• Title/Summary/Keyword: Li-Hak

Search Result 184, Processing Time 0.021 seconds

Thermally Crosslinked Polyimide Binders for Si-alloy Anodes in Li-ion Batteries

  • Chang, Hyeong-Seok;Ji, Sang-Gu;Rho, Miso;Lee, Byoung-Min;Kim, Sung-Soo;Choi, Jae-Hak
    • Journal of Electrochemical Science and Technology
    • /
    • v.13 no.3
    • /
    • pp.339-346
    • /
    • 2022
  • Silicon (Si) has attracted considerable attention due to its high theoretical capacity compared to conventional graphite anode materials. However, Si-based anode materials suffer from rapid capacity loss due to mechanical failure caused by large volume change during cycling. To alleviate this phenomenon, crosslinked polymeric binders with strong interactions are highly desirable to ensure the electrode integrity. In this study, thermally crosslinked polyimide binders were used for Si-alloy anodes in Li-ion batteries. The crosslinked polyimide binder was found to have high adhesion strength, resulting in enhanced electrode integrity during cycling. Therefore, the Si-alloy anodes with crosslinked polyimide binder provide enhanced electrochemical performance, such as Coulombic efficiency, capacity retention, and cycle stability.

Trends in Clinical Studies Including LI4 Acupoint Stimulation in Korean Journals (국내 학술지에 게재된 합곡혈 임상연구 동향)

  • Joohyun Jung;Hyungsuk Yang;Seungmin Han;Dong Hak Yoon;Seungtae Kim
    • Korean Journal of Acupuncture
    • /
    • v.40 no.4
    • /
    • pp.149-155
    • /
    • 2023
  • Objectives : Hapgok (LI4) is one of the most widely used acupoints in clinical practice. This study aims to investigate the trend of clinical studies including LI4 acupoint stimulation in Korea. Methods : Papers of clinical researches including LI4 acupoint stimulation in Korean journals were searched in Korean databases of Korean Traditional Knowledge Portal, Korean Studies Information Service System, Korea Citation Index, DBpia, Research Information Sharing Service, and ScienceON. The papers were then analyzed focusing on the number of publications by year, the types of the clinical research, interventions, research topics, institutes, and journals. Results : A total of 154 publications were included in this study. The first paper was published in 1981, and the number of papers has gradually increased since the 1990s. Although LI4 acupoint stimulation was included, most of the papers had additional acupoints and interventions. Diseases of the nervous system were the most common, followed by diseases of the digestive system and diseases of the circulatory system. Kyung Hee University is the institution that published the most papers, and the journal that published the most papers is The Journal of Korean Oriental Internal Medicine. Conclusions : Since the 1990s, the number of clinical studies on LI4 acupoint has increased. However, the results of the studies are insufficient to prove the efficacy of LI4 acupoint because most of the studies were case reports using additional acupoints and interventions. Therefore, more rigorous studies are needed to prove the efficacy of LI4 acupoint.

Salmonella vector induces protective immunity against Lawsonia and Salmonella in murine model using prokaryotic expression system

  • Sungwoo Park;Eunseok Cho;Amal Senevirathne;Hak-Jae Chung;Seungmin Ha;Chae-Hyun Kim;Seogjin Kang;John Hwa Lee
    • Journal of Veterinary Science
    • /
    • v.25 no.1
    • /
    • pp.4.1-4.14
    • /
    • 2024
  • Background: Lawsonia intracellularis is the causative agent of proliferative enteropathy and is associated with several outbreaks, causing substantial economic loss to the porcine industry. Objectives: In this study, we focused on demonstrating the protective effect in the mouse model through the immunological bases of two vaccine strains against porcine proliferative enteritis. Methods: We used live-attenuated Salmonella Typhimurium (ST) secreting two selected immunogenic LI antigens (Lawsonia autotransporter A epitopes and flagellin [FliC]-peptidoglycan-associated lipoprotein-FliC) as the vaccine carrier. The constructs were cloned into a Salmonella expression vector (pJHL65) and transformed into the ST strain (JOL912). The expression of immunogenic proteins within Salmonella was evaluated via immunoblotting. Results: Immunizing BALB/c mice orally and subcutaneously induced high levels of LI-specific systemic immunoglobulin G and mucosal secretory immunoglobulin A. In immunized mice, there was significant upregulation of interferon-γ and interleukin-4 cytokine mRNA and an increase in the subpopulations of cluster of differentiation (CD) 4+ and CD 8+ T lymphocytes upon splenocytes re-stimulation with LI antigens. We observed significant protection in C57BL/6 mice against challenge with 106.9 times the median tissue culture infectious dose of LI or 2 × 109 colony-forming units of the virulent ST strain. Immunizing mice with either individual vaccine strains or co-mixture inhibited bacterial proliferation, with a marked reduction in the percentage of mice shedding Lawsonia in their feces. Conclusions: Salmonella-mediated LI gene delivery induces robust humoral and cellular immune reactions, leading to significant protection against LI and salmonellosis.

