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탄소나노튜브 전극을 이용한 플렉시블 반사형 디스플레이의 구동 특성
황인성,김영조,Hwang, In-Sung,Kim, Young-Cho 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.6
To compare an electrical and optical characteristics of indium tin oxide (ITO) and carbon nanotube (CNT) electrode on flexible and reflective display, we fabricate two charged particle-type display panels under the same panel condition of which the width of ribs is 10 ${\mu}m$, the cell size is $300{\mu}m{\times}300{\mu}m$, the q/m value of the white particles is -4.3 ${\mu}C/g$ and that for the black is +1.3 ${\mu}C/g$, and the cell gap is 75 ${\mu}m$, 125 ${\mu}m$, and 175 ${\mu}m$. We use plastic substrates coated with ITO and CNT electrode. To evaluate optical property, we measure a response time of particles using a laser and a photodiode. Threshold and driving voltages of CNT electrode according to the sheet resistance of 300, 600, 1,000 (ohm/sq) are compared with ITO electrode of 10 (ohm/sq). A response time of the CNT panel is similar to that of ITO panel, but the threshold and driving voltages of CNT panel are higher than that of ITO panel, inducing a large bombardment of the particles and shortening the lifetime of the panel. High difference of a threshold and a driving voltage of CNT panel will induce an particle clumping, resulting degradation of the panel. A bending radius of the fabricated CNT panel is 18 ${\mu}m$.
국내 담수퇴적물의 CODsed 분석방법 평가: CODMn법과 CODCr법의 신뢰성 및 상관성 비교
최지연 ( Ji Yeon Choi ),오상화 ( Sang Hwa Oh ),박정훈 ( Jeong Hun Park ),황인성 ( In Seong Hwang ),오정은 ( Jeong Eun Oh ),허진 ( Jin Hur ),신현상 ( Hyun Sang Shin ),허인애 ( In Ae Huh ),김영훈 ( Young Hoon Kim ),신원식 ( Won Sik 한국환경과학회 2014 한국환경과학회지 Vol.23 No.2
In Korea, the chemical oxygen demand(COD(sed)) in freshwater sediments has been measured by the potassium permanganate method used for marine sediment because of the absence of authorized analytical method. However, this method has not been fully verified for the freshwater sediment. Therefore, the use or modification of the potassium permanganate method or the development of the new COD(sed) analytical method may be necessary. In this study, two modified COD(sed) analytical methods such as the modified potassium permanganate method for COD(Mn) and the modified closed reflux method using potassium dichromate for COD(Cr) were compared. In the preliminary experiment to estimate the capability of the two oxidants for glucose oxidation, COD(Mn) and COD(Cr) were about 70% and 100% of theoretical oxygen demand(ThOD), respectively, indicating that COD(Cr) was very close to the ThOD. The effective titration ranges in COD(Mn) and COD(Cr) were 3.2 to 7.5 mL and 1.0 to 5.0 mL for glucose, 4.3 to 7.5 mL and 1.4 to 4.3 mL for lake sediment, and 2.5 to 5.8 mL and 3.6 to 4.5 mL for river sediment, respectively, within 10% errors. For estimating COD(sed) recovery(%) in glucose-spiked sediment after aging for 1 day, the mass balances of the COD(Mn) and COD(Cr) among glucose, sediments and glucose-spiked sediments were compared. The recoveries of COD(Mn) and COD(Cr) were 78% and 78% in glucose-spiked river sediments, 91% and 86% in glucose-spiked lake sediments, 97% and 104% in glucose-spiked sand, and 134% and 107% in glucose-spiked clay, respectively. In conclusion, both methods have high confidence levels in terms of analytical methodology but show significant different COD(sed) concentrations due to difference in the oxidation powers of the oxidants.
