Tetrafluoroethylene 흡입에 의한 급성폐손상

이수옥 ( Su Ok Lee ),최은정 ( Eun Jung Choi ),김가영 ( Ka Young Kim ),김준철 ( Jun Chul Kim ),박정철 ( Jung Chul Park ),정치영 ( Chi Young Jung ),김연재 ( Yeon Jae Kim ),이병기 ( Byung Ki Lee ) 대한결핵 및 호흡기학회 2007 Tuberculosis and Respiratory Diseases Vol.62 No.3

Tetrafluoroethylene is a colorless gas that can be used to synthesize a variety of fluoride compounds by polymerization (e.g., Teflon). Fluoride compounds have many applications in industry. There are several reports of inhalation injury from the pyrolytic product of fluoride compounds. When the polymer is heated under the conditions of inadequate ventilation, the fumes can cause polymer fume fever or pulmonary edema which manifested as symptoms such as fever, chill, profuse sweating, cough and dyspnea. However there are no reports of a direct lung injury caused by tetrafluoroethylene. We report a case of a 27-year-old male presented with acute lung injury after inhaling concentrated tetrafluoroethylene. He complained of cough and dyspnea after the accidental inhalation of tetrfluoroethylene at his workplace. The symptoms improved without any complications after conservative treatment with oxygen and steroid. (Tuberc Respir Dis 2007; 62: 223-226)

발달장애 학생을 양육하는 어머니가 인식하는 자녀의 성행동에 대한 연구

이수옥 ( Su-ok Lee ),임호찬 ( Ho-chan Lim ) 한국발달장애학회 2022 발달장애연구 Vol.26 No.2

본 연구는 발달장애 학생을 둔 어머니가 인식 또는 목격한 자녀의 성행동 표출 연령을 조사하고, 성행위 표출유형과 빈도, 목격 장소를 조사한 연구이다. 연구를 위해서 A도 B시와 C시에 거주하는 59명의 응답내용을 분석하였다. 기술 통계와 항목별 백분율을 분석하였다. 연구결과를 보면, 총 59명 중 53명(89.8%)이 자녀의 성행동을 목격한 것으로 나타났으며 발달장애 학생을 둔 어머니가 인식하는 자녀의 성행동 시작연령은 평균 5.72로 자녀의 성행동 시작 연령이 낮은 것으로 나타났다. 성행동 유형은 분석결과 자위행위가 50.8%였으며, 성행동 빈도는 일주일에 평균 10.91회로 성행동이 비교적 잦은 것으로 나타났다. 응답자 58명 중 51명(86.4%)이 자녀의 성행동 지도에 관한 교육을 받을 의향이 있다고 응답하였으며, 발달장애 자녀를 양육하고 있는 부모들 대상으로 성행동에 대한 지도 및 대처방법 교육프로그램을 개발할 필요성이 있음이 시사된다. This study investigates the age of sexual behavior expression of children perceived or witnessed by mothers with developmental disabilities, and investigates the type, frequency, and place of sighting of sexual behavior expression. For the study, the responses of 59 people living in B and C cities in A were analyzed. Descriptive statistics and itemized percentages were analyzed. According to the results of the study, 53 out of 59 people (89.8%) witnessed their children's sexual behavior, and the average age of children's sexual behavior perceived by mothers with developmental disabilities was 5.72, indicating that the age of their children's sexual behavior was low. As a result of the analysis, the type of sexual behavior was 50.8% due to masturbation, and the frequency of sexual behavior was 10.91 times a week on average. 51 out of 58 respondents (86.4%) said they were willing to receive sexuality guide education for their children's sexual behavior, suggesting that there is a need for sexuality education and how to cope with their children's sexual behavior.

