial.La primera etapa se denomina post-Grubiana (1892-1940), es iniciada por Fromel en el año 1892, caracterizada por una época netamente clínica con estudios dirigidos principalmente hacia las Dermatomicosis y Actinomicosis. Predomina la marcada influencia de la escuela Europea. Culmina con los aportes de un gran científico como fue el profesor Hugo Vaccari, que establece con sus discípulos los cimientos de la Micología contemporánea nacional.La segunda etapa denominada Renacentista {1940-1970), presenta un enfoque morfológico clínico neto donde además de las micosis superficiales el micólogo médico inicia la búsqueda de los agentes de las micosis profundas causadas por hongos oportunistas, en especial Aspergüosis y Candidosis. Se describen los primeros casos de Criptococosis, Histoplasmosis, Esporotricosis y Micetoma eumicótico podal. Se emprende la búsqueda de datos epidemiológicos mediante encuestas basadas en estudios de sensibilización a histoplasmina, paracoccidioidina y coccidioidina, que arrojaron resultados generalmente negativos.Destacan en esta época los nombres de Pozo, Honorato, Flores y Ferrada como impulsores de las corrientes micológicas influenciadas por la escuela americana, complementando a la tradicional escuela europea.La tercera etapa denominada Contemporánea (1970 ~), se aprecia una diversificación y transformación en el clínico que se pone en evidencia por su ampliación en el campo micológico, orientándose principalmente hacia el campo de la morfología, la inmunología, la ecología y la alergología. El diagnóstico inmunológico de las micosis se aplica como rutina en algunos centros hospitalarios y se pone énfasis en la terapia de algunas micosis sistémicas en especial Candidosis y Criptococosis.Se detectan .nuevos agentes oportunistas o patógenos tales como Scedosporium apiospermium, (Monosporium apiospermium), un nuevo caso de Esporotricosis y otros hongos en forma esporádica, indicando que nuestra patología se enriquecerá en la medida que se extienda el interés micológico de nuestros profesionales de la salud y se acerque el clínico hacia el micólogo, en un afán de solución conjunta de los problemas originados por las enfermedades fúngicas.
Caracteres farmacológicos de las drogas antifúngicas empleadas en medicina: segunda parte
Authors: Negroni Ricardo
Published: March 2019

En la segunda parte de este trabajo se comentan las características farmacológicas y los mecanismos de acción de drogas antifúngicas, tales como: fluorocitosina, griseofulvina, ketoconazol, clotrimazol y miconazol con la finalidad que el micólogo clínico o el médico no especializado conozca el manejo de estas drogas y puedan obtener una útil, simple y completa información.
Hongos termofilos en nidos de pajaros
Authors: Piontelli L. Eduardo , Toro M. A. , Galeas A.
Published: March 2019

Mediante el estudio del material empleado en la construcción de 77 nidos de pájaros silvestres, se aporta información referente .a hongos termófílicos y termotolerantes de Chile.Los resultados se analizaron considerando las siguientes variables: tipo de material empleado por estas aves, especie de pájaro e influencia de las condiciones climáticas, todo esto en relación con algunos aspectos ecológicos. 'En los cultivos de los materiales usados en la construcción de los nidos y subdividido en 4 tipos: (I) Hierbas, hojas, semillas, raicillas; (II) Hierbas, pelos, plumas; (III) Hierba, barro y (IV) Hierba, barro y excrementos: los tipos I, II y III, presentaron la mayor variedad de especies y la mayor cantidad de aislamientos. El número de colonias fúngicas según los períodos estacionales (primavera-verano y otoño-invierno}, no ofreció variaciones significativas.Las especies que experimentaron fluctuaciones, de cierta magnitud fueron: Rhizomucor miehei (Cooney y Emerson) Schipper, Rhizomucor pusillus (Lindt) Schipper, y Malbranchea sulfurea (Miehe) Sigler y Carmichael, que primaron en otoño-invierno.Las especies dominantes en ambos periodos y en orden decreciente fupon: Aspergillus fumigatus Fres., Rhizomucor pusillus (Lindt)Shipper, Thermomyces lanuginosus Tsiklinsky, Rhizomucor miehei (Cooney y Emerson) Schipper, Malbranchea sulfúrea (Miehe) Sigler y Carmichael y Emericella nidulans var. nidulans (Eidam) Vuillemin.La especie más frecuente en todos los nidos fue Aspergillus fumigatus Fres., con una presencia de un 98,7%.Se comenta la posición taxonómica y la .importancia en patología de algunos de los géneros aislados.La especie más significativa a pesar de su escasa presencia, fue Dactylomyces thermophilus Sopp, del cual no poseemos antecedentes que se haya registrado en el hemisferio Sur, ni en Chile.
Gender Differences in Body Image Misperception According to Body Mass Index, Physical Activity, and Health Concern among Korean University Students
Authors: Chung Woo-Suk , Shin Ki Ok , Bae Ju Yong
Published: March 2019

