• 한국전자통신학회논문지
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• 제18권6호
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• pp.1217-1228
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• 2023

본 논문에서는 드론의 공격을 무력화시키는 기술인 안티드론에 대한 기술 및 특허 분석을 실시하였다. 안티드론의 기술 정의, 안티드론 시스템의 기술 요소 등 안티드론의 기술에 대한 조사를 진행하였다. 또한 2011년부터 10년간 국내외에서 출원된 드론 및 안티드론의 출원 특허에 대해 조사하였다. 최근 10년간 국내 특허 출원 건수 및 안티드론에 관한 국내 특허 출원 건수를 조사하였고, 국외 출원의 경우, 미국, 유럽, 일본, 중국, PCT에 최근 10년간 출원된 안티드론에 관한 출원실적을 조사하였다. 국내 안티드론에 관한 특허 내용에 대해 "안티드론"으로 검색된 무력화 기술 특허, 드론의 탐지 및 식별 기술에 관한 특허, 드론의 무력화 기술에 관한 특허 등을 조사하였다. 본 연구를 통해 드론 탐지 기술로 출원된 총 91건의 특허 중 공공기관의 출원은 5건으로 5.5%를 차지하였고, 드론 식별 기술로 출원된 총 174건의 특허 중 공공기관의 출원은 4건으로 2.3%를 차지하였다.

• 한국전자통신학회논문지
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• 제18권5호
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• pp.911-918
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• 2023

본 논문은 미디어 영상과 밀접한 관련이 있는 영상과 음향기기 제조 기술을 분석하고, 출원인을 기업, 연구소, 대학, 개인, 공공으로 구분하여 기술통계 분석, 집단지성 분석, 개방형 혁신분석을 수행하였다. 연구소 및 대학에서 기술을 통한 혁신적인 아이디어의 발현이 필요하며, 대학에서 미디어 분야의 기술을 확대하기 위한 노력이 필요한 시점이다. 실제 출원된 특허의 내용을 살펴보면 기업이나 개인이 출원한 특허는 미디어 기술과 관련된 것이 많았고, 대학이나 연구소에서 출원한 특허는 미디어 콘텐츠와 관련된 것이 많았다. 이는 미디어 기술과 콘텐츠는 불가분의 관계에 있으며 하드웨어 기술 특허의 광범위하고 심도있는 개발이 필요하며 소프트웨어 콘텐츠가 더욱 다양하고 창의적인 역할을 할 수 있는 원동력이 되어야 함을 의미한다.

• 대한수학회지
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• 제58권4호
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• pp.1019-1033
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• 2021

Let 𝚪 be a Gorenstein coalgebra over a filed k. We introduce the Gorenstein transpose via a minimal Gorenstein injective copresentation of a quasi-finite 𝚪-comodule, and obtain a relation between a Gorenstein transpose of a quasi-finite comodule and a transpose of the same comodule. As an application, we obtain that the almost split sequences are constructed in terms of Gorenstein transpose.

• 센서학회지
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• 제21권5호
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• pp.319-323
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• 2012

In this paper, we present the possibility of quantification analysis for $A{\beta}$ captured by micro beads using Near-filed detection. In order to evaluate detection efficiency, detected signals were compared with different sizes of micro beads and a varied number of micro beads. Also, $A{\beta}$ deposits and $A{\beta}$ binding to micro beads were measured, therefore, we observed the $A{\beta}$ deposit and light scattering around the surface of micro beads induced by attached $A{\beta}$. This method can be used for quantitative analysis for not only the number of $A{\beta}$, but also the binding ratio of $A{\beta}$ to micro beads.

• Biotechnology and Bioprocess Engineering:BBE
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• 제3권1호
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• pp.48-49
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• 1998

A protocol for the transformation of Klebsiella oxytoca by electroporation was developed. Preparation of competent cells at early exponential phase was most critical to obtain high transformation efficiency. The highest efficiency of 1.6$\times$106 transformants per $\mu\textrm{g}$ DNA(pBR322) could be obtained by electroporation of K. oxytoca cells prepared at the OD600 of 0.2 with 1.25$\mu\textrm{g}$ DNA at the filed strength of 2.5kV, the parallel resistance of 200$\Omega$ and capacitance of 25$\mu$F.

