토양오염

朴正德 대한의사협회 1998 대한의사협회지 Vol.41 No.10

[BaTiO_3]_(1-x) [Cd_5(PO_4)_3Cl]_x의 誘電特性

朴鼎悳 건국대학교 교육대학원 1987 敎育論叢 Vol.7 No.-

The dielectric constant of 「BaTiO_3」_(1-x)「Cd_5(Po_4)_3 Cl」_x has been measured over the temperature range of 20 to 300℃. The additional mole fraction of the Cd_5(Po_4)_3 Cl is ranged over 0.1 to 0.9. The dielectric constant exhibits an anomalous decrease near the tetragonal to cubic transition about 120℃.

放射線의 障害와 許容量

朴鼎悳 공군본부 의무감실 1958 항공의학 Vol.6 No.1

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.

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.

放射能絶對値測定에 있어서의 計數値補正法에 對하여

朴鼎悳 건국대학교 1969 理工學報 Vol.1969 No.2

食品中에 含有된 放射能 濃度 測定에 關한 硏究 : 1970년도 生産된 農作物에 對하여 Radioactivity in Agricultural Crops Produced 1970

朴鼎悳 건국대학교 1971 學術誌 Vol.12 No.1

The animal and plant on the earth are, directly and indirectly, contaminated by natural and artificial radioactivity. Especially to human, as they are worried to be in damage by radioactivity in their adoption contaminated foods by these radioactivity. The writer has selected about 30 kinds of the agricultural products of 1970 that are to be taken us as daily principal foods, and surveyed the concentration of gross Beta radiation by Geiger Mucller Counter. In the result of the research mentioned above, generaly there contained radio-activity more in beans and vegetables comparing with other crops and it is an careful fact that the crops contained radioactivity don't disregard to the maximum permissible concentration of radioactivity which was adviced by I.C.R.P.

CdTe 蒸着薄膜의 光電導特性

朴鼎悳,金淳植 건국대학교 1978 學術誌 Vol.22 No.1

The CdTe thin film are prepared by vacuum evaporation method to place on the slide glass substrate under the pressure of 2∼4×10-5 Torr and the thin films are heated in temperature range of 100∼300℃ for 1∼5 seconds. The CdTe thin film sample are investigated spectral photosensitivity, resistance, photocurrent and light responce time constant and its results are obtained as following. The spectral photosensitivity are measured in wave length from 0.6 to 1.1 micrometer range, and a maximum photosensitivity is found at 0.9 micrometer. The resistance of sample at before heat treatment are measured 106~107Ω and after heat treatment it changed 107~108Ω, and photocurrent are measured in 1∼30 micro-ampere at 5000 Lux illadiation and the light response time constant are checked about 10-3 seconds.

한국인 젊은이의 혈중 연농도

박정덕,정규철 중앙대학교 의과대학 의과학연구소 1985 中央醫大誌 Vol.10 No.4

The lead concentration in whole blood were determined in 145 healthy young adults, 102 male and 43 female volunteers, aged from 16 to 25 years, who have had no apparent exposure to lead. Determination of lead was made by means of standard addition method using flameless graphited atomic absorption spectrophotometer(Model A5100, Baird Ltd). 1. In 145 measurements of lead in blood by standard addition method, correlation coefficients of optical density on lead concentration added ranged from 0.990 to 1.000 and regression coefficients ranged from 0.2000 to 0.3859. Since the mean recovery rate of lead 0.5, 1.5 and 2.5ng added to samples was 98.0%, 101.7%, 99.5% with coefficient of variation of 10.4%, 4.7%, 1.7%, respectively, the analytic method was found to be reliable with high precision. 2. Lead contents in whole blood did not fitted to the normal distribution; instead fitted to the long­normal distribution. 3. The arithmatic mean of lead concentrations in normal human blood was 14.8±6.22㎍/100ml and the geometric mean was 14.1±1.36㎍/100ml. 4. Mean concentrations of lead in whole blood were significantly higher in males than in females (p<0.01). 5. Lead levels in blood was higher among urban inhabitants than among rural inhabitants in female (p<0.01), and not significant in male.

한라산의 自生觀賞植物 利用開發을 爲한 特性調査 硏究 : 開花基를 中心으로 特性調査 A research made at the flowering period

朴正德 제주대학교 1972 논문집 Vol.4 No.-

Geographically the island of Quelpart(Jeju province) is the most southern point in Korea. Its latitude is 32˚2' and 126˚58'E. while the longitude is 32˚56' to 33˚8'N. Quelpart island consists largely of these extinct volcanic peaks surrounding Mt. Halla. Mt, Halla(1952m above the sea level) is the most highest mountain in this island, the slope to sea is gradual. The object of this study is to clarify of the ornamental plants on Mt. Halla and it is believed that those data may be also helpful for academic study. The survey were carried out from March 1972 to December 1972. This paper is concerned with Characteristics of 40 species of ornamental plants. The investigaton of characteristics is devided into 4 subject; 1) Time of sprouting 2) Period of blooming 3) Characteristics flower, size, color, inflorescence and smell. The data of the temperature and rainfall of the district were observed from the data of Seogi-po meteorological station (50 above the sea lebel) The selection of ornamental plants on Mt. Halla can be divided as follows. Deciduous broad leaved forest (600m∼1,200m) Generally, the association of Rhododendrom Yedoense V, poukhanense, Magnolia ssiedoldii, Weigella subsessilis, and Anemone amurensis, Primula jesoana was grow at the hillside. Evergreen Conigorous forest-Srub forest(1,500m-1,900m) The main constituent species of Alpins ornamental plant in this zone are as follows : Thymus guinguecostatus, Aguilegis japonica, Leontopodium coreana, Ranunculus erucilobus, Especially, Abies Koreana, Funiperus chinensis V. sargentii, and Empetrum nigum V. japonica association is well develloped in this zone. The species of which of blooming is lasted longer than 30 days are : Primula modesta Primula jesoana Cornus controversa Gentiana squarrosa Ranunculus erucilobus Potentilla fragarioides V. sprengeliana Anemone amurensis Magnola sieboldii Hydanges serrata for acuminata Ligularia Fischeri Thymus Quinquccostatus Leontopodium coreana Percentage by month order of blooming April………7% Aug.………10% May………35% Sep.………6% June………21% Oct.………5% July………16% Percentage by flower color White line………52% Violat line………17% red line………18% Yellow line………13% Species of smell flowers Ternstroemia japonica Thymus auinguecotsatus Magnolia sieboldii Melia Aejdarach V. japonica Pittosperum Tobira