• Journal of Oral Medicine and Pain
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• 제38권3호
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• pp.235-246
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• 2013

법치의학적 연령 감정은 개인 식별에 있어 중요한 역할을 한다. 본 연구는 한국 연령 감정 대상자들의 사회적 특성을 분석하는 것을 목적으로 한다. 2012년 3월부터 2013년 3월까지 경북대학교 치과병원 구강내과에 연령 감정을 의뢰한 대상자들에게 설문조사를 실시하였다.결과는 다음과 같다: 1. 성별 분포에서, 남성(42.86%)보다 여성(57.14%)이 더 많았다. 50대와 60대 이상의 고령자가 대다수였으며(89.28%), 40대 아래로는 한 명의 의뢰인도 없었다. 의뢰인들의 대부분이 초등학교 졸업 이하의 학력을 가지고 있었다(69.64%). 2. 호적 상 연령과 의뢰인이 주장하는 연령 간의 차이가 나게 된 가장 큰 이유로는 가족 및 친척의 실수로 인한 것이 가장 많았다(80.36%). 연령 감정을 통해 얻고자 하는 목적은 사회 복지 혜택(62.50%), 사회적 인관 관계 문제(12.50%), 단지 바른 나이를 찾기 위해서(10.71%), 직업과 관련한 문제(8.93%) 순이었다. 3. 연령 감정을 하기 위해 치과(구강내과)를 찾게 된 경로로는 관공서의 비중이 높았으며(48.21%), 친구나 지인(21.43%), 대중매체(14.29%), 병의원(10.71%) 등을 통한 경로가 뒤를 이었다. 법치의학적 연령 감정에 대한 의뢰인들의 이해도는 10점 만점에 7.03점으로 높은 수준이었다. 절반 이상의 의뢰인들에게서 현재의 연령 감정 비용에 대해 만족하는 것으로 나타났다. 4. 법치의학적 연령 감정을 통해 감정된 연령과 의뢰인들이 주장하는 연령 간에는 57.14%의 근접도를 보였다. 1년 간 조사한 연령 감정 대상자들의 23.53%가 법적으로 연령 정정을 하게 되었다.

• Asian Pacific Journal of Cancer Prevention
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• 제13권7호
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• pp.3229-3232
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• 2012

In this study, cancer incidence data were assessed to provide various rates of five year age groups for a given year, lying between two census years. The individual exponential growth rate method is most useful in both population-based and non-population cased cancer registries in India to estimate the population by five yearly age groups and also find the rates of crude rates, age standard rates and cumulative rates. This method has been shown to endure from bias and often results sacrificing the overall growth rate and correction factor must be needful in five year age group population to maintain it. A second method, the difference distribution method is also able to maintain the overall growth rate and overcome the bias in estimation of five yearly age group populations. From this point of view these methods serving a new technique for population estimation by five yearly age groups for inter census years.

• 한국건축시공학회지
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• 제7권1호
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• pp.71-77
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• 2007

This paper is to investigate the effect of the curing temperature on strength development of concrete incorporating cement kiln dust(CKD) and blast furnace slag (BS) quantitatively. Estimation of the compressive strength of the concrete was conducted using the equivalent age equation and the rate constant model proposed by Carino. Correction of Carino model was studied to secure the accuracy of strength development estimation by introducing correction factors regarding rate constant and age. An increasing curing temperature results in an increase in strength at early age, but with the elapse of age, strength development at high curing temperature decreases compared with that at low curing temperature. Especially, the use of BS has a remarkable strength development at early age and even at later age, high strength is maintained due to accelerated pozzolanic activity resulting from high temperature. Whereas, at low curing temperature, the use of BS leads to a decrease in compressive strength. Accordingly, much attention should be paid to prevent strength loss at low temperature. Based on the strength development estimation using equivalent age equation, good agreements between measured strength and calculated strength are obtained.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2017년도 춘계학술대회
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• pp.779-782
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• 2017

