• Polymer(Korea)
• /
• v.39 no.3
• /
• pp.468-474
• /
• 2015

Electrically conductive polymer nanocomposites were prepared by the inclusion of graphene-based nanofillers. Graphene oxide (GO) and reduced graphene oxide wrapped by poly(styrene sulfonate) (PSS-RGO) were used as nanofillers to make good dispersion with the aqueous dispersion of polystyrene (PS) particles. GO sheets were synthesized by the modified Hummers' method from graphite, and PSS-RGO sheets were prepared by the reduction of GO-dispersed PSS solution with hydrazine monohydrate. Morphology and properties of PS/GO and PS/PSS-RGO nanocomposites via latex technology were investigated. Both nanofillers showed well dispersed morphology in PS matrix. Rheological and electrical percolation thresholds were 0.28 and 0.51 wt% for GO, and 0.50 and 1.01 wt% for PSS-RGO respectively. It is speculated that PS/GO nanocomposites showed better conductivity than PS/PSS-RGO counterparts due to the partial recovery of GO by thermal reduction during molding.

• Journal of Acupuncture Research
• /
• v.20 no.5
• /
• pp.28-37
• /
• 2003

Objective & Methods: In order to ascertain the names. locations. the way of getting acu-point and indications for moxibustion about Ko-Hwang(膏盲) and Go-Hwang-Su(膏盲兪). I have translated the text for Ko-Hwang(膏盲) and Go-Hwang-Su(膏盲兪) collected in several relative classical books. and performed literal investigation about it. Through the study, the following results are obtained. Results & Conclusions: 1. The two words Go(膏) and Hwang(盲) have different concepts each other originally. and Go-Hwang(膏盲) is the abbreviation of the words "Upon the Hwang(盲), Under the Go(膏)", which means "A gap of Heart and diaphragm" that is under the heart and on the diaphragm 2. Go-Hwang-Su(膏盲兪) is the acu-point which can treat the diseases located in the gap of Go(膏) and Hwang(盲), so they must not be named as Go-Hwang(膏盲) or Go-Hwang-Hyui(膏盲穴). 3. The origination of Go-Hwang-Su(膏盲兪) is speculated as the interval of Hwang-Bo-Mil(皇甫謐) and Son-Sa-Mak(孫思邈). And I think it had been created by Son-Sa-Mak(孫思邈) up to now. 4. The words "Four ribs and Three spaces(四肋三間)" those are founded in the text of The Entrance of Medicine(醫學入門) and The Great Success on Acupuncture and Moxibustion(針灸大成) are either the words those had been quoted from The Bible of Helping Life by Acupucture and Moxibustion(針灸資生經) in wrong way. or the misunderstanding of the original mind of Son-Sa-Mak(孫思邈) as being quoted in the text. So you should know it exactly as Son-Sa-Mak(孫思邈) had said. 5. When you search the acu-point Go-Hwang-Su(膏盲兪), you must pull the arms of patients forwardly to reveal the acu -point. because it is covered by the scapula in normal posture. 6. The indications for the use of Go-Hwang-Su(膏盲兪) are same as mentioned in this study. And it can grow the Yang-Gi(陽氣) more prosperous.

• Applied Chemistry for Engineering
• /
• v.27 no.1
• /
• pp.45-49
• /
• 2016

In the presence of poly(4-styrene sulfonate) (PSS) and excess amount of graphene oxide (GO), we conducted in-situ polymerization of 3,4-ethylenedioxythiophene (EDOT) without an oxidant. XPS and IR spectroscopies of the product (GO-P) showed that PEDOT/PSS was successfully synthesized by oxidative polymerization of EDOT and hybridized with GO. GO-P displayed a stable aqueous suspension, however, the high content (42%) of GO in GO-P diminished electrical conductivity down to $15S{\cdot}m^{-1}$. Annealing of GO-P films at $200^{\circ}C$ for 8 hr induced partial reduction of GO and finally enhanced electrical conductivity up to $212S{\cdot}m^{-1}$.

• Journal of the Korean Institute of Gas
• /
• v.16 no.4
• /
• pp.8-15
• /
• 2012

The GO-FLOW methodology is capable of assessing system reliability. It models the system into a GO-FLOW chart with signal lines and operators and assesses the reliability of system by assessing the GO-FLOW chart sequential. But, as it models one component of system into several operators, the GO-FLOW chart which is different from the system flow diagram be modeled. Also, as it models the real operation time into "time point", it is hard to assess the reliability change according to the real operation time. Therefore, in this paper, the new GO-FLOW methodology which use the function(success/failure) of system components has been developed. It can assess the successful operating probability of system, regardless of the operating status of components. As it models one component of system into one operator, the GO-FLOW chart which is similar the system flow diagram can be modeled. Also, it is able to easily assess the successful probability of system according to the real operation time using the time in the operators.

