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후열처리 온도에 따른 Co 박막의 구조 및 자성 특성 변화
박강진,손영준,송세환,이지성,한승훈,주태성,이두용,김송길,박성균 한국물리학회 2024 새물리 Vol.74 No.2
본 연구에서는, flash evaporation 방법으로 Al2O3 (0001) 기판위에 상온 강자성체인 Co 박막을 얇게 증착하고 다양한 후열처리 온도 (800–1000 ◦C)에 따라 dewetting 을 통해 형성된 Co islands 들의 구조적, 자기적 특성을 고찰하였다. 그 결과, 제작된 Co 입자들은 장축의 길이가 높이보다 4 배 이상 큰 타원체 형상을 띄었고, 후열처리 온도가 증가함에 따라 Co 입자의 결정성이 향상되었다. Co 입자들은 FCC 구조 Co (111) 방향으로 성장하였음을 X-선 회절 측정을 통해 확인하였다. 자성특성 측정을 통해 Co 입자의 자기적 특성을 분석한 결과, Co 입자의 in-plane 방향의 포화 자화값은 입자의 크기에 비례하고 보자력은 입자 크기에 반비례하는 것을 확인하였다. 하지만 out-of-plane 방향의 경우, 포화 자화값은 입자의 크기에 비례하지만, 보자력은 열처리 온도와 결정성에 비례하는 것으로 확인된다. 또한, 후열처리 온도가 높아짐에 따라 Co 입자의 in-plane 방향의 자화율이 작아지는 특성을 나타내지만, out-of-plane 방향의 자화율의 변화는 없었다. 이러한 자성 특성의 특이한 측정 방향별 특성변화는 Co 박막의 결정 자기 이방성의 영향을 받은 것으로 추정된다. This study deposited a cobalt (Co) film on the Al2O3(0001) substrate by a flash evaporation method to examine the structural and magnetic property variations depending on the various post-annealing temperatures. Co-film formed islands during annealing due to the surface energy mismatch between the metallic film and the insulating substrate. As a result, the post-annealed Co particles formed an ellipsoid shape with improved crystallinity as temperature increased. Structural analysis confirmed that the Co particles grew in the Co(111)-oriented FCC structure. Interestingly, there are different annealing-temperature-dependent characteristics of magnetic properties depending on the magnetic field direction due to the competing nature between the crystalline and shape anisotropy of the aggregated Co particles.
박강진,정조윤,송영아,김상훈,박정수,조성범,이완식,주영은 대한소화기내시경학회 2011 Clinical Endoscopy Vol.42 No.6
회충은 가장 흔한 장관 내 기생충 감염의 원인으로 대개는 별다른 증상을 일으키지 않으나 위장관의 여러 부위에 이소미입이 일어날 수 있고 이로 인해 장폐쇄, 췌담관질환, 맹장염, 복막염 등의 여러 가지 위장관질환을 유발할 수 있다. 국내의 경우 성공적인 기생충 관리로 회충 감염률이 낮은 상태이나, 최근 기생충감염의 증가 가능성이 제기되고 있으며 이와 관련된 증례도 드물게 보고되고 있다. 상부소장폐쇄의 경우 회충의 종괴형성에 의한 완전 또는 불완전 폐쇄에 대한 보고가 2예 있었으나, 회충증에 의한 십이지장 협착을 보고한 예는 없었다. 저자들은 지속적인 상복부 통증과 구토를 주소로 내원한 환자에서 총담관내 회충미입증과 동반된 십이지장 협착을 진단하고 치료한 1예를 경험하여 보고한다. Infestation with Ascaris lumbricoides is one of the most common helminthic diseases in humans. The highly motile mature worm can cause intestinal obstructions, pancreaticobiliary diseases, appendicitis, and peritonitis. However, biliary ascariasis associated with duodenal stenosis is extremely rare. We report a case of biliary ascariasis with duodenal stenosis in a 70-year-old man. The patient was admitted to our hospital with a 2 month history of epigastric pain and vomiting. An esophagogastroduodenoscopy showed stenosis of the second portion of the duodenum and an impacted living round worm in the ampulla of Vater. The round worm was extracted with a snare without any complications, and the patient received albendazole treatment. A pathological examination of the stenotic portion of the biopsy specimen revealed chronic inflammation with eosinophilic infiltration throughout the mucosa. The patient remained asymptomatic at a follow-up examination. Duodenal stenosis should be considered in the complications of ascariasis, particularly in areas where this parasitic infestation is endemic.
박인서(In Suh Park),강진경(Jin Kyung Kain),김충배(Choong Bai Kim),박효진(Hyo Jin Park),문병수(Byung Soo Moon),이천균(Chun Kyun Lee) 대한소화기학회 1997 대한소화기학회지 Vol.29 No.5
Three patients with epiphrenic diverticula were reviewed with foci on esophageal dysfuntion and its relation to treatment. All cases were identified by bariurn esophagogram and confirmed by endoscopy. Manoetric studies of esophagus documented as diffuse esophageal spasm-like disorder in 1 case, and nonspecific motor disorder in 2 cases. One case was managed surgically, and the other 2 were treated conservatively. We found that epiphrenic diverticulum were associated with esophageal motility disorders. Treatment should be considered to focus on associated motility disorders as well as a diverticulum. (Korean J Gastroenterol 1997;29:687-693)
박효진,강진경,박인서,문영명,정재복,이용찬,김범수 대한소화기학회 1998 대한소화기학회지 Vol.31 No.4
Background/Aims: Seropositivity to CagA and/or VacA has been implicated in the pathogenesis of peptic ulcers. Korea is well known with high incidence of gastric cancer and Helicobacter pylori infection. However, most studies to evaluate CagA and VacA phenotype in Korea have been performed in limited cases and have showed inconsistent results. Some of these differences may be explained by variation in methods, geographic factors and socioeconomic factors. We evaluated the prevalence of seropositivity to CagA and VacA in different disease entities by using a commercial Western blot kit (Helicoblot 2.0^(TM), Genelabs Diagnostics, Singapore). This kit allows rapid visualization of full serologic profiles of various antigens which belong to H. pylori and standardization for international cornparisons. Methods: For 117 consecutive patients (72 nonulcer dyspepsia, 23 gastric ulcers and 22 duodenal ulcers, histology, rapid urease test (CLO^(TM) Delta- West, Western Australia) and ELISA test (GAP^(TM) test, BIORAD, Millan, Italy) were performed. From each patient, serum was collected and western blot assay was performed. Patients are considered as H. pylori positive if two of above tests were positive. Results: CagA and VacA were positive in 88.5% and 50.0% of H. pylori infected patients. All the VacA positive patients expressed CagA positivity while only 56.5% of CagA positive patients showed VacA positivity. Reactivities to CagA and VacA were not significantly different according to different types of disease. Comparison of western blot assay with ELISA test showed decrease in specificity of both tests after the age of 50 (76.0% vs 42.9%, 80.0% vs 42.9% respectively, p$lt;0.05). Conclusions: Reactivity of the H. pylori positive sera to western blot assay differs according to disease entities. Serologic profiles to CagA and VacA show no significant association with peptic ulceration in Korean patients with H. pylori infection. In addition, the western blot assay shows poor and limited specificity in old patients.