Background and Objective

The purpose of this study was to investigate the gender differences in body image misperception, analyzed according to the body-mass index (BMI), physical activity, and health concern among Korean university students.

Material and Methods

Three-hundred-and-thirty-nine students participated. Body image misperception was examined through data on subjective body image perception and differences in the measured BMI.

Results

A total of 45.9% of the male students perceived their body shape measurements to be lower and 18.9% of the female students perceived them to be higher than the actual values. Body image misperception, according to the BMI, significant differences by gender were observed in the underweight (p < .045), standard weight (p < .000), and overweight groups (p < .000). For body image misperception, according to the amount of physical activity, significant differences by gender were observed in the inactivity (p < .001), minimum activity (p < .000), and health-enhancing activity groups (p < .000); significant differences by gender were also observed in the low health concern (p < .000) and high health concern groups (p < .000).

Conclusion

The prevalence of body image misperception was high, and the degree of misperception varies by gender. Therefore, educational efforts to reduce instances of body image misperception are needed for healthy weight management, and these efforts should take into consideration the gender differences.
RATES AND PREDICTORS OF HUMAN PAPILLOMAVIRUS VACCINATION AMONG YOUNG MEN RECRUITED FROM URBAN CLINICAL AND COMMUNITY SETTINGS
Authors: Morrow Charlene , Ding Lili , Gorbach Pamina , Chandler Emmanuel , Crumpton Marilyn , Kahn Jessica Annette
Published: March 2019

Background and Objective

Human papillomavirus (HPV) vaccination rates are suboptimal in young men, representing a missed opportunity to prevent cancers caused by HPV. Data about factors associated with vaccination over time are important to design interventions that improve vaccination rates. The aims of this study were to determine HPV vaccine initiation and completion rates in young men 13-26 years of age recruited from clinical and community settings from 2013-2014 and 2016-2017, and to determine factors associated with vaccination.

Material and Methods

Men (N=747) were recruited from a hospital-based teen health center (THC), health department sexually transmitted disease clinic (HDSTD) and the general community. Participants completed a self-administered survey assessing demographic and behavioral factors. Vaccination status was determined using the electronic medical record and a statewide immunization registry. We determined vaccine initiation and completion rates, by recruitment site and year. We determined factors independently associated with vaccine initiation and completion, overall and stratified by recruitment year, using multivariable logistic regression.

