bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of learning styles on prospective teachers’ self-regulated learning skills
Authors: Dincol Ozgur Sinem
Published: January 2019

The aim of this study was to determine the learning styles of prospective chemistry and science teachers, and to examine the effects of different learning styles on their self-regulated learning skills. The survey method which is one of the quantitative research methods was used in this study. A total of 251 prospective chemistry and science teachers from the Departments of Chemistry and Science Education of three different public universities participated in the study. The Self-Regulated Learning Skills Scale was used to determine the self-regulated learning skills of the prospective teachers, and the ‘Maggie McVay Lynch Learning Style Inventory’ was used to determine the prospective teachers’ learning styles. The results showed that 61.8% of prospective chemistry and science teachers had a visual learning style, followed by a moving or kinaesthetic learning style (19.9%) and an auditory learning style (18.3%). Furthermore, a statistically significant difference was determined in the prospective chemistry and science teachers’ lack of self-directedness scores.
Keywords: Learning style, prospective chemistry and science teachers, self-regulated learning
Primary school students’ mathematics motivation and anxieties
Authors: Deringol Yasemin
Published: January 2019

Mathematics is necessary to enable children to gain the knowledge and skills required for daily life, it teaches them how to solve a problem, enables them to gain ways of thinking and prepares them for the future. The prejudice developed towards mathematics affects the students’ perceptions related to the mentioned course. The students’ low motivation and high anxiety concerning mathematics are among the most important problems encountered. This research was conducted with students in the third and fourth grades in primary schools in Istanbul province to examine their mathematics motivation and anxieties. It was concluded that students’ mathematics motivation was at a medium level and their mathematics anxieties were very low and there were no differences according to gender. Mathematics motivations among fourth grade students were higher than that of third grade students. It can be recommended that classroom teachers should prepare the environment in which they can introduce the entertaining world of mathematics to students.
Keywords: Primary school student, mathematics, mathematics motivation and mathematics anxiety
Relationship between nomophobia and fear of missing out among Turkish university students
Authors: Hamutoglu Nazire Burcin , Gezgin Deniz Mertkan , Sezen-Gultekin Gozde , Gemikonakli Orhan
Published: January 2019

The aim of this study is to investigate the relationship between no mobile phobia (nomophobia) which is defined as a modern fear of being unable to communicate through the mobile phone, and Fear of Missing Out (FOMO) which is known to be related with the problematic relationship with Social Networking Sites (SNSs), and play a critical role in the increased use of Social Networking Sites (SNS). The data were collected from a convenient sample of 538 university students via Nomophobia (NMP-Q) and FOMO Scales, The results show that a positive moderate level of relationship was found between Nomophobia and FOMO levels. The findings showed that FOMO level of university students predicts 41% of the total variance at the Nomophobia level. That is, when FOMO level increases, studentsâ€™ nomophobia level can be predicted from data depicting the increase.
Meta-analysis of school leadership effects on student achievement in USA and Turkey
Authors: Uysal Sengul , Sarıer Yılmaz
Published: January 2019

This research study aims to investigate the effects of school leadership on student achievement in USA and Turkey. The method of meta-analysis is used to calculate the effect size of school leadership on student achievement. Thirty-nine research studies were included in this study. However, several publications included in the research have examined more than one leadership approach. Due to this reason, the dataset used in 39 publications was determined as 68 in total. The results of the analyses performed with a random-effects model revealed that school leadership has a small but positive effect on student achievement in general. However, in Turkey, the effect size is at a modest level, while it is small in the USA. Considering the findings of the study, it can be proposed that professional development opportunities should be supported for the best practice of instructional leadership behaviours.

Keywords: Achievement, meta-analysis, school leadership, Turkey, USA
Examining self-regulation skills of elementary school students
Authors: Kizkapan Oktay , Bektas Oktay , Kirmizigul Asli Saylan
Published: January 2019

The purpose of this study is to determine elementary school students’ level of self-regulation skills—goal setting and to develop strategies to achieve these goals. Survey method is used in the study with the participants of 368 students. The study was conducted at two elementary schools in Incesu and Kocasinan provinces of Kayseri and students filled a five-item Likert type scale. Data were analysed using statistical analysis program and 0.05 significance level was accepted. The result shows that the average grade of girls was higher than the boys, the average of 5th grades was higher than 6th grades and the average of the school in the city centre was higher than the school in the rural area. Also, there was a significant difference between the self-regulation scores of the grade levels in the favour of 5th grades. Lastly, the self-regulation score of the students living in city centre was higher than that of students living in village.
Keywords: Self-regulation, elementary education, survey research, elementary students
Subjectivity functions in reflexive and intercultural process of linguistic development
Authors: Kondrateva Irina , Sabirova Diana , Plotnikova Nailya
Published: January 2019

The paper covers the issues of theoretical frameworks  that are being developing around subjectivity and the utility of subjective language in future spealistsâ€™ language learning. This draws from a wide range of philosophical and socio-psycological work on language acquisition and the role of reflexitivity as a vehicle for interculturality. The study reflects emperical analysis based on observation, interviewing, testing and pedagogical experiment. Using innovative ways of engaging subjectivity and reflexivity in teaching, learning and research led to designing a model for studentsâ€™ reflective and intercultural potential, which is a challenge in  reflexive and intercultural process of linguistic development in Higher school of foreign languages and translation studies.

