SaaS application mashup based on High Speed Message Processing

Zhiguo Chen,Myoungjin Kim,Yun Cui 한국인터넷정보학회 2022 KSII Transactions on Internet and Information Syst Vol.16 No.5

Diversified SaaS applications allow users more choices to use, according to their own preferences. However, the diversification of SaaS applications also makes it impossible for users to choose the best one. Furthermore, users can't take advantage of the functionality between SaaS applications. In this paper, we propose a platform that provides an SaaS mashup service, by extracting interoperable service functions from SaaS-based applications that independent vendors deploy and supporting a customized service recommendation function through log data binding in the cloud environment. The proposed SaaS mashup service platform consists of a SaaS aggregation framework and a log data binding framework. Each framework was concreted by using Apache Kafka and rule matrix-based recommendation techniques. We present the theoretical basis of implementing the high-performance message-processing function using Kafka. The SaaS mashup service platform, which provides a new type of mashup service by linking SaaS functions based on the above technology described, allows users to combine the required service functions freely and access the results of a rich service-utilization experience, using the SaaS mashup function. The platform developed through SaaS mashup service technology research will enable various flexible SaaS services, expected to contribute to the development of the smart-contents industry and the open market.

Sensorless Control of Wound Rotor Synchronous Machines Based on High-frequency Signal Injection into the Stator Windings

Zhiguo Chen,Xianming Deng,Kun Huang,Wenhuan Zhen,Lei Wang 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.4

This paper proposes a sensorless control approach for Wound Rotor Synchronous Machines (WRSMs) based on a high frequency voltage signal injection into the stator side U phase and VW line, respectively. Considering the machine itself as a rotor position sensor, the rotor position observer is established according to the principles of the rotary transformer. A demodulation method for the high frequency signal inducted in the rotor is proposed as well. Simulation and experimental results show that the proposed sensorless control approach has high performance and good practicability.

Sensorless Control of Wound Rotor Synchronous Machines Based on High-frequency Signal Injection into the Stator Windings

Chen, Zhiguo,Deng, Xianming,Huang, Kun,Zhen, Wenhuan,Wang, Lei The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.4

This paper proposes a sensorless control approach for Wound Rotor Synchronous Machines (WRSMs) based on a high frequency voltage signal injection into the stator side U phase and VW line, respectively. Considering the machine itself as a rotor position sensor, the rotor position observer is established according to the principles of the rotary transformer. A demodulation method for the high frequency signal inducted in the rotor is proposed as well. Simulation and experimental results show that the proposed sensorless control approach has high performance and good practicability.

초기 유학의 우애(友愛) 윤리의 범위, 기능 및 지위

陳治國(Zhiguo, Chen) 새한철학회 2020 哲學論叢 Vol.100 No.2

초기 유학에서 구상한 윤리, 정치질서 체계 가운데, 우(友) 혹은 우애(友愛)윤리는 일종의 비(非)혈연 친정(亲情)적인 기본 사회 관계로서, 설령 가족 관계와 더불어 모종의 연속성, 유비성이 존재하였으나, 그것은 확실히 환원되거나 대체될 수 없는 몇몇 독특한 구조와 특징, 그리고 기능을 가지고 있었다. 이것은 개체 덕성의 충분한 발전과 자아 실현의 촉진 소재이자 방식이었으며, 아울러 가정과 사회 내지 천하를 잇는 중요한 매개체였다. 그러나, 우애윤리는 비록 일련의 상황 아래에서 군신(君臣)의 정치관계에 스며들거나 혹은 그것을 초월할 수 있었으나, 전체 윤리, 정치질서의 근본 기초로서의 가정관계를 극복하거나 대체하는 경우는 거의 없었다. 이 외에, 초기 유학의 우애윤리는 비록 여전히 각종 적용성과 동기적 요소를 갖추고 있긴 했지만, 그러나 자신의 연혁과 발전을 더욱 잘 실현하기 위해서, 또는 해당 시대와 세계에 더욱 공헌하기 위해서 또한 더욱 개방적으로, 자각적으로 기타 제자학파(諸子學派)의 우애윤리 관념을 받아들이고 배울 필요가 있었다. In the early Confucian politic-ethical order as a whole, friendship ethic being a basic social relation without blood kinship has certain continuity and analogy with family relations. However, friendship relation has clearly some irreducible, irreplaceable and unique structures, features and functions. It is not only the way and locus in which one could win the full development of individual virtue and self-realization, but also the important medium communicating family and society and even the world under heaven. Nevertheless, although the ethic of friendship could penetrate and even surpass the political relationship between monarch and minister in some cases, it is rarely allowed to overcome, replace or surpass the family relationship, which is regarded as the fundamental basis of the whole ethical and political order. In addition, the early Confucian ethic of friendship still has a variety of applicability and inspiration today, yet in order to better realize its own transformation and better contribute to the current era and world, it also needs to learn from other schools of thought more open and consciously.

