Chinese Enterprises’ Investment in Infrastructure Construction in Cambodia

( Fang Hu ),( Xiekui Zhang ),( Mingming Hu ),( David Lee Cook ) 경남대학교 극동문제연구소 2019 ASIAN PERSPECTIVE Vol.43 No.1

One of the important means of promoting connectivity and cooperation between China and Cambodia is Chinese enterprises’ investment in Cambodian infrastructure construction. The Belt and Road Initiative proposed by China brings both opportunities and challenges for Cambodia’s economic development. Through an analysis of detailed case studies, in this article we review the background on Chinese infrastructure investment in Cambodia and identify factors in the approach to investment by Chinese enterprises in the Cambodian context that appear to underlie these challenges and suggest opportunities for improvements.

A reversible data hiding scheme in JPEG bitstreams using DCT coefficients truncation

( Mingming Zhang ),( Quan Zhou ),( Yanlang Hu ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.1

A reversible data hiding scheme in JPEG compressed bitstreams is proposed, which could avoid decoding failure and file expansion by means of removing of bitstreams corresponding to high frequency coefficients and embedding of secret data in file header as comment part. We decode original JPEG images to quantified 8×8 DCT blocks, and search for a high frequency as an optimal termination point, beyond which the coefficients are set to zero. These blocks are separated into two parts so that termination point in the latter part is slightly smaller to make the whole blocks available in substitution. Then spare space is reserved to insert secret data after comment marker so that data extraction is independent of recovery in receiver. Marked images can be displayed normally such that it is difficult to distinguish deviation by human eyes. Termination point is adaptive for variation in secret size. A secret size below 500 bits produces a negligible distortion and a PSNR of approximately 50 dB, while PSNR is also mostly larger than 30 dB for a secret size up to 25000 bits. The experimental results show that the proposed technique exhibits significant advantages in computational complexity and preservation of file size for small hiding capacity, compared to previous methods.

Biometry of width between labial transitional line angles in anterior teeth: an observational study

Chao Wen,Hongqiang Ye,Hu Chen,Yongsheng Zhou,Mingming Huang,Yuchun Sun 대한치과보철학회 2022 The Journal of Advanced Prosthodontics Vol.14 No.1

PURPOSE. The maximum width between the mesial and distal labial transitional line angles, described as “esthetic width” herein, could significantly influence the visual perception of the teeth and smile. This study aimed to conduct biometric research on esthetic width and to explore whether regular distribution exists in the esthetic width of human teeth. MATERIALS AND METHODS. A total of 4,264 maxillary and mandibular anterior teeth were measured using the Geomagic studio software program. The proportions of maxillary to mandibular homonymous teeth and proportions between the adjacent teeth were calculated. Bilateral symmetry and the correlation between the esthetic and mesiodistal widths were both accounted for during the measurement procedures. RESULTS. The mean esthetic widths were 6.773 ± 0.518 mm and 4.329 ± 0.331 mm for maxillary and mandibular central incisors, respectively, 5.451 ± 0.487 mm and 5.008 ± 0.351 mm for maxillary and mandibular lateral incisors, respectively, and 3.340 ± 0.353 mm and 5.958 ± 0.415 mm for maxillary and mandibular canines, respectively. Except for the mandibular canines, no significant difference in esthetic width was found among homonymous teeth from the same jaw. A high linear correlation was found between the esthetic and mesiodistal widths of the same tooth, except for the maxillary canines. Esthetic width proportions among different tooth categories showed some regular patterns, which were similar to those of the mesiodistal width. CONCLUSION. Esthetic width is regularly distributed among the teeth in the Chinese population. This could provide an important reference for anterior dental restorations and dimension recovery in esthetic reconstruction of anterior teeth.

