• Journal of Haehwa Medicine
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• v.21 no.2
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• pp.95-104
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• 2013

스트레스로 인한 인체의 반응은 중추신경계, 시상하부, 변연계 및 기타 표적기관으로부터 시작되는데, 자율신경계 반응, 내분비계 반응, 면역계 반응 등을 통하여 복합적인 신체 증상으로 발현되며, 스트레스 상황에서는 시상하부-뇌하수체-부신 축 (HPA axis)과 교감신경계의 작용으로 여러 신경전달물질 방출에 변화가 생기며 이러한 변화는 면역기전에 중요한 역할을 하고 일부는 면역세포의 활성에 직접적으로 영향을 미쳐 신체 각종 질병의 원인이 될 것으로 추정된다. 한의학에서는 천인상응(天人相應)의 관점에서 육기(六氣)를 생체자극의 외적 요인으로 간주하고, 생체내적 현상인 정신이 외적 자극을 통하여 나타나는 생체반응을 칠정(七情)으로 보았으며, 이러한 관점에서 스트레스는 신체에 오장(五臟)의 허실(虛實), 혈허(血虛), 정손(精損), 기역(氣逆), 기(氣)의 순환장애, 담연(痰涎), 화(火) 등의 병적인 요인을 만들어 준다. 본 연구에서 재료로 사용된 호초 (Piper nigrum Linne)는 후추나무의 과실을 말린 것으로서 세계적으로 널리 사용되는 향신료이며, 한의학에서는 온중제한하기(溫中除寒下氣), 쾌격소담(快膈消痰), 해독(解毒)등의 효능으로 한담식적(寒痰食積) 완복냉통(脘腹冷通) 곽란(癨亂) 토사(吐瀉)등의 치료에 활용되어 왔다. 특히 쾌격소담(快膈消痰)하는 작용은 정신적 스트레스에 유효할 것으로 생각되므로 본 연구에 이용하게 되었다. 실험동물은 ICR계 생쥐를 이용하였으며, 심리적 스트레스는 옆쪽 cage에서 다른 마우스의 신체에 가해지는 전기 충격을 하루 1시간 동안 지켜보게 하는 것으로 유발하였으며, 이 상태에서 약물을 투여한 그룹을 실험군, 그렇지 않은 그룹을 대조군으로 하였다. 정상군은 아무런 자극 없이 하루 1시간 동안 일정 공간에 가두어 두는 것으로 하였다. 실험 결과, 호초(胡椒) 추출물을 100mg/kg/day 용량으로 5일간 투여한 실험군은 아무런 처치를 하지 않은 대조군에 비해 혈장 중 corticosterone 함량이 유의하게 감소되었고, 뇌에서의 noradrenalin 분비량이 유의하게 증가되었으며, plus maze test에서의 머무름 시간이 연장되는 것으로 나타나 호초(胡椒)가 심리적 스트레스를 효과적으로 억제하고 진정작용이 있는 것으로 사료되나 구체적인 작용기전 및 인체에서의 효과에 대해서는 향후의 보다 자세한 연구가 필요할 것으로 생각된다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.6
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• pp.521-526
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• 2016

This paper suggests a new design that makes use of rotary inertia that can allow autonomous movement of an autonomous colonoscope robot in the colon of a patient as a locomotive mechanism. As commercial colonoscopy causes a lengthy time of pain and discomfort to the patients when colonoscopy patients are reluctant to receive surgery, there is a tendency to avoid the test in the early diagnosis of colorectal cancer. To solve this problem, research has been conducted on the next generation of robotic colonoscopes that can reduce the discomfort and pain by moving autonomously within the colon of the patients. In the driving mechanism utilizing the rotational inertia, a flywheel is driven by a motor to store energy and produce rotational inertia. By the energy stored and released by the flywheel, the stick phenomenon that occurs when the robot is running in the intestine can be overcome effectively. To do this, a controller that can control the velocity of the flywheel and is robust to high frequency noise was designed and implemented. The driving mechanism using the rotational inertia presented here showed that the structure is also effective and the experiment can be run easily compared to another mechanism.

