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- 저자 : Junha Park (검색결과 59 건)
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Asymmetric nozzle structure for particles converging into a highly confined region
Park, Junha,Chung, Seok,Yun, Hoyoung,Cho, Keunchang,Chung, Chanil,Han, Dong-Chul,Chang, Jun Keun Elsevier 2006 CURRENT APPLIED PHYSICS Vol.6 No.6
<P><B>Abstract</B></P><P>Asymmetric nozzle inlet was suggested for particles to converge into a highly confined region. The physical properties from the nano-scaled volumetric difference at nozzle inlet were investigated using computational fluid dynamics and particle motion measurement with fluorescence beads and erythrocytes. The asymmetric nozzle structure made particles converge efficiently without clogging at nozzle inlet. It could be used as a micro/nanofluidic unit for cell based assay in a microchip such as chip-based flow cytometer.</P>
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Junha Park,Taekwan Kim,김민아,이태영,Jun Soo Kwon 대한신경정신의학회 2020 PSYCHIATRY INVESTIGATION Vol.17 No.2
Objective It is well established that the cortico-striato-thalamo-cortical (CSTC) circuit is implicated in the pathophysiology of obsessive- compulsive disorder (OCD). However, reports on corticostriatal functional connectivity (FC) in OCD have been inconsistent due to the structural and functional heterogeneity of the striatum. Therefore, in the present study, we investigated corticostriatal FC using a fine 12-seed striatal parcellation to overcome this heterogeneity and discover the neural correlates of symptoms in OCD patients. Methods We recruited 23 OCD patients and 23 healthy controls (HCs). Whole-brain FC based on striatal seeds was examined using resting-state functional magnetic resonance imaging data and compared across OCD patients and HCs. We conducted correlation analysis between FCs of striatal subregions with significant group differences and symptom severity scores on the Yale-Brown Obsessive Compulsive Scale (Y-BOCS), Hamilton Rating Scale for Depression, and Hamilton Rating Scale for Anxiety (HAM-A). Results Compared to HCs, patients demonstrated increased FC of the dorsal caudal putamen and ventral rostral putamen (VRP) with several cortical regions, such as the intracalcarine cortex, inferior frontal gyrus, supramarginal/angular gyrus (SMG/AG), and postcentral gyrus (PCG). Furthermore, FC between the VRP and SMG/AG and between the VRP and PCG was negatively correlated with scores on the Y-BOCS compulsive subscale and the HAM-A, respectively. Conclusion These findings suggest that striatal subregions have strengthened FC with extensive cortical regions, which may reflect neural correlates of compulsive and anxious symptoms in OCD patients. These results contribute to an improved understanding of OCD pathophysiology by complementing the current evidence regarding striatal FC.
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Designing new honey bee hive with multiple sensory system for urban beekeeping
Junha Park,Eujin Kim,Jinho Seo,Sewook Lee,Sungwon Shin,Aiden Choi,Susie Cho 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.10
꿀벌에 대한 중요성이 인식되고 도시양봉의 수요가 증가하는 가운데 도시양봉에 최적화된 벌통을 제작하였 다. 꿀벌과 도시양봉에 대한 설문를 진행한 결과, 분봉으로 인한 민원이 도시양봉을 하는 데 가장 큰 저해요소로 꼽혔다. 이에 분봉을 방지하여 시민과 어우러질 수 있으며 친환경적인 벌통을 제작하는 데 초점을 맞췄다. 분봉을 방지하기 위해서는 여왕벌의 이탈을 감지하는 자성 센서와 벌들이 분봉을 하고자 하는 욕구인 분봉열을 감지하 는 온도 센서를 설치하여 효율을 파악하였다. 더불어 최근 이상기후로 인한 잦은 폭우와 고열을 견디기 위하여 밀랍을 이용한 벌통 코팅을 진행하였다. 벌통의 바닥에는 트레이를 서랍처럼 분리 설치할 수 있도록 함으로써 무더운 기온에서는 손쉽게 트레이를 빼서 환기에 중점을 두고, 그 외의 조건에서는 트레이를 끼워둠으로써 바닥 에 떨어진 꿀벌의 사체를 주기적으로 수거하여 유전자 분석을 함으로써 꿀벌의 건강 상태를 점검할 수 있도록 하였다. 꿀벌이 해당 벌통으로 인하여 스트레스를 받는지 꿀벌의 주요 스트레스 마커 유전자의 상대적 발현량을 조사한 결과, 일반적인 벌통에서의 발현량 수준과 큰 차이가 없는 것을 확인할 수 있었다. 이처럼 새로이 디자인된 벌통을 이용한다면 이상기후에서도 도시양봉을 하는 데 기여할 수 있을 것으로 기대된다.
