Synthesis of the Missile Homing System Taking into Account the Dynamic Characteristic of the Measurement Elements

2019 ◽  
Vol 20 (4) ◽  
pp. 251-256 ◽  
Author(s):  
. Do Quang Thong
Keyword(s):  
Dynamic Characteristic ◽  
Dynamic Characteristics ◽  
Dynamic Properties ◽  
Optimization Method ◽  
Frequency Noise ◽  
Negative Effects ◽  
Second Stage ◽  
Basic Functions ◽  
Two Stages

Several various missile homing systems (MHS) have been developed in recent years. However, to the best of our knowledge, these systems do not take into account the dynamic characteristics of the measurement elements (ME). Such existing systems can only work well when the MEs have a small inertia and large damping. Thus in general case, it is necessary to consider the dynamic characteristics of the MEs with the big inertia. In addition, using the MEs with the big inertia, the MHSs is able to remove the high-frequency noise. However, taking into account the dynamic properties of the MEs causes difficulties in determining the transfer function (PF) of the normal acceleration stability system and the synthesis of MHSs. Therefore, in this paper, we propose an effective mathematical model of the missile homing system, which takes into consideration the dynamic characteristics of the MEs. In addition, this model allows synthesizing the high accuracy MHSs, and utilizing the MEs with the inertia equivalent to the inertia of the rudder actuator. To accomplish that, the proposed system is composed of two stages. In the first stage, the MHSs, which do not incorporate the dynamic characteristics of the MEs, is presented in detail. Then, we analyze and estimate the effect of the dynamic characteristics of the MEs on the performance of the MHSs. In the second stage, we propose a novel MHS, which takes into account the dynamic characteristics of the MEs. The proposed system is implemented based on the basic functions in the Control system toolbox in MATLAB, and designed by the parametric optimization method. The simulation results indicate that, our proposed system outperforms the conventional MHSs in term of reducing the negative effects of the dynamic characteristic of the MEs on the quality of the MHS.

A novel two-stage method of plant seedlings classification based on deep learning

2021 ◽  
pp. 1-11
Author(s):  
Tianhong Dai ◽  
Shijie Cong ◽  
Jianping Huang ◽  
Yanwen Zhang ◽  
Xinwang Huang ◽  
...  
Keyword(s):  
Deep Learning ◽  
Learning Technology ◽  
Two Stage ◽  
Second Stage ◽  
Stage Classification ◽  
Different Types ◽  
Two Stages ◽  
Plant Seedlings

In agricultural production, weed removal is an important part of crop cultivation, but inevitably, other plants compete with crops for nutrients. Only by identifying and removing weeds can the quality of the harvest be guaranteed. Therefore, the distinction between weeds and crops is particularly important. Recently, deep learning technology has also been applied to the field of botany, and achieved good results. Convolutional neural networks are widely used in deep learning because of their excellent classification effects. The purpose of this article is to find a new method of plant seedling classification. This method includes two stages: image segmentation and image classification. The first stage is to use the improved U-Net to segment the dataset, and the second stage is to use six classification networks to classify the seedlings of the segmented dataset. The dataset used for the experiment contained 12 different types of plants, namely, 3 crops and 9 weeds. The model was evaluated by the multi-class statistical analysis of accuracy, recall, precision, and F1-score. The results show that the two-stage classification method combining the improved U-Net segmentation network and the classification network was more conducive to the classification of plant seedlings, and the classification accuracy reaches 97.7%.

scholarly journals Dynamic Characteristics in the Design of Maglev Suspensions

1994 ◽  
Vol 208 (1) ◽  
pp. 33-41 ◽  
Author(s):  
R Goodall
Keyword(s):  
Dynamic Characteristics ◽  
Transfer Functions ◽  
Controller Design ◽  
Design Method ◽  
Vehicle Speed ◽  
Passenger Comfort ◽  
Operational Conditions ◽  
Second Stage ◽  
Maglev Vehicle

The paper reviews the essential functions which apply to any kind of suspension, and distinguishes between the various inputs to which a suspension is subjected. These are used to assess the particular characteristics of an electromagnetically suspended (Maglev) vehicle, and to identify considerations which have important implications for the controller design, irrespective of the design method. Some general equations are developed which interrelate the vehicle speed, the quality of the track and the passenger comfort requirements, and these are used to identify operational conditions for which a second stage of suspension becomes necessary (that is, in addition to that provided by the magnets). The importance of understanding the suspension's response to deterministic track inputs is also highlighted. Although the paper is directed towards Maglev, the analysis is strongly based upon a consideration of the suspension transfer functions, and so many of the principles are applicable to actively controlled supensions in general.

scholarly journals Madrasah Principal Leadership Role in Improving Teachers’ Performance

