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Chi Eun Oh(Chi Eun Oh),Hyun Ju Lim(Hyun Ju Lim),Jeounghyun Park(Jeounghyun Park),Eunsoo Moon(Eunsoo Moon),Ji Kyoung Park(Ji Kyoung Park) 대한정신약물학회 2022 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.20 No.4
Objective: This study aimed to explore the relationship among several indices of circadian rhythms and lipid peroxidation of brain tissue in mice. Methods: After entrainment of 4-week-old mice, one group was disrupted their circadian rhythms for three days and the other group for seven days (n = 10, respectively). After a recovery period, the Y-maze test, the elevated plus maze test, the tail suspension test, and the forced swimming test were conducted. To assess lipid peroxidation in brain tissue, thiobarbituric acid reactive substances were measured in the cortex, hippocampus, and cerebellum. Results: When circadian rhythms were disrupted and adapted back to their original rhythm, the recovery time of the 7-day disruption group (median 3.35 days) was significiantly faster than one of the 3-day disruption group (median 4.87 days). In the group with a 7-day disruption, mice that had recovered their rhythms early had higher malondialdehyde levels in their hippocampus compared to those with delayed recovery. The entrainment of circadian rhythms was negatively correlated with the malondialdehyde level of brain tissue. The behavioral test results showed no differences depending on the disruption durations or recovery patterns of circadian rhythms. Conclusion: These results suggest that disruption types, recovery patterns, and the entrainment of circadian rhythms are likely to affect oxidative stress in adolescents or young adult mice. Future study is needed to confirm and specify these results on the effects of circadian rhythms on oxidative stress and age-dependent effects.
Park, Eunsoo,Kim, Haksoo Earthquake Engineering Society of Korea 2004 한국지진공학회논문집 Vol.8 No.1
본 논문은 강교좌장치를 가지고 있는 연속 강교량을 지진으로부터 보호하기 위해서 형상기억합금을 이용한 장치를 제안했다. 예로 사용하고 있는 연속 강교량은 고정단을 가진 교각에 지진하중이 집중하고 상당히 큰 상부구조의 중량으로 인하여 교각에 손상을 입기 쉽고 상판의 교대에 대한 충돌로 교대의 수동변위가 크게 나타날 수 있다. 본 연구에서는 두 가지 종류의 restrainer-damper가 제안되었으며 지진해석을 통해서 효과를 검증하였다. 또한 미주에서 일반적으로 사용되고 있는 강재 케이블의 restraoiner와 성능을 비교하였다. This paper introduces a shape memory alloy-restrainer-damper(SMA-RD) to protect multiple span continuous steel bridges from seismic loads. The type of bridges has only one fixed bearing condition on a pier and expansion bearings are located on the other piers and abutments. Due to this state and a big mass of the deck, these bridges are usually very vulnerable to column's damage on which fixed bearings are located and large deformation of abutments in passive action. Two types of SMA-RDs are developed, and their effect is inspected for protecting the bridges through seismic analyses. Conventional steel restrainer cables are also used to reduce the seismic vulnerability of the bridge and the results are compared to those of the SMA-RDs.
Offline Deduplication for Solid State Disk Using a Lightweight Hash Algorithm
Park, Eunsoo,Shin, Dongkun The Institute of Electronics and Information Engin 2015 Journal of semiconductor technology and science Vol.15 No.5
Deduplication technique can expand the lifespan and capacity of flash memory-based storage devices by eliminating duplicated write operations. The deduplication techniques can be classified into two approaches, i.e., online and offline approaches. We propose an offline deduplication technique that uses a lightweight hash algorithm, whereas the previous offline technique uses a high-cost hash algorithm. Therefore, the memory space for caching hash values can be reduced, and more pages can be examined for deduplication during short idle intervals. As a result, it can provide shorter write latencies compared to the online approach, and can show low garbage collection costs compared to the previous offline deduplication technique.
