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A Study of Two Preservice Teachers’ Development of Covariational Reasoning
Jaehong Shin,이중권 한국학교수학회 2009 韓國學校數學會論文集 Vol.12 No.4
This article describes the interview data with two preservice teachers where they dealt with five water-filling problems for the investigation of their covariational thinking. The study’s results revealed that two students developed their covariation levels from Direction level to Instantaneous Rate with an aid of the pre-constructed GSP simulations for the problem situations. However, this study also points out that there is a missing important feature for a function notion, ‘causality’ in the covariation framework and suggests that future research should combine students’ conception of causality with their covariational thinking for the investigation of their development of a function concept.
Jaehong Shin,Daedong Kim,Hyun Jung Kim 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Horse oil contains more unsaturated fatty acids than saturated fatty acids, therefore lipid oxidation easily occurs. This study investigated the effectiveness of antioxidant to improve the oxidative stability of horse oil-in-water (HO/W) emulsions. The HO/W emulsion was prepared with the different concentrations of α-tocopherol and Trolox (0, 100, 200, and 500 μg/mL) during storage of 40 days at 25℃ in the dark. The mean particle size and zeta-potential values of HO/W emulsions were changed by the addition of α-tocopherol and Trolox at different concentration. Polydispersity index values and emulsion efficiency of HO/W emulsions were decreased in the α-tocopherol added emulsion during storage. For lipid oxidation, the levels of lipid hydroperoxide and TBARS in the HO/W emulsion were increased by α-tocopherol addition. The lipid oxidation progressed as the concentration of α-tocopherol increased from 100 to 500 μg/mL; however, the Trolox prevented the oxidation of HO/W emulsion. These results indicated that the oxidative stability of HO/W emulsions when added with Trolox were effectively improved compared to the α-tocopherol addition.
온라인 게임 서버를 위한 부하 분산 미들웨어의 구현에 대한 연구
신동일(Dongil Shin),신동규(Dongkyoo Shin),김민수(Minsoo Kim),장재홍(Jaehong Jang),윤현숙(Hyunsook Yoon),이정훈(Junghoon Lee),한창완(Changwan Han) 한국정보과학회 2000 한국정보과학회 학술발표논문집 Vol.27 No.2Ⅰ
오늘날 온라인 게임 TCP망을 이용하여 동시에 수백에서 수천명이 접속하여 게임을 즐길 수 있는 클라이언트/서버 모델의 표준이지만 서버에 접속하는 클라이언트의 수가 증가함에 따라 나타나는 많은 문제점을 가지고 있다. 본 논문에서는 기존 네트웍 게임 엔진의 구조적 단점을 보완한 3-tier 방식을 적용한 분산 네트웍 게임 서버를 위한 부하 분산기의 연구 및 개발에 대하여 서술한다. 이 시스템은 클라이언트/서버 모델의 2-tier방식에서 오는 클라이언트 수 증가에 따른 네트웍 부하 가중에 대한 처리 문제와, 분산된 2-tier방식을 적용한 서버에서 각 서버간의 통신, 데이터 공유에 대한 문제 등을 다루고 이에 대한 해결책으로 3-tier방식을 적용하여 클라이언트/서버사이에 각 서버의 사용자나 이동되는 데이터를 분산하고 모니터링하는 부하 분산기 시스템을 적용하여 위와 같은 문제점을 해결하였다.
Shin, Mi-Na,Kim, Jin-Won,Shim, Jaehong,Koo, Heung-Hoe,Lee, Jai-Young,Cho, Min,Oh, Byung-Taek 한국토양비료학회 2013 한국토양비료학회지 Vol.46 No.3
Livestock wastes are considered as major environmental pollutants because they contain high concentration of organic materials. In 2001, The Environmental Department reported that stock farmers were increasing as 5.1%/year, which resulted in a gradual increase in livestock wastes generation. The direct disposal of livestock wastes create several environmental problems. Thus, several countries banned the disposal of livestock wastes in environment including aquatic systems. Recently, aeration-based liquid fertilization was considered as potential way for the disposal of livestock wastes. In this study, next generation sequencing (NGS) analysis was used to understand the microbial community changes during liquid fertilization of livestock wastes. Microbial community was compared with liquid fertilizer physicochemical analysis such as $BOD_5$, $COD_{Mn}$ pH, N (Nitrogen), P (Phosphorus), K (Potassium) etc. The physicochemical parameters and bacterial community results pave the way for producing effective livestock-based fertilizer. By comparing the physical characteristics of the manure with microbial community changes, it is possible to optimize the conditions for producing effective fertilizer.
