• 아태비즈니스연구
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• 제13권2호
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• pp.23-37
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• 2022

Purpose - The purpose of this paper is to analyze the dynamic factors of the daily FX implied volatility based on the fractional integration methods focusing on long memory feature and structural changes. Design/methodology/approach - This paper uses the daily FX implied volatility data of the EUR-USD and the JPY-USD exchange rates. For the fractional integration analysis, this paper first applies the basic ARFIMA-FIGARCH model and the Local Whittle method to explore the long memory feature in the implied volatility series. Then, this paper employs the Adaptive-ARFIMA-Adaptive-FIGARCH model with a flexible Fourier form to allow for the structural changes with the long memory feature in the implied volatility series. Findings - This paper finds statistical evidence of the long memory feature in the first two moments of the implied volatility series. And, this paper shows that the structural changes appear to be an important factor and that neglecting the structural changes may lead to an upward bias in the long memory feature of the implied volatility series. Research implications or Originality - The implied volatility has widely been believed to be the market's best forecast regarding the future volatility in FX markets, and modeling the evolution of the implied volatility is quite important as it has clear implications for the behavior of the exchange rates in FX markets. The Adaptive-ARFIMA-Adaptive-FIGARCH model could be an excellent description for the FX implied volatility series

• Asian Pacific Journal of Cancer Prevention
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• 제15권1호
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• pp.407-411
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• 2014

Objective: To observe local and systemic toxicity after sustained-release 5-fluorouracil (5-Fu) implantation in canine peritoneum and para-aortic abdominalis and the changes of drug concentration in the local implanted tissue with time. Methods: 300 mg sustained-release 5-Fu was implanted into canine peritoneum and para-aorta abdominalis. Samples were taken 3, 5, 7 and 10 days after implantation for assessment of changes and systemic reactions. High performance liquid chromatography was applied to detect the drug concentrations of peritoneal tissue at different distances from the implanted site, lymphatic tissue of para-aortic abdominalis, peripheral blood and portal venous blood. Results: 10 days after implantation, the drug concentrations in the peritoneum, lymphatic tissue and portal vein remained relatively high within 5 cm of the implanted site. There appeared inflammatory reaction in the local implanted tissue, but no visible pathological changes such as cell degeneration and necrosis, and systemic reaction like anorexia, nausea, vomiting and fever. Conclusions: Sustained-release 5-Fu implantation in canine peritoneum and para-aortic abdominalis can maintain a relatively high tumour-inhibiting concentration for a longer time in the local implanted area and portal vein, and has mild local and systemic reactions. Besides, it is safe and effective to prevent or treat recurrence of gastrointestinal tumours and liver metastasis.

• 한국콘텐츠학회논문지
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• 제14권12호
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• pp.764-774
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• 2014

본 연구의 목적은 지역 주민의 보편적인 양상으로 나타나고 있는 주관적인 정신건강이 지역 주민들의 삶에 내재되거나 변화되고 있는 사회적 자본인 신뢰, 사회참여, 네트워크역량, 지역사회의식과 어떤 관계를 가지고 있는가이다. 지역 주민의 삶의 질과 관련된 여러 선행연구에서 사회적 자본과의 긍정적인 관계를 설명하듯이 사회적 자본의 축적과 변화가 지역 주민의 주관적인 정신건강에 어떠한 영향을 미치는 것인지 살펴보고자 한다. 연구결과, 2010년도는 지역사회의식만이 정신건강에 영향을 미치는 것으로 나타났으며, 2011년도는 지역사회의식과 네트워크역량이 높을수록 지역 주민의 정신건강 점수도 높았지만, 사회참여는 참여가 많을수록 정신건강 점수가 낮게 나타났다. 2012년도는 지역사회의식과 네트워크역량이 높을수록 지역 주민의 정신건강 점수도 높게 나타났다. 또한 정신건강 점수가 높은 집단에서 모든 사회적 자본의 구성요소가 높은 주민들의 수가 가장 많았으며, 정신건강 점수가 낮은 집단에 비해 사회적 자본이 높은 주민들이 더 많았다. 사회적 자본 축적의 정도와 변화는 지역 주민의 정신건강에 간접적으로 작용하고 있음은 알 수 있었다.

• 한국콘텐츠학회논문지
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• 제12권7호
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• pp.194-202
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• 2012

이 연구는 지방의회 발전방향을 모색하고자 주민들을 대상으로 한 설문조사를 바탕으로 행태학적 관점에서 경험적 연구를 실시하였다. 연구를 통해 얻어진 결과를 요약해 보면 다음과 같다. 첫째는 의회의 본질적 역할(주민대표, 견제, 입법기능)에 대한 평가결과 주민들은 대체적으로 발전하지 못하고 있는 것으로 나타났으며, 의정활동과 행정변화의 체감에서도 큰 변화를 체감하지 못하는 것으로 나타났다. 둘째, 의회활동의 세부평가결과 주민들은 주민의견수렴, 의견수렴전담부서 등이 매우 중요하다고 평가하는 것으로 나타났다. 셋째, 지방의회의 발전적 평가에서는 전문성확보를 위해 외부전문가 도입과 주민참여활성화제도의 확립이 중요하다고 평가하는 것으로 나타났다. 이러한 결과는 지방의회의 발전을 위해서 의회가 주민들과 소통과 타협을 통해 책임성 있는 역할이 적극적으로 수행하는 것이 중요하다는 결과를 얻을 수 있었다. 이러한 연구결과는 지방의회의 발전방향에 대한 실무적, 이론적으로 설명하는데 기여할 것으로 판단된다.

