• Journal of Korea Multimedia Society
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• v.10 no.8
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• pp.981-996
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• 2007

In this paper, we describe a method that can recognize gestures by obtaining motion features information with principal factor analysis from sequential gesture images. In the algorithm, firstly, a two dimensional silhouette region including human gesture is segmented and then geometric features are extracted from it. Here, global features information which is selected as some meaningful key feature effectively expressing gestures with principal factor analysis is used. Obtained motion history information representing time variation of gestures from extracted feature construct one gesture subspace. Finally, projected model feature value into the gesture space is transformed as specific state symbols by grouping algorithm to be use as input symbols of HMM and input gesture is recognized as one of the model gesture with high probability. Proposed method has achieved higher recognition rate than others using only shape information of human body as in an appearance-based method or extracting features intuitively from complicated gestures, because this algorithm constructs gesture models with feature factors that have high contribution rate using principal factor analysis.

• Journal of Labour Economics
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• v.29 no.3
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• pp.49-74
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• 2006

Even though the foreign currency crisis in 1997 and the introduction of Inflation Targeting(IT) have been considered as key factors for current low inflation, there have been few attempts to explain what is the contribution of the dynamics of wage and price to the low inflation. This study is to analyze the relation between wage and price especially focusing on how it through the economic events using cointegration instability tests. The result shows that the short and long-run relation between two have variables have changed through the period of 1997~1999. In the first subperiod, wage tended to respond immediately to inflation shocks, whereas price responded to wage shocks in a long-run. Moreover, the cointegration coefficient of price was equal to 1. In the second subperiod, however, the dynamics from price to wage has been weakened and the real wage has declined apparently. These findings mean that the workers have failed to raise their wage at the rate of inflation, that is, the so-called wage-price spiral was broken for the second subperiod. The implication of this study is that the relatively weak bargaining power of workers, or the condition of labor market, is one of the primary factors of the current low inflation.

• The Bulletin of The Korean Astronomical Society
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• v.42 no.2
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• pp.48.3-49
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• 2017

Interplanetary space of the solar system contains a large number of dust particles, referred to as Interplanetary Dust Particles (IDPs) cloud complex. They are observable through meteors and zodiacal lights. The relative contribution of possible sources to the IDPs cloud complex was an controversial topic, however, recent research (Yang & Ishiguro, 2015 and references therein) suggested a dominance of cometary origin. In this study, we numerically investigated the orbital evolution of cometary dust particles, with special concerns on different evolutionary tracks and its consequences according to initial orbits, size and particle shape. The effect of dust particle density and initial size-frequency distribution (SFD) were not decisive in total cloud complex mass and mass supply rate, when these physical quantities are confined by observed zodiacal light brightness and dust particle SFD at 1 au. We noticed that, if we assume the existence of fluffy aggregates discovered in the Earth's stratosphere and the coma of 67P/Churyumov-Gerasimenko, the required mass supply rate decreases significantly. We also found out that close encounters with planets (mostly Jupiter) are the dominating factor of the orbital evolution of dust particles, as the result, the lifetime of cometary dust particles are shorter than Poynting-Robertson lifetime (around 250 thousand years). As another consequence of severe close encounters, only a small fraction of cometary dust particles can be transferred into the orbit < 1 au. This effect is significant for large size particles of ${\beta}$ < 0.01. The exceptional cases are dust particles ejected from 2P/Encke and active asteroids. Because they rarely encounter with Jupiter, most dust particles ejected from those objects are governed by Poynting-Robertson effect and well transferred into the orbits of small semimajor axis. In consideration of the above effects, we directly estimated probability of mutual collisions between dust particles and concluded that mutual collisions in the IDPs cloud complex is mostly ignorable, except for the case of large sized particles from active asteroids.

