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- 저자 : Kwan Yong Sim (검색결과 41 건)
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김용식,심영택,이인범,이승관 대한금속재료학회(대한금속학회) 1984 대한금속·재료학회지 Vol.22 No.1
The Steel plant is composed of many sub-plants which perform their own processes and among these processes the batch processes related with the ingot process are very important with respect to the process optimization, for they generally determine the extent of the realization of the process optimization. In this research the mathematical model for the prediction of the soaking of the which optimizes the ingot process of the 2nd Blooming and Stabbing Mill Plant of the POSCO is developed. This article deals the development of the simultion model for the 2nd Blooming and Stabbing Mill Plant of the POSCO. The energy saving more than 10% is shown to be realized by applying the above simulation model manually. Therefore the process optimization of the 2nd Blooming and Stabbing Plant of the POSCO is anticipated by the computerization of the above plant which is now undergoing.
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임신중독증 환자의 혈청 철 및 총철결합능 농도에 관한 임상적 연구
김용봉,김태형,심의섭,이응수,박성관 인제대학교 1993 仁濟醫學 Vol.14 No.3
임신중독증환자에서 혈청 철 및 총철결합능의 농도를 측정하고 정상임부의 그것과 비교 관찰함으로서 임신중독증의 조기진단에 대한 임상적 적응가치를 평가하고저 본 연구를 시행하였다. Preeclampsia is one of the most common causes of maternal mortality, but the etiological factor is still obscure. And so, clinical parameters for predicting this desease have been required because early diagnosis of this disease is important. In order to evaluate clinical application, serum iron concentration and serum total iron binding capacity were studied in groups of women suffered from mild and severe preeclampsia, and compared with normal pregnant controls. The results were as follows : 1.The mean serum iron concentration of preeclampsia group and normal pregnant controls was 114.3±80.2㎍/dl and 64.3±18.9㎍/dl respectively. The concentration of preeclampsia group was higher than that of normal pregnant controls significantly. 2.The mean serum iron concentration of mild and severe preeclampsia groups was 90.2±29.8㎍/dl, and 128.3±96.5㎍/dl respecrively The concentration of severe preeclampsia group was higher than that of mild preeclampsia significantly. 3.There was no significant difference in the serum total iron binding capacity between preeclampsia group and normal pregnant controls. This findings suggest that increased serum iron concentration is crucial in the early detection of preeclampsia.
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Cho, Yong-Chan,Sim, Hyung Seok,Jung, Songhie,Kim, Han-Gyeoul,Kim, Jun-Soo,Bae, Kwan-Ho The Ecological Society of Korea 2020 Journal of Ecology and Environment Vol.44 No.4
Background: The stem exclusion stage is a stage of forest development that is important for understanding the subsequent understory reinitiation stage and maturation stage during which horizontal heterogeneity is formed. Over the past 11 years (2009-2019), we observed a deciduous broad-leaved forest in the Albongbunji Basin in Ulleungdo, South Korea in its stem exclusion stage, where Fagus engleriana (Engler's beech) is the dominant species, thereby analyzing the changes in the structure (density and size distributions), function (biomass and species richness), and demographics. Results: The mean stem density data presented a bell-shaped curve with initially increasing, peaking, and subsequently decreasing trends in stem density over time, and the mean biomass data showed a sigmoidal pattern indicating that the rate of biomass accumulation slowed over time. Changes in the density and biomass of Fagus engleriana showed a similar trend to the changes in density and biomass at the community level, which is indicative of the strong influence of this species on the changing patterns of forest structure and function. Around 2015, a shift between recruitment and mortality rates was observed. Deterministic processes were the predominant cause of tree mortality in our study; however, soil deposition that began in 2017 in some of the quadrats resulted in an increase in the contribution of stochastic processes (15% in 2019) to tree mortality. The development of horizontal heterogeneity was observed in forest gaps. Conclusions: Our observations showed a dramatic shift between the recruitment and mortality rates in the stem exclusion stage, and that disturbance increases the uncertainty in forest development increases. The minor changes in species composition are likely linked to regional species pool and the limited role of the life-history strategy of species such as shade tolerance and habitat affinity. Our midterm records of ecological succession exhibited detailed demographic dynamics and contributed to the improvement of an ecological perspective in the stem exclusion stage.
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Consideration of Diluents Selection and Input Amounts of the Hunter Process for Tantalum Production
Jae‑Jin Sim,Sang‑Hoon Choi,Yong‑Kwan Lee,Sung Gue Heo,Taek‑Soo Kim,Seok‑Jun Seo,Kyoung‑Tae Park 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7
Tantalum (Ta) is a heavy refractory metal with an atomic weight of 180.95 g/mol, a density of 16.6 g/cm3, and a high meltingpoint of 3017 °C. With its refractory characteristics, it shows excellent chemical and physical stability as well as corrosionand heat resistance at elevated temperatures. The demand for Ta metal and related compounds is increasing with the expansionof the electronics and chemical industries. The Hunter process was proven to be effective in producing Ta powder in1953. Hunter proposed a method in which potassium heptafluorotantalate (K2TaF7) was reduced by sodium (Na). Thus far,this process has been the primary commercial method to produce Ta powder. In this study, quantitative differences wereanalyzed for diluent selection. Additionally, consideration was given to changes in the caloric value depending on the inputamount of diluents. Finally, the optimum material input and the properties of the prepared Ta were analyzed. Stoichiometricratios of K2TaF7(1 mol), NaCl (6.2–6.7 mol), Na (5–7 mol) were weighed, to perform a metallothermic reduction reaction. After the reaction, the tantalum powder was recovered and the flush process was carried out. After that, it was dried in avacuum atmosphere. Physical properties such as oxygen concentration, PSA, ICP-OES, and XRD of powder were conductedto evaluate the characteristics of Ta powder that was finally manufactured.
