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광용적맥파를 이용한 개인인증 기술 개발 적용에 대한 연구
문효정(H. J. Moon),손재범(J. B. Son),서수원(S. W. Seo),정의성(E. S. Jung) 한국재활복지공학회 2018 재활복지공학회논문지 Vol.12 No.4
생체인증 기술 (biometrics)은 보안 및 개인인증의 측면에서 폭넓게 사용되고 있으나, 복제의 위험, 인식률 저하 등의 문제가 있다. 본 연구에서는 이러한 단점을 보완하는 기술로 광용적맥파 (photoplethysmography, PPG)를 이용한 개인인증 방법을 제안한다. 제안하는 사용자 등록 알고리즘은 계측된 PPG 신호의 6개 특징값을 추출하여 데이터베이스에 저장하는 알고리즘이고, 이 계측된 데이터베이스와 새롭게 측정된 PPG 신호의 특징값을 비교분석하여 사용자를 식별하는 것이 개인인증 알고리즘이다. 이 방법의 타당성을 검증하기 위해 9명의 피험자를 모집하여 실험하였다. 9명의 피험자는 모두 사용자 등록 알고리즘을 시행하고, 그 중 같은 조건에서 참여 가능한 5명의 피험자에 대하여 개인인증을 구현하였다. 총 5명중 4명이 개인인증에 성공하였다. 연구결과를 바탕으로 PPG를 이용한 개인인증 기술이 기존의 생체인증 기술의 단점을 보완하는 방법이 되리라 기대된다. Biometrics are widely used in terms of the personal authentication and the security of personal data. However, there are several drawbacks of the biometric identification. In this study, we propose a personal authentication method using photoplethysmography (PPG) as biometric identification to solve this problem. The proposed method is consist of user registration algorithm and personal authentication algorithm. Six feature parameters extracted from measured PPG are stored in the database using the user registration algorithm. Subsequently, a comparative analysis of newly extracted features and the database to recognize the same person based the personal authentication algorithm. To test the validity of these algorithms, an experiment was performed on a group of 9 subjects for the user registration algorithm and on the only 5 subjects for the personal authentication algorithm. The result with a successful number of 4 out of the 5 subjects shows that the proposed personal authentication using PPG can be used as biometric method compensating the conventional methods’ drawbacks.
하악 구치부에서 ITI SLA (Sand-blasted, Large-grit, Acid-etched) 임플란트를 이용한 단일 치아 수복의 후향적 임상 연구
이승문,채경준,정의원,김창성,최성호,조규성,김종관,채중규,Lee, Seung-Mun,Chae, Gyung-Joon,Jung, Ui-Won,Kim, Chang-Sung,Choi, Seong-Ho,Cho, Kyoo-Sung,Kim, Chong-Kwan,Chai, Jung-Kyu 대한치주과학회 2006 Journal of Periodontal & Implant Science Vol.36 No.3
The purpose of this study was to evaluate cumulative survival rate (CSR, %) of mandibular posterior single tooth implants replaced with ITI SLA (sand-blasted, large-grit, acid-etched) implant system and compare the CSR between first and second molar. The findings from the results were as follows; 1. Total of 158 implants were inserted into 147 patients. 68 patients were males, 79 patients were females and their mean age was 47.8 years. 98 implants were placed in first molar area and 60 implants were placed in second molar area. In terms of diameter, implants with wide diameter over 4.8mm dominated (91.1%). Implants with length over lOmm were used (96.2%). 2, In the two cases, there was a slight transient numbness which recovered within 1-2 months. Nine SynOcta screw type abutments demonstrated screw loosening, There were ten cases of crown fallen-out from decementation. 3. Only one failed out of 158 implants. The CSR was 99.4%. The CSRs for first molar and second molar were 99% and 100%, respectively. From the results, it was concluded that single tooth replacement implant in the mandibular posterior area, might be considered as the effective treatment modality comparable to the conventional crown and bridge.
출혈성 신증후군 환자의 혈장 Atrial Natriuretic Polypeptide 농도 변화
박정의(Jeong Euy Park),차대룡(Dae Ryong Cha),김종웅(Jong Woong Kim),표희정(Heui Jung Pyo),이호왕(Ho Wang Lee),문정식(Jung Sik Moon),황흥곤(Heung Kon Hwang),김대중(Dai Joong Kim) 대한내과학회 1991 대한내과학회지 Vol.41 No.2
Hemorrhagic fever with renal syndrome (HFRS) is characterized clinically by acute renal failure and pathologically by dense hemorrhage in the right atrium and medulla of the kidneys. To investigate whether there is any significant relationship between the changes of plasma atrial natriuretic polypeptide (ANP) and the clinical course, the plasma ANP was measured in 21 patients with HFRS. The plasma ANP was normal to low during the early oliguric phase (94.6±37.0 pg/ml), went up to a very high level (292.4±190.4 pg/ml) at the beginning of diuresis, then fell to a near normal level in a few days. The plasma renin activity (PRA) was very high during the early oliguric phase and fell rapidly in an opposite direction to the plasma ANP as the patients began diuresis. The rapid increase of plasma ANP and decrease of PRA seem to play an important role in the beginning of diuresis in HFRS.
