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EVC-TDMA: An Enhanced TDMA Based Cooperative MAC Protocol for Vehicular Networks
Tianjiao Zhang,Qi Zhu 한국통신학회 2020 Journal of communications and networks Vol.22 No.4
In order to optimize the communication mechanism inthe vehicular adHoc networks (VANETs), this paper presents anenhanced TDMA based cooperative MAC protocol called EVCTDMA. In EVC-TDMA, when the vehicles need to transmit multihop messages, they choose relay nodes dynamically according tothe relative speeds and buffer lengths. By monitoring the broadcasting messages, the other nodes can know the buffer lengths ofthe relay nodes, they will help transmit the relay messages whentheir buffer are idle or less. Considering the data arrive follows aPoison Point Process, this paper analyzes the nodes’ buffer lengthbased on a two-dimension Markov process. The simulation resultsshow that EVC-TDMA can reduce the dropping rate and improvethe throughput of the network.
Game-Based TDMA MAC Protocol for Vehicular Network
Zhang Tianjiao,Zhu Qi 한국통신학회 2017 Journal of communications and networks Vol.19 No.3
A vehicular ad hoc network (VANET) is a special network for vehicle-to-vehicle communication. The proper medium access control (MAC) protocol based on time division multiple access (TDMA) is the key to realizing efficient vehicle-to-vehicle communication. In a VANET, when two or more nodes occupy the same time slot and drive into each other's communication ranges, a reservation collision occurs, and all of the colliding nodes release their slots. This paper presents a game-based TDMA MAC protocol (GAH-MAC) to solve this problem. In this protocol, when a reservation collision occurs, the colliding nodes will play games with each other to decide whether to reserve the original slot or a new one. In this way, the time slots can be fully used, and the reservation speeds can be increased without being controlled by the base stations. The simulation results show that the performance of GAH-MAC is superior in high-density networks, raising the success rate of reservations and increasing network throughput.
Xinye Zhu,Tianjiao An,Bo Dong 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.2
This paper develops a data-driven multiplayer mixed-zero-sum game control approach of modular robot manipulators (MRMs) with uncertain disturbance via adaptive dynamic programming (ADP). The dynamic model of MRMs is formulated via joint torque feedback. We deem n modules and uncertain disturbance as players in the game theory structure. The uncertainties in the MRM system such as joint friction and interconnected dynamic couplings (IDCs), we employ data-driven model based on recurrent neural networks (RNNs) to built. According to ADP, the Hamilton-Jacobi (HJ) equation can be solved by using critic neural networks and derivate the optimal control law. The closed-loop robotic system is proved to be asymptotic stable via mixed-zero-sum game control. Experiments are conducted to verify the effectiveness.
Two Indolocarbazole Alkaloids with Apoptosis Activity from a Marine-derived Actinomycete Z$_2$039-2
Liu, Rui,Zhu, Tianjiao,Li, Dehai,Gu, Jingyan,Xia, Wei,Fang, Yuchun,Zhu, Weiming 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.3
Bioassay-guided fractionation of the EtOAc extract from the fermentation broth of a marine-derived actinomycete Z$_2$039-2 led to the isolation of two known indolocarbazole alkaloids, K252c (1) and arcyriaflavin A (2). 1 and 2 exhibited moderate cytotoxic activities against the K562 cell line, and induced apoptotic activities at 10 and 100 ${\mu}$M, respectively. This is the first report on the significant apoptosis inducing effect of indolocarbazole alkaloids against K562cancer cells.
Two Indolocarbazole Alkaloids with Apoptosis Activity from a Marine-derived Actinomycete Z2039-2
Rui Liu,Tianjiao Zhu,Dehai Li,Jingyan Gu,Wei Xia,Yuchun Fang,HongbingLiu,Weiming Zhu,Qianqun Gu 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.3
Bioassay-guided fractionation of the EtOAc extract from the fermentation broth of a marinederived actinomycete Z2039-2 led to the isolation of two known indolocarbazole alkaloids, K252c (1) and arcyriaflavin A (2). 1 and 2 exhibited moderate cytotoxic activities against the K562 cell line, and induced apoptotic activities at 10 and 100 µM, respectively. This is the first report on the significant apoptosis inducing effect of indolocarbazole alkaloids against K562 cancer cells.
Penipyrols A–B and peniamidones A–D from the mangrove derived Penicillium solitum GWQ-143
Wenqiang Guo,Xianglan Kong,Tianjiao Zhu,Qian Qun Gu,Dehai Li 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.8
Chemical investigation the extract of Penicillium solitum GWQ-143 led to yield four new compounds penipyrols A–B (1–2) and peniamidones A–B (3–4), together with peniamidones C–D (5–6), which had been previously described as synthetic intermediates, not obtained from natural resource. The structures of those new compounds were established through extensive spectroscopic analysis. Compounds 1–6 exhibited great radical scavenging activities against DPPH with IC50 values ranged from 4.7 to 15.0 lM.
Two new meroterpenoids produced by the endophytic fungus Penicillium sp. SXH-65
Xinhua Sun,Xianglan Kong,Huquan Gao,Tianjiao Zhu,Guangwei Wu,Qianqun Gu,Dehai Li 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.8
Two new meroterpenoids, arisugacins I (1) andJ (2), together with five known meroterpenoids includingarisugacin B (3), arisugacin F (4), arisugacin G (5), territremB (6) and territrem C (7) were isolated from anendophytic fungus Penicillium sp. SXH-65. Their structureswere determined by extensive spectroscopic experimentsand comparison with literature data. Theircytotoxicities were evaluated against Hela, HL-60 andK562 cell lines, and only 3 and 4 exhibited weak cytotoxicitiesagainst Hela, HL-60 and K562 cell lines withIC50 values ranging from 24 to 60 lM.
Lin, Aiqun,Wu, Guangwei,Gu, Qianqun,Zhu, Tianjiao,Li, Dehai 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.7
Chemical investigation of an Antarctic deep-sea derived fungus Penicillium sp. PR 19 N-1 yielded five new eremophilane-type sesquiterpenes 1-5 and a new rare lactam-type eremophilane 6, together with three known compounds 7-9. The structures of these diverse sesquiterpenes were determined by extensive NMR and mass spectroscopic analyses. Compounds 1, 2, 4-6, 8 and 9 were evaluated for their cytotoxities against HL-60 and A-549 human cancer cell lines, and 5 was the most active one with $IC_{50}$ value of $5.2{\mu}M$ against the A-549 cells.
Hong Ren,Rui Liu,Li Chen,Tianjiao Zhu,Wei Ming Zhu,Qian Qun Gu 대한약학회 2010 Archives of Pharmacal Research Vol.33 No.4
Two new hetero-spirocyclic γ-lactams, azaspirofurans A (1) and B (2), had been isolated from a marine sediment-derived fungus Aspergillus sydowi D2-6. Their structures were determined by the chemical evidence and spectral analyses. Compound 1 exhibited cytotoxicity against A549 cell line with the IC50 value of 10 μM by MTT method.