• 한국군사과학기술학회지
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• 제27권1호
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• pp.31-42
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• 2024

In this study, the methodology of determination of base bleed motor data for base bleed projectile based on the NATO standard trajectory model, especially STANAG 4355 Method 2 were presented. Ground combustion experiments and aerodynamic performance firing tests were conducted to determine the drag reduction motor data of the base bleed projectile and this data was described based on the NATO standard ballistic model. The derived drag reduction motor data were input into the ballistic equations to complete the ballistic model and it was confirmed that the calculated predicted trajectory from the ballistic model matched well with the measured trajectory from the aerodynamic performance firing tests.

• Journal of Microbiology and Biotechnology
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• 제27권7호
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• pp.1276-1280
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• 2017

The mcr-1 gene is a new "superbug" gene discoverd in China in 2016 that makes bacteria highly resistant to the last-resort class of antibiotics. The mcr-1 gene raised serious concern about its possible global dissemination and spread. Here, we report a potential anti-resistant strategy using the CRISPR/Cas9-mediated approach that can efficiently induce mcr-1 gene knockout in Escherichia coli. Our findings suggested that using the CRISPR/Cas9 system to knock out the resistance gene mcr-1 might be a potential anti-resistant strategy. Bovine myeloid antimicrobial peptide-27 could help deliver plasmid pCas::mcr targeting specific DNA sequences of the mcr-1 gene into microbial populations.

• 한국토양비료학회지
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• 제41권2호
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• pp.75-82
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• 2008

벼에 대하여 인산과 칼리비료의 비효를 검토하기 위하여 2005~2006년에 토양의 유효인산 및 치환성칼륨 함량이 다른 2개 토양, 품종은 추청벼를 공시하여 포장시험을 수행하였다. 수량으로 본 인산 및 칼리의 비효는 2년 평균수량으로 볼 때 표준시비구($45-57kg\;ha^{-1}$) 수량 100에 대하여 기본시비구($30-30kg\;ha^{-1}$) 97~98, 무비구 93~97이였으며, 인산 무비구는 표준시비구에 비하여 토양양분 함량이 낮은 토양에서 7%의 유의성 있는 수량감소가 있었다. 수량구성요소도 수량과 같은 경향으로서 인산과 칼리의 표준시비구와 기본시비구와의 차이는 적었다. 수확기 인산과 칼리의 흡수량 역시 표준시비구를 기준하여 볼 때 무비구는 근소한 감소를 보였으나 표준시비구와 기본량 시비구와는 차이가 없는 대등한 결과를 보였다. 인산 및 칼리이용률은 유효인산과 치환성칼륨 함량이 다른 답유형에 관계없이 인산 칼리의 기본시비구가 표준시비구보다 높았으며, 토양의 유효인산과 치환성칼륨 함량이 높은 보통답은 토양의 인산과 칼륨함량이 낮은 미숙답보다 높았다. 수확기 토양의 유효인산 및 치환성칼륨 함량은 재배전 이들 성분의 함량의 다소에 관계없이 무시용구에 비하여 표준시비구와 기본시비구는 다소 증가하는 경향이지만 표준시비구와 기본시비구와의 차이는 적었다. 현미품위 및 식미관련 형질로 볼 때 현행 인산 및 칼리의 표준시비구에 비하여 기본시비구는 근소한 차이나마 완전립은 증가하였으나 분상질립, 피해립, 균열립, 아미로스 함량 및 단백질 함량은 감소하였다. 이상에서 인산과 칼리질비료 시용이 수량, 수량구성요소, 흡수량, 이용률, 토양화학성및 미질 등을 종합해 볼 때 사질답, 습답, 중산간답, 냉조풍지, 산간고랭지, 냉수용출답및 객토답을 제외한 보통답 조건에서는 현행 인산과 칼리 표준시비량 4.5, $5.7kg\;ha^{-1}$를 기본량인 3.0, $3.0kg\;ha^{-1}$로의 조정이 가능하였다.

• Journal of Advanced Marine Engineering and Technology
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• 제33권2호
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• pp.304-312
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• 2009

Automated design system of injection mold was developed in this study. Shapes of mold parts and mold base were defined according to standards of mold components and database modules of mold components were built. And then an automation program of mold design was developed by the user definition features, family table and Pro/Program of Pro/Engineer. The automatic production divided into mold base and standard parts was manipulated to manufacture parts meeting the design requirements and the selected parts were changed in size and shape to meet the design goals. The mold design was also carried out to have organic relations and be easy in case of a change to the mold part or mold base. As a result, it is possible to design the mold efficiently and conveniently modify the designed mold parts and base by using the developed automated design system in this study.

• 전자통신동향분석
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• 제34권3호
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• pp.86-92
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• 2019

New products and services, such as 5G and wireless power transmission equipment, have recently brought about changes in the field of electromagnetic technology. There is a need for the evaluation and measurement of the health effects of such technology. To address this need, the development of international standards related to human exposure to electromagnetic waves of these new technologies are currently being discussed. This article briefly introduces the International Standard Organization standards for human exposure to electromagnetic waves, and focuses on the major standard trends for SAR measurement techniques that employ vector probes, wireless power transfer, and 5G base station measurement.

