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정균호,송승곤,박경완,석중현,김경민,박윤선 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.5
We fabricated an Al / AlOx / Al device by using a RF magnetron sputter system. The device showed a unipolar resistive switching process. In this study, the switching mechanism of the device followed the conductive filament model. The conduction mechanisms for the conductive filament model were explained by using Ohmic conduction for the low resistance state (LRS) and Schottky emission for the high resistance state (HRS). The average value of the resistance ratio between the HRS and the LRS was about 3.48 × 107 when the reading voltage (0.1 V) was achieved. The electrical property of the endurance was achieved under 50 switching cycles. A low switching voltage could be obtained for a low power consuming device. These results proved that the AlOx material has various possibilities for use in nonvolatile random access memory applications.
비-휘발성 저항 변화 메모리 응용을 위한 WO<sub>x</sub> 물질의 전기적 특성 연구
정균호,김경민,송승곤,박윤선,박경완,석중현,Jung, Kyun Ho,Kim, Kyong Min,Song, Seung Gon,Park, Yun Sun,Park, Kyoung Wan,Sok, Jung Hyun 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.5
In this study, we observed current-voltage characteristics of the MIM (metal-insulator-metal) structure. The $WO_x$ material was used between metal electrodes as the oxide insulator. The structure of the $Al/WO_x/TiN$ shows bipolar resistive switching and the operating direction of the resistive switching is clockwise, which means set at negative voltage and reset at positive voltage. The set process from HRS (high resistance state) to LRS (low resistance state) occurred at -2.6V. The reset process from LRS to HRS occurred at 2.78V. The on/off current ratio was about 10 and resistive switching was performed for 5 cycles in the endurance characteristics. With consecutive switching cycles, the stable $V_{set}$ and $V_{reset}$ were observed. The electrical transport mechanism of the device was based on the migration of oxygen ions and the current-voltage curve is following (Ohm's Law ${\rightarrow}$ Trap-Controlled Space Charge Limited Current ${\rightarrow}$ Ohm's Law) process in the positive voltage region.
비-휘발성 저항 변화 메모리 응용을 위한 WOx 물질의 전기적 특성 연구
석중현,정균호,김경민,송승곤,박윤선,박경완 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.5
In this study, we observed current-voltage characteristics of the MIM (metal-insulator-metal) structure. The WOx material was used between metal electrodes as the oxide insulator. The structure of the Al/WOx/TiN shows bipolar resistive switching and the operating direction of the resistive switching is clockwise, which means set at negative voltage and reset at positive voltage. The set process from HRS (high resistance state) to LRS (low resistance state) occurred at . The reset process from LRS to HRS occurred at . The on/off current ratio was about and resistive switching was performed for 5 cycles in the endurance characteristics. With consecutive switching cycles, the stable and were observed. The electrical transport mechanism of the device was based on the migration of oxygen ions and the current-voltage curve is following (Ohm’s Law → Trap-Controlled Space Charge Limited Current → Ohm’s Law) process in the positive voltage region. 본 실험에서, 우리는 MIM(Metal-Insulator-Metal) 구조의 전류-전압 특성들을 관찰하였다. 금속 전극들 사이에 산화 절연체로서 WOx 물질을 사용하였다. Al/WOx/TiN의 구조는 양극성 저항 변화 스위칭을 보여주고 저항 변화 스위칭의 동작 방향은 음의 전압에서 set, 양의 전압에서 reset인 시계 방향이다. 높은 저항 상태에서 낮은 저항 상태로 변하는 set 과정은 –2.6 V에서 일어났다. 낮은 저항 상태에서 높은 저항 상태로 변하는 reset 과정은 2.78 V에서 일어났다. On/Off 전류비는 10이었고, 내구성 특성을 위해 5번 주기의 저항 변화 스위칭을 실행하였다. 연속전인 스위칭 주기에 따라 안정적인 Vset과 Vreset은 관찰되었다. 소자의 전기적인 수송 메커니즘은 산소 이온들의 이동을 기초로 하며 전류 전압 곡선은 양의 전압 영역에서 (옴의 법칙 → 공간 전하 제한 전류 → 옴의 법칙) 과정을 따른다.
