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Microstructures and Properties of Molybdenum Wire Doped with Minim La2O3
Li DaCheng,Bu Chunyang,Zhu Yong-An,Wang Jin 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The microstructures and properties of pure molybdenum wire and Mo-La2O3 alloy wire annealed at different temperatures are investigated systematically in this paper. It is shown that the recrystallization temperature, toughness and strength at room temperature of this wire was increased greatly by addition of La2O3. The room temperature embrittlement of this wire annealed at high temperature is improved remarkably.
The Science Development of Chinese Railways
Song Yiling,He Dacheng 대한교통학회 1998 대한교통학회 기타자료 Vol.1998 No.-
This paper is based on the science and technology development plan of Chinese railways, it has briefly described the big breakthrough achieved during the " Ninth Five Year Plan " and has presented the outstanding symbol of science and technology level of Chinese railways by the year of 2000.
Distributed Resource Allocation in Two-Hierarchy Networks
Shuhui Liu,Yongyu Chang,Guangde Wang,Dacheng Yang 한국전자통신연구원 2012 ETRI Journal Vol.34 No.2
In this paper, a new distributed resource allocation algorithm is proposed to alleviate the cross-tier interference for orthogonal frequency division multiplexing access macrocell and femtocell overlay. Specifically, the resource allocation problem is modeled as a non-cooperative game. Based on game theory, we propose an iterative algorithm between subchannel and power allocation called distributed resource allocation which requires no coordination among the two-hierarchy networks. Finally, a macrocell link quality protection process is proposed to guarantee the macrocell UE's quality of service to avoid severe cross-tier interference from femtocells. Simulation results show that the proposed algorithm can achieve remarkable performance gains as compared to the pure waterfilling algorithm.
Quasi-distributed Interference Coordination for HSPA HetNet
Chi Zhang,장용구,Shuqi Qin,Dacheng Yang 한국전자통신연구원 2014 ETRI Journal Vol.36 No.1
The heterogeneous network (HetNet) has been discussedin detail in the Long-Term Evolution (LTE) and LTEAdvanced standards. However, the standardization ofHigh-Speed Packet Access HetNet (HSPA HetNet)launched by 3GPP is pushing at full steam. Interferencecoordination (IC), which is responsible for dealing withthe interference in the system, remains a subject worthy ofinvestigation in regard to HSPA HetNet. In this paper,considering the network framework of HSPA HetNet, wepropose a quasi-distributed IC (QDIC) scheme to lowerthe interference level in the co-channel HSPA HetNet. OurQDIC scheme is constructed as slightly different energyefficientnon-cooperative games in the downlink (DL) anduplink (UL) scenarios, respectively. The existence anduniqueness of the equilibrium for these games are firstrevealed. Then, we derive the closed-form best responsesof these games. A feasible implementation is finallydeveloped to achieve our QDIC scheme in the practicalDL and UL. Simulation results show the notable benefitsof our scheme, which can indeed control the interferencelevel and enhance the system performance.
Li Lan,Jinfeng Wang,Shanhu Chen,Dacheng Li,Hongmei Li,Dayu Liu,Wei Wang,Yaoqiang Chen 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.71 No.-
In this work, an advanced Rh/CeO2–ZrO2 (Rh/CZ) three-way catalyst was synthesized with the assistanceof monoethanolamine. Compared with conventional Rh/CZ, the dispersion and oxidation state of Rhspecies, as well as the hydrothermal aging resistance are remarkably modified. That is, upon agingtreatment, conventional Rh/CZ undergoes severe agglomeration of Rh species and formation of largeamount of reduction-resistive RhO2, resulting in serious catalyst deactivation. Fortunately, after theintroduction of monoethanolamine, the sintering of Rh species and transformation into inactive RhO2upon aging are effectively suppressed. Consequently, improved reducibility and advanced three-waycatalytic activity are achieved for the modified catalyst.
Coverage and Energy Modeling of HetNet Under Base Station On-Off Model
Sida Song,Yongyu Chang,Xianling Wang,Dacheng Yang 한국전자통신연구원 2015 ETRI Journal Vol.37 No.3
Small cell networks, as an important evolution path for next-generation cellular networks, have drawn much attention. Different from the traditional base stations (BSs) always-on model, we proposed a BSs on-off model, where a new, simple expression for the probabilities of active BSs in a heterogeneous network is derived. This model is more suitable for application in practical networks. Based on this, we develop an analytical framework for the performance evaluation of small cell networks, adopting stochastic geometry theory. We derive the system coverage probability; average energy efficiency (AEE) and average uplink power consumption (AUPC) for different association strategies; maximum biased received power (MaBRP); and minimum association distance (MiAD). It is analytically shown that MaBRP is beneficial for coverage but will have some loss in energy saving. On the contrary, MiAD is not advocated from the point of coverage but is more energy efficient. The simulation results show that the use of range expansion in MaBRP helps to save energy but that this is not so in MiAD. Furthermore, we can achieve an optimal AEE by establishing an appropriate density of small cells.
Fast Quadtree Structure Decision for HEVC Intra Coding Using Histogram Statistics
( Yuchen Li ),( Yitong Liu ),( Hongwen Yang ),( Dacheng Yang ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.5
The final draft of the latest video coding standard, High Efficiency Video Coding (HEVC), was approved in January 2013. The coding efficiency of HEVC surpasses its predecessor, H.264/MPEG-4 Advanced Video Coding (AVC), by using only half of the bitrate to encode the same sequence with similar quality. However, the complexity of HEVC is sharply increased compared to H.264/AVC. In this paper, a method is proposed to decrease the complexity of intra coding in HEVC. Early pruning and an early splitting strategy are applied to the quadtree structure of coding tree units (CTU) and residual quadtree (RQT). According to our experiment, when our method is applied to sequences from Class A to Class E, the coding time is decreased by 44% at the cost of a 1.08% Bjontegaard delta rate (BD-rate) increase on average.
Kong, Lingqian,Zhang, Daopeng,Su, Fangfang,Li, Dacheng,Dou, Jianmin Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.7
Two new carborane complexes containing closo- or nido-carborane diphosphine ligands with the formula: complex $[Hg(7,8-(PPh_2)_2-7,8-C_2B_9H_{10})_2]$ $CH_2Cl_2$ (1) and $[Ag_2({\mu}-Cl)_2(1,2-(P^iPr_2)_2-1,2-C_2B_{10}H_{10})_2]$ (2) have been synthesized and characterized by elemental analysis, 1H and 13C NMR spectroscopy and X-ray structure determination. The X-ray structure analyses revealed that the carborane diphosphine ligand was degraded from closo-1,2-$(PPh_2)_2-1,2-C_2B_{10}H_{10}$ to nido-[$7,8-(PPh_2)_2-7,8-C_2B_9H_{10}]^-$ in complex 1, while the closo nature of the starting ligand $1,2-(P^iPr_2)_2-1,2-C_2B_{10}H_{10}$ was retained in complex 2. In either of the two complexes, the carborane diphosphine ligand was coordinated bidentately to the Hg(II) or Ag(I) center through its two phosphorus atoms, therefore forming a five-member cheating ring between the carborane ligand and the metal center. The coordination geometry of the metal atom is distorted tetrahedron formed by $P_4$ unit in complex 1 and $P_2Cl_2$ unit in complex 2, respectively.