천이금속 표면에서의 수소의 동력학 : 수소의 화학 흡착, 방출, 확산에 관하여

손기수,박동수,최상돈,김석환,김영주 慶北大學校 物理化學硏究所 1986 硏究論文集 Vol.7 No.-

S.M. Ko, L.D. Schmidt 등에 의하여 제시된 표면의 bulk내의 원자, 진공 근처 표면에서의 분자의 존재, 그리고 T. Engel, U. Kuipers 등에 의해서 제시된 진공과 bulk 사이에서의 분자와 원자간의 상호 변환 가설을 합쳐 진공과 접한 표면의 단 원자층에 화학흡수층을 설정하여 새로운 model을 만들었고, 이 model에 의하여 표면과 bulk 및 진공 사이에 일어나는 모든 과정 즉 표면과 bulk 사이의 difussion과 adsorption, 화학 흡수층에서 분자가 dissociation 과정을 거쳐 표면에 adsorption 되거나, recombination 과정을 거쳐 분자로 desorption 하는 과정등을 모두 설명할 수 있는 결과를 얻었다. 나아가서 평형 상태하의 표면 fraction과 화학 흡수층내의 분자의 시간분포, desorption하는 분자들의 시간 분포함수를 얻었다. 온도에 대해 peak amplitude와 log(θ/1-θ)의 값을 얻어서 실험치와 비교했으며, 수소원자의 desorption fraction을 얻었다. Proposing a new model which includes two states model and chemisorption layer right above the surface atomic layer which interrelates the atoms in bulk and the molecules in vacuum, the diffusion from the surface to bulk, adsorption on surface from chemisorption layer and desorption from chemisorption layer are explained. We also get the distribution of molecules versus time at the chemisorption layer, log(θ/1-θ), and atomic peak amplitude on surface versus the reciprocal temperature on equilibrium condition. These results are turned out to be good results. Furthermore by the use of above results, we derive the desorbing fraction as a linear function of inverse temperature.

천이금속 표면에서의 수소 흡입의 동력학 : 수소흡착, 방출과 확산에 관하여

손기수,박동수,최상돈,김석환,배준규 慶北大學校 物理化學硏究所 1986 硏究論文集 Vol.7 No.-

천이금속(Nb) 표면에 수소의 두 상태는 R.J. Smith에 의해 암시되어 왔다. 우리는 이것을 받아들여 천이금속 표면에 두 개의 상태를 가정하여 몇 개의 경우의 potential barrier에 관해 charging과 degassing 조건하에서 수소원자의 fraction의 시간에 대한 변화율을 얻었다. 그리고 수소의 표면 fraction θ에 대해 온도와 log(θ/1-θ)의 비와 peak amplitude를 구하여 R.J. Smith팀의 실험결과와 비교했으며 그것을 이용해서 온도에 관한 desorption rate를 얻었다. It was known by R.J. Smith that there are two kinds of surface states on transition metal(Nb) surfaces. Furthermore for all metals desorption energy is larger than the solution energy. Here we present a model for hydrogen absorption of metal surfaces and then obtained the time rates of hydrogen charging and degassing on metal surfaces for few limiting cases. We also get log(θ/1-θ) versus the reciprocal temperature and peak amplitude of surface fraction versus the temperature, turned out to be good agreement with experiments. Finally we get the desorption fraction of hydrogen atom.

