Comparative Study of Exposure Assessment of Dust in Building Materials Enterprises Using ART and Monte Carlo

Jiang Wei,Wu Zonghao,Zhang Mengqi,Zhang Haoguang 한국산업안전보건공단 산업안전보건연구원 2024 Safety and health at work Vol.15 No.1

Background Dust generated during the processing of building materials enterprises can pose a serious health risk. The study aimed to compare and analyze the results of ART and the Monte Carlo model for the dust exposure assessment in building materials enterprises, to derive the application scope of the two models. Methods First, ART and the Monte Carlo model were used to assess the exposure to dust in each of the 15 building materials enterprises. Then, a comparative analysis of the exposure assessment results was conducted. Finally, the model factors were analyzed using correlation analysis and the scope of application of the models was determined. Results The results show that ART is mainly influenced by four factors, namely, localized controls, segregation, dispersion, surface contamination, and fugitive emissions, and applies to scenarios where the workplace information of the building materials enterprises is specific and the average dust concentration is greater than or equal to 1.5 mg/m3. The Monte Carlo model is mainly influenced by the dust concentration in the workplace of building materials enterprises and is suitable for scenarios where the dust concentration in the workplace of the building materials enterprises is relatively uniform and the average dust concentration is less than or equal to 6mg/m3. Conclusion ART is most accurate when workplace information is specific and average dust concentration is > 1.5 mg/m3; whereas, The Monte Carlo model is the best when dust concentration is homogeneous and average dust concentration is < 6 mg/m3. Background Dust generated during the processing of building materials enterprises can pose a serious health risk. The study aimed to compare and analyze the results of ART and the Monte Carlo model for the dust exposure assessment in building materials enterprises, to derive the application scope of the two models. Methods First, ART and the Monte Carlo model were used to assess the exposure to dust in each of the 15 building materials enterprises. Then, a comparative analysis of the exposure assessment results was conducted. Finally, the model factors were analyzed using correlation analysis and the scope of application of the models was determined. Results The results show that ART is mainly influenced by four factors, namely, localized controls, segregation, dispersion, surface contamination, and fugitive emissions, and applies to scenarios where the workplace information of the building materials enterprises is specific and the average dust concentration is greater than or equal to 1.5 mg/m3. The Monte Carlo model is mainly influenced by the dust concentration in the workplace of building materials enterprises and is suitable for scenarios where the dust concentration in the workplace of the building materials enterprises is relatively uniform and the average dust concentration is less than or equal to 6mg/m3. Conclusion ART is most accurate when workplace information is specific and average dust concentration is > 1.5 mg/m3; whereas, The Monte Carlo model is the best when dust concentration is homogeneous and average dust concentration is < 6 mg/m3.

A Dynamic Keyed Block Encryption Algorithm

Jiang, Wei,Kim, Sung-Je,Park, Kyoo-Seok Korea Multimedia Society 2008 멀티미디어학회논문지 Vol.11 No.6

In this paper, we propose a dynamic keyed block encryption algorithm. Most existing encryption algorithms are designed such that the key is not changed. Therefore, they have a disadvantage that plaintext could be easily exposed by differential and linear cryptanalysis. In the proposed algorithm, several key generators are designed, and a key generator is attached to the encryption procedure. After performing the encryption procedure, ciphertext and the initial key generating values are transferred to the receiver's key generator for decryption. Through simulation, the proposed algorithm is verified to satisfy the requirements of real-time processing and proved to have a high strength. It can be applied to practical use.

The Synergistic Anticancer Effect of Artesunate Combined with Allicin in Osteosarcoma Cell Line in Vitro and in Vivo

Jiang, Wei,Huang, Yong,Wang, Jing-Peng,Yu, Xiao-Yun,Zhang, Lin-Yi Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.8

Background: Artesunate, extracted from Artemisia annua, has been proven to have anti-cancer potential. Allicin, diallyl thiosulfinate, the main biologically active compound derived from garlic, is also of interest in cancer treatment research. This object of this report was to document synergistic effects of artesunate combined with allicin on osteosarcoma cell lines in vitro and in vivo. Methods: After treatment with artesunate and allicin at various concentrations, the viability of osteosarcoma cells was analyzed by MTT method, with assessment of invasion and motility, colony formation and apoptosis. Western Blotting was performed to determine the expression of caspase-3/9, and activity was also detected after drug treatment. Moreover, in a nude mouse model established with orthotopic xenograft tumors, tumor weight and volume were monitored after drug administration via the intraperitoneal (i.p.) route. Results: The viability of osteosarcoma cells in the combination group was significantly decreased in a concentration and time dependent manner; moreover, invasion, motility and colony formation ability were significantly suppressed and the apoptotic rate was significantly increased through caspase-3/9 expression and activity enhancement in the combination group. Furthermore, suppression of tumor growth was evident in vivo. Conclusion: Our results indicated that artesunate and allicin in combination exert synergistic effects on osteosarcoma cell proliferation and apoptosis.

