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  1. Article: Constrained efficiency in a human capital model

    Park, Yena

    American economic journal / Macroeconomics Vol. 10, No. 3 , p. 179-214

    2018  Volume 10, Issue 3, Page(s) 179–214

    Author's details by Yena Park
    Keywords Humankapital ; Unvollkommener Markt ; Externer Effekt ; Investition ; Vermögensverteilung ; Arbeitsangebot ; Theorie
    Language English
    Publisher American Economic Association
    Publishing place Nashville, Tenn
    Document type Article
    ZDB-ID 2442376-2 ; 2452641-1
    ISSN 1945-7715 ; 1945-7707
    ISSN (online) 1945-7715
    ISSN 1945-7707
    Database ECONomics Information System

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  2. Article ; Online: The Role of Sargahydroquinoic Acid and Sargachromenol in the Anti-Inflammatory Effect of

    Park, Yena / Cao, Lei / Baek, Suhyeon / Jeong, Seungjin / Yun, Hyun Jung / Kim, Mi-Bo / Lee, Sang Gil

    Marine drugs

    2024  Volume 22, Issue 3

    Abstract: The anti-inflammatory effect of the ethanol extract ... ...

    Abstract The anti-inflammatory effect of the ethanol extract of
    MeSH term(s) Animals ; Mice ; Sargassum ; Chloroform ; Ethanol ; Lipopolysaccharides ; Alkenes ; Benzopyrans ; Benzoquinones
    Chemical Substances sargachromenol ; sargahydroquinoic acid ; Chloroform (7V31YC746X) ; Ethanol (3K9958V90M) ; Lipopolysaccharides ; Alkenes ; Benzopyrans ; Benzoquinones
    Language English
    Publishing date 2024-02-26
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2175190-0
    ISSN 1660-3397 ; 1660-3397
    ISSN (online) 1660-3397
    ISSN 1660-3397
    DOI 10.3390/md22030107
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Book ; Online: Constrained efficiency in a risky human capital model

    Park, Yena

    (Working paper / Rochester Center for Economic Research ; 585)

    2014  

    Author's details Yena Park
    Series title Working paper / Rochester Center for Economic Research ; 585
    Keywords Humankapital ; Unvollkommener Markt ; Externer Effekt ; Investition ; Vermögensverteilung ; Arbeitsangebot ; Theorie
    Language English
    Size Online-Ressource (45 S.), graph. Darst.
    Document type Book ; Online
    Database ECONomics Information System

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  4. Article: Optimal taxation in a limited commitment economy

    Park, Yena

    The review of economic studies Bd. 81.2014, 2 (Apr.)=Nr. 287, S. 884-918

    2014  

    Author's details Yena Park
    Keywords Ramsey Taxation ; Limited Enforcement
    Language English
    Size graph. Darst.
    Publisher Oxford Univ. Press
    Publishing place Oxford
    Document type Article
    ZDB-ID 209928-7 ; 2009656-2
    ISSN 1467-937X ; 0034-6527
    ISSN (online) 1467-937X
    ISSN 0034-6527
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  5. Book ; Online: Optimal taxation with private insurance

    Chang, Yongsung / Park, Yena

    (Working paper / Rochester Center for Economic Research ; no. 599 (March 2017))

    2017  

    Author's details Yongsung Chang and Yena Park
    Series title Working paper / Rochester Center for Economic Research ; no. 599 (March 2017)
    Language English
    Size 1 Online-Ressource (circa 39 Seiten), Illustrationen
    Publisher University of Rochester
    Publishing place Rochester, NY
    Document type Book ; Online
    Database ECONomics Information System

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  6. Book ; Online: Optimal taxation in a limited commitment economy

    Park, Yena

    (Working papers / Penn Institute for Economic Research ; 12,033)

    2012  

    Author's details by Yena Park
    Series title Working papers / Penn Institute for Economic Research ; 12,033
    Language English
    Size Online-Ressource (50 S.)
    Publisher Penn Inst. for Economic Research
    Publishing place Philadelphia, Pa
    Document type Book ; Online
    Note IMD-Felder maschinell generiert
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  7. Article ; Online: The interactive reading task: Transformer-based automatic item generation.

    Attali, Yigal / Runge, Andrew / LaFlair, Geoffrey T / Yancey, Kevin / Goodwin, Sarah / Park, Yena / von Davier, Alina A

    Frontiers in artificial intelligence

    2022  Volume 5, Page(s) 903077

    Abstract: Automatic item generation (AIG) has the potential to greatly expand the number of items for educational assessments, while simultaneously allowing for a more construct-driven approach to item development. However, the traditional item modeling approach ... ...

