• Journal of Biosystems Engineering
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• v.22 no.2
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• pp.137-150
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• 1997

To investigate the feasibility of a boom sprayer in the paddy field, an experimental boom sprayer for both broadcast and directed spraying to the lower part of rice plants was developed. The droplet deposition characteristics of the boom sprayers were experimentally compared to those of power sprayer. Water sensitive papers(WSP) and a machine vision system were used to evaluate the coverage rate and droplet density. It was shown that the broadcast application by the boom sprayer was the best coverage among the tested sprayers. Coverage tate and droplet density were affected by the distance between nozzles and the sprayer ground speed, The best result was obtained when the distance of 30cm and the speed of 1.7km/hr. The directed application showed inconsistency in overall droplet distribution. The inconsistency was judged to be caused by conflict between plants and boom extenders. The power sprayer showed a very wide range of droplet size distribution, relatively larger droplets and inconsistency in cove The power sprayer was judged to be inadequate for the low-volume precision application because of inconsistency in performance and difficulty in adjusting the spraying rate. Based on the droplet coverage characteristics, it was concluded that the self-propelled boom sprayer for the broadcast application was feasible for an alternative to the power sprayer in case of low volume, precision application in paddy condition.

• Korean Journal of Agricultural Science
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• v.49 no.1
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• pp.151-162
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• 2022

This study was conducted to develop a rail-type boom sprayer, performing safe spraying with improved ergonomic postures during pesticide spraying of agro-photovoltaic power system. The sprayer was designed to reduce labor cost and to be safe from pesticide exposure, and was analyzed through a comparison with a conventional spray method. The rail-type boom sprayer, consisted of a self-propelled spray and hose winder, hose, and boom sprayer parts, was designed to automatically pull and spray in the vertical and horizontal directions. The performance of the sprayer for an agro-photovoltaic power system was appropriate. From the analysis of postures with the Ovako Working posture Analysis System (OWAS), Rapid Entire Body Assessment (REBA), and Rapid Upper Limb Assessment (RULA) methods, the musculoskeletal risk factors to the body using the rail-type boom sprayer were less than those with the conventional power sprayer. In addition, the possibility of pesticide poisoning was reduced compared to the conventional power sprayer. The working capacity with the rail-type boom sprayer was more than five times greater, compared with the conventional power sprayer. After performing pesticide spraying with the rail-type boom sprayer, the labor cost was reduced to 42,750 won·yr^-1, which was 90% (402,750 won·yr^-1) less than the cost with the use of a conventional power sprayer (445,500 won·yr^-1).

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2000.02a
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• pp.95-100
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• 2000

• International Journal of Costume and Fashion
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• v.3
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• pp.51-87
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• 2003

This study aims primarily to discuss the question 'What does the red fashion boom in Korean society during the 2002 World Cup mean\ulcorner' For this question, it describes fashion phenomena and characteristics that appeared during the time. Specifically, in order to understand the concrete essence of the red fashion boom in terms of clothing and textiles, this study classifies and describes the red fashion boom as 'object, process and symbol' concepts. It investigates each case within the context of fashion. Outside that context, then, the implications of the red fashion boom are examined based on cultural studies and other sociocultural perspectives. This question is considered by focusing on social pressures as ideology, looking at the voluntary behaviour of Korean people in this context and examining several other factors. This is an investigation of the relationship between fashion, society and culture pursuing fashion theory by reviewing the relevant theoretical backgrounds afforded by the humanities and the social sciences. Based upon the above theoretical discussions, it synthesises what factors contributed to the Korean red fashion boom. Finally, this study briefly states their applicability to cultural marketing in its practical aspects. This study has attempted to throw some light on the question 'What does the red fashion boom in Korean society during the 2002 World Cup mean\ulcorner' The Korean Red Fashion Boom emerged from its interrelation with each context of the World Cup, as in the dualism of 'Janus'. That is, the World Cup functioned as the positive face of a festival that collected deep emotions and passion and contributed to the integration of society. Whereas its negative face, ideologically speaking, personified the invisible capitalistic product produced by the nation, enterprises and the mass media. And the implications of the red fashion boom can be interpreted with reference to the two faced World Cup.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.32 no.6
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• pp.526-532
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• 2008

Structure evaluation for 70/15 $T{\times}105\;m$ LLC(Level Luffing Crane)'s boom was conducted by Finite Element Method. Boom modeled with beam element was fixed by luff rope and boom mount and was received loads from self weight, luff hoisting, traveling motion, slewing motion, and wind force, etc. These applied loads were calculated using various factors presented in the reference standards and were inputted in the analysis model after considering about the adverse conditions of LLC. In the research, deformation, stresses, buckling of boom were evaluated by ANSYS. Structural safety of boom was confirmed in the results of numerical analysis.

