• Journal of the Microelectronics and Packaging Society
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• v.30 no.3
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• pp.73-77
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• 2023

In this study, we developed a Multi-level FeRAM (Ferroelectrics random access memory) device utilizing different ferroelectric materials and analyzed its operation through C-V analysis using simulations. To achieve Multi-level operation, we proposed an MFM (Multi-Ferroelectric Material) structure by depositing two different ferroelectric materials with distinct properties horizontally on the same bottom electrode and subsequently adding a gate electrode on top. By analyzing C-V peaks based on the polarization phenomenon occurring under different voltage conditions for the two materials, we confirmed the feasibility of achieving Multi-level operation, where either one or both of the materials can be polarized. Furthermore, we validated the process for implementing the proposed structure using semiconductor fabrication through process simulations. These results signify the significance of the new structure as it allows storing multiple states in a single memory cell, thereby greatly enhancing memory integration.

• Journal of Family Resource Management and Policy Review
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• v.10 no.1
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• pp.107-126
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• 2006

The purpose of this study was to investigate the relationships of married middle-aged men and women's gender-role identity, marital conflicts and psychological adjustment. Psychological adjustment was composed of mid life crisis, depression, and perceived happiness. The data of the study were collected from 397 married, middle aged men and women from 40 years to 59 years-old by using self-administered questionnaire method. The results showed that gender role identity was different according to sex. In addition, women's perceived level of marital conflict was found to be significantly different according to their gender role identity, indicating that androgynous women reported the lowest level of marital conflict. However, men's gender role conflict was not related to their marital conflict. Furthermore, men's psychological adjustment level was not different according to their gender role identity, while women's psychological adjustment differed, indicating that androgynous women reported the lowest level of psychological adjustment and the undifferentiated women the highest level of psychological adjustment. Finally, the result indicated that for both men and men, marital conflict were positively correlated with mid-crisis and depression, and negatively related with happiness.

• Child Health Nursing Research
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• v.11 no.1
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• pp.83-89
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• 2005

Purpose: The purpose of this study was to investigate the stress level, coping behaviors and health problems of elementary school children and to compare the level of these three variables according to size of city of residence and to identify the relationship among the three variables. Method: Data were collected by questionnaire from 465 5th and 6th grade elementary school children living in Daegu and North Kyungsang Province. Data were collected between December 1 and 20, 2003 and analyzed using the SPSS program with means, standard deviation, t-test, and Pearson's correlation coefficients. Results: The stress level was significantly higher in children who lived in the big city. The coping behavior score was not significantly different according to size of city, nor was there a difference in the health problems according to size of city. There was a positive correlation among stress level, coping behaviors and health problems. Conclusion: In general, the stress level was significantly different but coping behavior scores and health problem scores were not significantly different according to size of city. Also the elementary school children used more passive coping behavior than active coping behavior. Therefore, strategies to develop active coping behaviors for these children are needed.

• Structural Engineering and Mechanics
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• v.64 no.3
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• pp.301-310
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• 2017

For further development of passive control systems to dissipate larger seismic energy and prevent the structures from earthquake losses, this paper proposes an innovative two-level control system to improve behavior of chevron braced steel frames. Combining two Knee Braces, KB, and a Vertical Link Beam, VLB, in a chevron braced frame, this system can reliably sustain main shock and aftershocks in steel structures. The performance of this two-level system is examined through a finite element analysis and quasi-static cyclic loading test. The cyclic performances of VLB and KBs alone in chevron braced frames are compared with that of the presented two-level control system. The results show appropriate performance of the proposed system in terms of ductility and energy dissipation in two different excitation levels. The maximum load capacity of the presented system is about 30% and 17% higher than those of the chevron braced frames with KB and VLB alone, respectively. In addition, the maximum energy dissipation of the proposed system is about 78% and 150% higher than those of chevron braced frames with VLB and KB respectively under two separate levels of lateral forces caused by different probable seismic excitations. Finally, high performance under different earthquake levels with competitive cost and quick installation work for the control system can be found as main advantages of the presented system.

• Journal of Korean Academy of Nursing
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• v.30 no.2
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• pp.402-412
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• 2000

The purpose of this study is to identify health promotion behavior, self-efficacy and role stress of family caregivers who care for hospitalized cancer patient, The results would be used to provide the necessary basic data for promoting healthy behavior of the family caregivers to the cancer patient. The results were as follow : 1) The level of health promotion behavior was significantly different depending on the existence of care givers religion and type of help from family members. There was a positive relationship between the performance level of health promotion behavior and perceived health status or age. There was a negative correlation between the performance level of health promotion behavior and time cared for. 2) The level of self-efficacy was significantly different depending on gender and if the subject was employed. There was a positive relationship between perceived health status and intimacy with patient. 3) The level of role stress was significantly different in genders and relationships with patients. 4) There was a positive relationship between health promotion behavior and self-efficacy.

• The Journal of Korean Academic Society of Nursing Education
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• v.12 no.2
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• pp.205-213
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• 2006

Purpose: This study was to identify the relationship between clinical stress, self-efficacy, and self-esteem of nursing college students. Method: The data were collected from 172 nursing students in J city. Result: The average scores were; clinical stress 3.56/5, self-efficacy 3.52/5, and self-esteem 3.10/4. Clinical stress level was significantly different according to the general characteristics of clinical tutors(t=2.04, p=.043) and degree of clinical satisfaction(F=6.44, p=.002). Self-efficacy level was significantly different according to the general characteristics of school grade(t=2.29, p=.023) and degree of nursing major satisfaction(F=5.00, p=.008). Self-esteem level was significantly different according to the general characteristics of degree of clinical satisfaction(F=6.56, p=.002) and degree of nursing major satisfaction(F=14.22, p=.000). Self-efficacy level and self-esteem level showed a statistically significant but low positive correlation(r=.171, p=.05). Conclusion: A strategy for development of clinical stress management program is needed for nursing students.

