Ce_(0.8)Zr_(0.2)O₂ 촉매를 이용한 Dimethyl Carbonate 합성에서 탈수제 첨가의 영향

한기보,전진혁,박노국,이종대,류시옥,이태진,이병권,안병성 한국공업화학회 2004 응용화학 Vol.8 No.1

The effect of dehydrating agent in DMC(dimethyl carbonate) synthesis from methanol and carbon dioxide over Ce_(0.8)Zr_(0.2)O₂ catalyst was studied in this work. Ce_(0.8)Zr_(0.2)O₂ catalyst having the best activity among Ce_(1-x)Zr_(x)O₂ catalysts was selected. We could supposed that the addition of dehydrating agents improved the DMC yield by H₂O elimination. When the dehydrating agents such as Na_(2)SO₄ or K₂SO₄ was added into the synthesis of DMC, the formation amount of DMC increased to about 0.8∼0.9 mmol through the elimination of formed H₂O as by-product.

3급 부정교합 환자와 정상인에 있어서 하악소설과 Sigmoid Notch간의 거리에 관한 비교연구

박해승,안병근,이건주,김선해,박영주,유기준 한림대학교의료원 1994 人間科學 Vol.18 No.2

안면 골절의 후유증으로 인한 치아의 맹출장애 및 안모 비대칭 : A possible complication of facial fracture in child

이선재,유기준,송승희,서영진,조갑주,고부일,박영주,안병근 한림대학교의료원 1994 人間科學 Vol.18 No.11

랫드에서 인체 재조합 적혈구 조혈인자, rHuEPO의 13주 정맥투여 아만성독성에 관한 연구

김형식,곽승준,천선아,박현선,한하수,임소영,안미영,김원배,김병문,안병옥,홍성렬,이병무 성균관대학교 약학연구소 1998 成均藥硏論文集 Vol.10 No.1

A recombinant human erythropoietin (rHuEPO) was administered intravenously at dosage levels of 0, 100, 500, and 2500 IU/㎏/day for a period of 13 weeks. There were no observed clinical signs and deaths related to treatment in all groups tested. Decreases in body weight gain and food consumption were observed only in males of 2,500 IU/㎏ group after 2 weeks. In hematological parameters, erythrocyte content, hematocrit values and hemoglobin concentration were dose-dependently increased in rHuEPO treated groups. The ratio between kidney weight and whole body weight was significantly increased in females of 500 and 2,500 IU/㎏ groups. The spleen weight was also increased in both sexes of 500 and 2,500 IU/㎏ groups. However, the absolute weight change of other organs was not observed. In histopathological examinations, the renal tubular basophilia was observed only in males and females of 2,500 IU/㎏ groups. From these results, it is concluded that the no-observed adverse effect level(NOAEL) of rHuEPO is 100 IU/㎏ in rats in the present study.

Chronic administration of phosphodiesterase 5 inhibitor improves erectile and endothelial function in a rat model of diabetes

AHN, GOOK JUN,YU, JAE YOUNG,CHOI, SEUL MIN,KANG, KYUNG KOO,AHN, BYOUNG OK,KWON, JONG WON,KANG, SUNG KEUN,LEE, BYEONG CHUN,HWANG, WOO SUK Blackwell Science Ltd 2005 International journal of andrology Vol.28 No.5

