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A new thinning-based INAR(1) process for underdispersed or overdispersed counts
Kang Yao,Wang Dehui,Yang Kai,Zhang Yulin 한국통계학회 2020 Journal of the Korean Statistical Society Vol.49 No.2
Underdispersed and overdispersed phenomena are often observed in practice. To deal with these phenomena, we introduce a new thinning-based integer-valued autoregressive process. Some probabilistic and statistical properties of the process are obtained. The asymptotic normality of the estimators of the model parameters, using conditional least squares, weighted conditional least squares and modified quasi-likelihood methods, are presented. One overdispersed real-data example and one underdispersed real-data example are given to show the flexibility and superiority of the new model.
Flexible INAR(1) models for equidispersed, underdispersed or overdispersed counts
Kang Yao,Wang Dehui,Lu Feilong,Wang Shuhui 한국통계학회 2022 Journal of the Korean Statistical Society Vol.51 No.4
Equidispersed, underdispersed and overdispersed count data are commonly encountered in practice. To better describe these data characteristics, this paper develops two classes of INAR(1) processes, which not only can model a wide range of overdispersion and underdispersion, but also have ability to describe the zero-inflated and zero-deflated characteristics of the count data. The probabilistic and statistical properties of the two processes are studied. Estimators of the model parameters are derived by using conditional maximum likelihood (CML) and modified conditional least squares (MCLS) methods. Some asymptotic properties and numerical results of the estimators are investigated. Three real examples are given to show the flexibility and usefulness of the proposed models.
Behavioral Response of Termites to Tunnel Intersection
Sook Jung Ku,Sheon-Young Kang,Nan-Yao Su,Sang-Hee Lee 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.05
Subterranean termites construct complicated tunnel network for foraging below the ground. Thus, they often encounter a number of tunnel intersections during their moving from place to place in the network. In order to understand how termites respond to the intersections, we artificially excavated two tunnels intersected with 90° degree in soil-filled arenas. The two tunnels had the width of W1 and W2 (=2, 3, and 4mm), respectively. We systematically observed the response behavior of advancing termites to the intersection with the combination of W1 and W2, (W1, W2). For (W1, W2)=(2, 2) and (3, 3), the advancing termites passed the intersection without directional changes because it was difficult for termites to bend their body to change their moving direction due to the small-sized width. For (W1, W2)=(4, 4), the termites statistically-equally chose the three directions, left, right, and straight, which was due to the fact that the intersection provided enough space for termites to bend. For (W1, W2)=(2, 3), (2, 4), and (3, 4), termites, advancing in narrower tunnels, tended considerably to turn right or left, while termites, advancing in wider tunnels, were favorably inclined to go straight. These results can be understood by considering the relationship between termite body length and tunnel width as explained for the cases of W1=W2. In addition, we briefly discussed our findings in relation to termite foraging efficiency.
Reduced Autophagy in 5-Fluorouracil Resistant Colon Cancer Cells
Yao, Cheng Wen,Kang, Kyoung Ah,Piao, Mei Jing,Ryu, Yea Seong,Fernando, Pattage Madushan Dilhara Jayatissa,Oh, Min Chang,Park, Jeong Eon,Shilnikova, Kristina,Na, Soo-Young,Jeong, Seung Uk,Boo, Sun-Jin The Korean Society of Applied Pharmacology 2017 Biomolecules & Therapeutics(구 응용약물학회지) Vol.25 No.3
We investigated the role of autophagy in SNUC5/5-FUR, 5-fluorouracil (5-FU) resistant SNUC5 colon cancer cells. SNUC5/5-FUR cells exhibited low level of autophagy, as determined by light microscopy, confocal microscopy, and flow cytometry following acridine orange staining, and the decreased level of GFP-LC3 puncta. In addition, expression of critical autophagic proteins such as Atg5, Beclin-1 and LC3-II and autophagic flux was diminished in SNUC5/5-FUR cells. Whereas production of reactive oxygen species (ROS) was significantly elevated in SNUC5/5-FUR cells, treatment with the ROS inhibitor N-acetyl cysteine further reduced the level of autophagy. Taken together, these results indicate that decreased autophagy is linked to 5-FU resistance in SNUC5 colon cancer cells.