    Abstract Automatic item generation (AIG) has the potential to greatly expand the number of items for educational assessments, while simultaneously allowing for a more construct-driven approach to item development. However, the traditional item modeling approach in AIG is limited in scope to content areas that are relatively easy to model (such as math problems), and depends on highly skilled content experts to create each model. In this paper we describe the interactive reading task, a transformer-based deep language modeling approach for creating reading comprehension assessments. This approach allows a fully automated process for the creation of source passages together with a wide range of comprehension questions about the passages. The format of the questions allows automatic scoring of responses with high fidelity (e.g., selected response questions). We present the results of a large-scale pilot of the interactive reading task, with hundreds of passages and thousands of questions. These passages were administered as part of the practice test of the Duolingo English Test. Human review of the materials and psychometric analyses of test taker results demonstrate the feasibility of this approach for automatic creation of complex educational assessments.
    Language English
    Publishing date 2022-07-22
    Publishing country Switzerland
    Document type Journal Article
    ISSN 2624-8212
    ISSN (online) 2624-8212
    DOI 10.3389/frai.2022.903077
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Analysis of Total Antioxidant Capacities of Various Seaweeds Grown off the Korean Coast (P06-110-19)

    Lee, Chai-Hyeon / Kim, Bohkyung / Kim, Hyeung-Rak / Lee, Sang Gil / Park, Ye-Na

    Current developments in nutrition. 2019 June 13, v. 3, no. Supplement_1

    2019  

    Abstract: It has been a long time since seaweeds have been used for food ingredients in Asian countries. Recently, a body of research has revealed the health benefits of bioactive compounds in seaweeds, especially their antioxidant capacities. Although numerous ... ...

    Abstract It has been a long time since seaweeds have been used for food ingredients in Asian countries. Recently, a body of research has revealed the health benefits of bioactive compounds in seaweeds, especially their antioxidant capacities. Although numerous seaweeds inhabit in the ocean, only a small percentage has been explored for functional food. Therefore, the purpose of this study was to analyze the antioxidant capacities of various seaweeds grown off the Korean coast to screen for the potential functional food sources. Ten ethanol extracts of Korean seaweeds were provided by the National Marine Biodiversity Institute of Korea, which included Scytosiphon gracilis, Scytosiphon lomentaria, Sargassum muticum, Sargassum confusum, Petrospongium rugosum, Sargassum fusiforme, Petalonia fascia, Sargassum nigrifolium, Ishige foliacea, and Myelophycus simplex. Hundred mg/L of samples in 80% methanol was used to measure their ABTS, DPPH, and superoxide radical scavenging activities. Mg vitamin C equivalent antioxidant capacity (VCEAC)/100 mg was used to express the ABTS and DPPH radical scavenging capacities. For the superoxide radical scavenging capacity, inhibition rate of superoxide radical generation (%) was calculated. Among the ten seaweeds, S. nigrifolium and I. foliacea exhibited the most significant radical scavenging capacities. DPPH radical scavenging capacities of I. foliacea and S. nigrifolium were 122.4 mg VCEAC/100 mg and 95.8 mg VCEAC/100 mg, respectively. For ABTS radical scavenging capacity, I. foliacea exhibited 178.5 mg VCEAC/100 mg, followed by S. nigrifolium as 80.9 mg VCEAC/100 mg. I. foliacea inhibited about 68% of superoxide radical generation followed by S. nigrifolium (40.6%) while vitamin C as positive control inhibited about 28.9% of superoxide radical generation. The antioxidant capacities measured by the three assays were positively correlated with each other. The current study explored total antioxidant capacities of various Korean seaweeds and found I. foliacea and S. nigrifolium as the most potential antioxidant-rich food resources. Further research would be warranted to investigate bioactive compounds from S. nigrifolium and I. foliacea. This work was supported by the Pukyong National University Research Fund in 2018.
    Keywords 2,2-diphenyl-1-picrylhydrazyl ; antioxidant activity ; ascorbic acid ; bioactive compounds ; biodiversity ; coasts ; ethanol ; fascia ; functional foods ; ingredients ; Ishige ; macroalgae ; magnesium ; methanol ; Petalonia ; Petrospongium ; Sargassum fusiforme ; Sargassum muticum ; Scytosiphon ; superoxide anion ; Korean Peninsula
    Language English
    Dates of publication 2019-0613
    Publishing place Oxford University Press
    Document type Article
    ISSN 2475-2991
    DOI 10.1093/cdn/nzz031.P06-110-19
    Database NAL-Catalogue (AGRICOLA)

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  9. Article: White Adipocyte Browning Effects of Sargaquinoic Acid in 3T3-L1 Preadipocytes (P06-109-19)

    Lee, Sang Gil / Kim, Hyeung-Rak / Kwon, Misung / Lee, Bonggi / Lim, Su-Jin / Park, Ye-Na

    Current developments in nutrition. 2019 June 13, v. 3, no. Supplement_1

    2019  

    Abstract: Brown and beige adipocytes are known to combat obesity and hyperlipidemia by increasing energy expenditure through non-shivering thermogenesis. Since sargassum serratifolium, a marine brown alga, exhibited anti-obesity effect through white adipose tissue ...

