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A Rerouting-Controlled ISL Handover Protocol For LEO Satellite Networks
( Wei Dong ),( Junfeng Wang ),( Minhuan Huang ),( Jian Tang ),( Hongxia Zhou ) 한국인터넷정보학회 2012 KSII Transactions on Internet and Information Syst Vol.6 No.10
In this paper, a rerouting-controlled ISL (Inter-Satellite link) handover protocol for LEO satellite networks (RCIHP) is proposed. Through topological dynamics and periodic characterization of LEO satellite constellation, the protocol firstly derives the ISL related information such as the moments of ISL handovers and the intervals during which ISLs are closed and cannot be used to forward packet. The information, combined with satellite link load status, is then been utilized during packet forwarding process. The protocol makes a forwarding decision on a per packet basis and only routes packets to living and non-congested satellite links. Thus RCIHP avoids periodic rerouting that occurs in traditional routing protocols and makes it totally unnecessary. Simulation studies show that RCIHP has a good performance in terms of packet dropped possibility and end-to-end delay.
Wei-Fu Lv,Jian-Kui Han,De-Lei Cheng,Chun-Ze Zhou,Ming Ni,Dong Lu 대한영상의학회 2015 Korean Journal of Radiology Vol.16 No.4
To prospectively evaluate the performance of computed tomography perfusion imaging (CTPI) in predicting the early response to transarterial chemo-lipiodol infusion (TACLI) and survival of patients with colorectal cancer liver metastases (CRLM). Computed tomography perfusion imaging was performed before and 1 month after TACLI in 61 consecutive patients. Therapeutic response was evaluated on CT scans 1 month and 4 months after TACLI; the patients were classified as responders and non-responders based on 4-month CT scans after TACLI. The percentage change of CTPI parameters of target lesions were compared between responders and non-responders at 1 month after TACLI. The optimal parameter and cutoff value were determined. The patients were divided into 2 subgroups according to the cutoff value. The log-rank test was used to compare the survival rates of the 2 subgroups. Four-month images were obtained from 58 patients, of which 39.7% were responders and 60.3% were non-responders. The percentage change in hepatic arterial perfusion (HAP) 1 month after TACLI was the optimal predicting parameter (p = 0.003). The best cut-off value was -21.5% and patients who exhibited a ≥ 21.5% decrease in HAP had a significantly higher overall survival rate than those who exhibited a < 21.5% decrease (p < 0.001). Computed tomography perfusion imaging can predict the early response to TACLI and survival of patients with CRLM. The percentage change in HAP after TACLI with a cutoff value of -21.5% is the optimal predictor.
Zhou Ronghua,Liao Xianqing,Liu Fang,Dong Qing,Chen Wei,Wang YaPing,Rao Ben 한국생물공학회 2020 Biotechnology and Bioprocess Engineering Vol.25 No.4
Chitin is a linear homopolymer of acetylated β- (1,4)-linked glucosamine residues and among the most abundant polysaccharides in the world. Here, we identified and purified a novel chitosanase (CCHA) from Aspergillus oryzae NKY2017 obtained from Hu’bei province in China. Construction of a cDNA library from this strain revealed the gene sequence subsequently expressed in Pichia pastoris and subsequent construction of multi-copy expression plasmids (CCHA1/2/3/4). The results demonstrated elevated levels of CCHA expression in multi-copy strains, with strain CCHA4 chosen for high-density fermentation and enzyme-activity experiments. High-density fermentation achieved a CCHA yield of 22,500 U/mL, and temperature and pH optimization resulted in the highest CCHA activity at 40°C and 4.0, respectively. We used this enzyme for a large-scale preparation of oligosaccharides: 4 g enzyme could convert 150 kg chitosan into oligosaccharides in 24 h at 40°C. These results demonstrated abundant CCHA expression in P. pastoris and suggested the efficacy of CCHA for use in industrial applications.
Zhou, Gengheng,Byun, Joon-Hyung,Oh, Youngseok,Jung, Byung-Mun,Cha, Hwa-Jin,Seong, Dong-Gi,Um, Moon-Kwang,Hyun, Sangil,Chou, Tsu-Wei American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.5
<P>Textile-based humidity sensors can be an important component of smart wearable electronic-textiles and have potential applications in the management of wounds, bed-wetting, and skin pathologies or for microclimate control in clothing. Here, we report a wearable textile-based humidity sensor for the first time using high strength (similar to 750 MPa) and ultratough (energy-to break, 4300 J g(-1)) SWCNT/PVA filaments via a wet-spinning process. The conductive SWCNT networks in the filaments can be modulated by adjusting the intertube distance by swelling the PVA molecular chains via the absorption of water molecules. The diameter of a SWCNT/PVA filament under wet conditions can be as much as 2 times that under dry conditions. The electrical resistance of a fiber sensor stitched onto a hydrophobic textile increases significantly (by more than 220 times) after water sprayed. Textile-based humidity sensors using a 1:5 weight ratio of SWCNT/PVA filaments showed high sensitivity in high relative humidity. The electrical resistance increases by more than 24 times in a short response time of 40 s. We also demonstrated that our sensor can be used to monitor water leakage on a high hydrophobic textile (contact angle of 115.5 degrees). These smart textiles will pave a new way for the design of novel wearable sensors for monitoring blood leakage, sweat, and underwear wetting.</P>
ATCS: An Adaptive TCP Coding Scheme for Satellite IP Networks
( Wei Dong ),( Junfeng Wang ),( Minhuan Huang ),( Jian Tang ),( Hongxia Zhou ) 한국인터넷정보학회 2011 KSII Transactions on Internet and Information Syst Vol.5 No.5
In this paper we propose ATCS, a practical TCP protocol coding scheme based on network coding for satellite IP networks. The proposal is specially designed to enhance TCP performance over satellite networks. In our scheme, the source introduces a degree of redundancy and transmits a random linear combination of TCP packets. Since the redundant packets are utilized to mask packet loss over satellite links, the degree of redundancy is determined by the link error rates. Through a simple and effective method, ATCS estimates link error rates in real time and then dynamically adjusts the redundant factor. Consequently, ATCS is adaptable to a wide range of link error rates by coding TCP segments with a flexible redundancy factor. Furthermore, the scheme is compatible with traditional TCP variants. Simulation results indicate that the proposal improves TCP performance considerably.
