Experimental Studies on Progressive Collapse Behavior of RC Frame Structures: Advances and Future Needs

Wei?Jian Yi,Fan Yi,Yun Zhou 한국콘크리트학회 2021 International Journal of Concrete Structures and M Vol.15 No.4

In the recent two decades, the progressive collapse of reinforced concrete (RC) frame structures attracted unprecedented research interests in the structural engineering community. Experiments are regarded as an essential method in this field since actual cases can barely provide sufficient and effective data to support rigorous research. In this paper, prevailing experimental assumptions and configurations among over 100 series of experiments are quantitatively revealed by a bibliometric collection based on systematic search in an academic database. Since numerous experiments have been reported on the progressive collapse of RC frame structures, this paper subsequently presents a state-of-the-art review summarizing both experimental consensuses and controversies constituted by three main aspects: (a) static mechanisms, (b) dynamic behavior, and (c) threat-dependent research. The significance of secondary mechanisms, existing problems of dynamic effects, and potential flaws of the threat-independent assumption are discussed in detail with experimental findings. Future needs are emphasized on research targets, correlations between experiments and design, dynamic effects, threat-dependent issues, and retrofitting. These recommendations might help researchers or designers realize a more reliable and realistic progressive collapse design of RC frame structures in the future.

The Religious Belief of Chinese Yi People Embodied in Bimo Culture

웨이이 ( Wei Yi ) 한국동양예술학회 2020 동양예술 Vol.49 No.-

이 논문은 중국 이족 집단에 대한 종교 신앙 체계의 변천과 재구성의 단초인 原初性과 再生性을 연구한다. 이족의 문화는 비교적 안정된 전통을 가지고 있으면서도 시대와 지역, 장르별로 차이가 있다. 이 논문에서 언급하고자 하는 변화는 정상적인 역사와 문화의 법칙 속에서 발전한 것으로, 예를 들어 물과 같은 재생적인 성질을 통해 얻을 수 있는 자연의 생리변화의 이치와 상통하는 점이 있다. 한 지역의 문화도 전승에서 재구성되는 것이 자연의 섭리이자, 이족문화의 종교 신앙 체계 역시 그 예라 할 수 있겠다. 이족의 종교는 지역과 교통이 발달하지 않은 이유로 역사적으로는 비교적 안정된 집단적 형태를 지녔지만, 이러한 안정된 집단 형태도 끊임없이 자기변화와 외래 문화 흡수를 통해 이족 고유의 색채를 보완해 왔다. 따라서 이 논문은 중국 이족의 전통인 畢摩文化에 대한 연구를 통해 이족의 종교문화를 이론적으로 정확하게 인식할 수 있도록 도와주고, 소수민족 문화의 가치를 이해하게 해준다. Through exploration of the memory of Chinese Yi ethnic group, this paper expounds the change and reconstruction of Yi religious belief system from the historical dimension, and studies its "primitive" and "regenerative" natures. Yi culture has its stable tradition, and shows different changes in different times, geographies and scenarios. The author believes that the above changes occur and develop in a normal historical and cultural frame. A "regenerative" evolution also exists, which is similar to the source of water. If no fresh water pours in, it cannot form a river, and may even dry up. All cultures regenerate and reconstruct themselves according to natural law, and the religious belief system in Yi culture is of no exception, and such changes and reconstruction are consistent with the living practice of ethnic groups. Due to geographical and traffic reasons, Yi religious belief remains steady in its form in history, but it is also gradually improved during continuous self-transformation and absorption of foreign culture. Through study of traditional Bimo culture of Yi people in China, this paper can help readers to understand Yi religious culture and its values from a theoretical perspective.

GreenIoT Architecture for Internet of Things Applications

( Yi-wei Ma ),( Jiann-liang Chen ),( Yung-sheng Lee ),( Hsin-yi Chang ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.2

A power-saving mechanism for smartphone devices is developed by analyzing the features of data that are received from Internet of Things (IoT) sensors devices to optimize the data processing policies. In the proposed GreenIoT architecture for power-saving in IoT, the power saving and feedback mechanism are implemented in the IoT middleware. When the GreenIoT application in the power-saving IoT architecture is launched, IoT devices collect the sensor data and send them to the middleware. After the scanning module in the IoT middleware has received the data, the data are analyzed by a feature evaluation module and a threshold analysis module. Based on the analytical results, the policy decision module processes the data in the device or in the cloud computing environment. The feedback mechanism then records the power consumed and, based on the history of these records, dynamically adjusts the threshold value to increase accuracy. Two smart living applications, a biomedical application and a smart building application, are proposed. Comparisons of data processed in the cloud computing environment show that the power-saving mechanism with IoT architecture reduces the power consumed by these applications by 24% and 9.2%.

