Li(Ni_1-x-yCo_xMn_y)O₂계 이차전지 공정 스크랩으로부터 회수한 전이금속을 활용한 리튬이차전지 양극재 제조

이재원,김대원,장성태,Lee, Jae-Won,Kim, Dae Weon,Jang, Seong Tae 한국분말야금학회 2014 한국분말재료학회지 (KPMI) Vol.21 No.2

Cathode materials and their precursors are prepared with transition metal solutions recycled from the the waste lithium-ion batteries containing NCM (nickel-cobalt-manganese) cathodes by a $H_2$ and C-reduction process. The recycled transition metal sulfate solutions are used in a co-precipitation process in a CSTR reactor to obtain the transition metal hydroxide. The NCM cathode materials (Ni:Mn:Co=5:3:2) are prepared from the transition metal hydroxide by calcining with lithium carbonate. X-ray diffraction and scanning electron microscopy analyses show that the cathode material has a layered structure and particle size of about 10 ${\mu}m$. The cathode materials also exhibited a capacity of about 160 mAh/g with a retention rate of 93~96% after 100 cycles.

초등학교 학생에서 주의력결핍-과잉행동 증상과 인터넷 게임 사용의 관련성에 관한 종단적 연구

이재원(Jae Weon Lee),최현우(Hyun Woo Choi),이경규(Kyung-Kyu Lee),백기청(Ki Chung Paik),김경민(Kyoung Min Kim) 한국중독정신의학회 2018 중독정신의학 Vol.22 No.2

Objectives : The present study aimed to investigate the associations between the symptoms of Attention Deficit/Hyperactivity Disorder (ADHD) and internet gaming based on a longitudinal study design. Methods : Typically, 456 children participated in the study when they were in 1st grade in elementary school. The participants were assessed with questionnaires about the gaming hours, ADHD rating scale (K-ARS), Korean Young Internet Addiction Scale (KYS; self-rating scale) and Internet Addiction Proneness Scale for Youth (K-scale ; parent-rating scale). Among the total participants in the study, 374 and 233 children were assessed at the 2nd and 5th grade, respectively. Results : The total gaming hours increased with age in both the sexes. Although it was not significant, children with gaming time less than 1 hour at 2nd and 5th grade tended to show lower K-ARS score at 1st grade than the other groups. The groups whose gaming time decreased between the 2nd and 5th grade showed a significant decrease in KARS score between 1st and 5th grade. Conclusion : The findings of this study indicate that the ADHD symptoms are the risk factors for internet gaming addiction and internet gaming might contribute to the aggravation of ADHD symptoms.

바이오에탄올 생산을 위한 바이오매스 자원으로서 버섯골목의 이용 가능성 평가

이재원(Lee, Jae-Won),구본욱(Koo, Bon-Wook),최준원(Choi, Joon-Weon),최돈하(Choi, Don-Ha),최인규(Choi, In-Gyu) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06

In order to investigate the possibility of waste mushroom logs as biomass resource chemical and physical characteristics of normal woods and waste mushroom logs such as crystallinity value, energy consumption, total sugar yield after hydrolysis chemical compounds and molecular weight distribution after acid hydrolysis, were examined. In the results, crystallinity of waste mushroom logs which were three year passed after the inoculation was decreased drastically from 49% to 33% during the cultivation. Lignin contents as chemical compounds of normal woods and waste mushroom logs were 21.07% and 18.78%, respectively. By the results of measurement of energy consumption, the size reduction of normal woods required a significantly higher energy than that of waste mushroom logs. In the hydrolysis, total sugar yield by enzyme and acid hydrolysis were high in waste mushroom logs(53% 57.5%) than in normal woods(42.9%, 47.17%). According to the molecular weight distribution using GPC, low molecular weight compounds were distributed in waste mushroom logs. Based on these results, waste mushroom logs have enough potential as material for developing alternative energy because of easily conversion to sugar by various hydrolysis methods and requirement of low energy consumption during size reduction.

