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김종범(Kim, Jong-Bum) 한국항공우주연구원 2016 항공우주산업기술동향 Vol.14 No.1
증거기반 정책이 보편적인 현상으로 자리잡고 있으며, 본 연구에서는 한국의 항공우주 R&D 분야에서의 증거기반 중장기 투자전략을 살펴보았다. 세계 및 한국의 시장·산업 현황, 시장성, 공공성, 기술역량, 정부투자생산성, 우선투자 전문가 설문 등의 분석을 기반으로 한국의 항공우주 R&D 투자전략을 살펴보고자 한다. In this study, we tried to examine the medium and long-term investment strategy based on the evidence in the R&D field of Korean aerospace technologies. Through the analysis of factors such as the current state of the world and Korean market, current status of investment, marketability, public nature, technical capabilities, productivity of government investment, expert questionnaire of priority investment in the Korean aerospace technologies, we presented the R&D investment strategy of aerospace technologies.
미시적 역학을 이용한 복합재료 구조물 수명예측 프로그램 개발
김종범 ( Jong Bum Kim ) 공군사관학교 2012 空士論文集 Vol.63 No.1
본 연구에서는 고성능 병렬 유한요소 해석을 수행할 수 있는 그래픽 인터페이스 기반 소프트웨어DIAMOND/IPSAP의 다양한 모듈 중 하나로 가속화시험 방법(ATM;Accelerated Test Method), 분리-혼합 기법(Unmixing-Mixing Scheme), 미소역학에서의 파손이론(MMF;Micomechanics of Failure)을 적용한 복합재료 수명예측 프로그램 DIAMOND/Composite를 개발하였다. 이 프로그램은 시간간격 이후 가속화 시험기법의 강성(stiffness) 마스터커브를 통해 얻은 기지와 섬유의 물성치 자료들을 혼합기법을 통해 균질화된 적층 물성치를 도출하고, 이 물성치를 이용해 유한요소 해석을 한다. 해석의 결과로 각 요소에서의 변위와 응력을 얻고, 분리기법을 통해 섬유와 기지에서의 미시응력과 변형률을 계산한다. 가속화 시험기법 통해 도출한 미시적 수준의 강도(strength) 마스터커브와 미시적 파손이론을 적용하여 파손 시간을 찾을 수 있다. In this study, the life prediction tool, DIAMOND/Composite, was developed for the analysis of composite structures and components. The DIAMOND/Composite is one of the various modules of the DIMOND/IPSAP that performs high performance parallel finite element analysis software based on graphical user interface. The DIAMOND/Composite integrates three theories and methods: an accelerated testing method(ATM), unmixing-mixing scheme, and micromechanics of failure(MMF). At a given time t_i, we can obtain the constituent fiber and matrix properties from the stiffness mastercurve and the homogenized ply properties by using mixing scheme. Then the FE analysis is conducted to calculate stress and strain components on all elements. The unmixing scheme is used to amplify the macro stresses into the micro stress components in fiber and matrix constituents of every finite element. These micro stresses are plugged into the strength mastercurves of ATM and the mastercurve will yield the time to failure t_f.
