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Resistive Switching Effects of Zinc Silicate for Nonvolatile Memory Applications
임민호,김지수,박경완,석중현 한국전기전자재료학회 2022 전기전자재료학회논문지 Vol.35 No.4
Resistive switching behaviors of a co-sputtered zinc silicate thin film (ZnO and SiO2 targets) have been investigated. We fabricated an Ag/ZnSiOx/highly doped n-type Si substrate device by using an RF magnetron sputter system. X-ray diffraction pattern (XRD) indicated that the Zn2SiO4 was formed by a post annealing process. A unique morphology was observed by scanning electron microscope (SEM) and atomic force microscope (AFM). As a result of annealing process, 50 nm sized nano clusters were formed spontaneously in 200~300 nm sized grains. The device showed a unipolar resistive switching process. The average value of the ratio of the resistance change between the high resistance state (HRS) and the low resistance state (LRS) was about 106 when the readout voltage (0.5 V) was achieved. Resistance ratio is not degraded during 50 switching cycles. The conduction mechanisms were explained by using Ohmic conduction for the LRS and Schottky emission for the HRS.
치핵치료를 위한 도플러 유도하 치핵동맥결찰술의 초기경험
임민호,김광호,정순섭,남선영,이령아 대한대장항문학회 2009 Annals of Coloproctolgy Vol.25 No.4
Purpose: Doppler-guided hemorrhoidal artery ligation (HAL) is an alternative technique to the standard Milligan-Morgan hemorrhoidectomy. The purpose of this pilot study is to introduce the HAL technique for grade 2-3 internal hemorrhoids and to evaluate the efficacy of this technique in Korea in terms of results and patient satisfaction. Methods: The HAL procedure was performed on 29 patients with grade 2 or 3 internal hemorrhoids. Twenty-eight procedures were performed under local anesthesia with lidocaine, and one procedure was performed under general anesthesia due to synchronous surgery for gallstones. With the lithotomy position, the pulsation of the hemorrhoidal artery was localized using a doppler probe, and 3-6 branches of the hemorrhoidal artery were ligated with vicryl 2-0. Patient course was evaluated before and after the procedure by using questionnaires with a visual analog scale. Results: The mean age of the patients was 44±24 yr. There were no significant complications with this procedure. At 3 mo after the operation, symptom scores of anal pain, anal bleeding, and anal prolapse were significantly improved (0.4, 1.0, and 2.4, respectively) compared to the symptom scores before the operation (3.4, 4.6, and 5.9, respectively). The postoperative satisfaction score was 8.1, and the recommendation score was 8.5. Conclusion: HAL is a safe and effective technique to relieve anal pain, bleeding, and prolapse of internal hemorrhoids. A comparative study with other procedures and a long-term follow-up after HAL should be the basis for valdating the efficacy of this procedure. Purpose: Doppler-guided hemorrhoidal artery ligation (HAL) is an alternative technique to the standard Milligan-Morgan hemorrhoidectomy. The purpose of this pilot study is to introduce the HAL technique for grade 2-3 internal hemorrhoids and to evaluate the efficacy of this technique in Korea in terms of results and patient satisfaction. Methods: The HAL procedure was performed on 29 patients with grade 2 or 3 internal hemorrhoids. Twenty-eight procedures were performed under local anesthesia with lidocaine, and one procedure was performed under general anesthesia due to synchronous surgery for gallstones. With the lithotomy position, the pulsation of the hemorrhoidal artery was localized using a doppler probe, and 3-6 branches of the hemorrhoidal artery were ligated with vicryl 2-0. Patient course was evaluated before and after the procedure by using questionnaires with a visual analog scale. Results: The mean age of the patients was 44±24 yr. There were no significant complications with this procedure. At 3 mo after the operation, symptom scores of anal pain, anal bleeding, and anal prolapse were significantly improved (0.4, 1.0, and 2.4, respectively) compared to the symptom scores before the operation (3.4, 4.6, and 5.9, respectively). The postoperative satisfaction score was 8.1, and the recommendation score was 8.5. Conclusion: HAL is a safe and effective technique to relieve anal pain, bleeding, and prolapse of internal hemorrhoids. A comparative study with other procedures and a long-term follow-up after HAL should be the basis for valdating the efficacy of this procedure.
최현일(崔鉉一),임민호(任民鎬) 경인행정학회 2005 한국정책연구 Vol.5 No.2
도시화에 따른 도시의 성장은 상업지역의 확대와 지가급등으로 주거지역의 교외이전을 가속화시켜 도심의 공동화 현상을 가져온다. 이러한 도심공동화는 주간에는 경제활동인구와 유동인구가 증가하게 되지만 야간에 상주인구가 큰 폭으로 감소하여 도시기능의 마비, 야간 치안부재, 주민감소로 재정이 약화되는 등 많은 폐해를 가져오고 있어 이에 대한 대응책이 필요하다. 우리나라의 경우 1960년대 이후 급격한 산업화와 도시화를 거치며 대도시에 인구와 산업이 집중하며 많은 도시문제를 불러왔으며, 이러한 대도시에 인구와 산업의 집중은 필연적으로 도심공동화를 불러와 이에 대한 대응 정책이 필요하게 되었다. 특히 최근 정부의 공기업 지방이전을 계기로 그동안 진행되던 도심의 쇠퇴와 인구유출이 보다 심각하게 진행될 것으로 예상되고 있어 이에 대한 신속한 대응이 필요한 시점이라고 할 수 있다. 본 논문에서는 우리나라의 도심공동화의 원인과 문제점을 분석하고, 연구의 지속적 유입과 도심기능이 원활하게 유지될 수 있는 도심주거의 활성화 방안을 제시하고 있다.