Results

Mean age was 21.2 years, 258 (34.5%) had initiated the vaccine series and 154 (20.8%) had completed it. Those recruited from the THC (vs. community and HDSTD) were more likely to initiate (71.3%, 23.2%, and 19.5%, respectively, p<.0001) and complete (50.7%, 11.7%, and 8.3%, p<.0001) the series. In multivariable analysis, variables associated with vaccine initiation were younger age (13-17 vs. 22-26 years: AOR 5.31), insurance plan (Private vs. Medicaid: OR 0.39; Medicaid vs. others: AOR 2.22), no cigarette smoking (no vs. yes: AOR 1.78) and recruitment site (THC vs. HDSTD: AOR 3.74; THC vs. community: AOR 3.01). Variables associated with vaccine completion were younger age (13-17 vs. 22-26 years: AOR 3.55; 18-21 vs. 22-26 years: AOR 4.26), insurance plan (Private vs. Medicaid: AOR 0.51; Medicaid vs. others: AOR 2.62), fewer lifetime female partners (1 vs. 2-10: AOR 2.55; 1 vs. 11+: AOR 2.23) and recruitment site (THC vs. HDSTD: AOR 4.99; THC vs. community: AOR 3.95).

Conclusion

HPV vaccine initiation and completion rates were low among young men over the 6 years after vaccine recommendations for men. Men who reported behaviors that have been associated with a higher risk for HPV were less likely to be vaccinated. Interventions that improve access to a primary care medical home and insurance programs that cover vaccination costs may increase HPV vaccination rates in young men.
Perancangan Animasi Pembangkit Listrik Biomassa dan Sampah Sebagai Bagian dari Listrik Kerakyatan untuk Media Pembelajaran
Authors: Aziza Rosida Nur , Indah Susanti Meilia Nur , Abdurrasyid Abdurrasyid , Siswipraptini Puji Catur
Published: March 2019

Kebutuhan akan listrik di Indonesia semakin meningkat. Salah satu usaha untuk memenuhi kebutuhan listrik di Indonesia adalah dengan melibatkan masyarakat untuk membangun pembangkit listrik yang berbahan bakar biogas dan biomassa, baik yang berasal dari sampah atau berbagai jenis tanaman yang sesuai.  Pembangkit listrik yang dikenal sebagai Pembangkit Listrik Biomassa ini sudah banyak diterapkan di berbagai kota di Indonesia, namun proses pembuatannya masih belum diketahui oleh masyarakat. Oleh karena itu, penelitian ini akan menghasilkan animasi Pembangkit Listrik Tenaga Sampah (PLTSa) dan Pembangkit Listrik Biomassa untuk sarana edukasi bagi masyarakat. Pembuatan animasi ini menggunakan bahasa pemrograman Visual Basic.Net dan metode pengembangan Multimedia Development Life Cycle (MDLC), yang dimulai dimulai dari pengumpulan data, perancangan multimedia dan hasil yang dicapai adalah berupa animasi.
Aplikasi Pengambilan Keputusan Indeks Kepuasaan Masyarakat Dengan Metode Perbandingan Eksponensial (MPE) Pada Unit Pelayanan Masyarakat Dengan Alat Microcontroller Sebagai Alat Bantu Survey
Authors: Devianto Yudo , Dwiasnati Saruni
Published: March 2019

Kepuasan masyarakat merupakan faktor yang sangat penting dan menentukan keberhasilan suatu badan usaha karena masyarakat adalah konsumen dari produk yang dihasilkannya. hal ini didukung oleh pernyataan K. Douglas Hoffman dan Jhon E.G Beteson, yaitu: “without costumers the service firm has no reason to exist”. Di sisi lain, peperangan terbesar dalam dunia pemasaran sebenarnya adalah peperangan memperebutkan heart share konsumen. Pedoman Umum Penyusunan Indeks Kepuasan Masyarakat Unit Pelayanan Instansi Pemerintah adalah mengetahui sejauh  mana  kualitas pelayanan yang telah diberikan aparatur kepada masyarakat. Hal tersebut juga berlaku kepada divisi yang memberikan pelayanan kepada mahasiswa/i. Membuat AplikasiPengambilan Keputusan Indeks Kepuasan Masyarakat Pada Unit Pelayanan yang diharapkan dapat memberikan informasi yang akurat tentang kualitas kinerja dari unit pelayanan tersebut. Metode Perbandingan Eksponensial (MPE) merupakan salah satu metode untuk menentukan urutan prioritas alternatif keputusan dengan kriteria jamak. Teknik ini digunakan sebagai pembantu bagi individu pengambilan keputusan untuk menggunakan rancang bangun model yang telah terdefinisi dengan baik pada tahap proses. Penelitian ini juga memberikan saran mengatasi masalah dalam pengembangan dalam penambahan seperti input keyboard. Microcontroller adalah suatu alat elektronika digital yang mempunyai masukan dan keluaran serta kendali dengan program yang bisa ditulis dan dihapus dengan cara khusus, cara kerja mikrokontroler sebenarnya membaca dan menulis data yang bersifat open source, arduino juga mempunyai bahasa pemrogramannya sendiri yang berupa bahasa C. Arduino Uno adalah board microcontroller berbasis ATmega328 (datasheet). Memiliki 14 pin input dari output digital dimana 6 pin input tersebut dapat digunakan sebagai output PWM dan 6 pin input analog, 16 MHz osilator kristal, koneksi USB, jack power, ICSP header, dan tombol reset.
Aplikasi Sistem Order Jasa Graphic Designer Berbasis Web Pada PT. Decorner
Authors: Anastasia Arishita Nurul , Handriani Inge
Published: March 2019

