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볏짚으로부터 바이오오일 생산에 대한 열분해 반응온도의 영향
강보성,박영권,김주식,Kang Bo-Sung,Park Young-Kwon,Kim Joo-Sik 한국자원리싸이클링학회 2006 資源 리싸이클링 Vol.15 No.1
볏짚은 국내에서 유용한 재생 가능한 바이오매스이다. 유동층과 char 분리 장치가 구비된 급속 열분해 장치를 이용하여 볏짚으로부터 바이오오일의 생산에 대한 실험을 수행하였다. 본 연구는 온도변화에 따른 볏짚의 열분해 생성물의 분포와 생성물의 화학적 구성을 알아보고 바이오오일의 활용 가능성을 고찰하고자 했다. 급속 열분해 반응은 $466^{\circ}C,\;504^{\circ}C,\;579^{\circ}C$에서 각각 수행되었다. 유동화 매체로는 생성가스를 사용하였으며 유량은 약 30NL/min 였다. 볏짚의 열분해 결과 기체, 액체, 고체 물질을 얻을 수 있었으며, 기체물질은 GC(TCD, FID)를 이용하여 정성적, 정량적 분석을 하였다. 액체물질은 상등액과 tar가 풍부한 하등액으로 분리하여 발열량, 원소분석, 수분, GC/MS를 통해 화학구성성분을 분석하였다. 고체물질인 char는 원소분석을 하고 그 발열량을 측정하였다. 액체물질인 바이오오일은 화학특성 분석결과 대체 연료유뿐만 아니라 화학 원료물질로서의 사용가능성을 볼 수 있었다. Rice straw is one or the main renewable energy sources in Korea. Bio-oil is produced from rice straw with a lab-scale equipment mainly with a fluidized bed and a char removal system. It was investigated how the reaction temperature affected the production of bio-oil and the efficiency of a char removal system. To elucidate how the temperature depended on the production of bio-oil, experiments were conducted at $466^{\circ}C,\;504^{\circ}C\;and\;579^{\circ}C$, respectively. The mass balance was established in each experiment, and the produced gas and oil were analyzed with the aid of GCs and a GC-MS system. The char removal system is composed of a cyclone and a hot filter. Tn the experiments, we observed that the production of bio-oil was decreased with temperature, and the bio-oil contained very useful chemicals.
강보성 ( Bo Seong Kang ),양성기 ( Sung Kee Yang ),정우열 ( Woo Yeol Jung ) 한국환경과학회 2015 한국환경과학회지 Vol.24 No.4
As global warming has accelerated to weather in recent years, and The frequent floods are creating heavy rains and typhoons followed by considerable damage in Jeju. This study estimated design flood discharges and flood stage in Jeju, considering climate change in connection with RCP scenario, the 5th IPCC Report recently published. It also analyzed the period which might be subject to the risk of flooding in downstream of Oedo Stream. As a result, it has analyzed that there might be a risk of flooding when there were 80 years or more rainfall events in 35 years that rainfall would have increased by 10%, 69 years that 100 years or more heavy rain and rainfall would have increased by 20%, and 104 years that 100 years or more heavy rain and rainfall would have increased by 20%. It is expected that this study results of rainfall increasing trend caused by climate change will be helpful to minimize the damage of floods which will secure the future of Jeju.
레이더 자료의 강우보정 및 Vflo를 활용한 도심하천의 홍수량 산정
강보성 ( Bo-seong Kang ),양성기 ( Sung-kee Yang ),김용석 ( Yong-seok Kim ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.4
This research aims at comparing the accuracy of flood discharge estimation. For this, we focused on the Oedo watershed of Jeju Island and compared flood discharge by analyzing the values as follows: (1) the concentration of the lumped model (HEC-HMS) and distributed model (Vflo), and (2) the in-situ data using Fixed Surface Image Velocimetry (FSIV). The flood discharge estimation from the HEC-HMS model is slightly larger than the Vflo model results. This result shows that the estimations of the HEC-HMS are larger than the flood discharge data by 4.43 to 36.24% and that of the Vflo are larger by 8.49 to 11%. In terms of the error analysis at the peak discharge occurrence time of each mapping, HEC-HMS is one hour later than the measured data, but Vflo is almost the same as the measured data.
