• Proceedings of the KSME Conference
• /
• 2005.11a
• /
• pp.85.2-85.2
• /
• 2005

• Journal of the Korean Institute of Telematics and Electronics
• /
• v.21 no.4
• /
• pp.78-83
• /
• 1984

A method is proposed for the adaptive control of linear time varying discrete systems. The stability problem of the model reference adaptive control systems is considered by means of the properties of hypergtability, The hyperstability approach also allows for solutions to the adaptation mechanism. Employing the principles of the continuous time case with output feedback renders it to the discrete case which simplified the system design. The system response is obtained by applying the ramp and step input as a reference signal to the system respectively. With checking the adaptation time for ramp and step input the validity of proposed algorithm was confirmed by the computer simulation.

• Molecules and Cells
• /
• v.46 no.3
• /
• pp.142-152
• /
• 2023

Nuclear factor erythroid 2-related factor 2 (Nrf2) mediates the cellular antioxidant response, allowing adaptation and survival under conditions of oxidative, electrophilic and inflammatory stress, and has a role in metabolism, inflammation and immunity. Activation of Nrf2 provides broad and long-lasting cytoprotection, and is often hijacked by cancer cells, allowing their survival under unfavorable conditions. Moreover, Nrf2 activation in established human tumors is associated with resistance to chemo-, radio-, and immunotherapies. In addition to cancer cells, Nrf2 activation can also occur in tumor-associated macrophages (TAMs) and facilitate an anti-inflammatory, immunosuppressive tumor immune microenvironment (TIME). Several cancer cell-derived metabolites, such as itaconate, L-kynurenine, lactic acid and hyaluronic acid, play an important role in modulating the TIME and tumor-TAMs crosstalk, and have been shown to activate Nrf2. The effects of Nrf2 in TIME are context-depended, and involve multiple mechanisms, including suppression of proinflammatory cytokines, increased expression of programmed cell death ligand 1 (PD-L1), macrophage colony-stimulating factor (M-CSF) and kynureninase, accelerated catabolism of cytotoxic labile heme, and facilitating the metabolic adaptation of TAMs. This understanding presents both challenges and opportunities for strategic targeting of Nrf2 in cancer.

• Journal of Korean Academy of Nursing
• /
• v.29 no.2
• /
• pp.238-247
• /
• 1999

The purpose of this study was to describe the relationship between family stress and adaptation in families with a disabled child through literature review using McCubbin's Double ABCX family crisis framework. The literature review focused on (1) family stress and factors affecting family stress, (2) the critical individual, familial and social resources which families acquire and employ over time in managing crisis situation. (3) the changes in definition and meaning families develop in an effort to make sense out of their predicament. (4) the coping strategies families employ. and (5) the range of outcomes of these family efforts The results showed that families reported financial difficulties and the burden of care-giving demands as major family stressors. Siblings of disabled children manifested depressive symptoms and social isolation. but was not consistent study results. The parents' views of the cause of the disabling condition fundamentally affected their behavior toward their disabled child. Especially. the fathers' views of the child's characteristics made the greatest contribution to positive changes in the mothers' perceptions. The term perceived social support refers to the cognitive appraisal by individuals that they are cared for and valued, that significant others are available to them if needed, and that they are satisfied with their interpersonal relationships. The perceived social support was more protective than social support source. network size and network density. Parental adaptation was found to be related to the child's communication competence rather than family coping strategies proposed by Lazarus and Folkman. One study results showed that there was no difference in depressive symptoms and physical health between mothers with a disabled child and those without all though mothers with a disabled child had negative attitudes and perceived themselves as having significantly less social support and lower family functioning. But a longitudinal study revealed decreases in the negative impact of the child and increases in sibling and overall family adaptation.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.31 no.4
• /
• pp.379-384
• /
• 1995

The retinomotor responses of jack mackerel, Trachurus japonicus and carp, Cyprinus carpio were studied for the different strobe flash frequencies in respects of the application of the light stimulus to herding and barrier system. The strobe flash frequencies ranged at 1.7, 5, 10, 25, 430Hz in jack mackerel and 1.7, 5, 25Hz in carp. The retinal adaptation ratio was examined histologically according to the time elasped of 1, 5, 10, 30min after turning on the light in each experimental condition. Cone index were determined in order to express the retinal adaptation ratio. Jack mackerel showed an increase of the retinal adaptation ratio ranging from average 27% at the pre-stimulus light to 42.6%, 49.8%, 59.8% and 83.1% at the irradiation times of 1, 5, 10 and 30min., respectively. Carp showed an increase of the retinal adaptation ratio ranging from average 28.4% at the pre-stimulus light to 51%, 53.9% and 91.3% at the irradiation times of 1, 5 and 30min., respectively. The light adaptation process was observed to be fast approximately in order of 430Hz, 25Hz, 5Hz, 1.7Hz and 10Hz for jack mackerel, and 25Hz, 5Hz and 1.7Hz for carp, and to be light-adaptated in 30 minutes.

• Journal of Digital Convergence
• /
• v.16 no.4
• /
• pp.371-378
• /
• 2018

The purpose of this study is to investigate the effect of family relations on facility adaptation of the elderly. In January and February of 2018, a questionnaire survey was conducted on 5 ~ 6 elderly residents of each long-term care facility, and finally 353 data were used for analysis. The main results of the study were as follows: First, the adaptation level of the elderly was high. As for 'maladjustment of group behavior' and 'movement shock', the level of maladjustment is low as 2 points, and adaptation dimension such as 'accept of new residence' and 'making friend' is above the middle level. Second, the influence of family variables was more influential than the demographic characteristics of the elderly and the influence of the facility-related variables. Among them, the closeness with family is the most influential. Therefore, it is suggested that the elderly need active support and efforts to maintain the intimacy with the family from the entrance to the facility and the time after the entrance.

