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Microcontroller Implementation of Rule-based Inference System for Smart Home
BonJae Koo,Young Soo Park,SungHyun Yang 보안공학연구지원센터 2014 International Journal of Smart Home Vol.8 No.6
Recently, the development of Machine to Machine (M2M) communication has been largely accomplished in a variety of fields including smart home. In M2M communication, the role of sensor node is only limited to gather data and send them to upper application layers. In this research, the limited role of the sensor node in traditional M2M communication is improved in order for the sensor node to make inference based on the sensor data. If the sensor node can make inference, it is possible to provide basic context-aware services within sensor node level. Therefore, in this paper, implementation of rule-based inference system on microcontroller for smart home is proposed.
Performance enhancement of multirate IEEE 802.11 WLANs with geographically scattered stations
Yang, Duck-Yong,Lee, Tae-Jin,Jang, Kyunghun,Chang, Jin-Bong,Choi, Sunghyun IEEE 2006 IEEE TRANSACTIONS ON MOBILE COMPUTING Vol.5 No.7
In today's IEEE 802.11 Wireless LANs (WLANs), e.g., the popular IEEE 802.11 b, stations support multiple transmission rates, and use them adaptively depending on the underlying channel condition via link adaptation. It has been known that when some stations use low transmission rates due to bad channel conditions, the performance of the stations using high rates is heavily degraded, and this phenomenon is often referred to as performance anomaly. In this paper, we model the WLAN incorporating stations with multiple transmission rates in order to demonstrate the performance anomaly analytically. Note that all the previously proposed models of the IEEE 802.11 assume a single transmission rate. We also develop possible remedies to improve the performance. Our solution is basically to control the access parameters such as the initial backoff window, the frame size, and the maximum backoff stage, depending on the employed transmission rate. Throughout simulations, we demonstrate that our analytical model is accurate, and the proposed mechanism can indeed provide the remedies to the performance anomaly by increasing the aggregate throughput up to six times.
법인세 인상의 재정 및 거시경제 효과에 대한 동태적 분석
김성현 ( Sunghyun Kim ),양은순 ( Eunsun Yang ),최윤석 ( Yoonseok Choi ) 한국경제학회 2017 經濟學硏究 Vol.65 No.2
본고는 소규모 개방경제의 특징을 갖는 2부문 동태적 일반균형 모형에 기초하여 최근 거론되고 있는 법인세 인상의 재정 및 거시경제 영향을 분석한다. 특히, 동태추계(dynamic scoring) 기법을 이용해 법인세 인상이 세수에 미치는 동태적 영향을 시뮬레이션을 통해 살펴본다. 분석결과 기업 전반에 걸쳐 법인세가 2%p 인상되는 경우 총세수는 초기 균제상태 세수 대비 단기적으로 약 1.3%, 장기적으로 0.5% 증가하는 것으로 나타난다. 하지만, 수출위주의 교역재 부문만을 대상으로 법인세 인상이 이루어질 경우 단기적 총세수 증가의 영향은 미미하고 장기적으로 오히려 세수가 줄어드는 결과가 나타난다(-0.2%). 경제후생 역시 법인세 인상으로 인해 감소하는데, 이는 법인세 인상이 총수요를 감소시켜 소비수준이 하락하는데 그 원인이 있는 것으로 평가된다. 결론적으로 법인세 인상은 단기적으로 세수를 증가시킬 수 있으나 장기적으로 총수요 감소와 자본유출 심화로 세수증가에 미치는 영향이 줄어들게 되고 주요 거시변수 및 후생에 부정적 영향을 미치게 된다. This paper uses a small open two-sector dynamic general equilibrium model to analyze revenue and welfare effects of a potential increase in corporate income tax rate in Korea. We use a dynamic scoring method which allows us to analyze dynamic revenue effects of changes in tax rates through model simulation. The simulation results suggest that an increase in corporate income tax rate (by 2%p) in both sectors increases total tax revenue by 1.30% in the short run and by 0.50% in the long run. An increase in corporate income tax rate in the tradable sector only increases total tax revenue by about 1.00% in the short run but decreases total tax revenue by 0.22% in the long run. A decrease in investment and a resulting increase in capital outflows due to a tax hike are the main causes of a decrease in tax revenue. Welfare decreases when the tax hike is applied to both sectors or to the tradable sector. In conclusion, a corporate income tax hike is not a desirable policy in order to raise tax revenue.
