Sparse Reconfigurable Adaptive Filter with an Upgraded Connection Constraint Algorithm

Chang, Hong,Hwang, Suk-Seung Korean Institute of Intelligent Systems 2011 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.11 No.4

A sparse reconfigurable adaptive filter (SRAF) based on a photonic switch determines the appropriate time delays and weight values for an optical switch implementation of tapped-delay-line (TDL) systems. It is well known that the choice of switch delays is significantly important for efficiently implementing the SRAF. If the same values exist as calculating the sum of weight magnitudes for implementing the connection constraint required by the SRAF, conventional connection algorithm based on sequentially selection the maximum elements might not work perfectly. In an effort to increase the effectiveness of system identification, an upgraded connection algorithm used progressive calculation to obtain the better solution is considered in this paper. The performance of the proposed connection constraint algorithm is illustrated by computer simulation for a system identification application.

Study on Mud-Water Separation Test Technology for Shield Slurry in Underground Tunnel

( Changhong Yan ),( Shulan Guo ),( Liang Wen ),( Liangwei Li ),( Xiaoyong Yang ),( Zhiwei Jin ),( Xuyang Fan ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2

The construction of urban subway produced a large amount of slurry with hign moisture content. In order to ensure the stability of the excavation face during the construction of the tunnel shield, prevent the spoil from adhering to the shield cutter, a large amount of additives such as water, bentonite, foaming agent are added to the spoil. Therefore, the slurry has the characteristics of uneven particle composition, high moisture content, low permeability and remarkable plastic flow, and its shear strength is almost zero. The transportation and stacking of slurry can cause environmental pollution and damage the ecological environment. To solve this problem, our research team developed a set of mud-water separation test device to carry out research on mud-water separation technology. The Optimal treatment plan for mud-water separation is given by a large number of laboratory tests: when the moisture content of slurry is relatively high, the vacuum negative pressur is firstly used to discharge the free water. When the moisture content drops below the liquid limit, the electroosmosis and the vacuum negative pressure are combined to discharge the bound water, at which time the moisture content in the slurry is close to the plastic limit, thereby achieving slurry hardening. This method has a fast drainage speed and low cost, and has been successfully applied to the Suzhou Metro. It is not only conducive to the resource utilization of slurry, but more importantly, it can effectively protect the ecological environment.

Low-power Technologies for Wearable Telecare and Telehealth Systems: A Review

Changhong Wang,Wei Lu,Michael R. Narayanan,Stephen J. Redmond,Nigel H. Lovell 대한의용생체공학회 2015 Biomedical Engineering Letters (BMEL) Vol.5 No.1

Wearable telecare and telehealth systems are those which canbe worn on the human body and continuously monitor auser’s vital status. Even though these systems have alreadyshown promise in applications for improving medical servicequality and reducing medical costs, a short battery lifesignificantly restricts the widespread use of these systems. Low-power technologies (a general name for technologieswhich use various approaches to reduce the power consumptionof the associated electronics) can help alleviate thisdisadvantage of wearable telecare and telehealth systems. Inthis paper, we review recent developments and applicationsof low-power technologies in wearable telecare and telehealthsystems, sorting the various approaches into two categories:hardware-based approaches and firmware-based approaches. This paper focuses on illustrating how to realize theseapproaches but does not provide a quantitative analysis ofdifferent approaches, since the intended applications of theseapproaches are quite different, hence numeric comparison isnot meaningful. Given the proliferation of wearable telecareand telehealth systems, there will be a greater emphasis onthe development of low-power technologies in this field.

Upregulation of long non-coding RNA XIST has anticancer effects on epithelial ovarian cancer cells through inverse downregulation of hsa-miR-214-3p

Changhong Wang,Shan Qi,Cheng Xie,Chunfu Li,Pu Wang,Dongmei Liu 대한부인종양학회 2018 Journal of Gynecologic Oncology Vol.29 No.6

Objective: The present study is to evaluate the biological functions of long non-coding RNA (lncRNA), X-inactive specific transcript, X-inactive specific transcript (XIST) in human epithelial ovarian cancer (EOC). Methods: XIST was upregulated in EOC cell lines, CAOV3 and OVCAR3 cells by lentiviral transduction. The effects of XIST overexpression on cancer cell proliferation, invasion, chemosensitivity and in vivo tumor growth were investigated, respectively. Possible sponging interaction between XIST and human microRNA hsa-miR-214-3p was further evaluated. Furthermore, hsa-miR-214-3p was overexpressed in XIST-upregulated CAOV3 and OVCAR3 cells to evaluate its effect on XIST-mediated EOC regulation. Results: Lentivirus-mediated XIST upregulation had significant anticancer effects in CAOV3 and OVCAR3 cells by suppressing cancer cell proliferation, invasion, increasing cisplatin chemosensitivity and inhibiting in vivo tumor growth. Hsa-miR-214-3p was confirmed to directly bind XIST, and inversely downregulated in XIST-upregulated EOC cells. In EOC cells with XIST upregulation, secondary lentiviral transduction successfully upregulated hsa-miR-214-3p expression. Subsequently, hsa-miR-214-3p upregulation functionally reversed the anticancer effects of XIST-upregulation in EOC. Conclusion: Upregulation of lncRNA XIST may suppress EOC development, possibly through sponging effect to induce hsa-miR-214-3p downregulation.

