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Thermal Energy Harvesting용 센서회로의 저전력 구동 방법
남현경,코아반팜,트란바오손,응웬반티엔,민경식,Nam, Hyun Kyung,Pham, Van Khoa,Tran, Bao Son,Nguyen, Van Tien,Min, Kyeong-Sik 한국전기전자학회 2018 전기전자학회논문지 Vol.22 No.3
본 논문에서는 열전에너지 하베스팅에 의해 구동되는 센서 회로를 저전력으로 동작시킬 수 있는 방법을 제안하였다. 본 논문에서 사용되는 열전소자를 이용하면 에너지 하베스팅 회로에서 8uA의 전류를 얻을 수 있다. 그러나 구동하려고 하는 센서의 전류 소비는 이보다 훨씬 크기 때문에, 본 논문에서는 하드웨어 방법으로 power gating scheme을 이용한 저전력 구동과 소프트웨어적으로 active/sleep control scheme을 이용한 저전력 구동 방법을 센서 회로에 적용하여 센서 회로의 전류 소비를 감소시킬 수 있음을 보였다. 먼저 하드웨어 power gating scheme을 사용할 때에는 파워 게이트의 Toff/Ton의 비를 22보다 더 크게 하면, 센서 회로의 전류 소비가 8uA 이하로 줄어드는 것을 확인하였다. 또한 소프트웨어 기반의 active/sleep control scheme에 의한 저전력 구동에서는 Tslp/Tact의 비를 3 이상으로 설정해주면 전류 소비를 8uA 이하로 줄일 수 있음을 확인하였다. 본 논문에서의 결과는 열전에너지 하베스팅에 의해서 구동되는 다양한 센서 회로 설계 및 구현에 도움이 될 것으로 생각된다. In this paper, we propose low-power operational methods for thermal-energy-harvesting sensor circuits. Here, the amount of harvested current has been measured as low as 8uA. However the DC power consumption of the sensor circuit is known to consume much larger than 8uA. Thus, We propose the hardware-based power gating and software-based active/sleep timing control schemes, respectively, for controlling the power consumption of sensor circuit. In the hardware-based power gating scheme, if the ratio of Toff/Ton is larger than 22, the sensor can consume less than 8uA. For the software-based active/sleep control scheme, if the ratio of Tslp/Tact is larger than 3, we can suppress the current consumption below 8uA. The hardware-based and software-based schemes proposed in this paper would be helpful in various applications of energy-harvesting sensor circuits, where the power consumption is limited by an amount of harvested energy.
증례 : 신장 ; 발작성 야간혈색소뇨증에서 발생한 급성 신부전증
남현경 ( Hyun Kyung Nam ),유현승 ( Hyun Seung Yoo ),안원석 ( Won Suk An ),김성은 ( Seong Eun Kim ),김성현 ( Sung Hyun Kim ),나서희 ( Seo Hee Rha ),윤성국 ( Seong Kuk Yoon ) 대한내과학회 2009 대한내과학회지 Vol.77 No.5S
저자들은 PNH 진단 후 2년간 경구 스테로이드로 조절하던 중 상기도 감염과 동시에 용혈 발작과 단백뇨를 동반한 급성 신부전이 발생, 신생검과 신장 자기공명촬영을 통해 혈철소 침착을 확인하였으나 다른 만성적 신손상 소견 없이 급성 세뇨관 괴사 소견만을 보였던 환자에서 급성 신부전회복 후 골수 이식을 시행하여 치료하고 신기능을 정상으로 유지하였던 경험을 문헌고찰과 함께 보고하는 바이다. Paroxysmal nocturnal hemoglobinuria (PNH) is an acquired chronic hemolytic anemia characterized by persistent intravascular hemolysis. The kidneys are subject to acute failure or chronic injury in association with ischemia, intravascular hemolysis, and he-mosiderin deposition; however the pathogenesis of renal failure has not been clearly defined. In Korea, there has been 1 case of acute renal failure with PNH demonstrated by MRI and a kidney biopsy. A 39-year-old female patient with PNH who received low dose oral prednisolone for 2 years developed oliguric acute renal failure after 2 days of fever and sore throat. The serum LDH level was elevated, and indirect bilirubinemia was noted. A renal biopsy showed features of acute tubular necrosis and hemosiderosis. Magnetic resonance imaging revealed characteristic features of renal hemosiderosis. There was no evidence of either renal vein thrombosis or cortical infarct. Her renal function became stabilized with hemodialysis and intravenous fluid, and she recovered 4 weeks later. (Korean J Med 77:S1231-S1236, 2009)
단백뇨가 있는 기관지 확장증 환자에 발생한 이차성 신장 유전분증
남현경 ( Hyun Kyung Nam ),나서희 ( Seo Hee Rha ),이수걸 ( Soo Gul Lee ),이성원 ( Seong Won Lee ),안원석 ( Won Suk An ),김성은 ( Seong Eun Kim ),김기현 ( Ki Hyun Kim ) 대한내과학회 2005 대한내과학회지 Vol.69 No.-
Secondary amyloidosis is a disorder characterized by the deposition of amyloid A (AA) in multiple organs and tissues in the body. We report a case of bronchiectasis-related secondary renal amyloidosis with proteinuria. A 29-year-old male was admitted to our hospital for evaluation of foamy urine. He has been bothered from a large amount of mucopurulent sputum since 11 years. He had medical history of bronchiectasis and maxillary sinusitis. He had adenomatous goiter and showed hypothyroidism. Immunoelectrophoresis of serum and urine were nonspecific. Serum amyloid A level was high (243.0 ug/mL, reference value ; 0-8 ug/mL) and C-reactive protein was increased (3.8 mg/dL, reference value ; 0-0.5 mg/dL). Renal, thyroid and rectal biopsy revealed infiltration of homogenous material and showed apple-green birefringence in Congo-red stain. Apple-green birefringence in Congo-red stain of kidney, thyroid and rectum after potassium permanganate pretreatment was disappeared for the most part. We treated him with colchicine (1.2 mg per day). After a year, his proteinuria was persisted, but renal function was normal. (Korean J Med 69:S900-S905, 2005)
Icodextrin과 포비돈액 반응으로 진단한 복막 투석액의 흉강 누출
유현승 ( Hyun Sung Yoo ),남현경 ( Hyun Kyung Nam ),안원석 ( Won Seok An ),김성은 ( Seung Eun Kim ),김기현 ( Ki Hyun Kim ) 대한내과학회 2009 대한내과학회지 Vol.77 No.6
Hydrothorax occurs as a complication of peritoneal dialysis in about 2% of cases. When a pleural effusion occurs, the effusion should be analyzed as part of the differential diagnosis. A hydrothorax due to peritoneal dialysate leakage can be suspected based on higher glucose and lower protein content compared with serum. Computed tomography (CT) peritoneography, peritoneal scintigraphy, and magnetic resonance peritoneography are safe, accurate, and reliable methods for diagnosing hydrothorax. Here, we report a case of hydrothorax associated with dialysate leakage that could not be confirmed using standard CT peritoneography. We confirmed the leakage by observing the change in color to black in a test that involved adding povidone-iodine to the pleural fluid obtained by thoracentesis after a cycle of peritoneal dialysis with icodextrin solution. We propose using the icodextrin-povidone reaction as a test for hydrothorax caused by dialysate leakage. (Korean J Med 77:775-779, 2009)