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장성록 釜山工業大學校 1991 論文集 Vol.33 No.-
Muscular power and fatigue are directly related to safety of worker and productivity, especially in manual material handing (MMH) work. EMG (electromyograph) analysis is an engineering approach to represent the muscular power and fatigue. This paper aimed to develop an on-line experiment and analysis method to abstract muscles recruited and to conjecture a threshold level of exertion of each muscle in human movement. To achieve this goal, a EMG multiplexor and data analysis packages were built.
Pulsed-Power System for Leachate Treatment Applications
장성록,류홍제,옥승복 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.4
This paper presents a water treatment system for leachate from sewage-filled ground that uses a pulsed-power modulator developed based on semiconductor switches in order to realize a long life, a high repetition rate, and a fast rising time. The specifications of the developed pulsed-power modulator are the pulsed output voltage, the output current, the pulse repetition rate (PRR), the pulse width, and an average output power of 60 kV_max, 300 A_max, 3000, 50 μs, and 15 kW, respectively. The pulsed-power water treatment system was introduced and analyzed using an equivalent electrical circuit model to optimize the output voltage waveform. The experimental results verify that the proposed water treatment system can be effectively used for industrial applications.
Design of High-efficiency Soft-switching Converters for High-power Microwave Generation
장성록,류홍제,김종수,Suk-Ho Ahn 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.61
In this paper, the design of three types of power supplies for 30 kW and 60 kW industrial magnetron drives, high voltage power supply, filament power supply and magnet power supply, are studied. The high voltage power supply was designed based on series resonant converter discontinuous conduction mode (DCM) to take advantage of a clean current source that can cover the nonlinear characteristic of a magnetron, such as a zener diode. The maximum output specification of a high voltage power supply is 42.5 kW for a 30 kW industrial magnetron drive. This can also be used for a 60 kW magnetron with a parallel operation of two power supplies. The design considerations and feasibility tests of a resonant converter for an industrial magnetron are given. Additionally, the design of two auxiliary power supplies (a filament power supply: 15 V, 120 A and a magnet power supply: 75V, 5A) is also provided. These were designed based on the series resonant converter continuous conduction mode (CCM), above resonance operation for higher efficiency. Finally, the developed power supplies were tested using both a 30 kW magnetron and a 60kW magnetron. The results prove the design procedure and reliability of the proposed scheme.
장성록,김용수,이관석,김유창,배동철 한국안전학회 2003 한국안전학회지 Vol.18 No.3
Recently, work-related musculoskeletal disorders(WMSDs) are one of major issues in occupational safety and health in Korea Main risk factors of WMSDs include manual handling of heavy weight loads, awkward posture, repetitive tasks, prolonged static muscle contraction, and so on. The number of injured workers has rapidly increased and the related regulation was amended to improve the work conditions and environments. And demands for workers' compensation and improvement of work conditions and environment to prevent WMSDs have increasingly been raised. This study focused on managerial system to prevent WMSDs. Literal survey and questionnaire survey were accomplished to propose a management system in Korea for preventing WMSDs.
L5/S1 에 걸리는 부하염력과 척추기립근 근전도의 상관관계 분석
장성록 한국산업안전학회 1995 한국안전학회지 Vol.10 No.4
This study was performed to investigate a relationship between a biomechanical analysis of compressive force at L5/Sl and electromyographic analysis of erector spinae muscle during lifting task. In the experiment, isometric contractions at 25, 50, 75, 100%MVC for short duration and sustained isometric contractions at 50%MVC were performed. For muscle recruitment patten and compressive force analysis, rectified EMG amplitudes analysis and computerized biomechanical analysis were used. To achieve data, angles of neck, shoulder, elbow, wrist, hip, knee, ankle and length of body segments were measured. Results shows that trends of initial EMG rectified amplitude were similar to those of biomechanical calculation value and for sustained isometric contraction at 50%MVC EMG rectified amplitude of erector spinae muscle after 40seconds was increased up to level of 75%MVC. Based on the results of this study, biomechanical analysis should be supplemented considering muscle fatigue, and it is also suggested that work-rest cycle critera and the evaluation of back-pain injuries should include muscle fatigue.