15-리드 심전계용 표준 시뮬레이터의 개발

강유민(Yu Min Kang),이진홍(Jin Hong Lee),최성욱(Seong Wook Choi) 대한기계학회 2015 大韓機械學會論文集B Vol.39 No.5

15 리드 심전도는 12 리드 심전도가 진단하지 못하는 심장의 후벽질환 등을 진단하기 위하여 개발되었다. 그러나 15 리드 심전도를 이용한 심장질환 진단알고리즘을 개발하기 위해 필요한 15 리드 심전도 데이터가 부족하고, 기존의 심전도 시뮬레이터는 전극의 부착위치나 심장질환에 따라 달라지는 심전도의 형태를 예측할 수 없는 문제가 있다. 따라서 이러한 문제를 해결하기 위하여 심장을 전기적인 캐패시턴스를 가지는 15 개의 부분으로 나누고 전기적인 저항소자를 통하여 연결된 LPM 을 제작하였다. 심장의 전기전도기전을 모사하기 위하여 각 절점은 전류원과 연결되고 위치와 시간지연을 고려한 개별적인 전류를 인가하였다. 본 연구의 목적은 제작한 LPM 의 각 절점에 특정한 전류를 인가함으로써 심전도로서 활용 가능한 파형을 얻는데 있다. A 15-Lead ECG has been developed to diagnose posterior wall diseases of the heart that a 12-Lead ECG cannot diagnose. However, 15-Lead ECG data for developing heart-diseases-detecting algorithm are limited, and previous ECG simulators cannot predict the ECG waveform according to the changes in electrode. To solve these problems, the lumped parameter model (LPM), which divides the heart into 15 sections with varying electrical capacitance and electrical resistance. To imitate the electrical conduction in the heart, each node was connected to a current source and delivered the specific current considering the positions and time delay. The purpose of this study is to acquire the waveform that can be used in an ECG by delivering the specific current to LPM.

일반 사료와 동결건조 사료의 기호성 차이 분석

강유민(Yu Min Kang),정다민(Da Min Jeong),정훈(Hoon Chung) 반려동물연구학회 2021 Animalia Vol.3 No.1

본 연구에서는 동결건조 사료와 일반 사료에 대한 개의 기호성을 섭취 행동에 따라 비교 분석하였다. 실험 대상은 총 개 4마리로, 대형견(Golden Retriever) 2마리와 소형견(Shih Tzu) 2마리로 구성하였다. 실험은 스트레스에 의한 변수를 최소화하기 위해 실험견의 생활공간에서 진행되었다. 또한, 허기에 의한 변수를 최소화하기 위해 실험 시간은 아침 사료 급여 후로 선정하였다. 실험에 사용된 동결건조 사료와 일반 사료는 각각 세 종류씩 선정하였으며, 섭취 시간, 산만함의 정도, 섭취 후 행동, 잔여 사료량, 그릇 탐색 횟수 등을 척도로 삼아 기호성 차이를 분석하였다. 그 결과 평균적으로 네 마리의 개 모두 동결건조 사료에 대한 기호성이 일반 사료보다 높았으며, 특히 섭취 시간에 대한 차이가 두드러지게 나타났다. In this study, dog preferences for freeze-dried feed and general feed were compared and analyzed according to intake behavior. The subjects of the experiment consisted of a total of 4 dogs, 2 large dogs (Golden Retriever) and 2 small dogs (Shih Tzu). The experiment was conducted in the living space of the experimental dog to minimize variables caused by stress. In addition, in order to minimize the variables due to hunger, the experimental time was selected after the morning feed benefit. Three types of freeze-dried feed and general feed used in the experiment were selected, and differences in preference were analyzed using intake time, degree of distraction, behavior after intake, residual feed amount, and number of vessel searches as measures. As a result, on average, all four dogs had a higher preference for freeze-dried feed than general feed, and in particular, the difference in intake time was noticeable.

