• 대한기관식도과학회지
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• 제3권2호
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• pp.313-317
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• 1997

Airway mucus provides the protective functions such as lubrication, barrier, disposal of trapped materials, and humidification. In the normal state, the mucus do not interfere with Bas transport and the other vital functions of lung. In diseases such as asthma, bronchitis, and cystic fibrosis, the mucus hypersecretion was physiologically developed in the response of multiple neurohumoral mechanism system. And regardless of the mechanism, many clinical sequelae result from mucus hypersecretion: atelectasis, infection, increased airway resistance, increased work of breathing, increased cough with its resultant complication. And the condensation of mucus tv mucus hypersecretion can make the mucus plug by which bronchial obstruction is developed. We have experienced a 7 Pear-old male patient with recurrent pneumonic symtom, which the bronchial obstruction was developed by the impacted mucus plug on the bronchoscopic finding. We report this case with the review of literature.

• 한국정보처리학회논문지
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• 제6권3호
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• pp.641-653
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• 1999

The paper is design and implementation of the system to support security communication between a Web Browser and a CGI program by a Web Server using PKI(Public Key Infrastructure. This system uses GSS(Generic Security Service)-API to communicate with PKI, offers a Web user a Client Proxy, and offers a CGI developer there library functions related with security. TLS(Transport Layer Security) supports security communication between a Web Browser and a Web Server, but the system supports security communication between a Web Browser and a CGI program as the protected data received from a Client Proxy are sent to a CGI program, and the CGI program decrypts the data using the library functions supported by this system.

• International Journal of Internet, Broadcasting and Communication
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• 제14권3호
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• pp.258-269
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• 2022

In these days, innovative functions are required to unmanned parcel delivery lockers. As non-face-to-face transactions become the center due to the recent COVID-19 pandemic, many problem occurs in society such as theft crimes and lack of loading space. Therefore, New concept storage device is developed in korea. It has the functions that minimizes empty spaces by using the internal transport device to enable efficient space loading and refrigerate goods such as foods. In order to systematically approach the system design of the unmanned parcel delivery lockers which is the new function is applied, We applied model-based system engineering to improve the development efficiency and use a system modeling language to express the system. We conducted interworking research of CAD data including system modeling and design data. it is expected that this method will increase the effective development efficiency such as maintenance traceability and reduction of development period and cost.

• Nuclear Engineering and Technology
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• 제55권1호
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• pp.324-329
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• 2023

Different types of deterministic solution methods were used to solve neutron transport equations corresponding to half-space and slab albedo problems. In these types of solution methods, in addition to the error of the numerical solutions, the obtained results contain truncation and discretization errors. In the present work, a non-analog Monte Carlo method is provided to simulate the half-space and slab albedo problems with Inönü and Anlı-Güngör strongly anisotropic scattering functions. For each scattering function, the sampling method of the direction of the scattered neutrons is presented. The effects of different beams with different angular dependencies and the effects of different scattering parameters on the reflection probability are investigated using the developed Monte Carlo method. The validity of the Monte Carlo method is also confirmed through the comparison with the published data.

• Journal of Plant Biotechnology
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• 제2권1호
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• pp.13-19
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• 2000

Carbohydrates serve three different principal functions in the metabolism of plants. They are the primary products of energy fixation, they are important transport metabolites, and they are deposited as structural or storage compounds. Modification of carbohydrate metabolism therefore covers approaches to modify yield, to change sink/source relationships and thereby alter the ratio of harvestable material, and to improve the quality of crop plants. The scope of this article is to summarize research done at the Max-Planck-Institute related to the first two fields and to present in some detail what we learned, when we established a new carbohydrate storage form in potato.

• 한국의학물리학회지:의학물리
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• 제1권1호
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• pp.75-84
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• 1990

We have claculated the absorbed dose distributions in water phantom irradiated by high energy photon beam. PDD (Percent Depth Dose) and Beam Profile can be represented by functions of depths and distances by using one dimensional model model based on transport theory. The parameters on scattering and absorption are evaluated by using non-linear regression process method. The values neeessary for calculation are obtained by simple experiment. The calculated values are in good agreement with the measured values.

