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Landfill Gas Upgrading as Vehicle Fuel
( Yulee Park ),( Yun-hee Kim ),( Jong-choul Won ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
The demo plant in this study was developed to produce a vehicle fuel. It consisted in sequential continuous unit, the pre-treatment process removing the moisture, siloxanes and H<sub>2</sub>S, the membrane process separating CO<sub>2</sub>, and the PSA process removing the residual N<sub>2</sub> and O<sub>2</sub>. Landfill gas through a pre-processing step showed that H<sub>2</sub>S, total siloxane, water content was also meet all of the criteria biogas fuel. Landfill gas as it passed through the membrane process, the removal efficiency of the CO<sub>2</sub> was about 97%, and CO<sub>2</sub> concentration was about 2.2%.
Molecular characterization of a venom serine protease from the bumblebee Bombus terrestris
Yuling Qiu,Young Moo Choo,Mi Ri Sohn,Hyung Joo Yoon,Hung Dae Sohn,Byung Rae Jin 한국응용곤충학회 2010 한국응용곤충학회 학술대회논문집 Vol.2010 No.05
Bee venom contains a variety of peptides and enzymes, including serine proteases. Here we describe the molecular cloning and characterization of a serine protease (Bt-VSP) isolated from the venom of the bumblebee Bombus terrestris. The Bt-VSP gene consists of six exons encoding a 358-amino acid protein. The form of Bt-VSP detected in bee venom was the 34-kDa mature protein, which is created by cleavage of the catalytic domain of Bt-proVSP between Arg111 and Val112. Bt-VSP activates prothrombin and directly degrades fibrinogen into fibrin degradation products, defining roles for Bt-VSP as a prothrombin activator, a thrombin-like protease, and a plasmin-like protease. The finding that Bt-VSP acts as a fibrin(ogen)olytic enzyme is similar to a previous finding that Bi-VSP, a venom serine protease of B. ignitus, exhibits fibrin(ogen)olytic activity. We also compared major venom components in honeybee and bumblebee, and found that bumblebee venom contains a larger amount of serine protease. Furthermore, unlike bumblebee venom, which exhibits fibrin(ogen)olytic activity owing to the presence of a serine protease, it is likely that honeybee venom lacks fibrin(ogen)olytic activity.
IMC-based Design for Teleoperation Systems with Time Delays
Yuling Li,Yixin Yin,Dezheng Zhang 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.2
The presence of time delays in communication introduces a limitation to the stability of bilateral teleoperation systems. In this study, we address the design of Internal Model Control (IMC)-based controllers for teleoperation systems with arbitrary time delays. The two degrees of freedom IMC structure is utilized for the master and the slave respectively and thus the passivity-assumption on the external forces is not required. The stability of the overall system is analyzed by regarding the whole system as a multivariable system. A performance-oriented controller design process which guarantees the delayed tracking between the master and the slave is also given. Finally, an example is given to validate the effectiveness of the proposed method.
Creep Properties of a Nickel-Based Single Crystal Superalloy with Low Density
Yuling Du,Zihao Tan,Yanhong Yang,Xinguang Wang,Yizhou Zhou,Jingguo Li,Xiaofeng Sun 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
A novel nickel-based single crystal superalloy with low density had been designed and the creep deformation mechanismsof the experiment alloy under two conditions (1050 °C/200 MPa and 1100 °C/137 MPa) had been systematically discussed. The topological inversion had been observed after fracture under the above two conditions. The effects of temperature andstress on creep life of the experiment alloy had been found no significant difference under the two conditions. It was indicatedthat the small decrease in temperature exerted limited influence on the creep behaviors of single crystal superalloys in therange of high temperature.
Unequal Error Protection in Image Transmission Based on LDPC Codes
Yuling Zhang,Xia Li,Hongyong Yang 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.3
This paper investigates the performance of image transmission with unequal error protection (UEP) schemes based on irregular Low-Density Parity-Check (LDPC) codes. Firstly, the UEP is achieved by mapping different bits of the image bytes to different positions of LDPC codes, i.e. the more important bits in the image are mapped to the variable node with higher degrees in irregular LDPC codes, after the channel coding, we map the information bits into a power efficient QAM constellation and map the parity check bits into a spectral efficiency 16QAM constellation. Simulation results show that the UEP scheme is effective.
Antifibrinolytic Role of a Bumbleee (Bombus terrestris) Venom Serine Protease Inhibitor
Yuling Qiu,Kwang Sik Lee,Hyung Joo Yoon,Byung Rae Jin 한국응용곤충학회 2012 한국응용곤충학회 학술대회논문집 Vol.2012 No.05
Bee venom is a rich source of pharmacologically active substances. In this study, we characterized a B. terrestris venom Kunitz-type serine protease inhibitor (Bt-KTI). Bt-KTI consists of two exons encoding 82-amino acids (aa), including a predicted 24-aa signal peptide and a 58-aa mature peptide. Recombinant Bt-KTI was expressed as a 6.5-kDa peptide in baculovirus-infected insect cells. Bt-KTI showed no detectable inhibitory effect on factor Xa, thrombin, or tissue plasminogen activator. In contrast, Bt-KTI strongly inhibited plasmin, indicating that it acts as a plasmin inhibitor. The electrophoretic mobility shift assay showed that Bt-KTI binds to plasmin, indicating the formation of a plasmin-Bt-KTI complex. These results demonstrate that Bt-KTI acts as an antifibrinolytic agent, suggesting a role for Bt-KTI as an anti-bleeding agent.