2021 ◽  
Vol 1 (1) ◽  
pp. 10
Author(s):  
Sarmi Sinta Putri ◽  
Safri Mardison
Keyword(s):  
Principal Leadership ◽  
Program Planning ◽  
Preliminary Observation ◽  
Leadership Role ◽  
Data Display ◽  
Learning Program ◽  
Second Stage ◽  
Two Stages

This study aims to describe the role of the madrasah principal in improving teachers’ performance. This was a descriptive qualitative study. Observation, interviews, and documentation were used to collect the data. The source of data were the principal and teachers of MTsN 4 Muko-muko. Data were analyzed in two stages: the first stage was preliminary observation and the second stage was the research which included three steps, namely data reduction, data display, and data verification. Trustworthiness data were tested by conducting triangulation. The result indicated that principal leadership in improving the quality of teachers’ performance included Discipline Development Supervision Program (PPD), Supervision and Evaluation (SDE) activity, and Learning Program Planning. These findings are the basic of how discipline, supervision, and learning program planning become the indicators of guidance to improve the quality of teachers’ performance.    

scholarly journals PENGGUNAAN KARTU KUARTET UNTUK MENINGKATKAN PEMAHAMAN KEBERAGAMAN SENI TRADISI NUSANTARA PADA SISWA SEKOLAH DASAR

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Karsono ◽  
Yudianto Sujana ◽  
Joko Daryanto ◽  
Ngadino Yustinus
Keyword(s):  
Elementary School ◽  
Learning Process ◽  
Research Approach ◽  
Traditional Art ◽  
Is Implementation ◽  
Second Stage ◽  
Action Research Approach ◽  
Two Stages ◽  
Traditional Arts

<p>The purpose of this research is to improve the quality of the learning process subjects Culture Art and Skills in elementary school, especially in understanding of the diversity of Indonesian traditional art. This research was conducted in two stages. First, to develop a media card quartet, and second stage is implementation of the themed quartet card into the learning process in the classroom. Research methods use classroom action research approach because the quartet card media was subsequently used in the learning process in the classroom to improve understanding. Source of data collected by conducting interviews, tests, observations, and documentation. The analysis of the data using Miles and Hubberman’s interactive model, includes the step of data reduction, data display, and conclusion. The results showed that the use of card-themed quartet can enhance students' understanding of elementary school SDN 01 Jatisawit and SDN Dilem in the diversity of Indonesian traditional art material. Keywords: instructional media, cards quartet, the diversity of traditional arts.</p><p>Penelitian ini hendak memperbaiki kualitas proses pembelajaran mata pelajaran Seni Budaya dan Keterampilan (SBK) di sekolah dasar (SD) dalam aspek pemahaman peserta didik akan materi pembelajaran keragaman seni tradisi nusantara. Secara garis besar penelitian ini dilakukan dalam dua tahapan. Tahapan pertama melakukan pengembangan media kartu kuartet, dan tahapan kedua yaitu tahap implementasi kartu kuartet bertema budaya nusantara tersebut ke dalam proses pembelajaran di kelas. Metode penelitian menggunakan pendekatan penelitian tindakan kelas karena media kartu kuartet yang dibuat selanjutnya digunakan dalam proses pembelajaran di kelas untuk meningkatkan pemahaman materi keragaman seni tradisi. Sumber data dikumpulkan dengan melakukan wawancara, tes, observasi, dan dokumentasi. Sedangkan analisis data menggunakan model analisis interaktif dari Miles dan Huberman meliputi tahap reduksi data, penyajian data, dan penarikan kesimpulan. Hasil penelitian<br />memperlihatkan bahwa penggunaan kartu kuartet bertema seni tardisi nusantara dapat meningkatkan pemahaman siswa sekolah dasar SDN 01 Jatisawit dan SDN Dilem, dalam materi keberagaman seni tradisi nusantara.</p>

Rubberised fabric for fuel soft storage tanks*

2018 ◽  
Vol 45 (7) ◽  
pp. 322-324
Author(s):  
Yu.N. Rybakov ◽  
A.V. Dedov ◽  
D.S. Plokhoi ◽  
D.V. Kolotilin
Keyword(s):  
Diffusion Processes ◽  
Motor Fuel ◽  
Residual Monomer ◽  
Experimental Conditions ◽  
Second Stage ◽  
Before And After ◽  
Nitrile Rubbers ◽  
Two Stages ◽  
Kinetics Of

