• Journal of Korean Society for Atmospheric Environment
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• v.19 no.6
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• pp.679-687
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• 2003

In this study, we investigated the analytical techniques to quantify the ambient concentration of hydrogen sulfide (H$_2$S) in air at ppt concentration level. For this purpose, an on-line GC analytical system equipped with both pulsed-flame photometric detector (PFPD) and thermal desorption unit (TDU) was investigated by collecting ambient air samples. The results of our study generally indicated that calibration conditions of GC system is highly sensitive to affect the accuracy of the analytical technique. Most importantly. we found that the use of different matrices in the the preparation stage of working standards was sensitive to control the overall performance of this technique. The calibration of our analytical system was tested by the two types of working standard (prepared by mixing either with high purity $N_2$ or with the ambient air). According to this test, the latter represented more efficiently the detecting conditions of actual air samples. The peak occurrence patterns of both air samples and standards (prepared by mixing with ambient air) were altered in a similar manner as the function of the loaded volume; however, it was not the case for the $N_2$-mixed standards. Results of our study suggest that detection of H$_2$S is highly different from other sulfides and that its quantification requires minimiaing interfering effects of non -pure substance (like water vapor) and (either sorptive or destructive) loss effects.

• Journal of Haehwa Medicine
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• v.25 no.1
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• pp.63-69
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• 2016

이 임상례는 근육 경직으로 인한 견비통에 태충혈이 유효함을 제시하고 있다. 환자의 주관적인 만족도를 평가하기 위해 점수식 평점 척도(Numerical rating scale;NRs)를 측정하였고 어깨 경직의 객관적인 호전 정도를 평가하기 위하여 양측 견정혈의 통증 통각 역치(Pressure pain threshold;PPT)와 어깨 외전력, 어깨관절의 외전시 가동범위(Range of motion;ROM)을 측정하였다. 양측 태충혈에 15분간 유침 후 NRS는 5에서 2로 감소하였다. 치료 전 왼쪽 견정혈의 PPT는 19N이었고 오른쪽은 22N이었다. 치료 후 왼쪽 견정혈의 PPT는 22N이었고 오른쪽은 27N이었다. 치료 전 견관절의 외전력은 왼쪽에서 29N, 오른쪽에서 22N으로 측정되었다. 치료후 견관절의 외전력은 왼쪽에서 33N, 오른쪽에서 22N으로 측정되었다. 견관절 ROM은 치료 전과 후 동일하게 왼쪽 관절 170도, 오른쪽 관절 165도로 나타났다. 결론적으로, 태충혈 자극은 어깨의 경직을 해소하고 어깨 근력을 강화하는 것으로 나타났다. 또한 그것은 상부 승모근의 압통을 감소시킬 수 있다. 이러한 측면에서, 태충혈의 효과에 대해서 보다 추가적인 연구가 필요할 것으로 보인다.

• Korean Journal of Veterinary Research
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• v.20 no.1
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• pp.17-24
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• 1980

In order to know the effects of thyroid hormone on the bursa of Fabricius in chicken, the bursae were studied with the light microscope after administration of thyroxine(TX) or propylthiouracil(PPT). Macroscopically, the bursa of TY-treated group showed increase in size and thickened folds. while those of the PPT-treated group decrease in size, compared with those of control group. In the light microscopic studies, the bursa of Fabricius of the TX-treated group showed active cell-divisions in the medulla, and increased number of pyroninophilic large lymphocytes and plasma cells containing PAS positive materials in the cytoplasms. On the other hand, the bursa from PPT-treated group revealed decreased number of lymphocytes, significant increase of necrotic lymphocytes in the follicles, and the proliferation of the interfollicular connective tissues. A large number of pyroninophilic lymphocytes and plasma cells were also appeared in the spleen of the TX-treated group.

• Journal of Ginseng Research
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• v.46 no.6
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• pp.711-721
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• 2022

The immune system is one of the most important parts of the human body and immunomodulation is the major function of the immune system. In response to outside pathogens or high inflammation, the immune system is stimulated or suppressed. Thus, identifying effective and potent immunostimulants or immunosuppressants is critical. Ginsenosides are a type of steroid saponin derived from ginseng. Most are harmless to the body and even have tonic effects. In this review, we mainly focus on the immunostimulatory and immunosuppressive roles of two types ginsenosides: the protopanaxadiol (PPD)-type and protopanaxatriol (PPT)-type. PPT-type ginsenosides include Rg1, Rg2, Rh4, Re and notoginsenoside R1, and PPD-type ginsenosides include Rg3, Rh2, Rb1, Rb2, Rc, Rd, compound K (CK) and PPD, which activate the immune responses. In addition, Rg1 and Rg6 belong to PPT-type ginsenosides and together with Rg3, Rb1, Rd, CK show immunosuppressive properties. Current explorations of ginsenosides in immunological areas are in the preliminary stages. Therefore, this review may provide some novel ideas to researchers who study the immunoregulatory roles of ginsenosides.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.34 no.6
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• pp.697-704
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• 2001

In this study, we investigated that the survival and growth responses of freshwater cladoceran Moina macrocopa and estuarine cladoceran Diaphanosoma celebensis on the saline culture conditions after transferring for using as live food organism. Estuarine cladoceran D. celebensis was survived and grew on the all salines except to saline jump culture condition of 0 ppt. However, freshwater cladoceran M. mcrocopa was died or decline on the over saline jumping culture conditions of 4 ppt within 5 minutes. These suggest the possibility of using the estuarine cladoceran D. celebensis compare with freshwater cladoceran M. macrocopa as a substitute live food organism for Artemia in the marine larval rearing.

