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( Xiaowei Tang ),( Yutang Ren ),( Silin Huang ),( Qiaoping Gao ),( Jieqiong Zhou ),( Zhengjie Wei ),( Bo Jiang ),( Wei Gong ) 대한간학회 2017 Gut and Liver Vol.11 No.5
Background/Aims: In recent years, endoscopic submucosal tunnel dissection (ESTD) has gained popularity worldwide. The aim of this study was to evaluate the safety and efficacy of ESTD in treating upper gastrointestinal submucosal tu-mors (SMTs) in a large-volume endoscopic center. Methods: Patients with SMTs were enrolled in this study between January 2012 and January 2015. Demographic data, clinical data, and treatment outcome were collected and analyzed. Results: Seventy SMTs originating from the muscularis pro-pria (MP) layer were identified in 69 patients. All patients successfully underwent the ESTD procedure. The mean procedure time was 49.0±29.5 minutes, and the mean tu-mor size was 18.7±7.2 mm. Among all lesions, the majority (70.0%) were located in the esophagus, 12.9% in the cardia, and 17.1% in the stomach. Complete resection was achieved in 67 lesions (95.7%). Perforation occurred in three patients (4.3%), who were treated by endoclips. Pneumothorax oc-curred in two patients (2.9%) and was successfully managed by thoracic drainage. During a median follow-up of 18.1 months, patients were free of local recurrence or distant metastasis. Conclusions: Our results demonstrated the fea-sibility and safety of ESTD in treating upper gastrointestinal SMTs originating from the MP layer. Large-scale comparative studies with other treatment methods should be conducted in the future. (Gut Liver 2017;11:620-627)
Skew n-derivations on semiprime rings
Xiaowei Xu,Yang Liu,Wei Zhang 대한수학회 2013 대한수학회보 Vol.50 No.6
For a ring R with an automorphism σ, an n-additive mapping Δ: R × R × · · · × R ! R is called a skew n-derivation with respect to σ if it is always a σ-derivation of R for each argument. Namely, if n − 1 of the arguments are fixed, then Δ is a σ-derivation on the remaining argument. In this short note, from Breˇsar Theorems, we prove that a skew n-derivation (n ≥ 3) on a semiprime ring R must map into the center of R.
Nonadditive strong commutativity preserving derivations and endomorphisms
Wei Zhang,Xiaowei Xu 대한수학회 2014 대한수학회보 Vol.51 No.4
Let S be a nonempty subset of a ring R. A map f : R → R is called strong commutativity preserving on S if [f(x), f(y)] = [x, y] for all x, y ∈ S, where the symbol [x, y] denotes xy − yx. Bell and Daif proved that if a derivation D of a semiprime ring R is strong commutativity preserving on a nonzero right ideal of R, then p⊆ Z, the center of R. Also they proved that if an endomorphism T of a semiprime ring R is strong commutativity preserving on a nonzero two-sided ideal I of R and not identity on the ideal I ∪ T−1(I), then R contains a nonzero central ideal. This short note shows that the conclusions of Bell and Daif are also true without the additivity of the derivation D and the endomorphism T.
Cross-Layer Resource Allocation in Multi-interface Multi-channel Wireless Multi-hop Networks
Wei Feng,Suili Feng,Yongzhong Zhang3,Xiaowei Xia 한국전자통신연구원 2014 ETRI Journal Vol.36 No.6
In this paper, an analytical framework is proposed forthe optimization of network performance through jointcongestion control, channel allocation, rate allocation,power control, scheduling, and routing with theconsideration of fairness in multi-channel wireless multihopnetworks. More specifically, the framework modelsthe network by a generalized network utilitymaximization (NUM) problem under an elastic link datarate and power constraints. Using the dual decompositiontechnique, the NUM problem is decomposed into foursubproblems — flow control; next-hop routing; rateallocation and scheduling; power control; and channelallocation — and finally solved by a low-complexitydistributed method. Simulation results show that theproposed distributed algorithm significantly improves thenetwork throughput and energy efficiency compared withprevious algorithms.