모바일 디바이스를 위한 SVG Trns-Gateway 시스템의 설계구현

이수현(Su-Hyun Lee),유남현(Nam-Hyun Yoo),이형옥(Hyung-Ok Lee) 한국멀티미디어학회 2004 한국멀티미디어학회 학술발표논문집 Vol.2004 No.1

금속하부구조물이 도재의 색조에 미치는 영향에 대한 분광측색분석

이수옥,우이형,최대균,권긍록,Lee Su-Ok,Woo Yi-Hyung,Choi Dae-Gyun,Kwon Keung-Rok 대한치과보철학회 2003 대한치과보철학회지 Vol.41 No.2

Statement of problem Metal-ceramic restorations have been used extensively by dental clinicians for nearly 40 years. Strength an functional ability of metal-ceramic restorations are proved to be satisfying, However esthetics and biocompatibility of metal alloy which is used in metal-ceramic restoration is not ideal. Using pure gold as an alternative, have advantage of esthetics, biocompatibility over conventional metal alloy. But there had been little article which studied on the color effect of pure gold on fual porcelain color. Purpose The purpose of this study was to spectrophotometrically evaluate the difference between color of metal alloy(Au-Pt, Ni-Cr) and pure gold, during color masking procedure with opaque porcelain and to analyze the differences, Material and Methods Three types of metal - base metal(Ni-Cr), high gold alloy(Au-Pt), pure gold(GES) - specimen were fabricated 1cm in diameter. Four steps were established - after finishing, after pre-coditioning, after application of first opaque porcelain(0.08mm in thickness), after application of second opaque porcelain(0.15mm in thickness)- and tested color with spectrophotometer every each steps and analyzed with $CIEL^*a^*b^*$ color order system. One-Way ANOVA test was used to and out if there were significant differences between groups tested and Shaffe multiple comparison was used to identify where the differences were. Results 1. After finishing and pre-conditioning, pure gold(GES) group showed most high values in $L^*,a^*,b^*$. 2. After application of first opaque porcelain(0.08mm in thickness), after application of second opaque porcelain(0.15mm in thickness), pure gold(GES) group showed the least difference in $L^*,a^*,b^*$ values and the lowest ${\Delta}E$ value(${\Delta}E$=0.63). 3. After application of first opaque porcelain and after application of second opaque porcelain differences that were significant (P<0.05) between groups were found only in $a^*$ values. 4. Base metal alloy group showed the lowest $a^*$ value in test after application of first opaque porcelain and the highest value in test after application of first opaque porcelain Conclusion Pure gold group and high gold group showed higher $a^*$ values than base metal group when tested after 0.08mm thickness of opaque porcelain was applied and pure gold group showed much similar $L^*,a^*,b^*$ values between 0.08mm thickness and 0.15mm thickness of opaque porcelain. This meant that pure gold was more easily masked by opaque porcelain than the other two groups.

이중관으로 연결된 자연치와 임플랜트의 악골 내응력분포에 관한 3차원 유한요소분석

이수옥,최대균,권긍록,우이형,Lee, Su-Ok,Choi, Dae-Gyun,Kwon, Kung-Rock,Woo, Yi-Hyung 대한치과보철학회 2008 대한치과보철학회지 Vol.46 No.4

