• Title/Summary/Keyword: Working Set

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Modeling the Calculation of Lateral Accelerations in Railway Vehicles as a Tool of Alignment Design

  • Nasarre, J.;Cuadrado, M.;Requejo, P.Gonzalez;Romo, E.;Zamorano, C.
    • International Journal of Railway
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    • v.2 no.3
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    • pp.118-123
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    • 2009
  • Railway track alignment Standards set a minimum lenght value for straight and circular alignments (art. 5.2.9.), in order to ensure passenger ride comfort in railway vehicles of which dynamic oscillations will thus have to be limited. The transitions between alignments can cause abrupt changes (usually called discontinuities or singular points of the alignment) of curvature, of rate of change of curvature or of rate of change of cant. A passenger is likely to experience effects due to the excitation of the elastic suspension of the vehicle which generates oscillations that are damped as the vehicle moves away from the singularity. The amplitude of these oscillations should be adequately attenuated by the damping of the suspension system within the interval between two successive singular points, especially to avoid resonances. Therefore minimum lengths between two successive singular points are stated in alignment standards. Nevertheless, these nonnative values can be overly conservative in some cases. As an alternative, track alignment designers could try to assess how much the excitation has been attenuated between two successive singular points and thus assess at which point a new singularity may be present without affecting ride comfort. Although such assessment can be made with commercial SW packages which simulate the dynamic behavior of a vehicle considered as a set of rigid bodies interconnected with elastic elements simulating the suspension systems (such as SIMPACK, ADAMS or VAMPIRE), a simplified and user-friendly computation method (based upon the analytical solution of differential equations governing the phenomenon) is made available in this paper to track design engineers, not always used to working with full dynamic models.

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A Study on the Actual Conditions and Usage of Korean Design Right (한국 주얼리 디자인권 실태 및 이용에 관한 연구)

  • Chang, Chin-hee;Ko, Seung-Geun
    • Journal of the Korea Convergence Society
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    • v.10 no.2
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    • pp.227-233
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    • 2019
  • In order to suggest the utilization measures suitable of the 4th industry and design right in the management of jewelry company and also applying it to Korean jewelry industry, Also, the current status of Korean jewelry industry and design right was researched. Based on the theoretical background, the hypotheses were set up. After conducting a survey on the 4th industry, design right, management mind, and management intention targeting jewelry industry workers focusing on the set-up hypotheses. In the results The job currently working for in the jewelry industry and the job desired in the future were the design with the highest ratio, so that the importance of design was high in Korean jewelry industry. Also, design was the first priority of management mind, important elements of jewelry industry management, and successful management strategy while technology showed a bit less importance than factors of marketing, capital, and personal connections.

A Study on the development of Explosion-proof type's the terminal box of the ventilator with the control of wind volume and operating time (풍량 및 운전시간 제어 방폭 배풍기 인버터 단자함 개발에 관한 연구)

  • Yoo, DongJoo
    • Journal of Convergence for Information Technology
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    • v.8 no.6
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    • pp.187-192
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    • 2018
  • This thesis is about the study of inverter terminal boxes in a explosion proof type exhaust fan that can control wind volume and operating time. In Korea, there is no ventilator to adjust the amount of wind and operating time when working in poor conditions. The purpose of the project is to create a explosion terminal box that can control the operating time and wind speed of a suitable explosion ventilator in hazardous environments. The two explosion-proof switches allow the operation time to be driven 1 hour, 3 hours and continuous time, and the speed of the induction motor rotation was set in 3 stages at 2000 rpm, 2600 rpm and 3000 rpm to control the volume. The tested motor used a half-horsepower barrier three-phase induction motor and a full-bridge inverter to set the desired flow rate and operating time.

According to the User's Device Selection Priority Automatic Algorithm (사용자 기기 선택에 따른 우선순위 자동 설정 알고리즘)

  • Jeong, Do-Hyeong;Choi, Hyung-Wook;Jang, Ki-Man;Jeong, Dae-Jin;Jung, Hoe-Kyung
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2016.10a
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    • pp.891-892
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    • 2016
  • Recent research has become a smart home for operating the joining operation of the relationships between the device progress. However, Existing systems, there is a problem that the efficiency of the work can be degrade by the interference occurs when the operation of the other device, and triggered if the device is operating. In this paper, we designed a priority automatically set algorithm according to a user selection device to solve this problem. The user selects the device used by the application and by comparing between devices, select whether or not to set the priority of the tasks in. This allows the user can configure the working environment of only the desired device, and less chance of interference from other devices that are not selected during the work in progress can expect a more efficient productivity.