Investigation on the seismic performance of T-shaped column joints

Changhong Chen,He Gong,Yao Yao,Ying Huang,Leon M. Keer 사단법인 한국계산역학회 2018 Computers and Concrete, An International Journal Vol.21 No.3

More and more special-shaped structural systems have been widely used in various industrial and civil buildings in order to satisfy the new structural system and the increasing demand for architectural beauty. With the popularity of the specialshaped structure system, its seismic performance and damage form have also attracted extensive attention. In the current research, an experimental analysis of six groups of (2/3 scale) T-shaped column joints was conducted to investigate the seismic performance of T-shaped column joints. Effects of the beam cross section, transverse stirrup ratio and axial compression ratio on bearing capacity and energy dissipation capacity of column joints were obtained. The crack pattern of T-shaped column joints under low cyclic load was presented and showed a reversed “K” mode. According to the crack configurations, a tensile-shear failure model to determine the shear bearing capacity and crack propagation mechanisms is developed.

A Sphere Filling Algorithm for Irregular Aggregate Particle Generation based on Nonlinear Optimization Method

Changhong Zhou,Hongzhi Yue,Yuhua Li,Miaomiao Zhang,Jiayin Liu,Shahroz Aijaz 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.1

The angularity of particles has important effects on the mechanical properties of asphalt mixture and other granular materials. To simulate these effects, the glue-sphere method was usually used to create an arbitrary polyhedron particle. Unlike other studies, this paper aims to efficiently fill a polyhedron with as few spheres as possible through optimization technology in order to reduce the cost of calculation during mixture simulation. Four contents are mainly discussed here: a) how to produce non-spherical aggregates and control their sizes with the minimal bounding box; b) how to fill convex non-spherical particles with the fewest balls as possible using the constrained nonlinear optimization method; c) how to compute the typical shape factors of these particles; and d) how the control parameters affect the filling effect. The algorithm for this study was programmed by MATLAB software and was proven to have better filling performance and less computational cost compared to other methods.

Research on Mechanism of Temporary Confined Groundwater in the Intermittent Creep Landslide in Ningzhen Area

( Changhong Yan ),( Shulan Guo ),( Jinzhong Tan ),( Yang Liu ),( Baotian Xu ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2

In recent years, due to the influence of extreme heavy rainfall weather, many large scale landslides occurred on the gentle slopes in Ningzhen area, which characteristically intermittent creep, large scale, and small slip distance (generally less than 30 m). The surface of gentle slope is dominated by fine-grained soil, while the middle and lower layers are dominated by coarse-grained soil, gravel or weathered rockmass, forming a special "binary stratigraphic structure" and the permeability of the soil layer is weak-strong-weak from top to bottom. Under the condition of heavy rainfall weather extremes, the bare rockmass fracture of upper mountain in favor of rainfall infiltration. The middle mountain by precipitation process prone to circular sliding, the lower part of the gentle slope is easy to form “Temporary confined groundwater”, which is prone to landslide under the combined with downslide force of the middle slide body. Based on this new type of landslide geological hazard, the stratum structure and sliding mechanism of the landslide had been researched by using the cybernetics of rockmass structure and preferred plane theory.

3D PIC Method for Modeling and Simulating the Beam Transport System of a Linear Induction Accelerator

Yang Changhong,Meng Lin,Liu Da Gang,Zhang Kaizhi,Liao Shuqing,Dai Zhiyong 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.61

Firstly, the method of combining the finite difference time domain with particle-in-cell code is used for simulating and modeling a accelerated section of the LIA, and on this basis, the numerical simulation of the solenoid coils and steering coils in accelerated section are completed by writing independent calculation module of magnetic components ,then on the platform of the MPICH2 message passing system, a proper method for parallel computing of more accelerate sections is provided and solved LIA's great scale problems. Finally, the 18 accelerated sections was simulated by the software, and compared with the envelope diagram of documents, which proved the correctness of the method used.

Dodecagonal tiling in mesoporous silica

Xiao, Changhong,Fujita, Nobuhisa,Miyasaka, Keiichi,Sakamoto, Yasuhiro,Terasaki, Osamu Nature Publishing Group, a division of Macmillan P 2012 Nature Vol.487 No.7407

Recent advances in the fabrication of quasicrystals in soft matter systems have increased the length scales for quasicrystals into the mesoscale range (20 to 500 책ngstr철ms). Thus far, dendritic liquid crystals, ABC-star polymers, colloids and inorganic nanoparticles have been reported to yield quasicrystals. These quasicrystals offer larger length scales than intermetallic quasicrystals (a few 책ngstr철ms), thus potentially leading to optical applications through the realization of a complete photonic bandgap induced via multiple scattering of light waves in virtually all directions. However, the materials remain far from structurally ideal, in contrast to their intermetallic counterparts, and fine control over the structure through a self-organization process has yet to be attained. Here we use the well-established self-assembly of surfactant micelles to produce a new class of mesoporous silicas, which exhibit 12-fold (dodecagonal) symmetry in both electron diffraction and morphology. Each particle reveals, in the 12-fold cross-section, an analogue of dodecagonal quasicrystals in the centre surrounded by 12 fans of crystalline domains in the peripheral part. The quasicrystallinity has been verified by selected-area electron diffraction and quantitative phason strain analyses on transmission electron microscope images obtained from the central region. We argue that the structure forms through a non-equilibrium growth process, wherein the competition between different micellar configurations has a central role in tuning the structure. A simple theoretical model successfully reproduces the observed features and thus establishes a link between the formation process and the resulting structure.

음향방출 기술을 이용한 상수도 배관 누수검출 알고리즘

정창홍(Changhong Jeong),정인규(Inkyu Jeong),김종면(Jong-Myon Kim) 한국컴퓨터정보학회 2018 한국컴퓨터정보학회 학술발표논문집 Vol.26 No.2