Application of Area-Saving RF Test Structure on Mobility Extraction
Jaehong Lee,Junsoo Kim,Byung-Gook Park,Jong Duk Lee,Hyungcheol Shin 대한전자공학회 2009 Journal of semiconductor technology and science Vol.9 No.2
An RF test structure is proposed and its applicability is confirmed by measuring DC characteristics and high frequency characteristics. Effective mobility extraction is also performed to confirm the validity of proposed test structure. The area of suggested test structure consumed on wafer was decreased by more than 50% and its characteristics do not be degraded compared with conventional structure.
Jaehong Kim,Dong-Sup Jin,Xianglan Jin,Jong-Seon No,Dong-Joon Shin IET 2015 IET COMMUNICATIONS Vol.9 No.10
<P>An interference alignment (IA) scheme for interference channels was recently proposed to achieve the maximum degrees of freedom (DoF). Although most studies of IA focus on network throughput, that is, DoF, reliability in terms of diversity order is also an important performance measure. In this study, interference cancellation (IC) scheme based on Alamouti code in the multi-access scenario is applied to the K-user, multi-input-multi-output (MIMO) interference channel. This IC scheme gives the benefit of diversity order and requires no channel-state-information at the transmitters (CSIT). However, it requires more receive antennas than the IA scheme to achieve the same DoF. In order to reduce the number of receive antennas, especially for the three-user MIMO interference channel, an IA-and-cancellation (IAC) scheme based on Alamouti code is proposed. It keeps the same DoF as the IC scheme, but requires partial CSIT. It is analytically shown that the IC and IAC schemes enable symbol-by-symbol decoding and achieve diversity order of two, while the conventional IA scheme achieves diversity order of one.</P>
Shin, Bok-Kyu,Kim, Mihyang,Han, Jaehong Elsevier 2017 Phytochemistry Vol.136 No.-
<P><B>Abstract</B></P> <P>(<I>E</I>)-4-Hydroxy-3-methylbut-2-enyl diphosphate (HMBPP) reductase (IspH, HDR or LytB) is an Fe/S enzyme catalyzing the reductive dehydroxylation of HMBPP to isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP) in the last step of methylerythritol phosphate (MEP) pathway. The MEP pathway is known to produce 4–6:1 ratio of IPP and DMAPP mixture by the last enzyme, IspH. Plant IspH in plastids follows same catalytic mechanism as others, but GbIspH (<I>Ginkgo biloba</I> IspH) was reported to produce a mixture of IPP and DMAPP in a ratio of 16:1. Present catalytic mechanisms of IspH involve a common allyl anion intermediate, and the intramolecular proton transfer to the allyl moiety is considered as the key reaction step determining the product between IPP and DMAPP. The F212 residue in plant IspH was found as a potential amino acid residue that could mediate the proton transfer to the allyl anion intermediate before the product release. In this report, catalytic function of GbIspH F212 residue (H74 in <I>E. coli</I>), especially during the product formation in the active site, was studied by means of site-directed mutation. The product ratio of IPP/DMAPP was measured as 6.5 ± 0.1 for F212H GbIspH, and the value was close to the reported bacterial IspH having His residue on that specific position. Along with the other F212Y mutant, of which ratio was determined as 10.9 ± 0.1, the results strongly support that the Phe residue in plant IspH is the key amino acid residue that allows exclusive production of IPP in plant chloroplast.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Biochemical mechanism of almost exclusive IPP production by GbIspH is proposed. </LI> <LI> IPP/DMAPP is 6.5 ± 0.1 for F212H GbIspH, and 10.9 ± 0.1 for F212Y GbHDR, respectively. </LI> <LI> F212 of GbIspH is the key residue altering the proton transfer to the allyl anion intermediate before the product release. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>