단결정 Si(111) 위에 형성된 Ti-실리사이드에 대한 RBS 및 XRD 분석

이중환,권오준,최치규,박동수,김건호,이상환,이의완,곽호원 濟州大學校 基礎科學硏究所 1991 基礎科學硏究 Vol.4 No.1

초고진공 상태에서 p형 Si(111)기판에 Ti을 증착한 후 고진공에서 열처리하여 Ti-실리사이드를 형성시켰으며, Ti-실리사이드의 상전이 및 형성운동학은 2 MeV⁴He? 이온 후방산란과 x-선 회절방법으로 규명하였다. 형성된 TiSi₂는 결정학적으로 C49(ZrSi₂)와 C54 구조의 두 종류로 확인되었다. C49 TiSi₂상은 열처리온도가 700℃이하의 저온에서 형성되었고, 700℃ 이상의 고온에서는 C54 TiSi₂상으로 나타났다. 본 연구에서 확인된 C54 TiSi₂전이온도(??)는 700℃ 였고, TiSi₂형성온도 영역내에서 TiSi₂ 층두께(χ)와 열처리시간(t)의 관계는 저온(700℃ 이하)일 경우 ??이고, 고온(750℃ 이상)에서는 χ=ct+d 의 관계식이 만족됨을 알 수 있었다. 이것은 700℃ 이하에서 TiSi₂ 형성기구가 Si 확산에 의해 제어되며, 750℃ 이상에서는 핵형성 제어에 의하여 계면반응하는 것으로 나타났다. Titanium silicides were prepared by depositing titanium film on p-type Si(111) followed by annealing in ultra high vacuum. The growth kinetics of Ti-silicide has been studied by using ion backscattering spectrometry and x-ray diffractometry. Two crystallographic structures of Ti-silicide were identified the (ZrSi₂)structure and C54. The C49 TiSi₂ phase was formed at low annealing temperature(<700℃),and it transformed to the C54 phase over 700℃. The relation between the thickness of TiSi₂ layer(χ) and the annealing time(t) was ?? when annealing temperature was under 700℃ and χ=ct+d when that was over 750℃. The former implied that the formation of TiSi₂ was controlled by diffusion and the latter by nucleation of at the Ti/Si(111) interface.

TEMPERATURE DEPENDENCE OF CYCLOTRON RESONANCE LINESHAPE FOR A QUASI 2-DIMENSIONAL PIEZOELECTRIC POLARON SYSTEM : 半導體 表面特性에 關한 硏究 (Ⅱ)

Park, Tong-Soo,Sohn, Ki-Soo,Choi, Sang-Don 慶北大學校 物理化學硏究所 1982 硏究論文集 Vol.3 No.-

The temperature dependence of cyclotron resonance lineshape (CRLS) for a quasi 2-dimensional piezoelectric polaron system is obtained on the basis of the linear response theory and the proper connected diagram method. The CRLS is Lorentzian in the moderate quantum limit. The linewidth increases with the temperature, which is very similar in feature to the case of deformation potential polaron system.

S-545 Risk predictive factors and prevalence of comorbid malignancies in patients with CML

( Tong-yoon Kim ),( Sung-eun Lee ),( Soo-hyun Kim ),( Soo-young Choi ),( Eun-jung Jang ),( Dong-wook Kim ) 대한내과학회 2016 대한내과학회 추계학술대회 Vol.2016 No.1

Introduction: As chronic myeloid leukemia (CML) patents are generally diagnosed at old age and live longer by active use of BCR-ABL1 tyrosine kinase inhibitors (TKIs), the occurrence of other malignancy (OM) is becoming a critical issue as a long-term comorbidity. we reviewed medical records of CML patients and compared with those of age-matched Korean population.Methods: The medical records of 1,469 CML patients who diagnosed between January 2000 and December 2014 were reviewed using Korean data of Asia CML Registry.With a cut-off date of July 2016, age-standardized prevalence rates (A-SPR) of OM (except benign tumors and other leukemias) were analyzed and compared with that of general population in Korea Central Cancer Registry (KCCR). In addition, we analyzed cumulative incidence rate of OM and various risk factors. Results: The median duration of follow-up was 84 (1-197) months, and 96 CML patients had at least one OM. Forty three patients had a history of OM before a median 69 (1-161) months of CML diagnosis and 53 patients developed OM after a median 53 (range; 0.2-172) months of CML diagnosis. A-SPR of OM was 1.7 times higher in CML patients. HL(8.7 times), thyroid ca.(2.6 times), biliary ca.(2.6 times), colorectal ca.(2 times), NHL(1.8 times),cervical cancer (1.8 times), and breast cancer (1.6 times) had a higher A-SPR. With 53 patients who had OM after CML diagnosis, we analyzed the cumulative incidence. Univariate analysis revealed that patients who were more than 37 years old at CML diagnosis(4.3%vs.0.4%, p<0.001) and who had family history of cancer(8.2%vs.2.3%, p=0.002) were associated with a higher OM. Multivariate analysis showed that older age (HR of 4.19, p<0.001) and family history (HR of 3.17, p=0.001) were independently associated with increased risk. There was no difference in 7-year OS between patients with OM (n=96) and without OM (n=1,373) (84.9% vs. 86.9%, p=0.573). However advanced cancer stages (stage 3 and 4) of OM significantly affected poor OS (88.3% vs.65.6% p=0.0406). Conclusions: Although comorbid malignancies did not significantly affect CML survival, poor survival in advanced stages and the high risk of other cancers warn the need of systematic screening in long-term CML survivors