자동차용 아연도금강판의 심 용접조건과 용접성에 관한 연구
임재규,정균호,국중하 대한용접접합학회 2001 대한용접·접합학회지 Vol.19 No.1
This paper is studied about welding conditions and weldability of seam welding for galvanized steel sheet of automotive. The fuel tank of automobile is made by seam welding to be required of airtight or oiltight. This method have required a short time for welding, simplicity operation progress and little HAZ. Especially, it has more less residual stress and transformation than different welding progress. So, this study is for decreasing the leakage occurrence rate and to make standard operating condition table anyone can operate easily. Therefore, this study is analyzed the optimum conditions of seam welding for making the automobile with galvanized steel sheets by means of observing the microstructure and configuration back projection, RT, tensile-shear strengths test and SEM. Optimum conditions of seam welding obtained as follows, current 17.2-17.6kA speed 1.0m/min weld time 4:10:6 and current 16.5-17.4kA, speed 0.83m/min, weld time 4:10:4 at t1.0, and current, 18.5-18.9kA, speed 0.8m/min, weld time 4:10:4 and current 16.5-17.4kA, speed 0.68m/mi, weld time 4:10:2 at t1.6.
당뇨병성 신증 환자에서 저분자량 헤파린 Dalteparin Sodium 사용 중 발생한 후복막강 혈종 1예
정택균,정균호,박병석,마성권,김수완,김남호,최기철 대한내과학회 2003 대한내과학회지 Vol.64 No.3
신대체 요법의 유무에 관계없이 신기능 장애가 있는 환자에서 항응고 치료로 저분자량 헤파린 (dateparin, enoxaparin 등)을 사용할 경우에는 제제에 관계없이 심한 출혈의 위험성이 높아질 수 있기 때문에 세심한 주의를 요한다. 6~8일 이상 투여하는 것은 삼가고 심각한 출혈을 일으킬 수 있음을 항상 주지하여야 하며 , 특히 항응고 치료 과정 중에 치료 전 없었던 옆구리, 서혜부, 하요부 및 하지의 통증 , 빈혈, 저혈압 등이발생하였을 때 후복막강 혈종의 가능성을 항상 고려하여야 할 것이다. Retroperitoneal Hematoma is a rare intraabdominal bleeding occurring in patients with low-molecular weight heparin anti-coagulant therapy. we report a case of dalteparin sodium-associated retroperitoneal hematoma in a 70-year-old man with diabetic nephropathy with review of this condition in the literature. He had been suffered from type 2 diabetes mellitus and hypertension for 15 years. In July 2002, he was admitted to our hospital because of unstable angina and left pleural effusion. He was treated with dalteparin sodium and aspirin for unstable angina. On the second hospital day, he was referred to division of nephrology for diabetic nephropathy. Laboratory data on admission included white blood cell count of 4,500/㎣, hemoglobin 9.6 g/dL, platelet count 294,000/㎣, BUN 58.1 mg/dL, serum creatinine 4.1 mg/dL, blood glucose 178 mg/dL, hemoglobin A1c5.9T, PT 13.9 sec (INR: 1.09), and aPTT 50 sec, On days 6 through 8, he had lower back pain, lower extremity pain and neuropathy, anemia and hypotension. Abdominal ultrasound showed 6×6 cm-sized well marginated mixed echogenic lesion in psoas muscle and fluid collection in retroperitoneal cavity. Magnetic resonance imaging (MRI) showed increased signal intensity and thickening of the right psoas muscle including 4.7×2.3×21 cm-sized cytic lesion and 6.2×5.3×3.7 cm-sized cystic lesion on the lateral portion of right psoas muscle in T2-weighted images. Percutaneous drainage of cystic lesion was performed by right lateral approach. Hemodialysis was begun without heparinization. Abdominal CT showed 5.5×5 cm-sized high attenuated lesion in right psoas muscle and 5×3 cm, 3×2 cm, 4.5×2.5 cm, 4×2.5 cm-sized heterogeneous, slightly high attenuated lesions in the right lower abdomen and cul-de-sac in the scans with no enhancement. He was treated by conservative therapy. He recovered gradually. Patients with kidney diseases receiving low molecular weight heparin (dalteparin, enoxaparin, etc) should be closely monitored to prevent serious bleeding complications. The possibility of retroperitoneal hematoma should be considered, whenever symptoms including lower back pain, inguinal pain, leg pain, anemia, or hypotension occurred during the lower molecular weight heparin anticoagulant therapy. To our knowledge, this is the first reported case of retroperitoneal hematoma in a patient during dalteparin sodium (Fragmin^??) anticoagulant therapy. (Korean J Med 64:322-327, 2003)