• 산업공학
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• 제9권1호
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• pp.25-40
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• 1996

It is a time-consuming work to develop a control software for AGVS considering different physical arrangements and transport requirements in automated manufacturing systems. An integrated software environment is suggested to support the development of the control software by utilizing a simulation software which imitates changes in the target shop floor. First, the basic functions of the controller are defined and interactions between modules(function) are identified to enhance the modularity of the controller. Prototype software is developed for the simulation station and the control station, respectively, which are connected with each other by a communication link to transmit predefined messages.

• 기술사
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• 제45권6호
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• pp.37-43
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• 2012

Every year in Europe, soils covering an area larger than the city of Berlin are lost to urban sprawl and transport infrastructure. Soil sealing causes an irreversible loss of the biological functions of soil. As water can neither infiltrate nor evaporate, water runoff increases, sometimes leading to catastrophic floods. Landscapes are fragmented and habitats become too small or too isolated to support certain species. In addition, the food production potential of land is lost forever. There is an urgent need to use this valuable resource more wisely, in order to secure its many vital services for future generations. The EU faces new territorial challenges.

• 한국재난정보학회 논문집
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• 제18권3호
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• pp.622-635
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• 2022

연구목적: 우리나라 인구구조의 변화로 고령자 운전자비율이 높아지고 있으며, 초고령사회로 전환되어 향후 더욱 많은 고령자가 운전을 할 것으로 기대되고 있다. 최근에는 고령자의 교통사고 증가에 따라 사회적 문제가 되고 있는 현실적 문제점을 가지고 있다. 본 연구에서는 연령에 따른 종합적 신체변화를 분석하고, 운전면허의 정밀 적성검사 연령을 추정하고자 한다. 연구방법: 본 연구에서 연령별 운전자의 신체 기능 저하의 의학적 특징을 면밀히 분석해 보았는데 신체적인 면과 인지적인 면에서 나이가 들어감에 따라 전반적으로 기능이 저하됨을 보았다. 그 중에서도 다양한 부분들이 70대 이후에 급격하게 떨어짐을 보이는데, 이는 의학적 측면에서 70세 이후를 고령자라 지칭할 수 있다는 것을 시사하는 것이며, 또한 우리나라 고령자의 안전운전을 위한 다양한 정책을 모색할 때 70세 이상을 기준으로 보고 수립해가야 한다고 판단할 수 있다. 연구결과: 인지기능 및 판단능력의 연령대별 변화추이를 볼 때 70세 이후에는 신체적 능력이 모두 급격히 떨어지는 것을 확인할 수 있었다. 특히, 운전능력에 필요한 시각, 청각, 신체적 기능은 70세 이후에는 극히 일부만이 운전이 가능한 것으로 보이기 때문에, 운전면허 제도와 적성검사 등의 정밀한 분석이 70세 부터는 더욱 신중히 이루어져야 할 것으로 나타났다. 결론: 운전자의 운전능력을 생체능력을 중심으로 고찰하여 고령운전에 중에서 차량운전행태에 영향을 줄 수 있는 위험 연령대를 찾고자 하였다. 향후 고령운전자를 위한 정책과 신체적 차이점을 이해하는데 도움이 될 것으로 기대한다.

• Nuclear Engineering and Technology
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• 제52권6호
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• pp.1137-1147
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• 2020

The discrete ordinates method (S_N) is one of the major shielding calculation method, which is suitable for solving deep-penetration transport problems. Our objective is to explore the available quadrature sets and to improve the accuracy in shielding problems involving strong anisotropy. The linear discontinuous finite-element (LDFE) quadrature sets based on the icosahedron (in short, ICLDFE quadrature sets) are developed by defining projected points on the surfaces of the icosahedron. Weights are then introduced in the integration of the discontinuous finite-element basis functions in the relevant angular regions. The multivariate secant method is used to optimize the discrete directions and their corresponding weights. The numerical integration of polynomials in the direction cosines and the Kobayashi benchmark are used to analyze and verify the properties of these new quadrature sets. Results show that the ICLDFE quadrature sets can exactly integrate the zero-order and first-order of the spherical harmonic functions over one-twentieth of the spherical surface. As for the Kobayashi benchmark problem, the maximum relative error between the fifth-order ICLDFE quadrature sets and references is only -0.55%. The ICLDFE quadrature sets provide better integration precision of the spherical harmonic functions in local discrete angle domains and higher accuracy for simple shielding problems.