• Natural Product Sciences
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• v.5 no.1
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• pp.25-32
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• 1999

The pharmacological actions of ambrein were investigated alone or in combination as a pretreatment with agonists (adrenaline, noradrenaline, acetylcholine, histamine, nicotine), antagonists (atropine, atenolol) and calcium channel blocker (verapamil) in vivo in anaesthetized SWR rats using blood pressure, heart rate and myocardial contractility as parameters. Ambrein in the dose range of 50-200 mg/kg to the normotensive anaesthetized rats demonstrated negative chronotropic effect and increased the myocardial contractility significantly. At the mid dose (100 mg/kg) this increase in contractile force was 36% and 44% above the normal at 30 min and 60 min intervals post-treatment, respectively. Both of the lower and high doses (50 mg/kg and 200 mg/kg) had similar effects. Furthermore, this contractile response was dose related. Also, this compound produced a considerable increase in myocardial contractility when used as a pretreatment with some agonists and antagonists. The results on blood pressure did not show a considerable change when ambrein was used alone. However, ambrein pretreatment at the dose of 100 mg/kg did not block the effects of adrenaline, noradrenaline, isoprenaline and acetylcholine on heart rate and blood pressure. On the other hand, this pretreatment attenuated the sympathoadrenal effects of nicotine significantly. Chronotropic and blood pressure changes produced by histamine were also inhibited by ambrein pretreatment. This pretreatment significantly reversed the effects of atenolol but failed to demonstrate any change in the negative chronotropic, inotropic and hypotensive responses induced by verapamil. It is concluded that ambrein induced nonselective dose dependent antagonism of the effects of some agonists and antagonists require contribution of some neuromediators. However, the positive isotropic effects of ambrein possibly involve the enhancement of slow Ca channels and/or activation of ${\beta}-adrenergic$ receptors in the heart. At this moment it is difficult to explain the exact mode of action of ambrein and the studies dealing with Ca channel blocker and adrenergic blocker followed by ambrein may help to define the factors which contribute to its positive inotropic effects.

• The Journal of Internal Korean Medicine
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• v.40 no.6
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• pp.1169-1178
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• 2019

Objective: The purpose of this study was to investigate the effect of combined therapy with Banhasasim-tang and conventional treatment for atrophic Gastritis. Methods: The study collected data of clinical studies of combined therapy with Banhasasim-tang and conventional treatment for atrophic gastritis. Electronic databases were used, including PubMed, Cochrane, CNKI, Wanfang, CINII, J-stage, NDSL, and OASIS. The main search terms included such as "Atrophic Gastritis", "Banhasasim-tang", "BanXia Xiexin Tang". This study only included randomized controlled trials (RCTs) that adopted combined therapy with Banhasasim-tang and conventional treatment for atrophic gastritis. Results: A total of 18 RCTs were selected. They all adopted combined therapy with Banhasasim-tang and conventional treatment for atrophic gastritis. In all the studies, the intervention group significantly improved the score of effective rate, and in the 8 studies, Hp negative conversion rate was significantly improved when Banhasasim-tang was taken. Conclusion: Through the analysis of 18 RCTs, we found Banhasasim-tang combined with conventional therapy were more effective in the positive performance of atrophic gastritis than conventional therapy single contribution. However, due to the low quality of the selected studies and the lack of endoscopy, biopsy, follow-up observation, so there is a slight insufficient to prove its conclusion. Therefore, we hope that more systematic and diverse clinical studies will be conducted.

• The Journal of Korean Association of Computer Education
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• v.6 no.1
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• pp.41-54
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• 2003

Educational web sites are proliferating at an astonishing rate, however many of those web sites are of poor or unknown quality. Educators are in need of instruments to assist in evaluating educational web sites for authenticity, applicability, authorship, bias, and usability, etc. The ability to critically evaluate educational content form numerous web sites is an important skill in this information age. In this paper, indicators of educational web site quality have been identified from literature review and our own research, and classified within 8 categories. To test the relative contribution of each indicator to the satisfaction level from using educational web sites, a questionnaire survey was administered. Subjects were asked to visit the educational web site of his or her choice and rate the quality level of each indicator. 255 completed questionnaires were turned in for analysis. Cronbach's Alpha test and factor analysis were applied to test the reliability and validity of the data. Stepwise regression analysis was applied to test the relationship between the satisfaction level and 14 independent factors. Implications from the statistical analysis as well as the guidelines for evaluating educational web sites were provided.

