• Title/Summary/Keyword: Stress memory

Search Result 370, Processing Time 0.029 seconds

Finite Element Modeling for Static and Dynamic Analysis of Structures with Bolted Joints (볼트결합부를 포함한 구조물의 정적 및 동적 해석을 위한 유한요소 모델링)

  • Gwon, Yeong-Du;Gu, Nam-Seo;Kim, Seong-Yun;Jo, Min-Ho
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.26 no.4
    • /
    • pp.667-676
    • /
    • 2002
  • Many studies on the finite element modeling for bolted joints have proceeded, but the structures with bolted joints are complicated in shape and it is difficult to find out the characteristics according to joint condition. Usually, experimental methods have been used for bolted joint analysis. A reliable and practical finite element modeling technique for structure with bolted joints is very important for engineers in industry. In this study, three kinds of model are presented; a detailed model, a practical model and a simple model. The detailed model is modeled by using 3-D solid element and gap element, and the practical model is modeled by using shell element (a portion of bolt head) and beam element (a portion of bolt body), the simple model is modeled by simplifying practical model without using gap elements. Among these models, the simple model has the least degree of freedom and show the effect of memory reduction of 59%, when compared with the detailed model.

Deposition Pressure Dependent Electric Properties of (Hf,Zr)O2 Thin Films Made by RF Sputtering Deposition Method

  • Moon, S.E.;Kim, J.H.;Im, J.P.;Lee, J.;Im, S.Y.;Hong, S.H.;Kang, S.Y.;Yoon, S.M.
    • Journal of the Korean Physical Society
    • /
    • v.73 no.11
    • /
    • pp.1712-1715
    • /
    • 2018
  • To study the applications for ferroelectric non-volatile memory and ferroelectric memristor, etc., deposition pressure dependent electric the properties of $(Hf,\;Zr)O_2$ thin films by RF sputtering deposition method were investigated. The bottom electrode was TiN thin film to produce stress effect on the formation of orthorhombic phase and top electrode was Pt thin film by DC sputtering deposition. Deposition pressure was varied along with the same other deposition conditions, for example, sputtering power, target to substrate distance, post-annealing temperature, annealing gas, annealing time, etc. The structural and electric properties of the above thin films were investigated. As a result, it is confirmed that the electric properties of the $(Hf,\;Zr)O_2$ thin films depend on the deposition pressure which affects structural properties of the thin films, such as, structural phase, ratio of the constituents, etc.

Application of Deep Learning: A Review for Firefighting

  • Shaikh, Muhammad Khalid
    • International Journal of Computer Science & Network Security
    • /
    • v.22 no.5
    • /
    • pp.73-78
    • /
    • 2022
  • The aim of this paper is to investigate the prevalence of Deep Learning in the literature on Fire & Rescue Service. It is found that deep learning techniques are only beginning to benefit the firefighters. The popular areas where deep learning techniques are making an impact are situational awareness, decision making, mental stress, injuries, well-being of the firefighter such as his sudden fall, inability to move and breathlessness, path planning by the firefighters while getting to an fire scene, wayfinding, tracking firefighters, firefighter physical fitness, employment, prediction of firefighter intervention, firefighter operations such as object recognition in smoky areas, firefighter efficacy, smart firefighting using edge computing, firefighting in teams, and firefighter clothing and safety. The techniques that were found applied in firefighting were Deep learning, Traditional K-Means clustering with engineered time and frequency domain features, Convolutional autoencoders, Long Short-Term Memory (LSTM), Deep Neural Networks, Simulation, VR, ANN, Deep Q Learning, Deep learning based on conditional generative adversarial networks, Decision Trees, Kalman Filters, Computational models, Partial Least Squares, Logistic Regression, Random Forest, Edge computing, C5 Decision Tree, Restricted Boltzmann Machine, Reinforcement Learning, and Recurrent LSTM. The literature review is centered on Firefighters/firemen not involved in wildland fires. The focus was also not on the fire itself. It must also be noted that several deep learning techniques such as CNN were mostly used in fire behavior, fire imaging and identification as well. Those papers that deal with fire behavior were also not part of this literature review.

Analysis and Prediction of Behavioral Changes in Angelfish Pterophyllum scalare Under Stress Conditions (스트레스 조건에 노출된 Angelfish Pterophyllum scalare의 행동 변화 분석 및 예측)

  • Kim, Yoon-Jae;NO, Hea-Min;Kim, Do-Hyung
    • Korean Journal of Fisheries and Aquatic Sciences
    • /
    • v.54 no.6
    • /
    • pp.965-973
    • /
    • 2021
  • The behavior of angelfish Pterophyllum scalare exposed to low and high temperatures was monitored by video tracking, and information such as the initial speed, changes in speed, and locations of the fish in the tank were analyzed. The water temperature was raised from 26℃ to 36℃ or lowered from 26℃ to 16℃ for 4 h. The control group was maintained at 26℃ for 8 h. The experiment was repeated five times for each group. Machine learning analysis comprising a long short-term memory model was used to train and test the behavioral data (80 s) after pre-processing. Results showed that when the water temperature changed to 36℃ or 16℃, the average speed, changes in speed and fractal dimension value were significantly lower than those in the control group. Machine learning analysis revealed that the accuracy of 80-s video footage data was 87.4%. The machine learning used in this study could distinguish between the optimal temperature group and changing temperature groups with specificity and sensitivity percentages of 86.9% and 87.4%, respectively. Therefore, video tracking technology can be used to effectively analyze fish behavior. In addition, it can be used as an early warning system for fish health in aquariums and fish farms.

