• Asian Pacific Journal of Cancer Prevention
• /
• 제15권3호
• /
• pp.1327-1331
• /
• 2014

Background: Electrical impedance tomography (EIT) is a new non-invasive, mobile screening method which does not use ionizing radiation to the human breast; allows conducting quantitative assessment of the images besides the visual interpretation. The aim of this study was to correlate the quantitative assessment and visual interpretation of breast electrical impedance tomographs and associated factors. Materials and Methods: One hundred and fifty mammography patients above 40 years and undergoing EIT were chosen using convenient sampling. Visual interpretation of the images was carried out by a radiologist with minimum of three years experience using the breast imaging - electrical impedance (BI-EIM) classification for detection of abnormalities. A set of thirty blinded EIT images were reinterpreted to determine the intra-rater reliability using kappa. Quantitative assessment was by comparison of the breast average electric conductivity with the norm and correlations with visual interpretation of the images were determined using Chi-square. One-way ANOVA was used to compare the mean electrical conductivity between groups and t-test was used for comparisons with pre-existing Caucasians statistics. Independent t-tests were applied to compare the mean electrical conductivity of women with factors like exogenous hormone use and family history of breast cancer. Results: The mean electrical conductivity of Malaysian women was significantly lower than that of Caucasians (p<0.05). Quantitative assessment of electrical impedance tomography was significantly related with visual interpretation of images of the breast (p<0.05). Conclusions: Quantitative assessment of electrical impedance tomography images was significantly related with visual interpretation.

• 한국보육지원학회지
• /
• 제9권2호
• /
• pp.263-283
• /
• 2013

본 연구는 Greimas 기호학적 방법을 사용하여 그림책 "누가 내 머리에 똥 쌌어?"에 내포된 심층의미를 분석한 후 텍스트에서 생성된 의미가 아동발달과 연관성이 있는가를 탐색하고자 하였다. 텍스트에 내재된 심층의미를 분석한 결과 사회적으로 바람직하다 인정된 배변규범이 전제되었으며, 배변규범을 준수하는 과정에 발생하는 갈등과 불안과 심리적 안정을 제공하는 내용을 담고 있었다. 또한 의미생성과정인 기호작용과 인지발달이 유사한 맥락이 있는가를 확인하기 위해 기호사각형 모델을 적용하여 그림책의 의미생성과정을 분석하였을 때 사고의 확장을 가능하게 하는 의미가 생성됨을 확인하였다. 이는 Piaget의 인지발달 주요개념인 도식, 동화, 조절이라는 의미와 같은 맥락이라 보았다. 따라서 연구 텍스트는 배변과 관련하여 심리적인 측면과 인지적인 측면에서 아동의 발달과 연관성이 있는 내용을 내포하고 있음을 확인하였다.

• 농촌의학ㆍ지역보건
• /
• 제32권3호
• /
• pp.117-124
• /
• 2007

Objectives: This study was conducted to investigate how willingness to have an additional childbirth was related to mother's general characteristics and various reasons for avoiding an additional childbirth. Methods: By using organized questionnaire, we had face-to-face interviews with 722 mothers who had 12 to 36 months child in a urban-rural area of Chungcheongnam-do from 14 February to 19 February in 2005. Questionnaires included general characteristics composed of age, monthly income, number of children, major carers and mother's job status, and 6 reasons for avoiding an additional childbirth. We performed chi-square test and multiple logistic regression analysis. Results: Of 722 mothers, 66.5% had no willingness to have an additional childbirth. In the multiple logistic regression analysis, old age of mother(95% CI of OR: 1.084-1.190), two or more children(95% CI of OR: 6.97-15.602) and weak norm about need for a child(95% CI of OR: 1.633-29.352) were independent related factors with willingness to have an additional childbirth. Conclusions: In our study, 2/3 women who already had children were appeared to have no willingness to have additional childbirth. Policies about family planning and controlling birth rate should be focused on eliminating barrier to additional childbirths.