서론: 임플랜트와 자연치가 혼재하는 증례에 있어서 보철물의 연결여부와 그 결과에 대해 논쟁이 많이 있어왔다. 본 연구에서는 임플랜트와 자연치를 이중관으로 연결했을 경우에 치조골 내에서 임플랜트 주변 조직의 하중에 대한 응력의 양상을 분석하여 자연 치와 임플랜트를 연결하는 보철물의 방식으로 이중관의 사용가능성을 비교 분석하고자 하였다. 연구재료 및 방법: 실험군으로서는 한 개의 자연치아와 한 개의 임플랜트를 이중관으로 연결한 모델을 사용하고, 대조군으로 두 개의 임플랜트를 이중관으로 연결한 모델을 사용하여 응력분포의 차이를 비교분석하였다. 임플랜트와 자연치 각각 통상적인 금합금을 사용하여 내,외관을 모델링한 후 각각의 외관을 연결한 구조를 형성한다. 내관과 외관은 $6^{\circ}$의 경사도 (taper)로 형성하고 내외관 사이의 공간을 인정하여, 하중을 가했을 경우 내외관 사이에 합금의 마찰력과 변위를 계산하여, 그 결과가 골내 임플랜트의 응력 분포에 영향을 줄 수 있도록 실험모델을 형성하였다. 하중은 일반적인 저작력의 크기로 임플랜트 부위와 자연치 부위에 각각 부여하여 응력의 차이를 비교하였으며, 최종적으로 대조군과의 차이를 비교하고자 하였다. 하중 조건은 임플랜트와 자연치아 사이, 임플랜트 후방, 전방부 자연치아의 사이에 하중을 가하였으며, Load case 1, 2, 3로 분류하였다. 실험을 위해서 ANSYS Version 8.1을 사용하여 3차원 유한 요소 분석을 시행하였다. 연구성적: 지대주에 가해지는 응력 - 최대 응력은 실험군이 대조군에 비해 각각 2.4 (Load Case1), 1.02 (Load Case2), 0.46 (Load Case3)배 높게 나타났으며,Load Case3의 경우 대조군의 최대응력이 더욱 높게 나타났는데, 이것은 전치부 치아의 경우 하중을 효과적으로 분산하기 때문인 것으로 보인다. 악골내에 가해지는 응력 - 악골내에서 최대 응력은 실험군이 대조군에 비해 각각 1.69 (Load Case1), 1.26 (Load Case2), 1.93 (Load Case3) 배 크게 나타났다 결론: 임플랜트와 자연치아가 혼재된 경우, 이중관으로 상부 보철물을 연결한 경우, 임플랜트만으로 구성된 대조군에 비해, 임플랜트 및 임플랜트 식립 부위의 악골에 가해지는 최대 응력은 1.02 에서 2.4배 가량 높게 나타났다. 자연치아의 움직임이 임플랜트의 경부 및 악골 내에 응력을 집중시킨 것으로 보이며, 자연치아가 있는 악골부위에서는 응력이 거의 발생하지 않았다. 본 실험의 경우 자연치아와 임플랜트에서 모든 하중을 받는 것으로 계산하였고, 실제 가철성 의치에서 나타나는 점막의 영향을 배제하였기 때문에, 실제 임상에서는 후방 임플랜트에 미치는 최대 응력의 크기는 2.4배 이하일 것으로 추정할 수 있다. 앞으로, 실제 임상에 적용하였을 경우, 임플랜트에 미치는 영향 및 자연치아에 미치는 결과에 대한 연구가 필요할 것이다. Purpoose: For decades dental implants have been used widely in the field of prosthetic dentistry. However there is confusion when establishing treatment plans in cases where some teeth are remained but an insufficient number of implants can be used due to limited anatomical status and ecomomical problems. Many clinicians have tried to connect natural teeth and implants, and it still has controversy. But, there have been few studies on mechanical analysis of connecting natural teeth and implants with konus telescopic removable partial dentures. The purpose of this study was to analyze the stress distribution of prosthesis, abutment and alveolar bone when teeth and implants were connected with the konus telescopic denture, by means of 3-dimensional finite element analysis. Material and methods: The assumption of this study was that there were 2 mandibular canine (11 mm in length, 4 mm in diameter) and 2 implants(10 mm in length, 4 mm in diameter) which are located in the second premolar region. The mandible, teeth, implants, abutments, and connectors are modeled, and analyzed with the commercial software, ANSYS Version 8.1(Swanson, Inc., USA). The control group used implants instead of natural teeth. 21038 elements, 23544 nodes were used in experimental group and 107595 elements, 21963 nodes were used in control group, Stress distribution was evaluated under 150 N vertical load on 3 experimental conditions - between teeth and implants (Load case 1), posterior to implants (Load case 2), between natural teeth (Load case 3). Results: 1. In all load cases, higher von mises stress value was observed in the experimental group. 2. Maximum von miss stress observed in all load cases and all locations were as follows ; a. 929.44 Mpa in the experimental group, 640.044 Mpa in the control group in outer crown and connector - The experimental group showed 1.45 times high value compared with the control group. b. 145,051 Mpa in the experimental group, 142.338 Mpa in the control group in abutment - The experimental group showed 1.02times high value compared with the control group. c. 32.489 Mpa in the experimental group, 25.765 Mpa in the control group in alveolar bone - The experimental group showed 1.26times higher value compared with the control group. 3. All maximum von mises stress was observed in load case 2, and maxim von mises stress in alveolar bone was 32.489 Mpa at which implant failure cannot occur. 4. If maximum von mises stress is compared between two groups, the value of the experimental group is 1.02 times higher than the control group in abutment, 1.26 times higher than the control group in alveolar bone. Conclusion: If natural teeth and implants are connected with the konus telescopic denture, maximum stress will be similar in abutment, 1.26 times higher in alveolar bone than the control group. With this result, there may be possible to make to avoid konus telescopic dentures where natural teeth and implants exist together.

