• Journal of radiological science and technology
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• v.45 no.5
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• pp.397-405
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• 2022

Computed radiography (CR) systems, which convert an analog signal recorded on a cassette into a digital image, combine the characteristics of analog and digital imaging systems. Compared to digital radiography (DR) systems, CR systems have presented difficulties in evaluating system performance because of their lower detective quantum efficiency, their lower signal-to-noise ratio (SNR), and lower modulation transfer function (MTF). During the step of energy-storing and reading out, a baseline offset occurs in the edge area and makes low-frequency overestimation. The low-frequency offset component in the line spread function (LSF) critically affects the MTF and other image-analysis or qualification processes. In this study, we developed the method of baseline correction using mathematical morphology to determine the LSF and MTF of CR systems accurately. We presented a baseline correction that used a morphological filter to effectively remove the low-frequency offset from the LSF. We also tried an MTF evaluation of the CR system to demonstrate the effectiveness of the baseline correction. The MTF with a 3-pixel structuring element (SE) fluctuated since it overestimated the low-frequency component. This overestimation led the algorithm to over-compensate in the low-frequency region so that high-frequency components appeared relatively strong. The MTFs with between 11- and 15-pixel SEs showed little variation. Compared to spatial or frequency filtering that eliminated baseline effects in the edge spread function, our algorithm performed better at precisely locating the edge position and the averaged LSF was narrower.

• The Journal of Korean Academy of Sensory Integration
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• v.11 no.1
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• pp.39-49
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• 2013

Objective : We studied adolescent's sensory processing characteristics and classification of the depending on the adolescent's sensory processing characteristics degree. And we studied depending on sensory processing characteristics the difference of the general characteristics; sex, health status, hospital visit, the usual sensory problem. In addition, we investigated differences in each group; sensory processing characteristics, stress, depression, and self-esteem. Methods : We have collected 310 for students in Busan, Gyeongsangnam-do region of high school to distribute the questionnaire; Adolescent / Adult sensory profile (AASP), the Korean version Daily Stress Assessment (K-DSI), Beck Depression Inventory (BDI), and Self-Esteem Scale (SES). The questionnaire used in the final study part 310 to part 288 of which corresponds to 92% of the total questionnaire. The data analysis was used SPSS for windows 18.0 statistical analysis. Results : Sensory Seeking of sensory processing characteristics of adolescents in the study was low score. The higher stress score, Sensory Sensitivity and Sensation Avoiding score were higher, and the higher depression score, Low Registration and Sensation Avoiding score were higher. The lower self-esteem score, Sensation Avoiding and Sensory Sensitivity score was higher whereas Sensation Seeking score was lower. Conclusions : Study about Korean's mean in the next studies should be investigate. In addition, a lot of study about adolescents with sensory processing problems should be investigate.

• Journal of Nutrition and Health
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• v.37 no.4
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• pp.316-328
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• 2004

The objective of this study was to investigate the differences in food intake patterns by the economic status. Data from the 1998 Korean National Health and Nutrition Survey were used. Using the poverty line based on the 1998 Korean minimum cost of living, the subjects (n = 10400) were classified into high class (36.1%), middle class (40.7%) and low class (23.1%). Mean intakes for other food groups except grains, potatoes and vegetables became higher as the eco-nomic levels were going up. By the family size, it was found that intakes of grains and fishes were different (p<0.05). By the economic status, intakes of fruits (p<0.05), meats (p<0.05) and fishes (p<0.01) were different. There were no significant differences in consumed types of food by the economic status. Rice was the most prevalent food in all clas-ses and its intakes increased as the economic status was going down. In the dietary patterns of main food group (GMDVF: Grain, Meats, Dairy, Vegetable and Fruit), the pattern except dairy (11011) revealed the highest proportion in high-middle class while the patterns without dairy and fruit food groups (11010) had the highest proportion in low class. The propor-tions of subjects with the low dietary diversity score (DDS) increased as economic status was going down (p<0.01). The food groups that most people do not consume were the dairy and fruit group. Proportions of people who missed one or more group increased as economic status was going down. The high dietary variety score (DVS) also was linked to a high score on the DDS and high class (p＜0.01). Thus the intakes of the dairy and fruits product should be increased in all classes. The low class especially had worse quality of food intakes pattern than that of the high or middle class. The nutrition policy and education programs need to be established according to the economic status.