 

Keywords: Linguistics, education, subjectivity, reflexivity, interculturality
Humour in the teaching of English and German equivocal words
Authors: Corbacho Sanchez Alfonso , Conejero Magro Luis Javier
Published: January 2019

This article proves statistically the effectiveness of humour in the teaching of English and German to Spanish students of foreign languages. The referred lexicon is particularly troublemaking because of the difficulties that such vocabulary poses for Spanish learners of not-Latin-originated languages. The approach followed is a quantitative and contrastive analysis and was carried out with four groups of Spanish learners. The experimental groups (one for each language) were presented with the input they were supposed to learn in sentences and contexts in which the use of the English/German term, with the meaning of its Spanish ‘false friend’, resulted in nonsensical and highly humorous utterances. The presentation of the same lexical items to the control groups was more neutral and deliberately bereft of humour. After that, the participants were set a test to find out whether or not they remembered the proper sense of the lexicon taught and could also use it correctly. The results are conclusive and the outcome strongly supports the beneficial effects of pedagogical humour in the language classroom.
Keywords: Humour, English as a foreign language, German as a foreign language, L2 resources, motivation, vocabulary development
Using wiki in the design of bilingual online course
Authors: Danilov Andrew V. , Zaripova Rinata R. , Anyameluhor Nnamdi
Published: January 2019

The aim of the study was to develop the web-based teaching course for use in the process of Information and communication technology learning by the Tatar-speaking students. The first-year students of Higher School of Tatar Philology and Intercultural Communication of Kazan Federal University took part in the experiment. They were divided into two groups. The experimental group consisted of 25 trainees and control group included 25 students. The educational experiment was carried out during one semester of the academic year 2015/16 and 2016/17. In teaching of the subject â€˜Computer Scienceâ€™ (36 hours), the technology CLIL K1 and Web 2.0-based training materials were used in the experimental group. Processing of the results with the help of statistical methods led to the conclusion that the positive changes in the experimental group were due to CLIL-assisted training, using teaching materials, developed on the basis of Web 2.0 technologies K1.

Keywords: Web 2.0, the Tatar language, the Russian language, adoptive language, learning content, wiki.
Comparative analysis of musical-enlightenment concepts of L. Bernstein and D. Kabalevsky in Russian music education
Authors: Mishina Anastasia V. , Yavgildina Zilia M. , Samigullina Rufina Ildarovna , Melnik Tamara Yu.
Published: January 2019

The aim of this study is to compare the activities of Kabalevsky and Bernsteinâ€”two musicians who made a significant contribution to the musical education of the younger generation, reveals the principles, methods, forms of educational work and covers the subject of television programmes. In particular, the pedagogical and musical-enlightenment concept of the outstanding composer, scientist Dmitry Kabalevsky was widely spread in our country. Also, the achievements of American composer, lecturer, teacher Leonard Bernstein in the field of musical enlightenment differ in originality and are rarely used in Russian musical pedagogical practice.  In accordance with the aim of the study, the following theoretical methods were used: analysis of the literature, epistolary texts, the repertoire of the concert programmes of the New York Philharmonic orchestra; generalisation of historical data on musical and educational activities of Kabalevsky and Bernstein, comparison of methods and techniques of music education, biographical method.

 

Keywords: Conversation, enlightenment, Dmitry Kabalevsky, Leonard Bernstein, TV
Problem-based learning in secondary school: Status and prospects
Authors: Abushkin Haris KH. , Kharitonova Anna A. , Khvastunov Nikolay N. , Gorshunov Maksim V.
Published: January 2019

Problem-based learning is one of the promising innovative technologies of the educational process in the school. This article presents the materials of research devoted to determining the rating and status of problem education in secondary school. Based on the analysis of the results of the conducted experiment, the main difficulties of teachers in the organization of problem education and the reasons for its low rating in secondary school are revealed. The developed recommendations are presented, the implementation of which, in our opinion, would improve the status of problem education in secondary educational institutions.

 KEYWORDS: problem learning, problem situation, educational problem, technology of problem learning, logical and heuristic thinking, creative thinking, lateral thinking.
Project technology in the development of communicative competence in schoolchildren: Extracurricular classes of Russian language
Authors: Nurullina Guzel M. , Muraviyov Alexandr F. , Martyanova Anastasiya A. , Yarmakeev Iskander E.
Published: January 2019

The article considers the project technology as a way of forming the communicative competence in students during extracurricular activities connected with the Russian language, the importance of this pedagogical technology in the organisation of teaching and educational work that allows the teacher to deepen the knowledge and skills of students obtained during the lesson. The project technology has a wide educational impact on the student in extracurricular activities connected with the Russian language: they reveal individual characteristics and abilities of students; enrich personal experience of students and their cognitive interest and develops the desire to be involved in a productive activity approved by society. The use of project technology in extracurricular classes allows the teacher to consolidate the knowledge of students in the vocabulary and phraseology of the Russian language, expand the vocabulary of students; promotes the development of their speech, logical thinking, improving the skills of expressive reading and the implementation of interdisciplinary communications.