Novel Cultivation of six-year-old Korean Ginseng (Panax ginseng) in pot: From Non-Agrochemical Management to Increased Ginsenoside

  • Kyung Ho Hwang;Hyun Gi Kim;Kiyoung Jang;Yong Ju Kim
    • Journal of Ginseng Research
    • /
    • v.48 no.1
    • /
    • pp.98-102
    • /
    • 2024
  • Background: Ginseng (Panax ginseng Meyer) is a perennial plant belonging to the Araliaceae family that is known to have various beneficial effects including improving memory loss and spatial cognitive ability, and anti-cancer and anti-diabetes activity. Its functional benefits also include improving liver function, regulating blood pressure, stress, and providing antioxidant activity. Usually, various agrochemicals are used in cultivating ginseng preventing from many diseases. Methods: FCGP (field cultivated ginseng in pot) was implemented by imitating MCWG (mountain cultivated wild ginseng). Pesticide analysis of pot cultivation was carried out and the contents of bioactive components such as ginsenoside were also analyzed. Results: FCGP ginsenoside content was higher than that of FCG (field cultivated ginseng) and MCWG. FCGP has been shown to have a relatively high antioxidant effect compared with cultivated ginseng. Conclusion: It was confirmed that ginseng can be grown for 6 years without resorting to use of pesticides. In addition, it was confirmed that effective accumulation of physiologically active ingredients such as ginsenoside is possible. Our result represents FCGP is a novel method of pesticide-free ginseng cultivation

Forgetting Stories from the Islands, Jeju and Calauit

  • Raymon D. Ritumban
    • SUVANNABHUMI
    • /
    • v.16 no.1
    • /
    • pp.103-123
    • /
    • 2024
  • The traumatic experiences of people from peripheral islands are susceptible to mnemocide. Such erasure of memory is facilitated by "defensive and complicit forgetting," which, according to Aleida Assmann, leads to "protection of perpetrators." My paper reflects on the vulnerability of traumas from the islands to mnemocide by looking into [1] the massacre of communists and civilians on Jeju Island, South Korea in 1948 as described in Hyun-Kil Un's short story "Dead Silence" (2017; English trans.) and [2] the eviction of residents and indigenous people from Calauit Island, Philippines for the creation of a safari in 1976 as imagined in Annette A. Ferrer's "Pablo and the Zebra" (2017). In "Dead Silence," I direct the attention to how to the execution of the villagers-witnesses to the death of the communist guerillas-is a three-pronged violence: it is a transgression committed against the innocent civilians; an act of "erasing traces to cover up" the military crackdown on the island; and, by leaving the corpses out in the open, a display of impunity. In "Pablo and the Zebra," I second that both residents (i.e., humans and animals) experience post-traumatic stress because of their respective displacements; thus, the tension between them has got to stop. Curiously, while it concludes with a reconciliatory gesture between an elder and a zebra, no character demanded a reparation for their traumatic past per se. Could the latter be symptomatic of a silence that lets such violence "remain concealed for a long time"?

Dynamic Changes in the Bridging Collaterals of the Basal Ganglia Circuitry Control Stress-Related Behaviors in Mice

  • Lee, Young;Han, Na-Eun;Kim, Wonju;Kim, Jae Gon;Lee, In Bum;Choi, Su Jeong;Chun, Heejung;Seo, Misun;Lee, C. Justin;Koh, Hae-Young;Kim, Joung-Hun;Baik, Ja-Hyun;Bear, Mark F.;Choi, Se-Young;Yoon, Bong-June
    • Molecules and Cells
    • /
    • v.43 no.4
    • /
    • pp.360-372
    • /
    • 2020
  • The basal ganglia network has been implicated in the control of adaptive behavior, possibly by integrating motor learning and motivational processes. Both positive and negative reinforcement appear to shape our behavioral adaptation by modulating the function of the basal ganglia. Here, we examined a transgenic mouse line (G2CT) in which synaptic transmissions onto the medium spiny neurons (MSNs) of the basal ganglia are depressed. We found that the level of collaterals from direct pathway MSNs in the external segment of the globus pallidus (GPe) ('bridging collaterals') was decreased in these mice, and this was accompanied by behavioral inhibition under stress. Furthermore, additional manipulations that could further decrease or restore the level of the bridging collaterals resulted in an increase in behavioral inhibition or active behavior in the G2CT mice, respectively. Collectively, our data indicate that the striatum of the basal ganglia network integrates negative emotions and controls appropriate coping responses in which the bridging collateral connections in the GPe play a critical regulatory role.

