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Percutaneous Nephrolithotomy in Patients on Chronic Anticoagulant/Antiplatelet Therapy
Nerli RB,M N Reddy,S Devaraju,M B Hiremath 전남대학교 의과학연구소 2012 전남의대학술지 Vol.48 No.2
Percutaneous nephrolithotomy (PCNL) is an integral component in the management of large volume renal stone disease either as monotherapy or in combination with shock wave lithotripsy. Stone disease in patients on chronic anticoagulation/antiplatelet therapy, however, poses a difficult scenario. Bleeding is a major concern for any patient undergoing PCNL. We retrospectively analyzed our series of patients with renal calculi who were on chronic anticoagulant therapy and who underwent PCNL. We reviewed the case records of patients undergoing PCNL during the period from January 2005to December 2011. We analyzed the changes in preoperative and postoperative hemoglobin,serum creatinine, and clotting parameters, as well as intraoperative and postoperative bleeding and thromboembolic complications. During the 5-year study period,a total of 36 patients (30 males and 6 females) with a mean age of 46.33±9.96 years (range, 29-61 years) who were on chronic anticoagulant/antiplatelet therapy underwent PCNL for urolithiasis. The mean size of the stone was 6.40±1.98 cm2 (range, 2.8-9cm2). The mean operating time was 62.08±10.10 min. The bleeding was successfully managed in all patients and the anticoagulant/antiplatelet agents were restarted after an appropriate duration. The mean rise in serum creatinine at discharge was 0.05±0.03mg/dl and the mean fall in serum hemoglobin was 1.63±0.77 g/dl. At 3 months after surgery, the stone-free rate was 100%. With careful preoperative care and regulation of anticoagulation/antiplatelet therapy and appropriate intraoperative management,PCNL can be performed safely and successfully in properly selected patients with renal calculi who are on chronic anticoagulant/antiplatelet therapy
Osman ?ner,?nal Ge?gel,Tarık Avcu 한국탄소학회 2021 Carbon Letters Vol.31 No.1
Starting materials are very significant to produce activated carbons because every starting material has a different chemical structure; hence they affect the surface functional groups and surface morphologies of obtained activated carbons. In this study, sycamore balls, ripe black locust seed pods, and Nerium oleander fruits have been used as starting materials by ZnCl2 chemical activations for the first time. Firstly, activated carbons were obtained from these starting materials with ZnCl2 chemical activation by changing production conditions (carbonization time, carbonization temperature, and impregnation ratio) also affecting the structural and textural properties of the resultant activated carbons. Then, the starting materials and resultant activated carbons were characterized by utilizing diverse analysis techniques, such as TGA, elemental analysis, proximate analysis, BET surface areas, pore volumes, pore size distributions, N2 adsorption–desorption isotherms, SEM, FTIR spectra, and H2 adsorption isotherms. The highest surface areas were determined to be 1492.89, 1564.84, and 1375.47 m2/g for the activated carbons obtained from sycamore balls, ripe black locust seed pods, and N. oleander fruits, respectively. The yields of these activated carbons with the highest surface areas were calculated to be around 40%. As the carbonization temperature increased with sufficient ZnCl2 amount, N2 adsorption–desorption isotherms began to turn into Type IV isotherms given by mesoporous adsorbents with its hysteresis loops. Also, their hysteresis loops resembled Type H4 loop generally associated with narrow slit-like pores. Moreover, hydrogen uptakes under 750 mmHg at 77 K were determined to be 1.31, 1.48, and 1.24 wt% for the activated carbons with the maximum surface areas produced from sycamore balls, ripe black locust seed pods, and N. oleander fruits, respectively. As a result, the highest surface areas of the activated carbons with different structural properties produced in this study were obtained with different production conditions.
An approach for Traffic Signal Control using RFID in the u-City
서강도(SEO Gangdo),?mit ?zg?ner,조진호(Cho Jinho) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.10
현재 우리나라에는 최첨단의 정보통신 서비스를 제공을 목적으로 ubiquitous city(u-City)가 건설 중에 있다. 이들 도시에서 ITS(Intelligent Transportation Systems)는 도시거주민들에게 적절한 교통 정보를 제공하는 동시에 최적으로 도시교통을 제어하는 방안이다. ITS의 한 부분으로서 교통흐름에 적합한 교통신호제어가 필요하며 이를 위해 많은 교통정보를 실시간으로 수집하여야 한다. 이러한 교통정보의 수집은 도시운영을 위하여 최첨단 정보통신 서비스가 제공되는 u-City에서는 어렵지 않을 것이다. 이러한 미래지향적인u-City의 ITS 교통제어에 적합한 새로운 시스템에 대하여 이 논문에서는 연구하였다.
Electronic properties of carbon nanotube/fabric composites
David S. Hecht,Liangbing Hu,George Gr?ner 한국물리학회 2007 Current Applied Physics Vol.7 No.1
Single walled carbon nanotube (SWNT)/fabric composite materials were manufactured using two simple manufacturing processes. Thetransfer technique. The composite retains high mechanical strength (governed by the fabric), and good electrical properties (determinedby the nanotubes). We measure the DC electrical conductivity of the composite fabric to be 5.33 S/cm for the sprayed tubes, 13.8 S/cmfor the incubated SWNTs, and 8 S/cm for the QLB transferred tubes; these values are limited not by the nanotube network, but by thesurface roughness of the fabric itself. Measurements of the conductivity up to 1 MHz reveal a transport process that proceeds along a ran-.C)andmechanicaldeformations.Theconductivityofthecompositedecreasesbylessthan10%whenbentaroundacylinder of1 cmdiameter.
Plants cultivated in Choco, Colombia, as source of repellents against Tribolium castaneum (Herbst)
Karina Caballero-Gallardo,Nayive Pino-Benitez,Nerlis Pajaro-Castro,Elena Stashenko,Jesus Olivero-Verbel 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.4
Essential oils (EOs) of eight plants collected in Choco, Colombia, including Piper divaricatum, P. pseudolanceifolium,P. confertinodum, P. diazanum, Ocimum campechianum, Siparuna conica, Mikania micrantha and Hedychiumcoronarium, were analyzed by gas chromatography–mass spectrometry and tested as repellents against Triboliumcastaneum, using the area preference method, after 2 and 4 h exposure. The main components found in EOswere methyl eugenol, trans-β-cariophyllene, methyl eugenol, α-pinene, δ-cadinene, γ-elemene, α-pinene and1,8-cineol, for O. campechianum, P. pseudolanceifolium, P. divaricatum, P. confertinodum, P. diazanum, S. conica,M. micrantha, and H. coronarium, respectively. Best repellent activities were observed for oils fromO. campechianum and P. pseudolanceifolium with mean repellent concentration (RC50) values of 0.00006 and0.0001 μL/cm2 after 2 h, and 0.00003 and 0.0001 μL/cm2 after 4 h, respectively; whereas the least potent wasthat from M. micrantha, with RC50 values of 0.074 and 0.040 μL/cm2 at 2 and 4 h exposure times, respectively. Based on average percentage repellence, oils from P. pseudolanceifolium and O. campechianum were classifiedas Class IV repellents and were better than the commercial repellent IR3535, classified as Class II. These data evidencethe Choco region as an important source of natural repellents with promising commercial opportunities.