경수철도가 내몽골 거점도시의 도시공간질서 변화과정에 미친 영향 - 중국 내몽골 서부지역 거점도시인 후허하오터과 바오터우시를 중심으로 -

조가기(Zhao, Jiaqi),이경찬(Lee, Kyung-Chan) 대한건축학회 2022 대한건축학회논문집 Vol.38 No.11

Regarding the hub cities of Hohhot and Baotou in western Inner Mongolia, this paper analyzes the role of the Beijing-Suiyang Railway in the process of modern urbanization and urban spatial structure transformation. Based on the characteristics of the railway route and railway station location, this study particularly focuses on the analysis of the skeletal elements of urban structure such as road system, functional area structure, urbanization area and urban growth axis. The Beijing-Suiyang railway provides new development impetus for the area surrounding the station and serves as an opportunity for the transformation of premodern urban spatial order. A new urban functional area dominated by factories and circulating business is formed around the railway station, which motivate development of urban fringe belts. The major road system formed with the railway station has become the framework of the spatial structure in the subsequent urban development process. However, the railway plays different impacts on the reorganization process of the modern urban spatial order of Hohhot and Baotou. In Hohhot where the railway station is located between two major urbanized areas, Guihua and Suiyuan, the development of the fringe-belt around the railway station and the outward expansion of the existing urban area were carried out. And in this process, the axis of urban growth was changed. In Baotou where the railway station is located south of the city wall, after the construction of the railway, the development power was dispersed to the inner wall area and the area around the adjacent Deunggu railway station. And the function of the existing urban axis was strengthened with infilling development inside the wall rather than the expansion-type development. This difference can be attributed to the comprehensive effect of factors such as the location of the railway station, the urban characteristic and spatial structure around the railway construction, and the development agents of surrounding areas of the railway station.

Bioelectrochemical performance of microbial fuel cell powered electro-Fenton system (MFCⓅEFs) with composite PANI-Mn/CF anode

Jiaqi Lv,Weiye Wang,Qingliang Zhao,Kun Wang 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.4

Microbial fuel cell powered electro-Fenton system (MFCⓅEFs) is a self-sustainable energy conversion process to degrade refractory pollutants utilizing green biomass energy. Most previous works usually employed innovative cathode to minimize electron transfer losses but neglected the development of high-efficiency anode to enhance electron generation. The synergy of polyaniline (PANI) and MnO2 on electrode could improve charge accessibility and facilitate rapid electron transfer due to its superior conductivity and capacitance, which had not been applied to MFCⓅEFs as anode so far. In this study, a PANI-Mn/CF (carbon fiber loaded with polyaniline and MnO2) composite anode was introduced into MFCⓅEFs to enhance interface activity and realize more efficient electricity generation and pollutant degradation. Experimental results showed that a higher power density (5.49 times that of the original CF) and lower ohmic resistance (7.17 Ω) occurred in the MFCⓅEFs with PANI-Mn/CF anode, which consumed more sewage sludge (37.14% of TCOD removal), leading to achieving more effective pollutant degradation (93.03% of tetracycline hydrochloride removal). Overall, this study provided an innovative way of thinking and approach to efficient utilization of biomass waste and degradation of refractory pollutants with the merits of environmental sustainability.

Study on electromechanical performance of steering of the electric articulated tracked vehicles

Jiaqi Wu,Guoqiang Wang,Huanyu Zhao,Kangkang Sun 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.7

Articulated tracked vehicles (ATVs) usually use hydraulic drive or mechanical drive modes. Electrically driven tracked vehicles have become a promising development direction for saving energy and meeting the environment requirements. In this study, based on the mechanical motion equation and the dynamic ATV equation, the electromechanical coupling model of the track vehicles is established by coupling the motor equation. The typical mechanical and electrical parameters in the ATV steering process are measured and compared with the numerical results to verify the correctness of the electromechanical coupling model. Experimental results indicate the main mechanical and electrical parameters of the ATV electro-mechanical system are changed at different articulated point deflection angles. The characteristic parameters of ATV include the change in current and voltage, the size of trajectory radius and the change of power under different deflection angles (10°, 15°, 20°, 25° and 30°), all of which are of great significance for the control of ATV. The current and voltage signals of ATV under specific trajectory can be calculated in reverse by the model, thereby providing a theoretical basis for the trajectory control of articulated vehicles. Therefore, this study provides a reference for the theoretical analysis of electromechanical performance, road driving performance and vehicle design of the electric ATV.