<P>Summary</P><P>This study was conducted to determine if the long-term administration of the phosphodiesterase type 5 (PDE 5) inhibitor, DA-8159, to diabetic rats can ameliorate the development of erectile dysfunction (ED) and endothelial dysfunction. After inducing diabetes with streptozotocin, DA-8159 was orally administered at a dose of 3 mg/kg or 10 mg/kg for 8 weeks. To examine the effect on erectile response, electrostimulation of the cavernous nerve with the parameters of 3 V, 5 ms, 5 Hz or 10 Hz, was performed to measure the intracavernous pressure (ICP) and mean arterial pressure (MAP). Thoracic aorta relaxation <I>in vitro</I> was evaluated by adding acetycholine (Ach) cumulatively to the bathing medium. In addition, the plasma endothelin-1 (ET-1) levels were measured in order to investigate the effect of DA-8159 on endothelial dysfunction. The area under the curve (AUC) from the ICP/MAP ratio in the 10 Hz stimulation showed a significantly increased AUC after the 10 mg/kg treatment compared with the diabetic group (8891 ± 619 vs. 6316 ± 1016, respectively, <I>p</I> < 0.05). At the 5 Hz frequency, DA-8159 10 mg/kg also induced a significant increase in the AUC compared with the diabetic control. The maximum ICP/MAP ratio (%) of the 10 mg/kg treatment group was significantly higher in both the 10 Hz and 5 Hz frequency groups (<I>p</I> < 0.05). A treatment of 3 mg/kg tended to increase the AUC and peak ICP/MAP but was not statistically significant. The Ach EC<SUB>50</SUB> value of the diabetic group was significantly higher than in the normal control (120.50 ± 22.90 n<SMALL>M</SMALL> vs. 86.80 ± 9.30 n<SMALL>M</SMALL>, respectively), and 10 mg/kg treatment group showed a significantly lower EC<SUB>50</SUB> value (88.38 ± 19.7 n<SMALL>M</SMALL>). The ET-1 level was lower in groups treated with DA-8159, 3 mg/kg and 10 mg/kg treatment induced a statistical difference compared with the diabetic control (1.15 ± 0.34 fmol/mL vs. 2.51 ± 0.55 fmol/mL, respectively, <I>p</I> < 0.05). These results demonstrate that chronic administration of DA-8159 could attenuate the development of the ED in diabetes and its effect is associated with an improvement in the endothelial function.</P>

바인더의 첨가가 목재 펠릿의 연료적 특성에 미치는 영향

안병준 ( Byoung Jun Ahn ),장희선 ( Hee Sun Chang ),조선택 ( Seong Taek Cho ),한규성 ( Gyu Seong Han ),양인 ( In Yang ) 한국목재공학회 2013 목재공학 Vol.41 No.6

본 연구는 낙엽송과 백합나무 톱밥을 이용한 펠릿의 제조 과정에서 바인더로 일정량의 유채박, 커피부산물,수피, 솔방울, 리그닌 분말을 첨가하여 바인더의 종류 및 첨가량이 내구성을 포함한 펠릿의 품질에 미치는 영향을 알아보기 위하여 수행하였다. 바인더와 함께 제조한 펠릿의 품질은 국립산림과학원에서 고시한 목재 펠릿 품질 규격 1등급 기준을 대부분 상회하였으며, 일부 과다한 양의 바인더를 첨가하여 제조한 펠릿에서만 높은 회분함량으로 2~3등급 기준을 만족하는 것으로 조사되었다. 바인더 종류 및 첨가량에 따른 펠릿의 내구성은 리그닌,유채박 그리고 커피부산물을 첨가하여 제조한 펠릿에서 우수하였으며, 백합나무 펠릿은 첨가량의 증가와 함께 내구성도 향상되었다. 한편 낙엽송 펠릿의 경우 첨가량의 증가에 따른 내구성 향상 효과는 크지 않았으며, 수피와 솔방울을 바인더로 사용하였을 때 첨가량의 증가와 함께 내구성이 감소하였다. 제조된 펠릿의 광학/전자현미경 관찰을 통하여 바인더의 종류에 따른 차이를 명확하게 확인할 수 없었으나, 첨가량에 따른 차이는 명확하게 관찰 할 수 있었다. 결과를 종합하면, 바인더의 첨가는 목재 펠릿의 품질 향상에 대부분의 항목에서 기여하였으며, 특히 커피부산물을 바인더로 사용하여 제조한 펠릿의 경우 모든 품질에서 뚜렷한 향상을 확인할 수 있었다. 향후 저렴한 바인더의 안정적인 확보가 이루어진다면 바인더의 첨가로 인하여 연료적 품질이 향상된 목재 펠릿의 상용화가 가능할 것으로 확신한다. This work was conducted to investigate the effect of the addition of binders, such as rapeseed flour, coffee waste, bark, pine cone and lignin powder, on the fuel characteristics of the pellets fabricated with larch and tulip tree sawdust. Moisture content, bulk density and higher heating value of most pellets fabricated with the binders exceeded the lst-grade pellet standard designated by Korea Forest Research lnstitute, but ash content of the pellets fabricated with rapeseed flour or bark of 10wt on the dry weight basis of sawdust was satisfied with just the 2nd-or 3rd-grade standard. The durability of tulip tree-pellets was positively influenced by the addition of rapeseed flour. Coffee waste or lignin powder and increased with increasing the amount of the binders. For larch-pellets the increase of binders did not greatly affect the durability, and even the durability reduced with the increase of bark or pine cone. From the microscopic observation, the obvious feature of pellet surfaces was not identified by the type of binder but by the addition amount of the binder. In summary, the addition of binders contributed to the fuel characteristics of wood pellets, and particularl the characteristics of wood pellets fabricated with coffee waste improved greatly. Therefore, if the binders are secured sufficiently with a reasonable cost, it might be possible to commercialize wood/binder pellets, which have better fuel characteristics than conventional wood pellets.

