• 한국컴퓨터정보학회논문지
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• 제15권1호
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• pp.207-217
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• 2010

미국의 서브프라임 모기지 사태로 세계 주식시장의 폭락을 가져왔다. 개인 투자자는 외국인과 기관에 비해 손실률이 더 큰 것으로 판단되었다. 따라서 인터넷 HTS를 이용한 주식투자에 있어서 좀 더 과학적이고 기계적인 투자가 필요하다. 본 논문은 하락기 하락조정기 상승기 상승조정기에 개인 기관 외국인 Knowledge Base HTS를 이용한 주식 수익률 분석이다. Knowledge Base HTS인 e-friend를 설치한다. HTS 툴인 추세선, MACD, Bollinger Bands, Stochastic slow의 기능을 이용하여 HTS가 실제 주식 거래에서의 종합주가지수와 기관의 펀드수익률, 외국인 수익률을 비교분석 한다. 일반적으로 5개 종목을 거래한다는 가정 하에 하락기, 하락조정기, 상승기, 상승조정기에 있어서 소형주 5개, 중형주 5개, 대형주 5개의 수익률을 비교함으로서, 실제적인 하락률과 상승률에 관한 수익(손실)율을 비교 연구하여 금융 IT 분야 발전을 연구하는데 의의가 있다.

• 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.

• 한국군사과학기술학회지
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• 제12권6호
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• pp.760-767
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• 2009

This thesis focuses on the study of high-power, coupled-cavity traveling-wave tube(CCTWT) for radar applications. The CCTWT employed a reentrant double-slot staggered RF cavity structure. Computational analysis of the X-band, double-slot staggered structures is carried out through the use of HFSS code, which solves Maxwell's equations fully in three-dimensions. The non-linear, large-signal performance of CCTWTs are predicted from numerical simulations using a three-dimensional particle-in-cell code, MAGIC3D. With beam voltage set to 12.7~13kV and beam current at 300mA, the CCTWT produces a saturated radiation power of 350~430W, corresponding to an electronic efficiency of 8.9~11.2% and a gain of 23.7~24.2dB within a frequency range of 7.9~8.4GHz.

• 수면정신생리
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• 제1권1호
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• pp.36-46
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• 1994

The event-related potentials are difined as the changes in voltage that occur at paticular time before, during and after something that happens in the physical world or some psychological processes. The possibilities of clinical applications of ERP are considered because the endogenous potentials such as P3 and contingent negative variation(CNV) are determined by the psychological significance of the stimulus. The P3 is a positive wave that occurs when a subject detects an informative task-relevant stimulus. The P3 amplitude and latency are affected by the various factors as subjective probabilites, stimulus meaning and information transmission. It is suggested that P3 wave is associated with the decision making, cognitive or perceptual closure, memory updating and transfer of information to consciousness etc. Although the intracerebral origin of the P3 wave is not known, the P3 may have multiple intracerebral generators. The CNV is a slow potential shift occuring during the foreperiod, between warning and response signals, in a reaction time experiment. It is related to expectancy, preparation etc. The abnormal findings of P3 wave and CNV in various psychiatric disorders are also discussed.

• 한국음향학회:학술대회논문집
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• 한국음향학회 2001년도 추계학술발표대회 논문집 제20권 2호
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• pp.209-212
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• 2001

수중에서 물과 공기 다공을 갖는 다공성 매질의 주파수 및 다공율 변화에 따른 음향특성을 고찰하였다. 다공성 매질로서 원통형 다공을 인위적으로 균일하게 배열한 판형 루사이트 (Lucite)를 사용하였다. 수중에서 음파를 다공성 매질의 원통형 다공의 축 방향과 평행하게 입사하였을 때, 빠른 파 (fast wave)는 다공 내의 매질에 영향을 받지 않으나, 느린 파 (slow wave) 및 원통형 다공을 전파하는 비평면 고차 정상 모드 파 (nonplanar higher normal mode wave)는 다공 내의 매질에 크게 영향을 받는다. 3MHz부터 4MHz까지의 주파수 영역에서 전체 파 (total wave), 빠른 파 및 느린 파의 음속 및 음압투과계수를 주파수 및 물과 공기 다공율 변화에 따라 측정하였다. 비강체 다공성 매질에서의 음파 전파특성에 대한 MBA (modified Biot-Attenborough) 모델의 이론 결과와 실험결과를 비교, 분석하였다.

