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  1. AU="Choi, Chi Young"
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  1. Article ; Online: Accurate measurements of particle emissions from a three-dimensional printer using a chamber test with a mixer-installed sampling system.

    Lee, Handol / Kwak, Dong-Bin / Choi, Chi Young / Ahn, Kang-Ho

    Scientific reports

    2023  Volume 13, Issue 1, Page(s) 6495

    Abstract: Recently, three-dimensional (3D) printing has attracted attention as a new manufacturing technology. However, there is lack of data and regulations regarding the emissions of ultrafine particles from 3D printers. Therefore, we investigated particle ... ...

    Abstract Recently, three-dimensional (3D) printing has attracted attention as a new manufacturing technology. However, there is lack of data and regulations regarding the emissions of ultrafine particles from 3D printers. Therefore, we investigated particle emissions from a 3D printer using a chamber system. The test system was improved by installing a developed mixer for accurate measurement. Without a mixer, the particle concentration was unstable depending on the sampling point; however, reliable data with good uniformity were obtained by installing a mixer. Using the test system with a mixer, we investigated particle emissions from a 3D printer during operation. Filaments made each of acrylonitrile butadiene styrene (ABS) and polylactic acid (PLA) were used as the printing material. The effects of nozzle temperature and printing time were investigated. Compared to the effect of the printing time, the nozzle temperature had greater impact on the particle emissions. The dominant particle size for the emissions from a 3D printer is less than 10 nm, and the particle concentration decreased with increasing particle size.
    Language English
    Publishing date 2023-04-20
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-023-33538-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Estimating impulse response functions when the shock series is observed

    Choi, Chi-Young / Chudik, Alexander

    Economics letters. 2019 July, v. 180

    2019  

    Abstract: We compare the finite sample performance of a variety of consistent approaches to estimating impulse response functions (IRFs) in a linear setup when the shock of interest is observed. Although there is no uniformly superior approach, iterated approaches ...

    Abstract We compare the finite sample performance of a variety of consistent approaches to estimating impulse response functions (IRFs) in a linear setup when the shock of interest is observed. Although there is no uniformly superior approach, iterated approaches turn out to perform well in terms of root mean-squared error (RMSE) in diverse environments and sample sizes. For smaller sample sizes, the inclusion of all ‘relevant’ variables is not always desirable.
    Keywords economics
    Language English
    Dates of publication 2019-07
    Size p. 71-75.
    Publishing place Elsevier B.V.
    Document type Article
    ISSN 0165-1765
    DOI 10.1016/j.econlet.2019.04.017
    Database NAL-Catalogue (AGRICOLA)

    Full text online

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  3. Article: The role of two frictions in geographic price dispersion

    Choi, Chi-Young / Choi, Horag

    Journal of international money and finance Vol. 63 , p. 1-27

    when market friction meets nominal rigidity

    2016  Volume 63, Page(s) 1–27

    Author's details Chi-Young Choi, Horag Choi
    Keywords Intercity price differences ; Distance ; Price stickiness ; Persistence ; Volatility ; State-dependent pricing
    Language English
    Publisher Elsevier
    Publishing place Amsterdam [u.a.]
    Document type Article
    ZDB-ID 872014-9
    ISSN 0261-5606
    Database ECONomics Information System

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  4. Article: Discontinuity of output convergence within the United States

    Choi, Chi-Young / Wang, Xiaojun

    Economic inquiry : journal of the Western Economic Association International Vol. 53, No. 1 , p. 49-71

    why has the course changed?

    2015  Volume 53, Issue 1, Page(s) 49–71

    Author's details Chi-Young Choi and Xiaojun Wang
    Keywords Regionale Konjunktur ; Wirtschaftliche Konvergenz ; Schätzung ; Preisindex ; Arbeitsproduktivität ; USA
    Language English
    Size graph. Darst., Kt.
    Publisher Wiley-Blackwell
    Publishing place Hoboken, NJ
    Document type Article
    ZDB-ID 191139-9 ; 2016121-9
    ISSN 1465-7295 ; 0095-2583
    ISSN (online) 1465-7295
    ISSN 0095-2583
    Database ECONomics Information System

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  5. Article: Does distance reflect more than transport costs?

