STUDY ON HYDRODYNAMIC PRESSURE OF CYLINDER PILE-CAP PIER IN DEEP W ATER SUBJECTED TO SEISMIC ACTION

Song Bo 한국재난정보학회 2010 한국재난정보학회 학술대회 Vol.2010 No.1

Molecular Level Study of Graphene Networks Functionalized with Phenylenediamine Monomers for Supercapacitor Electrodes

Song, Bo,Choi, Ji Il,Zhu, Yuntong,Geng, Zhishuai,Zhang, Le,Lin, Ziyin,Tuan, Chia-chi,Moon, Kyoung-sik,Wong, Ching-ping American Chemical Society 2016 Chemistry of materials Vol.28 No.24

<P>Three phenylenediamine (PD) monomers, o-phenylenediamine (OPD), m-phenylenediamine (MPD), and p-phenylenediamine (PPD), were used to prepare the functionalized graphene (PD/rGO) networks. The results obtained from a series of chemical, thermal, and rheological analyses elucidated the mechanism of the covalent bonding and the existence of cross-linked graphene networks. The measured XRD patterns and molecular dynamic calculations discovered that those PPD and MPD molecules could enlarge graphene interlayer spacing to 1.41 and 1.30 nm, respectively, while OPD molecules were disorderly bonded or nonbonded to the basal planes of graphene layers, resulting in small and variable inter layer distances. The loadings of PD monomers were optimized to achieve superior supercapacitor performance. Electrochemical study showed that PPD/rGO exhibited the largest specific capacitance of 422 F/g with excellent cycling stability and low charge transfer resistance. The large variations in the capacitance values among PD/rGO networks with different PD monomers were explained by the difference in the graphene nanostructures, reversible redox transitions, and charge transfer characteristics. Particularly, density function theory calculations were adopted to compare electronic properties of the PD/rGO composites, including formation energy, electron density distribution, HOMO energy levels, and electron density of states near the Fermi level.</P>

Meta-analysis of the MDM2 T309G Polymorphism and Gastric Cancer Risk

Song, Bo,Duan, Zhong-Yu,Zhong, Yun-Hua,Lei, Na,Yang, Yu-Qing,Luo, Kai-Yuan Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.11

Background: Mdm2 binds to the amino-terminus of p53 to induce its degradation and a single nucleotide polymorphism in the MDM2 promoter region (T309G) has been reported to increase the risk of several carcinomas, such as gastric cancer. However, the results of published studies to analyze the association between MDM2 T309G and gastric cancer havve often conflicted. Methods: To better illustrate the filiation between MDM2 T309G and gastric cancer, we performed a meta-analysis. Odds ratios (ORs) and 95% confidence intervals (CIs) were used to evaluate the strength of the relationship. The pooled ORs were performed for 4 models, additive, recessive, co-dominant model, and dominant. Results: Nine published case-control studies including 3,225 gastric cancer cases and 4,118 controls were identified. The MDM2 T309G polymorphism was associated with a significantly increased risk of gastric cancer risk when all studies were pooled into the meta-analysis (GG versus TT, OR=1.57; 95%CI=1.57-2.12; p=0.003) and GG versus GT/TT, OR=1.52; 95%CI=1.217-1.90; p<0.001). Furthermore, Egger's test did not show any evidence of publication bias (P = 0.608 for GG versus TT). Conclusion: Our results suggest that the MDM2 T309G polymorphism is indeed associated with a significantly increased risk of gastric cancer.

Study on Characteristics of Displacement and Stress of Piers under Adjacent load

song bo,김태환,wang yanxuc,zang jingxing 한국재난정보학회 2016 한국재난정보학회 논문집 Vol.12 No.1

Nowdays, adjacent loading bringing enormous harm to the existing bridge in engineering construction. In this paper, the influencing mechanism of adjacent loading to pier and Law of displacement of pier is researched through living examples, and the safe influence area has been defined. Research shows that: the main damages to piers is caused by the side loading; lateral displacement index of pier top surface is more conservative than the pier additional stress index; it is secure when the distance of adjacent load is 0.5 times of the height of accumulation or 6m, otherwise it would be very scary, and the monitoring measure is necessary. Nowdays, adjacent loading bringing enormous harm to the existing bridge in engineering construction. In this paper, the influencing mechanism of adjacent loading to pier and Law of displacement of pier is researched through living examples, and the safe influence area has been defined. Research shows that: the main damages to piers is caused by the side loading; lateral displacement index of pier top surface is more conservative than the pier additional stress index; it is secure when the distance of adjacent load is 0.5 times of the height of accumulation or 6m, otherwise it would be very scary, and the monitoring measure is necessary

filtering for stochastic systems driven by Poisson processes

Song, Bo,Wu, Zheng-Guang,Park, Ju H.,Shi, Guodong,Zhang, Ya Taylor and Francis 2015 International Journal of Control Vol. No.

