Safety evaluation of transportation containers for radioactive material using equivalent test models

임종민,양윤영,도호성,강현구,이주찬 한국원자력학회 2025 Nuclear Engineering and Technology Vol.57 No.5

An innovative method for assessing the safety of transport containers for radioactive material was developed to overcome the limitations of traditional full-scale and scaled-down drop tests. By focusing on equivalent test models that accurately reflect the actual dimensions and characteristics of the containers, this approach addresses the challenges of evaluating containers with internal contents such as waste bags, where traditional methods fail to provide accurate safety assessments. The approach focuses on the impact resistance of container contents by utilizing equivalent test models for a comprehensive safety evaluation. Digital image correlation techniques were employed to measure the rigid body motion of containers during the drop tests, providing a basis for verifying the kinematic accuracy of the analytical models. This method was applied to a container with waste bags as contents. It was found that there was no loss of the sealing function of waste bags and no damage occurred to the compartment walls and welded parts of the transport container. This method is applicable to a wide range of contents where constructing scaled models or conducting analytical assessments is impractical.

지하공동구 내 탈출유도를 위한 알고리즘분석 및 비주얼 시그널 적용 연구

임종민,공효주,조중호 한국통신학회 2021 정보와 통신 Vol.38 No.6

본 논문에서는 지하공동구 내 실시간 다중센서 정보 수집과 분석이 이루어진다고 가정하고 이벤트(재난)가 발생했거나 또는 발생 안했다는 판단 하에 최적 경로 탐색 알고리즘을 통해 PMVS(Pace Maker Visual Signal) 탈출유도 알고리즘을 고찰하고자 한다. In this paper, we assume that real-time multi-sensor information in the underground utility tunnel has been collected and analyzed, and use the optimal route search algorithm when an event (disaster) occurs or under the judgment that it has not occurred. PMVS (Pace Maker Visual Signal) Let us consider an escape guidance algorithm.

위성용 대형 전자 유닛 검증을 위한 파이로 충격 모사장치 개발 및 특성 분석

임종민,우성현,은희광,전종협 한국항공우주학회 2024 한국항공우주학회지 Vol.52 No.11

위성에 사용되는 전자 유닛 및 우주 부품은 발사 단계에서 부가되는 진동과 충격환경을 견딜 수 있는능력을 확인하기 위해 지상에서 사전 검증이 수행되어야 한다. 특히 충격환경은 위성체 분리, 발사체 페어링 분리 및 태양전지판 전개시에 사용되는 파이로 장치에 의해 발생되며, 인접한 전자 유닛 및 탑재체에심각한 손상을 일으킬 수 있다. 따라서 우주 비행 전에 충격 하중 조건에서 장비의 기능을 보장하기 위해지상 검증과정을 거쳐야 한다. 일반적으로 유닛 레벨에서 충격환경의 검증은 기계적 충격과 구조적 공진특성에 의해 모사되는 충격환경에 시험 대상체를 노출시키는 방식으로 수행된다. 본 연구에서는 위성체에사용되는 대형 전자 유닛의 충격환경 검증을 위하여 파이로 충격 모사장치를 개발하였다. 원형 공진장치를적용하여 충격 스펙트럼의 Knee frequency를 제어하고, 시험 대상체가 장착되는 상부면에서 원주 방향으로균일한 응답을 생성할 수 있도록 설계하였다. 충격 해머 속도에 따른 충격 하중을 제어하기 공압 제어 장치를 설계하였다. 개발된 충격 모사장치를 적용하여 충격 해머 속도 제어를 통한 성능 시험을 수행하였으며, 충격 응답 구현에 대한 반복성이 우수한 것을 확인하였다. 또한 개발된 충격 모사장치의 충격 응답 특성을 분석하기 위해 모드시험과 유한요소 해석을 수행하였으며, 이를 바탕으로 개선안을 제시하였다 Space instrument must be verified to confirm its capability to withstand the severe mechanical loads and shock environment during launch process by rocket. Generally, the shock environment is generated by pyrotechnic device employed for spacecraft separation, fairing separation and solar array deployment. These shock loads can cause severe damage on electronics of space equipment. So, equipment should be tested to assure its functionality under shock loading condition prior to space flight. Generally, equipment shock test is performed by subjecting the equipment to shock environment which occurs in resonant structure excited by mechanical impact. In this study, circular resonant type pyroshock simulator was developed for large electronic component used in spacecraft. A circular resonator is applied to control the knee frequency of shock spectrum and to generate the uniform response at test bed in circular direction. To control the shock level by impact hammer velocity, air loading device was developed for impact hammer. The developed system was tested to know the performance by controlling impact hammer velocity and was also verified to have a good repeatability on shock signal generation. To investigate the characteristics of the simulator, modal test and FEM analysis were performed. Based on the knowledge of the developed system, the modified design was suggested to satisfy the shock test requirement.

