An Improved DCT-based Image Watermarking Scheme

Ziqiang Cheng(청즈치앙),Dae-Soo Kim(김대수),Kee-Young Yoo(유기영) 대한전자공학회 2010 대한전자공학회 학술대회 Vol.2010 No.6

Many DCT-based watermarking schemes have been proposed in the past few years. In 2009, Lin et al proposed a scheme that focused on resisting JPEG compression attack. However, it fails to verify ownership when cropping reconstruction attack is applied, and the watermarked image degrades quite significantly after embedding watermark bits. In order to solve these problems of Lin et al’s scheme, an improved scheme was proposed in this paper. The experimental results show that the proposed scheme resist on cropping reconstruction attack, and also achieve better invisibility than Lin et al’s scheme.

Effects of Different Atmosphere on Electrochemical Performance of Hard Carbon Electrode in Sodium Ion Battery

Ziqiang Xu,Jinchen Chen,Mengqiang Wu,Cheng Chen,Yaochen Song,Yuesheng Wang 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.4

Hard carbon is deemed to be a most promising anode materials for sodium—ion batteries (SIBs), while, the issues of lowcapacity and low initial coulombic efficiency still exist limiting the development of SIBs. Although high temperature carbonizationof biomass materials under nitrogen or argon atmosphere is a common method for preparation of hard carbon,there are few reports about the effects of different protective atmospheres on propriety of hard carbon. In this article, hornet’snest (HN) is used to prepare hard carbon under nitrogen and argon. At a suitable carbonization temperature (1200 °C and1400 °C), the hard carbon under argon possesses lower specific surface area (25–50 cm−3 g−1), but higher initial coulombefficiency (4–6%) and higher capacity retention (3–6%). Thus, it is inferred that high—performance hard carbon can beobtained under argon atmosphere. Our research about the effect of sintering atmosphere on material properties is expectedto provide a reference for the synthetization of hard carbon by high temperature carbonization.

Research on Process Parameters for Recycling CF/EP Composites by Thermal Excitation of Oxide Semiconductor

Huanbo Cheng,Yancheng Zhu,Ziqiang Zhou,Yu Sun,Jie Zhang 한국섬유공학회 2020 Fibers and polymers Vol.21 No.4

There has a great economic and environmental significance for recycling high performances carbon fibers fromthe waste carbon fiber reinforced polymers. This paper presented a novel method for recycling carbon fiber (CF)/epoxy resin(EP) composites by thermal excitation oxide semiconductor; the effects of process parameters including the temperature,processing time, concentration and flow of O2 on decomposition rate of resin matrix was analyzed; through some methods ofanalysis and testing such as micro-morphology, monofilament tensile strength, Raman spectra, the effects of processparameters on morphology, mechanical property and surface chemistry of the recycle carbon fibers were investigated; thecomponents of the gas products were investigated by gas chromatography. The research findings provided theoreticalfoundations for estimating the process parameters and understanding the general law of resin matrix decomposition.

Avian Leukosis Virus Subgroup J and Reticuloendotheliosis Virus Coinfection Induced TRIM62 Regulation of the Actin Cytoskeleton

Ling Li,Pingping Zhuang,Ziqiang Cheng,Jie Yang,Jianmin Bi,Guihua Wang 대한수의학회 2020 Journal of Veterinary Science Vol.21 No.3

Background: Coinfection with avian leukosis virus subgroup J (ALV-J) and reticuloendotheliosis virus (REV) is common in chickens, and the molecular mechanism of the synergistic pathogenic effects of the coinfection is not clear. Exosomes have been identified as new players in the pathogenesis of retroviruses. The different functions of exosomes depend on their cargo components. Objectives: The aim of this study was to investigate the function of co-regulation differentially expressed proteins in exosomes on coinfection of ALV-J and REV. Methods: Here, viral replication in CEF cells infected with ALV-J, REV or both was detected by immunofluorescence microscopy. Then, we analyzed the exosomes isolated from supernatants of chicken embryo fibroblast (CEF) cells single infected and coinfected with ALV-J and REV by mass spectrometry. KEGG pathway enrichment analyzed the co-regulation differentially expressed proteins in exosomes. Next, we silenced and overexpressed tripartite motif containing 62 (TRIM62) to evaluate the effects of TRIM62 on viral replication and the expression levels of NCK-association proteins 1 (NCKAP1) and actin-related 2/3 complex subunit 5 (ARPC5) determined by quantitative reverse transcription polymerase chain reaction. Results: The results showed that coinfection of ALV-J and REV promoted the replication of each other. Thirty proteins, including TRIM62, NCK-association proteins 1 (NCKAP1, also known as Nap125), and Arp2/3-5, ARPC5, were identified. NCKAP1 and ARPC5 were involved in the actin cytoskeleton pathway. TRIM62 negatively regulated viral replication and that the inhibition of REV was more significant than that on ALV-J in CEF cells coinfected with TRIM62. In addition, TRIM62 decreased the expression of NCKAP1 and increased the expression of ARPC5 in coinfected CEF cells. Conclusions: Collectively, our results indicated that coinfection with ALV-J and REV competitively promoted each other's replication, the actin cytoskeleton played an important role in the coinfection mechanism, and TRIM62 regulated the actin cytoskeleton.

