http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
ON THE SEPARATION OF LINEAR CONSTANT-WEIGHT CODES
Liu, Zihui Korean Mathematical Society 2016 대한수학회보 Vol.53 No.1
By using the finite projective geometry method, the separating properties of linear constant-weight codes are presented. An algorithm is given for computing the cardinality of separating coordinate positions of certain disjoint codeword sets of linear constant-weight codes.
COMPLETE WEIGHT ENUMERATORS OF SOME CLASSES OF LINEAR CODES WITH A FEW WEIGHTS
Liu, Yiwei,Liu, Zihui Korean Mathematical Society 2018 대한수학회보 Vol.55 No.3
By choosing defining set properly, several classes of linear codes with a few weights over the finite field ${\mathbb{F}}_p$ are constructed for an odd prime p, and the complete weight enumerators of these classes of codes are determined.
Stochastic PWM methods to inhibit junction temperature rise in IGBT module
Zihui Liu,Jiaqing Ma,Zhiqin He,Qinmu Wu 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.4
The insulated gate bipolar transistor (IGBT) module is a core component of high-power electronic device systems. Since the junction temperature of an IGBT module increases with operation, the junction temperature of the IGBT module is the main cause of failure, which seriously affects the safe and stable operation of systems. To restrain the junction temperature and to improve the reliability of IGBT modules during operation, a new stochastic pulse width modulation (PWM) strategy is proposed. It is deduced that this method can do a good job of restraining the junction temperature of IGBT modules. The effectiveness of this method is verified on an experimental platform of a permanent magnet synchronous motor system. Experimental results show that the stochastic PWM has a good inhibitory effect on the junction temperature of IGBT modules in the same cycle, and that the difference of the most significant inhibition effect is about 3.27 K. The proposed stochastic PWM has practical engineering significance in terms of restraining the junction temperature of IGBT modules.
On the separation of linear constant-weight codes
Zihui Liu 대한수학회 2016 대한수학회보 Vol.53 No.1
By using the finite projective geometry method, the separating properties of linear constant-weight codes are presented. An algorithm is given for computing the cardinality of separating coordinate positions of certain disjoint codeword sets of linear constant-weight codes.
Complete weight enumerators of some classes of linear codes with a few weights
Yiwei Liu,Zihui Liu 대한수학회 2018 대한수학회보 Vol.55 No.3
By choosing defining set properly, several classes of linear codes with a few weights over the finite field $\mathbb{F}_{p}$ are constructed for an odd prime $p$, and the complete weight enumerators of these classes of codes are determined.
Tingting Zhang,Zihui Li,Ya Liu,Kangjia Ding,Yangfeng Guo,Yiyang Xu,Mengfan Sun,Dongfang Wang,Qian Li 한국섬유공학회 2023 Fibers and polymers Vol.24 No.12
Polytetrafluoroethylene (PTFE) nano-porous membrane has been widely used in various fields due to its excellent thermal stability and chemical stability. However, PTFE nanofiber membranes with simultaneous hydrophobic and oleophobic properties are essential to promote the application of PTFE. Here, based on inorganic/organic nanohybridization, we report a strategy for constructing nanostructures on fibers by adding nanoparticles, such as MOF and ZrO2. The results of FTIR and XRD confirmed MOF was synthesized successfully. At the same time, the SEM results showed UiO-66-(COOH)2 is spherical with an average diameter of 152 nm, and there is no agglomeration, which is suitable for electrospinning. Further, MOF and ZrO2 were payload into PTFE nanofibers. The results of SEM and AFM confirmed nanostructures will be more uniform and pronounced with the increase of UiO-66-(COOH)2 content, and nanostructures are most obvious when the content of UiO-66-(COOH)2 is 15%. The introduced nanostructures can increase the oil contact angle of the PTFE nano-porous membrane to 110° without introducing other groups, and further improve the water contact angle from 133° to 145°. Meanwhile, the introduction of a certain amount of hydrophilia groups can increase the oil contact angle to more than 120°. The simple strategy is of great significance to expand the application of PTFE fiber membrane in dealing with waste water treatment fields.
THE t-WISE INTERSECTION OF RELATIVE THREE-WEIGHT CODES
Li, Xin,Liu, Zihui Korean Mathematical Society 2017 대한수학회보 Vol.54 No.4
The t-wise intersection is a useful property of a linear code due to its many applications. Recently, the second author determined the t-wise intersection of a relative two-weight code. By using this result and generalizing the finite projective geometry method, we will present the t-wise intersection of a relative three-weight code and its applications in this paper.
The t-wise intersection of relative three-weight codes
Xin Li,Zihui Liu 대한수학회 2017 대한수학회보 Vol.54 No.4
The $t$-wise intersection is a useful property of a linear code due to its many applications. Recently, the second author determined the $t$-wise intersection of a relative two-weight code. By using this result and generalizing the finite projective geometry method, we will present the $t$-wise intersection of a relative three-weight code and its applications in this paper.
New results on the pseudoredundancy
Marcus Greferath,Zihui Liu,Xin-Wen Wu,Jens Zumbragel 대한수학회 2019 대한수학회보 Vol.56 No.1
The concepts of pseudocodeword and pseudoweight play a fundamental role in the finite-length analysis of LDPC codes. The pseudoredundancy of a binary linear code is defined as the minimum number of rows in a parity-check matrix such that the corresponding minimum pseudoweight equals its minimum Hamming distance. By using the value assignment of Chen and Kl\o ve we present new results on the pseudocodeword redundancy of binary linear codes. In particular, we give several upper bounds on the pseudoredundancies of certain codes with repeated and added coordinates and of certain shortened subcodes. We also investigate several kinds of $k$-dimensional binary codes and compute their exact pseudocodeword redundancy.
NEW RESULTS ON THE PSEUDOREDUNDANCY
Greferath, Marcus,Liu, Zihui,Wu, Xin-Wen,Zumbragel, Jens Korean Mathematical Society 2019 대한수학회보 Vol.56 No.1
The concepts of pseudocodeword and pseudoweight play a fundamental role in the finite-length analysis of LDPC codes. The pseudoredundancy of a binary linear code is defined as the minimum number of rows in a parity-check matrix such that the corresponding minimum pseudoweight equals its minimum Hamming distance. By using the value assignment of Chen and Kløve we present new results on the pseudocodeword redundancy of binary linear codes. In particular, we give several upper bounds on the pseudoredundancies of certain codes with repeated and added coordinates and of certain shortened subcodes. We also investigate several kinds of k-dimensional binary codes and compute their exact pseudocodeword redundancy.