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Measurement of a 2-MeV Electron Beam Flux by Using an Aluminum-Nitride Detector
Byung Moon,Changhie Hahn,David Holcomb,유동선,Ilgon Kim,Yoon Cho 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.5
A small aluminum-nitride detector of 3 mm $\times$ 3 mm $\times$ 0.387 mm in size fabricated at the Oak Ridge National Laboratory is used to measure the 1 MeV $\sim$ 2 MeV electron beam from a beam facility at the Korea Atomic Energy Research Institute. Our objective is to check the linearity of the generated electric current relative to the electron beam intensity and to see if the electric current generated can be used as a measurement of the flux intensity. The results show that if the electric voltage applied to the detector is 2,000 V or higher and if the data are taken in a sufficiently short period of time so that the heat build up inside the detector is negligible, then the measured electric current increases linearly as the flux intensity increases. Hence, the measured value can be used as an estimate of the flux intensity, provided that one prior measurement of the beam with the given energy is available.
Sang Hoon Jeon,Soonyoung Lee,Sanghyeon Baeg,Ilgon Kim,Gunrae Kim IEEE 2014 IEEE transactions on nuclear science Vol.61 No.5
<P>This paper explores the effectiveness of error detection schemes in increasingly multiple-cell upset-dominant technologies, specifically SRAM. A review of interleaving distance, parity codes, and well-taps is conducted to examine each attribute. Then, the paper proposes a novel error detection scheme with the harmonious use of the multiple-cell upset inhibition effects of well-taps, the detectability of parity codes, and an interleaving distance scheme to create an effective error detection scheme that is both flexible and has a high implementation prospect. A row depth model is created to assess the effectiveness of the proposed scheme. The model shows that advanced technologies with greater multiple-cell upset sizes and ratios will experience error detection failures with schemes such as single error correction-double error detection, whereas the proposed scheme remains effective. Experimental data supports the premise that well-taps inhibit multiple-cell upset, as it is found that 1% cross well-taps. The proposed scheme is recognized to be at least three times better against error detection failures than single error correction-double error detection.</P>
Fabrication of a GEM Detector and Its Signal Readout with a Homemade Readout Board
Seongtae Park,Changhie Hahn,Byungsoo Moon,Chongeun Jung,유동선,Ilgon Kim,Kiwan Jang 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.5
The gas electron multiplier (GEM) chamber fabricated in this experiment had a double GEM structure, and Ar and CO$_2$ gases were used as the counting and the quencher gases, respectively, with a mixing ratio of Ar : CO$_2$ = 80 : 20. A homemade readout board was used to read the electric signals from the GEM detector. The analog-to-digital converter (ADC) was synchronized with the trigger signal, and the converted digital values were fed to a personal computer (PC) by the data acquisition (DAQ) program. The whole detector system was tested with an Fe-55 radiation source (5.9 keV), and we calculated the mass attenuation coefficients for a Cu and an Ar/CO$_2$ gas mixture under 5.9 keV X-ray irradiation. From the results, we found that the Cu film (cathode) played an important role in the signal generation.
Seongjin Cho,Dongkyu Park,Taewoo Kwon,Dongsun Yoo,Ilgon Kim 한국진공학회(ASCT) 2002 Journal of Korean Vacuum Science & Technology Vol.6 No.1
Polymer EL devices of glass/ITO/PI/MEH-PPV/Al structure were fabricated using spin coating and the Ionized Cluster Beam deposition technique. PMDA-ODA type thin polyimide films which can be used as a impurity blocking layer of EL device were deposited by ICB. According to our previous results, the packing densities of polyimide films were subject to change and depend on their deposition condition. By inserting a Pl layer with various thickness and packing density, I-V characteristics and life time of the devices were investigated to determine the role of a interlayer. The blocking of impurity diffusion from ITO to luminescent layer were confirmed by XPS.
Fabrications and photoluminescence of Sm2+ -doped aluminosilicate thin films
Yonghwa Chung,Kiwan Jang,Eunjin Cho,HyoJin Seo,Ilgon Kim,Sangsu Kim,Seongtae Park,Weiping Qin,Yong-Ill Lee 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.I
Sm2+-doped 10Al2O390SiO2 thin lms were prepared by coating on Al-deposited Si(100) wafers with a sol solution and heating in air, as well as in a H2 atmosphere. The prepared thin films were examined with a scanning electron microscope for observing their morphologies, and the photoluminescence spectra of Sm2+ ions were measured. The morphologies of the thin lms were found to be highly dependent upon the samarium precursors and the emission peaks due to the 5D0 ! 7F0 transitions of Sm2+ ions were highly dependent on the reduction processes of the Sm3+ ions and the samarium precursors.
김일곤 ( Kim¸ Il-gon ) 미래융합통섭학회 2021 현대사회와 안전문화 Vol.4 No.2
연구목적 이 연구는 '재난·재해 발생 지역에서의 드론 활용 체계 구성 요인은 무엇인지'에 대한 고찰 연구이다. 연구 방법 일본 드론 활용 전문가 10인(재난5인, 인프라점검5인)을 대상으로 온라인 심층면담을 실시하였으며, 질적 연구방법인 근거이론을 토대로 NVivo12를 활용한 텍스트 및 문장 데이터의 분류 및 시각화 과정을 통해 질적 연구분석을 하였으며, 마인드맵 채점기준을 활용하여 프로젝트맵의 타당성을 높였다. 결론 첫째, 전문 인력은 드론 비행 역량(58.9%, 4노드), 드론 기자재 관리 역량(51.1%, 3노드), 둘째, 활용 기술은 피해지역 분석 기술(63.7%, 3노드), 정보 공유 기술(46.3%, 2노드), 셋째, 드론 운영은 지원 물자 배송(42.8%, 3노드), 안전 비행(28.9%, 2노드), 지방자치 단체 행정 지원(28.3%, 2노드)으로 부호화 되었다. 또한 도출된 결과를 토대로 한 논의사항은 첫째, 비전문인력의 교육을 통한 전문인력 양성 체계 모색, 둘째, 다양한 소프트 웨어 활용을 통한 피해 정보의 시각화 체계 모색, 셋째, 지원 물자 배송을 위한 운영 체계의 구축 모색, 넷째, 드론 활용의 일상화를 위한 행정 지원과 정책 개선이다. PURPOSE This is a study of a consideration on ‘what about the constitutional factors of a drone utilization system in area with occurrence of disaster and calamity?.’ METHOD An online in-depth interview was conducted targeting 10 Japanese experts in drone application(5 people for disaster, 5 people for infrastructure inspection). A qualitative research analysis was carried out through the process of classifying and visualizing the text & sentence data with application of NVivo12 based on a grounded theory that is a qualitative research method. The validity of a project map was increased by using the scoring rubric for a mind map. CONCLUCLUSION First, the professional manpower was encoded with the drone flight competence(58.9%, 4 nodes) and the drone equipment & material management capacity(51.1%, 3 nodes). Second, the application technology was encoded with the damage area analysis technology(63.7%, 3 nodes) and the information sharing technology(46.3%, 2 nodes). Third, the drone operation was encoded with the support material delivery(42.8%, 3 nodes), the safe flight(28.9%, 2 nodes), and the local government administrative support(28.3%, 2 nodes). Also, the discussions based on the elicited results include, first, finding a system for training professionals through educating non-professional personnel, second, exploring the visualization system of damage information through using a variety of softwares, third, seeking to establish an operating system for the support material delivery, and fourth, improving the administrative support & policy for routinizing drone utilization.