Enhanced low-temperature activity and huimid-SO2 resistance of MnFe-based multi-oxide catalysts for the marine NH3-SCR reaction

Yi Wei,Wenhua Li,Qi Wang,Mengyu Liu,Peiyuan Liang,Lina Wang,Tianjun Sun 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-

Several MnFe-based multi-metal oxides were synthesized as NH3-SCR catalysts by a simple coprecipitationmethod for abating NOx of marine diesel exhausts. The Co and Nb-doped MnFeCeAl catalysts exhibitNOx conversion over 90% and N2 selectivity above 95% at 180–270 C, especially the MnFeCeAlCo catalystscan inhibit nearly all sulfate species growth within 150 ppm humid-SO2 gases at 225 C. The structuralcharacterization results revealed that Co, Nb, Sm, and Sb doping can enhance interactions amongdifferent components and promote active component dispersion. Temperature programmed analysisindicated that the Co doping is not only more favorable for improving redox properties, but can alsoenhance the surface acidity, which are advantageous to improve the activity, N2 selectivity, andhumid-SO2 resistance. Moreover, the XPS results implied that the binding energy shift or the valence variationof the Sm, Sb, Nb, and Co species on catalyst surfaces are favored to raise the atomic ratios of highvalentMn species and surface adsorbed oxygen, which can promote the redox property significantly andfurther facilitate SCR activity. Accordingly, the excellent activity and humid-SO2 tolerance of theMnFeCeAlCo catalyst should attribute to its lower redox temperature, strong interaction between oxides,47.3% surface Mn4+/Mn3+ species, and 71.8% adsorbed oxygen, which provide a method for improving theSCR performances of MnFe-based catalysts with humid SO2 resistance.

Fault Diagnosis of Marine Turbocharger System Based on an Unsupervised Algorithm

Yi Wei,Hailong Liu,Gengxuan Chen,Jiawei Ye 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.3

The fault diagnosis of a marine turbocharger system is very crucial for realizing intelligent operation and maintenance in a big data analysis context. In order to improve the diagnostic rate of faults in engineering applications, in this paper, a new unsupervised machine learning algorithm, which is based on one-class support vector machine (OSVM), afnity propagation (AP) and Gaussian mixture model (GMM), called OAGFD is proposed for fault diagnosis. OSVM was frstly used to divide samples of marine turbocharger system into normal and fault samples, and only the fault samples are used in following steps to identify specifc fault types. The AP was adopted automatically to provide an initial value for expectation maximization, which can obtain the maximum value of iteration parameters. The GMM is used to classify faults of marine turbocharger system and output the fault diagnosis results. Finally, the OAGFD is validated by actual data. The experiment results show that OAGFD can quickly and accurately be trained. The OAGFD method can achieve higher identifcation accuracy for multi-faults of marine turbocharger system and takes on faster operation speed and stronger generalization ability than tradition methods. It is an efcient and unsupervised fault diagnosis technique and has both theoretical and practical value. This research provides a new method for automatic fault diagnosis of the marine turbocharger system.

Albumin-to-Fibrinogen Ratio as an Independent Prognostic Parameter in Untreated Chronic Lymphocytic Leukemia: A Retrospective Study of 191 Cases

Yi-Xin Zou,Jia Qiao,Hua-Yuan Zhu,Rui-Nan Lu,Yi Xia,Lei Cao,Wei Wu,Hui Jin,Wen-Jie Liu,Jin-Hua Liang,Jia-Zhu Wu,Li Wang,Lei Fan,Wei Xu,Jian-Yong Li 대한암학회 2019 Cancer Research and Treatment Vol.51 No.2