Keywords: Project technology, communicative competence, Russian language, extracurricular activities, methods of language teaching
Special Issue on Advanced Cutting Science and Technologies
Authors: Matsumura Takashi
Published: January 2019

Cutting technologies have been widely applied in the manufacturing of airplane, automobile, medical, energy, and information industries. Cutting operations are generally evaluated in terms of material removal rates and surface quality. Materials science and engineering has also made significant progress in improving material properties. Therefore, scientific research should be conducted to achieve high performance when working with difficult-to-cut materials such as nickel-based super alloy. Because the manufacturing of products with complex shapes in various industries requires multi-axis machining, the cutting operations should be managed efficiently through controls, simulations, and monitoring.

This special issue was organized by Research Committee of Cutting Technologies in Japan Society for Precision Engineering. This issue includes 14 papers on advanced cutting technologies covering the following topics:

- Modeling the tribological aspects of the tool face–workpiece interface during the cutting process.

- Cutting mechanics in advanced cutting operations.

- Tool wear and coolant supply in cutting of advanced materials.

- Cutting processes for hard materials to improve cutting performance.

- Fixturing, chatter suppression, and tool path generation to control cutting processes and operations.

- Surface characterization and modeling to control product quality in multi-axis machining.

I hope this issue will be helpful for readers to understand cutting processes and improve the cutting operations.
Frictional Stress Derived on Interface Between Work and Tool Materials on Quasi-Dislocation Model for Cutting Simulations
Authors: Ihara Tohru ,   Department of Precision Mechanics, Faculty of Science and Engineering, Chuo University 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan, Song Xiaoqi , Takahashi Yukio
Published: January 2019

There growing demand for a new FEM cutting simulation method capable of dealing with the peculiar friction phenomena that occur on the interface between work and tool materials. In this report, we first seek a theoretical formula for quasi-dislocation motions as a model to explain the phenomena that occur on the interface between the work and tool materials by applying the dislocation theory. Next, we present our method for deriving the frictional stress on a tool face from quantum mechanical calculations based on the above-mentioned model. It uses the molecular orbital method, which can only conduct static calculations, to obtain the shear stress under high strain velocities. As one of its features, it does not use complicated experiments and the first-principle molecular dynamic calculations that is high costs.
Prediction of Built-Up Layer and Built-Up Edge Formation in Dry Cutting of SUS304 Stainless Steel
Authors: Song Xiaoqi ,   Department of Precision Mechanics, Chuo University 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan, Takahashi Yukio , Ihara Tohru
Published: January 2019

This paper presents a thermodynamic model for studying the energy dissipation processes such as friction, wear, and the adhesion phenomenon in order to predict the built-up layer (BUL) and built-up edge (BUE) formation conditions in dry cutting of SUS304 stainless steel. The model is composed of three parts: the extended representative contact model (RCM) at the tool and chip interface, the thermodynamic analysis within the RCM, and the growth model. At a typical region, the RCM is characterized by three material elements and two boundary elements, which support the contact conditions between two material elements. Thermodynamic analysis within the RCM reveals that apart from friction and wear, the BUL/BUE formation is also an irreversible energy dissipation process. The BUL/BUE can be called as a “dissipative structure substance,” which can reduce tool wear. Meanwhile, the RCM is an open system because it allows for the transfer of energy and matter with its surrounding. Energy exchange and mass exchange exert significant influences on the BUL/BUE growth. It is verified that the BUL/BUE growth depends significantly on four energy dissipation processes: workpiece fracture, friction, workpiece accumulation, and reduction of adhesion. In addition, the proposed model is verified by comparing simulations with the corresponding experimental results of dry cutting of SUS304 stainless steel. It is verified that the BUL/BUE develops its characteristics with cutting time and that the proposed model can accurately predict the BUL/BUE formation conditions. These results have provided a deeper understanding of the BUL/BUE formation mechanisms.
Side Milling of Helical End Mill Oscillated in Axial Direction with Ultrasonic Vibration
Authors: Iwabe Hiroyasu , Hiwatashi Mitunori , Jin Masahiko , Kanai Hidenari ,   Graduate School of Science and Technology, Niigata University 8050 Ikarashi 2-nocho, Nishi-ku, Niigata 950-2181, Japan,   Furukawa Magnet Wire Co., Ltd., Niigata, Japan,   Faculty of Fundamental Engineering, Nippon Institute of Technology, Saitama, Japan,   Industria Co., Ltd., Saitama, Japan
Published: January 2019

