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군집 별 표준곡선 매개변수를 이용한 치밀오일 생산성 예측 순환신경망 모델
한동권(Dong-kwon Han),김민수(Min-soo Kim),권순일(Sun-il Kwon) 한국정보통신학회 2021 한국정보통신학회 종합학술대회 논문집 Vol.25 No.2
치밀오일 미래 생산성 예측은 잔류오일 회수량 및 저류층 거동 분석을 위해 중요한 작업이다. 일반적으로 석유공학적 관점에서 감퇴곡선법을 이용하여 생산성 예측이 이루어지는데, 최근에는 데이터기반의 머신러닝 기법을 이용한 연구도 수행되고 있다. 본 연구에서는 딥러닝 기반 순환신경망과 LSTM, GRU 알고리즘을 이용하여 미래 생산량 예측을 위한 효과적인 모델을 제안하고자 한다. 입력변수로는 치밀오일 생산 시 산출되는 오일, 가스, 물과 이와 더불어 다양한 군집분석을 통해 산출된 표준곡선이 주요 매개변수이고, 출력변수는 월별 오일 생산량이다. 기존의 경험적 모델인 감퇴곡선법과 순환신경망 모델들을 비교하였으며, 모델의 예측성능을 향상시키기 위해 하이퍼파라미터 튜닝을 통해 최적 모델을 도출하였다. Predicting future productivity of tight oil is an important task for analyzing residual oil recovery and reservoir behavior. In general, productivity prediction is made using the decline curve analysis(DCA). In this study, we intend to propose an effective model for predicting future production using deep learning-based recurrent neural networks(RNN). LSTM, and GRU algorithms. As input variables, the main parameters are oil, gas, water, which are calculated during the production of tight oil, and the type curve calculated through various cluster analyzes. the output variable is the monthly oil production. Existing empirical models, the DCA and RNN models, were compared, and an optimal model was derived through hyperparameter tuning to improve the predictive performance of the model.
손동우,권영민,반사평,김순중 世明대학교 한의학연구소 2003 韓醫學硏究所 論文集 Vol.5 No.-
The purpose of this study was to investigate the effects of Aromatic Essential Oil and Hong-Hwa Oil Massage on recovery from muscle fatigue. The subjects were twenty four male college students and treated Aromatic Essential Oil massage therapy, Nomral massage therapy, Hong-hwa oil Massage therapy and Non-treated group. After 15, 30 minutes, to observe changes related to physical changes during exercises from muscle fatique of recovery period, it was measured by Electromyogram during thirty minutes of recover period. Two-way repeated ANOVA was performed at the significance level of 0.05 to analyze the data. The results were as following; 1. Considering the changes of reaction time in knee joint extension after exercise, Periods of all groups showed decrease nearly the same. So each period didn't show significant decrease in comparing with other all gorups. 2. Considering the changes of EMG reaction time in knee joint extension after exercise, Each periods and all groups didn't show significant decrease. But Aromatic Essential Oil therapy group showed remarkably decrease in comparing with other group. 3. Considering the changes of peak amplitude during initial phase 100 msec in knee joint extension before and after exercise, Each periods of all groups didn't show significant decrease. Aromatic Essential Oil therapy and Hong-hwa oil massage group had show remarkably decrease in comparing with other group but it is not significant. 4. Considering the changes of mean amplitude during total phase in knee joint extension before and after exercise, Each periods of all groups showed significance decrease. And Aromatic Essential Oil massage group showed remarkably significant decrease in comparing with other groups. According to the above results, it tis considered that Aromatic Essential Oil massage can be a way to help to recover from muscle fatique.