• Journal of Agricultural Extension & Community Development
• /
• v.6 no.2
• /
• pp.119-139
• /
• 1999

While many factors could be mentioned to the rapid development of Israel for the last 50 years, it could not be overemphasized the critical role of large scale influx of Jewish immigrants not only in the process of achieving national independence but to the development of modernization. It is well known that mass influx of people in a relatively short period of time may cause serious social problems in various areas such as housing shortage, increasing crime rate, etc. Nontheless, Israel is avidly recognized as a country that successfully overcome such problems by means of creating systematic social integration systems and practicing various adaptation assistance programs for new immigrants. This study was concerned with such a successful social adaptation-assistance programs of Israel for large scale immigrants those who came from all over the world with different socio-economic background. In order to answer the research questions, following two areas of topics were researcher`s main concern. First, organizational structure and functions of the Ministry of Immigrant Absorption of Israel and Jewish Agency that are primarily responsible for the economic, occupational, social, and cultural integration of immigrants during their first three years (five years for housing-aid) in Israel. Second practical adaptation assistance programs such as direct absorption basket, Ulpan, Aliyah 2000, special projects of Keren Hayesod and two of Aliyah Absorption Centers are examined. And lastly some of implications and suggestions are provided in the conclusion section in relation with social adaptation-assistance and integration of reunified Korea, especially from the point of North Koreans.

• Korean Parent-Child Health Journal
• /
• v.20 no.1
• /
• pp.18-27
• /
• 2017

Purpose: This study aimed to verify the effects of prenatal breast self-massage education on first-time mothers' breastfeeding self-efficacy, breastfeeding adaptation, and breastfeeding practice. Method: The experimental group (n=26) received prenatal breast self-massage education focused on self mamma care (SMC) at 34-36 weeks gestation and 2 weeks later face-to-face. The control group (n=25) was recruited immediately following birth and received usual care. Breastfeeding self-efficacy was measured 4 hours after childbirth and 3 days later, and breastfeeding practice, breastfeeding adaptation, and breastfeeding-related characteristics were measured 2 weeks and 4 weeks after childbirth through online survey. The data were analyzed by $x^2$ test and t-test using SPSS/WIN 24.0. Results: There was no significant difference in breastfeeding self-efficacy of the experimental group at 4 hours after childbirth (t=0.83, p=.410) whereas it was statistically significantly higher at 3 days postpartum (t=2.86, p=.006). There were no significant differences in breastfeeding adaptation between the two groups at both 2 weeks (t=1.76, p=.084) and 4 weeks postpartum (t=0.87, p=.388). For breastfeeding practice a statistically significant difference was found at 4 weeks for the experimental group ($x^2=4.77$, p=.036). Conclusion: This antenatal SMC intervention was found to be a feasible intervention for use in clinical practice.

• Journal of KIISE:Software and Applications
• /
• v.31 no.10
• /
• pp.1320-1331
• /
• 2004

A video adaptation system translates the source video stream into appropriate video stream while satisfying the network and client constraints and maximizing the video quality as much as possible. This paper proposes a semi-dynamic video adaptation scheme, in which several intermediate video streams and the information for the measuring of video quality are generated statically. The intermediate video streams are generated by reducing the resolution of the video stream by a power of two several times, and they are stored as the intermediate video streams on the video server. The statically generated information for the input video stream consists of the degrees of smoothness for each frame rate and the degree of frame definition for each pixel bit rate. It helps to dynamically generate the target video stream according to the client's QoS at run-time as quickly as possible. Experimental result shows that the proposed adaptation scheme can generate the target video stream about thirty times faster while keeping the quality degradation as less than 2% comparing to the target video stream that is totally dynamically generated, although the extra storages for the intermediate video streams are required.

• Journal of the Korean Society of Food Culture
• /
• v.36 no.4
• /
• pp.349-361
• /
• 2021

This study was conducted to investigate the dietary adaptation and use of the university foodservice (UF) in Korea according to the residence period of foreign students. The average length of residence in Korea of t he subjects was 8.2 months. The period of residence was divided into quartiles: 1-4 months in the first quartile (average 2.2 months), 5-7 months in the second quartile (average 6.3 months), 8 months in the third quartile, and 9-66 months in the fourth quartile (average 18.3 months). The regularity of meals tended to be the highest in the 1st quartile and lowest in the 2nd quartile and then increased in the 3rd and 4th quartiles. The frequency of consumption of delivery food and convenience store food was lowest in the first quartile and highest in the second quartile and then decreased with the period of residence. The frequency of night eating increased according to the period of residence after the second quartile. The degree of adaptation to Korean foods was highest in the first quartile. The use of the university cafeteria was significantly higher in the 1st and 4th quartiles than in the 2nd and 3rd quartiles (p<0.05, p<0.01, respectively). The satisfaction with the UF decreased as the residence period increased. Based on these results, since international students are very positive and try to adapt to the dietary life in Korea in their early years of studying in Korea, it would be desirable to intensively support them to adjust to their dietary life at this time. In addition, since it takes about 18 months or more to assimilate the Korean food culture and show positive changes, it is necessary to continuously operate the Korean food culture adaptation program for international students over this period.