대학로 오페라 ‘명성황후 by Verdi 라 트라비아타’ - 세계적 오페라, 한국사를 만나다! : 8월 24일 (목) 오후 7시 30분 대학로 한예극장

박정덕 리음아트앤컴퍼니 2023 월간리뷰 Vol.2023 No.10

Te 蒸着膜의 電氣的 性質

朴鼎悳 건국대학교 1982 學術誌 Vol.26 No.2

In this study the Te thin film is deposited on the microscope slide glass substrate by means of vacuum evaporator. Evaporation is done under the pressure of 2∼5×10-5 Torr. and the samples are heated at various temperature in electric furnace. After measuring the thickness of the film and its electrical conductivity, the dependence of the electrical properties of the film on its thickness and on the heat treatment of the samples are investigated as follows; 1.The sample evaporated in laboratory temperature does not completely crystalized, its electrical properties being very poor. 2.With heat treatment of 200℃, the electrical conductivity of the sample more than 2μ in thickness is constant but less than 2μ increase.

급성 카드뮴중독에 의한 랏트의 간, 신 및 고환조직의 손상에 미치는 Diethyldithiocarbamate의 방어효과

박정덕,정규철 중앙대학교 의과대학 의과학연구소 1989 中央醫大誌 Vol.14 No.2

To investigate the effects of diethyldithiocarbamate (DDTC) on acute toxicity in cadmium in toxicated rat, single doses of 5 mg/kg CdCl_2 were given to Sprague-Dawley male rats by intraperitoneal injection in Cd-treated group, 500 mg/kg DDTC IP injection 60 min after Cd treatment in DDTC-treated group, and saline treatment only in control group. Rats of each group were sacrificed by decapitation 48 hours after the injection. Average cadmium concentrations in liver, kidney and testis for control group were 0.027 ± 0.008㎍/g wet wt, 0.032 ± 0.006 ㎍/g wet wt and 0.004 ± 0,002 ㎍/g wet wt, and those for Cd-treated group were 8.748 ± 0.985 ㎍/g wet wt, 15.947 ± 3.723 ㎍/g wet wt and 0.617 ± 0.140 ㎍/g wet wt, respectively. In DDTC-treated group, hepatic, renal and testicular Cd concentrations were 6.209 ± 0.691㎍/g wet wt, 13.736 ± 1.692 ㎍/g wet wt and 1.438 ± 0.330㎍/g wet wt, respectively. DDTC caused the shift of Cd from liver and kidney to testis. The production of superoxide radicals was increased in liver and kidney of Cd-treated group, whereas catalase activities were reduced. The protein contents in tissue homogenates, cytosolic and mitochondrial fractions, and activities of Cu, Zn-SOD, Mn-SOD and ATPase were not significantly altered by the Cd treatment. In testis of Cd-treated group, although the production of superoxide radical was undetected, the catalase activity and specific activity of'Cu,Zn-SOD were increased, and protein contents of above fractions and activities of Mn-SOD and ATPase were reduced compared to control group. This implies that mechanism of cadmium toxicity to liver and kidney differs from that to testis, suggesting a possible role of oxygen radical induced by cadmium in injury to testis but not to liver and kidney. Since the pattern of change in protein contents, production of superoxide radical, activities of catalase, Cu, Zn-SOD, Mn-SOD and ATPase in the DDTC-treated group were similar to those in the control group, DDTC was considered to be effective in protecting the tissue damage caused by cadmium toxicity. Histopathological findings showing that the tissue destruction of testis was more extensive and severer than those of liver and kidney in Cd-treated group, suggest that testis is more susceptible to cadmium toxicity than liver and kidney. No significant change from control was noted in liver, kidney and testis in DDTC-treated group, indicating the protective effect of DDTC on tissue damages induced by cadmium.

Se1-xTex 薄膜의 光電導特性

朴鼎德 建國大學校基礎科學硏究所 1985 理學論集 Vol.10 No.-

This study are investigated the photoconductive properties of the ?? thin film which was deposited by means of vacuum evaporator. The ?? thin film samples are prepared on the slide glass substrate at laboratory temperature with mixture in various mol ratio x equal to 2%, 4%, 6%, 8% and 10% of Te to Se. According to the experiments are obtained the results as follow. 1. The resistivity of the ?? thin film is measured about 1KΩ-cm at laboratoly temperature. 2. The photocurrent is measured about 2㎂ at 1,000 Lux illumination in the laboratory temperature. 3. The spectral photosensitivity of the ?? thin film are investigated in wave length from 300 to 700nm range and its maximum photosensitivity is found at about 500nm.

