Micro-Chemical Structure of Polyaniline Synthesized by Self-Stabilized Dispersion Polymerization

NamGoong, Hyun,Woo, Dong-Jin,Lee, Suck-Hyun The Polymer Society of Korea 2007 Macromolecular Research Vol.15 No.7

A variety of NMR techniques were applied to the micro-chemical structural characterization of polyanilines prepared via an efficient synthetic method in a self-stabilized dispersion medium in which the polymerization was conducted in a heterogeneous organic/aqueous biphasic system without any stabilizers. Here, the monomer and growing polymer chain were shown to function simultaneously as a stabilizer, imparting compatibility for the dispersion of the organic phase, and as a form of flexible template in an aqueous reaction medium. Polymerizations predicated on this concept generated polyanilines with a low defect content: solution state $^{13}C-NMR$ and solid $^{13}CDD/CP/MAS$ spectroscopy indicated that the synthesized HCPANi and its soluble derivative, HCPANi-t-BOC, evidenced distinctly different NMR spectra with fewer side peaks, as compared to conventionally prepared PANis, and the complete structural assignments of the observed NMR peaks could be determined via the combination of both 1D and 2D techniques. Ortho-linked defects in HCPANi were estimated to be as low as 7%, as shown by a comparison of the integration of the carbonyl carbon resonance peaks.

Two Dimensional Transfer Modes in $CH_2$ Spin System

NamGoong Hyun Korean Magnetic Resonance Society 2006 Journal of the Korean Magnetic Resonance Society Vol.10 No.1

Spin-lattice relaxation pathway of $CH_2$ spin system by two dimensional NOESY sequence has been discussed. Two-dimensional spectra governed by dipolar relaxation mechanism were simulated in term of transfer mode, the generalization of conventionally used magnetization mode in one dimension. The transfer matrix directly related to the Redfield relaxation matrix can be constructed by the multiplet of transfer mode. The observable relaxation transfer modes causes to variation of the off-diagonal signal intensity of phase sensitive NOESY spectra from which variable spectral density can be extracted with simple group theoretical calculation. The variation of the J-coupling peak intensity as a function of the mixing time in 2-D spectra for $n-Undecane-5-^{13}C$ and Bromoacetic $2-^{13}C$ acid has been theoretically traced.

EFFECTS OF NATURALLY OCCURRING FLAVONOIDS ON MITOGEN-INDUCED LYMPHOCYTE PROLIFERATION AND MIXED LYMPHOCYTE CULTURE

Namgoong.S.Y 강원대학교 종합약학연구소 1994 약학연구 Vol.7 No.-

Developing and Establishing a Wound Dressing Team: Experience and Recommendations

Namgoong Sik,Baik Seunghee,Han Seung-Kyu,Son Ji-Won,Kim Jae-Yeon 대한의학회 2023 Journal of Korean medical science Vol.38 No.21

Background: The existing literature has comprehensively examined the benefits of specialized wound-care services and multidisciplinary team care. However, information on the development and integration of wound-dressing teams for patients who do not require specialized wound care is scarce. Therefore, the present study aimed to elucidate the benefits of a wound-dressing team by reporting our experiences with the establishment of a wounddressing team. Methods: The wound-dressing team was established at Korea University Guro Hospital. Between July 2018 and June 2022, 180,872 cases were managed for wounds at the wounddressing team. The data were analyzed to assess the types of wounds and their outcomes. In addition, questionnaires assessing the satisfaction with the service were administered to patients, ward nurses, residents/internists, and team members. Results: Regarding the wound type, 80,297 (45.3%) were catheter-related, while 48,036 (27.1%), 26,056 (14.7%), and 20,739 (11.7%) were pressure ulcers, dirty wounds, and simple wounds, respectively. In the satisfaction survey, the scores of the patient, ward nurse, dressing team nurse, and physician groups were 8.9, 8.1, 8.2, and 9.1, respectively. Additionally, 136 dressing-related complications (0.08%) were reported. Conclusion: The wound dressing team can enhance satisfaction among patients and healthcare providers with low complications. Our findings may provide a potential framework for establishing similar service models.

Analysis of the Traditional Setting-up as an Application for Spatial Composition

NamGoong, Sun,Lee, Yu-Ri Korea Furniture Society 2010 한국가구학회지 Vol.21 No.3

Recently, there is a new issue, among the contemporary people, for new life style, such as green design and well being. This trend brought up the necessity that there should be alternatives for interior spatial design. In order to catch up with these new issues, the new convenient and environment friendly methods are in need. Space composition using setting-up is skill that can express both the structural aspect and esthetic because it represents traditional beauty into the contemporary age through the structural rigidity and formal beauty. Also the lumber, as main materials for setting up, is in line with well being life style and environment friendliness. The construction of structure by setting-up has advantages in terms of the reuse and the convenience in that the construction of structure is adjustable according to environment. And setting-up has enough plasticity not only because of its own role as linking the objects but also because of being framed by itself. Therefore setting-up will be a design element, if it is expressed outward. Thus, this study aims to give a guide line about how to apply the result from the evaluating that "what is the most suitable setting-up" and "what is the most suitable detail setting-up", based on that structural rigidity, decorativeness and the ease of works. As a result of evaluation, the most excellent types of setting-up in terms of structural rigidity are "Jangbu" and "Panjae" and "Yeongui". The most excellent types of setting-up in terms of decorativeness are "Panjae" and "Yeongui", and the most excellent type of the ease of work is "Mat". And also the most applicable detail setting-up for the utilization of spatial composition is proposed.

