역행성 심정지 도관 삽입을 위한 술 중 경식도심초음파의 유용성

유미숙;최원주;김정원;박장수;김경태;김지연;어상일 인제대학교 2011 仁濟醫學 Vol.32 No.-

Background: Retrograde cardioplegia catheter (RCC) insertion is one of methods for administration of cardioplegics during cardiopulmonary bypass (CPB). However its success rate depends on only surgeon's experience. We thought the transesophageal echocardiography (TEE) can guide the R CC insertion, because TEE is commonly used for monitoring status of heart during cardiac surgery. This study was designed to evaluate the RC C insertion time by TEE guidance versus conventional method without T EE guidance. Methods: Sixty patients who were scheduled to undergo elective coronary artery bypass graft (CABG) surgery under general anesthesia were divided into groups as follows: group T [RCC insertion into coronary sinus (CS) by TEE guidance, n=30] and group C [RCC insertion into CS by conventional method, n=30]. We recorded the time of insertion of RCC in to CS in two groups. RCC insertion was done by TEE guidance in case that time was over two minutes by conventional methods in group C. Results: The overall time of RCC insertion into CS was 63.8 ± 23.6 seconds in the Group T and 102.3 ±55.7 seconds in the Group C, respectively (p=0.001). There were no complications during RCC into CS by T EE guidance. Conclusions: TEE guidance for RCC insertion into CS is shorten the time of insertion.

서울·경기 일부지역 대학생의 Take-out Food 이용실태

유성은,한영실,주나미 한국조리과학회 2003 한국식품조리과학회지 Vol.19 No.5

This study was designed to identify the teke-out food usage of university students in Seoul and Gyeonggi-do. Questionnaires were used to analyze these habits among 500 respondents. 1. The Frequency of Take-Out Food use: the greatest proportion of students useds take-out foods once or twice a week (33.8%). 2. The reasons for Take-Out Food use: fastness was the major reason (47.8%). 3. The day of the week for Take-Out Food use: the majority of the students used Take-Out foods regardless of the day (54.4%). 4. The time of day for Take-Out Food use: 6~8 p.m. for 31.6%. 5. The cost spent in each meal: 51.6% spent 3,000 to under 5,000 won. 6. The menus of Take-Out Food used: coffee was the most popular of all the take-out foods (43.6%). 7. Points considered when buying Take-Out Food: the majority of the college students thought tastes and quality of the foods were the most important considerations (51.0%). 8. The source of information about Take-Out Food: 43.4% of the students obtained information from their friends.

펜톤 시약 투입 변화에 따른 염색폐수의 처리효율 향상에 관한 연구

이상호,문혜진,김유미 대한상하수도학회 2003 상하수도학회지 Vol.17 No.1

This research was carried out to enhance the removal efficiencies of COD_Cr and color from dyeing wastewater by Fenton process, involving oxidation and coagulation. The experimental variables for this study include dosage division ratio of hydrogen peroxide and amount of Fenton's reagent. In the case of H_2O_2 divided dosage, 7:3 was more effective than 3:7 to remove COD_Cr and color. The results show than COD was mainly removed by Fenton coagulation, where the ferric ions are formed in the initial Fenton reaction. In contrast, color was removed by Fenton oxidation rather than Fenton coagulation. It was found out that overdose of Fenton's reagent has been applied in the "B" Treatment Plant. In spite of 20% reduction of the hydrogen peroxide dosage, effluents are satisfied with Discharged Water Quality Standards.

전동식 니켈 티타늄 파일의 표면 결함 및 단면 형태가 반복응력 하에서 피로 파절에 미치는 영향

신유미,김의성,김광만,금기연 大韓齒科保存學會 2004 Restorative Dentistry & Endodontics Vol.29 No.3

The purpose of this in vitro study was to evaluate the effect of surface defects and cross-sectional configuration of NiTi rotary files on the fatigue life under cyclic loading. Three NiTi rotary files (K3^(TM), ProFile®, and HERO 642®) with #30/.04 taper were evaluated. Each rotary file was divided into 2 subgroups: control (no surface defects) and experimental group (artificial surface defects). A total of six groups of each 10 were tested. The NiTi rotary files were rotated at 300rpm using the apparatus which simulated curved canal (40 degree of curvature) until they fracture. The number of cycles to fracture was calculated and the fractured surfaces were observed with a scanning electron microscope. The data were analyzed statistically. The results showed that experimental groups with surface defects had lower number of cycles to fracture than control group but there was only a statistical significance between control and experimental group in the K3^(TM) (p〈0.05). There was no strong correlation between the cross-sectional configuration area and fracture resistance under experimental conditions. Several of fractured files demonstrated characteristic patterns of brittle fracture consistent with the propagation of pre-existing cracks. This data indicate that surface defects of NiTi rotary files may significantly decrease fatigue life and it may be one possible factor for early fracture of NiTi rotary files in clinical practice.

