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원정일,이광목 가톨릭 대학 산업의학 쎈타 산업의학연구소 1994 韓國의 産業醫學 Vol.33 No.2
This study was performed to investigate ingredients of organic solvents and present status of environmental measruements with official records of working environmental measurements of 799 workplaces in 179 workshops used organic solvents. The result were as follows: 1. The mean of total sampling time and actual time measuring organic solvent were 158?80 min and 72?37 min. In 62.5% of 799 sample the air flowrates were above 0.2?/min. 2 Thirty kinds of organic solvent were detected in the working environments. The most common organic solvent was toluene(95.4%) and followed by xylene(47.1%), MEK(36.5%) and n-hexane(35.3%) in descending order. 3. The average number of species detected per a mixed organic solvent sample was 4.4?2.6, and there was no significant difference in the detection number among type of workplaces. 4. The mean exposure concentrations was the highest in acetone(86.6?167.8ppm) and followed by MEK(37.7?59.6ppm) and toluene(28.7?48.4ppm). While considering the TLV, the mean exposure concentrations were 7.9?10.8ppm(TLV:10ppm) in N.N-dimethy1 formamide, 4.9?5.0ppm(TLV:10ppm) in benzene and 2.1?1.5(TLV:5ppm)in methy1 cellosolve acetate in descending order. 5. Among the 799 workplaces, 20% workplaces were evaluated with exceed TLV in case of sample organic solvents. In case of mixed organic solvents, the TLV exceed rate of workplaces was 40.0%. 6. 72.1 of workplaces were received two consecutive environmental measurements a year and 57.3% of them was not exceeded TLV. The average concentration of organic solvents in the 1st half year was 1.16?1.09 and most of them were above 1.0 TLV. The average concentration of the 2nd half year period was 0.81?0.59 which was somewhat lower than those of the 1st half period. 7. The percentage of workplaces with local ventilation was 65.1%. Among them 25.2% local ventilation was evaluated with poor and 34.9% workplaces was not in-stalled and local ventiliator. According to the performance of ventilator, the concentration of the organic solvents was 0.44?0.30 at well-instituted ventilator, that with poorly-instituted was 1.32?0.66 and that with unistitutied was 1.75?1.27. On the basis of about data, ingradient analysis of mixed organic solvents should be perform prior to eveluation of organic solvents and should evaluated with mixed organic solvent TLV.
Brevibacterium albidum중의 제한효소 Bal I의 정제 및 특성에 관한 연구
박정수,배광묵,박재윤,고광삼 朝鮮大學校 附設 醫學硏究所 1987 The Medical Journal of Chosun University Vol.12 No.1
In this report, Bal I endonuclease from brevibacterium albium (ATCC 15831) strain was purified characterized. Bal I endonuclease was purified by the following procedures; ammonium sulfate fractionation, DEAE-cellulose column chromatography, phosphocellulose column chromatography. Bal I endonuclease has a specific site for type II enzyme in that has been proven by the facts that PBR322 DNA cleaved by Bal I endonuclease. All sited cleaved by Bal I are also cut by the speficif endonuclease Hae III from haemephilus aegyptiu. The recognition sequence of Bal I are. ◁수식 삽입▷ (원문을 참조하세요)
위험평가(Risk Assessment)에 의한 업종별 위험(Risk)의 구분
박동욱,박덕묵,정광수,윤충식,김태형,노영만,이경남,이송권,김현욱 한국산업위생학회 2003 한국산업보건학회지 Vol.13 No.2
A total of 514 workplaces in 17 industries were inbestigated through walk-through survey. These industries were all small companies with less than five workers and didn't have work environmental measurement data. These industries were ranked by risk that was evaluated by combination of toxicity and possibility of exposure to chemical hazardous agents produced at operations of industry. Risk Index(RI) was qualitatively combined by the combination between hazard and potential of exposure to chemical hazardous agents. Industries that were regarded as having the highest risk were wood and products of wood, chemicals and chemical products, basic metals, other vehicles, trailers and semi-trailers, and fumiture manufacturing. These industries were found to have operations with higher risk than other industries. This study found that more attentions should be paid to these industries with that more attentions should be paid to these industries with high risk.
