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심음을 이용한 SVM 기반의 심장 질환 판별에 관한 연구
김보리(Kim Bo-Ri),백승화(Seung-hwa),김동완(Kim Dong-Wan),백승은(Paek Seung-eun),권순태(Kwon Sun-Tae) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
심음은 심장이 수축, 확장 시에 심장의 움직임과 혈류의 흐름에 의해 발생하는 음향이다. 심음은 여러 신호원으로 이루어져 있고, 매우 복잡하고 비고정적인 신호이다. 심장의 질환에 따라 심음의 소리는 다르게 나타난다. 심음을 구분하여 심장 질환의 유무를 판단하는 가장 기초적인 기준이 될 수 있다. 본 연구에서는 Support Vector Machine 기법을 이용하여 심음을 통한 심장 질환 판별 검출 알고리즘을 제안하였다. Support Vector Machine은 신경망의 한 종류이며 이진분류에서 좋은 성능을 보인다. 또한 Polynomial Radial Basis Function, Multi-Layer Perceptron Classifiers를 위한 대안적인 학습방법으로 사용된다. 이러한 특성을 사용하여 심음의 데이터들을 일정한 기준에 의하여 (+)데이터와 (-)데이터로 분리한 후, 각 데이터들을 학습시켜 최적의 데이터를 만든다. 이후 각 데이터들은 점층적인 추가 학습을 시킴으로써 적은 양의 학습 데이터만으로도 높은 분류 성능을 표현할 수 있다. 이 연구에서 제안된 SVM을 실제 심음 데이터에 적용한 실험에서 심장 질환의 유무 판별에 우수한 성능을 보임을 확인할 수 있을 것으로 판단된다.
김보리 ( Bo Ri Kim ),변상영 ( Sang Young Byun ),정진호 ( Jin Ho Chung ),조광현 ( Kwang Hyun Cho ) 대한피부과학회 2015 대한피부과학회지 Vol.53 No.8
Oral lichen planus (OLP) is a relatively common chronic inflammatory disease of uncertain etiology. OLP lesions rarely undergo spontaneous remission and have the potential to undergo malignant transformation. The risk of malignant transformation in OLP is estimated to be between 0.4% and 5.3%; two clinical studies in Korea reported the frequency of malignant change as 2.9% and 2.85%. However, to the best of our knowledge, there has been no individual case report in the Korean dermatological literature to date regarding the malignant transformation of OLP. Herein, we report the case of a 77-year-old Korean woman with long-standing OLP that underwent transformation to oral squamous cell carcinoma. This is the first well-documented case report of squamous cell carcinoma that developed from OLP. (Korean J Dermatol 2015;53(8):635∼637)
김보리,이동호,김지우,심현익,박상현,신철민,한경도,윤상웅 대한피부과학회 2022 Annals of Dermatology Vol.34 No.3
Background: Although patients with psoriasis have an increased risk of cancers, little is known about the risk of psoriasis in cancer patients. Objective: We aimed to comparatively analyze the incidence and risk factors of psoriasis in gastric cancer patients who underwent gastrectomy and in the general population. Methods: A nationwide retrospective cohort of 52,608 gastric cancer survivors (2007~2015) was compared to 123,438 matched controls from the general population to estimate the incidence and hazard ratio (HR) of new-onset psoriasis. We also calculated the HRs for psoriasis according to adjuvant cancer treatment, obesity, and vitamin B12 supplementa- tion in gastric cancer survivors. Results: During a mean follow-up of 6.85 years, 645 of the 52,608 gastric cancer patients developed psoriasis, while 1,806 in the 123,438 matched control group developed psoria- sis. Gastric cancer patients had a decreased risk of psoriasis (HR, 0.86; 95% confidence interval, 0.79~0.94), especially those who underwent subtotal gastrectomy. We found that vitamin B12 supplementation for more than 3 years had an additive effect on decreasing the risk of psoriasis in gastric cancer patients who underwent subtotal gastrectomy. Total gastrectomy, radio/chemotherapy, and obesity did not affect the risk of psoriasis in gastric cancer survivors. Conclusion: The incidence of psoriasis is slightly lower in gastric cancer survivors than in the general population. Our results suggest that the development of psoriasis may be reduced by removing the source of systemic inflammation caused by infection through subtotal gastrectomy in gastric cancer survivors.
Multidose Use of Heparin and Lidocaine Vials: a Study in Stability and Sterility
김보리,오은숙,이정선,황보신이,박정준,탁경국,김기환 한국병원약사회 2008 병원약사회지 Vol.25 No.1
Heparin and lidocaine in Kangnam St. Mary's hospital are single-dose vials, but these are used as multi-dose vial when the dosage is low. There was no study about the stability of multi-dose use, so we studied about stability and sterility of multi-dose use of heparin and lidociane. Heparin inj® 1,000IU/ml and 5,000IU/ml vials were stored at room temperature, underrefrigeration, light protection and room light. We checked contents, external appearance and pH for the stability of heparin and the sterility was determined by checking the microbial growth at room temperature and under refrigeration at initial, 3rd, 7th, 15th day. The samples of lidocaine 2% inj® were collected in room temperature and under refrigeration to assess the stability and sterility of lidocaine and were checked contents and microbial growth. In result, heparin 1,000IU/ml, 5,000IU/ml and lidocaine did not change significantly for 15days and no microbial growth was noted in all conditions. Although both heparin and lidocaine were stable in 15days, this study has limitations: the small number of samples and difference of environment between laboratory and ward. More study about multi-dose use of injectable drugs is needed.
SVM을 기반으로 한 심음 기반의 심장 질환 판별에 관한 연구
金寶利,白承和,金東完 明知大學校 産業技術硏究所 2007 産業技術硏究所論文集 Vol.26 No.-
In this paper, Support Vector Machine Algorithms were used with promising results in various critical problems, concerning heart sound classification. In general this classification problem can be divided in many sub problems, each one dealing either with one morphological characteristic of the heart sound or with difficult to distinguish heart diseases. We proposed a ventricular fibrillation detection algorithm based on support vector machine classifier and Short Time Vector Machine, which could offer benefits to reduce the learning costs as well as good classification performance. It showed similar or higher values. Consequently, we could find that the proposed input features and SVM classifier would one of the most useful algorithm for cardiac disorder detection.