• Journal of Families and Better Life
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• v.14 no.4
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• pp.219-232
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• 1996

This study was investigated the perceived level of stress and the coping method which the adolescent were confronting. The subject of this investigation was high school students who resided in the City of Pusan. Life Event Scale and Coping Methods Scale were used as the methods for examination. The data were analyzed using M, SD, t-test one-way ANOVA scheffe-test and Pearson's correlation related with this study problem were tested. The results of this study are as follows: 1. The perceived level of teenager's stress was little low with M=1.65 When dividing sphere of perceived level the stress by school problem was the highest and the circumstance problem personal one family one and a companion one are followed in regular sequence. 2. It was found that degree of stress made a difference according to the sex course grade school year religion parents's presence or absence SES the satisfactory degree of school life the satisfactory degree of school life the satisfactory degree of home life and the rearing attitude of parents. 3. As the coping score of teenager's stress was M=2.54. The short-term coping method was higher compared with the long-term one regarding coping methods. 4. It was found that the coping method of stress differed from each other according to variables of sex school year the satisfactory degree of school life and the satisfactory degree of home life. 5. It was found that the perceived level of stress had negative correlation with the coping method and especially long-term coping method had higher negative correlation.

• Journal of the Korean Institute of Telematics and Electronics B
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• v.33B no.5
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• pp.41-51
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• 1996

In this paper, anew parallel processing system based on a cluster architecture which provides scalability of a parallel processing system while maintains shared memory multiprocessor characteristics is proposed. In recent days low cost, high performnce microprocessors have led to construction of large scale parallel processing systems. Such parallel processing systems provides large scalability but are mainly used for scientific applications which have large data parallelism. A shared memory multiprocessor system like TICOM is currently used as aserver for the commercial application, however, the shared memory multiprocessor system is known to have very limited scalability. The proposed architecture can support scalability and performance of the parallel processing system while it provides adaptability for the commerical application, hence it can overcome the limitation of the shared memory multiprocessor. The architecture and characteristics of the proposed system shall be described. A proprietary hierarchical crsossbar network is designed for this system, of which the protocol, routing and switching technique and the signal transfer technique are optimized for the proposed architecture. The design trade-offs for the network are described in this paper and with simulation usihng the SES/workbench, it is explored that the network fits to the proposed architecture.

• Journal of Advanced Marine Engineering and Technology
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• v.36 no.5
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• pp.595-602
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• 2012

In this study, for the purpose of reduction of $CO_2$ gas emission and to increase recovery of waste heat from ships, the ORC (Organic Rankine Cycle) is investigated and offered for the conversion of temperature heat to electricity from waste heat energy from ships. Simulation was performed with waste heat from the exhaust gasse which is relatively high temperature and cooling sea water which is relatively low temperature from ships. Various fluid is used for simulation of the ORC system with variable temperature and flow condition and efficiency of system and output power is compared. Finally, 2,400kW output power is obtained by system optimization of the preheater and reheater utilizing waste heat form sea water cooling system.

• Journal of Families and Better Life
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• v.8 no.1
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• pp.171-183
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• 1990

The purpose of this study is to search a tendency of marital stability, and to identify the variables influencing on marital stability of urban couples. The sample was selected from the married couples living is Seoul. Total sample consisted of 476 spouses(238 couples) finally selected datum sources. The data were analyzed by the statistical method such as the fator analysis, frequency distribution, percentile, ANOVA, Pearson's correlation, and χ2 test analysis. The main results were as follows ; 1) In general the score of marital stability of urban couples was somewhat high. 2) Among the related variables, socio-demographic variables such as Socio-Economic Status(SES), religion, social background have turned out to be significant on the marital stability, Also, marital satisfaction and attitude toward divorce influenced marital stability. 3) The important influential variables on the marital stability were in the order of marital satisfaction, attitude toward divorce, ears of marriage. 4) Four types of marital stability are identified based on marital satisfaction and attitude toward divorce. Among the surveyed couples, 39.7% showed the most ideal pattern in the sense that they show high scores on marital satisfaction and negative attitude toward divorce. On the other hand, 25.2% showed high psychological instability that they show low scores on marital satisfaction and positive attitude toward divorce. After all the most signigicant variable relating to marital stability was marital satisfaction.