3-병렬 수직 가진 시스템 개발

임종민,문상무,은희광,최석원 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-

지하 공동구 적용 지능형 LED조명 등기구 조도 분석 및 저조도 카메라의 시인성 측정에 관한 연구

임종민,유성식,신진수,신상욱 한국조명.전기설비학회 2023 조명·전기설비학회논문지 Vol.37 No.5

This paper analyzed adaptability optical performance of an intelligent LED lighting fixture capable of variable CCTs (3,000K, 5,000K) replacing a fluorescent lighting fixture applied in a underground common duct. In addition, visibility of a camera was tested under a low light condition to save energy. As a result of simulation using the IES File of the LED fixture generated by light distribution measurement, the average illuminance of the LED fixture was improved by about 2 times compared to that of the existing fluorescent lighting fixture. In addition, the installation distance between the LED fixtures was increased from the current 5m up to 10m to save more energy. The visibility of the camera image was confirmed by two methods of adjusting the distance under the same low illumination condition and the illumination adjustment method.

ITS2 염기서열 분석에 의한 감초 종(Glycyrrhiza spp.) 분류 및 유통 감초한약재의 원산지 판별

임종민,안영섭,박춘근,박충범,조준형 한국국제농업개발학회 2012 韓國國際農業開發學會誌 Vol.24 No.4

This study was conducted to identify the origines of Licorice (Glycyrrhiza spp.) traded as medicines in herb market. For these purpose, morphological characteristics and sequence of nrDNA and cpDNA among Glycyrrhiza spp. plants as follows; G. uralensis and G. glabra L. are used as medicines,however, Korean domestic G. pallidiflora is not used as medicine. In morphology, leaf and root shape among the plant were different. Especially, leaf shapes of G. uralensis and G. glabra L. were egg and oval shape, however, that of G. pallidiflora were lanceolate shape with higher leaf length/width ratio than other plants. An also in colors of the roots, white were shown in Chinese and Korean products, otherwise, off-white in Uzbekistan. In molecular studies of cpDNA, G. uralensis and G. glabra were not distinguished by rpoB2 and rpoC1 and only one SNP was shown by psbA-trnH. However, in 450 bp sequences amplified by ITS2, specific SNP were shown in 98, 99, 100 and 137, 161, 164, 203, 296 regions produced in G. glabra and G. pallidiflora, respectively. And these were presumably used as molecular markers for discriminating Glycyrrhiza spp.. Also in phylogenetic analysis, it was identified that the genetic relations between G. uralensis and G. glabra, which were used as medicines, were closer than to G. pallidiflora. By applying the results to traded herb materials, Chinese and Korean medicinal herbs are accordance with G. uralensis where as Uzbekistan medicinal herb is G. glabra. In results, molecular analysis by using ITS2was useful to identify the origines of medicinal herb, Glycyrrhiza spp. traded in herb market. 본 연구는 국내 유통 감초약재의 원산지 판별을 위해 수행되었다. 이를 위해 약재로 쓰이는 만주감초(Glycyrrhiza uralensis) 및 유럽감초(G. glabra)와 약재로 사용되지 않는 국내 자생종 개감초(G. pallidiflora) 식물의 형태적 차이 및 엽록체와 핵 DNA 구간의 염기서열의 차이를 구명하였다. 감초식물 3종의 형태적 특징을 비교한 결과, 잎과 뿌리에서 차이를 보였다. 특히 잎의 형태에 있어서 중국감초와 유럽감초는 난형 혹은 타원형인 반면, 개감초는 엽장/엽폭비가 큰 피침형이었다. 또한 건조된 뿌리로 시중되는 감초 한약재의 경우, 중국산과 한국산은 백색인 반면 우즈베키스탄산은 황백색이었다. 감초식물 3종을 대상으로 DNA 수준에서의 차이를 비교한 결과 rpoB2, rpoC1에서는 G. uralensis와 G. glabra가 구분되지 않았으며, psbA-trnH의 경우 단 한 구간의 SNP에서 차이를 보였다. 반면 ITS2에 의해 증폭된 450bp의 염기서열을 비교한 결과, G. glabra는 98, 99, 100번째 위치에서, G. pallidiflora는 137, 161, 164, 203, 296위치에서 감초 종간 판별을 위한 특이적 SNP가 확인되었다. 또한, phylogenetic tree 분석을 통해, 약재로 쓰이는 G. uralensis과 G. glabra는 약재로 쓰이지 않는 G. pallidiflora에 비하여 유전적 거리가가까움을 확인하였다. 본 표준시료에서 얻은 결과를 유통 한약재 원산지 판별에 적용한 결과, 중국산과 한국산의 한약재는 G. uralensis와 염기서열이 일치하였고, 우즈베키스탄으로부터 수입된 한약재는 G. glabra와 염기서열이 일치됨을 확인하였다. 이에 감초의 생체 및 한약재의 원산지 판별을 위해 ITS2를 이용한 분자수준에서의 판별이 유용하다고 판단된다.