강보성 ( Bo Seong Kang ),양성기 ( Sung Kee Yang ),정우열 ( Woo Yeol Jung ),김용석 ( Yong Seok Kim ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.4
This study Analyzed four of seven runoffs which had happened in 2012 in comparison with the runoffs shown in Kalesto data, using the fixed surface image velocimetry (FSIV) installed at Oedo stream, Jeju Island. As a result of identifying a runoff curve graph, it was analyzed that the flood runoffs calculated with two observation devices were almost equivalent. As the differences in peak flows were 10 m3/s, 0.7 m3/s and 3 m3/s, the very similar result values were calculated. Even though there were errors in RMSE(Root Mean Square Error) made by two observation devices according to the degree of the peak flow, the values of R² by flood event were 0.89, 0.87, 0.86 and 0.82, showing the result values almost close to 1. Therefore, there was a very high correlation in flood runoffs calculated with two observation devices. This research method was considered to be a very suitable method to measure unexpected flood runoffs which could happen in the island area such as Jeju island during bad weather.
한천유역의 수문학적 특성을 고려한 관측자료 기반 홍수량 산정
양성기 ( Sung-kee Yang ),김민철 ( Min-chul Kim ),강보성 ( Bo-seong Kang ),김용석 ( Yong-seok Kim ),강명수 ( Myung-soo Kang ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.12
This study reviewed the applicability of the existing flood discharge calculation method on Jeju Island Han Stream and compared this method with observation results by improving the mediating variables for the Han Stream. The results were as follows. First, when the rain-discharge status of the Han Stream was analyzed using the flood discharge calculation method of the existing design (2012), the result was smaller than the observed flood discharge and the flood hydrograph differed. The result of the flood discharge calculation corrected for the curve number based on the terrain gradient showed an improvement of 1.47 - 6.47% from the existing flood discharge, and flood discharge was improved by 4.39 - 16.67% after applying the new reached time. In addition, the sub-basin was set separately to calculate the flood discharge, which yielded an improvement of 9.92 - 32.96% from the existing method. In particular, the steepness and rainfall-discharge characteristics of Han Stream were considered in the reaching time, and the sub-basin was separated to calculate the flood discharge, which resulted in an error rate of -8.77 to 8.71%, showing a large improvement of 7.31 - 28.79% from the existing method. The flood hydrograph also showed a similar tendency.
다층구조 압출 발포 자동차 대형 내장 부품 개발에 관한 연구
곽성복(Sung Bok Kwak),이동기(Dong Gi Lee),주상률(Sang Ryool Ju),조창현(Chang Hyun Cho),김준형(Joon Hyung Kim),고재송(Jae Song Koh),강보성(Bo Sung Kang),정선경(Sung Kyung Jeoung),유승을(Seung Eul Yoo),남재도(Jae Do Nam) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Thermoplastic foams are materials that are composed of a cellular core structure created by the expansion of a blowing agents of volatile gases or liquids, which can be economically used in insulating, packaging, and automobile industries. It due to the optimized properties of stiffness, strength, and energy absorption. Thermoplastic olefins(TPO) are currently evaluated as a potential replacement of PVC or ABS blends in automotive interior skins such as Door Trim(DT) and Instrument Panel(IP) skins. Some of the advantages of TPO over PVC or ABS skins are improved UV and heat aging, reduced fogging due to absence of plasticizer exudation, and recyclability. In this study, the nucleation and volume expansion behaviors of ethylene-octene copolymer were investigated at when different types of PP with different Melting Index(MI) values were incorporated in the foaming process. The effects of polypropylene and its melt flow characteristics on the cell density, final expansion ratio, and foam morphology were examined.
곽성복(Sung Bok Kwak),김재옥(Jae Ok Kim),이동기(Dong Gi Lee),주상률(Sang Ryool Ju),김준형(Joon Hyung Kim),고재송(Jae Song Koh),강보성(Bo Sung Kang),정선경(Sun Kyung Jeoung),유승을(Seung Eul Yoo),남재도(Jae Do Nam) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, the trend of automotive interior parts is focused on improvement of light weight materials. Thermoplastic foams are materials that are composed of a cellular core structure created by the expansion of blowing agents of volatile gases or liquids, which can be economically used in insulating, packaging, and automobile industries. Thermoplastic olefins (TPO) are currently evaluated as a potential replacement of PVC or ABS blends in automotive interior skins such as Door Trim (DT) and Instrument Panel (IP) skins. In this study, micro cellular foaming materials applied automotive instrument panel was investigated.