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Power IC용 저면적 Differential Paired eFuse OTP 메모리 설계
박헌,이승훈,진교홍,하판봉,김영희,Park, Heon,Lee, Seung-Hoon,Jin, Kyo-Hong,Ha, Pan-Bong,Kim, Young-Hee 한국정보전자통신기술학회 2015 한국정보전자통신기술학회논문지 Vol.8 No.2
In this paper, a small-area 32-bit differential paired eFuse OTP memory for power ICs is designed. In case of smaller number of rows than that of columns for the OTP memory cell array, a scheme for the cell array reducing the number of SL driver circuits requiring their larger layout areas by routing the SL (source line) lines supplying programming currents for eFuse links in the row direction instead of the column direction as well as a core circuit is proposed. In addition, to solve a failure of being blown for non-blown eFuse links by the electro-migration phenomenon, a regulated voltage of V2V ($=2V{\pm}0.2V$) is used to a RWL (read word line) driver circuit and a BL (bit line) pull-up driver circuit. The layout size of the designed 32-bit eFuse OTP memory is $228.525{\mu}m{\times}105.435{\mu}m$, which is confirmed to be 20.7% smaller than that of the counterpart using the conventional cell array routing, namely $197.485{\mu}m{\times}153.715{\mu}m$. 본 논문에서는 Power IC용 저면적 32비트 differential paired eFuse OTP 메모리를 설계하였다. OTP 메모리 셀 어레이에서 행의 개수가 열의 개수보다 더 작은 경우 eFuse 링크의 프로그램 전류를 공급하는 SL (Source Line) 구동 라인을 열 방향으로 라우팅하는 대신 행 방향으로 라우팅하므로 레이아웃 면적을 많이 차지하는 SL 구동회로의 수를 줄이는 differential paired eFuse 셀 어레이 방식과 코어 회로를 제안하였다. 그리고 blowing되지 않은 eFuse 링크가 EM (Electro-Migration) 현상에 의해 blowing되는 불량을 해결하기 위해 RWL (Read Word-Line) 구동 회로와 BL (Bit-Line) 풀-업 부하회로에 V2V ($=2V{\pm}0.2V$)의 regulation된 전압을 사용하였다. 설계된 32비트 eFuse OTP 메모리의 레이아웃 면적은 $228.525{\mu}m{\times}105.435{\mu}m$으로 기존의 셀 어레이 라우팅을 이용한 IP 크기인 $197.485{\mu}m{\times}153.715{\mu}m$ 보다 20.7% 더 작은 것을 확인하였다.
Pleurotus ostreatus균 전처리에 의한 볏짚의 상압 바이오 소다펄프화
박헌도 ( Heon Do Park ),강진하 ( Jin Ha Kang ) 전북대학교 농업과학기술연구소 2010 농업생명과학연구 Vol.41 No.2
This study was performed to develop the biochemical pulping method to save the energy and decrease the capital cost in soda pulping. Rice straw was pretreated by Pleurotus ostreatus with either, glucose(G), nitrogen(N) and G+N for 5, 10, 15, 20, 25 and 30 days incubation respectively because of its selective delignification capacity. The total yield of untreated rice straw pulp was 53.5%. In the case of fungal pretreatment, the total yields of pulps showed the ranges of 48.3~28.4%. Consequently, according to the extending of incubation periods, the total yields of pulps were gradually decreased. The Kappa number of pulp made from untreated rice straw was 22.8. In the case of fungal pretreatment, the Kappa numbers were ranges of 26.6~17.4. In case of control and G, the Kappa number were increased until 15 days and in case of N and G+N, also were increased until 20 days. Thereafter, the Kappa number were decreased. In addition, the brightness of pulp made from untreated rice straw was 34.2. In the case of the fungal pretreatment, the brightness of rice straw pulps showed ranges of 28.2~34.9. The brightness were decreased until 15 days, thereafter were increased. The physical properties of soda pulp made from rice straw without fungal treatment, the density, breaking length, burst index, tear index and folding endurance were 0.48g/cm3, 4.82km, 3.37kPa · m2/g, 19.1mN · m2/g and 110 times, respectively. On the other hand, in case of fungal pretreatment, the physical properties of pulps made from rice straw were as follows. The density was 0.50~0.58g/cm3, the breaking length was 4.46~7.18km, burst index was 2.95~5.30kPa·m2/g, tear index was 8.5~18.9mN·m2/g and folding endurance was 8~328 times according to the conditions of nutrients and incubation periods. As a result, if the rice straw would be pretreated with fungi, it is possible to use the condition of atmospheric pressure in soda pulping of rice straw for low grade papers. Accordingly, we can reduce the capital cost and energy consumption in pulp mills where are using the non-wood plants such as rice straw as raw materials.
요소-멜라민 공축합 수지의 요소와 멜라민 혼합비율이 합판의 포름알데히드 방출과 접착성에 미치는 영향
박헌,강은창,민경희,Park, Heon,Kang, Eun-Chang,Min, Kyeong-Heui 한국가구학회 2000 한국가구학회지 Vol.11 No.1
This study was to measure formaldehyde emission and bonding strength of plywoods manufactured with urea-melamine formaldehyde adhesives, which were made from three different mixing ratios of urea and melamine, and with four different formaldehyde/urea-melamine molar ratios of 1.0,1.1,1.2 and 1.4. The results were as follows 1. Amount of formaldehyde emission was the lowest at the first method of molar ratio(F/(M+U)) 1.0. Amounts of formaldehyde emission of experimental manufactured adhesives were lower than that of commercial adhesive. 2. Bonding strength of dry specimen was the highest at the first method of molar ratio(F/(M+U)) 1.4. Dry bonding strength of molar ratio(F/(M+U)) 1.4 was similar to commercial adhesive. 3. Bonding strength of wet specimen was the highest at the second method of molar ratio(F/(M+U)) 1.4. Bonding strength of wet specimen used by the third method of molar ratio(F/(M+U)) 1.4 was almost equal to commercial adhesive.