Legal Issues Arising out of Delay in Civil Aviation

Zhao, Yun Korea Society of Air Space Law and Policy 2003 한국항공우주정책·법학회지 Vol.18 No.-

Bioinspired Superhydrophobic Carbonaceous Hairy Microstructures with Strong Water Adhesion and High Gas Retaining Capability

Zhao, Yun,Qin, Minglei,Wang, Anjie,Kim, Dongpyo WILEY‐VCH Verlag 2013 ADVANCED MATERIALS Vol.25 No.33

<P><B>Various hydrophobic hairy carbonaceous fibers</B> are obtained by a low‐temperature CVD process on catalyst‐patterned surface patches which are selectively coated with silica to make the surface superhydrophobic and yet allow strong water adhesion for the “Salvinia effect”. The versatility of the functional hairy fiber surfaces is demonstrated with a liquid barrier grid for cell microarray, a gas retaining capability under water/liquid for a membrane‐free microfluidic chemical process, and functionalized papillae for cell immobilization with green algae.</P>

Fabrication of porous Si3N4 ceramics with controlled porosity by milling of fibrous α-Si3N4 powder Influence of zircon on cristobalite crystallization of

Zhaoyun Xu,Yaming Zhang,Bo Wang,Jian-feng Yang,Kaikai Liu 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.8

Porous Si3N4 ceramics with varied porosities were prepared by liquid phase sintering of fibrous α-Si3N4 powder with differentmorphology after ball milling. The influence of the ball milling time on porosity, shrinkage, microstructure and mechanicalproperties of Si3N4 ceramics were investigated. With increasing of the ball milling time from 0 h to 24 hrs, the mean length andaspect ratio of the fibrous α-Si3N4 particles decreased dramatically, resulting in the porosity of porous Si3N4 ceramics decreasedfrom 55.6% to 19.3%. With the decreased length of the fibrous α-Si3N4 particles, microstructures with decreased aspect ratioof β-Si3N4 grains were formed, as a result of increased nuclei number and limited grain growth of the β-Si3N4 grains. Theflexural strength varied from 62 MPa to 205 MPa could be obtained attributed to the synergy effect of porosity andmicrostructure.

Efficient Parallel TLD on CPU-GPU Platform for Real-Time Tracking

( Zhaoyun Chen ),( Dafei Huang ),( Lei Luo ),( Mei Wen ),( Chunyuan Zhang ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.1

Trackers, especially long-term (LT) trackers, now have a more complex structure and more intensive computation for nowadays’ endless pursuit of high accuracy and robustness. However, computing efficiency of LT trackers cannot meet the real-time requirement in various real application scenarios. Considering heterogeneous CPU-GPU platforms have been more popular than ever, it is a challenge to exploit the computing capacity of heterogeneous platform to improve the efficiency of LT trackers for real-time requirement. This paper focuses on TLD, which is the first LT tracking framework, and proposes an efficient parallel implementation based on OpenCL. In this paper, we firstly make an analysis of the TLD tracker and then optimize the computing intensive kernels, including Fern Feature Extraction, Fern Classification, NCC Calculation, Overlaps Calculation, Positive and Negative Samples Extraction. Experimental results demonstrate that our efficient parallel TLD tracker outperforms the original TLD, achieving the 3.92 speedup on CPU and GPU. Moreover, the parallel TLD tracker can run 52.9 frames per second and meet the real-time requirement.

Inhibiting Cytochrome C Oxidase Leads to Alleviated Ischemia Reperfusion Injury

Zhaoyun Yang,Zhongxin Duan,Tian Yu,Junmei Xu,Lei Liu 대한심장학회 2017 Korean Circulation Journal Vol.47 No.2

Background and Objectives: The overall purpose of this study was to investigate the role of cytochrome C oxidase (CcO) in preventing ischemia reperfusion-induced cardiac injury through gaseous signaling molecule pathways. Materials and Methods: We used CcO inhibitor, potassium cyanide (KCN) to mimic the pre-treatment of gaseous signaling molecules in a global ischemia/reperfusion (IR) injury model in rats. Intracellular reactive oxygen species (ROS) was determined by measuring mitochondrial H2O2 and mitochondrial complex activity. Results: KCN pre-treatment led to decreased infarction area after IR injury and improved cardiac function. KCN pre-treated group challenged with IR injury was associated with reduced ROS production through inhibition of activity and not downregulation of CcO expression. In addition, KCN pre-treatment was associated with enhanced expression and activity of mitochondrial antioxidase, suggesting the role of CcO in regulating IR injury through oxidative stress. Conclusion: KCN pre-treatment reduced the severity of IR injury. The potential mechanism could be increased endogenous anti-oxidase activity and consequently, the enhanced clearance of ROS.

Study of physical simulation of electrochemical modification of clayey rock

Chai, Zhaoyun,Zhang, Yatiao,Scheuermann, Alexander Techno-Press 2016 Geomechanics & engineering Vol.11 No.2

Clayey rock has large clay mineral content. When in contact with water, this expands considerably and may present a significant hazard to the stability of the rock in geotechnical engineering applications. This is particularly important in the present work, which focused on mitigating some unwelcomed properties of clayey rock. Changes in its physical properties were simulated by subjecting the rock to a low voltage direct current (DC) using copper, steel and aluminum electrodes. The modified mechanism of the coupled electrical and chemical fields acting on the clayey rock was analyzed. It was concluded that the essence of clayey rock electrochemical modification is the electrokinetic effect of the DC field, together with the coupled hydraulic and electrical potential gradients in fine-grained clayey rock, including ion migration, electrophoresis and electro-osmosis. The aluminum cathodes were corroded and generated gibbsite at the anode; the steel and copper cathodes showed no obvious change. The electrical resistivity and uniaxial compressive strength (UCS) of the modified specimens from the anode, intermediate and cathode zones tended to decrease. Samples taken from these zones showed a positive correlation between electric resistivity and UCS.

