• 한국유기농업학회지
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• 제4권1호
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• pp.45-58
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• 1995

This paper studied production characteristics of organic farming products and analyzed management income and production cost of organic farming(rice). In order to analyze these points actually, this study was focused on pruduction activities of a producers' organization, Pulmoo Cooperatives in Hong-Dong Myun, Hong-Seong Region, Chung Nam Province. So the following results were obtained : In 1994, output level and an income rate of rice per unit area(10a) which was produced in organic farming method(O.F.M) was higher than those of general farming method(G.F.M) as about 5%, 7.4%. And management income size of the former was 1.8 times as large as that of the latter. But rice production cost of O.F.M was 1.93 times as much as that of G.F.M, particularily in labor cost and farming equipment cost, light and heat expenses, many other material costs. For the progress of organic farming O.F.M and equipmets should be developed much more, for example, the technics of prevetion against damages by blight and harmful insects and improvement of varieties, natural pesticides, agricultual application of microorganisim, construction of compost heat factory, etc. Since these technics and establishments have taken on the public goods, the development of those should be supported by government.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2006년도 정기 학술대회 논문집
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• pp.1009-1014
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• 2006

Synthetic materials with excellent thermodynamic characteristics and the merit of anti-corrosion are frequently used in buildings and constructions for enforcement of bent in stead of steel plates. Among them, many practical studies have been conducted on bond strength because of increased bond strength of FRP plates. Previous investigators identified the bond strength of FRP plates through experiments with settlement of various variables to identify the bond strength. However, the experiments to identify the bond force are difficult to be conducted because they requires large expenses and long time for equipment arrangement, thus, are conducted with limitation. In this study, for bond experiment, optimum neural network model was developed with use of Back-propagation and Conjugate gradient technique of previous investigators. Learning was performed with use of the variables of previous investigators in developed neural network model so as to identify the bond strength of FRP plates. for verification of developed model, credibility and excellence was proven by comparing with the models of previous investigators.

• 소음진동
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• 제9권3호
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• pp.535-543
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• 1999

The seismic qualification of the structures has been great concern in our engineering society with an effort to reduce the severe damages from an earthquake. However, on the contrary to the importance of the seismic qualification, the whole procedures are used to rely on the advanced countries who require various expenses for the qualification, which leads to the heavy loss of the foreign currency. In this study, the nuclear air conditioning system produced by LG Cable are adopted for the seismic qualification based on the guideline of NUREG, IEEE and ASME code. In order to confirm the validity of the present study, the results from the Ellis & Watts are compared with the present results and, also, the seismic qualification procedures and results mentioned herein are approved by KOPEC, which is a naitonal surveillance institute for the construction of nuclear power plant. From these results, the author confirmed the validity of the present seismic qualification procedures and results, which might be usefully applied to the other kind of seismic qualification of equipments.

• 전자공학회논문지 IE
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• 제43권3호
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• pp.34-40
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• 2006

일반적으로 유체나 연료 공급 장치는 모터를 제어하기 위한 특별한 센서가 필요하고, 센서를 부착하기 위한 보조 장치와 부착하기 위한 공간이 필요하다. 또한 신호선 및 기타 배선 등이 필요하여 어려운 점이 따르게 된다. 본 논문에서는, 불편함과 문제점을 해결하기 위하여 홀센서를 이용한 제어시스템을 제안하였고, 시스템의 제어원리는 모터 동작 단계에 따라 전류흐름에 차이가 발생한다는 것을 이용하였다. 또한 제어 시스템이 우수할 뿐만 아니라 센서 설치에 따른 고장을 줄일 수 있었고, 재료비 및 인건비를 절감할 수 있다. Auto-Pumping 시스템은 Soft-Ware적응용을 통해 모든 유체 공급 시스템에 적용할 수 있으며, 차후에 시스템을 이용한 여러 종류의 장치를 개발할 수 있으리라 본다.

• 한국컴퓨터정보학회논문지
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• 제12권2호
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• pp.307-314
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• 2007

프랜차이즈 물류관리시스템 (FDS)은 SCM (Supply Chaining Management)이나 ECR (Efficient Consumer Response)과 같이 체인점 형식의 원자재의 주문관리를 효율적으로 관리하기 위한 시스템이다. 그러나 기존의 시스템은 PC와 인터넷을 이용한 시스템이나 ARS를 확장한 CTI (Computer Telephony Integration)를 이용하는 시스템이 주를 이루어 별도의 장비가 필요하거나 사용상의 잦은 오류로 영세한 가맹점들에게 많이 보급되지 못하고 있는 실정이다. 이러한 문제를 해결하기 위해 본 논문에서는 모든 가맹점들이 사용하는 카드 체크기를 이용하여 각종 원자재를 주문할 수 있는 웹 카드 체크기를 이용한 물류관리시스템을 개발하였다. 따라서 본 시스템은 별도의 장비나 경제적인 추가 부담 없이 기존 시스템을 이용할 수 있다는 점에서 향후 많은 발전과 사용이 될 것으로 예상된다.