    Abstract Brown and beige adipocytes are known to combat obesity and hyperlipidemia by increasing energy expenditure through non-shivering thermogenesis. Since sargassum serratifolium, a marine brown alga, exhibited anti-obesity effect through white adipose tissue browning in diet induced obese mice, the purpose of this study was to investigate the effects of sargaquinoic acid (SQA), a major component of S. serratifolium, on the induction of preadipocytes to beige adipocyte phenotype. 3T3-L1 preadipocytes were treated with SQA which was isolated from S. serratifolium. Triglyceride (TG) accumulation in 3T3-L1 cells was determined by lipid staining (Oil Red O) and colorimetric TG quantification assay. Change of free glycerol level in cell culture medium and gene expression related to fatty acid oxidation by SQA treatment in the 3T3-L1 cells were also measured. In addition, the expression of mitochondrial DNA was examined using real-time PCR to determine the mitochondrial biogenesis during adipocyte browning. Brown adipocyte related gene expressions were analyzed using real-time PCR. Western blot assay was utilized to examine the AMP-activated protein kinase (AMPK) activity during white adipocyte browning. SQA induced the differentiation of white adipocytes to beige adipocytes suggested by an increase in multilocular lipid droplets, mitochondrial density, and the brown adipocyte-specific gene expressions including uncoupling protein 1 and PR domain containing 16. Also, SQA increased the lipolysis and fatty oxidation related gene expressions. SQA increased AMPK activity to induce the expression of brown adipocyte-specific genes, since AMPK inhibitor (dorsomorphin) decreased the brown adipocyte-specific gene expressions. These findings indicate that SQA induces white adipocyte browning by activating AMPK pathway, suggesting SQA has the potential to be used as a dietary supplement to treat obesity and related metabolic diseases. This study was a part of the projects, “Development of functional food products with natural materials derived from marine resources” funded by the Ministry of Oceans and Fisheries, Republic of Korea.
    Keywords AMP-activated protein kinase ; animal disease models ; beta oxidation ; biogenesis ; brown adipocytes ; cell culture ; colorimetry ; culture media ; dietary supplements ; droplets ; energy expenditure ; fisheries ; functional foods ; gene expression ; genes ; glycerol ; heat production ; hyperlipidemia ; lipolysis ; marine resources ; mice ; mitochondria ; mitochondrial DNA ; obesity ; oceans ; oxidation ; phenotype ; quantitative polymerase chain reaction ; Sargassum serratifolium ; staining ; triacylglycerols ; Western blotting ; white adipocytes ; white adipose tissue ; South Korea
    Language English
    Dates of publication 2019-0613
    Publishing place Oxford University Press
    Document type Article
    ISSN 2475-2991
    DOI 10.1093/cdn/nzz031.P06-109-19
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  10. Article ; Online: Phototoxicity and oxidative stress responses in Daphnia magna under exposure to sulfathiazole and environmental level ultraviolet B irradiation.

    Kim, Jungkon / Park, Yena / Choi, Kyungho

    Aquatic toxicology (Amsterdam, Netherlands)

    2009  Volume 91, Issue 1, Page(s) 87–94

    Abstract: Sulfonamide antibiotics frequently occur in aquatic environments. In this study, phototoxicity of sulfathiazole (STZ) and its mechanism of action were investigated using Daphnia magna. We evaluated the changes of molecular level stress responses by ... ...

    Abstract Sulfonamide antibiotics frequently occur in aquatic environments. In this study, phototoxicity of sulfathiazole (STZ) and its mechanism of action were investigated using Daphnia magna. We evaluated the changes of molecular level stress responses by assessing gene expression, enzyme induction and lipid peroxidation, and the related organism-level effects in D. magna. In the presence of ultraviolet B (UV-B) light (continuous irradiation with 13.8+/-1.0microWcm(-2)d(-1)), STZ (at the nominal concentration of 94.9mg/L) caused a significant increase in reactive oxygen species (ROS) generation and lipid peroxidation. Catalase (CAT) and glutathione S-transferase (GST) showed concentration-dependent increases caused by the exposure. Exposure to STZ and UV-B light caused apparent up-regulation of alpha-esterase, hemoglobin, and vitellogenin mRNA. The survival of daphnids was significantly affected by the co-exposure to STZ and UV-B. The biochemical and molecular level observations in combination with organism-level effects suggest that the phototoxicity of STZ was mediated in part by ROS generated by oxidative stress in D. magna.
    MeSH term(s) Animals ; Catalase/metabolism ; Daphnia/drug effects ; Daphnia/radiation effects ; Dermatitis, Phototoxic ; Environment ; Gene Expression Regulation/drug effects ; Gene Expression Regulation/radiation effects ; Glutathione Transferase/metabolism ; Lipid Peroxidation/drug effects ; Lipid Peroxidation/radiation effects ; Oxidative Stress/drug effects ; Reactive Oxygen Species/analysis ; Sulfathiazoles/toxicity ; Ultraviolet Rays ; Water Pollutants, Chemical/toxicity
    Chemical Substances Reactive Oxygen Species ; Sulfathiazoles ; Water Pollutants, Chemical ; Catalase (EC 1.11.1.6) ; Glutathione Transferase (EC 2.5.1.18) ; sulfathiazole (Y7FKS2XWQH)
    Language English
    Publishing date 2009-01-18
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 782699-0
    ISSN 1879-1514 ; 0166-445X
    ISSN (online) 1879-1514
    ISSN 0166-445X
    DOI 10.1016/j.aquatox.2008.10.006
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