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정원모,주관식,황한렬,정원균 연세대학교 자연과학연구소 1986 學術論文集 Vol.17 No.-
동일한 선원에 대한 감마-감마, 감마-내부전환전자 각상관관계 실험을 통하여 변형핵인 ^152Sm의 혼합비(δ)와 121.8keV전이의 내부 전환전자 입자매개변수(b_2)를 결정하였다. 감마선을 검출하는데는 두대의 Ge(Li)검출기를 내부전환전자를 검출하는 데는 표면장벽형검출기를 사용하였다. 실험을 통하여 다음과 같은 결과를 구하였다. 244.7 keV-121.8 keV ; δ =-0.012±0.007 688.6 keV-121.8 keV ; δ =17.4±3.01 964.0 keV-121.8 keV ; δ =9.51±1.93 1112.0 keV-121.8 keV ; δ =12.30±2.05 1408.0 keV-121.8 keV ; δ =0.16±0.07 964.0 keVγ-121.8 keVe_K ; b_2=1.66±0.26 1408.0 keVγ-121.8 keVe_K ; b_2=1.63±0.10 1408.0 keVγ-121.8 keVe_L ; b_2=0.99±0.13 혼합비는 PPQ(Pairing-Plus-Quadrupole)모델과 IBA(Interacting-Boson-Approximation)모델로부터 얻은 이론값과 비교하여 보았고 또한 입자매개변수값이 이론값과 큰 차이가 있는 것으로 보아 변형핵의 저에너지 E_2 전이에서 ‘anomaly’가 있는 것으로 추정된다. The mixing ratios (δ) and the internal conversion electron particle parameters (b_2) of the 121.8keV transition in deformed ^152Sm nuclei were determined by comparing the γ-γ and γ-e angular correlation measurements made with the same source. The experimental apparatus was constructed with a surface barrier detecter for electrons and two Ge(Li) detectors for gamma rays. The following results were obtained. 244.7 keV-121.8 keV ; δ =-0.012±0.007 688.6 keV-121.8 keV ; δ =17.4±3.01 964.0 keV-121.8 keV ; δ =9.51±1.93 1112.0 keV-121.8 keV ; δ =12.30±2.05 1408.0 keV-121.8 keV ; δ =0.16±0.07 964.0 keVγ-121.8 keVe_K ; b_2=1.66±0.26 1408.0 keVγ-121.8 keVe_K ; b_2=1.63±0.10 1408.0 keVγ-121.8 keVe_L ; b_2=0.99±0.13 The results are compared with the theoretical values derived from the Pairing-Plus-Quadrupole model and from the Interacting-Boson-Approximation model, and an 'anomaly' was found in the low-lying E_2 transition for deformed ^152Sm nuclei.
Detection of Emergency Disaster using Human Action Recognition based on LSTM Model
Yull Kyu Han,Young Bok Choi 대한전자공학회 2020 IEIE Transactions on Smart Processing & Computing Vol.9 No.3
We propose a deep learning model for human action recognition in order to identify quickly the location and occurrence of disasters such as fire and terrorism. Using the acceleration and gyroscope sensors built in the smartphone, we obtained data on human behavior and we classified human behavior through the LSTM deep learning model. There are four categories of human behavior, usually stopping, walking and running, and running helter-skelter in the event of a disaster. We compared analysis of four types of human behavior data such as stop, walking, running, and running helter-skelter, with the existing NN model and the LSTM model proposed in this paper. As a result, we confirmed that the LSTM model can be classified more accurately than the NN model with 81.50% for the conventional NN model and 95.32% for the LSTM model. We expect that the proposed model can be used to detect disaster occurrences quickly.
Study of Fraction of Delayed Events in the Activity Determination of ^75Se
Hwang, Han Yull 목원대학교 자연과학연구소 1993 自然科學 硏究論文集 Vol.2 No.1
본 연구는 ^75Se의 방사선 붕괴 과정에서 나타나는 ^75As의 304 keV Isomeric State에 의한 지연계수율을 결정하기 위한 BIPM의 국제비교 목적으로 수행하였다. 4π(e^-, x)-γ 동시측정과 이론적 계산을 통하여서는 자연계수에 관하여 충분한 연구를 하였다. 결론적으로 γ channel gate의 에너지 영역을 340 keV에서 470 keV로 선택한 경우, 지연계수율은 (7.4±1.2)% 로 관측되었다. The present work has been carried out according to the International Comparision program for ^75Se fo BIPM in order to verify the fraction of the delayed events due to the presence of a 304 keV isomeric state during the decaying process of ^75Se. Both 4π(e^-, x)-γ coincidence measurement and theoretical calculations have been fully developed at this work. As a consequence, that fraction is determined to be (7.4±1.2)% when the γ channel gate is set on the energy region 340 keV to 470 keV.
Hwang, Han Yull,Lee, Jong Man The Korean Association for Radiation Protection 2020 방사선방어학회지 Vol.45 No.2
Background: To improve the measurement accuracy of liquid-scintillation counting for activity standardization, it is necessary to significantly reduce the background caused by thermal noise or after-pulses. We have therefore improved a movable 3 photomultiplier (3PM)-γ coincidence-counting method using the logical sum of three double coincidences for β events. Materials and Methods: We designed a new data-acquisition system in which β events are obtained by counting the logical sum of three double coincidences. The change in β-detection efficiency can be derived by moving three photomultiplier tubes sequentially from the liquid-scintillation vial. The validity of the method was investigated by activity measurement of <sup>134</sup>Cs calibrated at the Korea Research Institute of Standards and Science (KRISS) with 4π(PC)β-γ(NaI(Tl)) coincidence counting using a proportional counter (PC) for the β detector. Results and Discussion: Measurements were taken over 14 counting intervals for each liquidscintillation sample by displacing three photomultiplier tubes up to 45 mm from the sample. The dead time in each β- and γ-counting channel was adjusted to be a non-extending type of 20 ㎲. The background ranged about 1.2-3.3 s<sup>-1</sup>, such that the contributions of thermal noise or after-pulses were negligible. As the β-detection unit was moved away from the sample, the β-detection efficiencies varied between 0.54 and 0.81. The result obtained by the method at the reference date was 396.3 ± 1.7 kBq/g. This is consistent with the KRISS-certified value of 396.0 ± 2.0 kBq/g within the uncertainty range. Conclusion: The movable 3PM-γ method developed in the present work not only succeeded in reducing background counts to negligible levels but enabled β-detection efficiency to be varied by a geometrical method to apply the efficiency extrapolation method. Compared with our earlier work shown in the study of Hwang et al. [2], the measurement accuracy has much improved. Consequently, the method developed in this study is an improved method suitable for activity standardization of β-γ emitters.
Hwang,Han Yull 牧園大學校 1991 論文集 - 牧園大學校 Vol.19 No.-
Main objects of the present work is lying at the investigation of the hexadeca-pole effects on the collective excitations in the region of Os and Pt isotopes. It was attempted by carrying out calculation of the B(E2) values with taking into accounts , effects on the basis of ARM. All of the possible transitions from spin 2 to up to 10 state were investigated. As a consequence, , effect, as a general trends, seems to prohibit the M1 transition probability caused by the breaking of symmetry. More detaily speaking in the viewpoint of IBA model, when the , are considered, not only B(E2) values are enhanced for allowed transitions △= ± 1, such as 2,-0,, 4,,-2,, 3,-22, 4,-22 and 7-4,, but B(E2) values, for nonallowed △7=0, ±2 transitions such as 2,-4,, 47-2,, 41-2a and 43-2,, seem to be lessened.