The Effects of Fu Zi on Changes in the Body Heat of Dogs

Tian-Tian Chen,Chunhua Qi,Huijun Guo,Ziqiang Cheng,Dong Zhou,Haitao Liu,Jianzhu Liu 사단법인약침학회 2009 Journal of Acupuncture & Meridian Studies Vol.2 No.1

The aim of the present study was to investigate the effects of Fu Zi on changes in the body heat of dogs. Twelve clinically healthy dogs were divided into two groups: the control group (six dogs) and the experimental group (six dogs). The control group was made to ingest normal saline mixed with canned meat, while the experimental group was made to ingest the Fu Zi solution mixed with canned meat. The infrared thermographic system was used to determine the level of body heat generated by these dogs. These areas include the dorsocranial (DCr), dorsocaudal (DCd), ventrocranial (VCr), and ventrocaudal (VCd) regions at pretreatment and were determined at 10, 20, 30, 50, 90, 120, 240, and 360 minutes after treatment for each of these areas. The results showed a tendency toward increased body heat until 30 minutes after ingestion of the Fu Zi powder mixed with canned meat. The significant differences in the changes of body heat were detected at 360 minutes in the DCd regions, 20 minutes in the VCr regions, and 30 minutes in the VCd regions between the experimental and control groups (p < 0.05). Based from our results, we find that Fu Zi can increase and maintain the dogs’ body heat for at least 6 hours. The aim of the present study was to investigate the effects of Fu Zi on changes in the body heat of dogs. Twelve clinically healthy dogs were divided into two groups: the control group (six dogs) and the experimental group (six dogs). The control group was made to ingest normal saline mixed with canned meat, while the experimental group was made to ingest the Fu Zi solution mixed with canned meat. The infrared thermographic system was used to determine the level of body heat generated by these dogs. These areas include the dorsocranial (DCr), dorsocaudal (DCd), ventrocranial (VCr), and ventrocaudal (VCd) regions at pretreatment and were determined at 10, 20, 30, 50, 90, 120, 240, and 360 minutes after treatment for each of these areas. The results showed a tendency toward increased body heat until 30 minutes after ingestion of the Fu Zi powder mixed with canned meat. The significant differences in the changes of body heat were detected at 360 minutes in the DCd regions, 20 minutes in the VCr regions, and 30 minutes in the VCd regions between the experimental and control groups (p < 0.05). Based from our results, we find that Fu Zi can increase and maintain the dogs’ body heat for at least 6 hours.

Treatment of Mycoplasma wenyonii Infection in Cows with Imidocarb Dipropionate Injection-acupuncture

Jianzhu Liu,Zhengui Yan,Tiantian Chen,Ziqiang Cheng,Huijun Guo,Zhenyong Wang,Yong Wang 사단법인약침학회 2008 Journal of Acupuncture & Meridian Studies Vol.1 No.2

Sixteen shorthorn cows from Xiazhuang farm were admitted to the Veterinary Teaching Hospital at the College of Animal Science and Veterinary Medicine, Shandong Agricultural University for evaluation of poor appetite, listlessness, fever, tachycardia, tachypnea, lethargy, positive jugular venous pulse and anemia. Blood smear examination and polymerase chain reaction analysis in these cows revealed an infection with Mycoplasma wenyonii. The subjects were divided into two groups: control group (three cows) treated with intramuscular injection with imidocarb dipropionate (3 mg/kg/day for 2 days) and the experimental group (13 cows), treated with injection-acupuncture (Imidocarb Dipropionate, 1 mg/kg, once every 3 days for 6 days) at BL17, BL18, BL20, BL25, ST36, SP06 and CV04. At day 15, negative results were found using blood smear examination in all control and experimental groups. Sixteen shorthorn cows from Xiazhuang farm were admitted to the Veterinary Teaching Hospital at the College of Animal Science and Veterinary Medicine, Shandong Agricultural University for evaluation of poor appetite, listlessness, fever, tachycardia, tachypnea, lethargy, positive jugular venous pulse and anemia. Blood smear examination and polymerase chain reaction analysis in these cows revealed an infection with Mycoplasma wenyonii. The subjects were divided into two groups: control group (three cows) treated with intramuscular injection with imidocarb dipropionate (3 mg/kg/day for 2 days) and the experimental group (13 cows), treated with injection-acupuncture (Imidocarb Dipropionate, 1 mg/kg, once every 3 days for 6 days) at BL17, BL18, BL20, BL25, ST36, SP06 and CV04. At day 15, negative results were found using blood smear examination in all control and experimental groups.

The critical time of avian leukosis virus subgroup J-mediated immunosuppression during early stage infection in specific pathogen-free chickens

Feng Wang,Xiaowei Wang,Hongbo Chen,Jianzhu Liu,Ziqiang Cheng 대한수의학회 2011 JOURNAL OF VETERINARY SCIENCE Vol.12 No.3

The critical time of avian leukosis virus subgroup J (ALV-J)-mediated immunosuppression was determined by body weight, relative immune organ weight, histopathology, and presence of group specific antigen and antibodies in specific pathogen-free (SPF) chickens. CD4^+ and CD8^+ cell activity in the spleen, total and differential leukocyte counts in blood, and viral RNA levels in spleen were measured. Significant growth suppression was observed in the two ALV-J-infected groups. A strong immune response by infected groups was present in spleen at 2-weeks-of-age, but after 4-weeks-of-age, the response decreased quickly. The thymus and bursa showed persistent immunosuppression until 4-weeks-of-age. Proliferation of fibroblasts and dendritic cells were observed in immune organs at 4- and 5-weeks-of-age. However, the granulocyte cell number was markedly lower in the infected groups than in the control group. In group 1 (day 1 infection) CD4^+ cells increased during the second week but significantly decreased during the fourth week, while group 2 (day 7 infection) showed the opposite effect. Viral RNA increased significantly by the fourth week. These data identify 3∼4 weeks post-infection as the key time at which the ALV-J virus exerts its immunosuppressive effects on the host.