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Assessment of MJO Simulation with Global Coupled Model 2 and 3.1 (Global Coupled 모델 2와 3.1의 MJO 모의성능 평가)

  • Moon, Ja-Yeon;Kim, Ki-Young;Cho, Jeong-A;Yang, Young-Min;Hyun, Yu-Kyung;Kim, Baek-Jo
    • Atmosphere
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    • v.32 no.3
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    • pp.235-246
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    • 2022
  • A large number of MJO skill metrics and process-oriented MJO simulation metrics have been developed by previous studies including the MJO Working Group and Task Force. To assess models' successes and shortcomings in the MJO simulation, a standardized set of diagnostics with the additional set of dynamics-oriented diagnostics are applied. The Global Coupled (GC) model developed for the operation of the climate prediction system is used with the comparison between the GC2 and GC3.1. Two GC models successfully capture three-dimensional dynamic and thermodynamic structure as well as coherent eastward propagation from the reference regions of the Indian Ocean and the western Pacific. The low-level moisture convergence (LLMC) ahead of the MJO deep convection, the low-level westerly and easterly associated with the coupled Rossby-Kelvin wave and the upper-level divergence are simulated successfully. The GC3.1 model simulates a better three-dimensional structure of MJO and thus reproduces more realistic eastward propagation. In GC2, the MJO convection following the LLMC near and east of the Maritime Continent is much weaker than observation and has an asymmetric distribution of both low and upper-level circulation anomalies. The common shortcomings of GC2 and GC3.1 are revealed in the shorter MJO periods and relatively weak LLMC as well as convective activity over the western Indian Ocean.

Comparative Analysis in Perception on Men's Fashion Using Big Data : Focused on Influence of COVID-19 (빅 데이터를 활용한 코로나19 이전과 이후의 남성 패션에 대한 인식 비교)

  • Kim, Do-Hyeon;Kim, Jeong-Mee
    • Journal of the Korea Fashion and Costume Design Association
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    • v.24 no.3
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    • pp.1-15
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    • 2022
  • The purpose of this study is to compare and analyze the perception of men's fashion before and after the COVID-19 pandemic. TEXTOM allowed the collection of Big Data based on the term 'men's fashion'. As for the data collection periods, Jan. 1, 2018 to Dec. 31, 2019 was set as the pre-COVID-19 era, while Jan. 1, 2020 to Dec. 31, 2021 was set as the post-COVID-19 era. The top 50 words in terms of appearance frequency were extracted from the data. The extracted words were processed using network centrality analysis and CONCOR analysis using Ucinet 6. Research findings were as follows. 1) In the pre-COVID-19 era, the appearance frequency of 'men' was the highest, followed by 'fashion', 'men's fashion', 'brand', 'daily look', 'suit', and 'department store'. These words came up with a high TF-IDF values. Network centrality analysis discovered that 'men', 'fashion', 'men's fashion', 'brand', and 'suit' had a high level of connectivity with other words. CONCOR analysis showed four significant groups: 'fashion item and styles', 'fashion show', 'purchase', and 'collection'. 2) In the post-COVID-19 era, the appearance frequency of 'men' was the highest, followed by 'fashion', 'brand', 'men's fashion', 'discount', 'women', and 'luxury'. These words also displayed high TF-IDF values. Network centrality analysis found that 'fashion', 'men', 'brand', 'men's fashion', and 'discount' had a high level of connectivity with other words. CONCOR analysis showed four significant groups: 'fashion item and style', 'fashion show', 'purchase', and 'situation'. 3) Before the outbreak of the pandemic, men were interested in suits to wear to the office, daily look, and fashion shows in Milan and Paris. They often purchased menswear in multi-brand and open stores. However, they were more interested in sneakers, casual styles, and online fashion shows as social distancing and working from home became common. Most purchased menswear through online platforms.

Implementation of a Sensor to Detect the Foot-pushing Force for an Agricultural Transport-convenience Vehicle (농업용 이동편의장치를 위한 발로 미는 힘을 감지하는 센서 구현)

  • Seung-hee, Baek;Ik-hyun, Kwon;Cheong-worl, Kim
    • Journal of Sensor Science and Technology
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    • v.31 no.6
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    • pp.411-417
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    • 2022
  • In this paper, we propose a sensor with a C-shaped load cell to detect force change when a person sitting on the chair in an electrical transport-convenience vehicle is pushing ground by both heels. The load cell built in the vehicle is mechanically deformed by the vertical force owing to the human weight and the horizontal force by ground-pushing feet. The deformation rate of the load cell and its distribution are simulated using finite element analysis. In the simulation, the applied loads are preset in the range of 10 kg - 100 kg with a step size of 10 kg, and the ground-pushing force by feet is increased to 40 N with a step size of 5 N with respect to each applied load level. The resistance change of the load cell was observed to be linear in simulation as well as in measurement. the maximum difference between simulation and measurement was 0.89 % when the strain gauge constant was 2.243. The constant has a large influence on the difference. The proposed sensor was fabricated by connecting an instrument amplifier and a microcontroller to a load cell and used to detect the force by ground-pushing feet. To detect foot driving, the reference signal was set to 130% of the load, and the duration of the sensor output signal exceeding the reference signal was set to 0.6 s. In a test of a vehicle built with the proposed sensor, the footpushing force by the worker could be successfully detected even when the worker was working.