Wei Huang,Shenglai Yang,Zhilin Wang,Xiaowei Lv,Hao Lei,Li Chen 한국자원공학회 2014 Geosystem engineering Vol.17 No.6
To improve the ultimate recovery of reservoirs and to increase the economic benefit of oilfields, we feel obliged to study on various factors affecting the development effect of hydrocarbon gas injection and its influence in terms of ultimate recovery. Thus, we can formulate a reasonable and feasible scheme on effective implementation of hydrocarbon gas drive. Take Q28 fault-block as an example; five main factors affecting the development effect of hydrocarbon gas injection have been screened out, four different levels of each influence factor has been set up; the orthogonal experiment method has been adopted to design 16 different combination schemes of 5 factors. Numerical reservoir simulation predicted the final recovery under the different combination schemes. Following are the range analysis and variance analysis of entire results so that the major and minor factors affecting the final recovery and the best range of each factor can be confirmed. The order sequence from major to minor factors: gas injection slug size, gas injection time, gas–water ratio, pressure level, and injection rate. This method is significant on its guidance for hydrocarbon gas injection in this area.
Fei Xiaowei,Dou Ya-nan,Sun Kai,Wei Jialiang,Guo Qingdong,Wang Li,Wu Xiuquan,Lv Weihao,Jiang Xiaofan,Fei Zhou 생화학분자생물학회 2023 Experimental and molecular medicine Vol.55 No.-
The tripartite motif (TRIM) 22 and mitogen-activated protein kinase (MAPK) signaling pathways play critical roles in the growth of glioblastoma (GBM). However, the molecular mechanism underlying the relationship between TRIM22 and MAPK signaling remains unclear. Here, we found that TRIM22 binds to exon 2 of the sphingosine kinase 2 (SPHK2) gene. An ERK1/2-driven luciferase reporter construct identified TRIM22 as a potential activator of MAPK signaling. Knockout and overexpression of TRIM22 regulate the inhibition and activation of MAPK signaling through the RING-finger domain. TRIM22 binds to Raf-1, a negative regulator of MAPK signaling, and accelerates its degradation by inducing K48-linked ubiquitination, which is related to the CC and SPRY domains of TRIM22 and the C1D domain of Raf-1. In vitro and in vivo, an SPHK2 inhibitor (K145), an ERK1/2 inhibitor (selumetinib), and the nonphosphorylated mutant Raf-1S338A inhibited GBM growth. In addition, deletion of the RING domain and the nuclear localization sequence of TRIM22 significantly inhibited TRIM22-induced proliferation of GBM cells in vivo and in vitro. In conclusion, our study showed that TRIM22 regulates SPHK2 transcription and activates MAPK signaling through posttranslational modification of two critical regulators of MAPK signaling in GBM cells.
NONADDITIVE STRONG COMMUTATIVITY PRESERVING DERIVATIONS AND ENDOMORPHISMS
Zhang, Wei,Xu, Xiaowei Korean Mathematical Society 2014 대한수학회보 Vol.51 No.4
Let S be a nonempty subset of a ring R. A map $f:R{\rightarrow}R$ is called strong commutativity preserving on S if [f(x), f(y)] = [x, y] for all $x,y{\in}S$, where the symbol [x, y] denotes xy - yx. Bell and Daif proved that if a derivation D of a semiprime ring R is strong commutativity preserving on a nonzero right ideal ${\rho}$ of R, then ${\rho}{\subseteq}Z$, the center of R. Also they proved that if an endomorphism T of a semiprime ring R is strong commutativity preserving on a nonzero two-sided ideal I of R and not identity on the ideal $I{\cup}T^{-1}(I)$, then R contains a nonzero central ideal. This short note shows that the conclusions of Bell and Daif are also true without the additivity of the derivation D and the endomorphism T.
SKEW n-DERIVATIONS ON SEMIPRIME RINGS
Xu, Xiaowei,Liu, Yang,Zhang, Wei Korean Mathematical Society 2013 대한수학회보 Vol.50 No.6
For a ring R with an automorphism ${\sigma}$, an n-additive mapping ${\Delta}:R{\times}R{\times}{\cdots}{\times}R{\rightarrow}R$ is called a skew n-derivation with respect to ${\sigma}$ if it is always a ${\sigma}$-derivation of R for each argument. Namely, if n - 1 of the arguments are fixed, then ${\Delta}$ is a ${\sigma}$-derivation on the remaining argument. In this short note, from Bre$\check{s}$ar Theorems, we prove that a skew n-derivation ($n{\geq}3$) on a semiprime ring R must map into the center of R.