Journal of Technology and Social Science (JTSS, J. Tech. Soc. Sci.)
An international open-access peer-reviewed journal
TABLE OF CONTENTS
Gunma astronomical observatory and its international activities with south-east asian countries
Osamu Hashimoto, Hakim L. Malasan and Yoshihide Kozai
Journal of Technology and Social Science, Vol.2, No.1, pp.1-10, 2018.
Abstract: Gunma Astronomical Observatory (GAO) is a public observatory operated by the local government of Gunma prefecture. Its main telescope is a 150-cm reflector, which is not designed only for scientific research but for star gazing by public visitors, equipped with an eyepiece system in addition to powerful scientific measuring instruments. GAO has carried out a number of international activities with various countries. Many of them were cooperative works with South-East Asian countries. In 2002, a Memorandum of Agreement (MoA) between GAO and Institute of Technology Bandung (ITB), Indonesia was signed in which both institutions worked together in various fields of astronomical research and education for many years. It is a great honor of GAO that it could make some significant contributions to the establishment of the South-East Asia Astronomical Network (SEAAN), which leads the rapid development of Astronomy in the South-East Asian countries by their international collaborations for themselves.
Helping senior high school student to learn momentum and impulse by developing a learning material using the scratch programming language
Vina Serevina, Hadi Nasbey, Wawan Andriana
Journal of Technology and Social Science, Vol.2, No.1, pp.11-16, 2018.
Abstract: A software consists of an animation and a simulation of physics phenomenon which shown the linear momentum in the daily life experience has been developed. The software is developed for helping the student in the senior high school to learn a linear momentum. The software is developed using the Scratch (https://scratch.mit.edu) which is an open source software developed by MIT Media Lab. The ADDIE (Analysis, Design, Development, Implementation and Evaluation) model is used as a framework to developed the software. As a learning material, the software is validated by a competent people such as the researcher on educational physics and the high school teacher who teach physics. The mean score from the validator is approximately 8.6 from 10 for the software. Which mean the software is appropriate as a learning material for helping students to learn a linear momentum. The software was implemented for teaching the student at Bani Saleh high school Bekasi Indonesia. After pre-test and post-test resulted in the normalized gain value, G, approximately 0.53 which shows the performance of the software was help for increasing a comprehensive understanding in a student.
Hierarchical service for integrating multimodal public transport system in Palembang, Indonesia
Journal of Technology and Social Science, Vol.2, No.1, pp.17-23, 2018.
Abstract: Palembang, capital city of South Sumatera Province, is developing LRT system for public transport. Yet, the existing old bus, and BRT routes are not compatible with planned LRT route. The aims of this paper are to present the characteristics of multimodal public transport demand, and their potential of shifting from private car or motorcycles to LRT, and to plan the hierarchical service for integrating multimodal public transport system. Method of Analysis is descriptive Analysis, Cross tabulation, matrices analysis and multimodal analysis. The result of this study is (1) demand for multimodal transport is still low (21.66%), with 43.38% travel time is less and equal to 15 minutes and 38.18% travel time is between 16 to 30 minutes (2) the hierarchical services are LRT and BRT is a main modes which share the Road Sudirman in different level and get high speed, the feeder route is Old Buses and Oplets routes, which need to be replanned and readjusted in integrating multimodal public transport.
Propagation of stress waves in viscoelastic rods and plates
Ryuzo Horiguchi, Yoshiro Oda and Takao Yamaguchi
Journal of Technology and Social Science, Vol.2, No.1, pp.24-39, 2018.
Abstract: This paper focuses on the explicit analytical expression of the complex wave number of a longitudinal wave in a viscoelastic rod and a flexural wave in a viscoelastic beam. The proposed formulas for a longitudinal wave are applied to Sassofs experimental results for a split-Hopkinson pressure bar. The wave number and attenuation constant calculated by the proposed formulas agree well with the results of a generic three-parameter model. However, the proposed formulas are more general and can be applied to any viscoelastic model. Further, the formulas for the flexural wave are validated using the measured data of a free-free beam. Frequency response functions (FRFs), such as the mobility, are evaluated using the complex wave number calculated by the proposed formulas. The calculated mobility agrees with the measured results. In addition, the attenuation constant becomes maximal at a particular value of the loss factor. These values are and for the longitudinal and flexural waves, respectively.