An energy-efficient hierarchical algorithm of dynamic obstacle avoidance for unmanned surface vehicle

Wang Jiaqi,Li Shixin,Li Boyang,Zhao Chenyu,Cui Ying 대한조선학회 2023 International Journal of Naval Architecture and Oc Vol.15 No.-

Most of the existing studies developed and improved local path planning algorithms independently of global planning, i.e., ignoring the global optimal constrains. To meet the requirements of practical applications, this paper presented an energy-efficient hierarchical collision avoidance algorithm for unmanned surface vehicle operating in clustered dynamic environments. For the global level, genetic algorithm was modified by strategies of greedy-inspired population initialization, penalty-based multiobjective fitness function, and joint crossover. For the local level, velocity obstacle was combined with dynamic window approach to provide the kinematic constraints of the vehicle to its admissible velocities and simplified collision avoidance rules to guide the evasive maneuvers. Simulations showed that the proposed global algorithm was superior to three other algorithms in terms of path length, path smoothness, and convergence speed regardless of the environment size. The performance of the local algorithm was also verified for various encounter scenarios and speed ratios. In addition, the combination of the global and local planning can effectively solve the path optimization and dynamic obstacle avoidance in a designed offshore environment of fish cage culture.

Responses of GS-NS0 Myeloma Cells to Osmolality: Cell Growth, Intracellular Mass Metabolism, Energy Metabolism, and Antibody Production

Liang Zhao,Li Fan,Jiaqi Wang,Hongxing Niu,Wen-Song Tan 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.5

The influence of osmolality on growth, metabolism, and antibody production of mammalian cells has been widely reported in the past. However, more information about the responses of GS-NS0 Myeloma cells to osmolality, especially regarding the intracellular mass and energy metabolism, has not been available in detail. Fed-batch cultures started at different osmolalities in the range of 280~370 mOsm/kg were designed to investigate the effects. As the osmolality and cell status changed during the process, cell performance was evaluated in the comparable periods with similar growth rates, nutrition concentrations, and relatively consistent environments. Metabolic flux analysis indicated most of extra consumed glucose at higher osmolalities flowed into lactate formation pathway. The proportion of glucose flux flowed into glycolysis pathway remained approximately 90% and the need of glucose for biomass synthesis was constantly. Also, more than 88% of the glutamine was used in biomass synthesis and the absolute flux remained constant. The specific consumption rate of glutamine declined significantly when cells were cultured in hypo-osmolality (276 mOsm/kg) and a portion of glutamine was synthesized from glutamate. Furthermore, cells were in the state of high energy production at osmolality of 276 mOsm/kg. More glucose flowed into TCA circle with the high efficiency of energy production to meet the demand. Thus, the IVC, the specific antibody production rate, and maximal antibody concentration in fed-batch culture started at 280 mOsm/kg decreased by 35, 36, and 48% compared to those in the culture started at 330 mOsm/kg The influence of osmolality on growth, metabolism, and antibody production of mammalian cells has been widely reported in the past. However, more information about the responses of GS-NS0 Myeloma cells to osmolality, especially regarding the intracellular mass and energy metabolism, has not been available in detail. Fed-batch cultures started at different osmolalities in the range of 280~370 mOsm/kg were designed to investigate the effects. As the osmolality and cell status changed during the process, cell performance was evaluated in the comparable periods with similar growth rates, nutrition concentrations, and relatively consistent environments. Metabolic flux analysis indicated most of extra consumed glucose at higher osmolalities flowed into lactate formation pathway. The proportion of glucose flux flowed into glycolysis pathway remained approximately 90% and the need of glucose for biomass synthesis was constantly. Also, more than 88% of the glutamine was used in biomass synthesis and the absolute flux remained constant. The specific consumption rate of glutamine declined significantly when cells were cultured in hypo-osmolality (276 mOsm/kg) and a portion of glutamine was synthesized from glutamate. Furthermore, cells were in the state of high energy production at osmolality of 276 mOsm/kg. More glucose flowed into TCA circle with the high efficiency of energy production to meet the demand. Thus, the IVC, the specific antibody production rate, and maximal antibody concentration in fed-batch culture started at 280 mOsm/kg decreased by 35, 36, and 48% compared to those in the culture started at 330 mOsm/kg