Decorner is a company engaged in the service of photography. In the development of its business, Decorner has a vision to provide the best service for customers and earn the trust of customers. To realize this vision, we need a means of web-based information. This facility aims to facilitate customers in making reservations photography services for a particular event. In the process of making a website, the first step is to analyze the system in the company, making the system design, design web menu structure and interface design of the web, after it determined the use of the software. In this application, the software used is Adobe Dreamweaver CS6 interface design to manufacture, MySQL as a database to store data off site and PHP scripts for the programming language. The results obtained in this application is the application of information systems web-based photography services reservation at Decorner. On the website Decorner equipped with photography package offered, the page order, the payment confirmation page and testimonials as well as the administrator to manage the content of the page or web content.
Persamaan Lorenz untuk Keamanan Nomor Serial Sistem Operasi Window7
Authors: Rohan Dewanto Harwin , Hayati Nur
Published: March 2019

Serial number of operating system windows 7 needs to be safeguarded, so can’t be used by the others. Security of the data can use by modern cryptography such as Vernam Cipher methods and classic cryptography such as Caesar Cipher methods. The security level both of this method depends on the keywords used and it will difficult to crack if the random key is used more and more. To get a random key, we can take from chaos of Lorenz equations as key-generator for encryption and description. Before utilizing chaos in the Lorenz equations, we have to find the maximum t (time) for the inverse problem solution to fit with the forward problem solution. We can use Runge-Kutta method in the Lorenz equations for forward problem solution and inverse problem solution. The solution of integral that obtained by the Runge-Kutta method can be searched by Trapezoidal method. The result of Runge-Kutta solution and Trapezoidal will be used as key-generator for encryption and description. In the simulations performed, the best orde in Runge-Kutta method is 4 and t max is 2. The encryption key is used as the initial condition of Lorenz equation, then the result is integrable by the Trapezoidal method. The result of orde 4 from Runge-Kutta method and Trapezoidal method used as a key-generator.  Application of Lorenz equation as key-generator for encryption and decryption, may change the cryptography algorithms of symmetric to be asymmetric.
Evaluasi Sistem Informasi Akuntansi Persediaan Pada Dira Supermarket (Dira Shopping Center) Ambulu
Authors: Qutsiyah Inayatul , Halim Moh. , Mirwan A Rendy
Published: March 2019

Tujuan penelitian ini adalah untuk mengetahui kesesuaian sistem informasi akuntansi persediaan menurut konsep dan teori pada Dira Supermarket Ambulu. Jenis data yang digunakan adalah data kualitatif dengan sumber data primer dan sekunder. Penelitian ini dilakukan dengan teknik analisis data kualitatif melalui wawancara dan dokumentasi. Hasil penelitian menunjukkan bahwa sistem informasi akuntansi yang diterapkan oleh Dira Supermarket Ambulu terdapat beberapa prosedur yang tidak sesuai dengan konsep dan teori
Pengaruh Partisipasi Pemakai Sistem Informasi, Kemampuan Pemakai Sistem Informasi, Ukuran Organisasi Terhadap Kinerja Sistem Informasi Akuntansi
Authors: Fatmawati Indra , Cahyono Dwi , Maharani Astrid
Published: March 2019

