• The Journal of Internal Korean Medicine
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• v.34 no.4
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• pp.405-411
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• 2013

Objectives : This study was designed to investigate the difference between genuine and pseudo halitosis about qi stagnation and stress. Methods : We recruited 63 halitosis patients who visited the halitosis clinic in the Kyung Hee University Korean Medicine Hospital from June 2012 to August 2013. We classified the halitosis patients into two groups, genuine and pseudo halitosis based on organoleptic assesment (OLT) score and evaluated the severity of self-reported halitosis using visual analog scale (VAS), amount of sulfide compounds using Halimeter, qi stagnation level using qi stagnation questionnaire and stress levels using heart rate variability (HRV) parameters. Results : Comparing the genuine halitosis group and the pseudo halitosis group, there was no significant difference in VAS of halitosis but significant difference in halimeter score. Distribution of qi stagnation and non-qi stagnation groups was significantly different between genuine and pseudo halitosis. Compared to the genuine halitosis group, the pseudo halitosis group showed a significant higher value of low frequency/high frequency ratio (LF/HF ratio). Conclusions : The result of this study suggest that there is significant difference about qi stagnation and stress level between genuine halitosis and pseudo halitosis patients, so when approaching pseudo halitosis patients, we should consider their psychological and emotional status.

• Atmosphere
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• v.30 no.4
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• pp.377-390
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• 2020

Not only emissions, but also atmospheric circulation is a key factor that affects local particulate matters (PM) concentrations in Korea through ventilation effects and transboundary transports. As part of the atmospheric circulation, air stagnation especially adversely affects local air quality due to weak ventilation. This study investigates the large-scale circulation related to air stagnation over Korea during winter and projects the climate change impacts on atmospheric patterns, using observed PM data, reanalysis and regional climate projections from HadGEM3-RA with Modified Korea Particulate matter Index. Results show that the stagnation affects the PM concentration, accompanied by pressure ridge at upper troposphere and weaken zonal pressure gradient at lower troposphere. Downscaling using HadGEM3-RA is found to yield Added-Value in the simulated low tropospheric winds. For projection of future stagnation, SSP5-8.5 and SSP1-2.6 (high and low emission) scenarios are used here. It has been found that the stagnation condition occurs more frequently by 11% under SSP5-8.5 and by 5% under SSP1-2.6 than in present-day climate and is most affected by changes in surface wind speed. The increase in the stagnation conditions is related to anticyclonic circulation anomaly at upper troposphere and weaken meridional pressure gradient at lower troposphere. Considering that the present East Asian winter monsoon is mainly affected by change in zonal pressure gradient, it is worth paying attention to this change in the meridional gradient. Our results suggest that future warming condition increase the frequency of air stagnation over Korea during winter with response of atmospheric circulation and its nonlinearity.

• International Journal of Fluid Machinery and Systems
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• v.6 no.2
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• pp.56-74
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• 2013

Stall stagnations in the system of axial-flow compressors and ducts occur in transition from deep surge conditions to decayed or converged stall conditions. The present study is concerned with the boundaries between the deep surges and the stagnation stalls on the basis of analytical results by a code on surge transients analysis and simulation. The fundamental acoustical-geometrical stagnation boundaries were made clear from examinations of the results on a variety of duct configurations coupled with a nine-stage compressor and a single stage fan. The boundary was found to be formed by three parts, i.e., B- and A-boundaries, and an intermediate zone. The B-boundary occurs for the suction-duct having a length of about a quarter of the wave-length of the first resonance in the case of very short and fat plenum-type delivery duct. On the other hand, the A-boundary occurs for the long and narrow duct-type delivery flow-path having a length about a fifth of the wavelength and relatively small sectional area in the case of short and narrow suction ducts. In addition to this, the reduced surge-cycle frequencies with respect to the duct lengths are observed to have respective limiting values at the stagnation boundaries. The reduced frequency for the B-boundary is related with a limiting value of the Greitzer's B parameter. The tendency and the characteristic features of the related flow behaviors in the neighborhood of the boundaries were also made clearer.

• Journal of Oriental Medical Thermology
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• v.1 no.1
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• pp.20-26
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• 2002

The flowing of Liver Qi upwards and outwards in all directions means importance especially for women because they are based on blood which is derived from Liver by the theory of oriental medicine. The function of Liver Qi is considered to be reflected at Rt. upper abdomen by meridian theory of oriental medicine. The body temperature was assesed ay DITI. Thermographic measurements were performed on 2 areas. All data were coded for computer analysis and significance were tested by unpaired T test. DITI revealed the significant hyperthermia of Rt. upper abdomen on the Liver Qi stagnation patients. These results suggest that the difference between upper and lower abdomen temperature is remarkably related to occurrence of Liver Qi stagnation. DITI may be favorable to the diagnosis and assessment of Liver Qi stagnation.

