Performance of Cross‑Linked Polyethylene Insulated Cable Based on Detection of High Voltage Electric Field

Yong Luo,Jiawei Luo,Bin Li 한국전기전자재료학회 2019 Transactions on Electrical and Electronic Material Vol.20 No.1

High voltage direct current transmission has been widely used in long-distance power transmission because of its advantages such as low loss and large throughput. The safety of cable is very important in the long-distance transmission process. Cross-linked polyethylene insulated cable has the advantages of simple manufacture, good heat resistance and easy installation; therefore it has been widely used in long-distance power transmission. In this study, conductance, dielectric and voltage withstanding performance of the insulating layers of cross-linked polyethylene cables with working voltage of 220 kV which was never used and has been used for 2, 4, 6 and 8 years were tested by various evaluation methods. The conductivity of the insulating layers was affected by temperature only under high and low electric field intensities and wasaffected by temperature and electric field strength under middle electric field intensity. Dielectric loss factor could reflect dielectric properties of materials; the larger the dielectric loss factor, the poorer the performance. The dielectric loss factor decreased with the increase of applied electric field frequency and increased with the increase of service years. Breakdown electric field strength could reflect voltage resistance of materials; the larger the breakdown electric field strength, the better the performance. The breakdown electric field strength was inversely proportional to the service years of the insulating layer, and the decrease amplitude increased significantly when the service time exceeded 2 years. In summary, cross-linked polyethylene insulated material satisfies the safety requirement of high voltage direct current transmission and can be usedfor manufacturing long-distance transmission cables.

Executive Compensation, Ownership Structureand Firm Performance in Chinese Financial Corporations

Yongli Luo,Dave O.Jackson 사람과세계경영학회 2012 Global Business and Finance Review Vol.17 No.1

Executive compensation in the U.S. banking industry has been criticized as a root cause of the recent financial crisis. This study examines the relationship between executive compensation, ownership structure, and firm performance for Chinese financial corporations during 2001- 2009. The results reveal that executive compensation in Chinese banks follows a relation-based rather than a market-based contract. There is little evidence in support of the pay-for- performance setting for Chinese executive compensation. Ownership concentration has significantly negative impacts while firm size has significantly positive impacts on CEO compensation. Further, the involvement of state ownership tends to limit executive compensation, while the compensation committee is friendly and enhances management compensation. The results suggest that the government or regulation may ensure efficient corporate governance in business activity as a helping hand when corporate governance is weak.

Autophagy Inhibition Promotes Gambogic Acid-induced Suppression of Growth and Apoptosis in Glioblastoma Cells

Luo, Guo-Xuan,Cai, Jun,Lin, Jing-Zhi,Luo, Wei-Shi,Luo, Heng-Shan,Jiang, Yu-Yang,Zhang, Yong Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.12

Objective: To investigate the effects of gambogic acid (GA) on the growth of human malignant glioma cells. Methods: U251MG and U87MG human glioma cell lines were treated with GA and growth and proliferation were investigated by MTT and colony formation assays. Cell apoptosis was analyzed by annexin V FITC/PI flow cytometry, mitochondrial membrane potential assays and DAPI nuclear staining. Monodansylcadaverine (MDC) staining and GFP-LC3 localisation were used to detect autophagy. Western blotting was used to investigate the molecular changes that occurred in the course of GA treatment. Results: GA treatment significantly suppressed cell proliferation and colony formation, induced apoptosis in U251 and U87MG glioblastoma cells in a time- and dose-dependent manner. GA treatment also lead to the accumulation of monodansylcadaverine (MDC) in autophagic vacuoles, upregulated expressions of Atg5, Beclin 1 and LC3-II, and the increase of punctate fluorescent signals in glioblastoma cells pre-transfected with GFP-tagged LC3 plasmid. After the combination treatment of autophagy inhitors and GA, GA mediated growth inhibition and apoptotic cell death was further potentiated. Conclusion: Our results suggested that autophagic responses play roles as a self-protective mechanism in GA-treated glioblastoma cells, and autophagy inhibition could be a novel adjunctive strategy for enhancing chemotherapeutic effect of GA as an anti-malignant glioma agent.

이동통신망에서 위치등록 방법의 성능 비교

Luo Yong,Baek Woon-Young 한국정보기술응용학회 2007 한국정보기술응용학회학술대회 Vol.2007 No.1

A Single Chord Localization Algorithm for Wireless Sensor Networks

Yong-Luo Shen,Yuan Zhang,Yu-Ping Hu,Jun Zhang 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.1

This paper presents a novel range-free single chord localization algorithm with low energy consumption and high accuracy for wireless sensor networks. A mobile anchor node and a mobile reference node are employed to periodically broadcast beacon messages and reference messages, respectively. Each sensor node is equipped with a received signal strength indicator for comparing the signal strength. By using the edge function and the result of comparing signal strength, each sensor node only needs one chord on the communication circle for localization. Compared with previous approaches that require multiple chords, less beacon messages are required by the sensor nodes. In the proposed algorithm, the localization error mainly depends on the move distance interval. However, for the other approaches, large localization errors can be observed according to the angle between chords which may descend the localization accuracy dramatically. Analysis results indicate that the proposed algorithm is superior to other approaches in energy consumption and localization accuracy.

