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Performance of 3D printed plastic scintillators for gamma-ray detection
Kim, Dong-geon,Lee, Sangmin,Park, Junesic,Son, Jaebum,Kim, Tae Hoon,Kim, Yong Hyun,Pak, Kihong,Kim, Yong Kyun Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.12
Digital light processing three-dimensional (3D) printing technique is a powerful tool to rapidly manufacture plastic scintillators of almost any shape or geometric features. In our previous study, the main properties of light output and transmission were analyzed. However, a more detailed study of the other properties is required to develop 3D printed plastic scintillators with expectable and reproducible properties. The 3D printed plastic scintillator displayed an average decay time constants of 15.6 ns, intrinsic energy resolution of 13.2%, and intrinsic detection efficiency of 6.81% for 477 keV Compton electrons from the <sup>137</sup>Cs γ-ray source. The 3D printed plastic scintillator showed a similar decay time and intrinsic detection efficiency as that of a commercial plastic scintillator BC408. Furthermore, the presented estimates for the properties showed good agreement with the analyzed data.
Kim, Ki-Rak,Kim, Gibaek,Kim, Ju-Yong,Park, Kihong,Kim, Kyoung-Woong The Royal Society of Chemistry 2014 Journal of analytical atomic spectrometry Vol.29 No.1
<P>Laser induced breakdown spectroscopy (LIBS) was used to determine Zn concentrations in various types of soils, and discarding and kriging interpolation methods were combined to enhance the accuracy and precision of the LIBS analysis. In order to determine Zn concentrations in 10 field soils, the discarding method was used for pre-treatment of LIBS data acquisition. A remarkable decrease of relative standard deviation was observed indicating a significant increase of pulse-to-pulse precision. Nine artificial soil sets containing different contents of sand, kaolin, and goethite were manufactured for the interpolation database, and they displayed differing LIBS broadband spectra due to their respective sample matrices. In addition, the calibration slope of each soil set varied significantly showing up to a 3.36-fold difference. We found that the matrix effect derived from sand, kaolin, and goethite contents can be determined by detecting major elements in soil (Si, Al, and Fe) from LIBS analysis without additional measurements. The kriging interpolation model was applied using the database obtained from the artificial soil sets. The concentration of Zn in field soils calculated from data treatment methods showed significantly accurate results when compared to ICP-OES analysis results. By minimizing factors affecting the LIBS result, heavy metal concentrations in various types of soils can be determined using a developed database without calibration.</P> <P>Graphic Abstract</P><P>Laser induced breakdown spectroscopy (LIBS) was used to determine Zn concentrations in various types of soils, and discarding and kriging interpolation methods were combined to enhance the accuracy and precision of the LIBS analysis. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3ja50233c'> </P>
상 변화와 인터페이스 이론을 이용한 고에너지물질의 반응연구
김기홍(Kihong Kim),김학준(Hakjun Kim),김형원(Hyoungwon Kim),여재익(Jai-ick Yoh) 한국추진공학회 2008 한국추진공학회 학술대회논문집 Vol.2008 No.11
고에너지 물질의 상변화는 연소과정에서 발생하는 필연적으로 중요한 요소이다. 연소과정에서 발생한 고온, 고압의 가스는 주변의 물질과 상호작용을 통해 복잡한 현상을 일으키게 된다. 본 연구에서는 고에너지 물질의 상변화를 해석을 하기 위한 기초 연구로 상변화 변수를 이용하여, 증기 폭발을 해석하였다. Phase change in combustion of energetic materials happens inevitably. The product gas generated by combustion is at extreme temperature and pressure state. The interaction between a gas and metal generates high strain rate deformation and complex wave phenomena. In order to perform combustion simulation containing phase changes, we develop an elegant model for phase change and provide a proof of performance via vapor explosion example.
김기홍(Kihong Kim),이경철(Kyung-Cheol Lee),곽민철(Min-Cheol Gwak),김용현(Yong-Hyeon Kim),도영대(Young-Dae Doh),김창기(Chang-Kee Kim),유지창(Ji-Chang Yoo),여재익(Jai-Ick Yoh) 한국추진공학회 2009 한국추진공학회 학술대회논문집 Vol.2009 No.11
고체 로켓 추진제로 널리 사용되는 물질은 AP/HTPB 복합추진제이다. 고체 로켓 주위에 열 하중이 가해진다면(화재 등) 추진제가 발화할 수 있고, 사고의 원인이 된다. 본 연구에서는 AP/HTPB 복합추진제의 주위에 열 하중을 가함으로써 AP/HTPB의 발화특성을 확인해 보았다 The AP/HTPB composite propellant is a common choice for solid rocket propulsion. The externally heated rocket via fires, for instance, can cause the energetic substance to ignite, and this may lead to a thermal runaway event marked by a severe explosion. In order to develop preventive measures to reduce the possibility of such accidents in propulsion systems, we investigate the ignition and initiation properties of AP/HTPB propellant.