• Proceedings of the Korean Vacuum Society Conference
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• 1995.02a
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• pp.113-113
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• 1995

The adsorpption and decompposition of NO on a stepped ppt(111) surface have been studied using thermal desorpption sppectroscoppy and Auger electron sppectroscoppy. NO adsorbs molecularly in two different states of the terrace and the stepp, which are distinguishable in thermal desorpption sppectra. NO dissociates via a bent sppecies at the stepp sites on the basis of vibrational sppectrum data repported ppreviously. The dissociation of NO is activation pprocess : the activation energy is estimated to be about 2 kcal/mol. Increase in the NO dissociation with adsorpption tempperature is expplained by a pprocess controlled by different of the dissociated atomic nitrogen from the stepp to the terrace of the surface. In addition to No and N2, the desorpption ppeak of N2O is observed. We conclude that the formation of N2O is attributed to surface reaction of No and N adsorbed on the surface.

• 제어로봇시스템학회:학술대회논문집
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• 2005.06a
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• pp.352-355
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• 2005

This paper describes an engineering model development of a pulsed plasma thruster, which is capable of an impulse bit of 20uNs and a specific impulse of 800s. The solid fuel which is Teflon allows for a self-contained, inert and stable propellant system. And, the PPT technology makes it possible to consider a revolutionary attitude control system (ACS) concept providing stabilization and pointing accuracies previously obtainable only with reaction wheels, with reduced mass and power requirements.

• 연구논문집
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• s.30
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• pp.43-56
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• 2000

N-IR spectroscopy technology is very useful. And, the technology has wide application range. In the range, we know that single beam type silica analyzer has some handicap. So we were studied Splitted beam type silica analyzer. This dissertation have been discuss about system structure, system fundamentals and performance test. At the test, we were study in the spectral interference of NH3. We know that existing system had some problem. It is structural frailties of single beam type. Therefore we were study for Splitted beam type structure. And we obtain a good result. We have $\pm$5% accuracy and 0.5 ppb level measuring range. But, we have a question. It is ppt level measuring technology by the laser beam spectroscopy.

• Physical Therapy Korea
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• v.21 no.3
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• pp.28-37
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• 2014

The purpose of this study was to investigate the effects of smartphone use on muscle fatigue and tenderness in the cervical erector spinae (CES) and the upper trapezius (UT) and on the cervical range of motion among subjects with and without neck muscle pain. The subjects were 30 smartphone users in their 20 s who -were assigned to either an experimental group with neck muscle pain or a control group without neck muscle pain. Muscle fatigue and tenderness in the CES and the UT as well as the subjects' cervical range of motion were measured before and after 20-min smartphone sessions in a sitting position. In a between-group comparison of muscle fatigue, the experimental group showed a significantly greater decrease in median frequency in the CES and the right UT after smartphone use (p<.05). Regarding the assessment of muscle tenderness after smartphone use, the experimental group showed a statistically significant decrease in the pressure-pain threshold (PPT) in all muscles (p<.05), whereas the control group showed a significantly decreased PPT in the right CES and the UT (p<.05). The assessment of the cervical range of motion revealed a statistically significant reduction in the cervical flexion-extension and left lateral flexion in the experimental group (p<.05) after smartphone use. However, there was no significant change in the cervical range of motion in the control group (p>.05) after smartphone use. When compared with the control group, the experimental group demonstrated greater changes in cervical extension, lateral flexion, and rotation, except for cervical flexion (p<.05). In conclusion, when smartphone users have pre-existing neck muscle pain, the use of a smartphone further increased muscle fatigue and tenderness in the neck and reduced PPT and the cervical range of motion.

• Annual Conference of KIPS
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• 2017.11a
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• pp.997-1000
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• 2017

가상현실이 심리학에 확대 적용되며 주목할 만한 많은 연구결과들이 발표되고 있다. 이와 더불어 현대사회에서 필수적으로 갖춰야할 능력 중 하나는 바로 발표능력이다. 하지만 제대로 연습을 할 수 있는 조건을 갖추기가 힘들고, 발표 연습 현장은 실제 발표 상황과 많이 다르기 때문에 크게 도움이 되지 않을 수도 있다. 따라서 본 논문에서는 좀 더 현실감 있고, 실제 상황을 반영할 수 있는 발표연습 프로그램을 제안한다. 제안 시스템은 VR기기를 통해 사용자가 실제로 발표하는 느낌을 받도록 환경을 제공하며, 라이프 풍선요소를 배치하여, 사용자의 시선처리 능력을 향상시킬 수 있도록 이끌어 주며, 직접 PPT자료를 업로드 함으로써, 제한적인 공간에서도 PPT이용 발표를 할 수 있도록 도와준다. 마지막으로 본 제안 시스템에서는 사용자 음성 피치와 채점, 침묵시간의 분석을 통해 발표 흐름을 피드백할 수 있는 기능을 제공하였다.