    Choi, Chi-Young / Choi, Horag

    Economics letters. 2014 Oct., v. 125, no. 1

    2014  

    Abstract: We decompose the effect of distance on intercity retail price dispersion in US into transport and non-transport cost components. We find that distance contains more information than transport costs. Care should be taken in interpreting distance effect as ...

    Abstract We decompose the effect of distance on intercity retail price dispersion in US into transport and non-transport cost components. We find that distance contains more information than transport costs. Care should be taken in interpreting distance effect as transport costs only.
    Keywords prices ; United States
    Language English
    Dates of publication 2014-10
    Size p. 82-86.
    Publishing place Elsevier B.V.
    Document type Article
    ISSN 0165-1765
    DOI 10.1016/j.econlet.2014.08.016
    Database NAL-Catalogue (AGRICOLA)

    Full text online

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    Inter-library loan at ZB MED

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  6. Article: Reconsidering the relationship between inflation and relative price variability

    Choi, Chi-young

    Journal of money, credit and banking : JMCB Vol. 42, No. 5 , p. 769-798

    2010  Volume 42, Issue 5, Page(s) 769–798

    Author's details Chi-Young Choi
    Keywords Inflation ; Relativer Preis ; Volatilität ; Preisrigidität ; USA ; Japan
    Language English
    Size graph. Darst.
    Publisher Wiley-Blackwell
    Publishing place Malden, Mass. [u.a.]
    Document type Article
    ZDB-ID 218362-6 ; 2279967-9
    ISSN 1538-4616 ; 0022-2879
    ISSN (online) 1538-4616
    ISSN 0022-2879
    Database ECONomics Information System

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  7. Article ; Online: Predicting intradialytic hypotension using heart rate variability.

    Park, Samel / Kim, Wook-Joon / Cho, Nam-Jun / Choi, Chi-Young / Heo, Nam Hun / Gil, Hyo-Wook / Lee, Eun Young

    Scientific reports

    2019  Volume 9, Issue 1, Page(s) 2574

    Abstract: This study aimed to identify whether a new method using heart rate variability (HRV) could predict intradialytic hypotension (IDH) for one month in advance for patients undergoing prevalent hemodialysis. A total 71 patients were enrolled, and baseline ... ...

    Abstract This study aimed to identify whether a new method using heart rate variability (HRV) could predict intradialytic hypotension (IDH) for one month in advance for patients undergoing prevalent hemodialysis. A total 71 patients were enrolled, and baseline clinical characteristics and laboratory results were collected when HRV was measured, then, the frequency of IDH was collected during the observation period. HRV parameters included heart rate, R-R interval, the standard deviation of N-N interval, the square root of the mean squared differences of successive NN intervals, very low frequency, low frequency, high frequency, total power, and low frequency/high frequency ratio. During the one-month observation period, 28 patients experienced 85 cases of IDH (10.0% of a total 852 dialysis sessions). Among the clinical and laboratory parameters, ultrafiltration rate, prior history of diabetes, coronary artery disease, or congestive heart failure, age, intact parathyroid hormone level, and history of antihypertensive drug use were integrated into the multivariate model, referred to as a basic model, which showed significant ability to predict IDH (the area-under-curve [AUC], 0.726; p = 0.002). In HRV parameters, changes between the early and middle phases of hemodialysis (referred to Δ) were identified as significant independent variables. New models were built from the combination of Δ values with the basic model. Among them, a model with the highest AUC value (AUC, 804; p < 0.001) was compared to the basic model and demonstrated improved performance when HRV parameters were used (p = 0.049). Based on our results, it is possible that future IDH might be predicted more accurately using HRV.
    MeSH term(s) Adult ; Aged ; Female ; Heart Rate ; Humans ; Hypotension/diagnosis ; Hypotension/physiopathology ; Male ; Middle Aged
    Language English
    Publishing date 2019-02-22
    Publishing country England
    Document type Clinical Trial ; Journal Article ; Observational Study ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-019-39295-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: A reexamination of output convergence in the U.S. States

    Choi, Chi-young

    Journal of regional science Vol. 44, No. 4 , p. 713-741

    toward which level(s) are they converging?