탄화물이 토양미생물 및 고추 생육에 미치는 영향

안병준(Byoung Jun Ahn),조성택(Sung Taig Cho),조태수(Tae Su Cho),이성재(Sung Jae Lee),이윤수(Yoon Su Lee) 한국산림바이오에너지학회 2003 산림바이오에너지 Vol.22 No.3

목재의 탄화과정 산물인 목탄과 목초액의 농업적 이용의 일환으로 고추 생육 및 토양미생물에 미치는 영향을 조사하였다. 목탄과 목초액을 토양에 처리할 경우 토양을 중성으로 개량하는데 효과적이고 토양의 이화학적성질이 유용 미생물이 생육하기에 적합한 환경조건으로 변화되어 토양 내 유용미생물의 밀도 증가로 나타났다. 고추의 생육에 있어서도 탄화물 처리로 고추모의 길이, 직경생장 및 고추 결과 수가 증가되었다. 특히 결과 수에서는 목탄 1kg, 목초액 1000배액 및 세균처리에 의하여 대조구보다 약 50% 정도의 증수 효과를 나타냈다. 고추모의 길이 및 줄기직경 증가는 노지에서 여러 가지 환경 변화 요인에 대한 저항성을 갖게 하여 최종 수확량의 증대로 나타날 것으로 사료된다. 고추 탄저병균에 대한 길항성 실험에서는 목초액 농도 2배, 10배에서는 곰팡이가 사멸되었고, 100배, 1000배 희석농도에서는 대조구보다 성장 속도가 둔화되었다. As a part of agricultural utilization of charcoal and pyroligneous acid, the effect of wood carbonization products on the growth of red pepper and soil microorganisms was investigated. The treatment of charcoal and pyroligneous acid provided good growth conditions to microorganisms through neutralizing soil acidity and improving the physicochemical properties of soil. Therefore the density of useful microorganism in the soil has been increased. In the growth of red pepper, the length, diameter, and the fruit numbers of red pepper have been increased by treating with wood carbonization products. It was especially shown that yield has increased about 50% in the fruit number, by treating charcoal 1㎏, 1000 time-diluted solution of pyroligneous acid and bacteria, compared with the control. It was estimated that increasing the length of seedling and the diameter of red pepper stem contributed to the resistance against the prerequisites of various environmental changes in open field. Therefore, the final yield would be increased. In the antagonism experiment of red pepper mold (Colletotrichum gloeosporioides), the mold became extinct in the 2- and 10-time diluted solution of pyroligneous acid, compared with the control. On the other hand, their growth speed was delayed in the 100- and 1000 time-diluted solution.

