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실내 위치 측위를 통한 D2D 통신 성공 확률 (Opportunity Probability) 측정 및 예측
한규원(Kyuwon Han),남혜린(Hyelin Nam),박지훈(Jihoon Park),성명훈(Meonghoon Seong),김성륜(Seong-Lyun Kim) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
본 논문에서는 실내 측위를 진행하고, 그 결과를 바탕으로 D2D 통신 성공 확률인 Opportunity probability (OP)를 예측 및 측정하여 그 값을 비교하는 실험을 소개한다. 실내 측위를 위해서 스마트폰의 관성 측위 센서와 이를 보정하기 위한 딥러닝 네트워크, 그리고 WiFi RTT를 융합한 측위 기법이 사용되었다. 그 결과 OP값을 중위값 90% 이상으로 예측하는 데 성공하였다.
생체용 Ti-18Nb-6Zr-XO (X = 0~1.5at%) 합금의 형상기억특성에 미치는 산소 농도의 영향
박영철,옥지면,오정화,박수호,이준희,김재일,Park, Young-Chul,Ock, Ji-Myeon,Oh, Jeong-Hwa,Park, Su-Ho,Lee, Jun-Hee,Kim, Jae-Il 한국재료학회 2011 한국재료학회지 Vol.21 No.11
The effect of oxygen on the shape memory characteristics in Ti-18Nb-6Zr-XO (X = 0-1.5 at%) biomedical alloys was investigated by tensile tests. The alloys were fabricated by an arc melting method at Ar atmosphere. The ingots were cold-rolled to 0.45 mm with a reduction up to 95% in thickness. After severe cold-rolling, the plate was solution-treated at 1173 K for 1.8 ks. The fracture stress of the solution-treated specimens increased from 450 Mpa to 880 MPa with an increasing oxygen content up to 1.5%. The fracture stress increased by 287MPa with 1 at% increase of oxygen content. The critical stress for slip increased from 430 MPa to 695 MPa with an increasing oxygen content up to 1.5 at%. The maximum recovery strain of 4.1% was obtained in the Ti-18Nb-6Zr-0.5O (at%) alloy. The martensitic transformation temperature decreased by 140 K with a 1.0 at% increase in O content, which is lower than that of Ti-22Nb-(0-2.0)O (at%) by 20 K. This may have been caused by the effect of the addition of Zr. This study confirmed that addition of oxygen to the Ti-Nb-Zr alloy increases the critical stress for slip due to solid solution hardening without being detrimental to the maximum recovery strain.
박영철,김명동,Sung kyun Park,Hyundo Kim,이선동 경희대학교 융합한의과학연구소 2010 Oriental Pharmacy and Experimental Medicine Vol.10 No.3
A concern of safety issue for traditional herbal medicine is the possibility of some herbs containing heavy metals responsible for several cases of metal poisoning. In our previous study,the physiological levels of heavy metals, such as Cd, Cu, Hg and Pb, were examined to evaluate a potential risk in patients taking herbal medicine. In this study, the levels of 12 heavy metals,including non-metallic element, Se, were analyzed in hair and compared to the results from the previous study. In the previous study, the levels of Cd, Cu, Hg and Pb in hair showed a significantly lower odds ratio than 1. In this study, however, all metals did not show any significant odds ratio higher or lower than 1 even if 5 of 12 metals showed lower odds ratio than 1. In addition, the levels of metal concentrations, especially for Cu, Fe, Pb and Zn, exceeding the WHO reference values were observed in hair. However, any evidence for metal accumulation in hair caused by taking herbal medicines for long duration was not observed in analysis of multiple regression and odds ratio from case-control study. This result would show another possibility for a role of herbs as a non-enzymatic chelator inhibiting the gastrointestinal absorption of heavy metals.
