• Journal of Power System Engineering
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• v.22 no.1
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• pp.25-33
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• 2018

The safety of structure was evaluated by taking into consideration the complex marine environmental conditions of the Lattice boom crane, which is widely used in offshore plants due to less influence by wind. CFX analysis was carried out to take into account the influence of wind speed, and the result was applied as a boundary condition to perform static analysis according to the luffing angles of $28^{\circ}$, $61^{\circ}$, and $80^{\circ}$ in the on board and off board, respectively. In addition, the Lattice Boom Crane is large slender structure, and the possibility of buckling is interpreted under three conditions where the biggest stress occurs. All conditions satisfied the safety requirements of the Classification Regulations. Also, as a result of the buckling analysis, the load less than the critical load was applied so buckling does not occur.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.10a
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• pp.452-455
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• 2018

Wheel loader performs digging and dumping tasks using boom and bucket. The operation of the wheel loader equipment has a lot of repetitive tasks and the working environment is poor, but only by hand by man. Recently, demands for applying unmanned automated systems are increasing more and more in electrical components. For automated systems, accurate angle detection is indispensable for stable control. This paper proposes a signal processing system for precise angular control with noise robust features. As a result of implementing the proposed system and applying it to the wheel loader boom angle system, it was possible to detect an angle change of about 0.1 degree.

• Proceedings of the KSRS Conference
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• 2003.11a
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• pp.1009-1011
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• 2003

The procurement of mobile microwave scatterometer involve the consideration to ensure vehicle and equipment selection full-filled technical requirement and safety standard in Malaysia. Designing, and modification works involve engineering methodology in determining and selecting a suitable hydraulic telescopic boom that suit a selected vehicle available from the market. The vehicle is also a delivery system for microwave remote sensing equipment and other accessories to any locations in Malaysia. Total loading to be carried by the vehicle is about 4500 kg and its overall weight must be 16,000 kg as recommended by hydraulic telescopic boom manufacturers. The telescopic boom will elevate microwave scatterometer system and antenna to a maximum height of 27 m, and can also be rotated through 360$^{\circ}$. A mechanism is incorporated in the system to enable tracking or monitoring angular movement of the hydraulic telescopic boom when positioned towards required target.

• Journal of the Korean Society of Industry Convergence
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• v.22 no.6
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• pp.757-765
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• 2019

In manufacturing An offshore plant is a structure that produces resources buried in the seabed. It can be classified into fixed, floating, and hybrid methods depending on the installation method. In particular, the Lattice boom type crane is typically used because it is used for a long time in the sea and moves to other seas, which is less affected by wind. In this study, the crane was designed by using three-step optimization design in the early stage of the design of Lattice boom crane for offshore plant. Finite element analysis was performed to verify the safety factor, deflection, buckling coefficient and fatigue life of the designed crane and the results were verified.

• Journal of Digital Convergence
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• v.17 no.11
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• pp.509-515
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• 2019

The purpose of this study is to analyze the learning needs for lifelong education of the baby boom generation, the role of higher education and to reorganization plan the lifelong learning system at higher education levels to realize the lifelong learning system. In order to do this, this study analyzes the present condition of lifelong learning for each age group in South Korea, especially the participation and learning needs of the baby boom generation. Based on this, present lifelong learning reorganization plans in universities examine for the realization of a lifelong learning system.

• Journal of Fisheries and Marine Sciences Education
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• v.29 no.3
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• pp.878-887
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• 2017