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정해관,이민석,이현경,임문환,김용탁,이성우,임현술,황선보,오연희,배철성,심재철,김승현,도은형,윤혜원 東國大學校醫學硏究所 1995 東國醫學 Vol.3 No.-
동국대학교 의료원 산부인과에서는 1991년 10월 1일부터 1994년 12월 31일까지 약 39개월동안 자궁외 임신으로 진단된 79명의 환자에게 골반경 수술을 시행하였다. 골반경수술은 수술후 입원기간의 단축, 개복으로 인한 불필요한 출혈의 방지 및 수술시간의 단축, 수술후 유착감소 및 반복수술의 용이성, 미용상의 효과가 좋았다. 특히 비파열성 자궁외 임신에서 골반경을 이용한 난관개구술과 MTX 국소투여법 같은 보존적 치료는 매우 효과적이었다. 그리고 난관파열이 되어 어느정도 복강내출혈이 있는 파열성 자궁외 임신에서도 골반경수술의 장점을 살리면서 시술을 할 수 있을 것으로 생각된다. Prevalence of extrauterine pregnancy has increased. With the availability of the rapid quantitative B human chorionic gonadotropin titers and more accurate sonograms, the diagnosis of probable extrauterine pregnancy is being made earlier and often before tubal rupture. Salpingectomy at the time of laparotomy has been the standard treatment for tubal pregnancy, even when the tube was not ruptured. Recently conservative surgery via salpingotomy/salpingostomy or fimbrial expression has been advocated. The pelviscopy is an essential tool in making the diagnosis and, given certain criteria, can be useful for management as well. Pelviscopic management of extrauterine pregnancy has been described extensively in last several years. These methods have been associated with low morbidity, early recovery, and short hospital stay. Although the role of medical therapy for extrauterine pregnancy is still uncertain, medical therapy of early, unruptured extrauterine pregnancy can be safe and cost effective and even result in improved fertility, compared with the standard surgical therapy. Conservative treatment of unruptured type tubal pregnancy, which have been diagnosed early, salpingotomy and salpingostomy and MTX local injection are highly effective. We have experienced 80 cases of pelviscopic surgery in 79 patients with extrauterine pregnancy. Among the procedures, salpingectomy was peformed most frequently(78.5%). Salpingotomy was also performed(12.5%), salpingectomy was performed(1.3%), pelviscopy guided MTX local injection was performed(1.3%), and fimbrial expression was performed(1.3%). Of 79 patients, complication occurred in 7 patients. In one patient with liner salpingotomy, additional pelviscopic salpingectomy was needed for bleeding control from previous salpingotomy sites. Hospital stay was averaged 3.8 days. Pelviscopic treatment of extrauterine pregnancy was simple and effective with fast recovery even in patients with pelvic adhesions due to prior operations, ruptured extrauterine pregnancies with moderate intraperitoneal free blood.
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기능성 위장관 질환의 증상에 대한 Clebopride의 치료효과
이남심,안관용,안득수 전북대학교 의과학연구소 1985 全北醫大論文集 Vol.9 No.3
To evaluate the effect of clebopride on the symptoms of various functional G-Ⅰ disease, we observed improvement of the individual clinical symptoms and the side effects after administration of the drug in the 43 cases of patients with gastric ptosis, chronic gastritis, cascade stomach, iriitable bowel syndrome and alimentary tract neurosis, etc. in the department of Internal Medicine of Chonbuk National University Hospital from Mar. 1984 to Aug. 1984. Gastric empting times(G.E.T.'s, T½) of solid phase and serum gastrin levels were also measured with radioisotope(^99^mTc) and radioimmunoassay. The results were as follows ; 1) In the 43 cases of functional G-Ⅰ tract disease, symptomatic improvement were observed in cascade stomach(70%), chronic gastritis(65%), gastric ptosis(60%). 2) The G.E.T.(T½) of the solid phase measured by using the ^99^mTc isotope were within normal range(77.1sec) in 8 cases. There was no significant difference in the improvement of the symptoms between these 8 cases and normal control. 3) In thr group of the patients with severs synptoms in association with low gastrin levels, good to symtomatic improvement were observed in 85.3% effect. 4) Individual symptoms improved by the administratio of the drug included epigastric fullness and discomfort, indigestion, nausea, hunger pain, hypertonia and substernal discomfor. 5) Side effects of the drug observed were not specific, but drowsy, lassitude, mild headache, reappearance of pre-existing symptoms after withdrawal of the drug were observed.
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