Separation Characteristics of NdCl3 from LiCl-KCl Eutectic Salt in a Reactive Distillation Process using Li2CO3 or K2CO3 (탄산화물(Li2CO3, K2CO3)을 이용한 반응증류공정에서 LiCl-KCl 공융염 내 NdCl3의 분리특성)

  • Eun, Hee-Chul;Choi, Jung-Hoon;Lee, Tae-Kyo;Cho, In-Hak;Kim, Na-Young;Yu, Jae-Uk;Park, Hwan-Seo;Ahn, Do-Hee
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
    • /
    • v.13 no.3
    • /
    • pp.181-186
    • /
    • 2015
  • It is necessary to develop an effective waste salt treatment technology for the minimization of radioactive waste generation from the pyroprocessing of spent nuclear fuel. For this reason, the separation characteristics of NdCl3 from LiCl-KCl eutectic salt in a reactive distillation process using Li2CO3 or K2CO3 were observed. NdCl3 was converted into oxychloride (NdOCl) or oxide (Nd2O3) in the reaction model between NdCl3 and the carbonates using HSC-Chemistry, and this result was confirmed in the reactive distillation test of the LiCl-KCl-NdCl3 system using the carbonates. Based on these results, the reactive distillation process conditions were determined to separate NdCl3 into an oxide form (Nd2O3) which can be easily fabricated into a final waste form.

Separation and Solidification of Rare Earth Nuclides from LiCl-KCl Based Eutectic Waste Salts using a series of Phosphorylation/Distillation/Solidification Processes (인산화/증류/고화의 일련공정을 이용한 LiCl-KCl 공융염폐기물 내 희토류 핵종 분리 및 고화)

  • Eun, Hee-Chul;Choi, Jung-Hoon;Cho, In-Hak;Park, Hwan-Seo;Park, Geun-Il
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
    • /
    • v.11 no.4
    • /
    • pp.325-332
    • /
    • 2013
  • Pyroporcessing of spent nuclear fuel generates a considerable amount of LiCl-KCl eutectic waste salt containing radioactive rare earth (RE) chlorides. In this study, a series of processes, which consist of a phosphorylation/distillation process and a solidification process, were performed to minimize volume of the LiCl-KCl eutectic waste salt and solidify a residual waste into a stable form at a relatively low temperature. Over 99wt% of RE chlorides in LiCl-KCl eutectic salt was converted and separated into $REPO_4$ in the phosphorylation/distillation process using a mixture of $Li_3PO_4-K_3PO_4$. The separated $REPO_4$ was solidified into a homogeneous and fine-grained form at $1,050^{\circ}C$ using LIP(Lead Iron Phosphate) as a solidification agent. The final waste volume was reduced below about 10% through the series of the processes.

1차원 무기 반도체 신 물질 재료의 연구 개발 동향

  • Ryu, Hak-Gi
    • Ceramist
    • /
    • v.21 no.2
    • /
    • pp.29-37
    • /
    • 2018
  • In order to overcome the problems of existing low-dimensional materials (carbon nanotubes, graphene, transition metal dichalcogenides, etc) researches on new 1D materials have been studied. In the case of $LiMo_3Se_3$ and $Mo_6S_{9-x}I_x$, continuous researches have been carried out for 3D bulk synthesis and atomic scale dispersion. Recently, quantum confinement effect of $LiMo_3Se_3$ and bio-stability of $Mo_6S_{9-x}I_x$ have been proven and various applications have started to be studied. In addition, device application results using new 1D materials such as $Sb_2Se_3$ (optoelectronic devices using the property of effectively reducing exciton decay due to no dangling bond) and $VS_4$ (electrochemical energy storage using the space between 1-D nanostructures) have been reported very importantly. Therefore, it can be claimed that it has reached a very important time to find and synthesize new 1D materials and to report various characteristics not existing.

The Origin of Physiological Characteristics of Tripple Energizers (三焦) in Introduction to Medicine (YiXueRunMen, 醫學入門) (『의학입문(醫學入門)』 삼초(三焦) 생리 특성의 유래)

  • Jo, Hak-Jun
    • The Journal of Korean Medical History
    • /
    • v.28 no.2
    • /
    • pp.23-36
    • /
    • 2015
  • Objectives : This research had been designed to survey Li Chan 's viewpoint of physiological characteristics of tripple energizers and discover his own medical distinction in them. Methods : First, look up contents related with it's physiological characteristics in his book, Introduction to Medicine. Second, investigate which books they had derived from. Third, decide whether the contents were originative or not. Results & Conclusions : Even though his viewpoint of it's characteristics mostly followed Neijing (內經) and Nanjing (難經), he partially changed and added some theories in his book. For example, he regarded that tripple energizers played a role in not only 6 vowels but also 5 viscera, developed man's essence-spirit and made his joints strong. These came from Wang Haogu (王好古)'s CiShiNanJi (此事難知), Suwen (素問) ShengQiTongTianLun (生氣通天論) and so on.

An Interpretation of Verses Related to Lobes of Liver(肝葉) in the 『Yixuerumen(醫學入門)』 (『의학입문』 간엽(肝葉) 관련 문장의 새 해석)

  • Jo, Hak-jun
    • Journal of Korean Medical classics
    • /
    • v.34 no.1
    • /
    • pp.27-36
    • /
    • 2021
  • Objectives : This paper aims to solve difficulties surrounding the verses related to lobes of liver in the 『Yixuerumen』. Methods : First, relevant verses were selected from the 『Yixuerumen』, then compared to texts from which they had originated. The differences and contrarieties between the texts were resolved through the perspective of plant taxonomy. Results : Wangbing's 'buye(布葉)' was taken as the seed leaf of the dicotyledonous plant and corrected to 'daye(大葉)' by Li Chan. The expression 'Yixiaoye(一小葉)' was understood as describing the many main leaves that look like one big leaf, which grow in between the seed leaves. 『Nanjing』's interpretation of there being three leaves on the left, and four on the right describes the leaf pattern that grows in alternation. Conclusions : Through analysis of the verses related to lobes of liver in the 『Yixuerumen』, we can presume that Li Chan had the knowledge and understanding required in plant taxonomy such as characteristics of a dicotyledonous plant and phyllotaxis.