낙동강 하천 및 호소 퇴적물에서의 PAHS, OCPS, Co-PCBs 농도 분포와 발생원 펑가
강희형(Hee Hyung Kang),이인석(In Seok Lee),허인애(In Ae Huh),신원식(Won Sik Shin),황인성(In Sung Hwang),김영훈(Young Hoon Kim),허진(Jin Hur),신현상(Hyun Sang Shin),김준하(Joon Ha Kim),오정은(Jeong Eun Oh) 大韓環境工學會 2010 대한환경공학회지 Vol.32 No.7
본 연구에서는 낙동강 수계 내 하천 및 호소의 퇴적물을 대상으로 16종의 다환방향족탄화수소(PAHs), 다염화바이페닐(PCBs), 유기염소계 농약(OCPs)류를 분석하였다. 하천 퇴적물에 존재하는 16종의 PAHs와 12종의 Co-PCBs 농도 수준은 각각 N.D.~969.3ng/g-dry, 4.2~7716.5pg/g-dry(0.0~10.1 pg-TEQ/g-dry)이었다. 호소 퇴적물에 존재하는 16종의 PAHs류는 5.8∼2987.2ng/g-dry, 12종의 co-PCBs는 4.3~461.1 Pg/g-dry(0.0~0.6 pg-TEQ/g-dry), OCPs의 농도 수준은 N.D.~1.5ng/g-dry이었으며, OCPs 중 DDT류만 검출되었다. 이는 환경질 평가를 위한 가이드 라인보다 훨씬 낮은 수준이었다. 낙동강 수계 내 하천 퇴적물에 존재하는 16종의 PAHs 중 저분자 PAHs의 비율이 높은 반면, 호소에서는 중·고분자 PAHs의 비율이 높았다. 그리고 PCBs는 모든 퇴적물 시료에서 PCB-118과 PCB-105의 비율이 가장 높게 나타났으며, 이는 이전의 연구와도 일치하는 결과이다. 검출 된 PAHs와 Co-PCBs의 배출원 추정 결과,PAHs의 경우 일부 지점들을 제외한 대부분의 지점들이 석탄 및 바이오패스의 연소 와 관련 있었으며, Co-PCBs의 경우 상업적인 PCBs와 관련이 있음을 알 수 있었다. We investigated the levels and distribution patterns of 16 priority polycyclic aromatic hydrocarbons (PAHs), 12 Coplanar polychlorinated biphenyls (Co-PCBs) and organochlorine pesticides (OCPs) in the surface sediments from the Nakdong river basin, Korea. The levels of 16 PAHs and 12 Co-PCBs in the river sediment samples ranged from not detected (N.D.)~969.3ng/g-dry, 4.2~7716.5pg/g-dry (0.0~10.1pg-TEQ/g-dry), respectively. Also, the levels of 16 PAHs were from 5.8~2987.2ng/g-dry and 4.3~461.1pg/g-dry (0.0~0.6 pg-TEQ/g-dry) for 12 Co-PCBs in the lake sediment samples. Only dichloro-diphenyl-trichloroethane (DDT) were detected among target OCPs and the concentration ranged from N.D.~1.5ng/g-dry in the river sediment samples. These contamination levels were far below the guideline values suggested for environmental quality assessment. Low molecular weight PAHs were dominant in the river sediment samples, while middle and high molecular weight PAHs were dominant among 16 PAHs in the lake sediment samples. PCB-118 and PCB-105 were predominant congeners in the sediment, which were similar to the results obtained from previous studies. With these results, the assessment of potential sources of PAHs and Co-PCBs contamination in the sediments of the Nakdong river basin was performed. The pyrogenic-PAHs originated from combustion of fossil fuel and biomass were related with the PAHs contribution in most of the sediment samples, and Co-PCBs in the sediment samples were related with commercial PCB products.
최원식(Won Sik Choy),이광원(Kwang Won Lee),황인성(In Sung Hwang),김하용(Ha Yong Kim),한태일(Tae Il Han) 대한슬관절학회 1999 대한슬관절학회지 Vol.11 No.1
The purpose of this study is to determine whether magnetic resonance imaging(MRI) can assist in deci- sion-making in the treatment of acute posterolateral complex injuries. We reviewed retrospectively seven patients with acute posterolateral complex injury, among the 79 cases that had taken cruciate ligament recon- struction. MRI findings were then correlated with the results of examination under anesthesia or operi lateral reconstruction. Based on surgical and clinical findings, there were six complete and four partial posterolateral complex injuries. MRI was able to accurately describe the extent of injury in each case. All ten patients had concomitant anterior cruciate ligament tears, and seven were three posterior cruciate ligament injuries. The iliotibial band was avulsed from Gerdys tubercle in seven patients. In knees with complete tears, separation of the coronary ligament of the lateral meniscus was noted on MRI. A characteristic bone contusion on the anteromedial femoral condyle was present in nine patients. Popliteal tendon tearing was observed in eight cases, and biceps femoris was torn in six patients. In knee with complete tears, tears of the lateral collateral ligament complex was noted both on MRI and intraoperatively. A high-quality MRI in patients sustaining these injuries will assist the surgeon in directly applying surgical techniques in a timely fashion.