The kinetics of extraction of dibutyl sebacinate by different grades of motor fuel from rubberised fabric based on a blend of nitrile rubbers SKN-26M and SKN-40M was investigated. The kinetics was determined according to the GOST 9.030-74 standard from the change in weight of the specimen after holding in fuel at 50°C and drying. The change in quality of the fuel after contact with the fabric was recorded from the change in the content of existent gum in fuel according to GOST 1567-97 (ISO 6246-95) and its acidity according to GOST 5985-79 before and after contact with the rubberised fabric. It was shown that the process of extraction proceeds in two stages, the time of the first of which under experimental conditions is not dependent on the type of fuel. The rate of the first stage is much higher than the rate of the second stage. The relation of rates and proportion of extracted fuel at the first and second stages depends on the type of fuel. It can be asserted that the surplus amount of extracted substances is made up of impurities, which include residual monomer or its derivatives and substances used in the synthesis of the rubber. The mechanism of extraction with extractant counterflow into the vulcanisate and its dependence on the grade of petrol is proposed, based on allowance for the diffusion processes in the system.

Do Teacher Attitudes Impact TeachingThrough Information Technology

2017 ◽  
Vol 4 (24) ◽  
Author(s):  
Suman Kumari Katoch
Keyword(s):  
Information Technology ◽  
Study Data ◽  
Survey Method ◽  
School Teachers ◽  
Second Stage ◽  
Good Sample ◽  
Two Stages ◽  
Quality Of Research ◽  
Selection Of

Teachers’ styles, and mainly their attitudes, are strong context outcomes, rooted in experience and do not become automatic routine conducts, in the sense that they are developed via very slow interactions and become well established constructs for each individual only after some time. In that sense attitudes can be modified only by each individual, when he/she becomes aware, via elements and evidence, that new postures would be better to deal with the world around. In the present study data regarding the attitude of teachers towards information technology was gathered with the help of survey method. All the school teachers of districts Bilaspur and Hamirpur of Himachal Pradesh constituted the population of the study. In order to ensure high quality of research, selection of a good sample is must. For this purpose sampling was done at two stages. At the first stage 14 schools were selected and in the second stage 150 teachers were selected randomly from the each selected school. Keeping in view the nature of the present study the investigator used the standardized tool, “Attitude towards Information Technology Scales. The reliability of the tool is 0.88. To find out the significance of difference between the various groups ‘t’-test was applied. The findings of the study revealed that gender-wise, locality-wise, school teachers do not differed significantlyin their attitude towards information technology.

Optimizing the RSW Process Quality of Auto-Body via the Taguchi Method and a Neural-Genetic Approach

2010 ◽  
Vol 97-101 ◽  
pp. 3899-3904 ◽  
Author(s):  
Hsuan Liang Lin ◽  
Chang Pin Chou
Keyword(s):  
Shear Strength ◽  
Taguchi Method ◽  
Back Propagation ◽  
Integrated Approach ◽  
Welding Parameter ◽  
Tensile Shear Strength ◽  
Tensile Shear ◽  
Second Stage ◽  
Two Stages

This paper applies an integrated approach using the Taguchi method, neural network (NN) and genetic algorithm (GA) to optimize the tensile-shear strength of resistance spot welding (RSW) specimens in automotive industry. The proposed approach consists of two stages. First stage executes initial optimization via Taguchi method to construct a database for the NN. In second stage, a NN with Levenberg-Marquardt back-propagation (LMBP) algorithm is used to provide the nonlinear relationship between factors and the response. Then, a GA is applied to obtain the optimal factor settings. The experimental results showed that the tensile-shear strength of the optimal welding parameter via the proposed approach is better than apply Taguchi method only.

scholarly journals A new concept in minimally invasive embryo transfer

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Jarosław Wieczorek ◽  
Ewa Stodolak-Zych ◽  
Krzysztof Okoń ◽  
Jurij Kosejuk ◽  
Magdalena Bryła ◽  
...  
Keyword(s):  
Embryo Transfer ◽  
Material Properties ◽  
Histopathological Examination ◽  
Second Stage ◽  
Embryo Cultures ◽  
Low Efficiency ◽  
Two Stages ◽  
New Generation

AbstractConsiderable variation in embryo transfer (ET) catheter types, diverging opinions on their quality and functionality, complications following the insertion of catheters, low efficiency of the application of ET methods in humans, and their widely varying efficiency in animals demonstrate the need to improve ET methods and to look for new types of catheters. Such an opportunity is offered by the introduction of catheters made of new-generation biomaterials. This study was aimed to introduce a new generation of biomaterials into reproductive biotechnology. New-generation materials were compared with materials that have been used for many years, and the functionality of newly produced catheters was compared in vivo. Five types of biomaterials were tested: polycaprolactone (PCL), dibutyryl chitin (DBC), polypropylene (PP), polyethylene (PE) and polylactide (PLA). The study was carried out in two stages. Firstly, the basic utility parameters such as geometric stability, surface structure and catheter resistance were evaluated. Subsequently, the biocompatibility of selected biomaterials in embryo cultures was examined, and the development potential of the obtained blastocysts was evaluated. In the second stage, in in vivo with live animals, the biomaterials were tested for biocompatibility and the obtained catheters were examined for their ET functionality. Efficiency with the use of the newly produced catheters was determined, the quality of the blastocysts obtained after embryo culture in the uterus was assessed, and oviducts were subjected to histopathological examination after embryo transfer. Of the tested biomaterials, only polyethylene (PE) showed adequate biological and material properties and proved suitable for production of ET catheters.