Penelitian ini bertujuan untuk menganalisis pengaruh partisipasi sistem informasi pengguna, kemampuan pengguna sistem informasi, ukuran organisasi terhadap kinerja sistem informasi akuntansi (studi empiris pada OPD (organisasi daerah Kabupaten Lumajang). Dalam penelitian ini adalah karyawan / karyawan & karyawan pengguna teknologi informasi di Kantor Wilayah (Perangkat Daerah) Kabupaten Lumajang, berjumlah 50 orang. Metode analisis data yang digunakan adalah metode analisis regresi linier berganda. Uji hipotesis yang digunakan adalah uji t, uji F dan koefisien tekad. Hasil penelitian menunjukkan bahwa partisipasi pengguna sistem informasi berpengaruh pada kinerja SIA (Organisasi Perangkat Daerah) OPD Kabupaten Lumajang. Kemampuan pengguna sistem mempengaruhi kinerja SIA (Organisasi Perangkat Daerah) Kabupaten Lumajang. Ukuran organisasi memengaruhi kinerja OPD SIA (Organisasi Perangkat Daerah) Kabupaten Lumajang
SANITASI BERBASIS MASYARAKAT DI PESANTREN PUTRI AL-ITTIHAD, KABUPATEN CIANJUR
Authors: Hasbiah Astri Widiastuti , Rusmaya Deni , Apriani Damar
Published: March 2019

Pemenuhan fasilitas sanitasi merupakan salah satu kegiatan yang penting dalam kehidupan domestik manusia. Sebagai asrama yang ditempati oleh santri, Pesantren Putri Al-Ittihad harus menjaga fasilitas sanitasinya guna menjaga kesehatan para santri putrinya. Penelitian ini bertujuan untuk mengidentifikasi kondisi sanitasi di pesantren tersebut serta menganalisis kebutuhan air minum dan fasilitas sanitasi yang diperlukan dalam kegiatan keseharian santrinya. Metode yang digunakan dalam analisis ini adalah pengamatan lapangan serta wawancara kepada 95 santri sebagai responden. Hasil penelitian menunjukkan bahwa secara kualitas, air bersih masih dapat diterima santri karena tidak berbau, tidak berasa dan tidak berwarna, namun secara kuantitas masih belum memenuhi dan perlu ditambah dari sumber air berupa mata air yang terletak di sekitar pesantren. Pengelolaan sampah belum optimal karena sampah organik belum dimanfaatkan. Jika kegiatan pengomposan dilakukan, maka perlu rumah pengomposan dengan luas 13,5 m3. Terdapat 137 ruang mandi yang disediakan untuk 1785 santri. Berdasarkan ketentuan dan perhitungan, jumlah MCK seharusnya minimal 179 ruang. Fasilitas dan teknologi lain yang perlu disediakan adalah lubang biopori untuk mengatasi genangan dan septic tank untuk mengolah air limbah.
IDENTIFIKASI NILAI LAJU DEOKSIGENASI DI DAERAH PADAT PENDUDUK (STUDI KASUS SUNGAI CICADAS, BANDUNG)
Authors: Yustiani Yonik Meilawati , Wahyuni Sri , Kadir Arry Akbar Abdul
Published: March 2019