직교평면분할 상의 효율적인 탈출 알고리즘

진치국(Zhiguo Chen),김성렬(Sung-Ryul Kim) 한국정보과학회 2013 한국정보과학회 학술발표논문집 Vol.2013 No.6

MiR-204 acts as a potential therapeutic target in acute myeloid leukemia by increasing BIRC6-mediated apoptosis

( Zhiguo Wang ),( Hong Luo ),( Zehui Fang ),( Yanling Fan ),( Xiaojuan Liu ),( Yujing Zhang ),( Shuping Rui ),( Yafeng Chen ),( Luojia Hong ),( Jincheng Gao ),( Mei Zhang ) 생화학분자생물학회 2018 BMB Reports Vol.51 No.9

Acute myeloid leukemia (AML) is one of the most common hematological malignancies all around the world. MicroRNAs have been determined to contribute various cancers initiation and progression, including AML. Although microRNA-204 (miR-204) exerts anti-tumor effects in several kinds of cancers, its function in AML remains unknown. In the present study, we assessed miR-204 expression in AML blood samples and cell lines. We also investigated the effects of miR-204 on cellular function of AML cells and the underlying mechanisms of the action of miR-204. Our results showed that miR-204 expression was significantly downregulated in AML tissues and cell lines. In addition, overexpression of miR-204 induced growth inhibition and apoptosis in AML cells, including AML5, HL-60, Kasumi-1 and U937 cells. Cell cycle analysis further confirmed an augmentation in theapoptotic subG1 population by miR-204 overexpression. Mechanistically, baculoviral inhibition of apoptosis protein repeat containing 6 (BIRC6) was identified as a direct target of miR-204. Enforcing miR-204 expression increased the luciferase activity and expression of BIRC6, as well as p53 and Bax expression. Moreover, restoration of BIRC6 reversed the pro-apoptotic effects of miR-204 overexpression in AML cells. Taken together, this study demonstrates that miR-204 causes AML cell apoptosis by targeting BIRC6, suggesting miR-204 may play an anti-carcinogenic role in AML and function as a novel biomarker and therapeutic target for the treatment of this disease. [BMB Reports 2018; 51(9): 444-449]

DYNAMIC MODELING OF BRAKE IN POWER-SPLIT DHT AND PRESSURE TRACKING CONTROL WITH SLIDING MODE VARIABLE STRUCTURE METHOD

Zhiguo Zhao,Mengna Li,Chen Wang,Lanxing Jiang,Maoyao Wang 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.3

Since the mode transition performance of power-split DHT (Dedicated Hybrid Transmission) are directly influenced by torque dynamic characteristic of the brake, the brake pressure should be controlled accurately. In this paper, a dynamic model of brake and its pressure regulating system are established by considering system nonlinear characteristics and input disturbances, and a sliding mode variable structure controller is developed to track the brake pressure. First, the operation principle of DHT's pressure regulating system is introduced. Second, the dynamic models of solenoid proportional pressure valve, electromagnetic direction switching valve and brake are established with AMESim parametric plant model. Furthermore, a sliding mode variable structure controller for tracking pressure is designed based on MATLAB/Simulink. Finally, the AMESim parametric plant model is validated by measurements, and the proposed controller are verified by AMESim and Simulink co-simulation. The results show that the system dynamics can be well characterized by the AMESim parametric plant model. The target pressure can be tracked rapidly and accurately by using sliding mode variable structure controller and the controller has better robustness.

