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김정은,황선일,이성봉,신상운,권혜정,이지연,이병훈,모아라,최옥경,Kim, Jeong-Eun,Hwang, Seon-Il,Lee, Seong-Bong,Shin, Sang-Woon,Kwon, Hye-Jung,Lee, Ji-Yeon,Lee, Byoung-Hoon,Mo, A-Ra,Choi, Ok-Kyung 한국식품위생안전성학회 2022 한국식품위생안전성학회지 Vol.37 No.3
In this study, heavy metals (lead, cadmium, and mercury) and shellfish poisoning toxins (diarrhetic shellfish poisoning toxins, amnesic shellfish poisoning toxins) were investigated in a total of 104 shellfishes. According to the analysis of heavy metals, lead (Pb) was detected in the range of 0.0177-0.5709 mg/kg, cadmium (Cd) was detected in the range of 0.0226-1.4602 mg/kg, and mercury (Hg) was detected in the range of 0.0015-0.0327 mg/kg. Levels of Pb, Cd, and Hg were acceptable by Korean standards. Okadaic acid (OA) and dinophysistoxin-1 (DTX-1) were investigated for monitoring of diarrhetic shellfish poisoning toxins and OA and DTX-1 were not detected. As a result of monitoring of amnesic shellfish poisoning toxins, domoic acid was detected in 5 of 104 samples and detection ratio was 4.8%. The detection period was found as follows; 1 case in January, 1 case in February, 1 case in May, 2 cases in September. These showed that continuous monitoring for the management of shellfish poisoning toxins and heavy metals is required. In addition, this study can be used as reference data to strengthen managing heavy metals in fishery products.
Tunnel Oxide Uniformity 개선을 통한 신뢰성향상에 대한 연구
강윤성(Yun Seong - Kang),박현호(Hyun-Ho Park),김종환(Jong-Hwan Kim),신상봉(Sang-Bong Shin) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The semiconductor industry, such as significant CPU SYSTEM LSI (Large Scale Integrated circuit) and Memory can be divided into areas. Especially in recent memory, part of Dynamic Random Access Memory (DRAM) and Flash memory technologies with the (technology) has shown a marked development. For example, its fragmentary 2001 ITRS (Internal Technology Roadmap for Semiconductor) in the nonvolatile (Non-Volatile Memory, NVM) technology requirement roadmap has been added. With this trend, many memory manufacturers to present the development and mass production of NVM devices has progressed. Of particular interest in the NVM products Micro Processor Unit (MPU) or different perspective and scaling in DRAM products for NVM technology node (technology node) of the tunnel insulating film thickness (tunnel oxide thickness), write / erase voltages (program / erase voltage), data maintenance (data retention) SYSTEM LSI products with characteristics different from reduced (scaling) is progressing slowly, since the generation of 65nm design rule also in the reduction (scaling) is not a constant, and is characterized by: These flash memory devices require the unique characteristics of the end (intrinsic quality) is required to improve. In this study, the most important factor in NVM devices (critical factor) NAND flash tunnel oxide is improved through the Thickness variation was studied for ways to improve reliability.
가연성 폐플라스틱 활용한 공간속도(GHSV) 따른 열분해특성비교 및 수소생산연구
한종일(Jong-il Han),송민호(Min-Ho Song),신상봉(Sang-Bong Shin),서정수(Jung-Soo Suh) 적정기술학회 2023 적정기술학회지(Journal of Appropriate Technology) Vol.9 No.1
본 연구에서 폐플라스틱활용하여 기체공간속도 (GHSV)와 수소생산 반응기용 각종 촉매의 성능에 따라 실험실 규모의가스화 반응기를 이용하여 열분해 합성유와 합성가스 (H2/CO)를 생산한다 . 폐플라스틱의 주성분인 HDPE, PP, PS를 시료로 선정하였다 . 합성가스 생산으로 고부가가치 수소생산 가능 증기에서 열분해를 개선한 촉매 개질반응을 통해 수소를 생산할 수 있다 . 무촉매 원유의 생산량은 70.2 wt%로 높았으며 , 원유 중 18개 이상의 탄화수소 왁스의 탄화수소가 70.47%를 차지했습니다 . 반면에 촉매를 이용하여 원유를 생산하는 경우에는 그 양이 감소하였으나 C5~C14의 탄화수소 비율이 증가하였다 . GHSV에 따라 결정된 각 촉매의 열분해 결과적으로 10,000 hr-1, 8,000 hr-1, 5,000 hr-1, GHSV 의 경우 합성유 생산량이 다른 두 조건보다 많았으나 C5~C14의 탄화수소는 30~40%였다 . 이를 바탕으로 열분해 원유의 열량은 최대 11.583 kcal/kg이고 열분해 합성유 수율은 58%임을 확인하였다 . 내부 순환 열분해 가스화 반응기의 실험실 규모에서 폐플라스틱은 촉매로 열분해되고 , 열 및 물질수지는 등온 온도에서 촉매 , 열 및 수지로 PS, PE, PP 및프탈레이트와 같은 플라스틱첨가제 제품을 생산할 수 있다 . This Study using combustibe waste plastic compared the pyrolysis Characteristics according to GHSV and the perfor- mance of various catalysts for hydrogen production reactor. pyrolysis synthetic oil and synthetic gas (H2/CO) of waste plastic are produced using a gasification reactor in a lab scale. HDPE, PP, PS, among the main components of waste plastic were selected as a sample. It was possible to produce high value added hydrogen by producing hydrogen and crude oil through the catalytic reforming reaction that is improved the pyrolysis in vapor. The production of crude oil without cat- alysts was high at 70.2 wt% and among oil with more 18 hydrocarbons wax’s hydrocarbons accounted for 70.47%. On the other hand in the case of producing crude oil using a catalyst the amount decreased, but the hydrocarbon percentage of increased C5~C14. As a result of the pyrolysis of each of the catalysts determined according to the GHSV. 10,000 hr-1, 8,000 hr -1, 5,000 hr-1, amount of synthetic oil produced in the case of the GHSV was higher than the other two conditions, but the hydrocarbon of C5~C14 was 30~40%. Based on this it was confirmed that the caloric value of the pyrosis crude oil was up to 11.583 kcal/kg and the pyrolysis oil yield was 58%. In a lab-scale in ternal circulating pyolysis gasification reac- tor waste plastic is pyrolyzed into catalysts, heat and material resins pyrolyzed into catalysts, heat and material resins at isothermal temperature to produce plastic products such as PS, PE, PP and phthalate.