An Optimal Energy Storage Operation Scheduling Algorithm for a Smart Home Considering Life Cost of Energy Storage System

Luo Yan,Min-Kyu Baek,Jong-Bae Park,Yong-Gi Park,Jae Hyung Roh 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.4

This paper presents an optimal operation scheduling algorithm for a smart home with energy storage system, electric vehicle and distributed generation. The proposed algorithm provides the optimal charge and discharge schedule of the EV and the ESS. In minimizing the electricity costs of the smart home, it considers not only the cost of energy purchase from the grid but also the life cost of batteries. The life costs of batteries are calculated based on the relation between the depth of discharge and life time of battery. As the life time of battery depends on the charge and discharge pattern, optimal charge and discharge schedule should consider the life cost of batteries especially when there is more than one battery with different technical characteristics. The proposed algorithm can also be used for optimal selection of size and type of battery for a smart home.

Effect of gelatin nano-coating containing Gardenia pigment on the preservation of pork slices

Yong Liu,Zi-Hao Liu,Chang-Qi Luo,Chun-Tao Xiao,Wen-Yu Zhou,Wen-Jin Xie 한국식품과학회 2022 Food Science and Biotechnology Vol.31 No.4

The nano-coating composed of gelatin and Gardenia pigment (GP) was successfully prepared and showed strong antioxidant activity. The average particle sizes of the nano-coating containing 0.1% and 0.3% GP were 269.58 and 394.13 nm, respectively. The pork slices uncoated and coated with the nano-coating were preserved at 4 C for 15 days. The pork slices’ pH, total volatile basic nitrogen (TVB-N), total viable counts (TVC), water-bind- ing capacity (WHC), and thiobarbituric acid reactive sub- stances (TBARS) were measured to assess the preservation effect of the nano-coating. The results showed that the pork coated with the nano-coating had lower pH, TVC, TVB-N, TBARS, and higher WHC, significantly different (p \ 0.05) than the uncoated pork. It is suggested that the proposed nano-coating can be used to effectively improve the pork’s quality and shelf life during refrigeration storage.

A general closed-form solution to a Timoshenko beam on elastic foundation under moving harmonic line load

Luo, Wei-Li,Xia, Yong,Zhou, Xiao-Qing Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.66 No.3

In this paper, a general closed-form solution for evaluating the dynamic behavior of a Timoshenko beam on elastic foundation under a moving harmonic line load is formulated in the frequency-wavenumber domain and in a moving coordinate system. It is found that the characteristic equation is quartic with real coefficients only, and its poles can be presented explicitly. This enables the substitution of these poles into Cauchy's residue theorem, leading to the general closed-form solution. The solution can be reduced to seven existing closed-form solutions to different sub-problems and a new closed-form solution to the subproblem of a Timoshenko beam on an elastic foundation subjected to a moving quasi-static line load. Two examples are included to verify the solution.

Organizational Change and Employee Satisfaction in the Post Cross-border M&A Integration in Korea

Yong Suhk Pak(박용석),Han Luo(나함),Yi Yang(양이) 한국경영학회 2015 經營學硏究 Vol.44 No.6

Most existing studies related to the human side of M&A present a negative perspective on organizational change resulting from post-M&A integration, considering it to be an important factor in job dissatisfaction for acquired employees. In this paper, we challenge this negative viewpoint and focus instead on the positive effects of organizational change resulting from post-M&A integration on employee satisfaction in the Korean context. We investigate the moderating mechanisms underlying effective participation on the part of employees and their trust in management. A survey was conducted of employees from 15 Korean companies that had been acquired by foreign companies. Based on the responses from 263 respondents, we found an inverted U-shaped relationship between the degree of restructuring that takes place after M&A and the job satisfaction of acquired employees, indicating that Korean employees do not necessarily reject change. Also, trust and participation during the integration process positively moderate the relationship between restructuring and acquired employees’ job satisfaction. A discussion of the results and some managerial implications are also provided.

Finite Difference Based Iterative Learning Control with Initial State Learning for Fractional Order Linear Systems

Yong-Hong Lan,Bin Wu,Yi-Ping Luo 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.2

This paper presents a PI-type iterative learning control (ILC) law with initial state learning for a class of α (0 < α ≤ 1) fractional order linear systems. First, by using backward difference method, the finite difference approximation of the fractional order derivative is obtained, which leads to globally 2−α order accuracy. Then, a PIILC law is constructed at the nodes and the convergence analysis of the iterative scheme is proved. A new sufficient condition is derived to guarantee that the tracking error is asymptotical convergent. The obtained convergence condition is fractional order dependent and is less conservative than the existing one. Most of the classical ILC conditions for fractional order linear systems fall into the special case of this paper. Finally, the simulation results show the effectiveness of the proposed control method.