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LiCoO₂의 합성 공정변수에 따른 리튬이차전지 정극의 전기화학적 특성 연구
이철태,오치훈,엄의흠,송연호 조선대학교 생산기술연구소 2003 生産技術硏究 Vol.25 No.2
리튬이차전지용 정극활물질 LiCoO₂를 소성법 을 이용하여 합성공정변수를 달리하여 합성하고 합성공정변수가 이들의 물리화학적인 재료특성 및 전기화학적인 특성에 미치는 영향을 조사하였다. 출발 물질로 LiOH · H₂O와 Co₃O₄를 사용하였으며, 750℃, 6시간 이상의 조건에서 결정의 LiCoO₂가 합성되기 시작하였으며, 반응온도가 높아지고 반응시간이 길어질수록 LiCoO₂의 결정성이 증가하였다. 여러 합성 조건 중 가장 우수한 전기화학적 특성을 보이는 조건은 반응옹도 750℃ 반응시간 24시간이었다. 이 조건에서 합성한 LiCoO₂로 Li/1M LiCIO₄ in PC + DME/LiCoO₂의 cell을 구성한 후 0.25mAh/㎠며의 전류밀도로 충 · 방전 하였을 경우 초기 방전 용량은 130mAh/g이였으며, 10cycle 후 방전 용량은 130mA h/g에서 109mAh/g으로 16%의 용량감소가 일어났다. LiCoO₂, the active material of positive electrode in lithium secondary battery, was synthesized by calcination with LiOH · H₂O and C0₃O₄. And relationships between synthesis condition and physical and electrochemical characteristics of LiCoO2 were investigated. Synthesis condition of 750℃, 6hr, LiCoO₄ crystal began to be formed, and the crystallinity of LiCoO₂ increased with reaction temperature and reaction time. LiCoO₂ synthesized by calcination at 750℃ during 24hr showed best electrochemical characteristics. The initial discharge capacity of LiCoO₂ synthesized under this condition was 130mAh/g, and after 10 cycles, the discharge capacity decreased to 109mAh/g.
李鐵泰,李鎭植,嚴明憲 단국대학교 1993 論文集 Vol.27 No.-
The kinetic study for the chlorination of α-Fe_2O_3 with ammonium chloride in a boat batch reactor was carried out to find both a possibility of NH_4Cl being an alternative chlorine source and a solution to solve the problem of the present manufacture process for soda ash. Chlorination rate data under isothermal condition from 250℃ to 375℃ were fitted to different rate equation and have been found to be well represented by the equation 1-2/3x-(1-x)^2/3=kt, which is based upon diffusion of HCl gas from the decomposition of NH_4Cl through a product lay, FeCl_3. According to this model the activation energy for the chlorination of α-Fe_2O_3 with ammonium was calculated as 17.97Kcal/mol.
회전판 접촉공정 (Rotating Biological Contactor System)을 이용한 Cr(Ⅵ) 이온의 제거
李鐵泰,韓圭正,嚴明憲 단국대학교 1989 論文集 Vol.23 No.-
This study was carried out to find a new process for removal of Cr(VI) ion from the industrial wastewater by the Rotating Biological Contactor system. The proper operation conditions for removal Cr(VI) ion were pH=7.2-7.4, tip speed 10.0m/min and flow rate of influent 47.41L/min. day in this RBC system. Under the above mentioned conditions, the BOD removal effiency was more than 94% in the case of the influent which contain Cr(VI) ion removal efficiency was more than 90% as far as influent of 2.0㎎/L Cr(VI) was fed to this RBC system.
엄기진,이철규,박장평,이광재,문병용,홍관이,노성규,오수일,박기동 江原大學校附設體育科學硏究所 1985 江原大學校附設體育科學硏究所論文集 Vol.- No.10
This study conducted for analyze the process of physiological variation during shooting, and produce the basic data for training prescription to the performance improvement in Air Rifle Shooting, 9 Elite Rifle shooters )College 3, High School 3, Middle School 3) in GangWeon province were tested the physiological parameter which are Electrocardiograph(E.C.G), Heart-rate(H.R), Respiratory pattern, and Trigger time by polygraph system 8 channel from Sept. 1st to Sept. 10th, 1985. Analyzed experimental results are as follows; 1. Firing at T-P wave in E.C.G, 77.68bpm in H.R)16.68% by resulting H.R), the deep size of inspiration-expiration was low, and 8.34 sec of trigger interval were appeared when the shooter acquired high score. 2. The most effective factor among physiological parameters for excellent shooting score is the inspiratory volume with decresc breathing pattern. 3. Shooting performances correlated with stability and static-dynamic balance, but flexibility effected on negative correlation.