• 물과 미래
• /
• 제23권3호
• /
• pp.319-328
• /
• 1990

2차원 하구모델의 매개변수 동정을 BF좌표계로 변환된 ADI-FDM출력 수치모형을 사용하여 수행하였다. 모형에서 기본 방정식을 동수역학식과 수송방정식이 복합된 방정식을 사용하였다. Thompson식이 지배방정식을 사각평면으로 변환 하는데 사용도이ㅓㅆ으며 Thompson의 Elliptic 격자발생기법이 BF 좌표계에서 곡선격자망을 발생하는데 사용되었다. 지배방정식에서 동정될 매개변수는 마찰계수와 분산 정수이다. 출력수치모형은 BF좌표계에서 조석평균 염도 모형이 사용되었다. 최적화 기법으로 영향계수 알고리즘을 적용하였다. 또한 Lumped 모형이 동정에 고려 되었다. 본 연구는 새로운 출력 수치모형이 하구염도 모형의 매개변수 동정에 있어 유용한가를 검토 하는데 중점을 두었다. 제안된 기법은 간단한 가상모형에 실험적인 적용을 통하여 검토되었다. 검토한 결과는 제안된 기법이 하구모형에서 매개변수 동정시 도입될 수 있음을 보여주었다.

• 한국근적외분광분석학회:학술대회논문집
• /
• 한국근적외분광분석학회 2001년도 NIR-2001
• /
• pp.1041-1041
• /
• 2001

Removal of variability in spectra data before the application of chemometric modeling will generally result in simpler (and presumably more robust) models. Particularly for sparsely sampled data, such as typically encountered in diode array instruments, the use of Savitzky-Golay (S-G) derivatives offers an effective method to remove effects of shifting baselines and sloping or curving apparent baselines often observed with scattering samples. The application of these convolution functions is equivalent to fitting a selected polynomial to a number of points in the spectrum, usually 5 to 25 points. The value of the polynomial evaluated at its mid-point, or its derivative, is taken as the (smoothed) spectrum or its derivative at the mid-point of the wavelength window. The process is continued for successive windows along the spectrum. The original paper, published in 1964 [1] presented these convolution functions as integers to be used as multipliers for the spectral values at equal intervals in the window, with a normalization integer to divide the sum of the products, to determine the result for each point. Steinier et al. [2] published corrections to errors in the original presentation [1], and a vector formulation for obtaining the coefficients. The actual selection of the degree of polynomial and number of points in the window determines whether closely situated bands and shoulders are resolved in the derivatives. Furthermore, the actual noise reduction in the derivatives may be estimated from the square root of the sums of the coefficients, divided by the NORM value. A simple technique to evaluate the actual convolution factors employed in the calculation by the software will be presented. It has been found that some software packages do not properly account for the sampling interval of the spectral data (Equation Ⅶ in [1]). While this is not a problem in the construction and implementation of chemometric models, it may be noticed in comparing models at differing spectral resolutions. Also, the effects on parameters of PLS models of choosing various polynomials and numbers of points in the window will be presented.