삼점 신호 평균기법에 의한 요속신호의 잡음 축소 기법

최성수(Seong-Su Choi),이인광(In-Kwang Lee),이상봉(Sang-Bong Lee),박준오(Jun-Oh Park),이수옥(Su-Ok Lee),차은종(Eun-Jong Cha),김경아(Kyung-Ah Kim) 대한전기학회 2009 전기학회논문지 Vol.58 No.8

Uroflowmetry is a convenient clinical test to screen the benign prostatic hyperplasia(BPH) common in the aged men. A load cell is located beneath the urine container to measure the weight of urine. However, it is sensitive to the impact applied on the bottom of the container by the urine stream, which could be a noise source lowering the reliability of the system. With this aim, our study proposed a noise reduction technique by computing ensemble average of the weighted signals that were acquired from three-load cells forming a regular triangle beneath the urine container. Simulated urination experiment was performed with three different collection methods, all of which demonstrated significant noise reduction by ensemble averaging. Furthermore, the best results can be obtained without any special urine collection devices. Thus, our novel method can be usefully applied to uroflowmetry for enhancing measurement in terms of accuracy and reliability.

와류 현상을 이용하는 호흡기류센서

김경아,이인광,박준오,이수옥,신은영,김윤기,김경천,차은종,Kim, Kyung-Ah,Lee, In-Kwang,Park, Jun-Oh,Lee, Su-Ok,Shin, Eun-Young,Kim, Yoon-Kee,Kim, Kyung-Chun,Cha, Eun-Jong 대한의용생체공학회 2009 의공학회지 Vol.30 No.5

The present study developed a new technique with no physical object on the flow stream but enabling the air flow measurement and easily incorporated with the devices for cardiopulmonary resuscitation(CPR) procedure. A turbulence chamber was formed in the middle of the respiratory tube by locally enlarging the cross-sectional area where the flow related turbulence was generated inducing energy loss which was in turn converted into pressure difference. The turbulence chamber was simply an empty enlarged air space, thus no physical object existed on the flow stream, but still the flow rate could be evaluated. Computer simulation demonstrated stable turbulence formation big enough to measure. Experiment was followed on the proto-type transducer, the results of which were within ${\pm}5%$ error compared to the simulation data. Both inspiratory and expiratory flows were obtained with symmetric measurement characteristics. Quadratic curve fitting provided excellent calibration formula with a correlation coefficient>0.999(P<0.0001) and the mean relative error<1%. The present results can be usefully applied to accurately monitor the air flow rate during CPR.