This paper is focused on the cutting performance in the side milling of a small-size end mill with vibrations generated by an ultrasonic vibration spindle apparatus in the axial direction with a helix edge. In side milling with ultrasonic vibration in the rotational direction, the mean value of the cross-sectional chip area per cutting time decreases owing to the frequent repetition of the cutting and non-cutting phases. As a result, the cutting force decreases and provides an optimal cutting performance as compared to that in conventional side milling. First, the cross-sectional chip area is calculated using three-dimensional computer aided design (CAD) with its mean value relative to the cutting time. The ultrasonic vibration spindle apparatus is then attached to the machine spindle, and cutting tests are performed for conventional and ultrasonic vibration machining. Next, the flank wear, surface roughness, cutting force, and residual stress are measured. The results obtained from the cutting tests of the two machining methods are compared. The main results are as follows: (1) A comparison of the flank wears of conventional machining and ultrasonic vibration machining shows that the former is larger than the latter. The maximum flank wear increases as the cutting length increases for both the machining methods. (2) The maximum height of the machined surface in ultrasonic vibration machining is larger than that in conventional machining because of the marks caused by ultrasonic vibration. (3) The mean cross-sectional chip area relative to the cutting time decreases with ultrasonic vibration machining and the tool deformation decreases with a decrease in the mean cutting force relative to the cutting time. (4) With ultrasonic vibration machining, residual stress is generated on the machined surface not only in the feed direction but also in the axial direction because of the repetitive sliding actions in the axial direction of the flank of the cutting edge.
Tool Wear Reduction Effect of Oil-Immersion Treatment and its Surface Modification Mechanism
Authors: Sakai Katsuhiko , Shizuka Hiroo , Iwakura Kazumasa ,   Shizuoka University 3-5-1 Johoku, Naka-ku, Hamamatsu, Shizuoka 432-8561, Japan,   Mitsubishi Materials Corporation, Gifu, Japan
Published: January 2019

This study describes a new surface treatment method that involves immersing sintered cutting tools into a high-pressure, high-temperature processing liquid. Cutting experiments were performed, and the results show that oil-immersion treatment helps reduce tool wear. However, this treatment limits the applications of treated carbide tools, e.g., they become unsuitable for heavy-cutting conditions. After the cutting test, surface analyses of the treated carbide tools were performed using FT-IR, SEM, EPMA, and XPS to verify the effect of oil-immersion treatment on tool-wear reduction. FT-IR analysis showed that, following oil-immersion treatment, trace quantities of the coolant remained on the tool surface, which could be readily removed by ultrasonic cleaning. Despite the removal of the processing liquid, the tool subjected to oil immersion exhibited less wear than the non-treated tool. SEM and EPMA examinations revealed that oil-immersion treatment reduced the amount of cobalt on the tool surface, forming sulfur deposits. EPMA analysis indicated that less cobalt binder was found on the surface after oil-immersion treatment, suggesting that the reduction in the amount of cobalt caused tungsten carbide particles to be exposed.
Deposition of Trace Coolant Elements on Flank Face in Turning of mboxInconel 718 Under High Pressure Conditions
Authors: Obikawa Toshiyuki , Fang Zhenglong , Matsumoto Wataru , Hayashi Mamoru , Hattori Hideaki , Morigo Chikara ,   Tokyo Denki University 5 Senju Asahi-cho, Adachi-ku, Tokyo 120-8551, Japan,   The University of Tokyo, Tokyo, Japan,   Idemitsu Kosan Co., Ltd., Ichihara, Japan,   Tokupi Co., Ltd., Yao, Japan
Published: January 2019

In this study, the coolant element deposition on the flank face of a coated tool in the turning of Inconel 718 when the coolant jet was supplied from the tool flank side at coolant pressures from 1 to 20 MPa was investigated. The flank wear-land was inspected after the cutting experiments using energy dispersive X-ray spectroscopy analysis to obtain the mappings of chemical elements contained in the workpiece, coating material, and coolant. It was found that coolant jet with pressures higher than 5 MPa extended the tool life dramatically compared to flood cooling. In contrast, increasing the coolant pressure beyond 5 MPa yielded only marginal improvements of the tool life, as has been reported previously for very high coolant pressures. Trace chemical elements contained in the coolant were mainly detected along the border of the tool-work contact area. The amounts of materials deposited had a complicated relationship with the pressure, and a large amount of sodium, silicon, calcium, and phosphorus deposited at very high coolant pressures of 10 and 20 MPa. It was concluded that the saturation of tool life extension at higher coolant pressures was ascribed to the thick deposited layer of a mixture of compounds, such as calcium phosphate and sodium silicide, along the border, which prevented the high-pressure coolant from penetrating into the tool/work contact area.
Cutting Performance of Coated Cemented Carbide Tool in Driven Rotary Cutting of Hardened Steel
Authors: Kato Hideharu , Takase Noriyuki , Watanabe Kentaro , Shikimura Tatsuya , Kubota Kazuyuki ,   Kanazawa Institute of Technology 3-1 Yatsukaho, Hakusan, Ishikawa 924-0838, Japan,   Yokowo Co., Ltd., Tomioka, Japan,   Toshiba Machine Co., Ltd., Numazu, Japan,   Takamatsu Machinery Co., Ltd., Hakusan, Japan,   Mitsubishi Hitachi Tool Engineering, Ltd., Yasu, Japan
Published: January 2019