OpenBR은 안면인식 관련 새로운 방식의 연구, 기존 알고리즘 개선, 상용 시스템과 상호 작용, 인식 성능 측정, 자동화 된 생체 인식 시스템을 배치하기 위한 프레임 워크입니다. 신속한 알고리즘 프로토타이핑을 용이하게 하기 위해 고안되었으며 성숙한 핵심 프레임 워크, 유연한 플러그인 시스템 및 개방형 및 폐쇄형 소스 개발 지원을 특징으로 한다. 기성의 알고리즘은 얼굴 인식, 연령 산정 및 성별 추정과 같은 특정 양식에 대해서도 사용할 수 있다. 본 논문에서는 OpenBR의 프레임 워크의 구성방법에 대해서 기술하고 지원되는 프로그램을 통해서 이용한 안면인식, 성별추정, 나이추정 구현하고 기술하였다.

• 전기학회논문지
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• 제67권9호
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• pp.1224-1231
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• 2018

Automatic age estimation has been used in many social network applications, practical commercial applications, and human-computer interaction visual-surveillance biometrics. However, it has rarely been explored. In this paper, we propose an automatic age estimation system, which includes face detection and convolutional deep learning based on an inception module. The latter is a 22-layer-deep network that serves as the particular category of the inception design. To evaluate the proposed approach, we use 4,000 images of eight different age groups from the Adience age dataset. k-fold cross-validation (k = 5) is applied. A comparison of the performance of the proposed work and recent related methods is presented. The results show that the proposed method significantly outperforms existing methods in terms of the exact accuracy and off-by-one accuracy. The off-by-one accuracy is when the result is off by one adjacent age label to the above or below. For the exact accuracy, the age label of "60+" is classified with the highest accuracy of 76%.

• 한국멀티미디어학회논문지
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• 제12권3호
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• pp.383-396
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• 2009

뼈 나이 측정은 소아의 내분비계 관련 질병 진단을 위해 소아과에서 널리 사용되는 방법이다. 그러나 전문 인력이 부족하여 자동화된 측정 방법에 대한 꾸준한 요구가 있었다. 따라서 본 논문에서는 패턴 인식기법을 이용한 자동화된 뼈 나이 측정 알고리즘을 제안한다. 제안하는 알고리즘은 X-ray 영상에서 손가락뼈의 각 부분을 자동으로 분류하는 과정과 분류된 뼈 영상으로부터 정규화된 형상 모델을 추출하는 과정, 그리고 정규화된 형상 모델로부터 뼈 나이를 측정하는 과정으로 구성된다. 제안하는 알고리즘은 능동 형상 모델(Active Shape Model: ASM)을 이용하여 나이 측정에 사용되는 특정값 추출의 정확도를 향상시켰으며, 뼈 나이 분류를 위해 사용된 Support Vector Machine(SVM)의 입력으로 정규화된 형상 모델로부터 얻어진 각 뼈의 크기와 비율을 특징값으로 사용하였다. 성능 평가를 위해서 한양대학교 부속병원에서 제공한 영상에 대해 전문가가 평가한 나이와 제안한 알고리즘을 이용하여 측정된 나이를 통계적으로 비교 분석하였다. 실험을 통하여 본 논문에서 제안한 특징값과 알고리즘으로 뼈 나이를 진단한 결과, 전문가에 의한 결과와 평균 0.679살의 오차 이내의 뛰어난 뼈 나이 측정 성능을 보였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2001년도 봄 학술발표회 논문집
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• pp.397-402
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• 2001

Microstructural characteristics such as hydrates and porosity greatly influence the development of concrete strength. In this study, a strength estimation model for early-age concrete considerig, the microstructural characteristics was proposed, which considers the effects of both an increment of degree of hydration and capillary porosity on a strength increment. Hydration modeling and compressive strength test with curing temperature and curing ages were carried out. By comparing test results with estimated strength, it is found that the strength estimation model can estimate compressive strength of early-age concrete with curing ages and curing temperature within a margin of error.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제1권1호
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• pp.83-104
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• 1997

This paper studies parameter estimation for a first-order hyperbolic integro-differential equation modelling one-sex population dynamics. A second-order finite difference scheme is used to estimate parameters such as the age-specific death-rate and the age-specific fertility from fully discrete observations on the population. The function space parameter estimation convergence of this scheme is proved. Also, numerical simulations are performed.