Purpose Chronic lymphocytic leukemia (CLL) is one of the most frequent type of B-cell chronic lymphoproliferative disorders and chronic inflammation takes part in the development of CLL. However, there has been no valid immune biomarker to predict the prognosis of untreated CLL patients. Materials and Methods In this retrospective study, we analyzed the clinical correlations and prognostic value of albumin-to-fibrinogen ratio (AFR) detected at diagnosis in 191 CLL patients. Results The cut-off value of AFR was 9.7 calculated by X-tile. Patients who were more than 65 years old were often accompanied by low level of AFR (p < 0.001). Survival analysis showed that patients with low level of AFR had shorter overall survival (OS) than patients with high level of AFR (p < 0.001). Multivariate analysis illustrated that AFR had a negative impact on OS (p=0.003) and was independent of parameters involved in CLL international prognostic index and other prognostic markers such as CD38 and ZAP-70. Conclusion These data provide a comprehensive view of AFR and shows that AFR at diagnosis is an adverse prognostic factor in untreated CLL patients.

Letter: cervicocerebral atherosclerosis and its hepatic and coronary risk factors in patients with liver cirrhosis

Yi-Chun Huang,Chih-Wei Chen,James Chun-Chung Wei 대한간학회 2022 Clinical and Molecular Hepatology(대한간학회지) Vol.28 No.2

Structural evaluation of an existing steel natatorium by FEM and dynamic measurement

Wei Liu,Wei-Cheng Gao,Yi Sun,Yan-Lei Yu 국제구조공학회 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.31 No.5

Based on numerical and experimental methods, a systematic structural evaluation of a steel natatorium in service was carried out in detail in this paper. Planning of inspection tasks was proposed firstly according to some national codes in China in order to obtain the economic and reliable results. The field visual inspections and static computation were conducted in turn under in-service environmental conditions. Further a three-dimensional finite element model was developed according to its factual geometry properties obtained from the field inspection. An analytical modal analysis was performed to provide the analytical modal properties. The field vibration tests on the natatorium were conducted and then two different system identification methods were used to obtain the dynamic characteristics of the natatorium. A good correlation was achieved in results obtained from the two system identification methods and the finite element method (FEM). The numerical and experimental results demonstrated that the main structure of the natatorium in its present status is safe and it still satisfies the demand of the national codes in China. But the roof system such as purlines and skeletons must be removed and rebuilt completely. Moreover the system identification results showed that field vibration test is sufficient to identify the reliable dynamic properties of the natatorium. The constructive suggestion on structural evaluation of the natatorium is that periodic assessment work must be maintained to ensure the natatorium’s safety in the future.

China`s Role in Dealing with the North Korean Nuclear Issue

Yi Wei Wang 한국학술연구원 2005 Korea Observer Vol.36 No.3

Anti-Inflammatory Effects of Naringin in Chronic Pulmonary Neutrophilic Inflammation in Cigarette Smoke-Exposed Rats

Yi-Chu Nie,Hao Wu,Pei-Bo Li,Yu-Long Luo,Kang Long,Li-Ming Xie,Jian-Gang Shen,Wei-Wei Su 한국식품영양과학회 2012 Journal of medicinal food Vol.15 No.10

Naringin, a well-known flavanone glycoside of grapefruit and citrus fruits, was found to be as an effective anti-inflammatory compound in our previous lipopolysaccharide-induced acute lung injury mouse model via blockading activity of nuclear factor κB. The current study sought to explore the anti-inflammatory effects of naringin on chronic pulmonary neutrophilic inflammation in cigarette smoke (CS)-induced rats. Seventy Sprague-Dawley rats were randomly divided into seven groups to study the effects of CS with or without various concentrations of naringin or saline for 8 weeks. The results revealed that naringin supplementation at 20, 40, and 80 mg/kg significantly increased body weight of CS-induced rats as compared to that in the CS group. Moreover, naringin of 20, 40, and 80 mg/kg prevented CS-induced infiltration of neutrophils and activation of myeloperoxidase and matrix metalloproteinase-9, in parallel with suppression of the release of cytokines, such as tumor necrosis factor-α and interleukin-8 (IL-8). IL-10 in bronchoalveolar lavage fluid was significantly suppressed after CS exposure, but dose dependently elevated by naringin. The results from hematoxylin and eosin staining revealed that naringin dose dependently reduced CS-induced infiltration of inflammatory cells, thickening of the bronchial wall, and expansion of average alveolar airspace. In conclusion, our data suggest that naringin is an effective anti-inflammatory compound for attenuating chronic pulmonary neutrophilic inflammation in CS-induced rats.