http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
우울 수준에 따른 가상멀미 경험이 가상현실 기반 신경인지과제 수행에 미치는 영향 : 고령집단을 중심으로
김인하(Kim, Inha)박정훈(Park, Junghun),이서정(Lee, Seojung),민성(Min, Sung),전주영(Jeon, Juyoung),조건우(Cho, Geonwoo),박혜연(Park, Haeyean),박다솔(Park, Dasol)박수현(Park, Soohyun) 한국재활심리학회 2021 재활심리연구 Vol.28 No.1
본 연구는 고령 집단에서 가상현실기반 평가 및 치료를 활용하는데 있어, 주요 장애물이 될 수 있는 가상멀미의 영향을 탐색하기 위해 진행되었다. 이 가운데서도 신경인지과제 수행 시, 우울감의 수준에따라 가상멀미가 과제수행에 미치는 영향을 탐색하고자 하였으며, 이를 확인하기 위하여 만 50세 이상성인 73명이 (1) 가상현실 기반 신경인지과제, (2) 가상멀미 수준과 우울을 측정하는 자기보고식 설문을 완료하였다. 연구 결과, 우울감이 클수록 가상현실 프로그램 시행에 따른 가상멀미 변화량이 커지는 경향을 보이며, 준임상 수준 이상에 해당하는 고우울 집단에서는 가상멀미가 가상현실기반 신경인지과제 수행에 유의한 영향을 미치는 것으로 나타났다. 저우울 집단에서는 이러한 영향이 유의하지 않았다. 이를 통해 준임상수준 이상의 고우울 집단에서는 지각된 가상멀미 수준이 가상현실기반 신경인지과제 수행에 부정적 영향을 미칠 수 있음이 시사되었다. 이러한 결과는 향후 고령의 우울집단에서 가상현실 치료를 활성화하기 위해, 주요 부작용인 가상멀미의 영향을 확인했다는 점에서 의의가 있으며, 이를 비롯한 본 연구의 의의와 한계점 및 후속 연구에 대해 논의하였다. This study was conducted to explore the effects of simulator sickness, which can be a major obstacle in the use of virtual reality-based evaluation and treatment in the elderly group. Also, the effect of depression level on simulator sickness and a virtual reality (VR)-based neurocognitive task performance was investigated. Seventy-three participants over the age of 50 years completed the (1) VR-based neurocognitive task and (2) self-report questionnaires measuring simulator sickness, and depressive symptoms. The results indicated that depression predicts the severity of perceived simulator sickness, and simulator sickness had a significant effect on the performance of the virtual reality-based neurocognitive task in a group with sub-clinical or clinical levels of depression. Based on the results, the implications, limitations and suggestions for future studies were discussed.
Simple Pretreatment Method Development for Iron and Calcium Carbonate Samples
Park, Junghun,Hong, Wan,Woo, H J,Choi, Han Woo,Kim, Joonkon,Kim, Gi Dong Cambridge University Press 2010 RADIOCARBON Vol.52 No.3
<P>Since iron artifacts generally contain trace amounts of carbon, an iron sample needs to be relatively large, as compared to other materials, and a specially designed combustion system is required. An elemental analyzer (EA) was used for the combustion of iron without any special chemical treatment. CO2 gas with 1 mg of carbon was obtained from the combustion of an iron artifact by using an EA and reduced to graphite for accelerator mass spectrometry (AMS) measurement. In this work, AMS dating results done at the Korea Institute of Geoscience and Mineral Resources (KIGAM) for several ancient iron artifacts are presented and compared with independently estimated ages. This method was found to be useful for the pretreatment of iron artifacts that contained >0.1% carbon. A simple pretreatment method using an EA was also applied to calcium carbonate (CaCO3) samples. Samples were preheated overnight at 100-300 °C, without any special chemical treatment. This removed modern CO2 contamination and the background level decreased to a comparable value measured in samples treated with phosphoric acid under vacuum.</P>
Junghun PARK 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Food poisoning is caused by various causes. In most cases, food poisoning is caused by food contaminated with bacteria such as Salmonella or E. coli . To detect these bacteria, a culture method is mainly used, but the culture method has a disadvantage in that it takes a long time. Recently, molecular diagnostic technologies have been widely used to detect these bacteria. Herein, we developed a portable real-time fluorescence monitoring instrument that can apply various molecular diagnostic technologies to detect food poisoning bacteria. This instrument can measure multiple fluorescence signals simultaneously, and real-time analysis is possible. In this study, we successfully analyzed E.coli, coliform, and total bacteria from livestock processed products by using Cas12a-based isothermal fluorescence generation system with the developed instrument. Since this instrument is small and easy to use, we expect that food poisoning bacteria can be easily detected in the field by using the instrument.
Vibration Analysis of wind turbine gearbox with frequency response analysis
박현용(Park, Hyunyong),박정훈(Park, Junghun) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
The wind turbine gearbox is important rotating part to transmit torque from turbine blade to generator. Generally, gear shaft which rotates causes vibration by influence of stiffness and mass with gear shaft. Root cause of this vibration source is well known to gear transmission error that is decided from gear tooth property. Transmission error excites a gear, and makes excitation force that is vibrated shaft. This vibration of shaft is transmitted to gearbox housing through gearbox bearing. If the resonance about which the natural frequency of the gearbox accords with shaft exciting frequency occurs, a wind turbine can lead to failure. The gearbox for wind turbine should be considered influence of vibration as well as the fatigue life and its performance by such reason. The cause to vibration should be closely examined to reduce influence of such vibration. In this paper, the cause of the vibration which occurs by a gearbox is closely examined and the method which can reduce the vibration which occurred is shown. It is compared with vibration test outcome of a 3MW gearbox for verification of the method shown by this paper.