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이기거풍산(理氣祛風散)이 백서(白鼠)의 신경병리성(神經病理性) 동통(疼痛) 억제(抑制) 및 c-Fos 단백(蛋白) 발현(發顯)에 미치는 영향(影響)
이혁재,김종한,박수연,최정화,Lee, Hyek-Je,Kim, Jong-Han,Park, Su-Yeon,Choi, Jung-Hwa 대한한방안이비인후피부과학회 2005 한방안이비인후피부과학회지 Vol.18 No.1
Objective : We have studied to know effects of Ligigeopoongsan(LGS, 理氣祛風散) on mechanical allodynia, cold allodynia and c-Fos protein expression in the model of neuropathic pain of rats. Methods : The model of neuropathic pain was made by injured tibial nerve and sural never while common peroneal never was maintained. After 2weeks, we performed behavioral test for 7 days to try out mechanical allodynia using von frey filament and cold allodynia using acetone, which are calculated by counting withdrawal response on foot. Rat brains removed and sliced on 8th days. Serial sections were immunohistochemically reacted with polyclonal c-Fos antibody. The numbers of c-Fos protein immunoreactive neurons in the central gray were examined using scion image program. Results : 1. Mechanical allodynia in LGS-2, LGS-3 groups were significantly diminished compared with the control group. 2. Cold allodynia in LGS-3 group was significantly diminished compared with the control group. 3. c-Fos protein expression on the central gray LGS-2, LGS-3 groups were significantly lower than that of control group. conclusions : We have noticed that LGS(理氣祛風散) diminished mechanical and cold allodynia in the model of neuropathic pain compared with the control group. c-Fos protein expression in the central gray of that group was also decreased compared with the control group. Pain control group were LGS was accumulated time goes by. This study can be used as a basic resource on a study and a treatment of pain.
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Arena 시험을 위한 영상처리 기반 탄두 파편 검출 기법
이혁재,정찬호,박용찬,박웅,손지홍 한국군사과학기술학회 2019 한국군사과학기술학회지 Vol.22 No.5
The Arena Fragmentation Test(AFT) is one of the important tasks for designing a high-explosive warhead. Inorder to measure the statistics of a warhead in the test, fragments of a warhead that penetrate steel plates aredetected by using complex and expensive measuring equipment. In this paper, instead of using specific hardware tomeasure the statistics of a warhead, we propose to use an image processing based object detection algorithm todetect fragments in AFT. To this end, we use a hard-thresholding method with a brightness feature and apply amorphology filter to remove noise components. We also propose a simple yet effective temporal filtering methodto detect only the first penetrating fragments. We show that the performance of the proposed method iscomparable to that of a hardware system under the same experimental conditions. Furthermore, the proposedmethod can produce better results in terms of finding exact positions of fragments.
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Functional Schr¨odinger Picture Formalism for Pairing Correlations
이혁재,천명기 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.5
To study some collective phenomena in nuclear physics, we have to understand the pairing correlation due to residual short-range correlations among the nucleons in the nucleus. This has usually been calculated by using the Bardeen-Coorper-Schrieffer theory or the Hartree-Fock-Bogoliubov theory. We introduce another approximation procedure that can be compared with those theories. We show that our approximation formalism can be applied to the nuclear shell model and is related to the Hartree-Fock-Bogoliubov approximation. To study some collective phenomena in nuclear physics, we have to understand the pairing correlation due to residual short-range correlations among the nucleons in the nucleus. This has usually been calculated by using the Bardeen-Coorper-Schrieffer theory or the Hartree-Fock-Bogoliubov theory. We introduce another approximation procedure that can be compared with those theories. We show that our approximation formalism can be applied to the nuclear shell model and is related to the Hartree-Fock-Bogoliubov approximation.
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이혁재,Lee, Hyuk-Jae 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.1
In this study, new multi-axial, critical plane based, fretting fatigue crack initiation parameter is developed by the addition of a new term into the Modified Shear Stress Range(MSSR) parameter. The newly developed parameter (MSSR') is then used to evaluate fretting fatigue life of titanium alloy, Ti-6A1-4V with various contact conditions. Finite element analysis is also used in order to obtain stress distribution on the contact surface during fretting fatigue test, which is then used for the calculation of fretting fatigue parameter. The MSSR' parameter shows better performance in predicting fretting fatigue lives from the conventional fatigue data, and less scattering within fretting fatigue data with different contact geometries.
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이혁재,박영철,윤대희 한국통신학회 2000 한국통신학회논문지 Vol.25 No.6
본 논문에서는 비정수배 과표본화(fractional ratio oversampling) 구조를 위한 DFT 기반의 폴리페이즈 필터뱅크를 제안하였다. 비정수배 과표본화는 임계표본화(critical sampling)보다 적은 에일리어징을 가지며 동시에 정수배과표본화(integer ratio oversampling)보다 적은 계산량을 갖는다. 또한 비정수배 과표본화의 에일리어징 감소효과로 인해 필터뱅크 설계에 자유도가 높아진다. 제안된 비정수배 과표본화 폴리페이즈 구조를 서브밴드 적응필터에 응용하여 긴 적응필터를 필요로 하는 음향반향 제거 실험을 수행하였다. 반향제거 실험결과 비정수배 과표본화는 정수배 과표본화보다 적은 계산량으로 유사한 성능을 보였다.
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이혁재,Lee, Hyuk-Jae 한국자기학회 2007 한국자기학회지 Vol.17 No.1
양자얽힘 상태를 만들어내는 것은 매우 중요하다. 근거리에 있는 두 계를 양자얽힘 상태로 만드는 것은 그리 어렵지 않으나 직접 상호작용이 불가능 할 정도로 멀리 떨어져서 고정되어 있는 계들을 양자적으로 얽히게 하는 것은 어려운 문제 중의 하나다. 본 논문에서는 먼 거리에 떨어져있는 스핀-1/2입자들 사이에 양자얽힘 상태를 직접적인 상호작용이 아니라 제 삼의 스핀-l/2를 이용하여 생성할 수 있다는 것을 보였다. 상호작용으로는 $F\"{o}rster$ 상호작용과 스핀-스핀 교환 상호작용을 사용하였다.
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