• Korean Journal of Child Studies
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• v.31 no.4
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• pp.15-27
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• 2010

This study was conducted in order to identify the relationship between home literacy environment and mother's interactive teaching behaviors, and infant's vocabulary ability. The subjects of this study were 53 infants between the ages of 18 to 24 months and their mothers. In order to measure the home literacy environment, the questionnaire used by Han Chan-Hee (2006), which was partly modified from Shapiro (1979), was selected, and to analyze mothers' teaching behaviors, Barnard's NCAST Teaching Scale(1978) was used. The infant's vocabulary ability was measured by the questionnaire first used by Lim Yong-Soon(2002), which was partly modified from the MCDI used by Fenson et al(1991). In conclusion, this study, most importantly, suggests that the teaching behaviors of the mothers themselves as well as the home literacy environment can both be very important factors affecting infant vocabulary development.

• Journal of Veterinary Science
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• v.19 no.6
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• pp.725-734
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• 2018

Ovaries of 21 bitches presented with gynecopathies were surgically removed and histologically examined. Standard histological, as well as immunohistochemical, classification of 193 cystic structures resulted in the classification of 72 cysts of subsurface epithelial structures (SES), 61 follicular cysts (FCs), 38 cystic rete ovarii (CRO), 13 lutein cysts (LCs), and 9 non-classifiable cysts (NCCs). In addition to the histological classification, results were interpreted according to subject medical history, clinical examination outcome, and macroscopic observations during ovariohysterectomy. Dogs with ovarian cysts (OCs) and associated reproductive perturbations were mostly nulliparous, of large breed, and had an average of $9.5{\pm}3$ years. Prolonged or shortened inter-estrus intervals of past heats, however, seemed to be relatively low-risk factors for the development of OCs in dogs. Furthermore, we provide histological observations of a rarely seen canine LC including a degenerated oocyte in the central cavity.

• Asian Pacific Journal of Cancer Prevention
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• v.14 no.1
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• pp.589-594
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• 2013

Background: Prospective cohort studies to determine cofactors with oncogenic HPV-infections for cervical cancer are very rare from developing countries and such data are limited to the few screening trials. Large screening trials provide such data as a by product. Some of the cases are prevented by screening and do not surface as invasive cancers at all. Also, pre-invasive lesions are detected almost entirely by screening. Screening causes selection bias if attendance in or effectiveness of screening is correlated with the risk factors. The aim of this study was to quantify the influence of screening on risk factors for cervical cancer. Materials and Methods: Our material stems from a rural cohort of 80,000 women subjected to a randomised screening trial. The effect of screening on the incidence of cervix cancer was estimated with reference to socio-demographic and reproductive risk factors of cervical cancer. We compared these risks with the incidence of cancer in the randomised control population by the same determinants of risk. Results: The results in the screening arm compared to the control arm showed that the women of low SES and young age were benefitting more than those of high SES and old age. The relative risk by age (30-39 vs 50-59) was 0.33 in the control arm and 0.24 in the screening arm. The relative risk by education (not educated vs educated) was 2.8 in the control arm and 1.8 in the screening arm. The previously married women did not benefit (incidence 113 and 115 per 100,000 women years in control vs screening arms) whereas the effect was substantial in those married (86 vs 54). Conclusions: The results in controls were consistent with the general evidence, but results in attenders and nonattenders of the screening arm showed that screening itself and self-selection in attendance and effectiveness can influence the effect estimates of risk factors. The effect of cervical cancer screening programmes on the estimates of incidence of cervical cancer causes bias in the studies on etiology and, therefore, they should be interpreted with caution.