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진단사양 표준화 검증 및 진단프로그램 자동생성 시스템 개발
안현수(Hyunsoo Ahn),김성구(Sunggu Kim),손우혁(Woohyeok Son),이정희(Chunghi Lee),배현철(Hyuncheol Bae) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The main goal of standardization on diagnostic specification is to achieve the reusability of diagnostic program. Reusability is connected with the reliability and cost reduction including delivery time. DIMS was developed to attain these goals through reducing the efforts for standardization verification and coding works. The XML-based database structure and auto-generation method of DIMS enable these features. As a result, through DIMS, the reliable diagnostic program can be obtained cost-efficiently in an early stage.
MAEPER: Matching Access and Error Patterns With Error-Free Resource for Low Vcc L1 Cache
Younggeun Choi,Sungjoo Yoo,Sunggu Lee,Jung Ho Ahn,Kangmin Lee IEEE 2013 IEEE transactions on very large scale integration Vol.21 No.6
<P>Large SRAMs are the practical bottleneck to achieve a low supply voltage, because they suffer from process variation-induced bit errors at a low supply voltage. In this paper, we present an error-resilient cache architecture that resolves the drawback of previous approaches, i.e., the performance degradation at a low supply voltage which is caused by cache misses in accesses to faulty resources. We utilize cache access locality and error-free resources in a cost-effective manner. First, we classify cache lines into fully and partially accessed groups and apply appropriate methods to each group. For the partially accessed group, we propose a method of matching memory access behavior and error locations with intra-cache line word-level remapping. In order to reduce the area overhead used to store the cache access information history, we present an access pattern-learning line-fill buffer (LFB). For the fully accessed group, we propose the utilization of error-free assist functions in the cache, i.e., a LFB and victim cache with no process variation-induced error at the target minimum supply voltage. We also present an error-aware prefetch method that allows us to utilize the error-free victim cache to achieve a further reduction in cache misses due to faulty resources. Experimental results show that the proposed method gives an average 32.6% reduction in cycles per instruction at an error rate of 0.2% with a small area overhead of 8.2%.</P>
SATEEC 시스템을 이용한 객토 토양의 토성고려에 따른 도암댐 유역의 토양유실 및 유사량 분석
유동선 ( Dongsun Yoo ),안재훈 ( Jaehun Ahn ),윤정숙 ( Jongsuk Yoon ),허성구 ( Sunggu Heo ),박윤식 ( Younshik Park ),김종건 ( Jonggun Kim ),임경재 ( Kyoung Jae Lim ),김기성 ( Ki-sung Kim ) 한국농공학회 2007 한국농공학회 학술대회초록집 Vol.2007 No.-
There have been serious soil erosion and water pollution problems caused by highland agriculture practices at Doam-dam watershed. Especially agricultural activities, chemical and organic fertilizer and pesticide applications, soil reconditioning to maintain soil fertility are known as primary causes of soil erosion and water qaulity degradation in the receiving water bodies. Among these, soil reconditioning can accelerate soil erosion rates. To develop soil erosion prevention practices, it is necessary to first estimate the soil erosion from the watershed. Thus, the Universal Soil Loss Equation (USLE) model has been developed and utilized to assess soil erosion. However, the USLE model cannot be used at watershed scale because it does not consider sediment delivery ratio (SDR) for watershed application. For this reason, the Sediment Assessment Tool for Effective Erosion Control (SATEEC) was developed to assess the sediment yield at any point in the watershed. The USLE-based SATEEC system can estimate the SDR using area-based SDR and slope-based SDR module. In this study, the SATEEC system was used to estimate soil erosion and sediment yield at the Doam-dam watershed using the soil properties from reconditioned agricultural fields. Based on the soil sampling and analysis, the USLE K factor was calculated and used in the SATEEC system to analyze the possible errors of previous USLE application studies using soil properties from the digital soil map, compared with that using soil properties obtained in this study. The estimated soil erosion at the Doam-dam watershed without using soil properties obtained in the soil sampling and analysis is 1,791,400 ton/year (123 ton/ha/year), while the soil erosion amounts is 2,429,900 ton/year (166.8 ton/ha/year) with the use of soil properties from the soil sampling and analysis. There is 35% increases in estimated soil erosion and sediment yield with the use of soil properties from soil reconditioned agricultural fields. Since significant amounts of soil erosion are known to be occurring from the agricultural fields, the soil erosion and sediment yield from only agricultural fields was assessed. The soil erosion rate is 45.9 ton/ha/year without considering soil properties from soil reconditioned agricultural fields, while 105.3 ton/ha/year after considering soil properties obtained in this study, increased in 129%. This study shows it is very important to use correct soil properties to assess soil erosion and sediment yield simulation. It is recommended that further studies are needed to develop environment friendly soil reconditioning method should be developed and implemented to decrease the speed of soil erosion rates and water quality degradation.
이승백,임채현,Won-il Choi,Eun-Suk Choi,Kangwon Choi,Sunggu Ahn,Junhyuk Lee,Sung-Jin Choi,박봉현 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.4
We report on the toxic-gas-sensing characteristics of density-controlled carbon-nanotube-network (NTN) thin-film devices prepared on exible poly-dimethylsiloxane (PDMS) substrates. The devices were prepared by directly curing PDMS on selective vacuum-filtered NTN surfaces. The roomtemperature NH3 gas-sensing characteristics showed that for a 9-mm-channel-length device, a 40-s exposure to 10-ppm NH3 resulted in a 17 % decrease in conductance. Comparing devices with uniform square resistances and differing channel lengths showed that while having the same surface reaction rate (4.17 × 10-6 ppb-1·s-1) to NH3, the longer NTN showed a higher sensor response. This was attributed to the increased semiconducting behavior of the longer NTN channels. We also found that the sensitivity may be improved further by reducing the nanotube density, which reduces the probability of forming metallic nanotube paths between the contacts.
Epidural Electrotherapy for Epilepsy
Hyerin JEONG,Sung-Won PARK,Jejung KIM,Minpyo KANG,Wonho LEE,Byong Seo KIM,Hansung KIM,Se-Young CHOI,Sungchil YANG,Jong-Hyun AHN,Sunggu YANG 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Penetrating electronics have been used for treating epilepsy, yet their therapeutic effects are debated largely due to the lack of a large-scale, real-time, and safe recording/stimulation. Here, the proposed technology integrates ultrathin epidural electronics into an electrocorticography array, therein simultaneously sampling brain signals in a large area for diagnostic purposes and delivering electrical pulses for treatment. The system is empirically tested to record the ictal-like activities of the thalamocortical network in vitro and in vivo using th epidural electronics. Also, it is newly demonstrated that the electronics selectively diminish epileptiform activities, but not normal signal transduction, in live animals. It is proposed that this technology heralds a new generation of diagnostic and therapeutic brain-machine interfaces. Such an electronic system can be applicable for several brain diseases such as tinnitus, Parkinson’s disease, Huntington’s disease, depression, and schizophrenia.