金屬 薄膜의 電氣 抵抗과 光 透過率 測定

朴鼎悳,魏明鏞 건국대학교 1972 學術誌 Vol.13 No.1

This is a study on investigation to physical properties of resistivity and transmittance for the Au, Ag and Al metal thin film. This sample's purity is 99.9%. Evaporation was done under the pressure 10 Torr. and microscope slide glass was used as substrate. The thickness was measured by Multiple-Beam Interferometry method, resistivity was measured by using Leeds & Northrup Wheatstone bridge and transmittance was measured by the Multiplier Photometer. The following results were obtained through the experiment : 1) Thickness of thin film was increased according to the evaporation time, but its relation was not linear. 2) Relationship between the thickness and the resistivity well agreed with Funcks-Sondheimer theory, and metal thin film of thickness greater than 1000 Å approximately behaved like bulk metal. 3) Transmittance of metal thin film in visible light was generally observed that was zero at thickness Al 400Å, Ag 500Å and Au 600Å.

Mo-99의 감마崩壞에 관한 硏究

朴鼎悳 建國大學校基礎科學硏究所 1988 理學論集 Vol.13 No.-

韓國에너지硏究所 同位元素室에서 製造하여 使用者에게 공급하는 Molybdenum 의 放射性 同位元素인 ??에 대하여 放出하는 감마 放射線을 檢出하고 그 에너지를 測定하여 崩壞形態를 調査하였다. 實驗은 미국 Tracor Northern 社製 model No. TN-1750, 1024 Multichannel γ-Ray Spectrometer System을 利用하여 標準 γ放射能 試料 ??의 γ-ray spectrum을 測定하여 에너지 511keV와 1275keV에 해당하는 Photopeak의 channel number 140및 314를 택하여 tow point method로 channel number대 energy의 補正式을 作成하고 이것에 의거하여 同一한 條件으로 測定한 實驗試料 ??의 γ-ray spectrum을 얻어 放出하는 γ線의 에너지를 구하였다. 이것을 標準値와 比較檢討한 結果 그 誤差가 2keV以下로 대단히 적은 優秀한 製品임이 確認되었다. In this study, the decay form of ?? which is supplied by Korea Advanced Energy Research Institude(KAERI) had been investigated from the analysis of γ-ray energy spectrum radiating from the radioactive element ??. The γ-ray energy spectrum was obtained using Nal(T1) scintillation detector and multichannel pulse height analyser. The calibration curve and formula for γ-ray energy versus channel number were made from the two photopeaks of standard radioactive source ??, 140 and 314 channel corresponding to the γ-ray energy of 511keV and 1275keV, respectively. The γ-ray energies from ?? were detected at the same condition with the standard source, and compared with standard energies of ??. Experimental results show that the γ-ray energies from the sample are in good agreement with the values of standard source within energy error of 2 keV, which means that the Mo supplied by the KAERI can be used as a standard radioactive source.

Pb(Zr_(1-x)Ti_x)O₃ Ceramics의 誘電特性에 관한 硏究

朴鼎悳 건국대학교 1991 學術誌 Vol.35 No.2

Pb(Zr1-xTix) O3 ceramics are made in term of mixing to be 1 : (1-x) : x. The chemical mole fractions of PbO2, ZrO2 and TiO2 is ranged over x=0, 0.1, 0.2‥‥‥, 0.9.1.0 by the additional mole fraction 0.1. The dielectric constant of Pb(Zr1-xTix) O3 ceramics have been measured over the temperature range from 20℃ to 600℃. As a result were obtained the roost value of dielectric constant k=6108 and curie point Tc=360℃ in sintering temperature 1100℃ and r=0.5 of Pb (Zr0.5Ti0.5) O3 ceramics.