• Korean Journal of Acupuncture
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• 제23권2호
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• pp.105-111
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• 2006

Objectives: We investigated the effect of electroacupuncture on epileptic rat model and its underlying mechanisms on suppression of the epilepsy. Methods: It was used pentylenetetrazol $(35{\sim}40\;mg/kg.\;i.p)$ induced epileptic rat model and square wave electrical stimulations (5 mA, 5, 40 or 80 Hz frequency) was applied to acupoints on 'Dazhui' and 'Taichong' for 30min. Results: Electroacupuncture suppressed spikes and slow waves of EEG due to the epileptic condition. Out of electroacupuncture, a high frequency of 80Hz had a better effect for suppress epileptic EEG wave. Conclusions: Electroacupuncture can markedly reduce the excitability of cerebral cortex and strengthen the inhibitory process, checking epilepsy wave. Some intrathalamic nuclei have a promoting or inhibiting effect on epileptic EEG wave. This experimental study we are proposed to Electro-acupuncture can suppression epileptic rat model and it's scientific mechanisms.

• 한국자기학회지
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• 제22권1호
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• pp.27-31
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• 2012

영구자석과 홀소자로 구비된 두 대의 집게형 맥진기 시제품을 이용하여 비가압 상태에서 양손 요골동맥의 맥진파형을 동시측정한 신호들을 비교 분석하였다. 20대 남성 피실험자 22명을 대상으로 측정된 오른손잡이와 왼손잡이의 두 맥진파형들은 위상차를 갖고 뚜렷하게 구별되었다. 서로 다른 빠름과 늦음으로 인해 두 개의 맥진파형들의 위상차 부호는 맥파전달속도가 오른손과 왼손 혈관의 총길이 보다는 자주 사용하는 팔의 근육 특성에 의존한다는 분석이 가능하였다.

• The Korean Journal of Physiology and Pharmacology
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• 제2권3호
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• pp.361-368
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• 1998

The spontaneous contractions of gastric smooth muscles are regulated by slow waves, which are modulated by both nervous system and humoral agents. This study was designed to examine the effects of prostaglandin $E_2$ ($PGE_2$) on the contractile and electrical activities of antral smooth muscles in guinea-pig stomach, using an intracellular recording technique. To elucidate the underlying mechanism for its effect on contractility, ionic currents were also measured using a whole-cell patch clamp method. The basal tone by $PGE_2$ was variable, whereas the magnitude of phasic contractions was reduced ($19.0{\pm}2.1%$, n=19). The resting membrane potentials were hyperpolarized ($-4.4{\pm}0.5%$ mV, n=10), and plateau potentials were lowered ($-2.9{\pm}0.5%$ mV, n=10). In most cases, however, the initial peak potentials of slow waves were depolarized more by $PGE_2$ than those of control. The frequency of the slows wave was increased from $5.7{\pm}0.2$ cycles/min to $6.5{\pm}0.2$ (n=22). Voltage-operated $Ca^{2+}$ currents were decreased by $PGE_2$ (n=5). Voltage-operated $K^+$ currents, both Ca-dependent and Ca-independent, were increased (n=5). These results suggest that $PGE_2$ plays an important role in the modulation of gastric smooth muscle activities, and its inhibitory effects on the contractility and activities of slow waves are resulted from both decrease of $Ca^{2+}$ currents and increase of $K^+$ currents.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 하계학술대회 논문집
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• pp.392-393
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• 2009

The study is aimed at studying a weakly relativistic oversized BWO with a Bragg reflector entrance of SWS. The Bragg reflector reflects microwaves, while it is open for beam propagations. By changing the boundary condition at the beam entrance, the effect of the Bragg reflector on the BWO performance is examined.

• Journal of Astronomy and Space Sciences
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• 제24권2호
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• pp.119-124
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• 2007

The relation between substorm occurrences and HILDCAA events has been an issue. We have studied the association of particle injections with substorm onsets during HILDCAA intervals for the first half of year 2003. The examination of aurora images observed by IMAGE spacecraft and electron flux data measured by LANL satellites exhibits a close association of repetitive particle injections with substorm activity. We also find that HILDCAA events can occur equally frequently during slow speed solar wind streams as long as the interplanetary magnetic field exhibits Alfvenic wave feature.