• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2009년도 추계학술발표대회
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• pp.803-804
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• 2009

To accommodate constantly growing knowledge in scientific discourse that is revised over time by domain experts, we need to also evolve our ontology. The body of knowledge will get structured and refined as we develop a deeper understanding of issues. Keeping trail of new changes in semantically rich and formally sound mechanism has pragmatic advantages for providing the undo and redo facility and ontology recovery to a previous state. In this research, we have proposed a framework that support change logging and then using these logged changes for reverting ontology to a previous consistent state and visualization of change effects on ontology. The system is compared with ChangesTab of $Prot{\acute{e}}g{\acute{e}}$ and the results depict better accuracy for our system.

• Asian-Australasian Journal of Animal Sciences
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• 제22권5호
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• pp.667-673
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• 2009

Ninety six intact male sheep (12 months old with mean live weight of about 35 kg) were used to assess the effects of restricted feeding on intake, digestion, nitrogen balance and metabolizable energy (ME). The animals were selected from two known Iranian small and large body size breeds: 48 Sangsari (S) and 48 Afshari (A), and were divided into two equal groups: restricted (R) and a control (C). Each group had 48 sheep (24 each breed). The experiment had a duration of 15 and 75 days adaptation and treatment periods, respectively. The animals were individually placed in metabolism cages and fed a diet based on pelleted concentrate mixture consisting of alfalfa, barley grain, cottonseed meal and barley straw. The animals in group C were fed ad libitum, while animals in group R were fed at maintenance level and maintained a relatively constant live weight. During the experiment, the average daily weight gain (ADG) of S and A animals in R group was 0.34 and -0.25 g/d (0.02 and -0.02 $g/kg^{0.75}/d$), respectively. While that of S and A animals in C group was 174.4 and 194.4 g/d (10.16 and 11.48 $g/kg^{0.75}/d$), respectively. Nitrogen (N) was determined by both measured and regression methods. Animals of R group stayed at about zero N balance (0.01 and -0.00 g $N/kg^{0.75}/d$ for S and A animals, respectively). The N retention of animals of both S and A breeds in C group were similar (0.45 and 0.46 g $N/kg^{0.75}/d$, respectively). Digestible organic matter intake (DOMI) and ME requirement for maintenance (MEm) were measured by both constant weight technique and regression method by regressing N balance on DOMI and ME intake on ADG. The measured DOMI during constant weight was 24.61 and 24.27 g $DOMI/kg^{0.75}/d$ and the calculated DOMI from regression equation was 24.24 and 24.22 g $DOMI/kg^{0.75}/d$, for S and A animals, respectively. The measured MEm was 402 and 401 kJ $ME/kg^{0.75}/d$ and the calculated MEm from regression analysis was 398 and 400 kJ $ME/kg^{0.75}/d$ for S and A breeds, respectively. There were no significant differences between both measured and regression techniques. There was no significant difference between S and A breeds for DOMI, N retention, MEm, digestibility and metabolizability values. Digestibility values for OM, GE and CP and metabolizability were significantly (p<0.05) higher in restricted feeding sheep compared with that of sheep fed ad libitum.

• 보존과학회지
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• 제19권
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• pp.5-18
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• 2006

익산 미륵사지 석탑은 백제 무왕대에 창건되어 몇 차례 수리 및 개축작업을 하면서 현 상태를 유지해 왔으나 최근에 구조적인 불균형이 심화되어 탑의 원형에 따른 보존과학적 수복을 위해 해체중이다. 이 탑의 원형은 평면방형탑으로 9층으로 추정되나 최근까지 일부 6층까지만 남아 있었다. 붕괴되어 망실된 부분은 1915년 일본인들이 콘크리트를 이용하여 불안전 탑의 형태를 고정시켜 놓았다. 현재 암석의 표면에는 침전물질이 피각되어 백화현상을 유발하였고 이로 인해 원암의 조직과 색상이 훼손되어 있다. 따라서 표면에 피각된 이차적 무기 오염물질의 종류와 산출상태 및 오염종을 정량 분석하였다. 또한 용해실험을 통해 가용성 오염종을 규명하고 이에 대한 오염물질을 세정하는데 필요한 조건을 제시하였다. 이 결과는 석조문화재 표면의 무기오염종을 정량적으로 규명할 수 있는 자료를 제공할 것이며, 백화현상을 제어 할 수 있는 표면 세정제의 보존과학적 적용에 기여할 것이다.