Comparison of the flight ability of diapausing and post-diapause Osmia excavata Alfken (Hymenoptera: Megachilidae) at different temperatures

Lyu Zhaoyun,Liu Haigang,Zhou Ting,Feng Min,Lu Zengbin,Nie Lei,Wang Guiping,Wang Guangzhao,Li Lili,Men Xingyuan,Sun Meng,Yu Yi 한국응용곤충학회 2024 Journal of Asia-Pacific Entomology Vol.27 No.1

The solitary mason bee Osmia excavata Alfken (Hymenoptera: Megachilidae) is an important pollinator of fruit trees in northern China. This stduy compared and studied the flight ability of O. excavata at different temper atures both during and post diapause, with the aim of exploring the feasibility of using O. excavata prematurely released from diapause for pollination. The flight capacity of male and female O. excavata during diapause and post diapause was measured at 3 ◦ C intervals from 10 to 31 ◦ C by using a computer-monitored flight-mill system. The results showed that as the temperature increased, the flight ability also increased until an optimal tem perature was reached, whereupon it gradually decreased regardless of the further increase in temperature. Temperature had a highly significant impact on flight ability (P < 0.01), whereas gender only had a significant effect on average flight distance (P = 0.034). Diapause status had significant effects on average flight distance, average flight speed and maximum flight speed, and the interaction between diapause and temperature had a highly significant impact on average flight distance and average flight speed (P < 0.01). Post diapause, the flying ability of bees was significantly improved; however, diapausing O. excavata demonstrated a sufficient flying ability and so could be used as auxiliary pollinators for fruits in greenhouses during winter and early spring, when there is a shortage of pollinators.

A STUDY OF TEACHER QUESTIONING BEHAVIOUR AND STUDENTS’ LANGUAGE PRODUCTION IN CHINESE EFL CLASSROOM CONTEXTS

GUO Zhaoyun,YINJianan 부산외국어대학교 외국어연구소 2020 외국어연구 Vol.33 No.-

The study was a detailed inquiry into the teaching and learning of English as a foreign language (EFL) at selected middle schools in China. It was mainly a classroom-centered research by employing a data-driven, qualitative research complemented by supplementary quantitative analysis. The study examined whether teacher questioning strategies in the classroom enhanced or obstructed EFL learning. A data set of 12 lessons of six teachers and their students were collected at three different public schools in China. Audio-visual recordings was the data collecting tool. The study focused on the teacher talk (TT) with special emphasis on teacher questioning behaviour in the EFL classroom. The study’s aim was to provide evidence of varied TT strategies occurring in the classroom in order to determine the influence of these strategies on EFL learning. The results revealed that teacher-directed questioning formed the major element of the teaching act. The length and syntactic complexity of student production were influenced by the teacher questioning behaviour. Teacher questioning was dominated by posing lower level questions and a majority of these questions were performed as curriculum/linguistic related, which constrained learner involvement in regards to higher-level thinking response as well as constrained to elicit more complex language production. In general, varying patterns of TT generated differing outcomes for the learners. If teachers limited their type of talk, language learning would be compromised. The study gives not only insights into theories of language education but also provides implications for future decisions regarding effectiveness and constructiveness of classroom pedagogy for ELT practices in foreign language classrooms. Key words: EFL; Teacher questioning; Language production

Effects of organic silicone additive material on physical and mechanical properties of mudstone

Chai, Zhaoyun,Kang, Tianhe,Chen, Weiyi Techno-Press 2014 Geomechanics & engineering Vol.6 No.2

Mudstone is a very common rock that, when in contact with water, can exhibit considerable volume change and breakdown. This behavior of mudstone is frequently encountered in geotechnical engineering and has a considerable influence on infrastructure stability. This is particularly important in the present work, which focuses on mitigating the harmful properties of mudstone. The samples studied are of Permian Age mudstone from Shandong Province, China. Modification tests using organic silicone additive material were carried out. The mechanisms of physical properties modification of mudstone were comparatively studied using corresponding test methods, and the modification mechanism of organic silicone additive material acting on mudstone was analyzed. The following conclusions were drawn. The surface texture and characters of mudstone changed dramatically, surface character turns from hydrophilic to hydrophobic after organic silicone additive material modification. The changes in the surface character indicate a reduction in the water sensitivity of mudstone. After modification, the shape of porosity and fracture of mudstone changed unremarkable, and the total and free expansion ratios decreased obviously, whereas the strength increased markedly.

Precision Therapy in Acromegaly: How Close Is It to Reality?

구철룡,Vladimir Melnikov,Zhaoyun Zhang,이은직 대한내분비학회 2020 Endocrinology and metabolism Vol.35 No.2

Acromegaly presents with an enigmatic range of symptoms and comorbidities caused by chronic and progressive growth hormoneelevations, commonly due to endocrinologic hypersecretion from a pituitary gland tumor. Comprehensive national acromegaly databases have been appearing over the years, allowing for international comparisons of data, although still presenting varying prevalence and incidence rates. Lack of large-scale analysis in geographical and ethnic differences in clinical presentation and management requires further research. Assessment of current and novel predictors of responsiveness to distinct therapy can lead to multilevel categorization of patients, allowing integration into new clinical guidelines and reduction of increased morbidity and mortality associated with acromegaly. This review compares current data from epidemiological studies and assesses the present-day applicationof prognostic factors in medical practice, the reality of precision therapy, as well as its future prospects in acromegaly, with a specialfocus on its relevance to the South Korean population.