Recently, cutting has replaced grinding in the finishing process for hardened steel. However, tool damage is a major problem in high-efficiency operations that use high-speed cutting and high-feed rate conditions rather than more conventional cutting conditions. Therefore, a new cutting technique that can realize high-efficiency cutting is desired. In our previous study, the processing efficiency was improved three to five times compared with conventional hardened steel cutting by driven rotary cutting. Furthermore, to attain high efficiency, the resistance of the tool material to wear and oxidation must be improved. In this study, the cutting performance of tools with an Al-rich coating, which improves oxidation resistance, is investigated for high cutting speed applications. In the present experiments, the flank wear of the Al-rich tool was less than 40 μm at a high cutting speed of 2.51 m/s, even for a cutting length of 10.0 km. Additionally, the Al-rich tool wear advanced progressively without flaking. In contrast, the conventional TiAlN-coated tools exhibited serious failure at cutting lengths of 3.0 km. It is thought that the difference in the oxidation resistance of the two tools influenced the cutting performance. Therefore, the tool with the Al-rich coating can operate with a high efficiency even at high cutting speeds.
Cutting Characteristics of Direct Milling of Cemented Tungsten Carbides Using Diamond-Coated Carbide End Mills with Untreated and Treated Cutting Edge
Authors: Okada Masato , Suzuki Reiji , Watanabe Hidehito , Otsu Masaaki , Miura Takuya ,   Faculty of Engineering, University of Fukui 3-9-1 Bunkyo, Fukui-City, Fukui 910-8507, Japan,   Graduate School of Engineering, University of Fukui, Fukui, Japan,   Tool Engineering Department, UNION TOOL Co., Mitsuke, Japan
Published: January 2019

This study investigates the cutting characteristics of direct milling of cemented tungsten carbides performed using a diamond-coated carbide end mill. The diamond-coated carbide end mills have cutting edges that are both treated and untreated, and the sharp cutting edge can be developed at the ridgeline of the diamond coating on the flank face via treatment of the cutting edge. Two types of cemented tungsten carbide were used as workpiece materials, i.e., TAS VM-40 and VC-70. The influence of the cutting length on the cutting characteristics was also studied. In the case of cutting of the VM-40, the cutting force of the treated tool was significantly lower than that of the untreated tool. The cutting forces of both tools were observed to be similar after the diamond coating on the rake face of the untreated tool was flaked. The cutting edge at the ridgeline of the diamond coating on the flank face of both tools was retreated during the cutting progress, and the thickness of the diamond coating of the untreated tool was also decreased. The finished surface integrity was drastically altered owing to the flaking of the diamond coating on the rake face of the untreated tool and the irregularity of the cutting edge of both tools. The accuracy of the machined shape obtained by using the treated tool was better than that obtained using the untreated tool, and the tendency was significantly observed as the cutting progressed. In the case of cutting of VC-70, flaking of the diamond coating of untreated tool did not occur, and the cutting force of the treated tool was significantly lower than that of the untreated one. The cutting edge of the treated tool was maintained sharp up to a groove length of 500 mm, although the workpiece material was clearly observed to be adhering to the round corner of the cutting edge of the untreated tool. Moreover, the accuracy of the shape of the machined groove obtained using the treated tool was better than that obtained using the untreated tool.
A Neural Network Based Process Planning System to Infer Tool Path Pattern for Complicated Surface Machining
Authors: Hashimoto Mayu ,   Tokyo University of Agriculture and Technology 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan, Nakamoto Keiichi
Published: January 2019

Die and mold are necessary for the manufacture of present industrial products. In recent years, the requirement of high quality and low cost machining of complicated surfaces has increased. However, it is difficult to generalize process planning that depends on skillful experts and decreases the efficiency of preparation in die and mold machining. To overcome an issue that is difficult to generalize, it is well known that neural networks may have the ability to infer a valid value based on past case data. Therefore, this study aims at developing a neural network based process planning system to infer the required process parameters for complicated surface machining by using past machining information. The result of the conducted case studies demonstrates that the developed process planning system is helpful for determining the tool path pattern for complicated surface machining according to the implicit machining knowhow.
Cutting Capability of Microdrills in Nonstep Drilling
Authors: Uchiyama Mitsuo , Sakata Naoshi ,   Department of Science and Engineering, Kanto Gakuin University 1-50-1 Mutsuurahigashi, Kanazawa-ku, Yokohama-shi, Kanagawa 236-8501, Japan,   Nissan Motor Co., Ltd., Yokosuka, Japan
Published: January 2019

There is a high demand for microdrilling processes to drill microholes with diameters equal to or less than 0.2 mm for use in fuel injection nozzles. In this study, nonstep drilling methods are developed for high-efficiency processing. Herein, the effects of the cutting oil supply method and the drill’s feed rate on the developed thrust force and torque during drilling are investigated. Accordingly, it is shown that drop supply of the cutting oil is the optimal method for nonstep drilling because the oil is sucked into the microhole. Furthermore, a high-feed rate is preferred because it produces continuous chips.*