혈관 외벽 지주 술식을 이용한 Nutcracker 증후군 치험 1예

최창식,조홍래,배상훈,배수동,채동완,서귀숙 대한혈관외과학회 1993 Vascular Specialist International Vol.9 No.1

Compression of the left renal vein(LRV) between the superior mesenteric artery and the aorta has been termed the nutcracker syndrome. This syndrome may be often asymptomatic but result in varicocele, flank pain and hematuria. We present here a case of the nutcracker syndrome in a l8-year old, thin, tall male student diagnosed by renal vein angiogram and MRI, who had a symptom of reddish urine and flank pain during 6 months. At operation, compression of the LRV was corrected with an external stent of reinforced PTFE, that was mentioned by R.W. Barnes in 1988. The gross hematuria was ceased on 6 hours after operation. The release of the compression was conformed by renal venogram and MRI on the 8th postoperative day. So we would agree with R.W.Barnes et al's recommandation that this external stenting procedure was a more simple and physiologic therapy than previous approaches including nephrectomy, variceal ligation, nephropexy, or renocaval reimplantation. Besides, we found MRI, with its capability of imaging in sagittal planes, to be very helpful to identify a pathologic abnormality of the superior mesenteric artery as the cause of the nutcracker syndrome.

The Effect of Post-Treatment N-Acetylcysteine in LPS-Induced Acute Lung Injury of Rats

Choi, Jae Sung,Lee, Ho Sung,Seo, Ki Hyun,Na, Ju Ock,Kim, Yong Hoon,Uh, Soo Taek,Park, Choon Sik,Oh, Mee Hye,Lee, Sang Han,Kim, Young Tong The Korean Academy of Tuberculosis and Respiratory 2012 Tuberculosis and Respiratory Diseases Vol.73 No.1

Background: Oxidation plays an important role in acute lung injury. This study was conducted in order to elucidate the effect of repetitive post-treatment of N-acetylcysteine (NAC) in lipopolysaccaride (LPS)-induced acute lung injury (ALI) of rats. Methods: Six-week-old male Sprague-Dawley rats were divided into 4 groups. LPS (Escherichia coli 5 mg/kg) was administered intravenously via the tail vein. NAC (20 mg/kg) was injected intraperitoneally 3, 6, and 12 hours after LPS injection. Broncho-alveolar lavage fluid (BALF) and lung tissues were obtained to evaluate the ALI at 24 hours after LPS injection. The concentration of tumor necrosis factor ${\alpha}$ (TNF-${\alpha}$) and interleukin $1{\beta}$ (IL-$1{\beta}$) were measured in BALF. Nuclear factor ${\kappa}B$ (NF-${\kappa}B$), lipid peroxidation (LPO), and myeloperoxidase (MPO) were measured using lung tissues. Micro-computed tomography (micro-CT) images were examined in each group at 72 hours apart from the main experiments in order to observe the delayed effects of NAC. Results: TNF-${\alpha}$ and IL-$1{\beta}$ concentration in BALF were not different between LPS and NAC treatment groups. The concentration of LPO in NAC treatment group was significantly lower than that of LPS group ($5.5{\pm}2.8$ nmol/mL vs. $16.5{\pm}1.6$ nmol/mL) (p=0.001). The activity of MPO in NAC treatment group was significantly lower than that of LPS group ($6.4{\pm}1.8$ unit/g vs. $11.2{\pm}6.3$ unit/g, tissue) (p<0.048). The concentration of NF-${\kappa}B$ in NAC treatment group was significantly lower than that of LPS group ($0.3{\pm}0.1\;ng/{\mu}L$ vs. $0.4{\pm}0.2\;ng/{\mu}L$) (p=0.0001). Micro-CT showed less extent of lung injury in NAC treatment than LPS group. Conclusion: After induction of ALI with lipopolysaccharide, the therapeutic administration of NAC partially attenuated the extent of ALI through the inhibition of NF-${\kappa}B$ activation.