도심형 실버타운 내 주거공간에서의 감성디자인 적용방법에 관한 연구
김재용(Kim, Jae-Yong),김은영(Kim, Eun-Young),황인성(Hwang, In-Sung),황연숙(Hwang, Yeon-Sook) 한국실내디자인학회 2011 한국실내디자인학회 학술대회논문집 Vol.13 No.3
In this moment, our country is exposed to lots of problem, caused by rapid increase in aging population. Because of enhancing economic ability and the changes in public attitudes, current old people are turning into the independent class that can do their own activity. However, elderly care facilities established in these social movements are developed without the consideration of elderly characteristics. If this situation goes on, elderly’s physical atrophy will cause the social problems like feeling left-out, or sense of losing their roles. Especially in their residential space, where they spend most of their time, the emotional support considering elders" characteristics is required essentially. Therefore, we studied to maintain the elderly’s sociality by providing physical, and emotional stability, based on the fundamental understanding of functionality and safety in elders" residential space. Furthermore, we tried to find more effective design strategies, which could be adapted to elderly care facilities by analysing the emotional design elements.
4-Way 캐쉬의 선택된 Element를 이용한 향상된 동적 분기 예측기 구현
황인성(In-sung Hwang),황선영(Sun-young Hwang) 한국통신학회 2013 韓國通信學會論文誌 Vol.38 No.12(통신이론)
본 논문은 4-Way 캐쉬의 선택된 element만을 사용하여 어플리케이션 수행 사이클을 줄인 향상된 동적 분기 예측기를 제안한다. 제안된 동적 분기 예측기는 분기명령어가 페치되면 MRU 버퍼를 참조하여 4-Way 캐쉬의 선택된 element에서 타깃 주소를 얻으므로, 모든 element에 접근하는 기존의 동적 분기 예측기보다 제한된 전력하에서 BTAC entry 수를 증가시킬 수 있어 분기 예측 성공률과 어플리케이션의 수행속도가 상당히 향상된다. 제안된 동적 분기 예측기의 효율성을 SMDL 시스템에 의해 생성된 코어가 벤치마크 어플리케이션을 수행하여 검증한다. 실험결과 동적 분기 예측기가 없는 코어에 비해 생성된 코어의 어플리케이션 수행 사이클은 평균 10.1% 감소하고 어플리케이션의 전력소모는 7.4% 증가한다. 기존 동적 분기 예측기를 사용하는 코어에 비해 수행 사이클은 평균 4.1% 줄어든다. This paper proposes an improved branch predictor that reduces the number execution cycles of applications by selectively accessing a specific element in 4-way associative cache. When a branch instruction is fetched, the proposed branch predictor acquires a branch target address from the selected element in the cache by referring to MRU buffer. Branch prediction rate and application execution speed are considerably improved by increasing the number of BTAC entries in restricted power condition, when compared with that of previous branch predictor which accesses all elements. The effectiveness of the proposed dynamic branch predictor is verified by executing benchmark applications on the core simulator. Experimental results show that number of execution cycles decreases by an average of 10.1%, while power consumption increases an average of 7.4%, when compared to that of a core without a dynamic branch predictor. Execution cycles are reduced by 4.1% in comparison with a core which employs previous dynamic branch predictor.
주거공간에서의 화재경보음 특성에 따른 전달감쇠 실험연구
이민주(Lee Min-Joo),심형보(Shim Hyoung-Bo),황인성(Hwang In-Sung),김명준(Kim Myung-Jun) 한국건축친환경설비학회 2008 한국건축친환경설비학회 학술발표대회 논문집 Vol.- No.-
In fire emergencies, the audible fire alarm sounds are very important in saving the building occupant's life. The improved sound insulation of buildings, however, has made it more difficult for the occupants to alert and to recognize the fire alarm sound when the fire alarm sounder system works. This study aims to measure and compare the fire alarm sound pressure level by various alarm signals in four apartment buildings. Two types of measurements were conducted and a total of six alarm signals were used: a transnational fire bell, a buzzer, a reverse alarm, a slow whoop, a T-3, and a white noise source. The results showed that the T-3 signal was the best source in terms of less sound attenuation between the source room (living room) and the receiving room (bedroom).