• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2005.05a
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• pp.966-970
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• 2005

On the basis of the development of KSLV-1, KoDSat was designed and manufactured to demonstrate the performance of KSLV-1. KoDSat is exposed to a severe vibrational environment at launch. The structural reliability of KoDSat has to be verified using vibrational test. The structural compatibility and verification of components between analysis and test can be proved using environmental vibration test. In this paper, we review the structural characteristic of thruster control unit for a space launch vehicle and design TCU housing using mathematical model. In order to verify the structural compatibility and reliability, half-sine shock, random and sing sweep vibration test was performed. Especially, sing sweep vibration test result is compared with analysis result and mathematical model is verified.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.11a
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• pp.365-368
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• 2004

This paper describes a MATLAB based SDM software embodied in a GUI environment (SDMTool), which is a technical high-end tool for structural dynamics modification (SDM) problems. The software is composed of four modules: 1) FE model linker module; 2) FE model updating module; 3) SDM forward problem module; 4) SDM structural optimization module. The software can be useful to engineers performing researches on structural dynamics modification and FE model updating.

• Journal of Astronomy and Space Sciences
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• v.40 no.4
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• pp.225-235
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• 2023

This paper presents the structural design of a planar synthetic aperture radar (SAR) antenna applied to a microsatellite. For micro-satellite applications, the SAR antenna structure must be lightweight, flat, and designed to withstand the launch environment. To satisfy these conditions, our novel antenna structure was designed using aluminium (AL) alloy. Structural analysis was performed for quasi-static load, random vibration, and shock load to verify its robustness in the launch environment, and the results are presented here.

• Journal of the Korea Safety Management & Science
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• v.11 no.2
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• pp.223-233
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• 2009

This study was aimed at analyzing the structural relationship among such factors as industrial environment, technological cooperation, technological innovation performance and management performance that are essential to technological innovation of small and medium-sized companies. For this aim, an analysis was conducted to determine which of the factors in industrial environment has impact on technological cooperation of small and medium-sized companies. An empirical analysis was also performance to find what kind of effects the technological cooperation may have on technological innovation and management performance. From the analyses, it became known that: first, changes in industrial environment have influence on technical cooperation factors including production technology, technical information, technical manpower and fund for technology that are assorted by means of factorial analysis; second, the technological cooperation of small and medium-sized companies has impact on their technological innovation performance; and third, the technological cooperation of small and medium-sized companies has impact on management performance.

• The Korean Journal of Health Service Management
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• v.11 no.2
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• pp.43-53
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• 2017

Objectives : This study aimed to investigate the effects of resonant leadership and structural empowerment on the job satisfaction of registered nurses working in hospitals. Methods : Data were surveyed from 307 nurses in three general hospitals in Seoul and Gyeonggi-do using self-administered questionnaires from March 15 to 31, 2016. We conducted t-test, ANOVA, Pearson's correlation analysis, and multiple regression analysis using SPSS 21.0 for analysis. Results : Resonant leadership and structural empowerment had significant effect on the job satisfaction of nurses. These two attributes of a quality work environment explained 45.3% and 40.1% of the variance in organizational and opportunity satisfaction while controlling for age, marital status, religion, education, work department, work type, career and work position. Conclusions : The findings of this study suggest that resonant leaders and structural empowerments contribute to nurse job satisfaction. Therefore, developing resonant leadership skills and structural empowerment among nurse leaders in hospitals will ensure the creation of healthy work environments that promote job satisfaction and retention of nurses.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.33 no.11
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• pp.95-105
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• 2005

The HAUSAT-2 nanosatellite which is scheduled to launch in 2008 is being developed by SSRL(Space System Research Lab.). The HAUSAT-2 STM(Structural-Thermal Model) was developed as the first system model to verify structural and thermal design margin. The qualification level vibration and thermal tests have been conducted on STM. This paper addresses the comparison of structural analysis and test results of HAUSAT-2 STM. It was shown that the natural frequency of HAUSAT-2 STM satisfies the stiffness requirements without structural damage in the random vibration test. The assembly and integration validity were also checked out through STM.

• Smart Structures and Systems
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• v.16 no.3
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• pp.521-535
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• 2015

Vibration-based monitoring is one approach used to perform structural condition assessment. By measuring structural response, such as displacement, dynamic characteristics of a structure may be estimated. Often, the primary dynamic responses in civil structures are below 5 Hz, making accurate low frequency measurement critical for successful dynamic characterization. In addition, static deflection measurements are useful for structural capacity and load rating assessments. This paper presents a DC coupled continuous wave radar to accurately detect both dynamic and static displacement. This low-cost radar sensor provides displacement measurements within a compact, wireless unit appropriate for a range of structural monitoring applications. The hardware components and operating mechanism of the radar are introduced and a series of laboratory experiments are presented to assess the performance characteristics of the radar. The laboratory and field experiments investigate the effect of factors such as target distance, motion amplitude, and motion frequency on the radar's measurement accuracy. The results demonstrate that the radar is capable of both static and dynamic displacement measurements with sub-millimeter accuracy, making it a promising technology for structural health monitoring.

• Journal of the Korean Society of Marine Environment & Safety
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• v.24 no.5
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• pp.604-610
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• 2018

Recently, due to the rapid growth of the leisure industry, demand for small-scale flotation and mooring pontoon platforms has been increasing rapidly. Standard rules for the design and structural safety of such structures have become necessary. This paper provides criteria that can be referenced when designing pontoon platforms, and also introduces structural safety evaluation procedures. In this study, the structural safety and stability of a 15-meter pontoon platform were investigated through structural design and finite element analysis. For platforms of less than 10 meters in length, a simple structural calculation can be used, but for platforms over 10 meters, a detailed structural strength review must be considered to meet safety guidelines defined in existing regulations. The structural strength of the initial design was examined and its structural safety was verified. For future research, it is an evaluative system was developed that can be used to examine the various loading conditions during design.

• Computational Structural Engineering
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• v.23 no.3
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• pp.87-96
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• 2010

• Journal of the Korean housing association
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• v.28 no.1
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• pp.19-26
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• 2017

The purpose of study developing Development evaluation methods of light environment for indoor of middle school based on 'Biophilia'. This study is mainly based on literary review and survey research. To construct structural questionnaire based on 'Light and Space' of Biophilic Design for well being lighting environmental evaluation. We construct structural questionnaire that have 10 evaluation factors and 60 detail evaluation items to evaluate lighting environment for indoor of middle school based on biophilia theory. To survey students' subjective evaluation, the participant of study has been selected with the total number of 232 middle school students. The data were analyzed using Multiple Regression Analysis by IBM SPSS statistics 21. The result of pearson correlation analysis between satisfaction of indoor light environment and school life satisfaction, satisfaction of the whole indoor light environment was found showing positive relationship with school life satisfaction. The results of light environmental evaluation were factor 3,6,8,9 was lower than others. This study was designed to suggesting an evaluation method of light environment of the school. Biophilia theory said when 10 evaluation factor are in harmony, light environment can be well-being. So, factor 3,6,8,9 that are important elements to increase the satisfaction of lighting environment are consider carefully for the plan of indoor lighting environment.