홍관이,이광재,김두경,부기원,노성규,한상준,박기동,오수일,문병용,이철규,박장평,엄기진,박남환 江原大學校附設 體育科學硏究所 1984 江原大學校附設體育科學硏究所論文集 Vol.- No.9
This study is designed to grasp the elements and situations of stage fright in order to propose a part of ways to cope with it. We make 511 top-class high school players, male and female, in the central districts (Seoul, Inchon, Kyungki, Chungbuk, and Kangweon Province) on object of questionnaire, and get the following results. Through players generally have all-round characters they show weakness in the superiority and emotional stability while showing strength in the sonformity. This fact comes to be related to the elements which cause stage fright. Physiological changes also have many effects on the symptom of stage fright. Especially, stage fright increases when players show sensitive reaction to the self-consciousness of final consequence which comes from the tension or uneasiness of sympathetic nerve, Thus, it turns out that players make use of reducing psychological burden by physical exercise or adjusting the level of demanded result in order to release the stage fright.
Um, In-Chul,Park, Young-Hwan The Korean Fiber Society 2007 Fibers and polymers Vol.8 No.6
Regenerated silk fibroin(SF)/Poly(vinyl alcohol)[PVA] blend films were prepared using different casting solvents, water and formic acid, to elucidate the effect of casting solvent on the structure and miscibility of SF/PVA blends. FTIR and XRD measurement suggested that ${\beta}$-sheet conformation of SF was not changed by addition of PVA in case of formic acid casting and the casting solvent determined the crystallized component of SF/PVA, leading to a different trend in the overall crystallinity between the two blends. The casting solvent had a dominant role in deciding phase behavior and molecular miscibility of blend films. SEM observation and DMTA measurement elucidated that water solvent produced phase-separated blend films while formic acid yielded one phase blend films with partial miscibility in molecular level indicating that the miscibility of SF blend can be improved by choosing a proper co-solvent.
Adaptive Weighting of Structural Dependency and Textual Similarity in Software Architecture Recovery
UM, Jae-Chul,LEE, Ki-Seong,LEE, Chan-Gun 'Institute of Electronics, Information and Communi 2016 IEICE transactions on information and systems Vol.99e.d No.3
<P>Software architecture recovery techniques are often adopted to derive a module view of software from its source code in case software architecture documents are unavailable or outdated. The module view is one of the most important perspectives of software architecture. In this paper, we propose a novel approach to derive a module view by adaptively integrating structural dependency and textual similarity. Our approach utilizes Newman modularity and Shannon information entropy to determine the appropriate weights of the dependencies during the integration. We apply our approach to various open-source projects and show the experimental results validating the effectiveness of the approach.</P>
Um, In-Chul,Kim, Tae-Hee,Kweon, Hae-Yong,Ki, Chang-Seok,Park, Young-Hwan The Polymer Society of Korea 2009 Macromolecular Research Vol.17 No.10
In this paper, the relaxation behavior of the regenerated silk fibroin (SF) films was investigated using dielectric thermal analysis (DETA), and compared with the dynamic mechanical behavior obtained from dynamic mechanical thermal analysis (DMTA), in order to gain a better understanding of the characteristics of dielectric behavior of SF film and identify the differences between the two analyses. Compared to DMTA, DETA exhibited a higher sensitivity on the molecular relaxation behaviors at low temperature ranges that showed a high $\gamma$-relaxation peak intensity without noise. However, it was not effective to examine the relaxation behaviors at high temperatures such as $\alpha-$ and ${\alpha}_c$-relaxations that showed a shoulder peak shape. On the contrary, DMTA provided more information regarding the relaxation behaviors at high temperatures, by exhibiting the changes in width, intensity and temperature shift of the $\alpha$-relaxation peak according to various crystallinities. Conclusively, DETA and DMTA can be utilized in a complementary manner to study the relaxation behavior of SF over a wide temperature range, due to the different sensitivity of each technique at different temperatures.
Um, In-Chul,Rico, Catherine W.,Kweon, Hae-Yong,Kang, Mi-Young Korean Society of Sericultural Science 2011 International Journal of Industrial Entomology Vol.22 No.2
The effect of diet supplementation of Antheraea pernyi (A. pernyi) silk fibroin on the lipid metabolism and antioxidant defense status in high fat-fed mice was investigated. The animals were given normal control diet (NC group), high fat diet (HF group), or high fat diet supplemented with A. pernyi silk fibroin powder (HFS group) for 7 weeks. After the experimental period, the HF group showed significant increase in body weight, plasma and hepatic total cholesterol levels, and hepatic triglyceride concentration, and decreased activities of hepatic antioxidant enzymes relative to NC group. However, the HFS group exhibited marked reduction in body weight, plasma cholesterol and hepatic triglyceride levels, hepatic lipogenic enzyme activities, and lipid peroxidation rate, and higher high-density lipoprotein (HDL)-cholesterol level, fecal triglyceride content, and antioxidant enzymes activities compared with that of HF group. These findings demonstrate that dietary feeding of A. pernyi silk fibroin could improve the lipid metabolism and antioxidant defense system via regulation of hepatic antioxidant and lipogenic enzymes activities. Hence, this silk fibroin may be beneficial as a functional biomaterial for the development of therapeutic agent against high fat diet-induced hyperlipidemia and its related diseases.