Dong Yi Jie,Liu Zhen Hua,Zhou Jian Qiao,Zhan Wei Wei 대한영상의학회 2022 Korean Journal of Radiology Vol.23 No.4
Objective: To prospectively evaluate the efficacy of lauromacrogol injection for ablation (LIA) of benign predominantly cystic thyroid nodules and its related factors. Materials and Methods: A total of 142 benign predominantly cystic thyroid nodules (median volume, 12.5 mL; range, 0.4– 156 mL) in 137 patients (male:female sex ratio, 36:101; mean age ± standard deviation [SD], 49 ± 13 years) were treated with LIA after being confirmed as benign via cytology. The volume reduction rate (VRR) of the nodules and cosmetic score were evaluated during follow-up at 1, 3, and 6 months after treatment and every 6 months thereafter. A VRR of ≥ 50% at the 12-month follow-up was considered to indicate effective treatment. The associations between the clinical factors and nodular ultrasound features, including the initial nodule volume, proportion of solid components, vascularity grade and ineffective treatment (VRR of < 50% at the 12-month follow-up), and regrowth were analyzed. Results: All patients completed follow-up for at least 12 months. The average ± SD follow-up period was 32 ± 11 months (range, 12–54 months). The effective treatment rate was 73.2% (104/142), while the regrowth rate was 12.0% (17/142) at the last follow-up. Grade 2–3 intranodular vascularity in the solid components of the nodules was the only independent factor associated with ineffective treatment, with an odds ratio (reference category, grade 0–1) of 3.054 (95% confidence interval, 1.148–8.127) (p = 0.025). Conclusion: LIA is an effective treatment for predominantly cystic thyroid nodules. Grade 2–3 intranodular vascularity in the solid components of nodules is the only independent risk factor for ineffective LIA.
Wei Hua Yu,Han Bin Zhao,Dong Shen Tong,Chun Hui Zhou,Ping Shao 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.8
Candida rugosa lipase (CRL) was immobilized on an aminopropyl-functionalized MSU-H type mesoporous silica (AFMS) through physical adsorption and a covalent cross-linking. It was evaluated as a class of biocatalysts in the esterification of conjugated linoleic acid (CLA) isomers with ethanol. AFMS materials with varied content of aminopropyl were prepared by a simple co-condensation at near neutral pH condition. Introduction of aminopropyl chains and CRL molecules onto the AFMS supports was confirmed by Fourier transform infrared (FT-IR) spectra. CRL was immobilized on the AFMS through electrostatic and covalent interactions. The covalently cross-linked CRL gave a loading amount of 34.3mg CRL/g-support and a hydrolytic activity of 2471.5U/g-catalyst. It exhibited high operational stability and remained 23.9-27.5% of total esterification in 32 h consecutive four runs in the esterification of CLA with ethanol. Moreover, the immobilized CRLs catalyzed 2.8-3.8 times of esterification of cis-(c)9, trans-(t)11- CLA faster than that of t10, c12-CLA.
Dong Jiale,Wang Wenzhi,Zhou Wei,Zhang Siming,Li Meng,Li Ning,Pan Guoqing,Zhang Xianzuo,Bai Jiaxiang,Zhu Chen 한국생체재료학회 2023 생체재료학회지 Vol.27 No.00
Implant-associated infection (IAI) is increasingly emerging as a serious threat with the massive application of biomaterials. Bacteria attached to the surface of implants are often difficult to remove and exhibit high resistance to bactericides. In the quest for novel antimicrobial strategies, conventional antimicrobial materials often fail to exert their function because they tend to focus on direct bactericidal activity while neglecting the modulation of immune systems. The inflammatory response induced by host immune cells was thought to be a detrimental force impeding wound healing. However, the immune system has recently received increasing attention as a vital player in the host’s defense against infection. Anti-infective strategies based on the modulation of host immune defenses are emerging as a field of interest. This review explains the importance of the immune system in combating infections and describes current advanced immune-enhanced anti-infection strategies. First, the characteristics of traditional/conventional implant biomaterials and the reasons for the difficulty of bacterial clearance in IAI were reviewed. Second, the importance of immune cells in the battle against bacteria is elucidated. Then, we discuss how to design biomaterials that activate the defense function of immune cells to enhance the antimicrobial potential. Based on the key premise of restoring proper host-protective immunity, varying advanced immune-enhanced antimicrobial strategies were discussed. Finally, current issues and perspectives in this field were offered. This review will provide scientific guidance to enhance the development of advanced anti-infective biomaterials.