• Journal of Radiation Protection and Research
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• v.28 no.3
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• pp.173-182
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• 2003

A prototype liquid scillatillator system for measurement of multiple beta-labeled mixtures was developed and its characteristic was investigated. The signal processing system consists of two photomultiplier tubes and the coincident count circuit. The characteristic of the system was analyzed using 4 beta-labeled samples $(^3H,\;^{14}C,\;^{36}Cl\;and\;^{90}Sr)$. Beta spectra from the samples were obtained without radiation shielding, and the detection limits for each nuclides were estimated based on the spectra. The estimated detection limits were compared to the legal regulation values. It is found that the liquid radioactive nuclides are detectable well below the legal regulation values.

• Journal of Hydrogen and New Energy
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• v.28 no.2
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• pp.137-143
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• 2017

In the present study, Ni and $TaF_5$ were chosen as additives to enhance the hydriding and dehydriding rates of Mg. A sample with a composition of 80 wt% Mg + 14 wt% Ni + 6 wt% $TaF_5$ (named $80Mg+14Ni+6TaF_5$) was prepared by high-energy ball milling in hydrogen. Its hydriding and dehydriding properties were then examined. At the fourth cycle, the activated sample absorbed 3.88 wt% H for 2.5 min, 4.74 wt% H for 5 min, and 5.75 wt% H for 60 min at 593 K under 12 bar $H_2$. $80Mg+14Ni+6TaF_5$ had an effective hydrogen-storage capacity (the quantity of hydrogen absorbed for 60 min) of about 5.8 wt%. The sample desorbed 1.42 wt% H for 5 min, 3.42 wt% H for 15 min, and 5.09 wt% H for 60 min at 593 K under 1.0 bar $H_2$. Line scanning results by EDS for $80Mg+14Ni+6TaF_5$ before and after cycling showed that the peaks of Ta and F appeared at different positions, indicating that the $TaF_5$ in $80Mg+14Ni+6TaF_5$ was decomposed.

• Analytical Science and Technology
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• v.25 no.6
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• pp.402-409
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• 2012

Quantitative analytical condition for arsenic in plastic materials by the flow injection-hydride generation-inductively coupled plasma-atomic emission spectrometry was studied. The plastic samples were dissolved by wet-acid digestion method and microwave-acid digestion method. The reproducibility and accuracy in this method was verified using of certified reference materials(CRMs) CRM-EC680k and CRM-EC681k. The analyical results agrees with certified value within the range of uncertainty. The results of CRM-EC680k wer 4.1~4.3 mg/kg (certified value $4.1{\pm}0.5$ mg/kg), and the results of CRM-EC681k were 28.9~30.6 mg/kg (certified value $29.1{\pm}1.8$ mg/kg).

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.46 no.6
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• pp.519-526
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• 2018

In order to analyze space resources, it had to be brought to earth. However, using laser-induced breakdown spectroscopy(LIBS) and Raman spectroscopy, it is possible to analyze qualitative and quantitative analysis of space minerals in real time. LIBS is a spectroscopic method in which a high energy laser is concentrated on a material surface to generate a plasma, and the emitted light is acquired through a spectroscope to analyze the atomic composition. Raman spectroscopy is a spectroscopic method that analyzes the molecular structure by measuring scattered light. These two spectroscopic methods are complementary spectroscopic methods for analyzing the atoms and molecules of unknown minerals and have an advantage as space payloads. In this study, data were analyzed qualitatively by using principal component analysis(PCA). In addition, a mixture of two minerals was prepared and a quantitative analysis was performed to predict the concentration of the material.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.39 no.6
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• pp.485-496
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• 2015