• Journal of the Architectural Institute of Korea Planning & Design
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• v.34 no.5
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• pp.39-50
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• 2018

The purpose of this study was to examine the diverse situations and housing related consciousness affecting baby boom generation's housing and to propose new possible housing alternatives for Korean baby boom generation for their old ages. Surveys were used to conduct 1:1 interviews with the baby boom generation. This study analysed the baby boom generation's housing related consciousness regarding living in old age with/apart from their children, sense of responsibility to their children and parents, expectations of support from their children in old age, current preparedness for old age, reasons for difficulties in realizing plans for housing in old age, and housing values in old age in order to examine this generation's diverse view in relation to preparations for housing in old age. Based on the results of the analysis of variables of housing consciousness in relation to old age by each characteristic of the baby boom generation conducted in investigations of the present study thus explained, housing alternatives in old age were 1)family exchange-type housing in old age 2) multihabitation-type housing in old age 3) housing in old-age with workplaces.

• Journal of the Korean Society of Marine Environment & Safety
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• v.6 no.1
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• pp.69-76
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• 2000

Bubble boom may be a good alternative for the prevention of oil spill pollution due to its easy deployment and clean post-process tasks. The present work is focused on the experimental investigation of air bubble movement for the bubble boom by visualization and quantitative PIV measurements. Bubble plume was generated by adjusting the pressure of pressure vessel ranging 6.7 kpa to 14.7 kpa. The results showed at lower inlet velocity and higher supply air flow rate that bubble boom maintained its containing capability reasonably well up to the maximum containing limit.

• Journal of the Korean Society for Marine Environment & Energy
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• v.3 no.2
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• pp.25-32
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• 2000

Fire-resistant boom is one of the most important facilities in in situ homing of spilled oil. Thermal response of a fire-resistant boom to turning is experimentally investigated in this paper by using an electric furnace and a burning test facility. This test facility is composed of a test tank, a fire boom, a hood for inhaling smoke, an incinerator for burning up gases and thermocouples, etc. Thereby a systematic method of approach in small laboratory scale is developed to study the performance of a fire-resistant boom. Burning test is carried out for the fire boom model which has been developed through the present study. It is shown that the present fire boom model has capability to withstand the high temperature around 800℃ and high rate of heat flux on it due to homing. For more realistic experimental environments, larger dimensions in devices and longer time in experiments are recommended in near future.

• KDI Journal of Economic Policy
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• v.30 no.1
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• pp.211-246
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• 2008

This paper evaluates the role of Korean government in the venture capital industry, in particular in the stages of fund-raising and venture investment. Utilizing data from Korean Venture Capital Association (KVCA), the analysis is conducted for the venture boom and post-boom periods separately. Empirical results show that the government played a significant role in the fund-raising stage in both venture boom and post-boom periods. When it comes to the investment stage, however, the empirical results indicate that the government did not accomplish expected roles. In particular, the government failed to induce investments in the outside funds of which the government had a larger stake toward early-staged firms and guide common stock investments during the venture boom period. The empirical outcomes also show that the government has not properly increased venture investments on high-tech industries during the post-boom period. This paper argues tentative reasons why the policy failures were observed in relation to the policy implications and provide several pieces of supporting evidence.

• Journal of Biosystems Engineering
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• v.31 no.3 s.116
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• pp.146-152
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• 2006

Most upland in Korea have irregular field shapes. Boom sprayers working alone winding row will show considerable differences of spraying amount per unit area between left and right booms. If flow rates of both booms are equal. This phenomenon becomes significant as steering radius of sprayer decreases. This study was performed to seek a method which reduce the difference of the spray amount between left, right and center booms while spraying along curvy rows. A flow rate control method for keeping application rate of each boom section constant was proposed and experimentally proved using a boom sprayer attached to a cultivating tractor. The flow rate control device was composed of 3 ball valves and a rotary angle sensor. The rotary angle sensor showed a symmetric voltage output with respect to steering radius. The spray overlapping was happened in a boom nearby the steering center when steering radius of the sprayer was less than 5.2 m. Flow rates for left, right and center booms were regulated using ball valves based on the steering radius and spraying areas ration of right/left boom. The Maximum spraying area ratio ($S_{LR}$) of left to right boom section was 1:3.6 at the steering radius of 5.2 m. However, The Maximum achieved right and left spraying flow ratio was 1:2.7.