Adaptive Line Fitting을 이용한 실시간 자동 외관 검사
김기홍(KiHong Kim),정연구(YunKoo Chung),김용(Yong Kim),김현빈(HyunBin Kim),송재우(JaeWoo Song) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.2Ⅱ
자동차 조립 생산라인에서 수밀 검사를 원할하게 수행하기 위해서 차량의 모든 문들의 개폐여부를 자동적으로 검사하는 시스템을 개발하였다. 검사를 수행하는 동안 카메라로 입력된 영상은 생산 현장의 여러 가지 변화요인으로 인해 해석하기가 용이하지 않아서 인위적으로 만든 라인 형태의 할로겐 조명에 기반한 에지 검출 알고리듬과 잡음에 의한 간섭을 줄이고자 데이터에 대한 필터링을 통해 이를 극복하였다.
Beam line design and beam transport calculation for the μSR facility at RAON
Pak, Kihong,Park, Junesic,Jeong, Jae Young,Kim, Jae Chang,Kim, Kyungmin,Kim, Yong Hyun,Son, Jaebum,Lee, Ju Hahn,Lee, Wonjun,Kim, Yong Kyun Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.10
The Rare Isotope Science Project was launched in 2011 in Korea toward constructing the Rare isotope Accelerator complex for ON line experiments (RAON). RAON will house several experimental systems, including the Muon Spin Rotation/Relaxation/Resonance (μSR) facility in High Energy Experimental Building B. This facility will use 600-MeV protons with a maximum current of 660 pμA and beam power of 400 kW. The key μSR features will facilitate projects related to condensed-matter and nuclear physics. Typical experiments require a few million surface muons fully spin-polarized opposite to their momentum for application to small samples. Here, we describe the design of a muon transport beam line for delivering the requisite muon numbers and the electromagnetic-component specifications in the μSR facility. We determine the beam-line configuration via beam-optics calculations and the transmission efficiency via single-particle tracking simulations. The electromagnet properties, including fringe field effects, are applied for each component in the calculations. The designed surface-muon beamline is 17.3 m long, consisting of 2 solenoids, 2 dipoles affording 70° deflection, 9 quadrupoles, and a Wien filter to eliminate contaminant positrons. The average incident-muon flux and spin rotation angle are estimated as 5.2 × 10<sup>6</sup> μ<sup>+</sup>/s and 45°, respectively.
Kim, Kihong 평택대학교 2005 論文集 Vol.19 No.-
본 연구의 목적은 소비자들의 특급호텔에 대한 직간접 경험에 의해서 고품격 서비스에 대한 기대가 동일호텔의 외식업체에 대한 서비스 품질의 기대와 실제의 지각된 만족도와 서비스를 수행하여야 하는 종사원의 서비스의 중요도에 대한 인식 및 수행도를 고객과 종사원에 대하여 같은 외식업체를 대상으로 설문함으로써 조사하여 서비스품질 인식의 차이를 확인하고, 개선하고자 함에 있다. 연구의 목적은 첫째, 서비스의 구성요소 별로 고객이 기대하고 지각하는 서비스의 차이를 알아보고, 둘째, 실질적인 서비스를 수행하는 종사원들의 호텔과 외식업체의 서비스 수행의 차이에 대한 문제점과, 셋째, 이를 최소화함으로써 고객의 기대에 부응하여 최대한 만족을 주기 위한 개선점을 찾고자 함이 본 연구의 목적이다. 연구결과를 보면 특 1급 호텔의 외식업체에서 제공된 서비스에 대해 고객이 지각하는 서비스 정도와 종업원이 실제로 수행하는 정도에 있어서 고객이 지각하는 서비스와 종사원이 실제로 제공하는 서비스사이에는 큰 차이가 있는 것으로 나타났으며, 호텔의 서비스와 마찬가지로 특 2급 호텔의 외식업체보다는 특 1급 호텔 외식업체가 보다 높은 수준의 서비스품질을 제공하고 있는 것으로 이해할 수 있다. 호텔의 외식업체가 호텔과 동일한 서비스품질을 유지하고, 관리하기 위해서는 위에서 언급된 사항에 대하여 보완이 필요하며 이를 실행하여야만 호텔외식업체의 이용 고객의 기대와 실제 서비스를 수행하는 외식업체의 차이가 접점을 이룸으로써 고객이 지각하는 서비스의 만족을 이루어짐으로 인하여 고객만족을 통한 고객의 삶에 대한 질의 향상과 고객의 재방문에 의해 기업의 궁극적인 이익의 극대화가 실현될 것이다. The purpose of this study was to present the direction for improvement of the foodservice business of the hotel. For this purpose, this study attempted to investigate the level of customer expected service quality of and actually perceived satisfaction with the foodservice business of the hotel and the awareness of employees that should offer service to customers and identify the difference in the perception of service quality. The implications can be summarized as follows: Most hotel foodservice business, unlike hotels, do not have direct possession of real property but temporarily use it through lease or management on consignment and the like. Therefore, they should make investment in plant and equipment in preparation for the case that the lease contract is not renewed due to its limited period. But they make insufficient investment in plant and equipment. And in the department of service manpower, it is necessary to secure proper service manpower, strive for employee education and training and provide identity security for employment of hotel employees.