scholarly journals SAÚDE MENTAL E TRABALHO: a realidade dos trabalhadores do SUAS

2021 ◽  
Vol 7 (2) ◽  
pp. 181-194
Author(s):  
Tassiana Algarte Fernandes ◽  
Regina Celia de Souza Beretta
Keyword(s):  
Social Assistance ◽  
Daily Practice ◽  
Well Being ◽  
Physical And Mental Health ◽  
Online Questionnaire ◽  
Political Issues ◽  
Second Stage ◽  
The Family ◽  
Two Stages

The Unified Social Assistance System (SUAS) emerges through the National Social Assistance Policy (PNAS) and establishes actions aimed at the population served, but also at the services and their physical, professional and management structure. And it is in this contrast between PNAS and reality, that working conditions emerge as a negative point in the daily practice of SUAS workers and the existing physical and mental illness. The study described here, sought to understand the work relationships and how it affects the SUAS worker's life, about physical and mental health, well-being, and the quality of life of the professional and his family, since the illness and stress have a direct impact on the family group. The survey was integrated by SUAS professionals who work in the State of São Paulo, and was developed in two stages, the first of which was through an online questionnaire, with 24 questions (assertive and essay) and was answered by 189 workers. The second stage included two focus groups, with the participation of 24 professionals, who were selected from among those who had answered the first part of the study. The results obtained pointed to the existence of several factors that interfere in the quality of work, such as lack of structure, reduced staff, management failures, political issues, hierarchical relationships, and overload that directly affect the health of these professionals, demanding greater attention to the health of the worker.

scholarly journals Influence of vitamins C and E on the quality of cryopreserved semen Prochilodus brevis (Prochilodontidae, Teleostei)

2017 ◽  
Vol 38 (4Supl1) ◽  
pp. 2669
Author(s):  
Priscila Silva de Almeida-Monteiro ◽  
Mayara Setúbal Oliveira Araújo ◽  
Romulo Roberto Ribeiro Pinheiro ◽  
Júlia Trugilio Lopes ◽  
Yasmim Maia Ferreira ◽  
...  
Keyword(s):  
Vitamin E ◽  
Vitamin C ◽  
Deleterious Effect ◽  
Membrane Integrity ◽  
Sperm Cells ◽  
Second Stage ◽  
Sperm Membrane ◽  
Two Stages

Seminal cryopreservation allows the long-term conservation of gametes of various species, including endangered species, such as Prochilodus brevis. However, the application of this biotechnology can cause damage to sperm cells, reducing seminal quality. Thus, we have sought substances that minimize the damage caused by this process, such as antioxidants. Thus, this study aimed to evaluate the association between two cryoprotectants and two vitamins, in different concentrations, on the quality of cryopreserved semen of P. brevis. For cryopreservation, the experiment was performed in two stages. In the first stage, the semen of 10 animals was submitted to six different freezing means, coming from the combination of 5% glucose, two cryoprotectants (Dimethyl sulfoxide [DMSO] or Methyl glycol) and two vitamins (C or E to 0.0001 mg) for cryopreservation. In the second stage, semen samples of eight animals were diluted in 5% glucose and the best cryoprotectant found in the first stage, associated with three different concentrations of vitamins C or E (0.01, 0.001, and 0.0001 mg). In both steps, the in natura and post-thawed samples were submitted to kinetic analysis, morphology, and sperm membrane integrity. The cryopreserved semen with DMSO presented significantly higher results (p < 0.05) than that frozen with Methyl glycol, regardless of the vitamin used. The morphologically normal spermatozoa rate was higher (p < 0.05) in the vitamin-containing samples, however, vitamin E reduced sperm motility rates, independent of the cryoprotectant used. As for vitamin concentrations, higher motility rates were obtained when cryopreserved semen with 0.01 and 0.0001 mg of any of the vitamins. However, the higher concentration had a deleterious effect on the spermatic morphology of P. brevis. Therefore, the glucose associated with DMSO and the lower concentration of vitamin C provides good quality for the post-thawed semen of P. brevis.

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