VEHICLE MODELING WITH THE EXHAUST SYSTEM AND EXPERIMENTAL VALIDATION TO INVESTIGATE THE EXHAUST VERTICAL VIBRATION CHARACTERISTICS EXCITED BY ROAD SURFACE INPUTS

Songbo Li,Xiqiang Guan,Jianwu Zhang 한국자동차공학회 2008 International journal of automotive technology Vol.9 No.4

An 8 degree-of-freedom (DOF) vehicle model is established to investigate the vertical vibration characteristics of an exhaust system excited by road surface inputs. The simplification of an exhaust system relevant to the vehicle model is discussed in detail, including the steps of exhaust modal analysis, definition of mass element, exhaust partitioning, parameter acquisition, and simplified exhaust validation. The vehicle model is developed based on a half-vehicle model, simulated using MATLAB/SIMULINK, and validated by comparing the simulation and experiment on various road profiles. Results show that the vehicle model effectively represents the dynamics of the vehicle characteristic in vertical vibration.

Daoism`s Body-thinking and Sports Ideology of Inner-transcendence

( Songbo He ) 한국체육학회 2016 국제스포츠과학 학술대회 Vol.2016 No.1

Purpose: As the representatives of Daoism, Lao Zi, Zhuang Zi, Lie Zi, etc. have the same opinions on the mind-body monism with Confucianism, but their body-thinking is quite unique. The article researches the sports ideology from the aspect of the bodies, to discuss mainly Daoist’s body structure, body function and body disposal, excavate the body-thinking and the inner-transcendence of its sports ideology, refresh the traditional sports culture, develop the value influence of eastern sports culture, finally expect Daoist’s view of sports ideology can provide the possibility for modern sports to deal with the crisis regarding the response to risks. Result: During the Pre-Qin period when Daoism prevailed, not so much about sports were talked by Lao Zi and Zhuang Zi while Daoist’s view is always related to the body activities and it is obsessed with ”Whisht and Active; With and Without; hard and soft; virtual and real” as opposite and complementary ideology and inspect the lives and creatures from Daoist’s view. In bare several sports records, Zhuang Zi mostly chose to let Daoist’s ideology transcend body activities directly. 1. Daoist’s view of body-thinking (1) Perception of body structure Compared with the perception of body structure in view of Confucianist, Daoist’s perception appears to have more guidance meanings to anatomy. Through the self-review from Qi Wu Discussion Zhuang Zi, in the question towards “hundreds of skeleton, nine orifices, six organs, who should I be close to?”, it shows that people consists of hundreds of skeletons, nine orifices (eye, ear, nose, mouth, uretha, anus) and six main internal organs inside the body(heart, liver, spleen, lung, kidney, Mingmen). The body construction manifested by Daoist is more specific than what is manifested by Confucianist, while from the body functions corresponded from the body construction, like heart to mouth(talk), live to eye(see), kidney to foot(walk) and etc., its coincidence with the perception of body structure from medical science in Chinese ancient times can be seen. (2) Perception of Body Function Lao Zi praised body to be a unprecedented level and the body function is greatly influenced especially the body in dynamic development. Lao Zi proposed that people’s body function is the most optimized stage at babyhood period and he regarded newborn boy as the model ideal body. The body function of Lao Zi is thoroughly handed down and developed at Zhuang Zi. Similarly to Lao Zi, Zhuang Zi also believed babyhood as a optimistic stage for body development. What is the more valuable is that Zhuang Zi, to some degree he is nihilistic , is not abandoning either of body or Qi. He believes that an intact life is surely an organic whole of both body and mental function. (3) Body disposal In the long period of life journey, the emphasis from people to life, the changes to death and the attitudes and the maintenance to the body can be included into the scope of body disposal of Daoist. Lao Zi exceptionally emphasized the individual life. He proposed that “Which is closer or more important to you, is it fame or body? Which is more, body or goods?”,Chapter 44, Lao Zi. Zhuang Zi inherited the “Hua(change)” idea. He treats the natural process of body via the idea of “change” and also treat with “living and death” with a philosophical idea. Everyone should go through sickness and growing old. The characters depicted by Zhuang Zi are not only rejected or afraid of death, even they show a attitude of philosophical and appreciating status. 2. Inner-transcendence of Daoism The life philosophy of emphasis on female and fragile property is vividly noticed from the transition from the body function to the inner-transcendence of Daoist’s ideology, the inner-transcendence is life philosophy which stems from body when it acts on the body in the meantime. In Daoist’s view, the body is structured from the intangible power and the body function needs recover to the life itself to the greatest degree. It respects life, accustoms to the changes as well as moderate sports. In a manner of speaking, it is during the observation and reference to the comprehensiveness and experience to the body, Daoist’s body-thinking spreads to the field of sports: it abandons the show off body strength, advocate unknowing of the strength; abandon the external assessment of athletic performance, advocate comprehensive mental quality.Thus, the most initiating part of Daoist’s view of sports ideology is the relating exposition included regarding the inner-transcendence. The inner-transcendence takes the body and activity function, while it digs more deeply mentally. It is manifested into 3 forms: Firstly, it pursues the obscurity and skills of Qi; secondly, it focuses on the fascination of sports spirit; thirdly, it emphasizes the psychological factors showed in sports. Conclusion: The life philosophy showed from Daoist’s body-thinking, featured on health maintenance but exercise; inner cultivation but pursuing outside changes; hiding but dominance, guides the development of traditional sports which has a theme of health maintenance and the sports-thinking reflected by the inner-transcendence prefers to keep the mentally quite and comfortable state in the meantime, supplementing deep breathing and activities, return to life’s genuine state and provide the possibility for risk responses by modern sports. Main stream of modern sports highlights competition, utility and efficiency, and the possibility of extreme loss of humanity may happen during the pursuit of extremity of body and heart while Daoist’s view of body-thinking pursues the nature with a ideal state of constructed quite and fame-neglecting of Daoism. With the guidance of this concept, to thoroughly avoid the competitiveness and utility is a transcendence to the utility of main stream in modern sports, which makes the subject of sports is subtly free of the tense and harsh environment of sports competition. To be more deeply speaking, Daoist’s natural body-thinking gives modern sports a chance of seeking and enjoying the natural peace from the view of Daoism and help the limited creatures and lives find out the eternal reason for being cherished.