• 전기학회논문지
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• 제57권9호
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• pp.1660-1668
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• 2008

The WiBro was adopted to the 3G international standard. By the change of specification from Wave 1 to Wave 2, MIMO technology is applied in order to increase the speed of downlink. By MIMO the RF part of WiBro base station is increased to 2 Tx paths. Therefore, the size of RF part is bigger and material cost is increased. For reducing these demerits, the RF part which is consisted of PA, LNA, and TDD switch is designed to one complex RF unit. Also, the experimental results of the RF unit have been discussed. Since the complex RF unit is more compact than the RF part of Wave 1 base station, it can be used as the RF part of Wave 2 base station with 2T/2R MIMO.

• 한국생산제조학회지
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• 제18권4호
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• pp.423-429
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• 2009

The motion base to a film used in 4D cinema theaters or theme parks is different depending on the operator's control or hardware system and this causes inefficiency in management of the theater. There are several different simulation software on the present market, but these are difficult for an animation producer to use them. This study introduces the idea in which a film producer simulates the movement of the motion base by using computer graphic animation tools mostly adopted by production for creating 3D animation and motion control data. Maya and 3D Cross were used to show the path of a motion camera visually. Attitude and axis control data were extracted from the movement of the virtual motion base and were used to control a prototype of the motion base. As a result, the motion control data from computer graphic animation tools can be created so that a film producer can create standard motion control data independently regardless of the hardware and operator's skill.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.791-795
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• 2006

Urban transit is one of the most effective ways for efficient operation and construction of an urban transit by composition system which is liked originally such as rolling-stock, power, signal and infrastructure. Urban rail transit system is running in domestic, imports major equipments from advanced countries and setup for maintenance. But it takes long time because it does each organizations and lines. Also, signal, power and track system apply different standard by each construction organizations it causes an increasing construction of cost accordingly it desperately needs a systematic countermeasure. Therefore standard specification of urban transit have been establishing and operatingfor efficient operation of urban transit and base technology security that is populace ride to become a base of state economy. After track, power and signal system will be announced. Standard specification become more, the importance of administrationof standards is emphasized more. Specification administrator’s the importance which use a computing support tool recently in railroad part in embossed and is predicted to be more such forward. Therefore we propose the effective method of management with track, power signal system by constructed data-base system.

• 산업노동연구
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• 제23권1호
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• pp.85-127
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• 2017

1998년 정부출연연구기관을 대상으로 도입되기 시작한 경영혁신정책으로 인해 정부출연연의 연구개발인력 구조는 지속적으로 변화해왔고, 이 중 가장 두드러진 변화는 비정규직 연구인력의 양적 증가 및 비정규직 고용형태의 다양화라고 할 수 있다. 본 논문에서는 연구기관의 고용구조를 근본적으로 변화시킨 요인이라고 할 수 있는 연구과제 중심 운영제도 PBS(project base system)의 도입 및 운영과 관련하여 지난 20년간 연구개발인력 고용구조상에서 나타난 변화를 살펴보고, 변화의 대표적인 사례인 과학기술 연구분야 비정규직 노동자들의 현황을 분석해 보고자 한다. 연구책임자들은 PBS로 인한 운영비의 압박을 비정규직 연구인력을 고용하는 것을 통해 해결할 수밖에 없는 구조에 놓여있다. 그리고 이러한 구조는 비정규직의 양적인 증가와 다양화를 부추기게 되고, 비정규직들의 임금 및 근로조건을 더욱 열악하게 만들고 있다. 연구기관이라는 특수성을 감안해볼 때, 연구인력의 불안정한 고용지위는 연구의 성과 및 과학기술발전에 있어서 부정적인 영향을 미칠 것으로 예상된다.

• 디자인학연구
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• 제14권1호
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• pp.177-186
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• 2001

It is true that the new development in digital technology has Influenced on the definition of animation like it did on the other fields of an, but this doesnt mean this development drastically changes the traditional concept and replaces it with innovative new one. The more the technology is being developed, the mon it needs traditional base that can lead it to what it originally should be. As an example, computer animation companies are constantly seeking for people who have traditional animation background rather than well-trained computer oriented artists. This means digital technology will be no more a technological threat to the people who has traditional animation background. Consequently, when considering the extended concept caused by this new technology, we have to find its base on the traditional animation concept. Since we dont have any fundamental base in traditional animation and technological base in computer animation, we should consider those in advanced countries as a standard. However, in these days, there is a tendency to worship the words themselves such as "digital revolution", "information technology" etc., not the basics behind them. We cannot expect any achievement with this in mind. This study might be a short cut to the students and animators who want to learn and approach computer animation in a right wav.