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최원혁,박유정,홍일철,이한철,박세훈,최성철,이효락,정인경,정재훈,민용기,이명식,이문규,김광원,김원석 대한내분비학회 2001 Endocrinology and metabolism Vol.16 No.2
MEN1 is characterized by the combined occurrence of tumors of the parathyroids, pancreatic islet cells and the anterior pituitary. Pancreatic islet cell tumors occur in 40% of MEN1 patients. Pancreatic polypeptidomas occur most commonly but they are asymptomatic. Gastrinomas are the second most common type. VIPomas are rare and there has been no report of a case in Korea so far. We encountered a case of pancreatic VIPoma in MEN Type I. A 49 year old man was referred from his local hospital presenting with a sudden onset of an explosive watery diarrhea of 3 months duration. Abnormal findings in his blood chemistry were hypercalcemia and hypokalemia. The ^99mTc-sestamibi sintigraphy showed an increased uptake in right lower parathyroid gland. Abdominal CT demonstrated a mass of 6×4 ㎝ in tail of the pancreas and multiple lesions in both hepatic lobes. Serum levels of VIP hormones were elevated. Subtotal parathyroidectomy and subtotal pancreatectomy were done. Postoperatively his symptoms were improved transiently, however the patient showed repetitive attacks of watery diarrhea. So in order to palliate his symptoms, an RF ablation of the metastatic liver masses was performed. After that therapy his clinical symptoms were reduced dramatically. Unfortunately, the patients condition worsened again. Despite of continuous octreotide therapy, interferon and two courses of combination chemotherapy, the hepatic metastases failed to regress and the patient died 10 months after the diagnosis of a metastatic VIPoma. This is the first report of pancreatic VIPoma in MEN type I in Korea
Sputtering법으로 제조된 TaNx 박막의 제조조건에 따른 전기저항 변화
최용락,김선화,Choe, Yong-Rak,Kim, Seon-Hwa 한국재료학회 1997 한국재료학회지 Vol.7 No.12
현재 전기, 전자, 우주, 자동차, 무기 등의 여러 분야에서 응용되고 있는 TaNx 다층박막저항체의 특성을 개선하기 위하여 magnetron sputtering법으로 TaNx박막을 제조한 후, 온도와 질소분압에 따른 전기저항 및 TCR특성 변화를 조사하였고, 미세조직이 이들 전기적 성질에 미치는 영향을알아보기 위해 상분석과 morphology를 관찰하였다. 그 결과, TaNx을 코팅한 박막의 전기저항은 $N_{2}$Ar이 0.4 이상에서, 금속전도특성에서 이온전도특성으로 변화하였으며,Cr이 TCR효과를 안정시키는 역할은 하여 TaNx/A $I_{2}$ $O_{3}$보다 TaNx/Cr/A $i_{2}$ $O_{3}$박막의 TCR특성이 더 안정하게 나타났다. 또한 TaNx/A $I_{2}$ $O_{3}$박막과 TaNx/Cr/A $i_{2}$ $O_{3}$박막의 경우 모두 $N_{2}$/Ar이 0-0.4정도에서 TCR효과에 좋은 특성을 나타내었다. X-선회절 실험 결과 $N_{2}$/Ar비가 1일 경우에 T $a_{2}$ $N_{.8}$이 생성되었고, 분압이 증가함에 따라 비정질이 생성되었다. morphology가 $N_{2}$/Ar이 증가함에 따라 입자의 모양이 불연속아일랜드 형태로 변화하였으며, 이것은 질소분압에 따른 전기저항 변화와 일치하였다.다.
