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Wavelet Packet Based Features for Insufficient Murmur Identification
Samjin Choi,Young-Kyun Shin,Youjin Cheong,Gi-Ja Lee,Hun-Kuk Park 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
This paper presents a new analysis method for aortic and mitral insufficient murmurs using wavelet packet decomposition. We proposed four diagnostic features including the maximum peak frequency, the position index of the wavelet packet coefficient corresponding to the maximum peak frequency, and the ratios of the wavelet energy and entropy information to achieve greater accuracy for detection of heart murmurs. The proposed wavelet packet based insufficient murmur analysis method was validated by some case studies. We employed a thresholding scheme to discriminate between insufficient murmurs and control sounds. Three hundred 32 heart sounds with 126 control and 206 murmur cases were acquired from four healthy volunteers and 47 patients who suffered from heart defects. Control sounds were recorded by applying a wireless electric stethoscope system to subjects with no history of other heart complications. Insufficient murmurs were grouped into two valvular heart defect categories, aortic and mitral. These murmur subjects had no other coexistent valvular defects. The proposed insufficient murmur detection method yielded a high classification efficiency of 99.78% specificity and 99.43% sensitivity.
Samjin Lim 한국재난정보학회 2012 한국재난정보학회 논문집 Vol.8 No.4
이 연구에서는 보행환경 만족도에 영향을 미치는 요인들을 찾기 위하여 시민 283명을 대상으로 설문지를 이용하여 보행환경개선사업이 시행된 서울의 6개 지역을 선정하여 생활도로 보행 시 보행환경에 대한 만족도를 조사하였다. 리커트 5점 척도를 이용한 조사 결과 보행환경에 대한 만족도는 평균 2.88 표준편차 1.12인 것으로 조사되어 만족도가 낮은 수준임을 확인하였다. 보행환경 만족도와 세부항목들 사이의 상관관계를 분석한 결과 보행환경 만족도와 상관계수가 높은 세부항목은 보행시 안전성(0.640), 걷고 싶은 느낌(0.603), 보행시 쾌적성(0.601), 산책하거나 대화를 나누기에 적당함(0.586) 등인 것으로 분석되었다. 이 연구는 생활도로 보행환경 개선사업의 실효성을 높이기 위해서는 안전을 중시하면서도 시설물을 설치하는 데 머물기보다 쾌적한 환경을 조성하기 위한 보다 적극적인 개념의 생활도로 환경정비 기법을 적용해야 할 것이며 주민참여가 중요하다는 것을 확인하였다.
Choi, Samjin,Shin, Jae-Ho,Cheong, Youjin,Jin, Kyung-Hyun,Park, Hun-Kuk Cambridge University Press 2013 Microscopy and microanalysis Vol.19 No.5
<B>Abstract</B><P>This study quantitatively investigated the immediate effects of a photooxidative collagen cross-linking treatment with photosensitizer riboflavin (RF) and 370 nm UVA light in <I>in vitro</I> human corneoscleral collagen fibrils using histology, thickness, scanning electron microscopy, and atomic force microscopy analyses. Twenty 8 × 2 mm corneoscleral strips were dissected sagittally from donor tissue using a scalpel. Four parameters were investigated, including the density, thickness, adhesion force, and stiffness of corneoscleral tissues before and after the collagen cross-linking treatment. The RFUVA-catalyzed collagen cross-linking treatment led to an increase in the density of both corneal (8%) and scleral (23%) stromal collagens. However, there was no difference in corneoscleral thickness. Furthermore, RFUVA-catalyzed collagen cross-linking treatment led to an increased biomechanical response of corneosclera: 25 and 8% increases in corneoscleral stiffness, and 24 and 22% increases in corneoscleral adhesion force. The collagen cross-linking treatment through RF-sensitized photoreaction may cause structural and biomechanical changes in the collagen fibril network of the cornea and the sclera. This is due to narrowing of the interfibrillar spacing and the stromal edema.</P>
Short-term nanostructural effects of high radiofrequency treatment on the skin tissues of rabbits.
Choi, Samjin,Cheong, Youjin,Shin, Jae-Ho,Lee, Hui-Jae,Lee, Gi-Ja,Choi, Seok Keun,Jin, Kyung-Hyun,Park, Hun-Kuk Baillière Tindall ; Springer London 2012 Lasers in medical science Vol.27 No.5
<P>The aim of this study is to quantitatively investigate the short-term effects of RF tissue-tightening treatment in in vivo rabbit dermal collagen fibrils. These effects were measured at different energy levels and at varying pass procedures on the nanostructural response level using histology and AFM analysis. Each rabbit was divided into one of seven experimental groups, which included the following: control group, and six RF group according to RF energy (20?W and 40?W) and three RF pass procedures. The progressive changes in the diameter and D-periodicity of rabbit dermal collagen fibrils were investigated in detail over a 7-day post-treatment period. The dermal tissues treated with the RF tissue-tightening device showed more prominent inflammatory responses with inflammatory cell ingrowth compared to the control. This effect showed more prominent with the passage of day after treatment. Although an increase in the diameter and D-periodicity of dermal collagen fibrils was identified immediately after the RF treatment, a decrease in the morphology of dermal collagen fibrils continued until post-operative day 7. Furthermore, RF treatment led to the loss of distinct borders. Increases in RF energy with the same pass procedure, as well as an increase in the number of RF passes, increased the occurrence of irreversible collagen fibril injury. A multiple-pass treatment at low energy rather than a single-pass treatment at high energy showed a large amount of collagen fibrils contraction at the nanostructural level.</P>
Choi, Samjin,Cheong, Youjin,Shin, Jae-Ho,Kim, Kyung A,Bang, Jae Beum,Jin, Kyung-Hyun,Park, Hun-Kuk Cambridge University Press 2013 Microscopy and microanalysis Vol.19 No.1
<B>Abstract</B><P>This study investigated the inflammatory effect of intraoperative mitomycin C (MMC) on adhesion reformation in human rectus muscles. Ten consecutive patients who underwent medial rectus resection had their postoperative rectus muscles divided into two groups: control group (<I>n</I> = 10) and MMC group (<I>n</I> = 10). In the MMC group, the muscle was soaked for 2 min with MMC, prepared as a 0.2 mg/mL (0.02%) solution. The 0.02% MMC reactions were examined using histological analysis with hematoxylin-eosin (inflammatory response) and Masson's trichrome (collagen fibrils), immunoreactivities of cyclooxygenase-II (inflammatory response), and collagen type I and III, scanning electron microscopy analysis to quantify the diameter and D-periodicity of collagen fibrils, and atomic force microscopy analysis to quantify the diameter, D-periodicity, and adhesion force of collagen fibrils. The rectus muscles treated with 0.02% MMC showed a significantly increased inflammatory response (<I>p</I> < 0.05), increased collagen density (<I>p</I> < 0.0001), increased fibril diameter (<I>p</I> < 0.001 or <I>p</I> < 0.05), and decreased fibril adhesion force (<I>p</I> < 0.005) compared to the rectus muscles in the control group. MMC simultaneously caused an inflammatory response as well as nanostructural and biomechanical property changes in the collagen fibril network.</P>