Key success factors for implementing modular integrated construction projects - A literature mining approach

  • Wuni, Ibrahim Yahaya;Shen, Geoffrey Qiping
    • International conference on construction engineering and project management
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    • 2020.12a
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    • pp.343-352
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    • 2020
  • Modular integrated construction (MiC) is an innovative construction method where components of a building are manufactured in an offsite factory, trucked to the job site in sections, set in place with cranes, and assembled together to form a whole building. Where circumstances merit, favorable conditions exist and implemented effectively; MiC improves project performance. However, several key factors need to converge during implementation to realize the full benefits of MiC. Thus, a thorough understanding of the factors which are critical to the success of MiC projects is imperative. Drawing on a systematic review of 47 empirical studies, this research identified 25 key success factors (KSFs) for MiC projects. Of these, the five topmost cited KSFs for MiC projects include effective working collaboration and communication among project participants; standardization, optimization, automation and benchmarking of best practices; effective supply chain management; early design freeze and completion; and efficient procurement method and contracting. The study further proposed a conceptual model of the KSFs, highlighting the interdependences of people, processes, and technology-related KSFs for the effective accomplishment of MiC projects. The set of KSFs is practically relevant as they constitute a checklist of items for management to address and deal with during the planning and execution of MiC projects. They also provide a useful basis for future empirical studies tailored towards measuring the performance and success of MiC projects. MiC project participants and stakeholders will find this research useful in reducing failure risks and achieving more desired performance outcomes. One potential impact of the study is that it may inform, guide, and improve the successful implementation of MiC projects in the construction industry. However, the rigor of the analysis and relative importance ranking of the KSFs were limited due to the absence of data.

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Integrated Network System of Milk Cow Stock-Farming Facilities for Stockbreeding Management (사양관리를 위한 젖소 목장 시설 통합 네트웍 시스템)

  • 김지홍;이수영;김용준;한병성;김동원
    • Journal of Animal Environmental Science
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    • v.8 no.3
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    • pp.199-208
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    • 2002
  • This paper introduces the method to make management network about milking cow farm tasks. The object of this research was to design of biological measuring system and managing network system in a livestock farm. This auto-management system provides informations about individual cows' temperature, conductivity of milk and weight for efficient management of feeding, and milking works by a micro-processor and RS -485 type serial COM. ports. And measured bio-data which are basic informations for remote raising management are saved to user PC by serial communication between the PLC and user PC. Milking cow farm is divided into three working place to each measurement work and feed. The first working place is milking station which has two thermometers, a conduct meter and a scale set. The second working place is feeding station, and the third place is cattle cage. These are combined by network system and the PLC which is used to drive network and sub-modules. Sub-modules have a micro-process to control the sensor and to interface with network. The PLC which drive network and control sequence has two serial communication port to be linked with user PC for sending the measured data and for receiving data. Above all, in this study tells the sequence operating method by the driving scenario of breeding milk cow for livestock auto-management using the PLC and network system.

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The Third Version of the Copenhagen Psychosocial Questionnaire

  • Burr, Hermann;Berthelsen, Hanne;Moncada, Salvador;Nubling, Matthias;Dupret, Emilie;Demiral, Yucel;Oudyk, John;Kristensen, Tage S.;Llorens, Clara;Navarro, Albert;Lincke, Hans-Joachim;Bocerean, Christine;Sahan, Ceyda;Smith, Peter;Pohrt, Anne
    • Safety and Health at Work
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    • v.10 no.4
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    • pp.482-503
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    • 2019
  • Introduction: A new third version of the Copenhagen Psychosocial Questionnaire (COPSOQ III) has been developed in response to trends in working life, theoretical concepts, and international experience. A key component of the COPSOQ III is a defined set of mandatory core items to be included in national short, middle, and long versions of the questionnaire. The aim of the present article is to present and test the reliability of the new international middle version of the COPSOQ III. Methods: The questionnaire was tested among 23,361 employees during 2016-2017 in Canada, Spain, France, Germany, Sweden, and Turkey. A total of 26 dimensions (measured through scales or single items) of the middle version and two from the long version were tested. Psychometric properties of the dimensions were assessed regarding reliability (Cronbach α), ceiling and floor effects (fractions with extreme answers), and distinctiveness (correlations with other dimensions). Results: Most international middle dimensions had satisfactory reliability in most countries, though some ceiling and floor effects were present. Dimensions with missing values were rare. Most dimensions had low to medium intercorrelations. Conclusions: The COPSOQ III offers reliable and distinct measures of a wide range of psychosocial dimensions of modern working life in different countries; although a few measures could be improved. Future testing should focus on validation of the COPSOQ items and dimensions using both qualitative and quantitative approaches. Such investigations would enhance the basis for recommendations using the COPSOQ III.