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金炯祐,徐城鐸,全燾基 中央醫學社 1973 中央醫學 Vol.25 No.2
In order to know the current status of sensitivity of urinary and enteric pathogens including pathogenic vibrios to some antimicrobial agents of current use, the sensitivity of these organisms isolated in recent years from. pathological sources except most of Vibrio parahaemolyticus which were isolated from marine sources) was studied by the agar plate dilution method. The antimicrobial agents tested were kanamycin (Kan), gentamicin (Gen), penicillin G (Pen), ampicillin (Amp), neomycin (Neo), oxytetracycline (0-Tet), minocycline (Min), doxycycline (Dox), furilin (Fur), streptomycin (Str), chloramphenicol (Chl), erythromycin (Ery), colistin (Col), carbenicillin (Carb), polymyxin .B (PxB), trimethoprim (TMP), sulfamethoxazole (SMX) and the mixture of TMP-SMX. Urinary isolates was classified into two major species, staphylococci and Escherichia coli, and the others were enteric gram negative bacilli and gram positive. cocci. These organisms were sensitive to Gen but resistant to most of antimicrobial agents of current use. They were especially resistant to Str, Kan, Pen, Amp, Chlr O-Tet, TMP-SMX and Col. Salmonella was strongly sensitive to Kan and moderately sensitive to drugs other than TMP-SMX, Ery and Col. Shigella was strongly sensitive to Kan, Gen and Amp, but highly resistant to Stir,
하악지에서의 하치조신경관 주행에 대한 Conebeam CT를 이용한 연구
김형우,권경환,민승기,오승환,지영덕,고세욱,이재환,온병훈,Kim, Hyong-Woo,Kwon, Kyung-Hwan,Min, Seung-Ki,Oh, Seung-Hwan,Chee, Young-Deok,Koh, Se-Wook,Lee, Jae-Hwan,Ohn, Byung-Hun 대한악안면성형재건외과학회 2009 Maxillofacial Plastic Reconstructive Surgery Vol.31 No.5
Objectives: This study was performed to evaluate course of the inferior alveolar canal in the mandibular ramus and to find safety zone when ramal bone is harvested. Patients and Methods: From January, 2009 to February, 2009, the 20 patients who visited in the Department of Oral and Maxillofacial Surgery, Sanbon Dental Hospital. Wonkwang University and the Conebeam CT was taken of various chief complaints, were selected. The patients who had left and right mandibular first molar and incisor missing, jaw fracture and bone pathology were excluded. The R point was defined as the point which occlusal plane was crossed to the mandibular anterior ramus(external oblique ridge). In the cross-sectional coronal and axial views, the inferior alveolar canal position to the R point, buccal bone width(BW), alveolar crest distance(ACD), distance from alveolar crest to occlusal plane(COD) and inferior alveolar canal to sagittal plane(CS) were measured and horizontal distance(HD), vertical distance(VD) and nearest distance(ND) were measured. Results: The inferior alveolar canal is located $6.19{\pm}1.21\;mm$ from the R point. Horizontal distance from the R point were $13.07{\pm}2.45\;mm$, vertical distance from the R point were $14.24{\pm}2.41\;mm$ and nearest distance from the R point were $10.12{\pm}1.76\;mm$. The course of the inferior alveolar canal was positioned within $0.61{\pm}0.68\;mm$. The distance from external buccal bone to the inferior alveolar canal was increased from the R point anteriorly. Conclusions: It is considered that the mandibular ramus from the R point to 10 mm anteriorly can be harvested safely at ramal bone grafting.
김형우,김기범,배은정,노정일,김웅한,김해순 대한의학회 2010 Journal of Korean medical science Vol.25 No.12
Cardiac resynchronization therapy (CRT) has been proven its value in adult patients with congestive heart failure of low ejection fraction and wide QRS duration. Contrast to adult patients, CRT has been rarely applied for young patients. We report on a 9-yr-old boy with progressive left ventricular (LV) dilatation and dysfunction following chronic VVI pacemaker therapy for congenital complete atrioventricular block associated with maternal anti-SSA/Ro and SSB/La antibody. His LV dysfunction was improved after epicardially established CRT.
Electrical Characteristics of SiC Lateral P-i-N Diodes Fabricated on SiC Semi-Insulating Substrate
김형우,석오균,문정현,방욱,조중열 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.1
Static characteristics of SiC (silicon carbide) lateral p-i-n diodes implemented on semiinsulating substrate without an epitaxial layer are investigated. On-axis SiC HPSI (high purity semiinsulating) and VDSI (vanadium doped semi-insulating) substrates are used to fabricate the lateral p-i-n diode. The space between anode and cathode (L AC ) is varied from 5 to 20 μm to investigate the effect of intrinsic-region length on static characteristics. Maximum breakdown voltages of HPSI and VDSI are 1117 and 841 V at L AC = 20 μm, respectively. Due to the doped vanadium ions in VDSI substrate, diffusion length of carriers in the VDSI substrate is less than that of the HPSI substrate. A forward voltage drop of the diode implemented on VDSI substrate is 12 V at the forward current of 1 μA, which is higher than 2.5 V of the diode implemented on HPSI substrate.
김형우,고영휘,강석호,이정구 대한비뇨의학회 2011 Investigative and Clinical Urology Vol.52 No.3
Purpose: This study was conducted to identify the predictive factors for prostate cancer in patients with prostate-specific antigen (PSA) levels equal to or less than 4 ng/ml. Materials and Methods: A retrospective study of medical records was conducted on 292 patients with initial serum PSA ≤4 ng/ml among 2,305 patients who underwent prostate biopsy from January 2003 to December 2008. Prostate biopsy was performed on patients with PSA ≤4 ng/ml in the case of abnormal findings in the digital rectal examination (DRE) or transrectal ultrasonography (TRUS) or in those with a PSA level higher than the age-adjusted PSA levels. The patients were divided into the group diagnosed with prostate cancer and the non-prostate-cancer group. Subsequently, the variables of the two groups were compared. Results: The patients’ mean age was significantly higher in the prostate cancer group (n=28) than in the non-prostate-cancer group (n=264; p=0.033). In addition, for the patients with a PSA range of 2.0-2.9 ng/ml, their age (p=0.049) and PSA density (PSAD; p=0.042) were significantly higher and the prostate volume (p=0.028) was significantly smaller in the prostate cancer group than in the non-prostate-cancer group. Conclusions: Of the patients with PSA ≤4 ng/ml, the age of the patients who showed abnormal findings in the DRE or TRUS or who had a PSA level higher than the age-adjusted PSA level was a significant predictive factor for prostate cancer. In particular, for the PSA range of 2.0-2.9 ng/ml, a thorough screening test for prostate cancer was required if the patients had conditions such as higher age, smaller prostate, and higher PSAD.
표면 전하에 의한 Thyristor 소자의 차단전압 및 누설전류특성 연구
김형우,서길수,방욱,김기현,김남균 대한전기학회 2006 전기학회논문지C Vol.55 No.1(C)
- In high-voltage devices such as thyristor, beveling is mostly used junction termination method to reduce the surface electric field far below the bulk electric field and to expand the depletion region thus that breakdown occurs in the bulk of the device rather than at the surface. However, coating material used to protect the surface of the device contain so many charges which affect the electrical characteristics of the device. And device reliability is also affected by this charge. Therefore, it is needed to analyze the effect of surface charge on electrical characteristics of the device. In this paper, we analyzed the breakdown voltage and leakage current characteristics of the thyristor as a function of the amount of surface charge density. Two dimensional process simulator ATHENA and two-dimensional device simulator ATLAS is used to analyze the surface charge effects.