• Development and Reproduction
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• v.24 no.3
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• pp.167-176
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• 2020

The fat pad defined as the epididymal fat is located at the head part of the epididymis. However, another fat mass is present near the caudal epididymis, named tail epididymal fat. The present research was focused to determine the expression of adipocyte-associated molecules in the mouse tail epididymal fat at different postnatal ages, including 2, 5, 8, and 12 months of age. The quantitative real-time PCR analysis showed continuous increases of expression levels of delta like non-canonical Notch ligand 1, leptin, and resistin as postnatally aged. The transcript level of peroxisome proliferator-activated receptor gamma was the highest at 5 months of age, remaining at a steady level until 12 months of age. Expression levels of fatty acid binding protein 4, leptin, and adiponectin were significantly increased until 8 months of age, persisting the level at 12 months of age. The transcript level of fatty acid synthase was significantly increased at 8 months of age, without a further change of the level at 12 months of age. These findings exhibited the expression of adipocyte-associated genes which were also detected at the ordinary epididymal fat pad. However, expression patterns of these genes in the tail epididymal fat are different with those in the distal and proximal epididymal fat, suggesting distinct characteristics and/or functions of the tail epididymal fat.

• Journal of Nutrition and Health
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• v.22 no.3
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• pp.185-193
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• 1989

This study was performed to investigate lead(Pb) detoxification with different dietary protein levels and detoxifying periods in Pb poisoned rats. Forty nine male rats of Sprague-Dawley strain weighing 114$\pm$4g were used and they were fed 1% Pb-15% casein diet ad libitum for 2 weeks. After sacrifying 7 animals as control group, remaining forty two rats were blocked into 6 groups according to body weight. Three groups were fed each detoxifying diet(5%, 15% or 40% casein diet without Pb) for 1 week and the other 3 groups were fed same diets for 3 weeks. The results obtained were summerized as follows ; 1) Liver and kidney weight, bone weight, and bone length were increased with increasing dietary protein level and detoxifying period. 2) Hematocrit values were recovered to normal level during detoxifiying periods but hemoglobin contents in detoxifying diet groups showed no significant difference from those in control group. 3)Pb contents in blood were decreased with increasing dietary protein level, and Pb contents in liver were significantly decreased in high protein diet groups. Pb contents in kidney were significantly decreased during detoxifying period compared to control group, but no significant difference was shown within the detoxifying diet groups. Pb contents in femur were significantly decreased after 3 weeks of detoxifying period but no difference was shown with different dietary protein level. 4) Urinary Pb excretions were significantly increased with increasing dietary protein level. Fecal Pb excretions were remarkably decreased after 3 weeks of detoxifying period, but no difference was showen in fecal Pb excretions with different dietary protein level. Above results suggest that high protein diet improves Pb detoxification by increasing urinary Pb excretion.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.17 no.5 s.122
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• pp.437-447
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• 2007

A series of research to seek for the relationship between subjective responses and noise level for transportation noise have been proceeded, and their results showed similar for some cases and different for some other cases as well, which is considered due to the various conditions such as the way of survey, different scale applied, and country etc. This study aimed to analyze the relationship between sound level and subjective response for the different kinds of transportation noise. The noises recorded in real situation were played to thirty subjects with fourty nine adjectives. The percentage of people annoyed(% PA) and the percentage of people highly annoyed(% HA) were calculated from the subjective results and compared how many percent of people are annoyed and highly annoyed for the same sound level. As a result of calculating the average, the aircraft noise was highest and the white noise lowest. The relationship between window TL and average point was well correlated except the aircraft noise which was scattered because of high sound level at specific frequency and low TL at corresponding frequency. This means that appropriate rating method for airborne sound transmission should be sought for to evaluate outdoor noise which has different frequency characteristics. The Boltzmann equation for % PA and % HA was applied to predict the sound level corresponding to the percentage. It is concluded that the aircraft noise and road traffic noise have almost same response and the railway noise was same with white noise, used for the reference noise, annoyed lower than other noises about by 3 dB.

• Korean Journal of Veterinary Research
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• v.15 no.2
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• pp.153-159
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• 1975

In order to investigate the effect of cobalt-60 gamma irradiation on the blood picture, the mice were subjected to single whole-body gamma irradiation externally. In this experiment 42 of 12 weeks old white mice were used and animals were allotted to group of three. On of chose groups served as control and the others as test groups that were exposed to single dose of 370 Rads (group I) and 500 Rads (group II). The exposure dose rate were averaged 33 Rads per Minute. The results obtained in this experiment were as follows: 1. Erythrocyte counts in both test groups dropped to the lowest level at 4 weeks postirradiation, returning towards the control level, but in recovery, group I showed rather prumpt compared with group II. Erythrocyte count in group II was significantly lower than that of group I. 2. Total leukocyte counts dropped to the lowest loved at 2 weeks postirradiation and group I recovered to normal level at 4 weeks postirradiation. Recovery group II was very slow and it reached to the control level on 12 weeks postirradiation. Leukocyte count was significantly different between group I and II. 3. Neutrophil count was increased to the highest level at 2 weeks postirradiation, with recovery to normal value after 8 weeks in group I and 12 weeks in group II, respectively. Neutrophil count was significantly different between group I and II. 4. Lymphocyte count dropped to the lowest level at 2 weeks postirradiation, with recovery to normal average after 8 weeks in group I and 12 weeks in group II, respectively. Lymphocyte count was significantly different between group I and II. 5. The other leukocyte count was increased after the irradiation and recovered at 12 weeks postirradiation in both test groups. The other leukocyte count was significantly different between group I and II.