섭동론에 의한 간단한 쿨롱 액체의 구조 및 열역학적 성질

신동영,이재원,이태규,Shin Dong Young,Lee Jae Weon,Ree T.,Ree Francis H. 대한화학회 1991 대한화학회지 Vol.35 No.4

단순한 쿨롱액체들의 채심입방정계의 구조와 열역학적 성질들은 일성분 플라즈마에 대한 섭동론으로부터 계산된다. 섭동론(PT)과 Monte Cario(MC) 데이타의 비교는 좋은 일치를 보인다. 강체구 섭동론은 일성분 플라즈마 같은 먼 거리의 인력계에 적절하다. PT와 MC 데이타에 대한 동경 분포함수(g(r))와 구조인자(S(q))의 비교에서 일치를 보인다. 따라서 섭동론은 쿨롱액체의 성질 및 구조를 설명하는데 유용한 방법이다. The structure and thermodynamic properties of body centered cubic structure of simple Coulombic liquids are computed from the perturbation theory for one-component plasma. A comparison of perturbation theory (PT) and Monte Carlo (MC) simulation shows excellent agreement. The hardsphere perturbation theory is applicable to a long-range attractive system, such as the one-component plasma. A comparison of the radial distribution function (g(r)) and the structure factor (S(q)) for PT data and MC data shows agreement. Thus the perturbation theory is an applicable method to explain the structure and thermodynamic properties of Coulomb liquids.

$Hg^{2+}$이온 水溶液 內에서의 Chloropentaamminecobalt(III)의 置換反應速度와 메카니즘 (제 1 보)

박병각,이재원,임주상,Byung-Kak Park,Jae-Weon Lee,Joo-Sang Lim 대한화학회 1986 대한화학회지 Vol.30 No.3

Chloropentaamminecobalt(III)의 $Cl^-$리간드와 물 分子의 置換反應에서 H$g^{2+}$ 이온 觸媒의 역할을 알기 위하여 UV分光法으로 速度論的 硏究를 하였다. 觸媒촉매가 一次일차 反應반응形式형식으로 反應반응에 관여함을 알았으며, 觸媒촉매를 考慮 했을때의 速度常數 $k_{obs}$는 3.366$l{\cdot}mol^{-1}sec^{-1}$의 값을 얻었다. 아울러 總括反應은 二次反應 임을 알았으며, $S_N2$ 反應機構로 進行되는 反應 메카니즘을 提案하였다. Kinetic studies were carried out for the substitution of $H-2$O for $Cl^-$ ligand of chloropentaamminecobalt(III) in the presence of $Hg^{2+}$ catalyst by UV spectrophotometer. It has been found that $Hg^{2+}$ ion appears first order dependence and the overall reaction is second order. The reaction system can be believed to occur via $S_N2$ reaction, because the calculated rate equation for our presumed $S_N2$ mechanism is in agreement with the observed one.

$Hg^{2+}$수용액에서 $cis-[Co(en)_2(NH_3)Cl]^{2+}$의 아쿠아반응에 대한 속도론적 연구

박병각,이길준,이재원,임주상,Byung-Kak Park,Gil-Jun Lee,Jae-Weon Lee,Joo-Sang Lim 대한화학회 1988 대한화학회지 Vol.32 No.3