An Improved Density-Based Design Method of Additive Manufacturing Fabricated Inhomogeneous Cellular-Solid Structures

Yu Zhu,Jiaqi Zhao,Ming Zhang,Xin Li,Leijie Wang,Chuxiong Hu 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.1

Benefited from the rapid development of additive manufacturing (AM), inhomogeneous cellular structures have attracted many interests for their superior structural and functional performance. Recently proposed density-based design methods have been shown to provide great computational efficiency and obtain structures with excellent performance. To achieve better structural performance while considering AM constraints, an improved density-based design method which introduces solid and void units into the design domain is proposed in this paper. First, based on homogenization theory and solid-body analysis, unit parameters of different preset unit relative densities are determined. And a unit effective property interpolation model is constructed. Then, the macro relative density layout is optimized with density methods. In the optimization process, an efficient density filter is proposed to increase the optimization domain and satisfy minimal feature size constraint. Finally, the structure reconstruction algorithm automatically constructs the optimized cellular structure based on the unit and density information obtained in the first two processes. Numerical examples show that the proposed method efficiently obtains inhomogeneous cellular structures with better performance, compared with existing density-based methods.

Inhibition of VRK1 suppresses proliferation and migration of vascular smooth muscle cells and intima hyperplasia after injury via mTORC1/β-catenin axis

( Xiongshan Sun ),( Weiwei Zhao ),( Qiang Wang ),( Jiaqi Zhao ),( Dachun Yang ),( Yongjian Yang ) 생화학분자생물학회 2022 BMB Reports Vol.55 No.5

Characterized by abnormal proliferation and migration of vascular smooth muscle cells (VSMCs), neointima hyperplasia is a hallmark of vascular restenosis after percutaneous vascular interventions. Vaccinia-related kinase 1 (VRK1) is a stress adaption-associated ser/thr protein kinase that can induce the proliferation of various types of cells. However, the role of VRK1 in the proliferation and migration of VSMCs and neointima hyperplasia after vascular injury remains unknown. We observed increased expression of VRK1 in VSMCs subjected to platelet-derived growth factor (PDGF)-BB by western blotting. Silencing VRK1 by shVrk1 reduced the number of Ki-67-positive VSMCs and attenuated the migration of VSMCs. Mechanistically, we found that relative expression levels of β-catenin and effectors of mTOR complex 1 (mTORC1) such as phospho (p)-mammalian target of rapamycin (mTOR), p-S6, and p-4EBP1 were decreased after silencing VRK1. Restoration of β-catenin expression by SKL2001 and re-activation of mTORC1 by Tuberous sclerosis 1 siRNA (siTsc1) both abolished shVrk1-mediated inhibitory effect on VSMC proliferation and migration. siTsc1 also rescued the reduced expression of β-catenin caused by VRK1 inhibition. Furthermore, mTORC1 re-activation failed to recover the attenuated proliferation and migration of VSMC resulting from shVrk1 after silencing β-catenin. We also found that the vascular expression of VRK1 was increased after injury. VRK1 inactivation in vivo inhibited vascular injury-induced neointima hyperplasia in a β-catenin-dependent manner. These results demonstrate that inhibition of VRK1 can suppress the proliferation and migration of VSMC and neointima hyperplasia after vascular injury via mTORC1/β-catenin pathway. [BMB Reports 2022; 55(5): 244-249]