한국형 출혈열 환자에서 병기에 따른 혈중 Atrial Natriuretic Polypeptide 농도의 변화
박정의(Jeong Euy Park),송치욱(Chi Wook Song),송관규(Gwan Gyu Song),표회정(Heui Jung Pyo),박승철(Seung Chull Park),이창홍(Chang Hong Lee),김대원(Dae Won Kim),이갑노(Kap Ro Lee),양영선(Yung Sun Yang),황흥곤(Heung Kon Hwang),문정식(Jung 대한내과학회 1987 대한내과학회지 Vol.33 No.6
N/A The plasma atrial naturiuretic polypeptide (ANP) was repeatedly measured in each clinical phases in 20 patients (20.8±7.2yr) with Korean Hemorrhagic Fever (KHF). The study purpose was to see whether there is any relationship between the clinical course of KHF and the changes of plasma level of ANP. In three patients the plasma ANP could be repeatedly measured from the early oliguric to diruetic phases. In these three patients the plasma level of renin activity and aldosterone were very high in the early oliguric phase. Then the plasma renin activity and aldosterone level decreased steeply in remarkable degree to near normal level while the patient is still in oliguric phase and stayed at this level during the diuretic phase. The plasma ANP level was low (30-80pg/ml) in the early oliguric phase. Then with the sudden remarkable decrease of plasma renin activity and aldosterone the plasma ANP increased rapidly to high level (230-280pg/ml), then was decreased to near normal level (90-190pg/ml) making a narrow peaked plasma ANP concentration curve, and then the level stayed at near normal level during the diuretic phase. Around the time when the plasma renin activity and aldosterone concentrations were decreased to their low level and the plasma ANP was increased to it's peak level the oliguric phase was changed to the diuretic phase. The changes of plasma cortisol level followed the pattern of changes of plasma renin and aldosterone. It is possible that the increase of plasma ANP level might have had some role in the initiation of diuretic phase in these patients. It is not certain whether these changes are the unique changes seen only in patients with KHF or the changes seen also in patients with acute renal failure of other causes.
수면중 호흡수 모니터링을 위한 광삼각 측량 기법을 이용한 비전기반 비접촉식 측정 시스템에서 환경변화에 강인한 레이저 영역 분할 영상처리 알고리즘
정유수(Y. S. Jeong),정의성(E. S. Jung),이호열(H. Lee),박영상(Y. S. Park),송찬호(C. Song),문효정(H. Moon),손재범(J. Son) 한국재활복지공학회 2020 재활복지공학회논문지 Vol.14 No.4
본 논문은 침대에 누워 있는 사람을 대상으로 광삼각 측량 기법에 기반한 비접촉, 무구속 호흡 측정을 위한 시스템을 연구함에 있어 환경변화에 강인한 레이저 영역 분할 영상처리 알고리즘을 제안한다. 해당 시스템은 하나의 침대와 카메라 및 라인레이저로 이루어져있으며 카메라와 라인레이저는 각각 침대의 상단부와 하단부에서 침대 중앙을 향해 조사된다. 사람의 상반신에 반사된 라인 레이저의 빛을 카메라에서 촬영하여 광삼각 측량 기법을 적용하였다. 이때 레이저는 사람의 상반신의 높이를 측정할 수 있는 측정자이며 상반신의 높이변화를 관측하여 호흡수를 측정한다. 본 논문에서는 정확한 호흡수를 측정하기 위해 영상 내 레이저 영역을 견실히 추출할 수 있는 환경변화에 강인한 레이저 영역 분할 영상처리 알고리즘을 제안한다. 시험을 통해 제안하는 알고리즘이 환경 변화에 강인한 알고리즘임을 검증한다. This paper proposes a laser segmented image processing algorithm that is robust against environmental changes in researching a system for measuring non-contact, non-constrained breathing based on optical triangulation techniques for people lying in bed. The system consists of a bed, a camera and a line laser, and the camera and line laser are irradiated from the upper and lower parts of the bed toward the center of the bed, respectively. The optical triangulation technique was applied by measuring the light of the line laser reflected on the upper body of a person with a camera. At this time, the laser is a measurer that can measure the height of a person"s upper body and measures the respiration rate by observing the height change of the upper body. In this paper, we propose a laser region segmentation image processing algorithm that is robust against environmental changes that can reliably extract the laser region in the image to measure the accurate respiration rate. Through clinical trial, we verify that the proposed algorithm is robust against environmental changes.