*This paper is a translation with revision of the paper: M. Uchiyama and N. Sakata, “Cutting capability of micro drills in non-step drilling 1st report: Optimization of cutting oil supply and drill feed,” J. of the Japan Society for Abrasive Technology, Vol.59, Issue 1, pp. 27-31, doi: 10.11420/jsat.59.27, 2015 (in Japanese).
Chatter Suppression in Parallel Turning Assisted with Tool Swing Motion Provided by Feed System
Authors: Yamato Shuntaro , Okuma Toshiki , Nakanishi Kenichi , Tachibana Junji , Suzuki Norikazu , Kakinuma Yasuhiro ,   Department of System Design Engineering, Keio University 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan,   Nakamura-Tome Precision Industry Co., Ltd., Hakusan, Japan,   Industrial Automation Business Company, OMRON Corporation, Tokyo, Japan,   Department of Mechanical Aerospace Engineering, Nagoya University, Nagoya, Japan
Published: January 2019

Parallel turning technology has been attracting attention as an important technology to enhance the productivity of multitasking machine tools. To maximize the productivity advantage of parallel turning, chatter avoidance or suppression is one of the most noteworthy concerns. In this study, a novel chatter suppression technique using tool swing motion is provided by a feed drive system. The optimal design methodology of the tool swing motion for effective chatter suppression is also introduced based on its analogy with the spindle speed variation technique under the shared-surface parallel turning and rigid-tool and flexible-workpiece assumptions. The proposed method was evaluated with regard to the chatter stabilizing performance and workpiece runout as compared to conventional equal pitch turning and unequal pitch turning for chatter suppression. As a result, the proposed tool swing parallel turning exhibited a high chatter stabilizing performance without eccentricity of the workpiece and enhanced surface quality, although particular swing marks were left on the machined surface.
Surface Profile Analysis in Milling with Structured Tool
Authors: Uchiyama Fumihiro , Tsuboi Akihiko , Matsumura Takashi ,   Uchiyama Hamono Co., Ltd. 3-8-1 Ryoke, Naka-ku, Hamamatsu, Shizuoka 430-0852, Japan,   The Graduate School for the Creation of New Photonics Industries, Hamamatsu, Japan,   Tokyo Denki University, Tokyo, Japan
Published: January 2019

Novel end mills with micro-scale structures have recently been developed to promote cutting performances with cutting forces, chip controls, and tool wears. However, the surface profiles are formed corresponding to the structures on the tool edges. The surface finishes, therefore, are worse than those of cuttings with straight edges of the end mills. This paper discusses surface profiles in milling with the structured tool and the cutter axis inclination. An analytical model is presented to simulate the surface profiles for the tool edge shape, the cutting parameters and the cutter axis inclination. Because the surface profiles are controlled in the simulation, the optimum cutting parameters are determined to reduce the surface roughness. Micro-scale nicks were fabricated on polycrystalline diamond edges with a laser machine tool. The sizes and pitches of the nicks were controlled by the laser processing parameters. The cutting tests were conducted to measure the surface profiles. The presented surface profile model was validated by comparing the simulated and the measured surface roughnesses. The surface finish can be improved in milling with the cutter axis inclination in the optimum cutting parameters.
Fabrication of Hyper-Hemisphere of Cobalt-Chromium Alloys Using Curve Generator Machining
Authors: Tamura Shoichi ,   Department of Mechanical Engineering, Tokyo Denki University 5 Senju Asahi-cho, Adachi-ku, Tokyo 120-8551, Japan, Matsumura Takashi
Published: January 2019

High-precision machining is required for manufacturing hyper-hemispherical artificial joints made of difficult-to-cut metals such as cobalt-chromium (Co-Cr) alloys to provide wear resistance in the human body. The hyper-hemisphere of Co-Cr alloys is finished by curve generator machining, in which the rotation axes of the cutter and workpiece intersect each other at the center of the sphere to be machined. This paper presents a kinematic model to simulate the shape and surface topography on hyper-hemispheres with the cutter loci in curve generator machining. The kinematic model was validated with a cutting test, in which the surface profiles were measured around the pole and equator of the sphere. Simulations were performed to study the cutting process and surface finish. The appropriate cutting parameters were determined to improve the surface finish based on a kinematic simulation. A smooth surface was obtained when small inclinations of the workpiece, large nose radii of the cutter, low workpiece rotation speeds, and non-integer ratios of the tool spindle speed to the workpiece rotation speed were employed. The effects of the setting errors, such as the mounting error of the cutter and alignment error of the spindle and workpiece axes, were estimated via the kinematic simulation. It was found that the surface topography and radius of the sphere depended on the setting errors. The radius and center of the spherical shape were different from those of an ideal sphere by an error in the X-axis in the global coordinate system. The oval shape was caused by an error in the Y-axis. An error in the Z-axis affected the radius of the machined sphere.
Study of a Plateau Surface Evaluation Method Using a Fast M-Estimation Type Hough Transform
Authors: Yoshida Ichiro , Kondo Yuki , Wakatsuki Go , Numada Munetoshi ,   Hosei University 3-7-2 Kajinocho, Koganei-shi, Tokyo 184-8584, Japan,   Chukyo University, Nagoya, Japan
Published: January 2019

