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Chai Hui-hui,Zhao Yu,Zeng Zeng,Ye Rui-zhong,Hu Qiao-hong,He Hong-feng,Baek Jung Hwan,Peng Cheng-zhong 대한영상의학회 2022 Korean Journal of Radiology Vol.23 No.5
Objective: To assess the efficacy and safety of ultrasound (US)-guided radiofrequency ablation (RFA) in patients with primary hyperparathyroidism (PHPT). Materials and Methods: This prospective study enrolled 39 participants (14 male, 25 female; mean age, 59.5 ± 15.3 [range, 18–87] years) between September 1, 2018, and January 31, 2021. All participants had parathyroid lesions causing PHPT, proven biochemically and through imaging. The imaging features of the PHPT nodules, including the shape, margin, size, composition, and location, were evaluated before treatment. Serum intact parathyroid hormone, calcium, and phosphorus levels; parathyroid nodule volume; and PHPT-related symptoms were recorded before and after treatment. We calculated the technical success, biochemical cure, and clinical cure rates for these patients. Complications were evaluated during and after the ablation. Results: Complete ablation was achieved in 38 of the 39 nodules in the 39 enrolled participants. All the patients were treated in one session. The technical success rate was 97.4% (38/39). The mean follow-up duration was 13.2 ± 4.6 (range, 6.0–24.9) months. At 6 and 12 months post-RFA, the biochemical cure rates were 82.1% (32/39) and 84.4% (27/32), respectively, and the clinical cure rates were 100% (39/39) and 96.9% (31/32), respectively. Only 2.6% (1/39) of the patients had recurrent PHPT. At 1, 3, 6, and 12 months after technically successful RFA, 44.7% (17/38), 34.3% (12/35), 15.8% (6/38), and 12.5% (4/32) of participants, respectively, had elevated eucalcemic parathyroid hormone levels. Recurrent laryngeal nerve paralysis occurred in 5.1% (2/39) of the patients, who recovered spontaneously within 1–3 months. Conclusion: US-guided RFA was effective and safe for PHPT patients. RFA may be an alternative treatment tool for patients who cannot tolerate or refuse to undergo surgery.
Hui Chai,Waheed Ur Rehman,Xuyun Yang,Tao Meng,Renyang He 한국섬유공학회 2022 Fibers and polymers Vol.23 No.10
To improve the wear resistance of friction components coated with epoxy resin, a titanium-multi-walled carbonnanotubes (Ti-MWCNT) reinforced epoxy resin composite coating was designed and prepared by combining metalnanoparticles and inorganic nanoparticles into a hybrid filler using Ti nanoparticles and MWCNT as raw materials. Thechanges in functional groups of pure resin and Ti-MWCNT reinforced epoxy resin composites were analyzed using infraredspectroscopy. The hardness, fracture toughness and tribological properties of pure resin and Ti-MWCNT-reinforced epoxyresin composite coatings with different contents of Ti-MWCNT filler (0, 2 wt.%, 4 wt.%, 6 wt.%, 8 wt.%) were determinedexperimentally. The fracture and wear mechanisms of Ti-MWCNT-reinforced epoxy resin composites were also revealedwith the aid of scanning electron microscopy. The results showed that the bonding form of Ti-MWCNT hybrid filler andepoxy resin was physical bonding. The addition of appropriate amount of Ti-MWCNT hybrid filler effectively improved thehardness, fracture toughness and tribological properties of epoxy resin. When 6 wt.% Ti-MWCNT hybrid filler was added,the optimum composite was obtained with hardness and fracture toughness of 676 HL and 0.922 MPa·m1/2, and frictioncoefficient and wear rate of 0.347 and 4.71×10-13 m3(N·m)-1, respectively. However, the performance of the compositecoating gradually decreased when the filler content was increased to 8 wt.%. In summary, the addition of appropriate amountof Ti-MWCNT hybrid filler can effectively improve the hardness, fracture toughness and tribological properties of epoxyresin. Ti nanoparticles react chemically with oxygen and effectively fill the microcracks generated in the resin matrix. TheMWCNT filler limits the movement of the surrounding resin matrix due to the difference in size and prolongs the diffusionpath of the microcracks in the resin matrix. The interaction between the two filler components significantly improves theperformance of the composite coating.