This study performed a qualitative research on the transformative learning cases in vocational education for female baby-boom generation. The baby-boom generation that recently starts retirement is participating in vocational education for their re-employment. Even though their first goal of education was to find a job, they experienced in finding themselves through the actual education. Especially, female baby-boom generation learners were finding their own identity as an entity of social participation, getting out of the existing identity as wife, mother, and housewife. Such a learning experience was the process of recovering themselves, and in this process, new meanings of life were formed. In the results of the study, first, the learning experience in vocational education was the transformative learning to find themselves. They newly created themselves by critically introspecting their negative experience and perception of themselves, and then rearranging/cognizing the accumulated experiences. Second, the immersion in the transitional process to learner increased the motivation for learning and also drew learning about learning. Especially, they reinterpreted their educational methods and contents based on their learning experience in the vocational activity. Through the process, they learnt their past learning experience again. Third, the educational volunteer activity through learning club was a place for study to practice learning. Through this, the research participants realized that theories could not be separated from practice.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.39 no.12
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• pp.1265-1273
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• 2015

A coal handling machine is a type of equipment used for loading coal, the main material in a steam power plant, along a conveyer belt from a ship, and is placed after the driving chain bucket. However, studies on the boom hoisting cylinder, which is a hydraulic system used to control the angle of the boom based on loading location, indicate that domestic models are insufficient, and are thereby often substituted with a foreign product. In this study, a technique for analyzing the contact pressure in a thick-walled cylinder was established by comparing the contact pressure, which is calculated theoretically based on the results obtained from FEM simulation, and by checking whether the working oil is leaking from the boom hoisting cylinder using a v-seal. In addition, the driving motion was simulated according to the strokes of the cylinder, and the structural stability was verified under the maximum output conditions.

• Journal of Korean Public Health Nursing
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• v.26 no.3
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• pp.440-452
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• 2012

Purpose: The purpose of this study was to provide basic data for use in development of strategy for healthy aging preparation and successful transfer to old age by identifying factors influencing quality of life of the baby boom generation. Methods: The data were collected from a total of 205 members of the baby boom generation(aged 48 to 56), and analysis was performed using descriptive statistics, t-test, ANOVA, Pearson's correlation coefficient, and stepwise multiple regression using the SPSS(Version19.0) program. Results: Burden for taking care of children, aging anxiety, preparations for old age, and quality of life according to the general characteristics and health-related characteristics commonly showed a significant difference in education level and presence of stress. The greater the more burden for taking care of children and the deeper the aging anxiety, the lower the quality of life, and the better prepared for aging, the higher the quality of life. Factors affecting quality of life in the baby boom generation included preparations for old age, burden for taking care of children, monthly household income, and quality of sleep. Explanatory power was 32%. Conclusion: For successful transition to old age and for improvement of quality of life in the baby boom generation, a comprehensive approach in micro and macro dimensions will be sought.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.48 no.7
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• pp.497-504
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• 2020

A technique was developed for analysis on sonic boom created by supersonic flight and for prediction of its sound level and atmospheric propagation characteristics. It is of great importance to anticipate sound level of sonic boom because it causes environmental issue. For that purpose, the simplified sonic-boom prediction method was applied to calculate sound pressure according to physical properties and flight information of the object and distance to measurement site, in this study. Propagation characteristics of shock wave emanated from a flying object was analyzed by using line-of-sight vector and ray tracing method which dealt with refraction of wave due to atmospheric density distribution along altitude. Predicted results agreed well with measured data from real flight.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.34 no.4
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• pp.501-509
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• 2010

A floating crane is a crane-mounted ship and is used to assemble or to transport heavy blocks in shipyards. In this paper, the static and dynamic response of a floating crane and a heavy block that are connected using elastic booms and wire ropes are described. The static and dynamic equations of surge, pitch, and heave for the system are derived on the basis of flexible multibody system dynamics. The equations of motion are fully coupled and highly nonlinear since they involve nonlinear mass matrices, elastic stiffness matrices, quadratic velocity vectors, and generalized external forces. A floating frame of reference and nodal coordinates are employed to model the boom as a flexible body. The nonlinear hydrostatic force, linear hydrodynamic force, wire-rope force, and mooring force are considered as the external forces. For numerical analysis, the Hilber-Hughes-Taylor method for implicit integration is used. The dynamic responses of the cargo are analyzed with respect to the results obtained by static and numerical analyses.