• 한국환경과학회지
• /
• 제13권1호
• /
• pp.99-107
• /
• 2004

This research is to determine the level of environmental pollution at a blasting construction area which is the origin of noise, vibration, and suspended particle, and to compare the results with other domestic and international standard data. This experiment is also to find out the effects resulting from blasting construction and to propose a plan that can decrease environmental pollution. The blasting construction area is a factory site which is about one and half million square meter and sewage disposal plant is about ninety thousand square meter. Both were selected as the areas for the tests to be conducted in determination test. The test to determine the level of noise, vibration, and total suspended particle was conducted thirty times around the blasting construction area by comparing measurement results and numerical analysis. However, as the test was not conducted in the laboratory but in the actual blasting construction area, it was not possible to do the test with the same exact conditions each true. Therefore, the test was not ideal as conditions could change from test to test. For the most part, the level of noise was below the standard level of 70dB. Every vibration test was under the standard limitation. For example, a house, 200m away was tested for noise and vibration and the level was found to be under the 0.2 cm/sec which is the standard for specialty designed cultural sites., i.e very low level. Also a buried oil pipeline that was 30m away also marked under 2.0cm/sec which is the norm for an industrial area. However, if there were an oil pipeline under the house, the amount of charging gunpowder per hole should be decreased compared to the amount used in the test. The test result for suspended particles under the standard limitation which is 24hour average 300$\mu\textrm{g}$/㎥ at a distance from blasting wavelength, but at detonator, total suspended particle from the blast origin exceeded the standard limitation. If explosion occurs when it detonates in the hole, most of the energy would be absorbed in the crushing of rocks, but some remaining energy would make noises and vibration inevitable. So the important thing is how to minimize the environmental pollution from the blasting. There should be regulations in order that the standard limitation is not exceeded, and to decrease the environmental pollution from the blasting.

• 응용통계연구
• /
• 제30권5호
• /
• pp.733-745
• /
• 2017

국소복합분위수 회귀모형을 활용한 비모수적 함수 추정방법이 높은 효율성과 더불어 활발히 연구되고 있다. 이러한 추정과정에 커널을 사용한 자료 평활방법이 대표적으로 사용되고 있으며, 그 성능은 커널보다는 평활계수의 선택 크게 의존한다. 한편, 회귀함수 추정방법의 성능을 평가하는 기준으로는 통상적으로 $L_2$-노름이 사용되어 평균제곱오차 또는 평균적분제곱오차를 최소화하는 평활계수의 선택에 대한 많은 연구가 진행되어 왔다. 본 논문에서는 국소선형 복합 분위수 회귀방법을 활용한 비모수 회귀모형 추정량의 성능을 결정하는 평활계수 선택의 최적성에 관해 연구하였다. 특히, 여러 장점을 가졌으나 수리적 어려움으로 연구가 미흡한 평균절대오차 및 평균적분절대오차를 최적의 기준으로 삼아 최적의 평활계수를 구하고 그 유일성에 관해 연구하였다. 나아가 기존의 평가기준인 평균제곱오차 및 평균적분제곱오차를 사용한 선택과의 관계를 파악하고 그 성능을 비교하였다. 이러한 과정에서 다양한 상황에서의 모의실험을 통해 제안한 방법의 특성을 규명하였다.