Brownmillerite Ca₁-xSrxFeO2.5(x=0, 0.3, 0.5, 0.7, 1.0)의 결정학적 및 자기적 성질에 관한 연구
윤성현(Sunghyun Yoon),양주일(Ju-Il Yang),김철성(Chul Sung Kim) 한국자기학회 2004 韓國磁氣學會誌 Vol.14 No.2
Crystallographic and magnetic properties for Brownmillerite-type oxides Ca_(1-x)Sr_xFeO_(2.5)(x = 0, 0.3, 0.5, 0.7, 1.0) were investigated using x-ray diffraction (XRD) and Mossbauer spectroscopy. Polycrystalline samples were prepared by conventional solid-state reaction method. Information on exact crystalline structures, lattice parameters, bond lengths and bond angles were obtained by refining their XRD profiles using a Rietveld method. The crystal structures were found to be all orthorhombic with space group Pcmn (x = 0, 0.3) and Icmm (x = 0.5, 0.7, 1.0) The lattice parameters increased monotonically with increasing Sr concentration. Both the tetrahedral and the octahedral sites were considerably distorted and elongated along b-axis. While bond lengths and bond angles O-Fe-O tend to increase minutely with the increase of Sr content, bond angles Fe-O-Fe decreased accordingly. The Mossbauer spectra showed two sets of sharp sextets originating from ferric ions occupying the tetrahedral and the octahedral sites under the magnetic transition temperature T_N. Regardless of the compositions x, the electric quadrupole splittings were -0.3 ㎜/s and 0.4 ㎜/s for the octahedral and the tetrahedral site, respectively. Above T_N, the Mossbauer spectra showed the paramagnetic doublets whose electric quadrupole splittings were about 1.6 ㎜/s, irrespective of compositions x. T_N was found to decrease monotonically with the increase of Sr concentration. Ratios of absorption area for the two sites were almost 1:1 up to as high as 0.95T_N for all x. The result of the Debye temperature indicated that the inter-atomic binding force for the Fe atoms in the tetrahedral site was stronger than that for the octahedral site.
Exposure pattern influences the degree of drug-seeking behaviour after withdrawal
In, Sunghyun,Zhao, Rong Jie,Han, Hye Ryeong,Yang, Chae Ha,Kim, Hee Young,Gwak, Young S.,Lee, Bong Hyo Cambridge University Press 2016 Acta neuropsychiatrica Vol.28 No.4
<B>Objectives</B><P>The occurrence of a relapse during abstinence is an important issue that must be addressed during treatment for drug addiction. We investigated the influence of drug exposure pattern on morphine-seeking behaviour following withdrawal. We also studied the role of the hippocampus in this process to confirm its involvement in drug relapse.</P><B>Methods</B><P>Male Sprague-Dawley rats that were trained to self-administer morphine (1.0 mg/kg) using 2, 4, 6, 8, or 10 h daily sessions underwent withdrawal in their home cages and were re-exposed to the operant chamber to evaluate morphine-seeking behaviour. During the relapse session, rats were intravenously injected with morphine (0.25 mg/kg) or saline before re-exposure to the chamber. In the second experiment, rats were administered a microinjection of saline or cobalt chloride (CoCl2, 1 mM), a synaptic blocker, into the CA1 of the hippocampus prior to the relapse test.</P><B>Results</B><P>In the first experiment, more morphine-seeking behaviour was observed in the 2 h group (animals trained to self-administer morphine during a 2 h daily session spread over 21 days) during the relapse session, despite all groups being exposed to similar amounts of morphine during the training period before withdrawal. In the second experiment, pretreatment with CoCl2 markedly reduced morphine-seeking behaviour in the 2 h group.</P><B>Conclusions</B><P>The present findings suggest that the exposure pattern influences the degree of relapse and that control of memorisation is important for prevention of relapse.</P>
Development of Fuel Quantity Measurement System for Aircraft Supplementary Fuel Tank
Junmo Yang(양준모),Bonggyun Kim(김봉균),Sunghyun Hahn(한성현),Sangchul Lee(이상철) 한국항공우주학회 2020 韓國航空宇宙學會誌 Vol.48 No.11
본 논문에서는 항공기 자세 변화를 고려한 항공기 보조연료탱크 연료량측정시스템을 제시하였다. 개발된 연료량측정시스템은 연료센서, 데이터 처리장치, 계기 및 센서 데이터로부터 연료량을 추정하는 소프트웨어로 구성되었다. 지상에서의 롤 및 피치 자세 변화를 모사하기 위해 모사시험장치가 개발되었다. 모사시험장치를 이용하여 다양한 연료량, 롤 및 피치 각도의 센서 데이터를 자동으로 측정하여 트레이닝 데이터 세트를 획득하였다. 연료량을 추정하는 연료량 측정 소프트웨어를 트레이닝 데이터 세트와 함께 삼선형보간법을 사용하여 개발하였다. 개발된 연료량측정시스템은 참값을 알고 있는 테스트 데이터 세트의 연료 추정 오차를 측정하여 검증하였다. 테스트를 통해 개발된 연료량측정시스템의 오차가 TSO-C55 문서의 기준을 충족하는 것을 확인하였다. This paper presents a fuel quantity measurement system (FQMS) for an aircraft supplementary fuel tank considering the change of aircraft attitude. The developed FQMS consists of fuel sensors, a signal process unit, an indicator and a software to estimate the fuel quantity from the sensor data. To replicate the change of the roll and pitch attitude on the ground, the test simulator is developed in this work. Using the test simulator, the sensor data at various fuel quantities, roll and pitch angles are automatically measured to build a training data set. The data-driven software to estimate the fuel quantity is then developed using a trilinear interpolation method with the training data set. The developed FQMS is verified by investigating the fuel estimation error of the test data set that we know the true values. Through the test, it is confirmed that the error of the developed FQMS system satisfies the criteria of TSO-C55 document.