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SANG-YONGJOO 대외경제정책연구원 2000 East Asian Economic Review Vol.4 No.1
The Korea experienced drastic increases in the statistical discrepancy in balance of payments since 1997. In general, the expansion and complexity of external transactions induced by contributing capital account liberalization has contributed to this fact. The abolition of the export/import approval system seems to have accelerated the mismeasurement and omissions in external transactions. Of course, the influence of currency crisis occurred cannot be ruled out. Among economic factors, Won/dollar exchange rate volatility is found to have significant explanatory power on the magnitude of statistical discrepancy, while exchange rate returns have not. WE interpret this as the demand for relatively safe currency rising in presence of the uncertainty in domestic currency values.
Market behavior and performance of different strategy evaluation schemes.
Baek, Yongjoo,Lee, Sang Hoon,Jeong, Hawoong Published by the American Physical Society through 2010 Physical review. E, Statistical, nonlinear, and so Vol.82 No.2
<P>Strategy evaluation schemes are a crucial factor in any agent-based market model, as they determine the agents' strategy preferences and consequently their behavioral pattern. This study investigates how the strategy evaluation schemes adopted by agents affect their performance in conjunction with the market circumstances. We observe the performance of three strategy evaluation schemes, the history-dependent wealth game, the trend-opposing minority game, and the trend-following majority game, in a stock market where the price is exogenously determined. The price is either directly adopted from the real stock market indices or generated with a Markov chain of order ?? . Each scheme's success is quantified by average wealth accumulated by the traders equipped with the scheme. The wealth game, as it learns from the history, shows relatively good performance unless the market is highly unpredictable. The majority game is successful in a trendy market dominated by long periods of sustained price increase or decrease. On the other hand, the minority game is suitable for a market with persistent zigzag price patterns. We also discuss the consequence of implementing finite memory in the scoring processes of strategies. Our findings suggest under which market circumstances each evaluation scheme is appropriate for modeling the behavior of real market traders.</P>
효율적인 BIoT 개발을 위한 블록체인 ETH 2.0 플랫폼 분석
이용주(YongJoo Lee),우성희(Sung-Hee Woo) 한국정보통신학회 2021 한국정보통신학회 종합학술대회 논문집 Vol.25 No.1
4차 산업에 대한 꾸준한 투자와 개발로 IoT 기술이 보다 발전하게 되었고, 이에 따라 필요한 보안 플랫폼을 제공할 수 있는 플랫폼 기반의 블록체인 기술이 필요하게 되었다. 블록체인 기반의 IoT 어플리케이션인 BIoT는 향후 보다 다양한 분야에 적용되기 위하여 보다 정교한 보안성과 확장성 및 효율성을 제공하는 플랫폼 기술이 요구된다. 본 논문에서는 최근 발표되어 이슈가 되고 있는 스마트 컨트랙트 ETH 2.0을 분석하여 기존의 BIoT 개발에 요구되는 사항들을 비교하고 향후 다가오는 BIoT의 미래를 전망하여 본다. The steady investment and development in the fourth industry led to the development of IoT technology, which led to the dissemination of platform-based blockchain technology that could provide the necessary security platform. BIoT, a blockchain-based IoT application, requires blockchain platform technology that provides more sophisticated security, scalability, and efficiency in order to be applied to more diverse fields in the future. In this paper, we analyze the recently announced smart contract ETH 2.0 to compare the requirements for existing BIoT development and to predict the future of BIoT in the future.
( Clara Yongjoo Park ),( Bora Lee ),( Sung Jae Lee ) 한국임상영양학회 2020 Clinical Nutrition Research Vol.9 No.2
Calcium intake is essential for bone health, but young Korean women have low calcium intakes. Seaweeds have high calcium content, which may affect calcium metabolism. Twenty nine females aged 18-39 years with low calcium intake (< 400 mg/day) participated in a 19-day open-label randomized controlled trial. During the first five days, participants adhered to a controlled-feeding protocol followed by a two-week supplementation period in free-living conditions. The treatment group (n = 14) received an additional 200 mg Ca/day through Undaria pinnatifida and Porphyra in meals during the controlled-feeding period, and as U. pinnatifida noodles during days 6-19. Mineral intake (Ca, P, Mg, Na, and K) was assessed from diet composites and three 24-hour recalls during the controlled-feeding and free-living periods, respectively. Fasting serum levels of calcium, 25-hydroxyvitamin D, 1,25-dihydroxyvitamin D (1,25[OH]D), phosphorus, parathyroid hormone (PTH), and alkaline phosphatase (ALP) were assessed at baseline, day 6, and day 19. Statistical analyses were performed by Student's t-test and mixed ANOVA. Mean intakes of all minerals during days 1-5 and mean Ca and Mg intakes during days 6-19 were greater in the treatment group compared to the control group. No group effect or group and time interaction was observed in serum biomarkers. Serum 1,25(OH)D increased while PTH and ALP tended to decrease on day 6 but returned to baseline values on day 20. Short-term intake of U. pinnatifida and Porphyra does not affect calcium metabolism in young Korean women with low calcium intakes.