김종범 ( Jong Bum Kim ),김경환 ( Kyung Hwan Kim ),최병길 ( Byung Gil Choi ),송경석 ( Kyung Seuk Song ),배귀남 ( Gwi Nam Bae ) 한국환경과학회 2016 한국환경과학회지 Vol.25 No.4
With the development of nanotechnology, nanomaterials are used in various fields. Therefore, the interest regarding the safety of nanomaterial use is increasing and much effort is diverted toward establishment of exposure assessment and management methods. Occupational exposure limits (OELs) are effectively used to protect the health of workers in various industrial workplaces. This study aimed to propose an OEL for domestic multi-walled carbon nanotubes (MWCNTs) based on animal inhalation toxicity test. Basic procedure for development of OELs was examined. For OEL estimation, epidemiological study and quantitative risk assessment are generally performed based on toxicity data. In addition, inhalation toxicity data-based no observed adverse effect level (NOAEL) and benchmark dose (BMD) are estimated to obtain the OEL. Three different estimation processes (NEDO in Japan, NIOSH in USA, and Baytubes in Germany) of OELs for carbon nanotubes (CNTs) were intensively reviewed. From the rat inhalation toxicity test for MWCNTs manufactured in Korea, a NOAEL of 0.98 mg/㎥ was derived. Using the simple equation for estimation of OEL suggested by NEDO, the OEL of 142 μg/㎥ was estimated for the MWCNT manufacturing workplace. Here, we used test rat and Korean human data and adopted 36 as an uncertainty factor. The OEL for MWCNT estimated in this work is higher than those (2-80 μg/㎥) suggested by previous investigators. It may be greatly caused by different physicochemical properties of MWCNT and their dispersion method and test rat data. For setting of regulatory OELs in CNT workplaces, further epidemiological studies in addition to animal studies are needed. More advanced technical methods such as CNT dispersion in air and liquid should be also developed.
중전기기 절연용 고농도 폐 육불화황(SF<sub>6</sub>)의 플라즈마 열분해특성 및 부산물 고정화 기초 연구
김종범 ( Jong Bum Kim ),류재용 ( Jae Yong Ryu ) 한국폐기물자원순환학회(구 한국폐기물학회) 2020 한국폐기물자원순환학회지 Vol.37 No.8
SF<sub>6</sub> was decomposed using the high-temperature heat generated during cement production and plasma pyrolysis, followed by the immobilization of the CaO and SF<sub>6</sub> byproducts in the kiln combustion reactor and the resource recovery; based on the results, some ways to prevent the SF<sub>6</sub> recombination, analyze the byproduct characteristics, and identify their generation path are suggested. In this study, the plasma power range from 5.9 to 10.1 kW; with increasing its value, the SF<sub>6</sub> destruction and removal efficiency also increased. When the water vapor was not added or added equivalently, the SF<sub>6</sub> byproducts were HF, F<sub>2</sub>, SO<sub>2</sub>, and SO<sub>2</sub>F<sub>2</sub>; when the water vapor was added in excess, they were only HF and SO<sub>2</sub>. Therefore, adding excessive water vapor would be appropriate to produce gypsum by immobilizing the byproducts from CaO and SF<sub>6</sub> decomposition in the cement kiln combustion reactor.
고온 연소로를 이용한 고농도 육불화황(SF<sub>6</sub>) 분해 부산물의 Bead-Type 산화칼슘(CaO) 고정화 연구
김종범 ( Jong Bum Kim ),류재용 ( Jae Yong Ryu ) 한국폐기물자원순환학회 2021 한국폐기물자원순환학회지 Vol.38 No.6
The cement industry is a typical energy-intensive industry that emits massive greenhouse gases during decarboxylation and calcination with high energy consumption per unit of value-added production. As a result, the pressure for mandatory reduction of cement production increases, which leads to a considerable economic loss. Since the marginal cost of greenhouse gas reduction is high, it is necessary to apply the development of economical greenhouse gas reduction measures and technologies. Sulfur hexafluoride (SF<sub>6</sub>) is a greenhouse gas with a very high global warming potential, it is mainly used for insulating materials and semiconductors for electric power and transmission facilities with heavy electric fields. This study aims to decompose SF<sub>6</sub> gas which gets discarded after being used as an insulator for heavy electric devices in high temperatures by fixating it into free calcium oxide (CaO) in cement kilns and using it as a supplementary material like fluorspar and plaster. Based on results from previous research, in this study the discarded SF<sup>6</sup> was fixated it into the bead type of CaO under a fixation temperature of 1000℃. The fixation rate calculated using the concentration difference between the front end and the hinder end of the decomposed by-products was 95% on average. The bead type of the fixated by-product was largely composed of calcium fluoride, anhydrite, and portlandite as the main composition minerals. Therefore, it is considered that if sulphur hexafluoride can be decomposed in high temperatures and fixated into free CaO in cement kilns, it can be used as supplementary minerals like fluorspar and plaster.