• 대한간호학회지
• /
• 제21권3호
• /
• pp.365-382
• /
• 1991

This study was designed to measure the physical, mental-emotional and social health status of elderlies according to rural areas, medium - small cities, and large city environment. Data collection was done from July 18 to August 17 1990. The subjects were a convenience sample after their place of residence was stratified into large, medium- small cities and rural areas. Those who attended elderly centers in Seodaemun, Mapo, and Kangnam districts in Seoul were considered to be residents of a large city and interviewed by trained research assistants and student nurses. Elderlies living in Chungju, Jinju, Chuncheon, and Jeonju cities were coded as residents of medium-small cities and were interviewed by professors of nursing colleges. Rural residents were interviewed by the community health practioners working in community health clinics in North and South Kyongsang, North and South Jeolla, and Kyonggi provinces. The tool used in this study was the health assessment tool developed by Choi, Young Hee in 1990. This tool was organized into 20 physical health status, 17 mental - emotional health status, and 37 social health ststus items. Physical health status items consisted of six factors - personal hygiene activity ability, external activity utilizing traffic, mass media, and spare time ability, sexual ability, digestive system related ability, sexual ability, sensory ability, and elimination ability. Mental - emotional health status items consisted of two factors - mental health factor and emotional health factor. Social health status items consisted of seven factors -grandparental role ability, parental role ability, spoused role ability, friendship role ability, kinship role ability, group member role ability, and religious believer role ability. Data Analysis included frequencies, percentage, mean, standard deviation, ANOVA, and chi - square test. The results of the analysis are as follows : 1. The mean physical health status score for large city residents was 4.1132, for rural residents 4.0787, and for medium and small city residents 3.9565. There were significant differences according to residential area for personal hygiene activity ability, external activity ability, sexual ability, and digestive system related ability items 2. The mean mental -emotional health status score for rural residents was 3.8291, for medium and small city residents 3.7967, and for large city residents 3.7807. There was a significant difference according to residential area in the mental health ability item. 3. The mean social health status score for medium and small city residents was 3.0000, for rural residents 2.9362, and for large city residents 2.8960. There were significant differences according to residential area for kinship role ability and religious believer role ability items. The following conclusion was derived from the above results 1. The physical health status of elderlies residing in medium - small cities and in rural areas was lower than that of those residing in Seoul, a large urban area. Therefore, more medical facilities are needed in rural area so as to monitor their health, prevent disease, and promote their health. 2. The mental -emotional ststus and social health status of elderlies residing in the large city were lower than that of those residing in medium - small cities and rural areas. This may reflect weakening of the strong traditional family bond that may happen with urbanization. Continued support for elderly parents is essential and education should emphasize the traditional cultural norm and value of filial piety. 3. Facilities and programs for elderly are needed so that they may spend their time more valuably in their urban environment.

• 경영정보학연구
• /
• 제18권4호
• /
• pp.17-42
• /
• 2016

금융회사의 정보보안사고는 정당한 접근 권한을 가진 내부자에 의해 발생하는 사례가 증가하고 있으며, 특히 외주직원에 의한 사고가 증가하고 있다. 금융회사의 외주용역 증가에 따라, 내부자 위협관점에서 정당한 권한을 가진 외주직원은 조직의 정보보안정책을 위반할 수 있는 위협적인 존재가 되고 있다. 본 연구의 목적은 내부직원과 외주직원의 차이를 분석하고 정보보안정책의 위반요인을 확인하여 금융회사의 정보보안정책이 바르게 작용할 수 있도록 하기 위함이다. 금융회사 조직원의 정보보안정책에 대한 위반요인에 대해 계획된 행동이론, 일반억제이론 및 정보보안인식을 기초하여 연구모형을 설계하고, 내부직원과 외주직원 간의 차이를 분석하였다. 분석에 사용된 설문은 온라인과 오프라인으로 수집된 363개의 샘플이 사용되었으며, 그룹 간 차이를 분석하기 위해 내부직원 246명(68%)과 외주직원 117명(32%)을 두 그룹으로 나누어 다중 집단 분석을 이용하였다. 차이 분석을 수행한 결과, 외주직원은 내부직원과 달리 정보보안정책에 대한 위반의도가 정보보안정책에 대한 주관적규범에 영향을 받지 않고 정보보안정책에 대한 행동통제에 영향을 받아 억제되는 것으로 나타났다. 이는 외주직원은 자신이 스스로 할 수 있다고 여기는 자기효능감과 같은 요인에 의해 정보보안정책에 대한 위반의도가 통제되는 것을 나타내는 것이며, 외주직원관리에 이를 응용하여 정보보안교육을 내부직원과 달리 정보보안정책에 대한 조직의 기대를 강조하기보다는 스스로 지킬 수 있을 정도로 외주직원이 기술을 가지고 있음을 강조하고 쉽게 지킬 수 있다는 것을 강조하면 더욱 효과적일 것이다. 결론적으로 금융회사의 외주직원에 대한 정보보안교육 프로그램은 정보보안정책에 대한 이해도를 높일 수 있도록 하여야 하며, 외주직원관리에서는 외주직원이 스스로 지킬 수 있도록 쉬운 보안체계를 유지하는 것이 효과적이라 할 수 있다.