• Journal of Oral Medicine and Pain
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• 제40권4호
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• pp.146-154
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• 2015

Purpose: The purpose of present study was to develop a method for assessing the chronological age of Korean adults based on the relationship between age and size of pulp cavity using dental radiographs of mandibular first molars. Methods: A total of 325 dental radiographs of Korean adults with known age and gender were selected for the study (199 males and 126 females) which were taken in the period between January 2009 and June 2014 at the Pusan National University Dental Hospital. The measurements were carried out on both orthopantomographs (OPGs) and intraoral periapical radiographs of mandibular first molar and the following ratios were calculated: pulp chamber floor height ratio (F/L), pulp chamber ceiling height ratio (R/L), and pulp chamber depth ratio (D/L). Results: The ratios of measurements on intraoral periapical images of mandible first molar generally produce more reliable data than the measurements on OPGs. The pulp chamber floor height ratio and pulp chamber thickness ratio showed significant correlation with age, whereas the pulp chamber ceiling height ratios showed weak correlation with age. It was found that the best correlations between the ratios and age were found for pulp chamber thickness ratios (r=-0.731 to -0.751). The multiple regression models were derived using 3 ratios that were significantly correlated with age. The determination coefficients ($R^2$) of the models ranged from 0.556 to 0.596. Conclusions: Our results indicate that the pulp chamber thickness and pulp chamber floor height in mandibular first molar are an age-dependent variable in adults which can be used to estimate age with reasonable accuracy. The higher image quality of dental radiographs will probably narrow the age estimation error and improve dental age estimation.

• Clinical and Experimental Otorhinolaryngology
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• 제11권4호
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• pp.301-308
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• 2018

Objectives. The age-based Cole formula has been employed for the estimation of endotracheal tube (ETT) size due to its ease of use, but may not appropriately consider growth rates among children. Child growth is assessed by calculating the body surface area (BSA). The association between the outer diameter of an appropriate uncuffed-endotracheal-tube (ETT-OD) and the BSA values of patients at 24-96 months of age was our primary outcome. Methods. Cole formula, BSA, age, height, weight and ultrasound measurement of subglottic-transverse-diameter were evaluated for correlations with correct uncuffed ETT-OD. The Cole formula, BSA, and ultrasound measurements were analyzed for estimation rates in all patients and age subgroups. The maximum allowed error for the estimation of ETT-OD was ${\leq}0.3mm$. Patients' tracheas were intubated with tubes chosen by Cole formula and correct ETT-OD values were determined using leak test. ETT exchange rates were recorded. Results. One-hundred twenty-seven patients were analyzed for the determination of estimation rates. Thirteen patients aged ${\geq}72months$ were intubated with cuffed ETT-OD of 8.4 mm and were accepted to need uncuffed ETT-OD >8.4 mm in order to be included in estimation rates, but excluded from correlations for size analysis. One-hundred fourteen patients were analyzed for correlations between correct ETT-OD (determined by the leak test) and outcome parameters. Cole formula, ultrasonography, and BSA had similar correct estimation rates. All three parameters had higher underestimation rates as age increased. Conclusion. The Cole formula, BSA, and ultrasonography had similar estimation rates in patients aged ${\geq}24$ to ${\leq}96months$. BSA had a correct estimation rate of 40.2% and may not be reliable in clinical practice to predict uncuffed-ETT-size.