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A Multi-Level Accumulation-Based Rectification Method and Its Circuit Implementation
( Hyeon-sik Son ),( Byungin Moon ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.6
Rectification is an essential procedure for simplifying the disparity extraction of stereo matching algorithms by removing vertical mismatches between left and right images. To support real-time stereo matching, studies have introduced several look-up table (LUT)- and computational logic (CL)-based rectification approaches. However, to support high-resolution images, the LUT-based approach requires considerable memory resources, and the CL-based approach requires numerous hardware resources for its circuit implementation. Thus, this paper proposes a multi-level accumulation-based rectification method as a simple CL-based method and its circuit implementation. The proposed method, which includes distortion correction, reduces addition operations by 29%, and removes multiplication operations by replacing the complex matrix computations and high-degree polynomial calculations of the conventional rectification with simple multi-level accumulations. The proposed rectification circuit can rectify 1,280 × 720 stereo images at a frame rate of 135 fps at a clock frequency of 125 MHz. Because the circuit is fully pipelined, it continuously generates a pair of left and right rectified pixels every cycle after 13-cycle latency plus initial image buffering time. Experimental results show that the proposed method requires significantly fewer hardware resources than the conventional method while the differences between the results of the proposed and conventional full rectifications are negligible.
계통 전압 강하에 따른 저전압 상황에서 계통 위상 추정을 위한 PLL 방법
손현수(Hyeon-Su Son),양세동(Se-Dong Yang),김가인(Ga-In Kim),강현식(Hyeon-Sik Kang),신민호(Min-Ho Shin),김미나(Mi-Na Kim),이정효(Jung-Hyo Lee) 한국조명·전기설비학회 2021 한국조명·전기설비학회 학술대회논문집 Vol.2021 No.11
This paper describes estimating grid phase angle using improved PLL method for low voltage condition according to a grid voltage drop. A reactive power injection is required at situation of a low voltage accident in the interconnecting Distributed Generation System to the grid or a grid voltage drop by recent an electric vehicle charger, and the grid phase angle is required to obtain accurate a dq-transformed reference of voltage and current. In the method of estimating the grid phase, it is difficult to accurately estimate the grid phase in a low voltage condition when using only the existing voltage information.
( Hyeon Joo Ham ),( In Jun Yeo ),( Seong Hee Jeon ),( Jun Hyung Lim ),( Sung Sik Yoo ),( Dong Ju Son ),( Sung-su Jang ),( Haksup Lee ),( Seung-jin Shin ),( Sang Bae Han ),( Jae Suk Yun ),( Jin Tae Hon 한국응용약물학회 2022 Biomolecules & Therapeutics(구 응용약물학회지) Vol.30 No.1
Recently, increasing evidence suggests that neuroinflammation may be a critical factor in the development of Parkinson’s disease (PD) in addition to the ratio of acetylcholine/dopamine because dopaminergic neurons are particularly vulnerable to inflammatory attack. In this study, we investigated whether botulinum neurotoxin A (BoNT-A) was effective for the treatment of PD through its anti-neuroinflammatory effects and the modulation of acetylcholine and dopamine release. We found that BoNT-A ameliorated MPTP and 6-OHDA-induced PD progression, reduced acetylcholine release, levels of IL-1β, IL-6 and TNF-α as well as GFAP expression, but enhanced dopamine release and tyrosine hydroxylase expression. These results indicated that BoNT-A had beneficial effects on MPTP or 6-OHDA-induced PD-like behavior impairments via its anti-neuroinflammation properties, recovering dopamine, and reducing acetylcholine release.
손현식,Son, Hyeon-Sik 사단법인 한국당뇨협회 2006 당뇨 Vol.194 No.-
뇌졸증 예방을 위해서는 대부분의 당뇨병환자에서 혈당조절 이외에 동반된 여러 위험인자들을 같이 교정해주는 것이 중요하다. 또한 환자에게 당뇨병이 뇌졸증의 위험인자임을 인식하도록하고 이에 상응하는 증상이 발생할 경우에는 적절한 시간 내에 병원을 방문하여 검사를 받도록 하여야 한다.