A Simplified Estimation of Stress Intensity Factor on the Hertzian Contact

Jin, Songbo,Kim, Seock-Sam Korean Tribology Society 2000 KSTLE International Journal Vol.1 No.1

A surface crack in a semi-infinite body under Hertzian contact was considered. The simplified method used to estimate stress intensity factor K for specimen was extended to the model which is chosen in this paper. Very satisfactory results are obtained comparing with those known and it is proved that the method is more convenient than other methods. The results of the analysis show that due to the presence of $K_I$ for unlubricated condition, mode I fracture is active in the field below the surface and the maximum $K_{I}$ is obtained when the trailing edge of Hertzian contact reaches a position over the crack. The magnitudes of stress intensity factors $K_I$ and $K_Il$ increase with increasing friction forces. For a surface crack perpendicular to the contact surface, the stress intensity factor $K_I$ reaches its maximum value at a depth very close to the surface. Driving forve fer crack initiation and propagation is $K_I$ for unlubricated condition and $K_Il$ for both fluid and boundary lubricated condition.n.

Estimating the Effects of Corrosion Pitting Morphology on Residual Fatigue Properties of Corroded Steel Based on Fractal Theory

Ren Songbo,Gu Ying,Gao Xinqiang,Gu Song,Kong Chao,Zeng Shenghui,Liu Peng,Li Xiaoge 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.2

In order to discuss the effect of corrosion results on fatigue properties of corroded steel, the morphology measurements and fatigue tests were performed to 10 corroded steel specimens obtained by artificial accelerated corrosion tests. And the corroded morphological characteristics and fatigue fracture of corroded specimen were studied. The results found the fracture mode and fatigue life were closely associated with the corroded morphological characteristics, especially for the fracturing source corrosion pit (FC-corrosion pit). So, based on the systematically analysis, the fatigue life prediction method of corroded steel was proposed.

Experimental Measurement and Numerical Computation of Geogrid Tension in Centrifuge Modeling

Jianfeng Chen,Songbo Yu,Jianfeng Xue,Zhenming Shi 대한토목학회 2011 KSCE JOURNAL OF CIVIL ENGINEERING Vol.15 No.8

Tension measurement of geogrid is essential in reinforcement mechanisms studies. Geogrid is a nonlinear flexible material with large apertures, it is difficult to measure the tensions mobilized in geogrid, especially in scaled-down geogrid in centrifuge modeling. In this study, strain gauges were glued onto the surface of model geogrid with epoxy resin and were calibrated through multi-stage and continuous tensile tests. Generalized Kelvin model was used to fit the constitutive curves from the tensile tests. The model is capable to describe time-dependent and nonlinear behavior of the composite material of epoxy resin and model geogrid. Based on generalized Kelvin model, tensions in the model geogrid were measured in a centrifugal modeling of a reinforced embankment on soft clay. A finite element model was developed to simulate the centrifuge modeling and a comparison was carried out between the computed and measured tensions. The numerical results basically captured the measured reinforcements, indicating that the method of reinforcement measurement proposed in this study is appropriate and reasonable.