근관 내 불규칙 확장부에서 sealer 적용방법에 따른 충전 효과 평가

김성용,이미정,문장원,이세준,유미경 大韓齒科保存學會 2005 Restorative Dentistry & Endodontics Vol.30 No.1

본 실험은 resin 시편을 이용하여 미리 제작한 근관 내 불규칙 확장부에서 근관 충전용 sealer의 적용 방법에 따른 충전 효과를 평가해 보았다. Endo-training Bloc을 절단하여 사십 개의 규격화된 resin 블록 시편을 획득하였다. 각각의 시편에 $, 08taper GT 파일을 사용하여 근관을 형성하였고 근관에 손상이 가지 않도록 시편을 양분한 후 양분된 시편의 한 쪽 근관 벽에 다양한 근관 내 확장부를 표현하는 구를 형성하였다. 양분된 시편을 결찰하고 절단 부위를 밀봉하였으며 AH26 sealer를 사용하여 단일 cone 충전법으로 근관을 충전하였다. 네 가지의 근관 충전용 sealer의 적용방법을 이용하였다: A군,$ K-file : B군, ultrasonic file : C군, lentulo spiral: D군. EZ-Fill bi-directioanl spiral. 모든 시편은 37˚상대습도에서 1주일간 보관한 후 각 시편을 근단에서 3mm, 4mm, 5mm 부위에서 수평으로 절단하고 각각의 절단면을 위상차현미경과 디지털 카메라를 이용하여 30배율로 관찰하고 촬영하였다. 관찰된 절단면은 scoring system을 이용하여 점수를 산정하였고 각 군 간의 통계적인 유의성 유무는 Fisher's Exact Test를 이용하여 시행하였다. The aim of this study was to evaluate the effectiveness of sealer placement in simulated root canal extensions. Forty resin blocks were attained from the Endo-training Bloc. In each block. The simulated root canal was made with $, 80taper GT file. After each block was longitudinally split into two halves, a standardized groove was prepared on one canal wall of two halves to simulate the canal extensions with various irregularities. The two halves of each block were assembled and all simulated root canals were obturated by single cone method with AH26 sealer. Four different methods of sealer placement were used: group A, $ K-file; group B, ultrasonic file; group C, lentulo spiral; group D, EZ-Fill bi-directional spiral. All obturated blocks were stored in 100% humidity at 37℃ for 1 week, Using a low speed saw, each block was sectioned horizontally. Images of the sections were taken using a stereomicroscope at 30 magnification and a digital camera. The amount of the sealer in the groove was evaluated using a scoring system, a higher score indicated better sealing effectiveness. The data was statistically analysed by Fisher's Exact Test. The sealing score was the lowest, specially at the middle area of canal extensions in group A, and that was statistically significant difference from other groups. In conclusion, the ultrasonic file, lentulo spiral and EZ-Fill bi-directional spiral were effective methods of sealer placement in simulated canal extensions. The K file was the least effective method, specially at the middle area of canal extensions.

질산화 작용이 있는 Aeromonas hydrophila의 동정 및 특성

엄미나,장재철,유영희,지의상 한국식품영양학회 2000 韓國食品營養學會誌 Vol.13 No.6

폐수처리 중 생물학적 처리에 활용할 수 있는 질소분해 능력을 가진 미생물을 분리하여 동정하고자 경기도내 하천 6지점에서 채취한 시료로부터 50개 균주를 선별하였다. 형태학적, 생화학적 및 배양학적 실험결과 Bergey's mannual of systematic bacteriology의 색인을 통하여 Aeromonas hydrophila로 동정하였다. Aeromonas hydrophila(AH-1). (AH-3), (AH-4), (AH-6) 균이 질산화 능력이 우수하였다. 4개 균주 모두 amoxillin, ampicillin, cephalothin과 ticarcillin에 내성을 나타내었다. 본 실험에서 분리한 .Aeromonas hydrophila의 질산화의 최적조건은 균 농도 1.0×l0exp(6) cells/ml, 배양온도 37℃로 나타났다. For the purpose of the isolation of microorganisms which have the capability of nitrification, we isolated the microorganisms in 6 samples collected from the stream of Kyonggi area. 60 strains were isolated. The selected strain were identified as a Aeromonas hydrophila based on the data obtained from the morphological, biochemical and cultural characteristics defined experiments. Among them Aeromonas hydrophila (AH-1), (AH-3), (AH-4), (AH-6) showed the highest nitrification capability. All isolates were resistant to amoxillin, ampicillin, cephalothin and ticarcillin. Optimum culture conditions of isolates were 37℃ and 1×10exp(8) cells/ml for 4 hours in the nitrate medium.