The effective properties of saturated concrete healed by EDM with the ITZs

Qing Chen,Zhengwu Jiang,Hehua Zhu,J.W. Ju,Zhiguo Yan,Haoxin Li 사단법인 한국계산역학회 2018 Computers and Concrete, An International Journal Vol.21 No.1

A differential scheme based micromechanical framework is proposed to obtain the effective properties of the saturated concrete repaired by the electrochemical deposition method (EDM) considering the interfacial transition zone (ITZ) effects. The constituents of the repaired concrete are treated as different phases, consisting of (micro-)cracks, (micro-)voids and (micro-)pores (occupied by water), deposition products, intrinsic concrete made up by the three traditional solid phases (i.e., mortar, coarse aggregates and their interfaces) and the ITZs. By incorporating the composite sphere assemblage (CSA) model and the differential approach, a new multilevel homogenization scheme is utilized to quantitatively estimate the mechanical performance of the repaired concrete with the ITZs. The CSA model is modified to obtain the effective properties of the equivalent particle, which is a three-phase composite made up of the water, deposition products and the ITZs. The differential scheme is employed to reach the equivalent composite of the concrete repaired by EDM considering the ITZ effects. Moreover, modification procedures considering the ITZ effects are presented to attain the properties of the repaired concrete in the dry state. Results in this study are compared with those of the existing models and the experimental data. It is found that the predictions herein agree better with the experimental data than the previous models.

Diabetic Cardiomyopathy and Its Prevention by Nrf2: Current Status

Jing Chen,Zhiguo Zhang,Lu Cai 대한당뇨병학회 2014 Diabetes and Metabolism Journal Vol.38 No.5

Diabetic cardiomyopathy (DCM), as one of the major cardiac complications in diabetic patients, is known to related with oxidative stress that is due to a severe imbalance between reactive oxygen species (ROS) and/or reactive nitrogen species (RNS) generation and their clearance by antioxidant defense systems. Transcription factor nuclear factor NF-E2-related factor 2 (Nrf2) plays an important role in maintaining the oxidative homeostasis by regulating multiple downstream antioxidants. Diabetes may up-regulate several antioxidants in the heart as a compensative mechanism at early stage, but at late stage, diabetes not only generates extra ROS and/or RNS but also impairs antioxidant capacity in the heart, including Nrf2. In an early study, we have established that Nrf2 protect the cardiac cells and heart from high level of glucose in vitro and hyperglycemia in vivo, and in the following study demonstrated the significant down-regulation of cardiac Nrf2 expression in diabetic animals and patients. Using Nrf2-KO mice or Nrf2 inducers, blooming evidence has indicated the important protection by Nrf2 from cardiac pathogenesis in the diabetes. Therefore, this brief review summarizes the status of studies on Nrf2’s role in preventing DCM and even other complications, the need for new and safe Nrf2 inducer screening and the precaution for the undesirable side of Nrf2 under certain conditions.

The delamination of carbon fiber reinforced composites during cutting by flexible linear shaped charge

Jing Sun,Zhiguo Ma,Zhifeng Zhang,Fei Weng,Rong Chen 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.4

The delamination is a typical phenomenon when the carbon fiber reinforced composites (CFRC) undergoes blasting impact loading and the delamination will reduce both the strength and stiffness of the laminates, which can lead to catastrophic consequences while used as rocket skin. In this paper, the response of CFRC laminate is cut by flexible linear shaped charge (FLSC) and the delamination behavior of the CFRC is analyzed and discussed. The displacement interferometer system for any reflector (DISAR) is used to monitor the velocity of characteristic points of the laminate subjected to FLSC. Finite element analysis has been conducted to explain the mechanisms of delamination. Based on the numerical simulation, the influences of structural design parameters on the delamination effect of the CFRC after cutting are investigated. The results show that a large number of debris are produced at the center of the explosion and a small amount of large debris is produced at weakening groove on both sides. The delamination effect is greatly affected by the inter-laminar tensile strength and thickness of composite laminate, but it is not significantly affected by the linear density of the FLSC and stand-off.