Anatase TiO$_2$박막의 미세조직이 광촉매 효과에 미치는 영향
최용락,김선화,Choe, Yong-Rak,Kim, Seon-Hwa 한국재료학회 2001 한국재료학회지 Vol.11 No.7
$TiO_2$광촉매릉 반응성 스퍼터링법을 이웅하여 박막으로 제조하고 유기물 및 살균실험을 통하여 미세조직이 광촉매 효율에 미치는 영향을 조사하고자 하였다. 광촉매 효율측정을 위하여 페놀분해실험 및 E.coli 078을 이용한 살균실험을 행하였다. $TiO_2$박막에 의한 페놀분해실험 시, 전자수용체인 산소의 공급에 의하여 분해효율이 2배까지 증가하였다. E.coli 078분해실험의 경우, 광촉매 $TiO_2$박막을 사웅하여 살균하였을때 UV만 조사하여 살균하였을 경우 보다 분해효율이 최고 70% 이상 증가하였다. 페놀분해실험과 E.coli 078 살균실험 결과 저결정성 박막의 경우 분해능이 매우 미약하였으며, 표면조도가 높고 결정성이 우수한 박막의 경우에 높은 광촉매 효율을 나타내어$TiO_2$박막의 광촉매 효과는 표면형상과 결정성이 매우 중요한 인자로 작용하였다. Anatase $TiO_2$thin films as a photocatalyst were prepared by the reactive magnetron sputtering process. The $TiO_2$thin films were deposited on Si substrates under the various conditions : oxygen partial pressure, working pressure, sputtering time, and D.C. power. The photocatalystic degradation of $TiO_2$thin film have been studied to examine the contribution of surface morphology and crystallinity. The thin films with a good crystallinity or a rough surface showed a high photocatalytic degradation rate on phenol and E.coli 078 experiment. Compared with that of only UV radiation, the photocatalytic efficiency of $TiO_2$thin film under the UV radiation and the $O_2$ flow increased. We found that the crystallity and the morphology were the important factors on the photocatalytic efficiency of TiO$_2$thin film.
원폭 피폭자와 그 자녀들에 대한 임상적 및 염색체 이상에 관한 연구
김동수,백용균,박상길,정정명,최하진,김상정,최원락 대한내과학회 1986 대한내과학회지 Vol.31 No.4
Presented in this paper is the data from clinical labaratory examination of 50 Korean atomic-bomb survivors (in Hiroshima and Nagasaki, Japan in 1945). Of them, 15 survivors were karyotyped from their lymphocyte culture for both $quot;stable$quot; and $quot;unstable$quot; types of chromosomal aberrations. Eight of their offspring could be tested for the chromosomal changes and SCE as well. The results were as follows: 1) All survivors were found to have suffered from various diseases, particularly from respiratory disease. Two had malignancies, viz., one case having squamous cell carcinoma of uterine cervix and another adenocarcinoma of stomach. 2) Serum total protein and serum albumin levels were found to be decreased in 18% and 27% of the survivors, respectively. Alkaline phosphatase, SGOT, IgG and IgM were increased in 22%, 6.3%, 36.7% and 13.6% of the survivors, respectively. IgA was within normal limit in all cases. 3) Stable type of chromosomal aberrations was discovered in none of the survivors and the offspring examined. However, approximately 50% of the survivors showed significantly higher incidence of chromatid breakage than normal controls. 4) None of the offspring showed the chromatid breakage, but 75% of them showed significantly higher rate of SCE when compared to controls.
최용락,고병수,박명찬,Choe, Yong-Rak,Ko, Byong-Su,Park, Meong-Chan 대전대학교 군사연구원 2003 군사학연구 Vol.1 No.-
While the social activities using Internet become generalized, the side effect of the information security violation is increasing steadily and threaten the countries which is not ready to prevent from offensive penetration such as the Information-fighter or Cyber-military. In this paper, we define the concept and characteristics of the modern Information-Warfare and analyze various kinds of threatened elements and also examine the recent trend in other countries. And introducing Computer Forensics raised recently for the confrontation against the security violation in the future, we will show the developing strategies and the necessity in order to response cyber attacks. These developing strategies can be used to ensure and re-trace the technical evidence for the security violation and to achieve the disaster relief effectively. So we hope that can apply them to the actual preparation through developing cyber trial test of the defense and attack for the Information-Warfare.
반응성 스퍼터링법으로 제조된 anatase TiO$_2$박막의 미세조직에 관한 연구
최용락,김선화,이건환,Choe, Yong-Rak,Kim, Seon-Hwa,Lee, Geon-Hwan 한국재료학회 2001 한국재료학회지 Vol.11 No.9
Anatase $TiO_2$ thin films as a photocatalyst were prepared by the D.C reactive magnetron sputtering process. The $TiO_2$ thin films were deposited on Si(100) substrates under the various conditions : oxygen partial pressure, working pressure, substrate temperature, D.C power, and deposition time. The morphology of the TiO$_2$ thin films showed an island structure. At early stages of film growth, amorphous phase formed. However, during the further growth, columnar crystalline $TiO_2$grains evolved. The crystallinity of the thin films depended on the oxygen partial pressure, the working pressure and the D.C. powers.