Buangan limbah cair yang berasal dari kegiatan domestik mengandung BOD yang relatif tinggi. Secara alamiah, polutan organik yang masuk ke badan air penerima dapat didegradasi melalui proses self purification. Proses degradasi ini dapat direprestasikan dengan penurunan oksigen atau deoksigenasi, sedangkan laju deoksigenasi menandakan kecepatan degradasi tersebut berlangsung. Penelitian ini bertujuan untuk mendapatkan nilai laju deoksigenasi di Sungai Cicadas, Bandung, yang memiliki pencemaran berat akibat buangan cair dari daerah padat penduduk. Metode yang digunakan adalah pengamatan laboratorium selama 10 hari pada sampel yang diambil di 3 titik. Pengolahan data yang dilakukan menggunakan Metode Slope. Selain itu, laju deoksigenasi juga dihitung menggunakan rumus empiris yang dikeluarkan oleh Hydroscience. Hasil penelitian ini menunjukkan bahwa laju deoksigenasi berkisar antara 0,01 hingga 0,17 per hari. Jika dibandingkan dengan hasil perhitungan menggunakan rumus empiris, nilai ini sangat kecil. BOD ultimate yang diperoleh memiliki rentang antara 42,76 hingga 682 mg/L. Nilai laju deoksigenasi yang rendah ini memperlihatkan bahwa walaupun limbah dari kegiatan domestik mudah didegradasi, namun proses degradasi dapat berlangsung lambat akibat faktor-faktor penghambat yang kemungkinan terjadi pada sungai tersebut.
Experimental Investigation of the Operation Modes of a Flat Loop Heat Pipe
Authors: Nedaivozov A. V. , Afanasiev V. N.
Published: March 2019

The paper presents the experimentally investigated operation modes of a flat loop heat pipe (LHP). The LHP is an efficient heat transfer device operating on the principle of evaporation-condensation cycle and successfully applied in space technology, including cooling heat-stressed components of electronic devices and computer equipment.

We have experimentally studied how design parameters of the vapor line and its coolant flow influence on the LHP operation mode and also have determined the causes for emerging oscillatory mode of the LHP operation at low heat load. The paper depicts the experimentally measured temperatures in the LHP characteristic points and the photographs of the coolant flow in the vapor line.

Based on the experimental data, we have drawn the following conclusions:

A vapor-liquid coolant flow in the vapor line in the range of the heat loads under consideration has been detected. There is no superheating vapour observed.

The flow regime of the vapor-liquid mixture depends on both the heat load and the vapor pipe diameter. The decrease in the internal diameter of the investigated vapor line section from 7 mm to 4 mm led to the increase of its vapor content and to the decrease of the heating surface temperature when the heat loads were above 80 W. For example, the temperature of the heating surface T1 decreased from 109.5 °С to 100 °С at a heat load of 110 W. Reducing the heat load from 80 W to 60 W leads to a change in the flow regime of the vapor-water mixture from the annular to the slug regime.

 Found that at low heat loads (up to 40 W), there is no LHP loop operation observed. Periodic fluctuations in the water level in the vapor line are detected. The LHP operates in thermo-syphon mode. For these heat loads, the influence of the vapor line diameter on the thermal state of the LHP is not observed.

Found that at low heat loads the LHP operation mode depends only on the flow regime of the coolant in the vapor line. With the annular regime of the coolant flow in the vapor line, a stationary mode of operation of the LHP is observed. When changing the flow regime of the coolant from the annular to the slug, the LHP operation mode is changed from stationary to oscillatory.
Development of Welding Technology for Tracked Vehicle Track Based on Computer-simulated Stress-Strain State
Authors: Titiov D. Yu. , Korolev S. A.
Published: March 2019

The article dwells on the applications of computer simulation techniques to solve specific tasks in manufacturing. The problem under consideration is relevant because these broadly used methods allow us to save a significant amount of time and material resources, which is an important factor in current manufacturing operation conditions.

Conducts computer analysis of thermal strain processes occurred when welding a track of the tracked vehicle chain component. Performs a finite-element model of the product, specifies the material and environment properties, the fastening conditions, and the welding modes. Considers three options for laying welds. Based on simulation results, residual displacements, arising in the crest during welding, have been obtained. The most optimal method for laying welds is selected where no further product post-treatment is required.