• The Korean Journal of Ecology
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• 제21권6호
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• pp.809-814
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• 1998

Changes of annual seed production related to climate change were studied for 12 years in Piagol, a riparian valley in Mt. Jiri. Sixty-four seed traps (sized 0.5 ${\times}$ 0.5 $m^{2}$) were set up on the forest floor of surveyed area. Seeds were collected from these traps at an interval of 15 days from September to November since 1984. Vegetation of the study area was mainly consisted of the naturally regenerated Carpinus tschonoskii in the tree layer. Acer mono, Quercus serrata, Carpinus laxiflora and Symplocos chinensis also appeared in the same layer. Maximum production occurred in 1984 and 1994. As a result of comparing seed production with local climate factors for 12 years, seed productivity and the year of maximum production of Carpinus forest were merely related with precipitation, air temperature and duration of sunshine among local climate factors. Duration of sunshine was, however, not contributed to periodically high productivity of seed of riparian valley carpinus forest.

• East Asian mathematical journal
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• 제40권2호
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• pp.127-148
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• 2024

Maximum and minimum have a historical background in mathematics and occupy an important part of the differential unit in school mathematics. As the curriculum is revised, there are changes and problems in the way definition introduced. Therefore, this study analyzes the changes in the method of introducing maximum and minimum definitions following the reorganization of the 2007 and 2009 revised mathematics curriculum, and analyzes the differences in maximum and minimum definition methods compared to the nine mathematics II textbooks in the 2015 revised mathematics curriculum and three real analysis. In addition, methods to improve the terms used in relation to the maximum and minimum values are presented.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
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• pp.71-77
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• 2008

Microstructural changes may arise due to the particle vanishing, fluid diffusion, heating, etc. This study focuses on the changes in small-strain shear stiffness in k0 loading produced by local straining in particular system made of sand-salt mixtures. Local strains were induced by dissolution of salt particles. Experiments were carried out in a conventional oedometer cell equipped with bender elements. Axial displacement and shear wave signals are recorded at each loading stage and during saturation process. Experimental data showed that microstructural changes due to particle vanishing were clearly captured by using shear wave measurement. Saturation of sand-salt mixture at a larger axial stress did not always create a more condense soil at the end of loading stage. Sand-salt mixture is useful for laboratory test on controlled artificial specimen.

• Journal of Acupuncture Research
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• 제36권1호
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• pp.21-27
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• 2019

Background: The intelligent tissue hypothesis holds that an organ's states (be it normal function or stressed states) are reflected in real time at its related acupuncture points (acupoints), causing physical, real-time changes in the local tissue. The experiment was devised to test this. Methods: The patient drank chilled water while the impedance at 6 stomach-related acupoints was monitored in real time (sample rate of 1 kHz). Any changes in the local tissue at the acupoints ought to be reflected in changes in the impedance. Results: The impedance at every test acupoint showed a response to the chilled water being ingested. Also, the duodenal pacesetter and the stomach's slow waves were clearly visible in the impedance pattern at all the acupoints. Conclusion: Hence, many separate details of the stomach's function were reflected at these acupoints. The duodenal features were consistent with the traditional indications for these acupoints, which are noted to be able to treat intestinal conditions. Therefore, the results were consistent with the hypothesis and also provided a possible explanation for how the use of these acupoints is able to treat intestinal conditions.

• Journal of the Optical Society of Korea
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• 제20권6호
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• pp.745-751
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• 2016

A detection algorithm, based on the combined local-global (CLG) optical-flow model and Gaussian pyramid for a moving target appearing against a dynamic background, can compensate for the inadaptability of the classic Horn-Schunck algorithm to illumination changes and reduce the number of needed calculations. Incorporating the hypothesis of gradient conservation into the traditional CLG optical-flow model and combining structure and texture decomposition enable this algorithm to minimize the impact of illumination changes on optical-flow estimates. Further, calculating optical-flow with the Gaussian pyramid by layers and computing optical-flow at other points using an optical-flow iterative with higher gray-level points together reduce the number of calculations required to improve detection efficiency. Finally, this proposed method achieves the detection of a moving target against a dynamic background, according to the background motion vector determined by the displacement and magnitude of the optical-flow. Simulation results indicate that this algorithm, in comparison to the traditional Horn-Schunck optical-flow algorithm, accurately detects a moving target undergoing illumination changes against a dynamic background and simultaneously demonstrates a significant reduction in the number of computations needed to improve detection efficiency.

• 한국콘텐츠학회논문지
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• 제9권4호
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• pp.172-180
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• 2009

본 연구는 지역 지상파 방송의 프로그램 분석을 통해 지역 방송의 프로그램 제작 현황 변화를 살펴보았다. 현재 지역 방송의 큰 변화는 지역 콘텐츠의 자체제작 강화와 지역 방송사 간의 공동제작의 확대이다. KBS대전의 경우 영남권을 중심으로 지역 총국들 간의 연대를 통한 다양한 공동제작 프로그램을 활성화시키고 있으며, 대전MBC의 경우도 2002년부터 19개 지역MBC를 5개 권역으로 묶어 공동 제작시스템을 구축하여 경쟁력을 강화하고 있으며, TJB는 부산 강원 전주 울산 대구 대전 민방이 각기 다른 콘텐츠 프로그램을 제작하여 공유하는 시스템을 선보이고 있다. 결론적으로 지역 방송은 중앙네트워크의 중계소 기능에서 벗어나 프로그램 '제작소스'로서 기능할 수 있도록 자체제작 능력이 강화되어야 하며, 이를 위해 각 지역 방송사간의 지역콘텐츠를 공동 제작하는 프로그램의 확대와 지역 방송국자체 제작 프로그램의 편성비율이 확대되어야만 자생력을 갖출 수 있을 것이다.