Single Channel Pulse Hight Analyzer에 의한 Gamma Ray Energy 測定에 관한 硏究

朴鼎悳 건국대학교 1969 學術誌 Vol.10 No.1

Measurment of Gamma ray energy is made possible by analyze of secondary electrons to be produced when gamma ray passes through material and is obtained by observation of pulse distribution which is proportional to energy loss of gamma photon that incdents to Scintillation crystal. Gamma ray spectrometer used in this measurement is RLP-5 Continuous Scanning Spectrometer System made in TRACERLAB Inc. which shows in 《Fig.1》 block-diagram. Gamma ray energy is measured with determination of pulse height which through threshold setting of photopeak location on the radiation spectrum Relations between pulse height and energy was obtained by the above measurement method for standard gamma source Cs-137 made in TRACERLAB Inc. The result is as 《table 1》 and 《Fig.7》 In this study gamma ray energy was measured on three samples of Co-60, Na-22 and Mn-54 by identical measurement condition. The result is as table 2 and 《Fig.8》

Human Exposure and Health Effects of Inorganic and Elemental Mercury

박정덕,Wei Zheng 대한예방의학회 2012 예방의학회지 Vol.45 No.6

Mercury is a toxic and non-essential metal in the human body. Mercury is ubiquitously distributed in the environment, present in natural products, and exists extensively in items encountered in daily life. There are three forms of mercury, i.e., elemental (or metallic) mercury, inorganic mercury compounds, and organic mercury compounds. This review examines the toxicity of elemental mercury and inorganic mercury compounds. Inorganic mercury compounds are water soluble with a bioavailability of 7% to 15% after ingestion; they are also irritants and cause gastrointestinal symptoms. Upon entering the body, inorganic mercury compounds are accumulated mainly in the kidneys and produce kidney damage. In contrast, human exposure to elemental mercury is mainly by inhalation, followed by rapid absorption and distribution in all major organs. Elemental mercury from ingestion is poorly absorbed with a bioavailability of less than 0.01%. The primary target organs of elemental mercury are the brain and kidney. Elemental mercury is lipid soluble and can cross the blood-brain barrier, while inorganic mercury compounds are not lipid soluble, rendering them unable to cross the blood-brain barrier. Elemental mercury may also enter the brain from the nasal cavity through the olfactory pathway. The blood mercury is a useful biomarker after short-term and high-level exposure, whereas the urine mercury is the ideal biomarker for long-term exposure to both elemental and inorganic mercury, and also as a good indicator of body burden. This review discusses the common sources of mercury exposure, skin lightening products containing mercury and mercury release from dental amalgam filling, two issues that happen in daily life, bear significant public health importance, and yet undergo extensive debate on their safety.

폐광지성(廢鑛地城) 주민(住民)의 요중(尿中) 카드뮴 농도(濃度)와 현기능평가(賢機能評價)

박정덕,박찬병,최병선,강은용,홍연표,장임원,천병렬,예민해,Park, Jung-Duck,Park, Chan-Byung,Choi, Byung-Sun,Kang, Eun-Yong,Hong, Yeon-Pyo,Chang, Im-Won,Chun, Byung-Yeol,Yeh, Min-Hae 대한예방의학회 1998 예방의학회지 Vol.31 No.3