박영철,박용기,Park, Young-Chul,Park, Yong-Ki 동국대학교 한의학연구소 2008 東國韓醫學硏究所論文集 Vol.11 No.-
Objectives: The study was designed to evaluate the single dose toxicity of modified Bo-yang-Hwan-o-Tang (mBHT) in Sprague-Dawley (SD) rats. Methods: The mBHT was once administrated orally to both sexes of rats at dose 2,000 mg/kg body weight which are the recommended maximum limit dose for acute toxicity. We recorded clinical signs of toxicity, body weight, gross and histological changes in target organs for all rats. Results: Neither significant changes of body weight not death was observed during the observation period in mBHT-administrated rats. Neither significant toxic signs not histopathological changes were shown during the observation period. There were not observed significant gross abnormality between the control and mBHT-administrated rats. Conclusions: These results indicated that the toxicity of mBHT is greater than 2,000 mg/kg body weight in SD rats.
숙지황(Rehmannia glutinosa)의 약리작용과 독성
박영철,이기용,백낙민,손혜영,국윤범,이선동,Park, Yeong-Chul,Lee, Gi-Yong,Baek, Lag-Min,Son, Hye-Young,Kook, Yoon-Boom,Lee, Sun-Dong 대한한의학방제학회 2011 大韓韓醫學方劑學會誌 Vol.19 No.1
Objectives : Rehmannia glutinosa has been used extensively in Korean traditional medicine. Although thorough clinical trials are lacking, Various pharmacological actions for Rehmannia glutinosa has been identified newly using animal models. In addition, it was reported that reactive intermediates, potentially causing toxic effects, was isolated from one of components in Rehmannia glutinosa. In this article, it is purposed for explanation and introduction of new studies for Rehmannia glutinosa in terms of pharmacological action and toxicology. Methods : New studies for Rehmannia glutinosa were reviewed and summarized in terms of pharmacological action and toxicity. Results and Conclusions : Rhmannia glutinosa and its components including iridoids, saccharides, as well as amino acid, showed a variety of pharmacological actions on the blood system, immune system, endocrine system, cardiovascular system and the nervous system. In addition, it was identified that aucubin, one of major components of Rhmannia glutinosa was biotransformed to reactive intermediates by ${\beta}$-glycosidase and acid-hydrolysis, resulting in forming aucubigenin- albumin adduct. Even if a lot of new pharmacological actions has been identified, it should be considered for Rhmannia glutinosa to contain the material producing reactive intermediates which may induce the side effects.
박영철,이창식,Park, Young-Cheol,Lee, Chang-Sik 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.7
The exhaust gas flow in the inlet collector of close coupled catalyst(CCC) adapted to the exhaust manifold is very complex flow because the exhaust gas is a pulsation flow with several port flow. The distribution of gas flow and temperature in inlet collector effect to the efficiency of catalytic converter. In this study, it measures temperatures on several point in inlet collector with two kind of inlet collector volume. And it analyzes with CFD to exhaust manifold and close coupled catalyst for temperature and flow. Comparing to measured and analyzed result, it find increasing of collector volume effects to catalyst temperature distribution and uniformity of catalytic converter
배양망막색소상피세포에서 젤라틴아제의 발현에 대한 산화스트레스의 영향
박영철,최광주,Young-Chul Park,Gwang-Ju Choi 대한안과학회 2005 대한안과학회지 Vol.46 No.11
Purpose: To evaluate the expression pattern of gelatinases in the human retinal pigment epithelial cell line ARPE-19 in response to oxidative stress. Methods: ARPE-19 cells were exposed to paraquat for 72 hours. The cells were assayed for the mRNA expression of gelatinase A and gelatinase B by reverse transcriptase polymerase chain reaction (RT-PCR). The conditioned media were assayed for the production of gelatinases protein by Western blotting. Also, the inhibitory effect of the antioxidants against oxidative stress to the cells was evaluated. Results: The gelatinase levels in the RPE cells increased under oxidative stress compaired with the control (p〈 0.05). Also, the levels decreased when the cells were incubated with the antioxidant N-acetylcysteine (NAC). Conclusions: Oxidative stress upregulates gelatinase expression in ARPE-19 cells.