Yao Lu,Zhe Li,Gebremariam Hailu,Derong Xu,Hairong Wu,Wanli Kang 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
The existing downhole oil–water separation (DOWS) technology has disadvantages in terms ofseparation efficiency, cost, complexity, etc. The novelfiltration separation technology using metalmeshes has been investigated and it displays the potential to increase DOWS efficiency. In current study, asuper-hydrophobic copper mesh was fabricated by a simple dip-coating method and then characterized. Focusing on the application in DOWS technology, the separation of the mesh materials in the liftingprocess of produced liquid from the wellbore was simulated and investigated by a designed indoor devicefor thefirst time. The results show that the highly hydrophobic copper mesh with water contact angle of153 can be obtained by oxidizing 40 min, followed by immersing in a 50 g L 1 stearic acid solution for25 min. The mesh can keep super-hydrophobicity and high separation stability after treatment at 100 Cor in the pH range of 5–7, while the separation efficiency is susceptible to the oil viscosity and the claycontents of the producedfluids. The super-hydrophobic copper mesh can be a promising candidate forDOWS in moderate condition. The inherent separation mechanism was further discussed by the variationof wettability and surface structure in microscopic scale.
Kang, K. A.,Piao, M. J.,Kim, K. C.,Cha, J. W.,Zheng, J.,Yao, C. W.,Chae, S.,Hyun, J. W. Springer Science + Business Media 2014 In vitro cellular & developmental biology Animal Vol.50 No.1
Hydrogen peroxide (H2O2) can induce cell damage by generating reactive oxygen species (ROS), resulting in DNA damage and cell death. The aim of this study is to elucidate the protective effects of fisetin (3,7,3',4',-tetrahydroxy flavone) against H2O2-induced cell damage. Fisetin reduced the level of superoxide anion, hydroxyl radical in cell free system, and intracellular ROS generated by H2O2. Moreover, fisetin protected against H2O2-induced membrane lipid peroxidation, cellular DNA damage, and protein carbonylation, which are the primary cellular outcomes of H2O2 treatment. Furthermore, fisetin increased the level of reduced glutathione (GSH) and expression of glutamate-cysteine ligase catalytic subunit, which is decreased by H2O2. Conversely, a GSH inhibitor abolished the cytoprotective effect of fisetin against H2O2-induced cells damage. Taken together, our results suggest that fisetin protects against H2O2-induced cell damage by inhibiting ROS generation, thereby maintaining the protective role of the cellular GSH system.
YAO YING, 유재현(Jae Hyun You),강유리(You Rie Kang),박철(Cheol Park) 한국IT서비스학회 2011 한국IT서비스학회 학술대회 논문집 Vol.2011 No.5
스마트기기의 확산으로 인해 금융업체에게 많은 변화를 일으켰다. 2009년 하반기부터 한국과 중국에서 많은 은행들이 스마트뱅킹 서비스를 출시하면서 큰 인기를 끌었다. 본 논문에서는 한국과 중국에 모바일뱅킹 발전과정을 정리하고 스마트 뱅킹의 현황 및 사례를 분석했고 사례분석과 문헌연구를 바탕으로 스마트뱅킹 지속적 수용에 영향을 주는 요인을 파악하고 개념모델을 제시했다.
Firewood Plantation as an Alternative Source of Energy in the Philippines
Yao, Calixto E.,Bae, Ki-Kang Institute of Forest Science 2008 Journal of Forest Science Vol.24 No.3
The increasing price of liquefied petroleum gas (LPG) has forced many households to shift to firewood/charcoal in the Philippines, causing tremendous pressure on the dwindling forest. This transition is more obvious in the rural area where firewood price is almost half of that in the cities. Both problems on big demand for firewood and the pressure on our forest can be partly solved by going into firewood plantation. After all, the country has vast track of idle lands, both private and government lands, waiting to be developed. What the government can do are: a) aggressive promotion of firewood plantation, b) simplify further the old technology on establishing firewood plantation to encourage more farmers, c) improve charcoal processing and d) promote the use of efficient stoves. This write up discusses the need for firewood plantation, areas available for planting, where to plant in farms, what species to plant in a particular soil type/location for optimum growth, planting methods, harvesting, marketing, and the side lights on the ecological benefits derived from plantation aside from wood.
AN ITERATIVE ALGORITHM FOR ASYMPTOTICALLY NONEXPANSIVE MAPPINGS
Yao, Yonghong,Liou, Yeong-Cheng,Kang, Shin-Min The Korean Society for Computational and Applied M 2010 Journal of applied mathematics & informatics Vol.28 No.1
An iterative algorithm was been studied which can be viewed as an extension of the previously known algorithms for asymptotically nonexpansive mappings. Subsequently, we study the convergence problem of the proposed iterative algorithm for asymptotically nonexpansive mappings under some mild conditions in Banach spaces.