등장성 운동 시 회귀분석기간에 따른 근전도 중앙주파수 회귀직선의 특징

김유미,조상현,이영희 한국전문물리치료학회 2001 한국전문물리치료학회지 Vol.8 No.3

Many studies have shown that the initial median frequency (MDF) and slope correlate with the muscle fiber composition. This study tested the hypothesis that the initial MDF and slope are fixed, regardless of the inerval at which data are collected. MDF data using moving fast Fourier transformation of EMG signals, following local fatigue induced by isotonic exercise, were obtained. An inverse FFT was used to eliminate noise, and characteristic decreasing regression lines were obtained. The regression analysis was done in three different periods, the first one third, first half, and full period, looking at variance in the initial MDF, slope, and fatigue index. Data from surface EMG signals during fatiguing isotonic exercise of the biceps brachii and vastus lateralis in 20 normal subjects were collected. The loads tested were 30% and 60% maximum voluntary contraction (MVC) in the biceps brachii and 40% and 80% MVC in the vastus lateralis. The rate was 25 flexions per minute. There were no significant differences in the initial MDF or slope during the early or full periods of the regression, but there was a significant difference in the fatigue index. Therefore, to observe the change in the initial MDF and slope of the MDF regression line during isotonic exercise, this study suggest that only the early interval need to be observed.

지각과민억제제 적용이 수종 접착제의 미세인장결합강도에 미치는 영향

황성연,이경하,유미경,이광원 大韓齒科保存學會 2003 Restorative Dentistry & Endodontics Vol.28 No.5

This study evaluated the influence of a desensitizer(MS coat) on microtensile bond strength of different adhesives:a three step adhesive(All Bond 2), a two step adhesive(Single Bond), a one step adhesive(One up Bond F). Non-caries extracted human molars were used. Dentin surface was obtained by horizontal section on mid-portion of crown using a water cooled low speed diamond saw. Teeth were randomly divided into 6 group. AMO(MS coat + All Bond), SMO(MS coat + Single Bond) and OMO(MS coat + One up Bond F) dentin surface were treated with 17% EDTA before bonded adhesive. AMX, SMX and OMX dentin surface were bonded with All-Bond 2, Single Bond and One-up Bond F, respectively. with no previous treatment with MS coat and 17% EDTA. About 1cm high resin composite(Z 250) were incrementally build-up on the treated surface. The specimens for the microtensile test were serially sectioned perpendicular to the adhesive layer to obtain 0.7 × 0.7 mm sticks. 30 sticks were prepared from each group. After that, tensile bond strength for each stick was measured with Microtensile Tester at a 1mm/min crosshead speed. Fractured dentin surfaces were observed under the SEM. The results were statistically analysed by using a One way ANOVA and Tukey's test(p<0.05). Value in MPa were: AMO 44.35±13.21; SMO 39.35±13.32; OMO 31.07±1O.25; AMX 49.22± 16.38; SMX 56.02±13.35; OMX 72.93±16.19. Application of MS coat reduced microtensile bond strengths of both Single Bond and One up Bond F, whereas microtensile bond strengths of All Bond 2 were not affected significantly.

지루각화증과 유사한 임상양상을 보인 색소성 Bowen 병 1예

조유경,김미연,박영민,김형옥,안성열 대한피부과학회 2004 大韓皮膚科學會誌 Vol.42 No.3

Pigmented Bowen's disease is characterized by microscopically increased melanin pigment in the epidermis and/or papillary dermis in addition to the typical findings of Bowen's disease. Pigmented Bowen's disease is often confused clinically with pigmented lesions, such as seborrheic keratosis, melanocytic nevus, pigmented basal cell cacinoma and superficial spreading melanoma. A 74-year-old man presented with a black hyperkeratotic nodule ovrlying a solitary dark brownish patch on the scalp, this was clinically diagnosed as seborrheic keratosis. Histopathologic examination revealed pigmented Bowen's disease. We, herein, report an unusual case of pigmented Bowen's disease, which is the first reported case to have occurred on the scalp and to clinically resemble seborreic keratosis. (Korean J Dermatol 2004;42(3):381~383)

대량의 각혈로 사망한 장티푸스 1예

한상우,유진홍,권순석,김성훈,박지찬,홍은정,최경성,박용완,장준희,안지원,박유경,강지영,박상미,신완식 대한감염학회 2004 감염과 화학요법 Vol.36 No.5

We experienced a 25 year-old male patient with typhoid fever complicated with massive hemoptysis. Pulmonary complication in typhoid fever is very rare and to our knowledge, there has been no report of hemoptysis as a main cause of death with this disease. We herein report a rare case of typhoid fever.