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CLASSIFICATION OF SPACES IN TERMS OF BOTH A DIGITIZATION AND A MARCUS WYSE TOPOLOGICAL STRUCTURE
한상언,Chun, Woo-jik 호남수학회 2011 호남수학학술지 Vol.33 No.4
In order to examine the possibility of some topological structures into the elds of network science, telecommunications related to the future internet and a digitization, the paper studies the Marcus Wyse topological structure. Further, this paper develops the notions of lattice based Marcus Wyse continuity and lattice based Marcus Wyse homeomorphism which can be used for studying spaces X ⊂ R^2 in the Marcus Wyse topological approach. By using these two notions, we can study and classify lattice based simple closed Marcus Wyse curves.
ARRANGEMENT OF ELEMENTS OF LOCALLY FINITE TOPOLOGICAL SPACES UP TO AN ALF-HOMEOMORPHISM
한상언,Chun, Woo-jik 호남수학회 2011 호남수학학술지 Vol.33 No.4
In relation to the classification of nite topological spaces the paper [17] studied various properties of nite topological spaces. Indeed, the study of future internet system can be very related to that of locally finite topological spaces with some order structures such as preorder, partial order, pretopology, Alexandroff topological structure and so forth. The paper generalizes the results from [17] so that the paper can enlarge topological and homotopic properties suggested in the category of nite topological spaces into those in the category of locally finite topological spaces including ALF spaces.
김우경,임재호,박승하,이근직,이종문,정전은 大韓成形外科學會 1993 Archives of Plastic Surgery Vol.20 No.5
Soft tissue defects of the hand overlying joints, tendons, neuro-vascular pedicle, and tactile surfaces require full thickness skin and subcutaneous tissue. The island flaps were performed successfully to reconstruct the soft tissue defects of the hands. We obtained following results. 1. From Jul. 1984 to Dec. 1992, we performed island flaps in 67 cases(neuro-vascular island flap in 21 cased, arterialized island flap in 5 cases, reverse island flap in 39 cases, neuro-vacular volar advancement flap in 2 cases), among which 41 cases were followed up for more than 36 months. 2. The survival of the flap was successful in all cases except on case of total necrosis in reverse island flap. The transfered flaps were good in durability and cosmesis. 3. Recovery of the protective sensation such as pain & touch were good. In 7.5% of the patient who received these procedures, 2 point discrimination distance was less than 15mm. 4. Only 3 of the 13 patients who received neuro-vascular island flap with follow-up ranging from 3 to 30 months acheived cortical reorientation. 5. The island flap procedure for the coverage of the soft tissue defect of the hand was a time-saving, one-stage operation. It was possible to transfer good quality skin together with its subcutaneous fibrous fatty padding. The patients who received these procedures had no uncomfortable immobilization of the hand.
오형직,박영섭,이상원,박춘근,백민우,김문찬,강준기,송진언 대한신경외과학회 1989 Journal of Korean neurosurgical society Vol.18 No.7-12
14 supratentorial and 6 infratentorial arachnoid cysts, diagnosed and treated at Kangnam St Mary's Hospital from 1983 to 1988, are reported. The most common presenting symptoms in children were craniomegaly, delayed development, increased ICP and neurlolgical focal signs. Neuroradiological examination included plain skull X-ray, brain CT and metrizamide CT or isotope study. Therpeutic criteria according to the clinical and radiological findings were reviewed. The results were as follows ; 1) The patient below age of 2 yrs who's brain had a potent ability of growth should be operated in any case for reducing mass effect. 2) In sylvian lesion, Type Ⅱ and Ⅲ according to the classification of Galassi were well treated with C-P snunt. 3) In infratentorial lesion, all patients had hydrocephalus and the patient who had communicated with subarachnoid space in metrizamide CT were well treated with V-P shunt and who not communicated with subarachnoid space was well treated with Y-shunt. 4) We had good results by fenestration above the age of 3 yrs and by C-P shunt under the age of 2 yrs in supratentorial lesion.
합성 가스 비예혼합화염의 소염 및 NO<SUB>x</SUB> 생성특성에 관한 수치해석적 연구
정훈직(Hun-Jik Chung),최상규(Sang-Kyu Choi),천강우(Kang-Woo Chun),정석호(Suk-Ho Chung) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
Flame structures, extinction characteristics, NOx emission characteristics of syngas-air nonpremixed flame, are numerically investigated. Extinction stretch rate, which is the indicator of flame stability, increase under the conditions of higher portion of H₂ in fuel, lower fuel dilution, higher initial temperature and pressure, except for the case of highly diluted fuel at high pressure. Maximum temperature and EINOx also increase in these conditions. EINOx decreases with stretch rate, but the decreasing rates are different between the cases of two diluents(N₂, CO₂), which were mainly resulted from the difference of NOx production rate. NOx production paths are illustrated by NO reaction path diagram. The increase of N radical results in much NOx production at high initial temperature and pressure. But at high pressure, third-body recombination reactions which consume NO offset NO production, the increasing rate of EINOx becomes smaller. Thermal NO mechanism is weakened in high dilution cases, and non-thermal mechanisms prevail. The combustion conditions, which can achieve higher extinction stretch rate have advantages of flame stability, but NOx emission can be pronounced in these conditions, suggesting that the selection of optimum operation range is needed in syngas combustion.