• Biomedical Science Letters
• /
• v.13 no.2
• /
• pp.127-133
• /
• 2007

Heterotrimeric GTP binding proteins (G proteins) mediate signal generated by neurotransmitter and hormones. Among all G proteins, Go is the most abundant in brain but its role in brain is not clearly understood. To determine the function of the alpha subunit of Go (Go$\alpha$), we search for the interacting partner of Go$\alpha$ in brain using yeast two-hybrid system. A resistant to inhibitor of cholinesterase (Ric-8B) was identified as a Go$\alpha$ interacting protein. We confirmed interaction between Go$\alpha$ and Ric-8b employing in vitro affinity binding assay and showed that the Ric-8b increased the function of Go$\alpha$. Our findings indicate that Ric-8b is possible guanine nucleotide exchange factor for Go$\alpha$.

• BMB Reports
• /
• v.45 no.2
• /
• pp.120-125
• /
• 2012

We have developed a biologist-friendly, Java GUI application (GoBean) for GO term enrichment analysis. It was designed to be a comprehensive and flexible GUI tool for GO term enrichment analysis, combining the merits of other programs and incorporating extensive graphic exploration of enrichment results. An intuitive user interface with multiple panels allows for extensive visual scrutiny of analysis results. The program includes many essential and useful features, such as enrichment analysis algorithms, multiple test correction methods, and versatile filtering of enriched GO terms for more focused analyses. A unique graphic interface reflecting the GO tree structure was devised to facilitate comparisons of multiple GO analysis results, which can provide valuable insights for biological interpretation. Additional features to enhance user convenience include built in ID conversion, evidence code-based gene-GO association filtering, set operations of gene lists and enriched GO terms, and user -provided data files. It is available at http://neon.gachon.ac.kr/GoBean/.

• Biomedical Science Letters
• /
• v.12 no.4
• /
• pp.405-411
• /
• 2006

Heterotrimeric GTP binding proteins (G proteins) mediate signal transduction generated by neurotransmitter and hormones. Among G-proteins, Go is classified as a member of the Go/Gi family and the most abundant heterotrimeric G protein in brain. Most of the mechanistic analyses on the activation of Go indicated its action to be mediated by the $G{\beta}{\gamma}$ dimer because downstream effectors for its ${\alpha}$ subunit have not been clearly defined. To determine the downstream effectors of alpha subunits of Go ($Go{\alpha}$), we used yeast two-hybrid system to screen $Go{\alpha}$ interacting partners in cDNA library from the human brain. A brain specific high mobility group box containing protein (BHX), A possible transcription factor, was identified as a $Go{\alpha}$ interacting protein. We confirmed interaction between $Go{\alpha}$ and BHX employing in vitro affinity binding assay. Moreover, active form of $Go{\alpha}$ preferentially interacts with BHX than inactive farm. Our findings indicate that $Go{\alpha}$ could modulate gene expression via interaction with BHX during neuronal or brain development.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2012.10a
• /
• pp.7-10
• /
• 2012

In this thesis, Wi-Fi Direct which can communicate with other device without AP, we study how to be selected GO considering multi-user connection and we apply it to application. We give the weight how many time a device was GO and how many time the device connected with other devices in 24 hours. With this value, the device is selected to GO when other devices request the connection. We show that the application which we implemented select right GO.

• Journal of the Korean Institute of Telematics and Electronics
• /
• v.26 no.2
• /
• pp.41-55
• /
• 1989

Successive iteration of geometrical optics(GO)is suggested to calculate wedge diffraction fields. For a wedge and given source, the GO field may be obtained when the fields by the half spaces are found and the shadow regions are determined. Furthermore, one may caluculate the sources which are equivalent to the discontinuities of the GO field along the shadow boundaries and form a new wedge problem with the equivalent sources instead of the original one. It is shown that the field by the wedge and the equivalent sources equals to the diffraction field which GO requires for the complete solution. Also, it is shown that the field generated by the equivalent sources in the unbounded space, or the incident field in the new wedge problem, equls to the diffraction field approximated by the physical optics. The new wedge problem is solved here by another application of the GO to approximate the diffraction field and the result is compared with that by the physical optics. For a validity of the successive iteration of GO , infinite iteration of GO is performed analytically and the convergence is examined ofr conducting wedges, of which the exact solution is available.

• Polymer(Korea)
• /
• v.38 no.2
• /
• pp.232-239
• /
• 2014

Poly(lactic acid)(PLA) nanocomposites containing various nanofillers were synthesized using the solution intercalation method. Organically modified bentonite clay (NSE), octadecylamine-graphene oxide (ODA-GO), and an NSE/ODA-GO complex were utilized as nanofillers in the fabrication of PLA hybrid films. PLA hybrid films with varying nanofiller contents in the range of 0-10 wt% were examined and compared in terms of their thermomechanical properties, morphologies, and oxygen permeabilities. Transmission electron microscopy (TEM) confirmed that most of the NSE and ODA-GO nanofillers were dispersed homogeneously throughout the PLA matrix on the nanoscale, although some agglomerate NSE/ODA-GO complex particles were also formed. Among the three nanofillers for PLA hybrid films, the NSE/ODA-GO complex showed the best improvement in film thermal stability. In contrast, NSE and ODA-GO exhibited the best improvement in tensile mechanical properties and oxygen barrier properties of the PLA hybrid films, respectively.