어머니의 구강건강정보이해력이 유아 자녀의 구강건강상태와 행동에 미치는 영향

강유민 ( Yu Min Kang ),조영식 ( Young Sik Cho ) 한국치위생과학회 2016 치위생과학회지 Vol.16 No.1

The purpose of this study was to examine how oral health literacy of mothers affect the oral health status of their preschool children. The subjects were 233 mothers and their preschool children who are between 5 and 6 years old. They were selected according to the convenience sampling method. The individual self-administered questionnaire was used for the mother’s survey while the children were interviewed using structured questionnaire to examine their oral health status and behavior. According to study results, the number of decayed primary teeth and the number of decayed and filled primary teeth had a statistically significant negative correlation with the oral health literacy of the mother, the children’s oral health knowledge, attitude and behavior (COHKAB), and the mother’s oral health management behavior. Hierarchical multiple regression analysis was performed after including general characteristics variables, the COHKAB and the mother’s oral health management behavior. Meanwhile, mother’s oral health literacy had a statistically influence on children’s oral health status. The higher the mother’s oral health literacy level, the lower the number of decayed and filled primary teeth were. The findings suggest that efforts to improve the oral health status of preschool children should consider mother’s oral health literacy as an important factor. Therefore, the effective intervention and education programs are necessary to enhance mother’s oral health literacy.

만성질환이 구강건강 행동에 미치는 영향

강유민 ( Yu-min Kang ),이인숙 ( In-sook Lee ),김나연 ( Na-yeon Kim ) 한국치위생학회(구 한국치위생교육학회) 2016 한국치위생학회지 Vol.16 No.6

Objectives: The purpose of this study was to examine the impact of chronic disease on oral health behavior. Methods: The subjects were 317 adults over 30-years old living in urban and rural areas. They were selected by convenience sampling method and filled out the self-reported questionnaire. The questionnaire consisted of general characteristics, dental treatment, chronic disease, and oral health behavior including oral health self-care behavior and professional oral health care. Results: The self-care oral health behavior and the professional oral health care had a negative correlation with the chronic diseases. Especially, the self-care oral health behavior and the professional oral health care had a statistically significant negative correlation with hypertension and osteoporosis. Multiple regression analysis was performed after including general characteristics, dental treatment, chronic disease. Meanwhile the presence of chronic disease had a significant influence on the self-care oral health behavior and the professional oral health care. Hypertension and Osteoporosis were the most influential factors of chronic diseases and had a significant influence on the oral health behavior. In conclusion, the chronic diseases aggravated the oral health behavior practice. Conclusions: presence of chronic disease affects oral health behavior. Therefore, the effective intervention and education programs related to oral health care are necessary to enhance adult`s oral health behavior and total health. The continuous follow-up study will determine the causal relationship between oral health behavior and the presence of chronic disease.

공압식 박동형 심실보조장치에서 공압관 내 공기압에 따른 박출량 추정

강유민(Yu Min Kang),이진홍(Jin Hong Lee),허균(Keun Her),최성욱(Seong Wook Choi) 대한기계학회 2014 大韓機械學會論文集B Vol.38 No.12

심실보조장치는 심장질환자에게 심장이식까지의 가교로서 사용된다. 공압식 박동형 심실보조장치를 체내에 이식했을 때, 심실보조장치를 통과하는 혈류가 느려질 경우 혈전이 발생할 수 있기 때문에 박출량을 측정하는 것이 중요하다. 심실보조장치의 박출량을 측정하기 위해 각종 센서를 함께 이식할 경우, 감염의 위험성이 커지기 때문에 본 연구에서는 체외에서 측정할 수 있는 공압관 내 압력을 통해 심실보조장치의 상태를 추정하고자 한다. 체외실험을 통해 공압식 박동형 심실보조장치의 공압관 내 차동압력과 심실보조장치 박출량의 상관관계를 계산하였다. Pearson correlation coefficient r=0.623 으로 두 값의 상관관계가 높으며, 박출량 추정값과 측정값에서 오차가 있었지만 공기 분자의 이동에 따른 식을 개발하여 박출량 추정의 정확성을 높일 수 있을 것으로 보인다. A ventricular assist device (VAD) is used for bridge to heart transplantation and heart diseases. Knowing the status of a pneumatic pulsatile VAD when implanting it into the body is important: when the velocity of blood flow through the VAD is slow, a thrombus may occur, and thrombosis can be fatal to a patient. In order to determine the state of a VAD, various sensors need to be implanted. Because this introduces the risk of infection and difficulties with sensor management, we developed a method for estimating the state of a VAD indirectly via the pressure in an air tube that can be measured in vitro. We compared the measured values to in vitro experimental results. The estimated and measured values showed some errors, but the accuracy can be improved by refining the estimation process to minimize the risk of infection.