주재식(Jae Sik Ju),손문호(Moonho Son),조현서(Hyeon-Seo Cho),김평중(Pyoung-Joong Kim) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.12
시화호 표층퇴적물 중 지구화학적 특성과 미량금속의 오염도 평가를 위해 입도, 강열감량(IL), 화학적산소요구량(COD) 및 미량금속(As, Pb, Cd, Cu, Cr, Zn, Ni, Mn, Hg, Fe, Li)을 분석 하였다. 시화호 표층퇴적물의 평균입도는 2.94~6.35Ø 의 범위로 분포하였으며, 퇴적상은 전반적으로 sandy silt(sZ)를 나타내었고, 이러한 표층퇴적물의 성상은 유기물 및 미량금속의 농도와 상관관계를 나타내었다 (p<0.05). 특히, 표층퇴적물 중 As, Pb, Cd, Cu, Cr, Zn, Fe, Hg은 평균입도와 상관성을 보일 뿐만 아니라, IL(Ignition Loss)과도 높은 상관성을 보여 이들 원소의 농도가 입도와 유기물의 영향을 받고 있는 것으로 나타났다. 이에 시화호의 표층퇴적물 관리에 있어서 미량금속의 유입 뿐 만 아니라 유기물의 유입을 병행하여 조사되어야 할 것으로 판단되었다. 오염도 평가에 있어서 표층퇴적물 중 미량금속 함량의 농축계수와 농집지수는 대부분 약간 오염된 상태를 나타낸 가운데, As의 경우 농축계수와 농집지수 가 오염된 상태를 보였다. 이는 특정 중금속에 의한 농축이 여전히 해결되지 않은 것으로 나타나, 이를 해결할 수 있는 방안마련이 시급할 것으로 사료되었다. 아울러 비교적 공단지역 및 배수갑문에 근접한 지역은 오염도가 높은 반면, 시화호 중앙부분은 오염도가 낮은 경향을 보여, 지역적 편차를 고려한 지속적인 모니터링시 이 필요할 것으로 판단되었다. The purpose of this study was to understand the pollution level of the surface sediment of Sihwa Lake by assessing its geochemical characteristics and investigating the spatial distribution of trace metals and organic matter. In the surface sediment of Sihwa lake, the mean grain size was between 2.94 and 6.35 Ø and the main type of sediment was sandy silt. The concentrations of As, Co, Cr, Ni, V and Li among the metal elements in the surface sediment were correlated with the mean crust concentration (p<0.05). Based on the strong correlation between the metals (Cd, Cu, Pb and Zn) and organic matter (Ignition Loss), the concentrations of these metal elements seem to be controlled by the organic matter dilution effect. The trace metal pollution level, determined by applying the Republic of Korea Marine environmental standard and the US National Oceanic and Atmospheric Administration"s sediment quality guidelines, showed the pollution level of As to be either close to or in excess of the above-mentioned standards at almost all levels. The enrichment factor and geoaccumulation index of As showed that there was an incremental increase of pollution by elements other than V, Cr, Co, Fe, Al and Mn. Moreover, the nearby industrial area and dike were more polluted than the other areas, so the surface sediments in Sihwa lake should be monitored by taking into consideration the geological variations.
Mucor Rouxii 가 생산한 Chitin deacetylase 의 특성
손흥식(Heung Sik Sohn),박성민(Seong Min Park),손병일(Byung Yil Son),최현미(Hyeon Mee Choi),이근태(Keun Tai Lee) 한국수산과학회 1999 한국수산과학회지 Vol.32 No.2
In order to degrade chitin by enzymatic hydrolysis, it is required from screening highly active deacetylase. To this end, we examined three fungal strains and it turned out that Mucor rouxii produced highly active deacetylase, this enzyme exhibited the highest enzymatic activity against colloidal chitin. The conditions for growing Mucor rouxii are as follows ; the effective carbon source, nitrogen source, adequate initial pH, temperature and incubation time were 2% glucose, 1.33% yeast extract, 0.66% pepton, 4.5, 25±2℃ and 48 hr, respectively. The optimum pH and temperature for purified enzyme activity were 5.5 and 40%, respectively. The purified enzyme was stable at pH ranging from 4.5 to 5.5. However, the enzyme activity was decreased to less than 50% at pH below 4.5 and above 7.5. At temperatures above 50%, the enzyme activity was decreased remarkably. The enzyme was inhibited by LiCl, HgCl₂, and BaCl₂ but stimulated by CaCl₂ and ZnCl₂. The activity of purified enzyme was increased by 2-cysteine and mercaptoethanol, while decreased by o-phenanthrotine, p-CMB, EDTA, and iodoacetate. The K_m and the V_(max) value of purified enzyme were 1.2% and 59.5 U/㎎, respectively. The deacetylation activity of purified enzyme was not detected at optimal reaction condition when chitin particle suspension was used.