$Hg^{2+}$촉매 존재하에서 cis-amminechlorobis(ethylenediamine)cobalt(III)의 Cl이 $H_2O$로 치환되는 반응을 전자흡수 스펙트라로 속도론적 연구를 하였다. 그 결과 $cis-[Co(en)_2(NH_3)Cl]^{2+}$에 대해서 각각 1차인 총괄반응이 2차반응이다. 활성화 파라메타인 ${\Delta}H^{\neq}$와 ${\Delta}S^{\neq}$는 각각 12.9 kcal/mol, -19.3 e.u 이고 $Hg^{2+}$에 의한 반응속도상수는 $1.65{\times}10^{-2}l/mol.sec$가 됨을 알았다. 이러한 속도 자료로부터 본 반응계의 Cl이 $H_2O$로 치환되는 반응은 촉매인 $Hg^{2+}$가 관여하는 Id 메카니즘을 제안하였다. A kinetic study was made to determine the mechanism of the aquation of $cis-[Co(en)_2(NH_3)Cl]^{2+}\;in\;Hg^{2+}$ aqueous solution. The progress of reaction was followed UV/vis-spectrophotometrically by a measurement of the absorbance at a specific wave length (530nm) of $cis-[Co(en)_2(NH_3)Cl]^{2+}$ as a function of time. The experimental results have shown that the reaction rate is dependent upon the concentration of $Hg^{2+}$ that act as a catalyst. And it was found that the overall reaction proceed with second order, first order with respect to Co(III) complex and $Hg^{2+}$. Activation parameters, ${\Delta}H^{\neq}\;and\;{\Delta}S^{\neq}$, were obtained as 12.9 kcal/mol and -19.3 e.u., respectively. We have proposed a plausible reaction mechanism which is consistent with the observed rate equation.

폐리튬이차전지 스크랩 재활용을 통한 양극활물질 전구체 합성 연구

김보람,김대원,김태헌,이재원,정항철,한덕현,정수훈,양대훈,Kim, BoRam,Kim, Dae-Weon,Kim, Tae-heon,Lee, Jae-Won,Jung, Hang-chul,Han, Deokhyun,Jung, Soo-Hoon,Yang, Dae-Hoon 한국결정성장학회 2022 한국결정성장학회지 Vol.32 No.2

A metal salt solution was prepared from valuable metals (Ni, Co, Mn) recovered from a scrap of waste lithium secondary batteries, and an NCM811 precursor was synthesized from the solution. The effect on precursor formation according to reaction time was confirmed by SEM, PSA, and ICP analysis. Based on the analysis results, the electrochemical properties of the synthesized NCM811 precursor and the commercial NCM811 precursor were investigated. The Galvano charge-discharge cycle, rate performance, and Cycle performance were compared, and as a result, there was no significant difference from commercial precursors.

장관골의 감염된 불유합의 치료 및 고찰

김근우(Keun Woo Kim),이재원(Jae Weon Lee),안길영(Kil Yeong Ahn) 대한정형외과학회 1989 대한정형외과학회지 Vol.24 No.3

초임계수를 이용한 표고버섯 골목의 가수분해

구본욱 ( Bon Wook Koo ),이재원 ( Jae Won Lee ),최준원 ( Joon Weon Choi ),최돈하 ( Don Ha Choi ),최인규 ( In Gyu Choi ) 한국목재공학회 2006 목재공학 Vol.34 No.6

