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안기석,여환욱,이경원,이순보,박종윤 성균관대학교 기초과학연구소 1993 論文集 Vol.44 No.1
Si(111)7×7 위에 Mg을 흡착시켜 표면 구조의 변화를 RHEED(Reflection High Energy electron Diffraction)와 XPS(X-ray Photoelectron Spectroscopy)를 이용하여 연구하였다. RT∼200℃까지의 기판온도에서 증착량의 증가에 따라 표면구조는 7×7에서 diffused 1×1, 그리고 2√3/3×2√3/3-R30° 구조로 변화하였다. 이를 thermal annealing하여 3-Domain 3×1 구조를 관측하였고, 이 결과는 J. Quinn등의 결과와 일치함을 알 수 있다. 또한, 기판온도를 증가시킴에 따라 diffuse 1×1, Single domain 3×1구조(450℃)에 대하여 Mg(KLL)/Si(2p) peak intensity ratio를 증착량 증가에 따라 측정하여 각기 다른 온도에서의 Mg 흡착에 대한 mechanism을 제시하였다. Change of the Si(111)7×7 surface structure upon Mg adsorption was studied by RHEED(Reflection HI호 Energy Electron Diffraction) and XPS(X-ray Photoelectron Spectrocopy). The RHEED patterns of Si(111)7×7 were changed to the diffuse 1×1 and 2√3/3×2√3/3-R30° patterns with increasing the deposition times of Mg at RT. The diffuse 1×1, 3-domain, and single domain 3×1 structures appeared successively at the adsorption temperature of 300, 350 and 450℃, respectively. We could find the relative coverages of these structures by measuring Mg(KLL)/Si2p XPS intensity ratio.
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PES를 이용한 Mg/Si(111)계의 초기 성장모드 연구
안기석,박래준,김정선,박종윤 성균관대학교 기초과학연구소 1993 論文集 Vol.44 No.2
LEED와 PES를 이용하여 Si(111)7×7 표면위에 흡착된 Mg의 초기 성장모드를 연구하였다. 상온∼200℃의 기판온도에서 흡착초기에서부터 Mg silicide의 형성을 관측할 수 있었고 이 구조는 최종적으로 2/3√3×2/3√3 R30° 구조의 LEED pattern을 가진 epitaxial silicide로 완성되었다. 계속된 Mg의 흡착은 이 silicide 위로 Mg bulk가 무질서하게 성장됨을 보여준다. 또한 300, 450℃의 기판온도에서는 각각 1×1 그리고 3×1 구조가 관측되었다. The initial growing mode of Mg adsorbed on Si(111)7×7 surface has been studied by low energy electron diffraction (LEED) and photoelectron spectroscopy(PES). With increasing deposition time, the LEED pattern was changed to diffuse 7×7, diffuse 1×1 and 2/3√3×2/3√3 R30° structures at room temperature, successively. Also, we observed the 1×1 and 3×1 patterns at 300 and 450℃, respectively. From the Leed and PES results, it has been found that a Mg silicide is formed at the initial adsorption stage and that the 2/3√3×2/3√3 R30° structure is responsible for the thin epitaxial Mg silicide at RT∼200℃.
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Si(111)$7{\times}7$ 표면에서 Mg 성장양상 연구
안기석,여환욱,이경원,이순보,조용국,박종윤 한국진공학회 1993 Applied Science and Convergence Technology Vol.2 No.4
Si(111)7 $\times$ 7 위에 Mg를 흡착시켜 표면구조의 변화를 RHEED(Reflection High Energy Electron diffraction) 와 XPS(X-ray PhotoelectronSpectroscopy)를 이용하여 연구하였다. RT ~20$0^{\circ}C$까지의 기판온도에서 증착량의 증가에 따라 표면구조는 (7$\times$7)에서 diffused (1$\times$1) 그리고 (2 3 3 $\times$2√3√3-R30$^{\circ}$) 구조로 변화하였다. 또한, 기판온도를 증가시킴에 따라 (1$\times$1), three domain(3$\times$1) 등의 구조를 볼 수 있었고, 특히 , $450^{\circ}C$의 기판온도에서는 single domain (3$\times$1) 구조를 최초로 관측하였다. 이렇게 형성된 각 구조에 대한 Mg KLL과 Si2p의 XPS peak intensity ratio를 증착량의 증가에 따라 측정하여 각기 다른 온도에서의 Mg 성장에 대한 메카니즘을 제시하였다.