• Asian-Australasian Journal of Animal Sciences
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• v.10 no.3
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• pp.318-323
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• 1997

In order to assess the effect of solar exposure on pulmonary functions and evaporative losses from skin and pulmonary surfaces, in six healthy Sahiwal (S) and six Sahiwal ${\times}$ Holstein ($S{\times}H$) cattle were exposed to direct sun during summer. Breed differences were observed during exposure. Increase in sweating rate was higher in crossbreds (222%) than in Sahiwal (125%). Pre-exposure (ambient temperature, $32.6{\pm}0.85^\circ}C$, solar radiation, $0.9cal\;cm^{-2}min^{-1}$) evaporative loss from skin accounted for about 90% of the losses and remaining losses were contributed by pulmonary surfaces in Sahiwal. The contribution of evaporation through skin increased to 92% (ambient temperature $39.4{\pm}0.68^\circ}C$, solar radiation, $1.35cal\;cm^{-2}min^{-1}$). In crossbreds 80% of the evaporative losses were through skin before exposure which increased to 87% after exposure to solar radiations. Rectal temperature increase was higher in crossbreds ($1.5^{\circ}C$) than in Sahiwal ($0.8^{\circ}C$). With the increase in pulmonary evaporative losses, respiratory frequency increased to 2 fold in Sahiwal and pulmonary ventilation increased 1.6 times the resting value in Sahiwal due to solar exposure. In $S{\times}H$ crossbreds the respiratory frequency increased 3.5 times and pulmonary ventilation increased only to 1.8 times due to decrease in tidal volume. There was about 2 fold increase in alveolar ventilation in both the breeds, the increase in dead space ventilation was more in crossbreds than in Sahiwal. Behavioral symptoms exhibited by animals after exposure were profuse salivation, open mouth panting, tongue protrusion and general restlessness.

• Korean Journal of Adult Nursing
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• v.17 no.2
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• pp.320-330
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• 2005

Purpose: This is for analyzing the recent citations from papers enrolled in the Journal of Korean Academy of Nursing and understanding correct marking of references. Method: Targeted 2,334 references in 93 articles introduced from Feb. 2002 to Dec. 2002 which are applied current contribution rules of the Journal of Korean Academy of Nursing. Result: 1. 25 references are quoted per article and particularly foreign journals are most frequently quoted. Among foreign journals, Nursing Research is most frequently used. The Journal of Korean Academy of Nursing is also mostly referred material among national journals. 2. The retrieval rate is prove to be 1,539(83.8%) and 267(11.7%) are without errors and the other 2,022 have at least more than one error regardless of frequency. 3. Major error rate of periodical publication is 484(36.8%) and most occurred in the inconsistency of titles between articles and references. 4. Foreign journals have much more errors than national ones concerning periodical publications. Conclusion: Correct citation and marking of references can be achieved through strict reviewing process by authors, editors, publishers and paper investigators. In consequence, it is expected that these processes can cause improvement of quality in impact factor and papers.

• Journal of the Korean Chemical Society
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• v.26 no.1
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• pp.1-6
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• 1982

The addition of thiophenol to ${\alpha}$-methylstyrene has been studied MO theoretically using CNDO/2 method. Although overall reaction proceeds in two steps i.e., (1) decomposition of thiophenol to give phenylthiyl radical and (2) addition of the radical to ${\alpha}$-methylstyrene to give a new monomer radical, theoretical results suggested that the phenylthiyl radical formation step, (1), was the dominant process in determining the rate of addition; this was the rationale behind the negative ${\rho}$ value obtained experimentally from the Hammett plots for substituents on the thiyl radicals. The departure from a linear Hammett plot for addition of ${\rho}$-chlorophenylthiyl and m-trifluoromethyl phenylthiyl to ${\rho}$-methoxy-${\alpha}$-methylstyrene could be explained as a result of an increased contribution of the addition step, (2) to the overall reaction rate.

• Journal of Power Electronics
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• v.16 no.2
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• pp.685-694
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• 2016

This paper presents a reliability assessment model for the power semiconductors used in wind turbine power converters. In this study, the thermal loadings at different timescales of wind speed are considered. First, in order to address the influence of long-term thermal cycling caused by variations in wind speed, the power converter operation state is partitioned into different phases in terms of average wind speed and wind turbulence. Therefore, the contributions can be considered separately. Then, in regards to the reliability assessment caused by short-term thermal cycling, the wind profile is converted to a wind speed distribution, and the contribution of different wind speeds to the final failure rate is accumulated. Finally, the reliability of an actual power converter semiconductor for a 2.5 MW wind turbine is assessed, and the failure rates induced by different timescale thermal behavior patterns are compared. The effects of various parameters such as cut-in, rated, cut-out wind speed on the failure rate of power devices are also analyzed based on the proposed model.