서양의학 독성학의 기본적 개념 및 한약의 $LD_{50}$
박영철,이선동,박경식,Park Yeon-Chul,Lee Sun-Dong,Park Kyoung-Sik 대한예방한의학회 1999 대한예방한의학회지 Vol.3 No.2
Today, toxicology is used for many purpose, in many fields. Classification of special toxic effect is related next 4 important principles. 1. The chemical substance must move to target organ or tissue that can induce Biological effect. For this movement, we have to understand the physical-chemical characteristic of substance, and the rout of absorption, metabolism, diffusion and excretion of toxic substance. 2. Every biological effect that induced by chemical substance is not harmful. For example, some specific chemical substance is not harmful in liver enzyme system. 3. The strength of biological effect induced by chemical substance is deep related with dose. Nearly all substance is not effective below the specific dose, and it may toxic to death over the specific dose. It is the 'Dose - response relationship' But carcinogen may toxic whether it is law dose or not. 4. The information that was obtained by experimental animal test, could have to adapt in human biology. Because biological effect of chemical substance could be different in every biological species. In past, drugs was obtained by animal or plants. But in the future, it could be obtained by biochemistry, and genome project. Therefore, in Oriental medicine, research and approach is needed at this time, and have to develop new method of experience in toxic method.
엽산 투여에 의한 니코틴-유도 혈장 homocysteine 농도에 대한 영향과 금단증상 완화를 위한 한의학적 처방에 대한 고찰
박영철,신헌태,박해모,이선동,Park, Yeong-Chul,Shin, Heon-Tae,Park, Hae-Mo,Lee, Sun-Dong 대한예방한의학회 2007 대한예방한의학회지 Vol.11 No.1
Homocysteine is a sulfur amino-acid produced during the metabolism of the essential amino acid methionine. Moderately increased plasma total homocysteine concentration have been implicated as a risk factor for occlusive vascular disease. Smoking is known to be one of the most significant factors leading to elevated plasma homocysteine concentration. However, the main component of a cigarette, nicotine has been not studied whether it is linked directly to the increase of homocysteine concentration in blood. The metabolism of homocysteine is closely linked to that of its cofactors, folate. Here, the effects of nicotine and folic acid on amount of plasma homocysteine were studied. The concentration of homocysteine was increased by about 70% in rat plasma after nicotine treatment for one month. This increased concentration of homocysteine was reduced by about 60% at 6 hours later after folate treatment. Thus, nicotine should be directly involved in increasing the concentration of plasma homocysteine. Also it is suggested that these results can be and applied and used for controlling withdrawal symptoms after stopping smoking as one of oriental medicine formulas.
적외선 체열 촬영을 이용한 중풍(中風) 편마비(片痲痺) 환자(患者)의 합곡혈(合谷穴) 일반 자침시(刺針時)와 심자시(深刺時) 피부온도변화(皮膚溫度變化) 관찰(觀察)
박영철,채진석,엄재용,송성세,최익선,Park, Young-chul,Chae, Jin-seok,Eom, Jae-yong,Son, Sung-se,Choe, Ick-seon 대한침구의학회 2003 대한침구의학회지 Vol.20 No.4
Objective : This study designed to find out the effects of deep acupuncture in cerebrovascular hemiplegia. Methods : This study was performed on 30 patients with cerebrovascular hemiplegia to observe difference in temperature of skin surface between general acupuncture and deep acupuncture at Hapkok using digital infrared thermographic imaging(D.I.T.I.) Results : 1. Temperature of paralytic side is sigficantly higer $0.39{\pm}0.78^{\circ}C$ than that of contralateral side. 2. Thermal difference(${\Delta}T$) of paralytic side-contralateral side decreased $0.08{\pm}0.53^{\circ}C$ after general acupuncture, but there is no significant. $0.20{\pm}0.50^{\circ}C$ after deep acupuncture decreased significantly. So deep acupuncture is more effective than general acupuncture. 3. Thermal difference of paralytic side-paralytic side and contralateral side-contralateral side decreased significantly after acupuncture, and thermal difference of deep acupuncture on paralytic side-paralytic side decreased $0.42{\pm}1.07^{\circ}C$ more than that of general acupuncture. So deep acupuncture is more effective than general acupuncture. Conclusions: This study showed that deep acupuncture is more effective than general acupuncture In cerebrovascular hemiplegia, and further study is needed on clinical trials.