Sulphonated Reduced Graphene Oxide: A High Performance Anode Material for Lithium Ion Battery

Haibo Li,Rui Niu,Sen Liang,Yulong Ma,Min Luo,Jin Li,Lijun He 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.4

In this work, the sulfonated reduced graphene oxide (SRGO) was synthesized and proposed as an enhanced anode material for lithium ion battery (LIB). The result shows that the SRGO has an improved battery performance (i.e., ~341.7 mAh/g and ~190.6 mAh/g corresponds to SRGO and RGO at the 100th cycle with a current density of 200 mA/g) and superior cycling stability compared with pristine reduced graphene oxide (RGO). These are attributed to the improved specific surface area (448.35 m2 /g) and conductivity (2.5 x 10-4 S/m). Further, the SRGO exhibits good rate capability and excellent energy density at various current densities ranging from 50 mAh/g to 2000 mAh/g, suggesting that SRGO could be a promising anode material for high capacity LIB.

Accelerated Cardiac Diffusion Tensor Imaging Using Joint Low-Rank and Sparsity Constraints

Ma, Sen,Nguyen, Christopher T.,Christodoulou, Anthony G.,Luthringer, Daniel,Kobashigawa, Jon,Lee, Sang-Eun,Chang, Hyuk-Jae,Li, Debiao IEEE 2018 IEEE Transactions on Biomedical Engineering Vol.65 No.10

<P>Objective: The purpose of this paper is to accelerate cardiac diffusion tensor imaging (CDTI) by integrating low-rankness and compressed sensing. Methods: Diffusion-weighted images exhibit both transform sparsity and low-rankness. These properties can jointly be exploited to accelerate CDTI, especially when a phase map is applied to correct for the phase inconsistency across diffusion directions, thereby enhancing low-rankness. The proposed method is evaluated both ex vivo and in vivo, and is compared to methods using either a low-rank or sparsity constraint alone. Results: Compared to using a low-rank or sparsity constraint alone, the proposed method preserves more accurate helix angle features, the transmural continuum across the myocardium wall, and mean diffusivity at higher acceleration, while yielding significantly lower bias and higher intraclass correlation coefficient. Conclusion: Low-rankness and compressed sensing together facilitate acceleration for both ex vivo and in vivo CDTI, improving reconstruction accuracy compared to employing either constraint alone. Significance: Compared to previous methods for accelerating CDTI, the proposed method has the potential to reach higher acceleration while preserving myofiber architecture features, which may allow more spatial coverage, higher spatial resolution, and shorter temporal footprint in the future.</P>

Mass Production and Diapause of Trichogramma in Dissected Eggs of Chinese Tussah Moth

Chun-Sen Ma 한국응용곤충학회 2014 한국응용곤충학회 학술대회논문집 Vol.2014 No.10

Trichogramma is widely used in biological control of many Lepidoptera insect pests in the world. Although many species of host eggs, e.g. Sitotroga cerealela, Corcyra cephalonica, Ephestia kuehniella, Mamestra brassicae and even artificial host eggs are explored in mass production of Trichogramma, eggs dissected from the ovaries in female of Chinese (Oak) tussah moth (Antheraea pernyi) are still the most popular host eggs in China. Here I introduce technology processes of Trichogramma mass production that are popularly used in China, including: 1) selecting female cocoons from mixed sexes commercial cocoons, 2) cold storage of cocoons, 3) warming up the cocoons, 4) collecting female moths and dissecting ovaries, 5) separating, washing and drying host eggs, 6) multiplying Trichogramma with the host eggs, 7) producing Trichogramma products, i.e. the host egg cards, 8) storing Trichogramma under low temperatures, 9) releasing Trichogramma in the field. Nevertheless, problems are frequently encountered in these processes, e.g. high mortality of long-term storage and multiplying too many generations etc. To solve these problems and explore a method for long-term storage, we studied the diapause of T. dendrolimi in detail. We found that the optimal processes for diapause induction were exposing hosts for parasitization at 26℃ for 8 h before keeping them at 26℃ for another 40 h, and finally moving them into 10℃ for 4 weeks. The optimal processes for diapause termination were setting the diapause Trichogramma under 1℃ for two months and then exposing them at 26℃ until their emergence.