The study shows that computer simulation is an efficient tool to solve the tasks, when their analytical calculating is impossible or in case it is unreasonable to conduct full-scale experiments because of high costs. Varying of different parameters allows us to estimate a quality of developed technology without multiple experiments.
Analysing Mechanical Systems in Domestic and Foreign CAD Systems
Authors: Martynyuk V. A. , Trudonoshin V. A. , Fedoruk V. G.
Published: March 2019

The article considers applications of foreign CAD-systems in creating the challenging projects at domestic enterprises and design bureaus. As stated in the article "... presently, there is no domestic CAD-system that could completely replace such foreign products as NX, CATIA, Credo". Besides, due to international cooperation in creating the challenging projects (for example, the project to create a modern wide-body aircraft, proposed jointly with China), it makes sense to use the worldwide known and popular CAD systems (the aforementioned NX, CATIA, Credo).

 Therefore, in the foreseeable future, we will still have to use foreign software products. Of course, there always remains a question of the reliability of the results obtained. Actually, this question is always open regardless of what software product is used - domestic or foreign. This question has been haunting both developers and users of CAD systems for the last 30 to 40 years. But with using domestic systems, it is much easier to identify the cause of inaccurate results and correct the mathematical models used, the methods of numerical integration applied, and the solution of systems of nonlinear algebraic systems. Everything is much more complicated if we use a foreign software product. All advertising conversations that there is a tool to make the detected errors available to the developers, remain only conversations in the real world. It is easily understandable to domestic users, and, especially, to domestic developers of similar software products. The existing development rates and competition for potential buyers dictate a rigid framework of deadlines for releasing all new versions of the product and introducing the latest developments into commercial product, etc. As a result, the known errors migrate from version to version, and many users have accepted it long ago. Especially, this concerns the less popular tools rather than the most popular applications (modules) of a CAD system. For example, in CAD systems, the "Modeling" module where geometric models of designed parts and assembly units are created has been repeatedly crosschecked. But most of the errors are hidden in applications related to the design of parts from sheet material and to the pipeline design, as well as in applications related to the analysis of moving mechanisms and to the strength or gas dynamic analysis by the finite element method.

The article gives a concrete example of a moving mechanism in the analysis of which an error was detected using the mathematical model of external influence (a source of speed) in the NX 10.0 system of Siemens.
Simulation of Aircraft Landing
Authors: Dzhamgarov S. G. , Oleynikov V. I. , Trudonoshin V. A. , Fedoruk V. G.
Published: March 2019

The article proposes a mathematical model of the aircraft landing upon touchdown operation. The mathematical model can be used at the early design stages to select the rational parameters of shock absorbers to ensure soft landing. Unlike most of the papers in the field concerned, it describes the simulation of the aircraft's run-out process rather than the first touchdown impact or Dynamic Drop Testing. This is due to the use of three-dimensional mathematical models of mechanical systems, including the aircraft body. In addition to the forces on the aircraft, the article gives a sufficiently detailed representation of the forces that arise in the shock absorber. The simulation results obtained using the PA8 complex developed at the CAD Department in Bauman Moscow State Technical University are presented. The diagrams presented show the effect of the clearance in the chambers of recovery stroke on the operation of shock absorbers and, as a consequence, on ensuring the soft landing conditions. An object-oriented approach, implemented in the complex, allows us to evaluate the influence of each element on the system dynamics. The article presents the time diagrams of the force of a gas spring taking into account the dry friction and the hydraulic force in the shock absorber. In conclusion, a rational, in authors’ opinion, approach to designing shock absorbers is shown. One of the points of this approach is the validation of shock absorber parameters based on the results of Dynamic Drop Testing and, after that, simulation of the aircraft landing with validated parameters. Such a technique will allow us to minimize the number of field experiments, and as a result, will shorten the design time and put the product into operation.
Multi-trajectory Fitness Function-based Method of Automated Test Coverage for Code Using Evolutionary Algorithms
Authors: Solomatina D. I. , Filippov M. V.
Published: March 2019

Testing is a time consuming and resource intensive task. Testing often takes about half of the total project development time.

