• Proceedings of the Korean Society of Fisheries Technology Conference
• /
• 2000.05a
• /
• pp.276-277
• /
• 2000

어류의 성숙 및 배란을 유도하기 위해 어류 및 개구리의 뇌하수체 추출물, 인간의 태반성생식소자극호르몬(HCG), 어류의 생식소자극호르몬(GTH), 포유류의 황체형성호르몬방출호르몬(LHRH) 그리고 이들의 유사체(analogue)들이 주로 이용되고 있다. 특히 시상하부의 신경분비 세포에서 분비되는 LHRH를 이용한 어류의 배란 및 산란에 대한 연구는 여러 어종에 대해서 시도되어 왔다. (중략)

• 한국정보교육학회:학술대회논문집
• /
• 2007.01a
• /
• pp.365-372
• /
• 2007

뇌파는 대뇌피질에 분포하는 신경세포의 활동을 객관적으로 명확하게 표현해주기 때문에 학습자의 두뇌기능을 과학적으로 평가해준다. 따라서 학습에 의한 직접적인 효과를 알아보기 위해서는 두뇌사고활동을 수행하는 과정에서 학습자의 두뇌기능 상태에 대한 객관적인 검증이 필요하다. 또한 학습자의 학습과정에서의 활성뇌파를 분석 해봄으로써 학습에 영향을 미치는 뇌파가 무엇인지를 파악할 수 있다. 본 연구는 학습 및 학습에 영향을 미치는 정서와 관련된 뇌파연구를 고찰함으로써 영재아의 학습효과를 높이기 위한 뇌파 분석 및 조절 프로그램을 개발하는데 시사점을 찾아보고자 한다.

• Journal of rehabilitation welfare engineering & assistive technology
• /
• v.9 no.4
• /
• pp.331-337
• /
• 2015

This research was to develop the cycling system of lower limbs for rehabilitation during cycle exercise in supine position. Also we analyzed the muscular activity of lower-limbs at various exercise conditions according to exercise mode, load, velocity. 42 healthy subjects(ages 20-60 years) were participated. We measured the muscular activities of right lower limb muscle in rectus femoris, biceps femoris, tibialis anterior, medial gastrocnemius, soleus. Results, medial gastrocnemius shows high value on load 10 stage than load 1 and 5 stage. And all muscular activity except medial gastrocnemius was decreased as increase of velocity. We have found that there is a difference of lower limbs activity depending on exercise mode and method. This study could be applied to reference data to develop cycle system of lower limbs for rehabilitation.

• Applied Chemistry for Engineering
• /
• v.32 no.2
• /
• pp.132-138
• /
• 2021

This review investigated the types of physiologically active substances isolated and extracted from Pinus densiflora and koraiensis native to Republic of Korea, and the current status of research on their effectiveness and industrial use. They contain various bioactive substances including essential oils, polyphenols, resins, and stilbene derivatives. In recent, physiological activities such as antioxidant, anti-inflammatory, antibacterial, cataract prevention, and neuroprotection from extracts of Pinus densiflora and koraiensis have been identified by domestic researchers. The extracts have been used in different industrial fields like food, health functional foods, cosmetics, and household goods, but the high proportion of them is industrially made from exotic species. Therefore, various studies on industrial applicability are needed due to the lack of cases in which the activity is applied to actual products, with respect to the effects that have been scientifically recognized.

• Journal of Science Education
• /
• v.46 no.1
• /
• pp.30-39
• /
• 2022

The purpose of this study is to compare and analyze secondary school student's brain activity on assimilation, conflict, and accommodation processes of self-regulation. The self-regulation task was presented a biological phylogenetic task, and the brain activity was measured and analyzed with fNIRS. As a result, a significant activation was found in the left DLPFC, OFC, and FP regions in the conflict process compared to the assimilation process, and a significant activation was found in DLPFC and VLPFC in the accommodation process. As the age increase, the DLPFC also increases in the conflict process and VLPFC increases in the assimilation process. In addition, comparing conflict and accommodation process, the 7th grade students show a significant brain activity in the right VLPFC, the 9th grade students show significant brain activity in the left FP and DLPFC areas in the accommodation process. However, the 11th grade students did not show any significant brain activity at this process. These results presumably show that the neurological research method could be applied to educational research in cognitive activity and classroom instructional situation.

• Food Science and Preservation
• /
• v.18 no.1
• /
• pp.124-129
• /
• 2011

PC12 neuronal cell-protective effects of hot water extracts of guava fruit and leaf were evaluated. Total phenolic levels in fruit and leaf were 11.75 and 293.25 mg/g, respectively. Gallic acid, the predominant phenoic, was detected in both extracts. Intracellular reactive oxygen species (ROS) accumulation after $H_2O_2$ treatment was significantly reduced when the hot water extract of guava leaf was added to cell medium, compared to PC12 cells treated with $H_2O_2$ only. In a cell viability assay using 3-(4,5-dimethyl-thiazol-2-yl)-2,5-diphenyl- tetrazoliumbromide (MTT), the hot water extracts of fruit and leaf protected against $H_2O_2$-induced neurotoxicity. The leaf extract was more effective in terms of inhibition of lactate dehydrogenase (LDH) release into medium, compared to the fruit extract. These in vitro data suggest that hot water extracts of guava fruit and leaf may be useful in treatment of neurodegenerative conditions such as Alzheimer's disease.