8-hydroxyguanine이 전립선비대증 발생에 미치는 효과

이재원,이석영,이형래,이상철,김용태,김원재 충북대학교 의학연구소 2002 忠北醫大學術誌 Vol.12 No.2

연구목적: 전립선비대증은 노화현상에 의해 발생하는 질환으로서 임상적으로 주로 50세 이상에서 증상이 나타난다. 산소 라디칼은 DNA의 염기에 다양한 손상을 미칠 수 있다. 산소 라디칼에 의한 DNA의 변화에는 여러 가지 형태가 있으며 이러한 변화들 가운데서 guanine이 8-oxoguanine (8-hydroxyguanine, oh8Gua)으로의 수산화(hydroxylation) 반응은 가장 흔히 관찰되는 형태로서 노화 및 만성 퇴행성 질환, 기타 여러 질환의 중요한 병인으로 인식되고 있다. 세포에 유해한 영향을 주는 oh8Gua의 생성으로부터 유전자를 보호하는 수복효소 중 8-oxoguanine-DNA glycosylase (OGG1)가 주된 역할을 하는 것으로 알려져 있는데 이 효소를 생산하는 유전자인 hOGG1은 사람마다 유전자형이 다르다. 따라서 본 연구에서는 전립선비대증이 노화와 관련된 hOGG1 유전자형에 따라서 발생에 차이가 있는지를 조사하였다. 대상 및 방법: 충북대학교 병원에서 전립선비대증으로 진단 받고 입원하여 경요도전립선절제술을 받은 환자로 병리 조직학적으로 전립선비대증이 확인된 81명을 환자군으로 하였으며, 충청북도내 10개 군에서 50세 이상의 건강한 성인 남자 764명을 대상으로 실시한 전립선 무료검진에서 경직장 초음파 검사상 전립선 크기 20 gm 이하, 국제 전립선 증상 점수(IPSS) 7점 이하, 요속 10 ㎖/s 이상, 전립선 특이 항원(PSA) 4.0 ng/㎖ 이하인 81명을 대조군으로 설정하였다. 이들에서 채취한 혈액에서 genomic DNA를 얻은 후 PCR-SSCP (polymerase chain reaction-single stranded conformation polymorphism), 직접 염기서열분석(direct DNA sequencing) 및 RFLP (restriction fragment length polymorphism)를 통해서 두 군 사이의 hOGG1 유전자의 다형성을 분석하였다. 결과: 대조군에서 codon 326형은 Ser326Ser형이 12례(14.8%), Ser326Cys형이 51례(63.0%), Cys326Cys형이 18례(22.2%)였으며 전립선비대증 환자군에서는 Ser326Ser형이 15례(18.5%), Ser326Cys형이 34례(42.0%), Cys326Cys형이 32례(39.5%)로 두 군 사이에 통계적인 유의성이 관찰되었다(p=0.022). 또한 Cys326Cys형과 나머지(Ser326Ser, Ser326Cys)형으로 나누어 시행한 통계 분석에서도 대조군에서는 각각 18례(22.2%), 63례(77.8%)였으며 전립선비대증 환자군에서는 32례(39.5%), 49례(60.5%)로 통계적인 유의성이 관찰되었다(p=0.017, OR=2.286, 95% CI=1.149-4.546). 결론: hOGG1 유전자의 형태와 전립선비대증의 발생과는 밀접한 관련이 있었다. 즉 hOGG1 Cys326Cys형을 가진 사람에서 전립선비대증이 발생한 가능성이 높을 것으로 사료된다. Purpose: 8-oxoguanine DNA glycosylase (OSS1) rapairs DNA by removing 8-oxoguanine (oh8Gua), a highly mutagenic oxidative DNA adduct. Recently, the human gene for OGG1 (hOGG1) was cloned and several genotypes have been reported. However, the implications of such genotypes in benign prostatic lyperplasia have not been demonstrated. To assess the involvement of hOGG1 associated with the aging process on the developing of BPH, we analyzed the genetic polymorphisms of hOGG1. Materials and Methods: We studied the hOGG1 gene polymorphisms in 81 cases of BPH and 81 cases of normal controls. We performed the SSCP, PCR-based restriction fragment length polymorphism (RFLP) and direct sequencing to characterize the genetic polymorphisms of hOGG1 in both BPH patients and controls. Results: We found two polymorphic sites. A serine326/cysteine polymorphism at codon 326 (1a type) in exon 7 was associated with an exchange of amino acid. Another polymorphic site at codon 324 (1b type) in exon 6 was silent. We found that the distribution of hOGG1 genotypes in BPH patients (Ser326Ser type 18.5%, Ser326Cys type 42.0% and Cys326Cys type 39.5%) was significantly different from that in controls (14.8%, 63.0% and 22.2%, respectively) (p=0.022). Homozygosity for the Cys326Cys genotype significantly increased the risk of developing BPH, with the odds ratio (OR) being 2.286 (95% confidence interval [CI]=1.149-4.546) Conclusion: Our results suggest that the hOGG1 Cys326Cys genotype might play a important role in the development of BPH.