Sound insulation analysis of automotive soundproof material using urethane and rubber
Yoshio Kurosawa, Tetsuya Ozaki, Naoyuki Nakaizumi
Journal of Technology and Social Science, Vol.2, No.1, pp.40-48, 2018.
Abstract: Enhancement is necessary in the acoustic insulation performance with respect to the high-frequency interior noise of automobiles. In this study, to improve the sound insulation in the overall acoustic insulation of a rubber sheet laminated to urethane, we used a waffle shape on the urethane surface and then examined the resulting acoustic change. We performed the test using a simple sound insulation performance measurement device and compared its results with the vibration sound analysis results obtained using a finite element model. We used the Biot model for the urethane using individually calculated parameters. In addition, with respect to the sound and vibration inputs, we calculated the sound performance changes resulting from differences in the waffle shape (rib width, rib interval). As a result, in a certain frequency band, we confirmed that the sound insulation performance had improved.
A Novel Tactile Sensor for Palpation of Breast Cancer
Feng Wang, Mai Sekikawa and Nobuaki Nakazawa
Journal of Technology and Social Science, Vol.2, No.1, pp.49-53, 2018.
Abstract: This paper reports the development of a novel tactile sensor evaluating tactile properties of biological soft tissues for the purpose of palpation of breast cancer. Both PVDF (Polyvinylidene difluoride) film and PSCR (pressure sensitive conductive rubber) are used as sensitive receptors in the sensor. The sensor is driven by a vibrator to apply an oscillatory stress to the object to be evaluated. Both time-domain and frequency-domain parameters of the sensor output are used for the evaluation of the tactile properties of the object. The sensor system was testified using a palpation model of breast cancer. Experimental results show that it is possible to discriminate pathological tissue from normal tissue using the sensor.
Impact force measurement of a plastic sheet using drop ball test by the Levitation Mass Method (LMM)
Yoshihiro Kawamura, Akihiro Takita and Yusaku Fujii
Journal of Technology and Social Science, Vol.2, No.1, pp.54-62, 2018.
Abstract: Drop ball test by the Levitation Mass Method (LMM) was carried out on a plastic sheet made of PMMA. Impact response of PMMA was measured with high accuracy and accurately evaluated. In this test, the velocity of the center of gravity of a metal spherical body is accurately measured using an optical interferometer. The acceleration, displacement, and inertial force of the spherical body are calculated from the velocity. In other words, the impact response of a plastic sheet is calculated from the velocity of a sphere dropped onto a plastic sheet. The uncertainty in this measurement is estimated to be 7.4 mN. This corresponds to 0.03% of the maximum force of approximately 27 N. However, the result has an uncertainly point which is a period to receive a constant impact force. Change of the boundary condition during the test is the components of an uncertainly point.
Qiong Wu and Xilu Zhao
Journal of Technology and Social Science, Vol.2, No.1, pp.63-71, 2018.
Abstract: This paper investigates the buffered tuned-mass damper (TMD) for an offshore structure. The purpose of this paper is to find an effective and economic means to reduce the wave induced vibrations of the offshore platform system. This paper proposes a bufferable TMD, a passive TMD with buffers on both sides, to improve the performance of offshore platforms subjected to large seismic waves. A comprehensive experiment was executed to investigate the dynamic performances of the bufferable TMD, by application of a 1:200-scale offshore platform prototype. It is verified that the bufferable TMD can be effective in absorbing the vibration energy. In conclusion, the experimental results indicate that the response of an offshore platform can be significantly decreased, and the evaluation indices show that the method is effective in reducing overall vibration levels and maximum peak values, with the application of the bufferable damper system.
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