ZnO 성장을 위한 Atomic Layer Deposition법에서 공정온도가 박막의 구조적 및 광학적 특성에 미치는 영향

임종민,이종무,Lim, Jong-Min,Lee, Chong-Mu 한국재료학회 2005 한국재료학회지 Vol.15 No.11

Atomic layer deposition (ALD) is a very promising deposition technique for ZnO thin films. However, there have been very few reports on ZnO grown by ALD. Effects of substrate temperature in both ALD and post annealing on the microstructure and PL properties of ZnO thin films were investigated using X-ray diffraction, photoluminescence, and scanning electron microscopy. The temperature window of ALD is found to be between $130-180^{\circ}C$. The growth rate of ZnO thin film increases as the substrate temperature increases in the temperature range except the temperature window. The crystal quality depends most strongly on the substrate temperature among all the growth parameters of ALD. The crystallinity of the film is improved by increasing the growth thine per ALD cycle or doing post-annealing treatment. The grain size of the film tends to increase and the grain shape tends to change from a worm-like longish shape to a round one as the annealing temperature increases from $600^{\circ}C\;to\;1,000^{\circ}C$.

ZnO ALE를 위한 Si, sapphire기판의 ECR 플라즈마 전처리

임종민,신경철,이종무,Lim Jongmin,Shin Kyoungchul,Lee Chongmu 한국재료학회 2004 한국재료학회지 Vol.14 No.5

Recently ZnO epitaxial layers have been widely studied as a semiconductor material for optoelectronic devices. Sapphire and silicon are commonly selected as substrate materials for ZnO epitaxial growth. In this communication, we report the effect of the ECR plasma pretreatment of sapphire and silicon substrates on the nucleation in the ZnO ALE (atomic layer epitaxy). It was found that ECR plasma pretreatment reduces the incubation period of the ZnO nucleation. Oxygen ECR plasma enhances ZnO nucleation most effectively since it increases the hydroxyl group density at the substrate surface. The nucleation enhancing effect of the oxygen ECR plasma treatment is stronger on the sapphire substrate than on the silicon substrate since the saturation density of the hydroxyl group is lower at the sapphire surface than that at the silicon surface.

대형 멀티 전자기 가진 시스템 개발

임종민,은희광,문상무,이동우,문남진,최석원 한국항공우주학회 2007 한국항공우주학회 학술발표회 논문집 Vol.- No.-

전해 크롬도금 대체용으로서의 CrC 스퍼터링에 관한 연구

임종민,최균석,이종무,Im, Jong-Min,Choe, Gyun-Seok,Lee, Jong-Mu 한국재료학회 2002 한국재료학회지 Vol.12 No.1

Chromium carbide films were deposited on high speed steels using a Cr_3C_2$ target by magnetron sputtering. Effects of the deposition parameters (power, Ar pressure and substrate temperature) on deposition rates and surface roughnesses of the films were investigated. The morphologies of those films were characterized by scanning electron microscopy and atomic force microscopy. The grain size of the samples deposited using dc-power is larger than that using equivalent rf-power. The hardness of the sample increases with increasing rf-power, whereas the elastic modulus nearly does not change with rf-power. The optimum sputter deposition conditions for chromium carbide on high speed steels in the corrosion resistance aspect were found to be the rf-power with small roughness.