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Hongxiang Xue,Yuchao Yuan,Wenyong Tang 대한조선학회 2019 International Journal of Naval Architecture and Oc Vol.11 No.2
Surge motion of top-end platform induced by periodic wave makes marine flexible riser encounter equivalent sheared-oscillatory flow, under which the Vortex-induced Vibration (VIV) response will be more complicated than pure sheared flow or oscillatory flow cases. Based on a time domain forcedecomposition model, the VIV response characteristics under sheared-oscillatory flows are investigated numerically in this paper. Firstly, the adopted numerical model is validated well against laboratory experiments under sheared flow and oscillatory flow. Then, 20 sheared-oscillatory flow cases with different oscillation periods and top maximum current velocities are designed and simulated. Under long and short oscillation period cases, the structural response presents several similar features owing to the instantaneous sheared flow profile at each moment, but it also has some different patterns because of the differently varying flow field. Finally, the effects and essential mechanism of oscillation period and top maximum current velocity on VIV response are discussed systematically.
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Based on the Enterprise Exchange Network Path Reliability Design
Hongxiang Zhu 보안공학연구지원센터 2014 International Journal of u- and e- Service, Scienc Vol.7 No.5
In order to improve the work of a single path network reliability failure case, this chapter put forward a set of a single backup path algorithm based on the path. In this algorithm, using two disjoint paths as work path to transmit data, and USES the path does not intersect with the job of a set the path as the backup path. Then, this algorithm, is proposed based on a single - a single backup path algorithm of shortest path set to ensure data under the case of the second work path of effective transmission. Theoretical derivation and numerical simulation results show that in a single work path failure cases, and the calculation of DMP - compared to BP algorithm, this scheme can greatly improve network reliability, and save the network resources.
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Hongxiang Li,Zhaoping Lu,이승훈 대한금속·재료학회 2009 METALS AND MATERIALS International Vol.15 No.1
For the mass production of bulk metallic glasses, the use of industrial raw materials that contain certain amounts of inclusions is inevitable. The glass-forming ability of bulk metallic glasses, i.e., the critical cooling rate for glass formation upon solidification, is closely related to the nature of heterogeneous nucleation offered by inclusions during the solidification process. Significantly different effects of various types of inclusions on the glass forming ability of the alloy Fe68.8C7.0Si3.5B5.0P9.6Cr2.1Mo2.0Al2.0 are demonstrated in this study. The origins of the effects of different inclusions on the glass forming ability are analyzed through thermodynamic, crystallographic and classical heterogeneous nucleation kinetic theories. For the mass production of bulk metallic glasses, the use of industrial raw materials that contain certain amounts of inclusions is inevitable. The glass-forming ability of bulk metallic glasses, i.e., the critical cooling rate for glass formation upon solidification, is closely related to the nature of heterogeneous nucleation offered by inclusions during the solidification process. Significantly different effects of various types of inclusions on the glass forming ability of the alloy Fe68.8C7.0Si3.5B5.0P9.6Cr2.1Mo2.0Al2.0 are demonstrated in this study. The origins of the effects of different inclusions on the glass forming ability are analyzed through thermodynamic, crystallographic and classical heterogeneous nucleation kinetic theories.
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Second-Order Consensus of Multi-Agent Systems with Unknown but Bounded Disturbance
Hongxiang Hu,Li Yu,Guang Chen,Guangming Xie 제어·로봇·시스템학회 2013 International Journal of Control, Automation, and Vol.11 No.2
This paper addresses a consensus problem for second-order agents with unknown but bounded (UBB for short) disturbance which may affect the measure of neighbors’ velocities. In this study, the communication topology of the multi-agent system is supposed to be connected. In order to solve this consensus problem, a new velocity estimation called distributed lazy rule is firstly proposed, where each agent can estimate its neighbors’ velocities one by one. Then, a group of sufficient conditions for this second-order consensus problem are presented by adopting graph theory and the well-known Barbalat lemma, and the bounded consensus protocol is taken into account due to actuator saturation. Theoretically, the group of agents can reach consensus under the proposed control protocol, which is also validated by some numerical experiments.
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Hongxiang Chai,Liang Li,Yinghua Wei,Jian Zhou,Wei Kang,Zhiyu Shao,Qiang He 대한환경공학회 2016 Environmental Engineering Research Vol.21 No.2
Membrane bioreactor (MBR) technology has previously been used by water industry to treat high salinity wastewater. In this study, an anoxic-oxic biofilm-membrane bioreactor (AOB-MBR) system has been developed to treat mustard tuber wastewater of 10% salinity (calculated as NaCl). To figure out the effects of operating conditions of the AOB-MBR on membrane fouling rate (KV), response surface methodology was used to evaluate the interaction effect of the three key operational parameters, namely time interval for pump (t), aeration intensity (UGr) and transmembrane pressure (TMP). The optimal condition for lowest membrane fouling rate (KV) was obtained: time interval was 4.0 min, aeration intensity was 14.6 m3/(m2￥h) and transmembrane pressure was 19.0 kPa. And under this condition, the treatment efficiency with different influent loads, i.e. 1.0, 1.9 and 3.3 kg COD m-3d-1 was researched. When the reactor influent load was less than 1.9 kg COD m-3d-1, the effluent could meet the third discharge standard of “Integrated Wastewater Discharge Standard”. This study suggests that the model fitted by response surface methodology can predict accurately membrane fouling rate within the specified design space. And it is feasible to apply the AOB-MBR in the pickled mustard tuber factory, achieving satisfying effluent quality.