Temperature Dependence of the Cyclotron Resonance Lineshape for a Quasi 2-Dimensional Piezoelectric Polaron System

Choi, Sang-Don,Sohn, Ki-Soo,Park, Tong-Soo 慶北大學校 物理化學硏究所 1984 硏究論文集 Vol.5 No.-

준 2차원 압전 폴라론계에 대한 사이클로트론공명흡수선이 적당한 양자조건에서는 Lorentzian꼴이고 그 반폭은 온도에 따라 증가함을 이론적으로 규명했다. The temperature dependence of the cyclotron resonance lineshape(CRLS) for a quasi 2-dimensional piezoelectric polaron system is obtained on the basis of the linear response theory and the proper connected diagram expansion method. The CRLS is Lorentzian in the moderate quantum limit. The linewidth increases with the temperature, a feature very similar to the case of the deformation potential polarn system.

Caroli 질환에 대한 마취 1 예 보고

김동수,이명희,최영룡,신광일,강호근 대한마취과학회 1979 Korean Journal of Anesthesiology Vol.12 No.3

Caroli's disease is associated with the combination of congenital dilation of the intrahepatic bile ducts, polycystic disease of the kidney and congenital hepatic fibrosis. The disease entity was first reported by Caroli and associates(1958) and was extensively reviewed in a monograph by Caroli and Corcos (1964). The original first description of Carolis disease is characterized by congenital saccular dilation of the intrahepatic bile ducts, a high incidence of stone formation and cholangitis, absence of hepatic fibrosis and portal hypertension but associated with renal tubular ectasia or other forms of cystic disease of the kidneys, possibly of the pancreas. However the pure form, as described above, has been uncommon. We have experience with a case of general anesthesia for a 12 year old female patient who had Caroli's disease, which was confirmed preoperatively by computerized tomography in Kyoung Hee Medical Center. As the Caroli's disease may involve hypofunction of the liver and kidney, anesthetics with less aetion on the liver and kidney are-preferable. This patient was premedicated with atropine and meperidine. Anesthesia was induced with thiopental and succinylcholine for intubation, then maintained with N₂O-O₂pancuronium and meperidine. The anesthetic and immediate postoperative course was uneventful, but the patient expired with expected cardiac arrest one week later.

제7차 지방의원선거분석과 지방선거제도의 개혁방안

최봉기(Choi Bong-Ki),이동수(Lee Tong-Soo) 한국지방자치학회 2003 韓國地方自治學會報 Vol.15 No.2

The 7th Korean Local Election of June 13. 2002 caused a lots of problems. but few scholars or researchers brought these electoral problems to academic plaza for intensive discussion or problem solving purpose. In this regard, this study is aimed at an analysis the problems generated during the 7th korean local election. Nevertheless, this research was to great extent forced to narrow and limit the scope and object, because they were so wide in terms of scope and so diverse with its object : concentrating on the process and output of election for local councilor. Major election problems found in this study could be summarized as follows. ⅰ) The lowest voting rate. ⅱ) Excessive intervention of political parties on local election process. ⅲ) Distorted election campaigns concentrated on candidates for local chief executive positions. ⅳ) Increasing number of the return without voting. ⅴ) Serious ineffectiveness in candidate nomination system of the political parties. ⅵ) poor qualifications and academic backgrounds of local councilors. The results of this research suggest the following recommendations for the central government in order to improve and innovate local election system in Korea. ⅰ) Separation local councilor election from existing local election system ⅱ) Change a existing small electoral districts to medium and large ones. ⅲ) Abolition to candidate nomination system of political parties and restrictions on party intervention in local electoral processes. ⅳ) Adoption of incentive system and candidate screening system in local election to attract qualified candidates. ⅴ) Introduction of complete public management system on local election and adoption of approval voting system i. e., pros and cons, incase of single candidates. ⅵ) Introduction of viable supporting system to increase the number of woman councilors.