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안기석,김지운,박찬웅,김기중,김건형,최요안,민귀환,정준성 대한소화기내시경학회 1997 Clinical Endoscopy Vol.17 No.3
Foreign bodies in the stomach are usually ingested by children under 5 years of age, persons with dentures, alcoholics, mentally disturbed individuals or prisoners with a purpose of secondary gain. Many patients will be asymptomatic and will be brought in by parents with a history of having swallowed something. The ingested foreign bodies are mainly coins, particles of metals, fish bones and etc. A needle or a toothpick in the stomach has been rarely reported in an adult.. We present two cases of patients: one case of patient with needle stuck in the stomach, who swallowed for the purpose of secondary gain, and the other case of patient with toothpick stuck in the stomach, who did not realize having swallowed it. A 23-year-old man, prisoner, was admitted to hospital due to epigastric pain after ingestion of a needle. Endoscopy showed a black needle, 1.2cm long stuck at the prepyloric antrum. It was removed by the endoscopic biopsy forceps through the overtube used in endoscopic variceal ligation and proved to be a needle with a length of 4.9 cm and a diameter of 0.1 cm. A 58-year-old woman developed an acute onset of hematemesis and epigastralgia, and presented to the emergency room. On admission, her blood pressure was 60/40 mmHg. An emergency endoscopy showed a yellowish, thin, stiff material 3.5cm long stuck at the greater curvature of the antrum with meat materials. It was removed by the above method and proved to an wooden tooth pick with a length of 6.5 cm and a diameter of 0.2 cm. No active bleeding was noted from the removed site. She did not realized she had swallowed the toothpick. She was discharged without complication.
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내시경적 결찰요법으로 치유한 Dieulafoy 궤양 2예
안기석,박찬웅,김기중,민귀환,윤태용,정준성,김영용,이진웅,최관수 대한소화기내시경학회 1998 Clinical Endoscopy Vol.18 No.2
A dieulafoy ulcer is rarely recognized but is not an uncommon cause of massive, recurrent and frequently fatal gastrointestinal bleeding resulting from the erosion of an unusually large submucosal artery. Although the lesion has been predominantly found in the proximal stomach, it has also been detected throughout the gastrointestinal tract. Diagnosis can be made by observation of protruding and eroded arteries with pulsatile bleeding, or through detection of an adherent thrombus using an endoscopy. In the past, surgical intervention was believed to be the best treatment, but currently, therapeutic endoscopy is more favored, due to its recent success in achieving permanent hemostasis. We experienced 2 cases of Dieulafoy's ulcer of the stomach. Endoscopic ligations using an O ring were performed successfully.
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안기석(Ki-Seok An),여환욱(Hwan-Wook Yeo),이경원(Kyung-Won Lee),이순보(Soon-Bo Lee),조용국(Yong-Kook Joh),박종윤(Chong-Yun Park) 한국진공학회(ASCT) 1993 Applied Science and Convergence Technology Vol.2 No.4
Si(111)7×7 위에 Mg를 흡착시켜 표면구조의 변화를 RHEED(Reflection High Energy Electron Diffraction)와 XPS(X-ray Photoelectron Spectroscopy)를 이용하여 연구하였다. RT~200℃까지의 기판온도에서 증착량의 증가에 따라 표면구조는(7×7)에서 diffused (1×1) 그리고 (2√3/3×2√3/3-R30°) 구조로 변화하였다. 또한, 기판온도를 증가시킴에 따라 (1×1), three domain (3×1) 등의 구조를 볼 수 있었고, 특히, 450℃의 기판온도에서는 single domain (3×1) 구조를 최초로 관측하였다. 이렇게 형성된 각 구조에 대한 Mg KLL과 Si2p의 XPS peak intensity ratio를 증착량의 증가에 따라 측정하여 각기 다른 온도에서의 Mg 성장에 대한 메카니즘을 제시하였다. Changes of the Si(111)7×7 surface structure upon Mg adsorption have been studied by RHEED (Reflection High Energy Electron Diffraction) and XPS (X-ray Photoelectron Spectrocopy). The RHEED pattern of Si(111)7×7 is changed to the diffused (1×1) and(2√3/3×2√3/3-R30°) patterns with increasing deposition time of Mg at room temperature. The three domain (3×1) structure appear at the adsorption temperature of 350℃. In particular, we first observed (1×1) and single domain (3×1) structures at adsorption temperature of 300, 450℃, respectively. From these results and measuring Mg KLL/Si2p XPS peak intensity ratio, we would expect that the relative coverages of Mg on Mg-induced (3×1) and (1×1) structure are to be 1/3 and 1 ML, respectively.
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