CoVaR를 이용한 주식시장 리스크 변동에 관한 연구 - 한국과 중국 주식시장 비교 -

마학삼(Xue Sen Ma),김석태(Sok Tae Kim) 국제e-비즈니스학회 2020 e-비즈니스 연구 Vol.21 No.4

코로나19 이후 한국무역 환경 변화 및 한 · 중 무역 전망에 관한 연구

마학삼(Xue Sen Ma),김석태(Sok Tae Kim) 국제e-비즈니스학회 2021 e-비즈니스 연구 Vol.22 No.2

Privacy preserving in ubiquitous computing: Classification & hierarchy

Ma, Tinghuai,Yan, Sen,Wang, Jin,Lee, Sungyoung National Library of Serbia 2011 Computer science and information systems Vol.8 No.4

Plasma Post-operative miR-21 Expression in the Prognosis of Gastric Cancers

Ma, Guo-Jian,Gu, Rong-Min,Zhu, Ming,Wen, Xu,Li, Jin-Tian,Zhang, Yuan-Ying,Zhang, Xiao-Mei,Chen, Sen-Qing Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.12

Tumor-associated microRNAs have been detected in serum or plasma, but whether plasma microRNA-21 (miR-21) could be a potential circulating biomarker for gastric cancer (GC) prognosis in Chinese is still uncertain. Real-time quantitative reverse transcription PCR (qRT-PCR) was employed in this study to compare the relative expression of miR-21 between pre-operative and post-operative paired plasmas from 42 patients with primary GCs. The results showed that the expression levels of miR-21 in the post-operative plasmas were significantly reduced by an average of 18.2 times in all patients when compared to the pre-operative plasmas, and by 22.1 times in the subgroup of patients without family history, while only 1.76 times in the subgroup of patients with a family history. With respect of clinicopathological characteristics, the plasma miR-21 expression was highly associated with differentiation degree and lymph node metastasis rate. The results suggested plasma miR-21 could be a novel potential biomarker for GC prognosis and evaluation of surgery outcomes, especially in patients without a family history.

The Decoupled Active/Reactive Power Predictive Control of Quasi-Z-source Inverter for Distributed Generations

Dazhong Ma,Ke Cheng,Rui Wang,Sen Lin,Xiangpeng Xie 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.2

For the quasi-Z-source inverter (qZSI), capacitor voltage stability control, high performance of the inductor current reference tracking and fast response of the active/reactive power are key issues. Thus, a decoupled active/reactive power model predictive control (MPC) of the qZSI for distributed generations (DGs) is proposed to fulfill these requirements without additional control loops. Firstly, the digital observer is constructed to remove the utilization of the front voltage sensor and reduce the number of hardware equipment. Moreover, based on the advance determination of the system operation mode and the simplified cost function, the calculation complexity of the proposed MPC algorithm is simplified. Further, the proposed improved MPC method with the digital observer is proved to achieve the high accuracy and the zero prediction error, of which stability is demonstrated through Lyapunov stability criteria. Eventually, the proposed controller is compared with conventional MPC and PI controller in detail and its effectiveness is verified by both simulation and experimental results from a grid-connected qZSI.

Energy-Aware Virtual Data Center Embedding

( Xiao Ma ),( Zhongbao Zhang ),( Sen Su ) 한국정보처리학회 2020 Journal of information processing systems Vol.16 No.2

As one of the most significant challenges in the virtual data center, the virtual data center embedding has attracted extensive attention from researchers. The existing research works mainly focus on how to design algorithms to increase operating revenue. However, they ignore the energy consumption issue of the physical data center in virtual data center embedding. In this paper, we focus on studying the energy-aware virtual data center embedding problem. Specifically, we first propose an energy consumption model. It includes the energy consumption models of the virtual machine node and the virtual switch node, aiming to quantitatively measure the energy consumption in virtual data center embedding. Based on such a model, we propose two algorithms regarding virtual data center embedding: one is heuristic, and the other is based on particle swarm optimization. The second algorithm provides a better solution to virtual data center embedding by leveraging the evolution process of particle swarm optimization. Finally, experiment results show that our proposed algorithms can effectively save energy while guaranteeing the embedding success rate.

