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A Derivation of Potential Korean Exports to Africa
김흥종,Youngho Park 대외경제정책연구원 2002 East Asian Economic Review Vol.6 No.2
The aim of the paper is to derive potential Korean exports to major African countries. Park (2001) adopted conventional RCA and MCA techniques to evaluate the relative performance of Korean exports to draw up a list of recommendable exports to Africa. We improve Park's results in two ways; first, we develop a new indicator reflecting the characteristics of the African market, which was ignored in the former analysis, and second, we derive the RCA and MCA values of Chinese and Japanese exports to Africa and compare them with those of Korean products. The final list of Korea's potential exports to the African market is carefully derived and we find that competing with Japanese exports rather than Chinese ones is a more appropriate strategy for amending Korea's record of underperforming exports to Africa.
Kwon, Soon Jik,Kim, Tae Geun,Park, Youngjun,Kwon, Ohseok,Cho, Youngho The Ecological Society of Korea 2015 Journal of Ecology and Environment Vol.38 No.4
This study was performed to provide important basic data for the preservation and management of Scopura laminata, a species endemic to Korea, by elucidating the spatial characteristics of its present, potential, and future distribution areas. Currently, this species is found in the Odaesan National Park area of South Korea and has been known to be restricted in its habitat due to its poor mobility, as even fully grown insects do not have wings. Utilizing the MaxEnt model, 20 collection points around Odaesan National Park were assessed to analyze and predict spatial distribution characteristics. The precision of the MaxEnt model was excellent, with an AUC value of 0.833. Variables affecting the potential distribution area of S. laminata by more than 10% included the range of annual temperature, seasonality of precipitation, and precipitation of the driest quarter, in order of greatest to least impact. Compared to the current potential distribution area, no significant difference in the overall habitable area was predicted for the 2050s or 2070s. It was, however, demonstrated that the potential habitable area would be reduced in the 2050s by up to 270.3 km from the current area of 403.9 km; further, no potential habitable area was anticipated by the 2070s according to our predictive model. Taken together, it is anticipated that this endemic species could be significantly affected by climate changes, and hence effective countermeasures are strongly warranted for the preservation of habitats and species management.
Secure and Scalable Key Aggregation Scheme for Cloud Storage
Park, YoHan,Park, YoungHo Korea Society of Industrial Information Systems 2015 한국산업정보학회논문지 Vol.20 No.2
As the communication technology and mobile devices develop, the need for the efficient and secure remote storage is required. And recently, many companies support cloud storages to meet the requirements of the customers. Especially in the business field where various companies collaborate, data sharing is an essential functionality to enhance their work performance. However, existing researches have not fully satisfied the requirement either efficiency and security. This paper suggests efficient and secure data sharing scheme for cloud storage by using secret sharing scheme. Proposed scheme can be applied to business collaborations and team projects.
Park Byoung Hee,Kwon Oh Wook,Kim In Sung,Lee Hae Min,Roh Yeon Jin,Kim Minseo,Jo Youngho,Cho Hwayeon,Park Jung Kuk,Zhi Zheng,Lee Byung Cheon 한국응용생명화학회 2021 Applied Biological Chemistry (Appl Biol Chem) Vol.64 No.1
Microglia are the macrophages that reside in the brain. Activated microglia induces further activation of astrocytes and neuronal cells for mounting an immune response. However, activated microglia release neurotoxic mediators causing neuroinflammation, which is associated with chronic etiology of neurodegenerative diseases. We investigated the effect of ethanol extract of Physalis alkekengi L. var. francheti fruit (PAFE) on neuronal cell death mediated by activated microglia. PAFE decreased NO production and IL-6 secretion in LPS-stimulated BV-2 and primary microglial cells without reducing cell viability. Consistently, treatment with PAFE decreased iNOS and COX-2 expression and ERK phosphorylation in LPS-stimulated BV-2 cells. Finally, apoptosis of N2a cells grown in conditioned media prepared from LPS-stimulated BV-2 cells containing PAFE was inhibited via downregulation of the Bax/Bcl-2 ratio. Taken together, PAFE alleviates neuronal cell death by reducing neurotoxic mediators such as NO and IL-6 from activated microglia. Therefore, it could be a potential candidate to treat neurodegenerative diseases caused by chronic neuroinflammation.