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Li, Hongxiang,Yi, Seonghoon Elsevier 2007 Materials science & engineering. properties, micro Vol.449 No.-
<P><B>Abstract</B></P><P>Fe-base bulk metallic glasses in the alloy system Fe–C–Si–B–P–Cr–Mo–Al have been developed using hot metal and industrial ferro-alloys. The amorphous alloys can be cast into fully amorphous rods with diameters of up to 4mm, demonstrating high glass-forming ability and high strength (>3GPa). Thermal stability and crystallization behavior of the Fe–C–Si–B–P–Cr–Mo–Al bulk metallic glasses are also investigated. The Fe-base bulk metallic glasses can be produced cost-effectively and massively for extensive structural applications.</P>
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Xue, Hongxiang,Yuan, Yuchao,Tang, Wenyong The Society of Naval Architects of Korea 2019 International Journal of Naval Architecture and Oc Vol.11 No.2
Surge motion of top-end platform induced by periodic wave makes marine flexible riser encounter equivalent sheared-oscillatory flow, under which the Vortex-induced Vibration (VIV) response will be more complicated than pure sheared flow or oscillatory flow cases. Based on a time domain force-decomposition model, the VIV response characteristics under sheared-oscillatory flows are investigated numerically in this paper. Firstly, the adopted numerical model is validated well against laboratory experiments under sheared flow and oscillatory flow. Then, 20 sheared-oscillatory flow cases with different oscillation periods and top maximum current velocities are designed and simulated. Under long and short oscillation period cases, the structural response presents several similar features owing to the instantaneous sheared flow profile at each moment, but it also has some different patterns because of the differently varying flow field. Finally, the effects and essential mechanism of oscillation period and top maximum current velocity on VIV response are discussed systematically.
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진홍상(Qin HongXiang),박승록(Park Seung Rok) 한국경제연구원 2005 한국경제연구원 연구보고서 Vol.2005-03 No.-
This study provides an appropriate model and practical road map regarding economic cooperation in the East Asian area, specifically Korea, China and Japan. Because China has an important role in Northeast Asia economic cooperation, it must be included in discussions of East Asian economic cooperation. The main topics examined in this research are as follows: In Chapter II, we first examine the phase of the East Asian/Northeast Asian economic bloc under the triangular position of the international economy that has been formed according to the spread of globalization and regionalism, which are perhaps the most important trends of 21st century. Today, the international economy can be said to be composed of three sets of economic regions, the EU, NAFTA and East Asia. Although the EU and NAFTA accomplished economic integration to a high degree, the Northeast Asian economic cooperation has not matched the trend of the international economy. However, the Northeast Asia area has been acknowledged as a very dynamic growth having recorded high economic growth rates for the past 20 to 30 years, and presently constitutes about 20% of world economy. Moreover, the importance of the Northeast Asia economy in the world economy is forecasted to increase continuously corresponding to economic growth in the Northeast Asia countries including China, in spite the relative slowdown of the Japanese economy that has been experiencing long-term economy stagnation since the 1990s. The necessity of economic cooperation in East Asian countries remains an urgent agenda. In Chapter III, we examine the East Asian economy and economic relations of South Korea, China and Japan. The dynamics of the East Asian economy can be characterized by its high economic growth rate, solidified position in the world export market, an important position in investment markets, enlargement of East Asian internal trade and formation of new structure of international division of labor, richer foreign exchange reserves, and so on. The economical relation among Korea, China and Japan representing the economic dynamism of the region can be further strengthened through economic cooperation and economic integration in this area. In Chapter IV, we examine the concept and boundaries, and geopolitical and geo-economical position of Northeast Asian economic bloc composed of Korea, China and Japan, as well as including Mongolia, Russia and North Korea. Notwithstanding the variance in material reserves, capital, technology, human capital, and differences in the stages of development, we suggest probable economic profits from the Northeast economic cooperation based on potential, economically complementary position and development strategies of the Northeastern Chinese economy. Based on the above chapters, in Chapter V, we propose the models of “forest of cultural environment” and “tree with common roots” as a desirable way of policy design and execution for Northeast Asian economic cooperation. Considering the specialty of political and economical phases, the Northeast Asian economic cooperation cannot utilize the experience of economic integration of the EU and NAFTA because of situational and historical difference between these regions. Thus economic cooperation and integration should proceed along a third way, by creating a new model that coincides in the specialty of this area. The last Chapter VI concerns the extension of the Northeast Asian economic cooperation. As one part of the East Asian economic bloc, the Northeast Asian economic cooperation ultimately must be extended into the East Asian economic cooperation through 10+1 FTA, Korea-Japan FTA, Korea-China FTA or Korea-China-Japan FTA.
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