Hence, in recent times, a lot of studies have considered the issues of the process automation of creating and running tests. Recently, a lot of papers have been published in the field concerned. However, most of them use unit testing, in which the coverage of different program fragments occurs independently of each other. Therefore, the internal structure of the program was not taken into account.

The article presents a method to build a test suite based on evolutionary algorithms that takes into account the features of the entire program, as a whole.

Evolutionary algorithms are a class of optimization algorithms that has been widely developed lately, using the ideas of artificial intelligence and intended for conducting directed search. They allow successful solving the problems of software testing, such as testing embedded systems and automatic construction of unit tests.

With implementing evolutionary approach the article has solved the following tasks. Proposed a method for determining the fitness function, which allows us to consider an approximation along all possible trajectories, which provides a solution to the problem of coverage in almost any case. However, the number of such trajectories can be quite large, which leads to a significant increase in test execution time. Proposed a method of approximation along all possible trajectories, allowing testing to be done in a reasonable time. Time costs to achieve the goal are reduced by selecting such a trajectory among all possible ones for which a distance value to the instruction is minimal.

To study the proposed method, there were four different tasks each of which involved about 1000 runs. The presented research results have shown that the given method is more reliable than the commonly used approaches in which the reference trajectory is selected. In addition, an estimate of time costs has shown that the discussed method has higher efficiency.
Calculation of Deviations of Shape, Size and Location of Flat Surfaces
Authors: Kravchenko I. I. , Kiselev V. L.
Published: March 2019

The development of computerization allows the development of mathematical models of physical processes with different methods of blade machining of machine parts. Modern programmable CNC machines have the ability to produce parts in an automated cycle, ensuring the requirements of the drawing. Control of the quality of processing of the main flat surfaces, which are technological and Assembly bases, should be considered in more detail. Their accuracy in accordance with the standards is determined by the shape deviations from the adjacent planes, size and relative position. The standards have instructions on how to create a virtual adjacent plane using adjustable supports and further scan the ordinates of its individual points to calculate the deviation of the form. To quantify the deviations of shape, size and location is not enough to have a field f, the vectors of which are defined from the geometric plane, given the nominal size, it is necessary to establish a base for their reference. The question of establishing bases for reference is not only of fundamental importance, since different bases can be obtained different values of deviations. The paper proposes a mathematical model for determining the named parameters of accuracy from the middle planes, which are determined by the calculated vectors at specific points of the treated surface when processing batches of blanks on milling machines face milling.
Exploring Practicability for Solving a Task Based on the Generalized Cellular Automata via SAT Solvers
Authors: Klyucharev P. G.
Published: March 2019

The paper deals with exploring practicability to solve a task of the recovery key of generalized cellular automata via SAT solvers.

The problem, which we call a task of the key recovery of generalized cellular automata, is under consideration. This task is formulated as follows. The generalized cellular automata, the positive integer s, the initial values of some cells, and the values of some cells after the s steps of the automata are given. It is required to find the initial values of the remaining cells (their number will be called the key length).

To solve the task, were tested Picosat, MiniSat, Glucose, Lingeling, and CryptoMiniSat SAT solvers. In further computational experiments, was used the MiniSat, which was the best.

The key recovery task was solved for the generalized cellular automata of a small size via the MiniSat SAT solver. Pizer's graphs were used as graphs of the automata. The key length was approximately half the number of the cells in the automata. As a result of the study, it turned out that operation time of a SAT solver quite significantly (several orders of magnitude) exceeds the estimated time of solution using the FPGA exhaustive method, and the empirical dependencies of the SAT-solver operation time on the key length are exponential.

The obtained results confirm that SAT solvers disable effective solving a task under consideration. This allows giving the better reasons for the cryptographic security of the crypto-algorithms based on the generalized cellular automata with regard to the cryptanalysis methods using SAT solvers.