3D printing으로 제작된 금속 코어와 치과용 도재 간의 전단결합강도 평가

정재관(Jung, Jae-Kwan),이수옥(Lee, Su-Ok),김기백(Kim, Ki-Baek) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.4

3D 프린팅 기술은 최근 치과용 보철물 제작 기술로 도입이 되었다. 본 연구의 목적은 3D 프린팅 기술에 의해 제작된 금속 코어와 상부 도재와의 전단결합강도를 평가하는 것이다. 본 연구를 위해 30개의 금속 코어를 제작하였다(cast 15개, 3D printing 15개). 금속 코어에 치과용 도재를 축성하여 시편 제작을 완료하였다. 완성된 시편의 전단결합강도는 crosshead speed 1mm/min으로 하중을 가하여 측정하였으며, 두 그룹의 전단결합강도 값 사이에는 통계적으로 유의한지 알아보기 위하여 Mann-Whitney test를 이용하였다(유의수준 0.05). 측정이 끝난 후 시편을 대상으로 파절양상을 분석하였다. 본 연구를 위한 실험 설계, 금속 코어 제작, 도재 축성 등의 시편 제작부터 실험 수행과 수행 후 실험 데이터 분석과 통계 분석 그리고 파절된 시편을 대상으로 한 파절 양상 분석까지 총 6개월이 소요되었다. 실험 결과 cast 50.14, 3D printing 54.36 MPa를 갖는 것으로 조사되었고, 통계적으로도 유의하였다. 파절양상은 두 집단 모두 시편의 대부분이 혼합형 파절양상을 보였다. 이와 같은 결과 들로 미루어볼 때 3D 프린팅에 의해 제작된 금속도재관 제작을 위한 금속 코어는 임상적으로 허용이 가능할 것으로 사료된다. The purpose of this study was to evaluate the shear bond strength between metal core fabricated by 3D printing and dental porcelain. Thirty metal cores were fabricated(cast 15ea, 3D printing 15ea). The porcelain for each group was builded to the metal core. Sample was loaded to shear force(crosshead speed 1mm/min) in a universal material testing machine. The fracture samples were analyzed failure aspect. The means were statistical analyzed using by Mann-whitney test(α=0.05). The period of experimental(metal cores fabrication, dental porcelain build up, data analysis, statistical analysis, failure aspect analysis and others) for this study took six months. The mean±SDs of shear bond strength was 50.14±1.60MPa for the cast group, and 54.36±3.18MPa for the 3D printing group(p=0.035). The failure aspect showed mixed failure. As a results, metal cores fabricated by 3D printing method were clinically acceptable range.

알칼리 활성반응에 의한 Briquette ash의 강도 발현 특성

서명덕,이수정,박현혜,김윤종,이수옥,김택남,조성백,Seo, Myeong-Deok,Lee, Su-Jeong,Park, Hyun-Hye,Kim, Yun-Jong,Lee, Su-Ok,Kim, Taik-Nam,Cho, Sung-Baek 한국재료학회 2008 한국재료학회지 Vol.18 No.9

Non-sintering cement was manufactured with briquette ash. Alkali activator for compression bodies used a NaOH solution. In order to apply alkali-activated briquette ash and the non-sintering cement to concrete, several experimental studies were performed. It was necessary to study the binder obtained by means of a substitute for the cement. This study concentrated on strength development according to the concentration of NaOH solution, the curing temperature, and the curing time. The highest compressive strength of compression bodies appeared as $353kgf/cm^2$ cured at $80^{\circ}C$ for 28 days. This result indicates that a higher curing temperature is needed to get a higher strength body. Also, geopolymerization was examined by SEM and XRD analysis after the curing of compression bodies. According to SEM and XRD, the main reaction product in the alkali activated briquette ash is aluminosilicate crystal.

청주지역 주부들의 환경정의에 관한 의식

강영복 ( Young Pork Kang ),이수옥 ( Su Ok Lee ) 한국지리환경교육학회 2006 한국지리환경교육학회지 Vol.14 No.3