• 대한공간정보학회지
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• 제14권3호
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• pp.31-37
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• 2006

기존의 터널 측량 방법은 관측시간이 많이 소요되고, 이로 인한 공사비 증가 및 공사기간 지연 등의 문제점을 가지고 있기 때문에 터널측량에서의 오차요인과 시간 및 경비절감 문제 등을 해결할 수 있는 측량시스템을 개발하여 효율성 증대를 위한 측량방법을 제안하였다. 이러한 문제점들을 해결하기 위하여 측량 장비와 Note book 컴퓨터를 연결하여 현장에서 실시간으로 터널측량과 동시에 위치 및 오차들을 결정할 수 있는 시스템을 개발하였다. 터널측량시스템을 개발함으로서 터널 측량시 오차발생과 터널 굴착시의 미굴 및 여굴의 가능성을 최소화하여 시공품질의 향상과 원가 절감 및 공기 단축 등의 효과를 가져 올 수 있도록 하였다.

• 한국신뢰성학회지:신뢰성응용연구
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• 제11권3호
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• pp.235-244
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• 2011

Hydraulic hose assemblies deliver a fluid power in various oil pressure equipment such as construction machinery, automobile, aircraft, industrial machinery, machine tools and machinery for ships. Also, they are widely used as pipes in oil pressure circuit. When we estimate their lifetime, it is essential to conduct an accelerated life test by choosing the factor that suits the usage condition of the test object since traditional test method for estimating lifetime under the influence of various external factors incurs hardship in terms of time and expenses. The objective of this study is to propose an acceleration model that takes both temperature and pressure without flexing condition into consideration. The lifetime is estimated by applying the proposed temperature-nonthermal acceleration model to the test data. And we compare the proposed temperature-nonthermal acceleration model and the accelerated life equation suggested by John(1994).

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 1999년도 추계학술대회논문집
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• pp.225-233
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• 1999

Harbor design and construction plan in Korea becomes the most hot issue both in the Maritime Affairs and Fisheries Office and in the related port industries. Production of the plane and cross section maps together with the profile map for harbor project is done firstly and is important in all procedure because it is the most basic datum in counting the constructional expense for determination of the area and capacity. As the expense assigned on surveying part among the total expenses of harbor planning and construction in Korea is very small, it is difficult to make exact maps. Moveover, because the method used to make such maps is mostly traditional surveying such as plane table surveying , offset surveying, stadia surveying and level surveying, etc, it is difficult to get precise three dimensional maps. Therefore, for making more precise map in the harbor project, we have to use the newest surveying equipment. This study discusses the method of old surveying and recent surveying used for the three dimensional map of the site for lighthouse which gives navigational aids for the in-and out-bound ships. The authors are proposing a method for more precise three dimensional positioning in this study.

• 대한건축학회논문집:구조계
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• 제34권11호
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• pp.81-87
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• 2018

Among various types of geothermal heat pump systems, Vertical Closed-Loop Geothermal Heat Pump (VGSHP) has received increasing attention due to a variety of advantages such as the potential to be installed in a relatively small space and improved energy efficiency. In this research, the performance of VGSHP system coupled with heat storage tank was evaluated, by analyzing operational behavior of heat storage tank, the variations of heat pump energy performance due to the connection with heat storage tank, part load ratios characteristics of heat pump and the corresponding energy cost, compared to chiller and boiler based conventional system. The results of this study showed that the VGSHP system coupled with heat storage tank showed an energy saving effect of about 18% for cooling and about 73% for heating, and annual heating/cooling energy cost reduction of 43,000,000 KRW ($ 39,000), compared to the conventional air conditioning system. In addition, after considering both energy cost and initial investment cost including equipment, installation and auxiliary device expenses, payback period of approximately 11.8 years was required.

• International Journal of Computer Science & Network Security
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• 제22권1호
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• pp.269-275
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• 2022

Public healthcare has recently become an issue of great importance due to the exponential growth in the human population, the increase in medical expenses, and the COVID-19 pandemic. Speed is one of the crucial factors in saving life, particularly in case of heart attack. Therefore, a healthcare device is needed to continuously monitor and follow up heart health conditions remotely without the need for the patient to attend a medical center. Therefore, this paper proposes a portable electrocardiogram (ECG) monitoring system to improve healthcare for heart attack patients in both home and ambulance settings. The proposed system receives the ECG signals of the patient and sends the ECG values to a MySQL database on the IoT-cloud via Wi-Fi. The signals are displayed as an ECG data chart on a webpage that can be accessed by the patient's doctor based on the HTTP protocol that is employed in the IoT-cloud. The proposed system detects the ECG data of the patient to calculate the total number of heartbeats, number of normal heartbeats, and the number of abnormal heartbeats, which can help the doctor to evaluate the health status of the patient and decide on a suitable medical intervention. This system therefore has the potential to save time and life, but also cost. This paper highlights the five main advantages of the proposed ECG monitoring system and makes some recommendations to develop the system further.