A Scheme to Improve SOS Security against DDoS Attack Using Active Network Technology

( Jiang Wei ),( Choong Seon Hong ) 한국정보처리학회 2004 한국정보처리학회 학술대회논문집 Vol.11 No.2

Secure overlay services (SOS) architecture has been proposed to provide reliable communication between clients and a target under DDoS attacks. The SOS architecture employs a set of overlay nodes arranged in three hierarchical layers that controls access to the target. Although the architecture is novel and works well under simple congestion based attacks, we observe that when the attacker uses same malicious traffic raid the SOS nodes, the SOS system can not responses this kind of repeating action, and wastes the chance to collect the information of attacker. We propose a scheme to improve the secure overlay services (SOS) against the DDoS attack.

Controlling spinning pitch property by tetrahydrofuran-soluble fraction of coal tar pitch co-carbonization with petrolatum

Jiang Wei,Ni Guosong,Zuo Pingping,Qu Shijie,Li Yunmei,Niu Hongxian,Shen Wenzhong 한국탄소학회 2019 Carbon Letters Vol.29 No.5

Isotropic pitch-based carbon fiber was successfully prepared from tetrahydrofuran-soluble fraction of coal tar pitch co-carbonization with petrolatum by air-blowing. The effects of reaction temperature and time, amount of petrolatum added on the composition and spinning properties of resultant pitches were investigated. It indicated that petrolatum could effectively improve the softening point, aromaticity, hydrogen content and molecular weight of the resultant pitches by promoting cross-linking and dehydrogenation polymerization reactions at low air-blowing temperature. Moreover, more aliphatic and naphthenic structures had been introduced into resultant pitches as addition of petrolatum and also inhibited the generation of quinoline-insoluble particles. The obtained green fibers were facile to be stabilized and carbonized and the resultant carbon fibers showed fully isotropic and finer, uniform diameter with smooth surface and higher tensile strength of up to 0.92 GPa. It provided a facile chemical modification method for isotropic pitch-based carbon fiber production.

Research on Model of Vehicle Logistics Transportation Plan

Jiang Wei,Zhou Baoping,Kang Shunguang,Liu Chan 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.9

The vehicle logistics is a complex branch in the field of logistics. Because of vehicles and vehicle transporters have a variety of specifications, the current logistics company make transportation plan mainly depends on scheduling personnel's experience, in the face of complex transportation tasks, however, are often inefficient, and transportation cost is not ideal. This paper used the E problem dates of the National Mathematical Modeling Contest for Postgraduates in 2014 to study the mathematical model is established to solve the problem of loading method of vehicles and transportation plan. Firstly, 2207 vehicles can be divided into four categories, we used MATLAB to calculation the loading method of vehicles for 10 types of vehicle transporters, then we take vehicle transporter minimum number as optimization objective, with vehicle demand and the proportion of vehicle transporters as the constraint conditions, to establish the integer programming model, and finally we used LINGO programming to calculate the optimal transport plan is: vehicle transporter minimum number is 127.

Contactless Power Charger for Light Electric Vehicles Featuring Active Load Matching

Jiang, Wei,Xu, Song,Li, Nailu The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.1

Contactless power transfer technology is gaining increasing attention in city transportation applications because of its high mobility and flexibility in charging and its commensurate power level with conductive power transfer method. In this study, an inductively coupled contactless charging system for a 48 V light electric vehicle is proposed. Although this study does not focus on system efficiency, the generic problems in an inductively coupled contactless power transfer system without ferromagnetic structure are discussed. An active load matching method is also proposed to control the power transfer on the receiving side through a load matching converter. Small signal modeling and linear control technology are applied to the load matching converter for port voltage regulation, which effectively controls the power flow into the load. A prototype is built, and experiments are conducted to reveal the intrinsic characteristics of a series-series resonant inductive power charger in terms of frequency, air gap length, power flow control, coil misalignment, and efficiency issues.