EFFECT OF RED GINSENG ON MICE EXPOSED TO VARIOUS STRESSES (홍삼이 스트레스에 노출된 생쥐의 행동에 미치는 영향)

  • Saito Hiroshi;Bao Tiantong
    • Proceedings of the Ginseng society Conference
    • /
    • 1984.09a
    • /
    • pp.97-105
    • /
    • 1984
  • Effect of water extract of red ginseng (Panax ginseng C.A. Meyer) from Nagano prefecture on (1) forced exercise in mice using rope climbing test, (2) extinction of memory in hanging stressed mice and rectal temperature during the exposure to hanging stress, (3) sex and learning behavior of chronic hanging stressed mice, (4) sex cycle in the adult female mice using chronic hanging stress, and (5) motor coordination and one trial passive avoidance response in $40\%$ alcohol administered mice using rotar-rod and step-through tests, were studied. Drugs tested were given orally. (1) When it was given before the forced exercise, it potentiated the performance of the forced exercise. When it was given just after the forced exercise once a day for 2 weeks, it protected the mice against the reduction of the performance on the forced exercise. (2) When it was given just after the stress once a day for 4 days, it delayed the extinction of passive avoidance response in both step through and stepdown tests, and protected the stressed mice against the decrease in rectal temperature slightly. (3) It protected the stressed mice against the decrease of sex behaviour and the increase in the failure of performance of passive avoidance response, and delayed the extinction of passive avoidanc

  • PDF

Cognitive improvement effects of Momordica charantia in amyloid beta-induced Alzheimer's disease mouse model (여주의 amyloid beta 유도 알츠하이머질환 동물 모델에서 인지능력 개선 효과)

  • Sin, Seung Mi;Kim, Ji Hyun;Cho, Eun Ju;Kim, Hyun Young
    • Journal of Applied Biological Chemistry
    • /
    • v.64 no.3
    • /
    • pp.299-307
    • /
    • 2021
  • Accumulation of amyloid beta (Aβ) and oxidative stress are the most common reason of Alzheimer's disease (AD). In the present study, we investigated the cognitive improvement effects of butanol (BuOH) fraction from Momordica charantia in Aβ25-35-induced AD mouse model. To develop an AD mouse model, mice were received injection of Aβ25-35, and then orally administered BuOH fraction from M. charantia at doses of 100 and 200 mg/kg/day during 14 days. In the T-maze and novel object recognition test, administration of BuOH fraction from M. charantia L. at doses of 100 and 200 mg/kg/day improved spatial ability and novel object recognition by increased explorations of novel route and new object. In addition, BuOH fraction of M. charantia-administered groups improved learning and memory abilities by decreased time to reach hidden platform in Morris water maze test. Oral administration of BuOH fraction from M. charantia significantly inhibited lipid peroxidation and nitric oxide levels in the brain, liver, and kidney compared with Aβ25-35-induced control group. These results indicated that BuOH fraction of M. charantia improved Aβ25-35-induced cognitive impairment by attenuating oxidative stress. Therefore, M. charantia could be useful for protection from Aβ25-35-induced cognitive impairment.

In-vitro Neuroprotective Effect of Aricumin(Turmeric extract) (아리큐민의 In-vitro 신경보호 효과)

  • Yoon, Nam kyu;Kim, Byung Kwon;Ryu, Hyeon yeol;Seo, Bo Seung;Shin, Chang Ho;Kim, Kwan Kyu;Lee, Han Joo
    • The Journal of the Convergence on Culture Technology
    • /
    • v.8 no.3
    • /
    • pp.291-296
    • /
    • 2022
  • This study was conducted on curcumin which had increased bioavailability as a potential AChE inhibitor for the treatment of neurodegenerative diseases. The purpose of this study is to confirm the in vitro neuroprotective effect on Aricumin (turmeric extract). To confirm the neuroprotective effect, AChE inhibition for Aricumin was evaluated, and cell viability was analyzed for HT-22cell, and oxidative stress (glutamate, H2O2)-induced HT-22 cytotoxicity was evaluated. As a result of the change in the AChE inhibition rate of Aricumin (Turmeric extract), it was confirmed that Aricumin at a concentration of 39.06㎍/ml or higher inhibited AChE activity by about 20% and more. And it was confirmed that the cytotoxicity of HT-22 cells induced by oxidative stress (Gluamate 5 mM and H2O2 500 µM) was significantly inhibited from 0.01 to 0.1 mg/ml concentration (p<005). These results suggest that Aricumin (turmeric extract) have potential neuroprotective effects.