    2004  Volume 44, Issue 4, Page(s) 713–741

    Author's details Chi-young Choi
    Keywords Entwicklungskonvergenz ; Regionale Einkommensverteilung ; Bruttoinlandsprodukt ; Teilstaat ; USA
    Language English
    Publisher Blackwell
    Publishing place Malden, Mass. [u.a.]
    Document type Article
    ZDB-ID 219215-9
    Database ECONomics Information System

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  9. Article: Searching for evidence of long-run PPP from a post-Bretton Woods panel

    Choi, Chi-young

    Journal of international money and finance Vol. 23, No. 7/8 , p. 1159-1186

    separating the wheat from the chaff

    2004  Volume 23, Issue 7, Page(s) 1159–1186

    Author's details Chi-young Choi
    Keywords 49
    Language English
    Publisher Elsevier
    Publishing place Amsterdam [u.a.]
    Document type Article
    ZDB-ID 872014-9
    Database ECONomics Information System

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  10. Article ; Online: A case report of successful pregnancy and delivery after peritoneal dialysis in a patient misdiagnosed with primary infertility.

    Choi, Chi-Young / Cho, Nam-Jun / Park, Samel / Gil, Hyo Wook / Kim, Yun-Sook / Lee, Eun Young

    Medicine

    2018  Volume 97, Issue 26, Page(s) e11148

    Abstract: Rationale: Currently, 15% of women in fertility age are infertile and the frequency is increasing. Among the various causes of infertility, end-stage renal disease (ESRD) has been shown to decrease the frequency of pregnancies compared with normal ... ...

    Abstract Rationale: Currently, 15% of women in fertility age are infertile and the frequency is increasing. Among the various causes of infertility, end-stage renal disease (ESRD) has been shown to decrease the frequency of pregnancies compared with normal females. However, dialysis of patients with ESRD increases the likelihood of pregnancy.Herein, we report successful pregnancy and delivery after peritoneal dialysis in a patient who was misdiagnosed as primary infertility.
    Patient concerns: A 37-year-old female who was unaware of her ESRD was misdiagnosed with primary infertility. After undergoing artificial insemination, she was referred to department of internal medicine because of generalized edema, dyspnea, nausea, vomiting, and poor oral intake. After evaluation, she was diagnosed with ESRD and initiated peritoneal dialysis.
    Diagnoses: The patients was on peritoneal dialysis for a year and discovered that she was pregnant.
    Interventions: During pregnancy, the patient maintained a residual urine output, BUN levels below 50 mg/dL, controlled blood pressure and a targeted hemoglobin range. She obtained adequate calories and protein and was managed by a multidisciplinary team.
    Outcomes: The patient delivered a preterm male baby with no anomalies.
    Lessons: ESRD should also be considered among the several causes of infertility in fertile women. If ESRD is the cause of infertility, the frequency of pregnancy increases following dialysis. If pregnancy is diagnosed early, intensive renal replacement therapy, adequate nutritional intake and regular fetal monitoring during pregnancy increase the chances of successful delivery while maintaining PD.
    MeSH term(s) Adult ; Delivery, Obstetric ; Diagnostic Errors ; Female ; Fertility ; Humans ; Infant, Newborn ; Infertility/diagnosis ; Infertility/etiology ; Insemination, Artificial/methods ; Kidney Failure, Chronic/complications ; Kidney Failure, Chronic/diagnosis ; Kidney Failure, Chronic/therapy ; Male ; Peritoneal Dialysis/methods ; Pregnancy
    Language English
    Publishing date 2018-06-25
    Publishing country United States
    Document type Case Reports ; Journal Article
    ZDB-ID 80184-7
    ISSN 1536-5964 ; 0025-7974
    ISSN (online) 1536-5964
    ISSN 0025-7974
    DOI 10.1097/MD.0000000000011148
    Database MEDical Literature Analysis and Retrieval System OnLINE

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