Numerical Simulations of Pull-In Voltage in Wave-Bar NEMS Switches for Nonvolatile Memory Application

Yuan Liu,WenFeng Xiang,JiaQi Zhang,MingHao Hu,Kun Zhao,ShouXian Zhong 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.8

Laser-induced Magnetization Dynamics for L10-FePt Thin Films with Perpendicular Anisotropy

Zongzhi Zhang,Boyin Cui,Jiaqi Zhao,B. Ma,Q. Y. Jin 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.4

Laser-induced de- and re-magnetization dynamics in perpendicularly magnetized L10-FePt films are studied by using a time-resolved magneto-optical pump-probe technique. The observed ultrafast magnetic dynamic behaviors depend on the film thickness and substrate temperature. The thinner FePt film has a relatively larger maximum demagnetization percentage and a slower relaxation rate because of fewer free electrons being in the laser spot area. However, for the same thickness samples, although they have the same maximum demagnetization, their magnetization recovery speed is different. The sample deposited at high Ts exhibits a faster recovery due to the relatively large FePt grains with high magneto-crystalline anisotropy energy. In addition, we find that all the FePt samples reach the maximum demagnetization at an almost same characteristic delay time of 0.9 picoseconds, irrespective of the laser intensity, film thickness, and substrate temperature.

금단남종(金丹南宗)의 신유학(新儒學) 흡수와 통합 - 장백단(張伯端)과 백옥섬(白玉蟾)을 중심으로

리위융 ( Li Yuyong ),자오자치 ( Zhao Jiaqi ) 중국사학회 2021 中國史硏究 Vol.- No.130

宋代 新儒學의 발흥은 중국 전통 사상 및 문화의 기본적인 발전 방향, 즉 新儒學이 주도하는 가운데 佛敎와 道敎가 양 날개로 작용하는 문화 발전 구조를 확립시켰다. 이러한 구조는 佛敎와 道敎가 서로 경쟁하면서 新儒學이 스스로에게 끼치는 영향에 대해 각별한 관심을 기울이도록 강제하였다. 그런 점에서 金丹 南宗의 주요 인물인 張伯端, 白玉蟾 등은 자신들의 새로운 도교 이론 체계를 구축하고 정비하면서 전통 유학과 신유학을 흡수·통합하는데 각별한 관심을 기울였다. 그들은 시대정신을 예리하게 파악하여, 儒·佛·道 삼교의 융통(融通)을 강력하게 주창하였다. 또한 新儒學을 道敎에 수용하여 “性命雙修”의 핵심적인 차원에 心性論을 원용하고 이를 세밀하게 규명함으로써, 心性論을 바탕으로 金丹 사상을 완연히 일신하였다. 이를 통해 道敎 內丹 수련의 경지와 兩宋시기 道敎 철학의 이론적 질을 크게 높였다. The Rise of Neo-Confucianism in the Song Dynasty, basically laid down the direction of the development of traditional Chinese thought and culture after the Song Dynasty, A cultural development pattern with Neo-Confucianism as the main guide with Buddhism and Taoism as the two wings. The objective reality of this pattern forced the two Buddhists and Taoists to pay extra attention to the influence of Neo-Confucianism on themselves while competing with each other. In this respect, the main representatives of the Southern Sect of Jindan, such as Zhang Boduan and Bai Yuchan, paid special attention to absorbing and integrating traditional Confucianism and Neo-Confucianism when constructing and perfecting their own theoretical system of New Taoism. They keenly grasped the spirit of the times, vigorously advocated the integration of Confucianism, Buddhism and Taoism, and helped the new Confucianism to enter Taoism, putting the theory of mindfulness at the core level of "dual cultivation of life" and elaborating it in detail, making the Jindan thought constructed on the basis of the theory of mindfulness new, greatly enhancing the realm of Taoist Nei Dan cultivation and the theoretical quality of Taoist philosophy in the two Song dynasties.