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박준하 ( Junha Park ) 한국금융연구원 2021 금융연구 Vol.35 No.4
본고에서는 중앙은행이 주택가격 상승에 대응하여 통화정책을 사용해야 하는지(lean against the wind)를 판단하기 위한 주요한 전제조건으로서 주택가격 거품의 존재 여부, 통화정책이 주택가격 거품에 미치는 영향 두 가지를 분석하였다. 분석 결과, 수도권 지역(서울, 인천, 경기)에서 2006~2007년 주택가격 상승이 예상 주택가격상승률을 상승시킴으로써 귀속 임대료를 비교적 크게 하락시켰던 것으로 추정되었는데 이는 당시 비합리적 거품이 존재하였음을 시사한다. 2018년 전국에서 유일하게 서울에서 이러한 거품이 발생한 것으로 분석되었으나 거품의 지속성 및 크기는 2006~2007년 보다는 약했던 것으로 나타났다. 통화정책 충격이 주택가격 거품에 미치는 효과의 경우, 금리 인상 직후 초기국면에는 거품이 감소하는지 확실하게 나타나지 않았으나 종국적으로는 거품을 감소시키는 것으로 추정되었다. 이러한 결과들은 주택시장에서의 비합리적 거품의 발생이 빈번한 현상은 아닐 수 있으며, 동시에 통화정책이 정책 초기 다소의 불확실성에도 불구하고 주택가격 거품에 대응하기 위한 적절한 수단이 될 수 있음을 보여준다. 즉, 주택시장에 거품이 존재하는지에 여부 대한 신중한 판단이 필요함을 전제로, 통화정책이 금융안정을 위해 사용될 수 있는 상황이 존재함을 시사한다. In this paper, how far there exist the bubbles frequently in the housing market and the effect of monetary policy on them are examined as the main prerequisites in evaluating whether the central bank should lean against the wind through monetary policy to achieve the financial stability goal. First, the no-arbitrage condition between the imputed rent and the market rent is established through the simple model, and empirical analysis is performed on when the condition is not satisfied in order to investigate how far bubbles occur frequently in the housing market. Next, assuming a risk-neutral investor with the rational expectations and an economy with rational bubbles, the effect of the monetary policy shock on the rational bubble included in the house price is estimated through the time-varying parameter VAR model with bayesian MCMC (markov chain monte carlo) algorithm to examine the impact of monetary policy shocks on housing bubbles. In the analysis on frequency of the housing bubbles, Estimated results implies that there was the irrational bubbles between 2006 and 2007 in the metropolitan area (Seoul, Incheon, Kyungki). It is estimated that the bubbles continued until the first half of 2008. The imputed rent to market rent ratio was significantly below the long-term average. Thus, it can be seen that during the period, consumers were still "undervalued" despite the rise in house prices, and the increase in house prices increased the expectation for future house prices growth rate, thereby reducing the imputed rents rather than increasing them. The situation in which the irrational bubble collapses after the global financial crisis shows the opposite situation. During 2009-2013, the imputed rent to market rent ratio continued to exceed the long-term average. It shows that consumers were "overvalued" despite the decrease in house prices because the expectation of a significant drop in house prices increased the imputed rents. The bubbles are analyzed to have started from the nationwide upward momentum in 2002. In the metropolitan area, the upward trend was developed into the bubble, whereas it was not developed into the bubble and prices were adjusted properly by market mechanism in other regions. Since 2014, after about six years of the bubbles extinguishing process, the imputed rents to market rents ratio was generally at the long-term average. In the case of Seoul, the imputed rents to market rents ratio was significantly below the long-term average, indicating that the irrational bubbles occurred in the Seoul area during that period. However, unlike the situation right before the financial crisis, housing bubbles did not occur in the metropolitan area other than Seoul, and the size of the bubbles is analyzed to be limited compared to the previous one. In 2019, the imputed rents to the market rent ratio again significantly exceeded the long-term average with the rising house prices. It implies that consumers overvalued house prices in 2019 and that house prices would enter a phase with downward pressure in 2020, although the big shocks related to COVID-19 in 2020 have changed all these predictions evaluated before 2020. In the analysis on the effect of monetary policy shocks on the housing bubbles, it is estimated that an interest rate hike would reduce the bubble. At the beginning of the interest rate rise, the response value of the bubbles to monetary policy shock is uncertain to evaluate the increase or decrease. But, the value gradually decreases and becomes a negative in the second half of the reaction, which implies that a tight monetary policy shock can reduce rational bubbles certainly at least after the 10th quarter from the shock. The results imply that there is evidence that monetary policy on reducing the rational bubbles can be effective after some period since the policy is implemented while there is uncertainty initially. Taken together, key takeaway from the paper are two things. First, the results that bubbles occurred in the metropolitan area in 2006-2007 and Seoul in 2018 for 20 years indirectly imply that the occurrence of the irrational bubbles in the housing market is not a frequent phenomenon. Thus, there might only be limited cases in which housing bubbles must be dealt with through monetary policy at least in Korea, given those estimation results and the theoretical possibility of continuous credit expansion derived from falling the real interest rate. Secondly, monetary policy is highly likely to reduce the housing bubble, although there are some uncertainty in the effect of the policy on bubbles in early phases. It implies that monetary policy can be used as appropriate instrument to target the financial stability in limited but necessary circumstances.
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