The effects of teachers’ learning experiences on teaching: A case study of five elementary teachers of English

( Park¸ Eun Soo ) 현대영미어문학회 2008 현대영미어문학회 추계학술대회 발표논문집 Vol.2008 No.-

야간 도심환경에서 객체 검출을 위한 데이터 셋 검증에 관한 연구

김지원(Geewon Kim),신주석(Juseok Shin),강현우(Hyunwoo Kang) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6

Relationship of Circadian Rhythm in Behavioral Characteristics and Lipid Peroxidation of Brain Tissues in Mice

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.

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.

Biogas as a Potential Energy Source for South Korea

( Eunsoo Park ),( Woon-ju Ha ),( Taehwan Lee ),( Hong-lae Cho ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회 추계학술발표논문집 Vol.2019 No.-

South Korea continued to seek for the possible solutions to major environmental issues, for instance, climate change, air pollution from burning fossil fuels, and other problems arose from waste management. Compare to other renewable energies, biogas energy comprises more potential benefits not only for the society, but also for the economy. In consideration of the society experiencing negative impacts by these environmental problems, it is the government of South Korea’s responsibility to take an action to this. Among the possible solutions, biogas energy appears to be the most potentially beneficial to South Korea. In Europe, biogas energy is widely used for waste management, production of renewable energy and support agricultural activities. Specifically, Germany is the leading country for biogas production with around 7,800 agricultural biogas plants. On the other hand, South Korea only owns 11 agricultural biogas plants. Hence, waste management and renewable energy production are more efficiently operated in Germany compare to South Korea. Despite the high costs of implementing and managing biogas plants, European countries did not hesitate to invest in biogas energy because of the potential benefits were more valuable. The aim of this study is to suggest the possible policies that the government of South Korea can adapt from the systems for biogas production implemented in Europe. Furthermore, it is conspicuous that lack of number biogas plants and financial support from the government is repressing South Korea from improving biogas production. To enhance biogas plant production, South Korea should implement more biogas plants by modifying the Renewable Energy Certificate (REC) weighting system to attract more industries to both produce and use it as their main renewable energy source.

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.

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.

Protein Kinase C Activity and Delayed Recovery of Sleep-Wake Cycle in Mouse Model of Bipolar Disorder

Eunsoo Moon,Byeong-Moo Choe,Je-Min Park,Young In Chung,Byung Dae Lee,Jae-Hong Park,Young Min Lee,Hee Jeong Jeong,YongJun Cheon,Yoonmi Choi,Jeonghyun Park 대한신경정신의학회 2018 PSYCHIATRY INVESTIGATION Vol.15 No.9

Objective Previous studies reported the delayed recovery group after circadian rhythm disruption in mice showed higher quinpiroleinduced locomotor activity. This study aimed to compare not only Protein Kinase C (PKC) activities in frontal, striatal, hippocampus and cerebellum, but also relative PKC activity ratios among brain regions according to recovery of circadian rhythm. Methods The circadian rhythm disruption protocol was applied to eight-week-old twenty male Institute Cancer Research mice. The circadian rhythm recovery patterns were collected through motor activities measured by Mlog system. Depressive and manic proneness were examined by forced swim test and quinpirole-induced open field test respectively. Enzyme-linked immunosorbent assay was employed to measure PKC activities. Results The delayed recovery group presented greater locomotor activities than the early recovery group (p=0.033). The delayed recovery group had significantly lower frontal PKC activity than the other (p=0.041). The former showed lower frontal/cerebellar PKC activity ratio (p=0.047) but higher striatal/frontal (p=0.038) and hippocampal/frontal (p=0.007) PKC activities ratios than the latter. Conclusion These findings support potential mechanism of delayed recovery after circadian disruption in bipolar animal model could be an alteration of relative PKC activities among mood regulation related brain regions. It is required to investigate the PKC downstream signaling related to the delayed recovery pattern.

Antifungal Mechanism of Action of Lauryl Betaine Against Skin-Associated Fungus Malassezia restricta

( Eunsoo Do ),( Hyun Gee Lee ),( Minji Park ),( Yong-joon Cho ),( Dong Hyeun Kim ),( Se-ho Park ),( Daekyung Eun ),( Taehun Park ),( Susun An ),( Won Hee Jung ) 한국균학회 2019 Mycobiology Vol.47 No.2

Betaine derivatives are considered major ingredients of shampoos and are commonly used as antistatic and viscosity-increasing agents. Several studies have also suggested that betaine derivatives can be used as antimicrobial agents. However, the antifungal activity and mechanism of action of betaine derivatives have not yet been fully understood. In this study, we investigated the antifungal activity of six betaine derivatives against Malassezia restricta, which is the most frequently isolated fungus from the human skin and is implicated in the development of dandruff. We found that, among the six betaine derivatives, lauryl betaine showed the most potent antifungal activity. The mechanism of action of lauryl betaine was studied mainly using another phylogenetically close model fungal organism, Cryptococcus neoformans, because of a lack of available genetic manipulation and functional genomics tools for M. restricta. Our genome-wide reverse genetic screening method using the C. neoformans gene deletion mutant library showed that the mutants with mutations in genes for cell membrane synthesis and integrity, particularly ergosterol synthesis, are highly sensitive to lauryl betaine. Furthermore, transcriptome changes in both C. neoformans and M. restricta cells grown in the presence of lauryl betaine were analyzed and the results indicated that the compound mainly affected cell membrane synthesis, particularly ergosterol synthesis. Overall, our data demonstrated that lauryl betaine influences ergosterol synthesis in C. neoformans and that the compound exerts a similar mechanism of action on M. restricta.

Seismic Protection for Multiple Span Continuous Steel Bridges using Shape Memory Alloy-Restrainer-Dampers

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.