Guo-Hua Feng,Fu-Sheng Wang,Ji-Yuan Zhang,Qing-Lei Zeng,Lei Jin,Junliang Fu,Bin Yang,Ying Sun,Tianjun Jiang,Xiangsheng Xu,Zheng Zhang,Jinhong Yuan,Liyuan Wu 한국분자세포생물학회 2013 Molecules and cells Vol.36 No.4
Interleukin-21 (IL-21)+CD4+ T cells are involved in the immune response against hepatitis B virus (HBV) by secreting IL-21. However, the role of IL-21+CD4+ T cells in the immune response against chronic hepatitis C (CHC) virus infection is poorly understood. This study aimed to investigate the role of IL-21+CD4+ T cells in CHC patients and the potential mechanisms. The study subjects in-cluded nineteen CHC patients who were grouped by viral load (low, < 106 RNA copies/ml, n = 8; high, > 106 RNA copies/ml, n = 11). The peripheral frequency of HCV-specific IL-21+CD4+ T cells was higher in the low viral load group and was negatively correlated with the serum HCV RNA viral load in all CHC patients. Meanwhile, IL-21+ cells accumulated in the liver in the low viral load group. In vitro, IL-21 treatment increased the expression of proliferation markers and cytolytic molecules on HCV-specific CD8+ T cells. In summary, these findings suggest that HCV-specific IL-21+CD4+ T cells might contribute to HCV control by rescuing HCV-specific CD8+ T cells in CHC patients.
한대근,정호선,이우일 경북대학교 공과대학 1986 工大硏究誌 Vol.15 No.-
The control part of CMOS single chip micro-computer has been designed and simulated with GLOG. The circuits have been implemented using SPICE simulator. Results of logic simulation and circuit simulation were in good agreements with expected circuit characteristics.
전하평형형 적분방식을 이용한 CMOS 8-bit A/D 변환기 설계
박철영,정호선,이우일 경북대학교 공과대학 1986 工大硏究誌 Vol.15 No.-
This paper describes the design of 12-bit CMOS charge balancing A/D converter which has inherently high accuracy, linearity and noise immunity. System was simulated with logic simulator (KLOG) and circuits were simulated by circuit simulator (SPICE). The result of logic and circuit simulation has turned out that the A/D converter designed by 5㎛ design rule operated normally.
ANGULAR DISTRIBUTION OF SOLUTIONS OF HIGHER ORDER LINEAR DIFFERENTIAL EQUATIONS
Wu, Zhaojun,Sun, Daochun Korean Mathematical Society 2007 대한수학회지 Vol.44 No.6
In this paper, we study the location of zeros and Borel direction for the solutions of linear homogeneous differential equations $$f^{(n)}+A_{n-1}(z)f^{(n-1)}+{\cdots}+A_1(z)f#+A_0(z)f=0$$ with entire coefficients. Results are obtained concerning the rays near which the exponent of convergence of zeros of the solutions attains its Borel direction. This paper extends previous results due to S. J. Wu and other authors.
Wu, Qiang,Zhao, Yi-Bing,Sun, Zhi-Hua,Ni, Jing,Wu, Yu-Zhong,Shao, Heng-Hua,Qu, Jun-Wei,Huang, Xin-En Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.12
Aim: To examine lymph nodes obtained after lipolysis and liposuction of subcutaneous fat of the inguinal region of female vulvar cancer patients to explore the feasibility of clinical application. Methods: The field of operation was on the basis of the range of the conventional resection of inguinal lymph nodes. We injected lipolysis liquid fanwise, started liposuction after 15-20 minutes; then the subcutaneous fatty tissue was sucked out clearly by suction tube. We selected the first puncture holes located on 2-3 cm part below anterior superior spine, the others respectively being located 3cm and 6cm below the first for puncturing into the skin, imbedding a trocar to intorduce $CO_2$ gas and the specular body, and excise the lymph nodes by ultrasonic scalpel. The surgical field chamber was set with negative pressure drainage and was pressured with a soft saline bag after surgery. Results: A lacuna emerged from subcutaneous of the inguinal region after lipolysis and liposuction, with a wide fascia easily exposed at the bottom where lymph nodes could be readily excised. The number of lymph nodes of ten patients excised within the inguinal region on each side was 4-18. The excised average number of lymph nodes was 11 when we had mature technology. Conclusion: Most of adipose tissue was removed after lipolysis and liposuction of subcutaneous tissue of inguinal region, so that the included lymph nodes were exposed and easy to excise by endoscope. This surgery avoided the large incision of regular surgery of inguinal region, the results indicating that this approach is feasible and safe for used as an alternative technology.