1995년 8월부터 12월 사이에 미량의 카드뮴에 오염된 것으로 밝혀진 폐광 인근 지역에 거주하고 있는 지역주민 184명(남자: 82명, 여자: 102명)을 대상으로 카드뮴에 의한 만성적인 폭로와 신기능장애를 평가하기 위하여 요중 카드뮴과 NAG활성도, $\beta_2MG$배설량 및 총단백질량을 정량하여 비교 분석하였다. 이때 특별히 카드뮴에 폭로된 적이 없는 일반주민 160명(남자 : 64명, 여자 : 96명)을 대조군으로 선정하였다. 남자의 경우 폭로군의 요중 평균 카드뮴농도는 $2.56{\mu}g/\ell,\;2.80{\mu}g/g$ creatinine 및 $2.50{\mu}g/S.G.$, 대조군은 $1.19{\mu}g/\ell,\;1.36{\mu}g/g$ creatinine 및 $1.17{\mu}g/S.G.$ 였고, 여자에서는 폭로군 $2.69{\mu}g/\ell,\;3.94{\mu}g/g$ creatinine 및 $2.63{\mu}g/S.G.$, 대조군 $1.27{\mu}g/\ell,\;1.97{\mu}g/g$ creatinine 및 $1.25{\mu}g/S.G.$로서 폭로군이 대조군에 비해 남 여 모두에서 유의하게 높았다. 연령에 따른 요중 평균 카드뮴 농도는 남자의 경우 $20\sim39$세군에서는 폭로군과 대조군간에 차이가 없었으나, $40\sim59$세군과 60세 이상군에서는 폭로군이 유의하게 높았다. 여자에서는 폭로군이 대조군에 비해 모든 연령층에서 유의하게 높았다. 또한, 폭로군에 있어서 조사대상 지역에 거주한 기간이 길수록 그리고 이 지역에서 생산된 쌀과 채소류를 섭취하는 사람들의 요중 카드뮴 농도가 높게 나타나, 폐광 인근 지역주민들이 미량이지만 상대적으로 많은 양의 카드뮴에 만성적으로 폭로되고 있는 것으로 추정되었다. 폭로군과 대조군의 요중 평균 NAG활성도, $\beta_2-MG$ 배설량 및 총단백질량은 두 군간에 유의한 차이가 없었다. 그러나, 폭로군에서 요중 NAG활성도와 총단백질량은 요중 카드뮴량과 통계적으로 유의한 정상관이 있었으나 $\beta_2-MG$ 배설량은 유의하지 않았다. 또한 2.0 미만군, 2.0이상 10.0미만군, 10.0이상군으로 구분한 요중 카드뮴 농도수준에 따른 분석시 요중 카드뮴 2.0미만군에 비해 10.0이상군의 NAG활성도, $\beta_2-MG$배설량 및 총단백량이 유의하게 증가되었으며, NAG활성도는 2.0이상 10.0미만군에서도 유의하게 증가되었다. 즉, 폭로군에서 요중 카드뮴 농도에 따른 요중 NAG활성도의 증가가 $\beta_2-MG$배설량의 증가에 비해 상대적으로 민감하게 나타나, 향후 카드뮴 폭로군에 대한 색출검사시 $\beta_2-MG$배설량과 함께 NAG활성도를 조사함으로써 조기진단적 가치가 높을 것으로 사료된다. Urinary cadmium is used as a sensitive indicator for internal Cd dose, and increased excretion of $N-acetyl-\beta-D-glucosaminidase(NAG)$, $\beta_2-microglobulin(MG)$ and total protein are useful indices for renal dysfunction by chronic exposure to Cd. The target group was 184 inhabitant(82 men and 102 women) in an abandoned mine area known as exposure to low level Cd. The control group was took 160 individuals(64 men and 96 women) in Cd not-exposed area. Urinary Cd concentration was significantly higher in the target group than the control. The geometric mean of urinary Cd for male was $2.56{\mu}g/\ell,\;2.80{\mu}g/g$ creatinine and $2.50{\mu}g/S.G.$ in the target group and $1.19{\mu}g/\ell,\;1.36{\mu}g/g$ creatinine and $1.17{\mu}g/S.G.$ in the control. For female $2.69{\mu}g/\ell,\;3.94{\mu}g/g$ creatinine and $2.63{\mu}g/S.G.$ in the target group and $1.27{\mu}g/\ell,\;1.97{\mu}g/g$ creatinine and $1.25{\mu}g/S.G.$ in the control, respectively. In addition, urinary Cd of the target group had affected by the period of residence and dietary habit for the rice and the vegetables from the target area. These findings suggest the chronic exposure to Cd of the target population. Mean excretion of urinary NAG, $\beta_2-MG$ and total protein were not significant between two groups. In the target group, urinary NAG activity and total protein were significantly correlated with urinary Cd, but $\beta_2-MG$ was not related. Urinary excretion of NAG, $\beta_2-MG$ and total protein were significantly increased in $10\leqq$ than in <2 of urinary Cd level. In $2\sim10$ group of urinary Cd level, the excretion of NAG significantly increased while not showed for $\beta_2-MG$. In present study, urinary excretion of NAG was relatively sensitive than $\beta_2-MG$ in chronic exposure population to low level Cd.