DNA Methylation Biomarkers for Nasopharyngeal Carcinoma: Diagnostic and Prognostic Tools

Jiang, Wei,Cai, Rui,Chen, Qiu-Qiu Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.18

Nasopharyngeal carcinoma (NPC) is a common tumor in southern China and south-eastern Asia. Effective strategies for the prevention or screening of NPC are limited. Exploring effective biomarkers for the early diagnosis and prognosis of NPC continues to be a rigorous challenge. Evidence is accumulating that DNA methylation alterations are involved in the initiation and progression of NPC. Over the past few decades, aberrant DNA methylation in single or multiple tumor suppressor genes (TSGs) in various biologic samples have been described in NPC, which potentially represents useful biomarkers. Recently, large-scale DNA methylation analysis by genome-wide methylation platform provides a new way to identify candidate DNA methylated markers of NPC. This review summarizes the published research on the diagnostic and prognostic potential biomarkers of DNA methylation for NPC and discusses the current knowledge on DNA methylation as a biomarker for the early detection and monitoring of progression of NPC.

Clinical effectiveness of different types of bone-anchored maxillary protraction devices for skeletal Class III malocclusion: Systematic review and network meta-analysis

Wang, Jiangwei,Yang, Yingying,Wang, Yingxue,Zhang, Lu,Ji, Wei,Hong, Zheng,Zhang, Linkun The Korean Association Of Orthodontists 2022 대한치과교정학회지 Vol.52 No.5

Objective: This study aimed to estimate the clinical effects of different types of bone-anchored maxillary protraction devices by using a network meta-analysis. Methods: We searched seven databases for randomized and controlled clinical trials that compared bone-anchored maxillary protraction with tooth-anchored maxillary protraction interventions or untreated groups up to May 2021. After literature selection, data extraction, and quality assessment, we calculated the mean differences, 95% confidence intervals, and surface under the cumulative ranking scores of eleven indicators. Statistical analysis was performed using R statistical software with the GeMTC package based on the Bayesian framework. Results: Six interventions and 667 patients were involved in 18 studies. In comparison with the tooth-anchored groups, the bone-anchored groups showed significantly more increases in Sella-Nasion-Subspinale (°), Subspinale-Nasion-Supramentale(°) and significantly fewer increases in mandibular plane angle and the labial proclination angle of upper incisors. In comparison with the control group, Sella-Nasion-Supramentale(°) decreased without any statistical significance in all treated groups. IMPA (angle of lower incisors and mandibular plane) decreased in groups with facemasks and increased in other groups. Conclusions: Bone-anchored maxillary protraction can promote greater maxillary forward movement and correct the Class III intermaxillary relationship better, in addition to showing less clockwise rotation of mandible and labial proclination of upper incisors. However, strengthening anchorage could not inhibit mandibular growth better and the lingual inclination of lower incisors caused by the treatment is related to the use of a facemask.

An effective route for growth of WO3/BiVO4 heterojunction thin films with enhanced photoelectrochemical performance

Chunyun Hou,Jiangwei Yu,Jin-Rui Ding,Weiqiang Fan,Hongye Bai,Dongbo Xu,Wei-dong Shi 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.104 No.-

The unsatisfactory solar light absorption of WO3 and poor charge separation of BiVO4 are main limits fortheir use in photoelectrochemical (PEC) water oxidation. Coupling WO3 with BiVO4 has been consideredas a feasible way to improve PEC performance by taking complementary advantages of them. In thiswork, we obtained nanoflake-structured WO3 by hydrothermal growth with post-annealing. The effectof process variables on morphology and resultant performance were investigated. Electrodepositiongrowth was utilized to deposit BiVO4 onto WO3 forming WO3/BiVO4 heterojunction thin films. PorousBiVO4 with wormlike morphology was tightly coupled and well-distributed onto WO3 nanoflakes. Theoptimized best-performing WO3/BiVO4 photoanode exhibits higher photocurrent density than that summationof bare WO3 and BiVO4 over entire range of applied potential. This enhancement is mainly attributedto the effective charge separation at WO3/BiVO4 interface, which is confirmed throughelectrochemical impedance spectra (EIS) measurements, respectively. Our work provides a referableapproach for the growth of WO3/BiVO4 heterojunction photoanode with enhanced PEC performance.