The Feasibility of Using Biomarkers Derived from Circulating Tumor DNA Sequencing as Predictive Classifiers in Patients with Small-Cell Lung Cancer

Yu Feng,Yutao Liu,Mingming Yuan,Guilan Dong,Hongxia Zhang,Tongmei Zhang,Lianpeng Chang,Xuefeng Xia,Lifeng Li,Haohua Zhu,Puyuan Xing,Hongyu Wang,Yuankai Shi,Zhijie Wang,Xingsheng Hu 대한암학회 2022 Cancer Research and Treatment Vol.54 No.3

Purpose To investigate the feasibility of biomarkers based on dynamic circulating tumor DNA (ctDNA) to classify small cell lung cancer (SCLC) into different subtypes. Materials and Methods Tumor and longitudinal plasma ctDNA samples were analyzed by next-generation sequencing of 1,021 genes. PyClone was used to infer the molecular tumor burden index (mTBI). Pre-treatment tumor tissues [T1] and serial plasma samples were collected (pre-treatment [B1], after two [B2], six [B3] cycles of chemotherapy and at progression [B4]). Results Overall concordance between T1 and B1 sequencing (n=30) was 66.5%, and 89.5% in the gene of <i>RB1</i>. A classification method was designed according to the changes of <i>RB1</i> mutation, named as subtype Ⅰ (both positive at B1 and B2), subtype Ⅱ (positive at B1 but negative at B2), and subtype Ⅲ (both negative at B1 and B2). The median progressive-free survival for subtype Ⅰ patients (4.5 months [95%CI: 2.6-5.8]) was inferior to subtype Ⅱ (not reached, p<0.0001) and subtype Ⅲ (10.8 months [95%CI: 6.0-14.4], p=0.002). The median overall survival for subtype Ⅰ patients (16.3 months [95%CI: 5.3-22.9]) was inferior to subtype Ⅱ (not reached, p=0.01) and subtype Ⅲ (not reached, p=0.02). Patients with a mTBI dropped to zero at B2 had longer median overall survival (not reached vs. 19.5 months, p=0.01). The changes of mTBI from B4 to B1 were sensitive to predict new metastases, with a sensitivity of 100% and a specificity of 85.7%. Conclusion Monitoring ctDNA based <i>RB1</i> mutation and mTBI provided a feasible tool to predict the prognosis of SCLC.

A New Satisfaction Evaluation Method Based on Fuzzy Clustering

Jingfei Ren,Yonghuan He,Mingming Hu,Maozhu Jin,Huafeng Gao 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.9

In recent years, the world tourism is developing rapidly. The world tourism firstly hit 1 billion in 2012. Along with the tourism booming, complaint cases are growing and tourists' satisfaction degree is dropping. In this case, to ensure the interests of tourists and keep sustainable development of tourism, the tourists' satisfaction should be evaluated and the Scenic should be improved based on the evaluation result. In this paper, a new tourist satisfaction evaluation method is proposed based on fuzzy clustering. Firstly, the large scale evaluation data is divided to parts by the fuzzy clustering method. Then, each center of the parts is chosen to evaluate the tourist satisfaction. The new evaluation method is different from the traditional methods. It can effectively cut the evaluation scale. Finally, the tourist satisfaction of Three Gorges Scenic is studied to interpret the new evaluation method.

Efficient Certificateless Signature Scheme on NTRU Lattice

( Jia Xie ),( Yupu Hu ),( Juntao Gao ),( Wen Gao ),( Mingming Jiang ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.10

Because of the advantages of certificateless and no escrow feature over the regular signature and identity-based signature, certificateless signature has been widely applied in e-business, e-government and software security since it was proposed in 2003. Although a number of certificateless signature schemes have been proposed, there is only one lattice-based certificateless signature scheme which is still secure in the quantum era. But its efficiency is not very satisfactory. In this paper, the first certificateless signature scheme on NTRU lattice is proposed, which is proven to be secure in random oracle model. Moreover, the efficiency of the new scheme is higher than that of the only one lattice-based certificateless signature.

Cardiac-specific overexpression of Ndufs1 ameliorates cardiac dysfunction after myocardial infarction by alleviating mitochondrial dysfunction and apoptosis

Qi Bingchao,Song Liqiang,Hu Lang,Guo Dong,Ren Gaotong,Peng Tingwei,Liu Mingchuan,Fang Yexian,Li Chunyu,Zhang Mingming,Li Yan 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-