• 한국연소학회:학술대회논문집
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• 2014.11a
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• pp.225-226
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• 2014

An experimental study has been conducted to investigate the heat transfer characteristics of syngas/air mixture impinging jet flame with 10% hydrogen content. Effects of impinging distance, Reynolds number as major parameters on surface temperature of stagnation point were examined experimentally by the data acquisitions from k-type thermocouple. There were 2 times of maximum peak point of stagnation point with respect to the impinging distance for the investigation. As reynolds number increases, the nusselt number and convective heat transfer coefficient increased accordingly.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.6 no.3
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• pp.291-301
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• 1994

This paper presents the promotion of heat transfer through the use of wire-mesh screens. To improve heat transfer in an impingement water system, the wire-mesh screens are installed between the nozzle-to-heater surfaces. When the wire-mesh screens are not employed, this report exhibits the maximum heat transfer and the secondary maximum value at the stagnation point. But in case of using the wire-mesh screens, the transfer coefficient value of maximum heat exists at the stagnation point, and the second maximum value doesn't occur. Therefore, the heat transfer is more improved than 4~6 times that of the mean Nusselt numbers of simple water jet system, Also, within the region presented in this study, the heat transfer was promoted by using the wire-mesh screens at the stagnation point ; thus, the heat transfer was more increased than 6-7. 5 times that of simple water jet system.

• Journal of Magnetics
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• v.20 no.2
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• pp.114-119
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• 2015

This study explored the effect of pulsed magnetic field (PMF) stimulus on the improvement of blood stagnation by means of photoplethysmography (PPG). Our stimulus system was designed to generate PMF with a maximum intensity variation of 0.20 T at a transition time of $160{\mu}s$, with pulse intervals of 1 Hz. In order to quantitatively estimate vascular condition, indices such as blood vessel tension (BVT), stress power (SP), differential pulse wave index (DPI) and remained blood volume (RBV) were calculated from the second derivative of the PPG signal and power density spectrum (PDS). Our results showed that non-invasive PMF stimulus was effective in improving blood stagnation. Therefore, it may be concluded that appropriate PMF stimulus affects the blood circulatory system.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.05a
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• pp.901-904
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• 2002

The cutting thickness of ultra-precision machining is generally very small, only a few micrometer or even down to the order of a flew manometer. In such case, a basic understanding of the mechanism on the micro-machining process is necessary to produce a high quality surface. When machining at very small depths of cut, metal flow near a rounded tool edge become important. In this paper a finite element analysis is presented to calculate the stagnation point on the tool edge or critical depth of cut below which no cutting occurs. From the simulation, the effects of the cutting speed on the critical depths of cut were calculated and discussed. Also the transition of the stagnation point according to the increase of the depths of cut was observed.

• Herbal Formula Science
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• v.16 no.1
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• pp.1-13
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• 2008

The Oriental Medical Literature Relating to Treatment of Gyogamdan in Ki Stagnation : focused on Suseunghwagang The normal drift of a current Ki can maintain a function of body. An abnormal drift of a current Ki which is called a Ki Stagnation by lots of thinking or agony gets to a various disease syndrome. A Ki Stagnation is similar to a mental stress disease. It is a common disease for us to contact easily, so, it is very valuable to study. Gyogamdan which is composed of Cyperi Rhizoma L. and Poria cum Radix pini has been used by basic prescription of a symptom related to all kinds of Ki disease, after being recorded to Hongssijibhumbang first. Gyogamdan has an ability to regulate Ki , through 'Suseunghwagang-centric'(Ascending the Water and Descending the Fire) in body. Gyogamdan compares to Gamijajoohwan which can treat eyes dizzy by ascending heat and Gongjindan which can regulate lack of basic Ki through 'Suseunghwagang-centric'. It is general for the herb and acupuncture to give medical treatment coming together in oriental medicine, so do Gyogamdan and Sagwan Acupoints. Gyogamdan in composition Cyperi Rhizoma L. and Poria cum Radix pini and Sagwan Acupoints in composition Hapkok and T'aech'ung get to synergistic effects. Therefore, a Ki Stagnation treatment through unions of Gyogamdan and Sagwan Acupoints may have more effects than when a treatment used each one alone. Be considered that we have to study Gyogamdan and Sagwan Acupoints carried out an experiment to set up the previous theory in future

• The Journal of Internal Korean Medicine
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• v.41 no.4
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• pp.624-643
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• 2020

Objectives: The aim of this study was to analyze the correlation between Ryodoraku and two pattern-identification questionnaires in patients with Burning Mouth Syndrome (BMS). Methods: The study participants were 30 patients with BMS who visited the Oral Diseases Clinic of Kyung Hee Oriental Medicine Hospital from June to November, 2019. The Ryodoraku test and two pattern-identification questionnaires were administered to all patients. Measurements included the average Ryodoraku score, which is called the Total Average (TA), and each score on the Ryodoraku point scale. The degree of Yin-deficiency, Qi-stagnation, and pain were assessed with the Yin-deficiency Questionnaire (YDQ), Qi-stagnation Questionnaire (QSQ), and Visual Analogue Scale (VAS), respectively. Results: The average TA score was 29.90. The LF5 (p=0.013) and RF5 (p=0.016) scores were lower than the TA scores, and the RH5 (p=0.020) and RH6 (p=0.006) scores were higher than the TA scores. A negative correlation was detected between the YDQ scores and the LH1 (r=-0.366, p=0.046), LH2 (r=-0.507, p=0.004), LH3 (r=-0.374, p=0.042), RH1 (r=-0.361, p=0.050), RH2 (r=-0.403, p=0.027) points. The LF5 (p=0.050) and RF2 (p=0.048) scores were lower in the patients with Qi-stagnation patients than without Qi-stagnation. Conclusions: Our results suggest that low TA and Ryodoraku scores on LF5 and RF5 and high Ryodoraku scores on RH5 and RH6 could be quantitative indicators for the diagnosis of BMS. The LH1, LH2, LH3, RH1, RH2, LF5, and RF2 scores could also be an indicators for diagnosis of Yin-deficiency and Qi-stagnation in patients with BMS.