증례 : 감염 ; Parvimonas Micra가 일으킨 화농성 척추염 1예

강유민 ( Yu Min Kang ),김가연 ( Ga Yeon Kim ),정영희 ( Young Hee Jung ),김치헌 ( Chi Heon Kim ),김의종 ( Eui Chong Kim ),김남중 ( Nam Joong Kim ),오명돈 ( Myoung Don Oh ) 대한내과학회 2012 대한내과학회지 Vol.82 No.5

Parvimonas micra is frequently associated with periodontal disease as well as respiratory, gastrointestinal, and female genitourinary tract infections, but only rarely has it been reported as a pathogenic agent of infectious spondylodiscitis. We describe the case of a 38-year-old woman with spondylodiscitis caused by P. micra. P. micra was cultured from the patient`s blood and vertebral tissue. This case was treated with vertebral corpectomy followed by intravenous ampicillin-sulbactam for four weeks. Her symptoms and vital signs improved, and elevated inflammatory markers were normalized after treatment. (Korean J Med 2012; 82:632-636)

치과의사의 서번트 리더십이 조직문화와 치과위생사의 행복지수에 미치는 영향

김나연 ( Na-yeon Kim ),배현숙 ( Hyeon-suk Bae ),강유민 ( Yu-min Kang ) 한국치위생학회(구 한국치위생교육학회) 2018 한국치위생학회지 Vol.18 No.2

Objectives: The purpose of this study was to examine how the dentist’s servant leadership affects the happiness index of dental hygienists. Methods: The subjects were 221 dental hygienists that have been working at dental clinics or dental hospitals. The data were analyzed using SPSS Version 20.0 (IBM Co., Armonk, NY, USA). An independent t-test and one-way ANOVA analysis were conducted to examine the difference in the happiness index of dental hygienists according to general characteristics. The independent t-test was conducted to examine organizational culture and happiness index according to upper and lower group based on the mean score for servant leadership. Pearson’s correlation analysis was used to examine the correlation among key factors. Multiple regression analysis was conducted to identify factors influencing the happiness index of dental hygienists. Results: According to the analysis, there was a statistically significant positive correlation between the dentist’s servant leadership, the organizational culture and the happiness index of dental hygienists. However, a stewardship of the dentist’s servant leadership factors was not found to have any correlation with the market culture. A multiple regression analysis was performed after including the dentist’s servant leadership, the organizational culture and the happiness index of dental hygienists. Meanwhile, the stewardship and community-building effect of the dentist’s servant leadership had a statistically significant effect on the happiness index of dental hygienists. Consequently, a higher servant leadership factor in dentists was correlated with a higher happiness index of dental hygienists. Conclusions: The findings show that the dentist’s servant leadership affect the happiness index of dental hygienists. Therefore, effective intervention and education programs related to the dentist’s servant leadership and sound organizational culture are necessary to enhance dental hygienists’ happiness index. Additionally, a follow-up study will determine the causal relationship among the dentist’s servant leadership, the organizational culture and the happiness index of dental hygienists, considering organizational members and the environment of the dental clinics.

리네졸리드와 반코마이신을 교대로 투여하여 치료한 지속성 메티실린 내성 황색포도알균 균혈증 1예

김낙현,김문석,장은선,강유민,김가연,장희창,박완범,김의종,김남중,오명돈 대한감염학회 2009 감염과 화학요법 Vol.41 No.6

Persistent Staphylococcus aureus bacteremia is frequently defined as bacteremia persisting for ≥7 days despite proper antibiotic therapy. Its treatment includes removal of all infection foci and proper antibiotic therapy. Vancomycin remains the antibiotic of choice in MRSA bacteremia. Alternative agents, linezolid or daptomycin, are available, but a consensus regarding management of persistent MRSA bacteremia on vancomycin failure is still lacking. We report a case of a 60-year-old male who received thoracoabdominal aorta replacement operation due to dissecting aneurysm of the ascending and descending aorta. Surgical site infection and bacteremia caused by MRSA occured, and wound debridement operations were performed. The patient was treated with vancomycin in therapeutic doses but MRSA bacteremia persisted for 168 days in a row. Although the inserted aortic graft was the most probable source of persistent bacteremia, surgical removal was impossible. Linezolid was administered as an alternative antibiotic but had to be discontinued from time to time due to thrombocytopenia induced by this agent. In the end, MRSA bacteremia was successfully managed by alternating vancomycin-linezolid therapy.