Myocardial infarction (MI) is the leading cause of premature death among adults. Cardiomyocyte death and dysfunction of the remaining viable cardiomyocytes are the main pathological factors of heart failure after MI. Mitochondrial complexes are emerging as critical mediators for the regulation of cardiomyocyte function. However, the precise roles of mitochondrial complex subunits in heart failure after MI remain unclear. Here, we show that NADH:ubiquinone oxidoreductase core subunit S1 (Ndufs1) expression is decreased in the hearts of heart failure patients and mice with myocardial infarction. Furthermore, we found that cardiac-specific Ndufs1 overexpression alleviates cardiac dysfunction and myocardial fibrosis in the healing phase of MI. Our results demonstrated that Ndufs1 overexpression alleviates MI/hypoxia-induced ROS production and ROS-related apoptosis. Moreover, upregulation of Ndufs1 expression improved the reduced activity of complex I and impaired mitochondrial respiratory function caused by MI/hypoxia. Given that mitochondrial function and cardiomyocyte apoptosis are closely related to heart failure after MI, the results of this study suggest that targeting Ndufs1 may be a potential therapeutic strategy to improve cardiac function in patients with heart failure.

Simpler Efficient Group Signature Scheme with Verifier-Local Revocation from Lattices

( Yanhua Zhang ),( Yupu Hu ),( Wen Gao ),( Mingming Jiang ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.1

Verifier-local revocation (VLR) seems to be the most flexible revocation approaches for any group signature scheme, because it just only requires the verifiers to possess some up-to-date revocation information, but not the signers. Langlois et al. (PKC 2014) proposed the first VLR group signature based on lattice assumptions in the random oracle model. Their scheme has at least O(n²)·logN bit group public key and O (n) ·log N bit signature, respectively. Here, n is the security parameter and N is the maximum number of group members. In this paper, we present a simpler lattice-based VLR group signature, which is more efficient by a(log)ONfactor in both the group public key and the signature size. The security of our VLR group signature can be reduced to the hardness of learning with errors (LWE) and small integer solution (SIS) in the random oracle model.

Performance of Ca-Based Oxygen Carriers Decorated by K₂CO₃ or Fe₂O₃ for Coal Chemical Looping Combustion

Guo, Qingjie,Liu, Yongzhuo,Jia, Weihua,Yang, Mingming,Hu, Xiude,Ryu, Ho-Jung American Chemical Society 2014 ENERGY AND FUELS Vol.28 No.11

<P>Chemical looping combustion (CLC) of coal is an attractive technology with inherent CO<SUB>2</SUB> separation and high energy utilization efficiency. The large-scale preparation of a cheap oxygen carrier with high attrition resistance challenges the scale-up step of CLC reactor systems. To improve the reactivity between the CaSO<SUB>4</SUB>/bentonite (CaBen) oxygen carrier and coal, CaSO<SUB>4</SUB>–Fe<SUB>2</SUB>O<SUB>3</SUB>/bentonite (CaFeBen) and CaSO<SUB>4</SUB>–K<SUB>2</SUB>CO<SUB>3</SUB>/bentonite (CaKBen), decorated by Fe<SUB>2</SUB>O<SUB>3</SUB> and K<SUB>2</SUB>CO<SUB>3</SUB>, respectively, were prepared in this work. The active component content, multi-cycle reactivity, and enhancement mechanism of two decorated oxygen carriers were investigated in a fluidized bed with steam as the gasification–fluidization medium. Finally, three types of coals, including lignite, bitumite, and anthracite, were used as fuel. The addition of Fe<SUB>2</SUB>O<SUB>3</SUB> and K<SUB>2</SUB>CO<SUB>3</SUB> can improve the reactivity of the CaBen oxygen carrier but degrade the attrition resistance slightly. The multiple-cycle experiments indicated that Fe<SUB>2</SUB>O<SUB>3</SUB> itself is the oxygen carrier for coal CLC with high reactivity, while K<SUB>2</SUB>CO<SUB>3</SUB> acts as the catalysis for coal gasification. The carbon conversion rate of the three coals that reacted with the CaKBen oxygen carrier was higher than that with CaFeBen as the oxygen carrier because of catalysis of potassium on the coal gasification reaction. However, the CaKBen oxygen carrier particles were seriously sintered, and the potassium content in the oxygen carrier reduced with the increasing redox cycles. The coals with high volatile and ash contents have a high instantaneous rate of carbon conversion reacted with two decorated oxygen carriers.</P>

STUDY ON HYDRAULIC CHARACTERISTICS OF MULTIFUNCTION SURGE TANK

FU ZONGFU,YAN ZHONGMIN,LIU MINGMING,HU NAN 한국수자원학회 2005 한국수자원학회 학술대회 Vol.2005 No.1