• 지질공학
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• 제26권1호
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• pp.129-142
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• 2016

국립공원은 주로 산악 지형 내 조성되어 있으므로 산사태에 의한 피해 가능성을 항상 내포하고 있다. 본 연구는 산사태 연구의 일환으로 국립공원 탐방로 내 위험 급경사지를 체계적으로 유지관리하기 위한 방안을 마련하는데 목적이 있다. 국립공원에 특화된 자체 체크리스트를 제작하였으며, 전국 19개 국립공원 183개소 급경사지에 대한 실태조사가 이루어졌다. 실태조사의 최종 목적은 위험 급경사지에 대한 안정화 대책을 마련하는 것으로 현장조사와 안정해석의 과정을 거친다. 일부 급경사지에서 는 위험성 판단을 위해 지상라이다 등 특수 장비를 이용한 조사를 시도하였다. 중장기 정비계획을 위한 투자우선순위 공식을 개발하였으며, 현장자료를 이용한 순위 및 위험등급을 산출하였다. 최종적으로 위험 급경사지의 향후 체계적인 관리를 위해 "국립공원 급경사지 유지관리시스템"을 개발하였으며, 모든 현장자료들은 시스템 내 DB화 되었다.

• Ocean and Polar Research
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• 제42권2호
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• pp.171-178
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• 2020

R/V EARDO, commissioned in 1992, has successfully carried out ocean research campaigns in Korean jurisdictional and adjacent waters, including continental margins and coastal zones within the Korean Exclusive Economic Zone (EEZ), for 29 years. However, it will soon be reaching the end of its useful service life. A replacement for R/V EARDO is urgently needed to ensure the safety of vessel itself and its crews, and efficient ship operation and maintenance, as well as to meet modern scientific mission requirements (SMRs). Basic specifications for a replacement ship have been devised and reviewed over the past nine months. A test of the proposed hull form was also performed. The total tonnage of the proposed vessel is approximately 740 tons, and the overall length and width are 62.0 and 11.6 m, respectively. The new ship will thus be 73% larger than the current R/V EARDO; in particular, the research workspace will be 4.4 times larger. The major design priorities are the propulsion system, efficiency of radiated noise and vibration control, and the dynamic positioning system. An environmentally friendly emission system, meeting International Maritime Organization (IMO) Tier III regulations, will be installed in the third exhaust pipe. Various wet and dry lab spaces as well as 32 different scientific instruments have also been considered in the ship design.

• 한국강구조학회 논문집
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• 제25권4호
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• pp.321-333
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• 2013

본 연구는 연구프로젝트의 기술과 기술의 기능의 체계적 관점에서 기술트리라는 과학적인 방법론의 사례를 제공한다. 기술트리 프로세스를 활용하여, 강구조물 중에 가장 범용적으로 사용되고 있는 입체 트러스 구조물을 대상으로, 차량을 차단하지 않는 터널 가설공사에 적합한 스마트한 입체 트러스 구조물이 되기 위한 세부 기능과 요소기술을 도출하는 기술전개 방법론을 제안한다. 본 연구에서는 이러한 기능분석 방법론은 문헌, 해석연구를 통한 검증프로세스를 통해 피드백이 가능함을 증명하였고, 향후 타 분야 기술의 효과적인 세부기능 전개 및 요구기술 도출에 활용이 가능할 것으로 사료된다.

• Structural Monitoring and Maintenance
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• 제2권1호
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• pp.35-48
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• 2015

The main objective of this study is to evaluate the long-term performance of various concrete composites in natural marine environment prevailing in the Gulf region. Durability assessment studies of such nature are usually carried out under aggressive environments that constitute seawater, chloride and sulfate laden soils and wind, and groundwater conditions. These studies are very vital for sustainable development of marine and off shore reinforced concrete structures of industrial design such as petroleum installations. First round of testing and evaluation, which is presented in this paper, were performed by standard tests under laboratory conditions. Laboratory results presented in this paper will be corroborated with test outcome of ongoing three years field exposure conditions. The field study will include different parameters of investigation for high performance concrete including corrosion inhibitors, type of reinforcement, natural and industrial pozzolanic additives, water to cement ratio, water type, cover thickness, curing conditions, and concrete coatings. Like the laboratory specimens, samples in the field will be monitored for corrosion induced deterioration signs and for any signs of failureover initial period ofthree years. In this paper, laboratory results pertaining to microsilica (SF), ground granulated blast furnace slag (GGBS), epoxy coated rebars and calcium nitrite corrosion inhibitor are very conclusive. Results affirmed that the supplementary cementing materials such as GGBS and SF significantly impacted and enhanced concrete resistivity to chloride ions penetration and hence decrease the corrosion activities on steel bars protected by such concretes. As for epoxy coated rebars applications under high chloride laden conditions, results showed great concern to integrity of the epoxy coating layer on the bar and its stability. On the other hand corrosion inhibiting admixtures such as calcium nitrite proved to be more effective when used in combination with the pozzolanic additives such as GGBS and microsilica.