The present study presents experimental results on the characteristics of emission spectra of kerosene/air swirl flames. The aviation fuel Jet A-1, which is used for the liquid rocket engines of the Korea Space Launch Vehicle, is used with three different swirlers to investigate the swirl strength effects. The emission spectra from the flames are measured with a spectrometer as the swirl strength and combustion air temperature are varied. Chemiluminescence intensities of $OH^*$, $CH^*$ and $C_2{^*}$ are identified from the spectra. The chemiluminescence intensities from the kerosene flames show sensitivity to the swirl strength and are affected by changes in the combustion air temperature. Among the three radicals of interest, $C_2{^*}$ show the most significant changes in chemiluminescence intensity with the swirl strength and equivalence ratio. The intensity ratios $I_{OH^*}/I_{CH^*}$ and $I_{C_2{^*}}/I_{CH^*}$ are adequate for indicating changes in the equivalence ratio with the air and fuel mass flow rates, respectively.

• Journal of Chest Surgery
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• v.42 no.2
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• pp.268-271
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• 2009

Solitary plasmacytoma of bone is a rare disease that accounts for only about $3{\sim}5%$ of all plasma cell tumors. Especially, no case of solitary plasmacytoma of a rib origin has been described in the Korean literature. A 54 year old Korean man was referred to our hospital for further evaluation of a lung mass that had been detected on a screening chest radiograph. A tumor with a left 6th rib origin was revealed by the computed tomography(CT) and positive emission tomography (PET-CT); therefore, surgical resection was performed. The histopathological findings of the tumor revealed plasmacytoma of a rib origin. The postoperative screening test revealed no evidence of multiple myeloma. Postoperative radiation therapy was not performed, and no new lesion has been noted during the 2 years of follow up.

• Analytical Science and Technology
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• v.5 no.1
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• pp.135-142
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• 1992

Indium tin oxide(ITO) films coated on the window glass selectively transmit the solar energy and infrared. We call this system passive solar collectors. Selectively absorbing properties of sol gel dip coated ITO films were characterized by UV-VIS-NIR spectroscopy. The effects of heat treating temperature, time, atmosphere, substrate and barrier layers are concerned. Indium tin oxide films heat-treated at $500^{\circ}C$ in a reducing atmosphere show intrinsic properties. Efficiency of solar energy transmittance was enhanced by coating of $SiO_2-ZrO_2$ as an alkali ion barrier layer. Energy was saved by the double layers of $SiO_2-ZrO_2$ and ITO since solar energy is transmitted and heat generated inside(${\lambda}$ > 2700nm) is reflected.

• Journal of the Korea Furniture Society
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• v.27 no.4
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• pp.335-342
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• 2016

In previous study, volatile organic compounds (VOCs) emission characteristics were highly affected by coating materials for wood finishing. Natural based coating materials showed that about 15~46% lower TVOC emission than typical products. In this study, long-term changes of VOCs emission characteristics from pine panel with three types of coating treatments were determined. Non-treated pine panel emitted $604.7{\mu}g/m^2{\cdot}h$ of TVOC that contained 66% of NVOC ($399.7{\mu}g/m^2{\cdot}h$) at 0 month. After 10 month, TVOC reduced 88% and 93% reduction on NVOC was observed. Natural oil and waterborne stain treated pine panel showed 61% and 77% lower TVOC, respectively, than non-treated pine panel. However, TVOC from finished pine panels showed higher TVOC emission than non-treated pine panel. All samples satisfied the VOC emission regulation (below $4,000{\mu}g/m^2{\cdot}h$) by Korean Ministry of Environment. Toluene emission regulation (below $80{\mu}g/m^2{\cdot}h$) was passed on all sample without varnish treated pine panel at 0 month. According to HB qualification standard for construction materials by Korea Air Cleaning Association (KACA), wood is not qualified to get the best tag due to high TVOC emission. At the 10 months, only non-treated pine panel could get the best tag of HB from KACA.