Hui Ji,Hui Wang,Qiumei Ji,Winbo Ji,Xiaolin Luo,Jiabo Wang,Zhixin Chai,Jinwei Xin,Xin Cai,Zhijuan Wu,Jikun Wang,Jincheng Zhong 한국유전학회 2020 Genes & Genomics Vol.42 No.11
Background miRNAs play an important role in regulating normal animal development. Muscle tissue and fat metabolismare important for maintaining energy balance in animals. Yak has important agricultural and economic importance as itprovides milk, meat, and hair. It is used for transportation as well. However, the miRNA expression profiles of their muscleand adipose tissue are currently unknown. Objective To explore the regulatory roles of miRNAs in the skeletal muscle and adipose tissues of yak. Methods A total of 12 small RNA libraries were constructed from the skeletal muscle and adipose samples from yak aged 0.5,2.5, 4.5, and 7.5 years. High-throughput sequencing and bioinformatics analysis were used to determine the dynamic expressionprofile of miRNA, and a miRNA regulatory network related to muscle and adipose tissue development was established. Results miR-1-3p and miR-143-3p showed the highest expression during yak skeletal muscle and fat development, respectively. The MAPK and Ras signaling pathways were the pivotal pathways. miR-181-5p, miR-542-3p, and miR-424-5p mayhave key roles in skeletal muscle development, and CREBRF, GRB10, CDK1, RFX3, and EPC2 were the core target genes. While miR-127-5p, miR-379-3p, and miR-494-3p may play important regulatory roles in adipose deposition, and ETV1,XPO7, and C5AR2 were the core target genes. Conclusion This study provides valuable resources for further study of the molecular mechanisms underlying yak skeletalmuscle and adipose tissue development, and also a basis for studying the interactions between genes and miRNAs.
Chai, Hui-Seok,Kang, Byoung-Wook,Kim, Jin-Seok,Kim, Jae-Chul The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.6
In the power plant using high temperature fuel cells such as Molten Carbonate Fuel Cell(MCFC), and Solid Oxide Fuel Cell(SOFC), the generated electric power per area of power generation facilities is much higher than any other renewable energy sources. - High temperature fuel cell systems are capable of operating at MW rated power output. - It also has a feature that is short for length of the line for connecting the interior of the generation facilities. In normal condition, these points are advantages for voltage drops or power losses. However, in abnormal condition such as fault occurrence in electrical system, the fault currents are increased, because of the small impedance of the short length of power cable. Commonly, to minimize the thermal-mechanical stresses on the stack and increase the systems reliability, we divided the power plant configuration to several banks for parallel operation. However, when a fault occurs in the parallel operation system of power main transformer, the fault currents might exceed the interruption capacity of protective devices. In fact, although the internal voltage level of the fuel cell power plant is the voltage level of distribution systems, we should install the circuit breakers for transmission systems due to fault current. To resolve these problems, the SFCL has been studied as one of the noticeable devices. Therefore, we analyzed the effect of application of the SFCL on bus tie in a fuel cell power plants system using PSCAD/EMTDC.
Hui-Chao Hu,Hui-Jun Jin,Xin-Sheng Chai 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.1
This paper reports an improved headspace gas chromatographic (HS-GC) technique for thedetermination of oxalate content in bleaching effluents. The method is based on the redox reactionbetween potassium iodate and oxalate, from which the carbon dioxide is generated and measured by HSGC. The results showed that the reaction in a sulfuric acid solution (0.05 mol/L) was complete in 35 minat 95 ℃. The RSD of the method in the repeatability testing was less than 4.5%, the LOQ was 0.35 mg, andthe recovery ranged from 95 to 103%. The present method is simpler, more reliable, and more practicalcompared to the methods reported previously.
Hui-Seok Chai,Byoung-Wook Kang,Jin-Seok Kim,Jae-Chul Kim 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.6
In the power plant using high temperature fuel cells such as Molten Carbonate Fuel Cell(MCFC), and Solid Oxide Fuel Cell(SOFC), the generated electric power per area of power generation facilities is much higher than any other renewable energy sources. - High temperature fuel cell systems are capable of operating at MW rated power output. - It also has a feature that is short for length of the line for connecting the interior of the generation facilities. In normal condition, these points are advantages for voltage drops or power losses. However, in abnormal condition such as fault occurrence in electrical system, the fault currents are increased, because of the small impedance of the short length of power cable. Commonly, to minimize the thermal-mechanical stresses on the stack and increase the systems reliability, we divided the power plant configuration to several banks for parallel operation. However, when a fault occurs in the parallel operation system of power main transformer, the fault currents might exceed the interruption capacity of protective devices. In fact, although the internal voltage level of the fuel cell power plant is the voltage level of distribution systems, we should install the circuit breakers for transmission systems due to fault current. To resolve these problems, the SFCL has been studied as one of the noticeable devices. Therefore, we analyzed the effect of application of the SFCL on bus tie in a fuel cell power plants system using PSCAD/EMTDC.
신뢰도 기반의 민감도 분석을 통한 배전계통 개폐기 투자 우선순위 결정에 관한 연구
채희석(Hui-Seok Chai),신희상(Hee-Sang Shin),허재선(Jae-Sun Huh),강병욱(Byoung-Wook Kang),최성호(Seong-Ho Choi),김재철(Jae-Chul Kim) 대한전기학회 2012 대한전기학회 학술대회 논문집 Vol.2012 No.5
In recent year, power system is required high quality and high reliability. So, KEPCO invests a lot of their budget in order to supply electric power for that. KEPCO tries to change manual switch to automatic switch in their feeder for improving power reliability. However, there is no method to make a reasonable decision. In this paper, its possible to analyze reliability in terms of the system, considering failure rate, duration of failure of section, and can be present more reasonable plan about determining of investment priorities for improving power distribution system to assess the sensitivity.