• 한국화재소방학회논문지
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• 제21권1호
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• pp.37-50
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• 2007

소방기관의 기본업무는 화재를 예방 경계하거나 진압하고 화재, 재난 재해 그 밖의 위급한 상황에서의 구조 구급활동 등을 통하여 국민의 생명 신체 및 재산을 보호함으로써 공공의 안녕질서 유지와 복리증진을 하는 것이다. 이러한 소방업무 중 구조 구급분야는 국민으로부터 적극적인 지지를 받고 있지만 국민의 신뢰를 받지 못하고 있는 한 분야가 화재조사와 수사 관련업무라고 볼 수 있다. 화재조사는 소방행정 중에서도 그 비중이 매우 높고 중요한 분야 임에도 이에 대한 인식과 관심의 부족으로 소홀하게 인식되어 왔다. 화재조사에 대한 교육연구 및 전담기능도 부족하여 과학적인 화재조사가 이루어지지 않고 있다. 우리나라의 화재조사와 수사체계는 아직 개선해야 할 부분이 많이 있다. 특히 화재조사와 수사의 정확도를 높이기 위해서는 화재조사와 수사 전문인력의 확보를 통해 전담부서를 설치하는 것이 시급하다. 물적으로는 과학적 화재조사와 수사를 할 수 있는 장비들을 충분히 구비하여야 한다. 또한 화재조사와 수사에 있어 미비한 법제도를 개선하고, 화재조사 소방공무원에게도 발전적으로 수사권을 부여하여 화재조사와 수사의 효율성을 증대하여야 한다. 이를 통해 유기적으로 화재예방에 도움이 될 수 있도록 하여야 한다.

• 한국항행학회논문지
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• 제22권4호
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• pp.319-324
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• 2018

본 논문은 RF 전력 반도체를 사용한 고출력 전력증폭기를 구현한 것으로 기존의 플라즈마 발생 장치에 사용되는 마그네트론 방식의 고출력 증폭기 문제점인 낮은 효율과 짧은 수명, 유지 보수의 어려움 그리고 높은 운용비용 등을 개선하기 위한 것이다. 구현된 고출력 전력증폭기는 2.45 GHz ISM (industrial scientific medical) 대역에서 공간 결합방식을 이용한 저 손실, 고출력 레디알 결합기와 반도체로 3 kW급 출력을 얻기 위해서 300 W 급 전력 증폭기 16개의 증폭기로 구성되어 있다. 또한, 이 증폭기는 개별적인 증폭기에 수냉 방식의 구조를 적용하여 고출력에 따른 발열문제를 극복하였다. 소형 시스템으로 구성된 이 전력증폭기는 원하는 출력에서 50%의 높은 효율을 얻었다.

• International Journal of Computer Science & Network Security
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• 제21권9호
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• pp.118-124
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• 2021

The article examines the formation of a competitive paradigm of economic security of industrial enterprises in the formation of a circular economy. The basic laws of industrial enterprises are formed, which determined the characteristics of competitive positions and threats. The basic competitive concepts and their application at maintenance of economic safety of the industrial enterprises in the conditions of formation of circular economy are described. Thus, the technological approach to the formation of a competitive paradigm is based on production technologies, opportunities for technological modernization and development of infrastructure and intellectual competencies. The institutional concept reveals the regulatory mechanisms for ensuring competitiveness through the protectionism of national industrial enterprises, standardization and regulation of market imbalances. The innovation-investment approach within the competitive paradigm is also manifested in the creation of competitive advantages due to the presence of active innovative developments and their commercialization, knowledge and competencies of staff, capitalization of intelligence and communications, constant updating of infrastructure and technologies. Collectively, innovation and investment effects on the level of economic security allow industrial enterprises to ensure resilience to increasing competition, the emergence of new market challenges in the formation of a circular economy. A strategic approach to the application of a competitive paradigm to ensure the economic security of industrial enterprises allows you to justify the prospects for development and design behavioral models to predict and assess potential threats. The concept of system management is based on the complexity of threat analysis, the integrity of the economic security system, system-forming functions and patterns of implementation of industrial development tasks in the formation of a circular economy. The application of the described concepts is formalized by the authors through the definition of the basic patterns, directions and characteristics of their impact on the elements of the security system of industrial enterprises in the formation of a circular economy.