Microbial short-chain fatty acids: a bridge between dietary fibers and poultry gut health — A review

Ali Qasim,Ma Sen,La Shaokai,Guo Zhiguo,Liu Boshuai,Gao Zimin,Farooq Umar,Wang Zhichang,Zhu Xiaoyan,Cui Yalei,Li Defeng,Shi Yinghua 아세아·태평양축산학회 2022 Animal Bioscience Vol.35 No.10

The maintenance of poultry gut health is complex depending on the intricate balance among diet, the commensal microbiota, and the mucosa, including the gut epithelium and the superimposing mucus layer. Changes in microflora composition and abundance can confer beneficial or detrimental effects on fowl. Antibiotics have devastating impacts on altering the landscape of gut microbiota, which further leads to antibiotic resistance or spread the pathogenic populations. By eliciting the landscape of gut microbiota, strategies should be made to break down the regulatory signals of pathogenic bacteria. The optional strategy of conferring dietary fibers (DFs) can be used to counterbalance the gut microbiota. DFs are the non-starch carbohydrates indigestible by host endogenous enzymes but can be fermented by symbiotic microbiota to produce shortchain fatty acids (SCFAs). This is one of the primary modes through which the gut microbiota interacts and communicate with the host. The majority of SCFAs are produced in the large intestine (particularly in the caecum), where they are taken up by the enterocytes or transported through portal vein circulation into the bloodstream. Recent shreds of evidence have elucidated that SCFAs affect the gut and modulate the tissues and organs either by activating G-protein-coupled receptors or affecting epigenetic modifications in the genome through inducing histone acetylase activities and inhibiting histone deacetylases. Thus, in this way, SCFAs vastly influence poultry health by promoting energy regulation, mucosal integrity, immune homeostasis, and immune maturation. In this review article, we will focus on DFs, which directly interact with gut microbes and lead to the production of SCFAs. Further, we will discuss the current molecular mechanisms of how SCFAs are generated, transported, and modulated the pro-and anti-inflammatory immune responses against pathogens and host physiology and gut health. The maintenance of poultry gut health is complex depending on the intricate balance among diet, the commensal microbiota, and the mucosa, including the gut epithelium and the superimposing mucus layer. Changes in microflora composition and abundance can confer beneficial or detrimental effects on fowl. Antibiotics have devastating impacts on altering the landscape of gut microbiota, which further leads to antibiotic resistance or spread the pathogenic populations. By eliciting the landscape of gut microbiota, strategies should be made to break down the regulatory signals of pathogenic bacteria. The optional strategy of conferring dietary fibers (DFs) can be used to counterbalance the gut microbiota. DFs are the non-starch carbohydrates indigestible by host endogenous enzymes but can be fermented by symbiotic microbiota to produce shortchain fatty acids (SCFAs). This is one of the primary modes through which the gut microbiota interacts and communicate with the host. The majority of SCFAs are produced in the large intestine (particularly in the caecum), where they are taken up by the enterocytes or transported through portal vein circulation into the bloodstream. Recent shreds of evidence have elucidated that SCFAs affect the gut and modulate the tissues and organs either by activating G-protein-coupled receptors or affecting epigenetic modifications in the genome through inducing histone acetylase activities and inhibiting histone deacetylases. Thus, in this way, SCFAs vastly influence poultry health by promoting energy regulation, mucosal integrity, immune homeostasis, and immune maturation. In this review article, we will focus on DFs, which directly interact with gut microbes and lead to the production of SCFAs. Further, we will discuss the current molecular mechanisms of how SCFAs are generated, transported, and modulated the pro-and anti-inflammatory immune responses against pathogens and host physiology and gut health.