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김용래,조기현,이영세,이송권,채종홍 한국산업위생학회 1995 한국산업보건학회지 Vol.5 No.1
Since being granted permission for self-assessment of the work environment by the Department of Labor in 1992, POSCO's Industrial Hygiene Laboratory has participated in domestic and Foreign Quality Control Programs 8 times and has obtained remarkable results. It has made a lot of effort to be a proficient laboratory with the ability to observe and analyse environmental monitoring data. The summary of results is as follows: 1. POSCO's Industrial Hygiene Laboratory has received a $quot;P(Proficient)$quot; grade from the round 115 to round 119 of AIHA/NIOSH PAT Program for analysis of such metals as lead, cadmium, zinc, and chromium, and also has received a $quot;P(Proficient)$quot; grade from its round 119 of for organic solvent analysis, i,e,. Trichloroethyiene(TCE), Carbon Tetr-achloride(CTC), 1.2-Dichloroethane(DCE), 1,1,1-Trichloroethane(MCM), Tetrachloroethylene (PCE), Chloroform(CFM), Benzene(BNZ), toluene(TOL), and O-xylene(OXY). 2. In the Quality Control Evaluation Program performed by the Industrial Health Research Institute, Korea Industrial Safety Corporation, POSCO has passed impressively in the 3-metal analysis test for lead, cadmium, cupper, and in the 6 organic solvent analysis test for Benzene(BNZ), toluene(TOL), O-xylene(OXY), Trichloroethylene(TCE) and Methyl isobutyl keton(MIBK), n-Hexane with 2 standard deviations. These analytic techniques should be practically applied to various fields, and reliable results of environmental monitoring should be considered to improve the work environment and to keep workers from occupation related diseases.
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철강용접자의 크롬 및 망간 노출평가와 산업위생관리 대책에 관한 연구
윤종국,이영세,박종안,이송권,채종홍,김억수 한국산업위생학회 2000 한국산업보건학회지 Vol.10 No.1
Results of environmental monitoring for 35 steel industry welders exposed to manganese and chromium fume were evaluated. Efficiency of respiratory protectors, welding face shields and local exhaust ventilation were also evaluated to establish more efficient preventive measures that can protect welders from occupational disease as related to welding fume. The results are as follows; 1. Total fume from CO₂ arc welding with mild steel occurred 1.5 to 2.2 times more than that from shielded meta arc welding. Chromium and nickel fume from welding with stainless steel occurred 27 to 59 times and 18 to 30 times, respectively, than those with mild steel. 2. Proportions of water-soluble chromium(VI) and insoluble chromium(VI) Compare to total chromium occurring from CC₂ arc welding with stainless steel were 10.5% and 8.7%, respectively, while those with mild steel were 57.1 to 63.2% and 31.6 to 38.1%, respectively. 3. The efficiencies of 4 types of respiratory protectors to reduce welding fume exposure were evaluated as 54.4 to 64.4%. 4. The reducing effect of head type welding face shield was 67.6%, and that of hand type welding face shield was 58.5%. The highest reducing effect was shown in air supply welding face shield as 99.2%, although it is not convenient to wear. 5. When welding face shield and respiratory protectors were worn together, the reducing efficiency increased to 79.0 to 87.5%. 6. When local exhaust ventilation was installed in workplace, the reducing efficiencies varied from 31.5 to 73.1% according to the types of welding.
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ASIC 저항성을 위한 ECCPoW 블록체인 구현 방법
정현준(Hyunjun Jung),채종홍(Jong-Hong Chae),이흥노(Heung-No Lee) 한국정보기술학회 2020 한국정보기술학회논문지 Vol.18 No.6
Bitcoin is the first cryptocurrency to participate in a network and receive compensation for online remittance and mining without any third-party intervention, such as financial institutions. Bitcoin mining is done through Proof-of- Work(PoW) and because of its characteristics, the higher hash rate, the higher the probability of mining. Thus, the emergence of a mining pool, which is called a mining organization, and unlike CPU/GPU, ASIC miners with high cost and performance efficiency have emerged. The problem is that the hash rate obtains thus exposes Bitcoin’s mining monopoly and the risk of double-payment attack. To solve this problem, we propose Error-Correction Codes Proof-of-Work (ECCPoW) combining the LDPC decoder and hash function. This paper proposes the implementation method of ECCPoW and replaces PoW of bitcoin with ECCPoW. Finally, We compare the proposed method and Bitcoin with mining centralization.
ScienceON
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