A surface with stratified functional properties (hereafter, referred to as the “plateau surface”) improves the tribological characteristics of sliding surfaces in machine tools, automobile parts, engines, etc. The evaluation methods of the plateau surface are listed in the ISO 13565 standard. However, since the evaluation methods listed in ISO 13565-3 are associated with several problems, these evaluation methods have been rarely used in production management. A plateau surface evaluation method that applied image recognition technology was developed in previous research studies to solve these problems. However, this method is time consuming with a calculation time of approximately 20 s. Therefore, in this research, we developed a new plateau surface evaluation method that applied the fast M-estimation type Hough transformation to achieve a computational time of a few seconds. It is expected that this method will be used in mass production processes.
Monitoring of Cutting State in End-Milling Based on Measurement of Tool Behavior Using CCD Image
Authors: Yoshimitsu Shinichi ,   National Institute of Technology, Kagoshima College 1460-1 Shinko, Hayato-cho, Kirishima-shi, Kagoshima 899-5193, Japan, Iwashita Daiki , Shimana Kenji , Kobaru Yuya , Yamashita Shunichi
Published: January 2019

To date, various in-process monitoring and measuring techniques for milling have been proposed; these are based on factors such as spindle power, cutting force, and vibration. However, the spindle power and cutting force in small-diameter milling processes are too small, thereby rendering these methods ineffective. This study aims to develop an in-process monitoring system of the cutting state, and thus, prevent tool breakage in milling when using a small-diameter tool. Our previous study showed that this monitoring technique is based on the analysis of the tool projection image by a CCD camera. It enables a precise measurement of tool deflection during high-speed milling. In this study, we apply this system to the measurement of tool deflection in end milling under different cutting conditions, including tool type, machining shape, workpiece, and feed rate. Moreover, we examine the relationship between tool deflection and cutting conditions. The results clarify that this system enables in-process monitoring of tool deflection. The measured tool deflection with this system is influenced by the cutting condition. In addition, the tool deflection shows a periodical change in one turn, which seems to be related to the number of tool edges.
Numerical Model of Digital Valve-Controlled Active Air Bearing
Authors: Maffiodo Daniela ,   Department of Mechanical and Aerospace Engineering (DIMEAS), Politecnico di Torino Corso Duca degli Abruzzi 24, 10129 Torino, Italy, Colombo Federico , Raparelli Terenziano
Published: January 2019

An active air thrust bearing controlled by an Arduino board and digital valves is described. A numerical model for the complete system is developed to design the control and perform a sensitivity analysis based on geometric parameters such as the conductance of the valves. Model validation is based on experimental open-loop and closed-loop tests. The purpose of the model is to determine the range of force and air gap height in which the pad can be controlled.
Does Leadership Impact on Performance of Agriculture and Food Service?
Authors: Kinanti Fitriana Windi , Sudiarditha I Ketut R , Kasmir Kasmir
Published: January 2019

This study aims to determine the effect of leadership, self-efficacy, and motivation on the performance of Wonogiri District Agriculture and Food Service employees. This study uses a quantitative approach. The object of this research is the performance of the Wonogiri District Agriculture and Food Service. Observation unit used 25 Agricultural Extension Centers. Determination of the sample using the cluster sampling method. The number of samples used was 218 samples. The method used is the survey method with questionnaires and interviews. The research design was descriptive, and the type of research used was explanatory research. Data analysis methods used include descriptive statistical analysis and parametric statistical analysis. The analysis technique uses Structural Equation Modeling (SEM). The results of the study showed leadership, self-efficacy and motivation had a positive effect on the performance of the Wonogiri District Agriculture and Food Service.
Program Pengembangan Minat Kewirausahaan Mahasiswa
Authors: Hariani Lilik Sri , Andayani Endah , Ain Nurul
Published: January 2019

The objective of developing entrepreneurship program to produce new entrepre-neurs.  The methods in this activity were training, workshops, and observations. The results of implementation program among others, a very good commitment of tenants have been carried out all activities, the amount of attendance of tenants for each activity were  100%, their activeness in each activity were good and the average activity in 78 %, the successful of program is good and the program success rate in 75 %. We hope all of the activities implementation of developing entrepreneurship program increase the tenants interesting in entrepreneurship. It is recommended for the team to assist tenant activities until they can be independent entrepreneurs.
Manajemen Pengelolaan Sampah Studi Kasus di Bank Sampah Tirtarona Tlogomas Kota Malang
Authors: Yulianti Yulianti , Huda Rofi'ul
Published: January 2019

ABSTRACT

BSM assists the Malang City Government in fostering, training and assisting the people of Malang City who are incorporated in BSM customers in 3R (Reuse, Reduse, Recycle) waste management from household sources. The BSM unit was established which was strengthened from the SK of the Central BSM in Malang, and not the personal owner or RT / RW. The issues that are prioritized in the PKM (community partnership program) activities are the target audience of economically unproductive community partners, namely the BST (Waste Bank Tirtarona) and BSM (Community Waste Bank) partners. The two partners whose initial existence was productive but which are still not optimal and have not been utilized according to the objectives of BSM.