The Prolyl Isomerase Pin1 Induces LC-3 Expression and Mediates Tamoxifen Resistance in Breast Cancer

Namgoong, G.M.,Khanal, P.,Cho, H.-G.,Lim, S.-C.,Oh, Y.K.,Kang, B.S.,Shim, J.-H.,Yoo, J.-C.,Choi, H.S. The American Society for Biochemistry and Molecula 2010 The Journal of biological chemistry Vol.285 No.31

Pediatric liver transplantation using a hepatitis B surface antigen-positive donor liver graft for congenital absence of the portal vein

Namgoong Jung-Man,Hwang Shin,Kim Dae-Yeon,Ha Tae-Yong,Song Gi-Won,Jung Dong-Hwan,Kim Kyung Mo,Oh Seak Hee 대한이식학회 2021 Korean Journal of Transplantation Vol.35 No.1

Congenital absence of the portal vein (CAPV) is a rare venous malformation in which mesenteric venous blood drains directly into systemic circulation. Herein, we report a case of pediatric deceased donor liver transplantation (DDLT) for symptomatic CAPV with whole liver graft from a hepatitis B surface antigen (HBsAg)-positive donor. A 4-year-old boy suffered from CAPV and secondary portal hypertension. He was also diagnosed with DiGeorge syndrome and heart anomalies. After waiting for 4 months, a 5-year-old donor weighing 19 kg with positive HBsAg was allocated to this 4-year-old patient weighing 15 kg. Recipient operation was performed according to the standard procedures of pediatric DDLT. Portal vein reconstruction was performed using interposition of a vascular homograft conduit to the superior mesenteric vein-splenic vein confluence. The patient recovered uneventfully from DDLT. He has been administered with lamivudine to prevent hepatitis B virus infection. This patient has been doing well for 5 years after DDLT without growth retardation. In conclusion, CAPV patients can have various vascular anomalies, thus combined vascular anomalies should be thoroughly assessed before and during liver transplantation operation. The most effective reconstruction techniques should be used to achieve satisfactory results following liver transplantation.

Improving nanoparticle dispersions of pigment and its application to a color filter: New phthalocyanine derivatives as synergist

Namgoong, Jin Woong,Chung, Sei-Won,Jang, Hyeyoun,Kim, Young Hoon,Kwak, Moo Sun,Kim, Jae Pil Elsevier 2018 Journal of industrial and engineering chemistry Vol.58 No.-

<P><B>Abstract</B></P> <P>Four synergists were synthesized to enhance pigment nanoparticles dispersion and the contrast ratio. The interaction between the synergist and the dispersant was confirmed by infra-red (IR) spectrometry. We demonstrate that the hydrogen bonds forming between the synergist and the dispersant act as a key factor. To analyze the dispersion properties, dynamic light scattering (DLS), and electron microscopic analysis was examined. The spectral and color characteristics was also measured by UV–vis spectrometry and colorimetry, and the contrast ratio of color filters was evaluated. This study confirms that the prepared synergist can increase the contrast ratio of green color filter.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Effects of Isoflavonoids on Mouse Lymphocyte Proliferation In Vitro

Namgoong, Soon-Young,Lee, Chang-Hee,Lim, Hyun-Pyo The Pharmaceutical Society of Korea 1994 Archives of Pharmacal Research Vol.17 No.4

The suppressive activity of isoflavonoids against lymphocyte proliferation in vitro was examined. Isoflabvonoid derivatives tested were isflavones isolated from Pueraia radix and synthesized 7-O-substituted biochanin A derivatives. The certain isoflavones such as biochanin A and 2-carbethoxybiochainin A were found to possess the suppressive activity against concanavaline A (Con A)-induced lymphocyte proliferation from mouse spleen. Against mixed lymphocyte culture reaction, biochanin A, 2-carbethoxybiochainin A, daidzein, formononetin, genistein and 7-O-isopropylbiochaninl A showed the suppressive activity at $10^{-5}$ M. However, all isoflavones tested did not show the suppressive activity against lymphocyte proliferation induced by B-cell mitogen, lipopolysaccharide (LPS). In general, isoflavones were revealed to be less active than flavones/flavonols.

Aryloxy- and chloro-substituted zinc(II) phthalocyanine dyes: Synthesis, characterization, and application for reducing the thickness of color filters

Namgoong, Jin Woong,Kim, Se Hun,Chung, Sei-Won,Kim, Young Hoon,Kwak, Moo Sun,Kim, Jae Pil Elsevier 2018 Dyes and pigments Vol.154 No.-

<P><B>Abstract</B></P> <P>In the development of display devices, a color filter is still considered an indispensable component. For a thinner display panel, the thickness of the color filter also needs to be decreased. However, if the thickness of the color filter is reduced, the color properties, including the color purity and color gamut are simultaneously diminished. Therefore, introduction of new colorants is needed to lower the thickness without diminishing the color performance. In this study, four phthalocyanine green dyes were synthesized for use in color filters. The molecular geometry and absorption properties were predicted by density functional theory (DFT) and time-dependent DFT, and UV-Vis spectroscopy was employed to measure the optical properties. The thermal stabilities of the dyes were examined by thermogravimetric analysis. A dye with suitable solubility and color properties was adopted in the color filter, and the optical properties and thickness of the dye-based color filter were compared to those of the pigment-based color filter. The chromatic performance and thickness of the color filter were determined by color spectrometry and Alpha step, respectively. Finally, we confirmed that the dye could enable the decrease in the thickness of the filter and provide a superior color property.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Chloro- substituted (α positions) zinc phthalocyanine (Dye 3b) possessed a saddle core structure. </LI> <LI> The enhancing bulkiness inhibits the π-π stacking of the phthalocyanine molecules, thus increasing solubility. </LI> <LI> The dye decreases a thickness of color filter by 20%, owing to its higher color strength than that of pigments. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>