• Progress in Medical Physics
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• v.3 no.1
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• pp.35-44
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• 1992

We developed a new algorithm for displaying two-dimensional isodose curves and three-dimensional isodose surfaces. And we used it to brachytherapy dose planning. This program can display isodose surfaces with various view angles. We can also present isodose curves corresponding to arbitrary section of the surface As a result, we knew that this program can help understanding about three-dimensional dose distribution.

• Journal of the Semiconductor & Display Technology
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• v.19 no.3
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• pp.36-42
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• 2020

Silver nanowire (AgNW) random-meshes with high transmittance, low sheet resistance, and high oxidation stability and flexibility were fabricated using solution-based processes. The random-mesh structure was obtained by forming bubbles whose sizes and densities were controlled using a corona treatment of polyethylene terephthalate (PET) substrates. To reduce the sheet resistance of the fabricated AgNW electrode, a washing process using ethanol solution was performed. In addition, nickel (Ni) was coated on AgNW to improve resistance to oxidation. The effects of corona treatment and Ni-coating on the transmittance, sheet resistance, oxidation stability, and flexibility of the AgNW electrodes were investigated.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.18 no.3
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• pp.235-242
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• 1985

The mechanics of the walking shrimps is useful to clarify the fishing mechanisms in relation to the fishing gears. The gaiting behaviour concerning step positions and step timings on the flat board and the nettings, 16, 23 and 37mm in mesh size were experimented in the aquarium using video camera from June to October, 1984. It was found that the irregular movements of walking legs in step positions and step patterns were appeared on the nettings more than the flat surface due to the absence of mechanical contact with the substrates. The mean stride length and coefficient of variation of the periods in the walking shrimps on the flat board were significantly different from those values on the nettings, However, the velocity, the period and the ratio of forestroke to backstroke were unsteadily changed with the carapace length, and showed little difference under the four conditions. The mean phase difference on the flat board was greater than those values on the nettings which were decreased, while standard deviation on the flat board was smaller than those values on the nettings which were increased with increasing in mesh size.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2003.10a
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• pp.59-62
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• 2003

우리나라의 선망어업은 제주도 주변해역을 중심으로 소흑산도, 대마도 동북방해역과 동중국해에서 고등어, 전갱이, 정어리 등 부어류를 주 어획대상으로 연중 조업이 이루어지며 연근해 어업 중에 그 규모가 가장 큰 중요한 어업이다. 선망어업은 다른 어범에 비하여 그물어구가 대형이고 조업방법이 복잡하며 신속한 어구의 조작이 필요한데, 선망어구의 형상은 단순하나 망지의 분량은 대단히 많다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2009.05a
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• pp.103-106
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• 2009

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2009.05a
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• pp.107-110
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• 2009

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.10a
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• pp.51-52
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• 2001

남해안의 사니질에 주로 서식하는 보리새우(변, 1970, 1974)는 주로 삼중자망으로 어획되고 있으며, 활어 또는 선어 상태로 고가로 소비되고 있는 중요한 어업생물이다. 보리새우의 생태, 습성 등으로 미루어보아 현재 허가된 대하 삼중자망외의 어구, 어법으로는 어획이 거의 없거나 조업이 불가하여 합법적으로 어획하지 못하고, 보리새우 자원을 방치해야할 실정이다. 따라서 본 연구에서는 수조에서 보리새우의 습성과 그물에 대한 반응행동 및 어획시 이동 현상 등을 관찰하고, 새로운 홑자망을 구성하여 삼중자망 등과 같이 시험조업을 실시하고 현재까지의 결과를 보고한다. (중략)

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.14 no.3
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• pp.115-122
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• 2004

When porous materials are dried, the particles flocculate into fish-net structure in gel phase. In order to exactly analyze the stress distribution of porous materials during drying process, the elastic tensor of microscopic gel structures has to be predicted considering pore shapes as well as porosities of porous materials. The elastic characteristics of porous materials associated with porosities were predicted analyzing microscopic gel structures with circular and cross pores via homogenization method and the drying processes of the electric porous ceramic insulator were simulated using finite element method (FEM). Comparing analysis results between consideration and negligence of pores, the deformed shape and distributions of temperature and moisture were similar but the residual stress was significantly different.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.27 no.10
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• pp.1667-1675
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• 2003

This paper has considered the calculation of lateral stiffness of radial tire's sidewall, which consists of cord stiffness and rubber sheet stiffness, by using the material constants of rubber compounds of tire. We have suggested and illustrated how to calculate the rubber sheet lateral stiffness by considering the following aspects. First, the rubber sheet consists of various kinds of rubber compounds with different thickness along the sidewall in the radial direction. Secondly, equivalent Young's modulus of the rubber sheet can be calculated by using available experimental data of rubber compounds. The present method enables us to divide the calculation domain as many as we want, which can reduce numerical error in the calculation of geometrical and mechanical properties. We have illustrated the calculation by using the data of the radial tire for passenger car of P205/60R15.

• Journal of Institute of Control, Robotics and Systems
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• v.4 no.6
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• pp.802-810
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• 1998

The purpose of this study is to find the analytic solution of determining the optimal capacity of processes and storages to meet the product demand. Recent trend to reduce product delivery time and to provide high quality product to customer requires the increasing capacity of storage facilities. However, the cost of constructing and operating storage facilities is becoming substantial because of increasing land value, environmental and safety concern. Therefore, reasonable decision making about the capacity of processes and storages is important subject for industries. The industrial solution for this subject is to use the classical economic lot sizing method, EOQ(Economic Order Quantity) model, trimmed with practical experience but the unrealistic assumption of EOQ model is not suitable for the chemical plant design with highly interlinked processes and storages. This study, a first systematic attempt for this subject, clearly overcomes the limitation of classical lot sizing method. The superstructure of the plant consists of the network of serially and/or parallelly interlinked processes and storages. A novel production and inventory analysis method, PSW(Periodic Square Wave) model, is applied. The objective function of optimization is minimizing the total cost composed of setup and inventory holding cost. The advantage of PSW model comes from the fact that the model provide a set of simple analytic solution in spite of realistic description of material flow between process and storage. The resulting simple analytic solution can greatly enhance the proper and quick investment decision for the preliminary plant design confronting diverse economic situation.