혼합고지의 효소 탈묵 및 무염소 표백

안병준 ( Byoung Jun Ahn ),백기현 ( Ki Hyon Paik ) 한국공업화학회 2002 공업화학 Vol.13 No.7

본 연구는 사무실 혼합고지의 효소탈묵과 무염소 표백의 효율을 밝히는 데 있다. 무염소 표백 후, 효소로 탈묵된 펄프의 백색도 증가는 기존 약품으로 탈묵된 펄프의 표백 후 백색도 증가보다 2∼3 포인트 높았다. 3단 표백방법 중 환원표백-오존-과산화수소 3단 표백이 백색도 증가에 가장 효과적이었으며 표백 전 백색도가 낮은 경우(29.2∼30.4% ISO)에는 Y 표백, 표백 전 백색도가 높은 경우(58.0% ISO)에는 F 표백이 우수한 결과를 나타냈다. 3단 표백 후 표백 펄프에서 b값의 변화는 표백방법에 따라 상당한 차이를 나타내고 있지만, a값은 대부분 y축에 근접한다. 환원표백제는 a, b값에 대하여 많은 영향을 미친다. 혼합고지는 색지의 혼입으로 인해 산화계 표백제만으로는 색 제거에 어려움이 있으므로 환원표백제를 통한 색 제거가 필수적이다. 그러나 혼합고지의 표백 전 백색도가 높을수록 환원표백제는 산화표백제에 비해 효과가 감소되었다. 한편 모든 3단 표백에서 최소한 15% 이상의 인장 및 파열지수의 감소가 발생하였다. This experiment was executed to determine the efficiency of enzyme deinking and totally chlorine-free bleaching of MOW. After totally chlorine-free bleaching, the increase on brightness by the enzyme-deinked pulp was two or three points greater than that of the pulp deinked with conventional chemical. Among the three-stage bleaching. Y (or FAS) sequence was the most effective on the improvement of brightenss, Y stage was favorable for the bleaching of low initial brightness, and FAS stage was good for that of high initial brightness. After the three stage bleaching, the variation of b value in deinked pulp depended on the types of bleaching methods used, however, the a value was close to the y axis. In every three-stage bleaching, the decrease of the tensile strength and the burst strength was at least 15%.

케이블TV 네트워크 고도화를 위한 RF/PON 전송시스템에 관한 연구

안병준(Byoung-Jun Ahn),박승권(Sung-Kwon Park) 한국통신학회 2014 韓國通信學會論文誌 Vol.39 No.8(네트워크)

최근 케이블 방송통신서비스는 HD방송에서 3D방송, UHD방송으로 고품질화 되고 100Mbps인터넷에서 1Gbps 인터넷으로 광대역화 되고 있는 상황이다. 그러나 현재 운용중인 HFC망 기술로는 고품질 광대역 서비스를 수용하는 용량에 한계가 있다. 전통적인 HFC망 구조를 유지하면서 네트워크를 고도화하는 대표적인 기술인 DOCSIS3.1, EPOC은 상/하향 주파수대역 확장, 망 업그레이드 비용, 장치 상용화 시기 등 이슈가 있다. HFC망을 FTTH망 구조로 고도화하는 기술은 RFoG, RF Overlay PON이 있으나 네트워크 고도화 비용, 기존 STB 호환 등 이슈가 있다. 본 논문에서는 기존 케이블 방송통신 시스템을 활용하면서 RF 주파수에 제약 없이 1Gbps이상 광대역 인터넷 서비스를 제공하며 댁내 다양한 IP 디바이스에 N 스크린 서비스를 제공하는 RF/PON기반 양방향 Giga급 전송시스템을 제안한다. 제안한 RF/PON시스템을 개발 및 구현하여 실시간 방송과 1Gbps인터넷 동시 제공, 멀티스크린 서비스 등 성능시험을 통해 평가한다. Recently, Cable communications services are becoming the HDTV to 3DTV, UHDTV broadcasting and 100Mbps to 1Gbps Internet. however existing technologies are limited to provide high-quality broadband services in the HFC network. The network upgrade technologies have some problems that Up/Downsteam frequency extension, Cost of upgrading by using DOCSIS3.1, EPOC and Legacy STB compatibility, Cost of upgrading the network by RFoG, RF overlay PON. This paper propose the RF/PON based gigabit Transmission system in order to provide the 1Gbps internet without using frequency and the Multiscreen to IP devices. After the proposed RF/PON system was developed and implemented, this paper evaluate the performance of RF/PON system for simultaneously real-time braodcasting and 1Gbps internet, Multiscreen service, and so on.

대두 유색잉크로 옵셋 인쇄된 신문용지의 열화기간 및 탈묵 약품에 따른 탈묵성 비교

안병준(Byoung Jun Ahn),백기현(Ki Hyon Paik) 한국공업화학회 2000 공업화학 Vol.11 No.4

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