연폭로여성근로자들에서의 생물학적 연폭로 지표들의 상호관계
남택승,한구웅,김형아,김정만,이광묵 가톨릭대학 산업의학쎈타 산업의학연구소 1986 韓國의 産業醫學 Vol.25 No.3
For the purpose of obtaining of an effective biological monitoring data in terms of evaluation the health consequences of lead absorption, the female workers in the electronic industry who have been exposed to low-level lead occupationally were chosen as the subjects of our studies. We observed the 9 parameters in not only 305 lead-exposed female workers who have been exposed to lead occupationally also 254 normal female subjects who have not been exposed to lead occupationally. The parameters chosen for this study were as follows, blood lead (PbB), urine lead (PbU), δ-aminolevulinic acid in urine(ALAU), coproporphyrin in urine(CPU), zinc protoporphyrin in whole blood(ZPP), hemoglobin(Hb), hematocrit(Ht), δ-aminolevulinic acid dehydratase(ALAD) activity & ALAD activity ratio(A/R; absorbance at substrate pH 6.6/absorbance at substrate pH 5.8). The results obtained were as follows: 1. The average age of the lead-exposed female workers in the electronic industry and in the normal female subjects were 20.5±4.2 years and 21.7±3.5 years, respectively. 2. The average work duration of the lead-exposed female workers in the electronic industry was 26.4±19.4 months 3. The mean value of PbB of the lead-exposed female workers in the electronic industry and in the normal female subjects were 30.18±6.64㎍/100ml and 21.61±3.84㎍/100ml respectively. 4. In the lead-exposed female workers of the electronic industry and of the normal female subjects, the mean value of ZPP were 36.22±0.69㎍/100ml and 24.64±7.21㎍/100ml, respectively 5. In the lead-exposed female workers of the electronic industry and of the normal female subjects, the mean value of Hb were 13.98±0.57g/100ml and 14.09±0.66g/100ml, respectively. 6. The mean value of the lead-exposed female workers in the electronic industry were 55.07±17.61㎍/1 for PbU, 1.93±0.69mg/1 for ALAU, and 49.74±22.79㎍/1 for CPU, while in the normal female subjects, 44.27±15.76㎍/1 for PbU, 1.46±0.55mg/ 1 for ALAU, and 38.66±17.99㎍/1 for CPU. 7. Among various pairing of the parameters of lead exposure in the female lead-exposed workers and in the normal female subjects, the correlation between PbB and ZPP showed the highest coefficient value.
Efficacy evaluation of syringe pump developed for continuous drug infusion
Jung, Bongsu,Seo, Kwang-Suk,Kwon, Suk Jin,Lee, Kiyoung,Hong, Suyong,Seo, Hyounsoon,Kim, Gi-Young,Park, Geun-Mook,Jeong, Juhee,Seo, Soowon The Korean Dental Society of Anesthsiology 2016 Journal of Dental Anesthesia and Pain Medicine Vol.16 No.4
Background: In dental intravenous sedation, continuous intravenous infusion of a low-dose drug requires an infusion pump such as a syringe pump. To develop a new syringe pump for clinical use, the functions of the pump must meet certain international standards. Various safety and efficacy tests must be performed on the syringe pump, as stipulated by these standards, and an approval must be received from the approving agency based on such test results. Methods: The authors of the present study developed a novel syringe pump and performed efficacy evaluation by testing its infusion speed at 1 and 25 ml/h, and infusion performance testing at 2 and 24 h. Moreover, performance evaluation was conducted by comparing the novel pump to an existing pump with the infusion speed varied from 1 to 5 ml/h. Results: In the efficacy testing on the newly developed syringe pump, infusion with the infusion speed initially set to 1 ml/h resulted in infusion speeds of 1.00 and 0.99 ml/h in the 2- and 24-h assessment, respectively. Changing the infusion speed setting to 25 ml/h resulted in an infusion speed of 25.09 and 23.92 ml/h in the 2- and 24-h assessment, respectively. These results show no significant differences when compared with other commercially available pumps. Conclusions: The efficacy testing of the newly developed syringe pump showed the accuracy to be within tolerance. Based on these findings, we believe that the newly developed syringe pump is suitable for clinical use.
Lee, Kwang-Ho,Kim, Sang-Mook,Jeong, Huisu,Jung, Gun-Young The Royal Society of Chemistry 2012 SOFT MATTER Vol.8 No.2
<p>We develop an innovative solution processable edge lithography, which we call double-dewetting edge lithography (DDEL). The polymer solution spontaneously dewets the hydrophobic regions and covers only hydrophilic regions on a surface energy-engineered substrate, which is achieved by a combination of conventional photolithography and a subsequent hydrophobic treatment of the exposed areas. Then, the secondary dewetting occurs through a coffee stain effect during the solvent evaporation, leaving polymer edge patterns behind. The whole double-dewetting phenomenon is complete within 1 s. This technique is a fast, cost-effective and easy direct solution patterning method, which enables nanoscale polymer edge patterns to be produced from various micron-scale platforms including lines, angular and irregular shapes.</p> <P>Graphic Abstract</P><P>During double-dewetting edge lithography, a polymer solution initially fully covers only hydrophilic treated circular surfaces. As the solvent evaporates, the solution moves towards the edges and the solute aggregates at the periphery of the circles, generating polymer ring patterns. <img src='http://pubs.rsc.org/ej/SM/2011/c1sm06431b/c1sm06431b-ga.gif'> </P>