• Korean Journal of Food Science and Technology
• /
• v.47 no.3
• /
• pp.380-387
• /
• 2015

The anti-amnesic effect of Artemisia argyi H against trimethyltin (TMT)-induced learning and memory impairment and its neuroprotective effect against $H_2O_2$-inducedoxidative stress were investigated. Cognitive behavior was examined by Y-maze and passive avoidance test for 4 weeks, which showed improved cognitive functions in mice treated with the extract. In vitro neuroprotective effects against $H_2O_2$-induced oxidative stress were examined using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-tetrazolium-bromide and lactate dehydrogenase (LDH) assays. A. argyi H. extract showed protective effects against $H_2O_2$-induced neurotoxicity; moreover, LDH release into the medium was inhibited. Finally, high-performance liquid chromatography (HPLC) analysis showed that eupatilin and jaceosidin were the major phenolic compounds in A. argyi H. extract. These results suggest that A. argyi H. could be a good source of functional substances to prevent neurodegenerative diseases.

• Journal of the Korea Convergence Society
• /
• v.9 no.5
• /
• pp.33-41
• /
• 2018

The purpose of this study is to develop more accurate and robust emotion prediction neural network (EPNN) model by combining heart rate variability (HRV) and neural network. For the sake of improving the prediction performance more reliably, the proposed EPNN model is based on various types of activation functions like hyperbolic tangent, linear, and Gaussian functions, all of which are embedded in hidden nodes to improve its performance. In order to verify the validity of the proposed EPNN model, a number of HRV metrics were calculated from 20 valid and qualified participants whose emotions were induced by using money game. To add more rigor to the experiment, the participants' valence and arousal were checked and used as output node of the EPNN. The experiment results reveal that the F-Measure for Valence and Arousal is 80% and 95%, respectively, proving that the EPNN yields very robust and well-balanced performance. The EPNN performance was compared with competing models like neural network, logistic regression, support vector machine, and random forest. The EPNN was more accurate and reliable than those of the competing models. The results of this study can be effectively applied to many types of wearable computing devices when ubiquitous digital health environment becomes feasible and permeating into our everyday lives.

• Journal of the Institute of Electronics Engineers of Korea SC
• /
• v.48 no.2
• /
• pp.40-46
• /
• 2011

This paper proposes a real-time face detection and tracking system that uses neural oscillators which can be applied to access regulation system or control systems of user authentication as well as a new algorithm. We study a way to track faces using the neural oscillatory network which imitates the artificial neural net of information handing ability of human and animals, and biological movement characteristic of a singular neuron. The system that is suggested in this paper can broadly be broken into two stages of process. The first stage is the process of face extraction, which involves the acquisition of real-time RGB24bit color video delivering with the use of a cheap webcam. LEGION(Locally Excitatory Globally Inhibitory)algorithm is suggested as the face extraction method to be preceded for face tracking. The second stage is a method for face tracking by discovering the leader neuron that has the greatest connection strength amongst neighbor neuron of extracted face area. Along with the suggested method, the necessary element of face track such as stability as well as scale problem can be resolved.

• Korean Security Journal
• /
• no.31
• /
• pp.7-24
• /
• 2012

In this study a practical guarding work is carried out for 180 minutes as the same as the actual guarding work that is done by nine students of the department of security services in K University in order to investigate changes in circadian rhythms during long hour guarding in bodyguards at practical sites. In the results of the tests of the heart rate variation and autonomic nervous system with the interval of 30 minutes using HRV (Heart rate variability), there are no significant differences in HRV and SDNN and that leads to maintain it stably during the guarding work for 180 minutes. In the case of TP which reflects the overall activity level in the autonomic nervous system, it shows a high significant difference (p<.05) at 90 and 120 minutes compared to that of normal states. Also, it shows a significant decrease in the level after a lapse of 120 minutes and that shows a decrease in the activity of the autonomic nervous system for the guarding work more than 120 minutes. Although differences in VLF, LF, and HF are not significant levels, these are influenced on the change in TP. The LH/HF ratio that represents the balance between the sympathetic nerve and the parasympathetic nerve shows a significant high level (p<.05) after a lapse of 30 minutes. Thus, it is considered that the concentration of the guarding work after a lapse of 120 minutes is decreased and there are some tensions and excitations after a lapse of 30 minutes since the beginning of the guarding work.