Phenotyping of Low-Temperature Stressed Pepper Seedlings Using Infrared Thermography
Park, Eunsoo,Hong, Suk-Ju,Lee, Ah-Yeong,Park, Jongmin,Cho, Byoung-Kwan,Kim, Ghiseok Korean Society for Agricultural Machinery 2017 바이오시스템공학 Vol.42 No.3
Purpose: This study was performed to evaluate the feasibility of using an infrared thermography technique for phenotype analysis of pepper seedlings exposed to a low-temperature environment. Methods: We employed an active thermography technique to evaluate the thermal response of pepper seedlings exposed to low-temperature stress. The temperatures of pepper leaves grown in low-temperature conditions ($5^{\circ}C$, relative humidity [RH] 50%) for four periods (6, 12, 24, and 48 h) were measured in the experimental setting ($23^{\circ}C$, RH 70%) as soon as pepper seedling samples were taken out from the low-temperature environment. We also assessed the visible images of pepper seedling samples that were exposed to low-temperature stress to estimate appearance changes. Results: The greatest appearance change was observed for the low-temperature stressed pepper seedlings that were exposed for 12 h, and the temperature from these pepper seedling leaves was the highest among all samples. In addition, the thermal image of low-temperature stressed pepper seedlings for 6 h exhibited the lowest temperature. Conclusions: We demonstrated that the leaf withering owing to the water deficiency that occurred under low-temperature conditions could induce an increase in temperature in plant leaves using the infrared thermography technique. These results suggested that the time-resolved and averaged thermal signals or temperatures of plants could be significantly associated with the physiological or biochemical characteristics of plants exposed to low-temperature stress.
Phenotyping of Low-Temperature Stressed Pepper Seedlings Using Infrared Thermography
( Eunsoo Park ),( Suk-ju Hong ),( Ah-yeong Lee ),( Jongmin Park ),( Byoung-kwan Cho ),( Ghiseok Kim ) 한국농업기계학회 2017 바이오시스템공학 Vol.42 No.3
Purpose: This study was performed to evaluate the feasibility of using an infrared thermography technique for phenotype analysis of pepper seedlings exposed to a low-temperature environment. Methods: We employed an active thermography technique to evaluate the thermal response of pepper seedlings exposed to low-temperature stress. The temperatures of pepper leaves grown in low-temperature conditions (5°C, relative humidity [RH] 50%) for four periods (6, 12, 24, and 48 h) were measured in the experimental setting (23°C, RH 70%) as soon as pepper seedling samples were taken out from the low-temperature environment. We also assessed the visible images of pepper seedling samples that were exposed to low-temperature stress to estimate appearance changes. Results: The greatest appearance change was observed for the low-temperature stressed pepper seedlings that were exposed for 12 h, and the temperature from these pepper seedling leaves was the highest among all samples. In addition, the thermal image of low-temperature stressed pepper seedlings for 6 h exhibited the lowest temperature. Conclusions: We demonstrated that the leaf withering owing to the water deficiency that occurred under low-temperature conditions could induce an increase in temperature in plant leaves using the infrared thermography technique. These results suggested that the time-resolved and averaged thermal signals or temperatures of plants could be significantly associated with the physiological or biochemical characteristics of plants exposed to low-temperature stress.
Hyperspectral Visible/NIR Imaging Technique for Detection of Pathogenic Infections in Apple Fruits
( Eunsoo Park ),( Dhinesh Kumar Rajendran ),( Yong Hoon Lee ),( Kyung-hwan Kim ),( Byoung-kwan Cho ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
In order to improve the fruit productivity, it is essential to control infectious diseases of fruit. However, initial symptoms of most fruit infections are difficult to be identified with human inspection. The conventional disease measurements are very tedious and time-consuming, which takes at least a week. If the disease diagnosis is inaccurate and not performed on-time, it will not be able to cope with the infection. Thus, early detection of disease infection is crucial. In this study, we tried to develop nondestructive measurement technique for detecting early symptom of apple diseases. Hyperspectral Vis/NIR images were acquired for apples infected with white rot (Botryosphaeria dothidea) and bitter rot (Glomerella cingulata) from early infection to chronic stages. The best waveband ratio pair was investigated with analysis of variance (ANOVA) model. It was indicated that the waveband ratio of 908 nm / 946 nm could be used for identification of disease symptoms on apple. The waveband might be related to the moisture content which affects the hardness of apple fresh. The pattern of white rot and bitter rot disease could be distinguished using the waveband ratio of the spectral images. The results demonstrated that the simple spectral imaging technique might be able to be used as a portable and real-time inspection tool for apple disease in orchard.
Offline Deduplication for Solid State Disk Using a Lightweight Hash Algorithm
Eunsoo Park,Dongkun Shin 대한전자공학회 2015 Journal of semiconductor technology and science Vol.15 No.5
Deduplication technique can expand the lifespan and capacity of flash memory-based storage devices by eliminating duplicated write operations. The deduplication techniques can be classified into two approaches, i.e., online and offline approaches. We propose an offline deduplication technique that uses a lightweight hash algorithm, whereas the previous offline technique uses a high-cost hash algorithm. Therefore, the memory space for caching hash values can be reduced, and more pages can be examined for deduplication during short idle intervals. As a result, it can provide shorter write latencies compared to the online approach, and can show low garbage collection costs compared to the previous offline deduplication technique.