The purpose of the community waste management partnership program in the kecamatan area. lowokwaru Malang City to optimize waste management productivity according to the purpose of the establishment of the Waste Bank organization in creating peace, and comfort in community life. Specific targets to be achieved empower RT / RW waste managers as partners of Malang City BSM in managing / managing waste independently. Starting from receiving garbage, sorting, administering, weighing, processing up to the reporting stage as a form of BSM organizational evaluation to be able to contribute to its environment. The method used is the dissemination of the benefits of BSM waste management, activating the BSM work program by inviting the management with training and mentoring activities, comparative studies, helping waste production equipment and assisting in the renovation of BSM buildings.

The results of the implementation of the community partnership program were found; 1). BSM Unit management model that is centralized, meaning that all activities are still based on the RT / RW chairman's instructions in the local environment. The Chairperson of BSM works on the recommendation of the chairman of the PKK RW driving team where the land is established by BSM. 2) the condition of the human resources of the majority BSM management from the age of 60 and above, thus influencing the performance in carrying out the BSM work program. 3). BSM community conditions are in urban areas whose activities are busy working, so that they often become obstacles for the organizers to carry out social activities.
Sosialisasi Kekompakan Tim Melalui Outbound pada Kelompok Sadar Wisata Desa Mojo Kabupaten Bojonegoro
Authors: Andajani Erna , Rahayu Siti , Prihatiningrum Andriani Eko
Published: January 2019

The socialization program for team cohesiveness was carried out at the Tourism Awareness Group (Pokdarwis) of Mojo Village. This Pokdarwis has just been formed and has a role in managing boat tours and star fruit plantation tourism owned by Mojo Village. Boat tours and star fruit gardens are the mainstay of Mojo Village. The socialization for team cohesiveness was carried out with 33 people targeting the entire Pokdarwis group. Outbound activities are carried out indoors and outdoors for one full day. The purpose of outbound activities is to build the work of the Pokdarwis team as a whole and foster motivation among Pokdarwis members. The success of the socialization program was seen from the enthusiasm of Pokdarwis during outbound and through filling out questionnaires from members of Pokdarwis. Pokdarwis members have internal motivation that is better than external motivation. Internal motivation leads to self-motivation of Pokdarwis members, while external motivation refers to factors outside oneself. The results of data processing indicate that Pokdarwis Mojo also has good team cohesiveness. Compact teamwork and strong self motivation are very much needed by Pokdarwis in developing tourism in Mojo Village.
Akuntabilitas Sistem Informasi Manajemen Kearsipan dan E-Dokumen
Authors: Noor Aris Setia , . Jarkawi , Muttaqin Riadhul
Published: January 2019

Archival accountability as a public service in meeting stakeholders and study material for managers in making decisions. Archival activities and e-documents on an agency is a sub-system of a government system that is constantly changing and developing so that changes and developments affect the institution as a sub-system where the sub-systems interact between sub-systems in the system itself. In the future, archives and e-documents will use an electronic system because it is very effective and efficient, critical, outcomes in an activity a manager takes a decision and policy. The problem still uses a lot of document archiving manually so that it takes a long time to find archives that have an impact on activities to be less effective and less efficient. The purpose of providing electronic skills competencies in e-documents. The form of activities carried out in the form of training and workshop management system for e-documents. The benefits of this activity provide a competence in knowledge and skills in managing archives through electronic (e-documents) so that organizational activities become effective efficiently productive and outcomes. Target audiences are kindergarten and paud teachers located in Mandastana sub-district, Barito Kuala district. Implementation Method. Training and Workshop, Discussion and Questions and Answers. Results Training and workshop participants get new insights and skills in e-documents

Akuntabilitas kearsipan sebagai pelayanan publik dalam memenuhi stakeholder dan bahan kajian bagi manejer dalam mengambil keputusan. Kegiatan kearsipan dan e-dokumen pada suatu instansi merupakan sub sistem dari suatu sistem pemerintahan yang terus berubah dan berkembang sehingga perubahan dan perkembangan tersebut mempengahui isntansi sebagai sub sistem dimana sub sistem saling berinteraksi antar sub sistem dalam suatu sistem itu sendiri. Kedepannya kearsipan dan e-dokumen akan menggunakan sistem eletronik karena sangat efektif dan efisien, kriatif, outcome dalam suatu aktivitas seorang manejer mengambil suatu keputusan dan kebijakan. Permasalahan masih banyak menggunakan kearsipan dokumen dengan manual sehingga memakan waktu lama dalam mencari arsip yang berdampak terhadap kegiatan menjadi kurang efekti dan kurang efisien.  Tujuan memberikan kompetensi ketrampilan elektronik dalam e-dokumen. Bentuk kegiatan yang dilakukan berupa pelatihan dan workshop manajemen sistem kearsipan e-dokumen.Manfaat kegiatan ini memberikan suatu kompetensi pengetahuan dan ketrampilan dalam pengelolaaan kearsipan melalaui elektronik (e-dokumen) agar kegiatan oragnisasi menjadi efektif efisien produktif dan outcome. Khalayak sasaran adalah guru TK dan Paud yang berada di kecamatan Mandastana Kabupaten Barito Kuala.  Metode Pelaksanaan. Pelatihan dan Workshop, Diskusi dan Tanya Jawab. Hasil Peserta pelatihan dan workshop mendapatkan wawasan dan ketrampilan baru dalam e-dokumen