• Biotechnology and Bioprocess Engineering:BBE
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• 제5권3호
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• pp.202-206
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• 2000

The genetically-engineered Escherichia coli strain, DPD2540, which contains a fabA:::luxCDAbefusion gene, gives a bioluminescent output when membrane fatty acid synthesis is needed. For more pactical application of this strain in the filed as biosensor, freezedrying was adopted. A 12% surcrose solution with Luria-Bertani (LB) broth, as determined by the viability after freeze-drying, was found to be most most effective composition for lyophilization solution among various compositions testitons tested. Rapid freezing with liquid nitrogen also gave the best viability after freeze-drying as compared to samples frozen at-7$0^{\circ}C$ and -2$0^{\circ}C$. The biosensing activities of the cells showed a greater sensitivity when the cells from the expontial phase were freeze-dried. Finally, the optimum temperature for use of the freeze-dried cells in the biodencor field was determined.

• Asian-Australasian Journal of Animal Sciences
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• 제29권12호
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• pp.1734-1741
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• 2016

This study was conducted to examine the effects of adding phytoncide oil extracted from Korean pine nut cone by-product to the diet of dairy cows on milk yield and compositions, fatty acid characteristics, complete blood count and stress response. A total of 74 Holstein cows were used for 30 days and divided into two groups. Each group was given a basal diet (C) or an experimental diet containing phytoncide additives at 0.016% (T) in feed. The results showed that phytoncide feeding had no effect on milk yield. In addition, there were no observed effects on milk composition, but the ratio of fatty acid in milk was significantly affected by the phytoncide diet, and it showed a positive effect. Not only were the major functional fatty acids, conjugated linoleic acid and eicosapentaenoic acid increased, but also ${\omega}6:{\omega}3$ fatty acid ratio was reduced in milk of T group (p<0.05). In blood analysis, the complete blood count showed no significant difference between C and T group on all parameters. However, the cortisol concentration was significantly decreased in T group compared to control (p<0.05). Taken together, we suggest that phytoncide oil does not have a great influence on the physiological changes, but can be a potential feed additive that improves the milk fatty acid and stress resilience in dairy cows. In addition, it will contribute to the development of feed resource, a reduction in feed cost and a lessening of environmental pollution.

• 대한방사선기술학회지:방사선기술과학
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• 제41권6호
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• pp.533-538
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• 2018

As the use of digital radiographic system has been expanded, there are some concerns an increase about in patient of radiation dose. Therefore, International Electro-technical Commission (IEC) has been proposed a standard foe exposure index (EI). In this study, the EI was measured on human chest model using computed radiography (CR). Radiation quality used RQA5 of IEC62494-1. After acquiring the chest anterior posterior image (Chest AP) by using the phantom, the EI was obtained by applying the system response. In this study, we have analyzed the images with the detector size (Full filed ROI) and the optimized image (Fit filed ROI). The EI increased proportionally with radiation dose increase. Due to the discrete increase in pixel value, the EI showed an exponential increase. The discrete increase in noise equivalent quanta (NEQ) resulted in a discrete increase in the EI. The EI of the two images used in this study increased with increasing NEQ but showed different increments. For the measurement of the EI, IEC standards must be followed. The EI should be used as an index to evaluate the image quality for quality control of X-ray image rather than as an indicator of exposure dose. When calculating the EI, the system response should be applied depending on whether or not the grid is used. The size of the field should be obtained by including only the necessary parts.

• Journal of Power Electronics
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• 제8권4호
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• pp.291-300
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• 2008

In this paper power system and drive-train for omni-directional autonomous mobile robots with multiple energy storage units are presented. Because in proposed system, which is implemented in soccer robots, the ability of power flow control from of multiple separated energy storage units and speed control for each motor are combined, these robots can be derived by more than one power source. This capability, allow robot to diversify its energy source by employing hybrid power sources. In this research Lithium ion polymer batteries have been used for main and auxiliary energy storage units because of their high power and energy densities. And to protect them against deep discharge, over current and short circuit, a protection circuit was designed. The other parts of our robot power system are DC-DC converters and kicker circuit. The simulation and experimental results show proposed scheme and extracted equations are valid and energy management and speed control can be achieved properly using this method. The filed experiments show robot mobility functions to perform the requested motion is enough and it has a high maneuverability in the field.

• 한국군사과학기술학회지
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• 제11권3호
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• pp.138-145
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• 2008

In this paper, the waveguide slot array antenna which is capable of wide beam steering and dual polarization is designed for an X band synthetic aperture radar. In order to improve the restriction of beam steering range and to remove the butterfly lobes, a typical waveguide slot array antenna has been modified. To implement dual polarization, rod excited waveguide slot elements and ridge waveguide slot elements are alternately arranged. Location of slots, inclination of rod and offset distance of slots are determined on using array characteristic and conductance constant with radiating power on slots. The designed antenna is manufactured and measured with Near-filed measurement method.