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Theory study on thermal performance of metal foam
Jin Meihua,Pilhwan Kim,Haejong Lee,Hyomin Jeong,Hanshik Chung 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
In many literatures the researchers pointed out that the using metal foam will significantly enhance the performance of heat exchanger. This paper focuses on theory study of metal foam, including calculation method of properties of foam (permeability ?, inertial coefficient f, fiber diameter d<SUB>f</SUB>, and effective conductivity k<SUB>e</SUB>), model of pressure drop and model of heat transfer. Theory analysis on the performance of heat exchanger will be presented here. Finally the optimal material will be obtained from theory calculation.
A study on the characteristic of porous media
Jin Meihua(진미화),Pilhwan Kim(김필환),Hyomin Jeong(정효민),Hanshik Chung(정한식) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
since porous medium will increase the performance of heat exchanger, porous medium is of growing interest in a wide range of engineering. But as the penalty of increasing heat transfer coefficient ,increasing of pressure drop should be taken into consideration. This paper represent an experiment, which is to used measure α and β of two copper porous medium (20ppi and 40ppi) with different porosity. α and β are important factor of pressure drop. Finally we got the relationship equation between unit pressure drop and velocity.
Jin, Meihua,Yang, Ju Hye,Lee, Eunkyung,Lu, Yue,Kwon, Soonyoul,Son, Kun Ho,Son, Jong Keun,Chang, Hyeun Wook Pharmaceutical Society of Japan 2009 Biological & pharmaceutical bulletin Vol.32 No.9
<P>Previously, we reported that an ethanol extract of <I>Ailanthus altissima</I> has antiinflammatory activity in an ovalbumin (OVA)-sensitized murine asthmatic model. To determine the biological compounds from this plant, luteolin-7-<I>O</I>-glucoside (L7G) was isolated and its antiasthmatic activity was evaluated in an <I>in vivo</I> murine asthmatic model. L7G (10 to 100 mg/kg, <I>per os</I> (<I>p.o.</I>)) reduced the amount of eosinophil infiltration in bronchoalveolar lavage (BAL) fluid in a dose-dependent manner. In comparison, dexamethasone (5 mg/kg, <I>p.o.</I>), which was used as a positive control, also strongly inhibited the number of infiltrating eosinophils. L7G inhibited both the prostaglandin E<SUB>2</SUB> (PGE<SUB>2</SUB>) and serum immunoglobulin E level in BAL fluid in a dose-dependent manner. In addition, L7G inhibited the transcript profiles of interleukin (IL)-4, IL-5, and IL-13 mRNA expression levels in the murine asthma model, as determined using reverse transcription-polymerase chain reaction (RT-PCR). These results suggest that the antiasthmatic activity of L7G in OVA-induced lung inflammation may occur in part <I>via</I> the downregulation of T helper 2 cytokine transcripts as well as the inhibition of PGE<SUB>2</SUB> production.</P>
Graphene oxide thin film field effect transistors without reduction
Jin, Meihua,Jeong, Hae-Kyung,Yu, Woo Jong,Bae, Dong Jae,Kang, Bo Ram,Lee, Young Hee Institute of Physics [etc.] 2009 Journal of Physics. D, Applied Physics Vol.42 No.13
<P>Pristine graphene oxide thin film field effect transistors were fabricated on Si substrates without an additional reduction process. Graphene oxide with an optical band gap of 1.7 eV showed p-type semiconducting behaviour in air and ambipolarity under vacuum. The temperature dependence of conductance confirmed these semiconducting characteristics. <I>I</I>–<I>V</I> characteristics were well fitted to a variable range hopping model with 2 + 3 dimensionality, in good contrast to the 2D fitting in the reduced graphene oxide.</P>
Thermal Properties Calculation and Compare of LNG Using Nist Supertrapp and Hysys
Jin Meihua,Jin Zhenhua,Youngjin Kim,Hanshik Chung,Hyomin Jeong 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.10
Liquefied natural gas or LNG is natural gas that has been converted to liquid form for ease of storage or transport. Liquefied natural gas takes up about 1/600th the volume of natural gas at a stove burner tip. In this paper, we will list the properties of LNG at the scope of pressure and temperature from 80 bar to 130 bar, 108.15 K to 328.15 K using software Nist Supertrapp. Main properties are density, heat capacity, entropy, conductivity, enthalpy, viscosity, which are highly depended on pressure and temperature. In this paper we use two softwares to calculate the above properties, Nist Supertrapp and Hysys. To compare the difference between varies product regions, we choose Alaska, Alaska Brunei abdai Indonesia Malaysia Oman Karta, except Alaska other regions LNG have slightly different percentage of component. After presenting calculation result of Alaska LNG from software Nist Supertrapp, some difference between two softwares result will also be listed in figures.
Meihua Jin,Yan Wang,Tingting Zhou,Wenzhe Li,Qingping Wen 한국유방암학회 2023 Journal of breast cancer Vol.26 No.3
Purpose: Invasive ductal carcinoma (IDC) accounts for 90% of triple-negative breast cancer (TNBC). IDC is mainly derived from the breast ductal epithelium which is innervated by the 4th to 6th thoracic sympathetic nerves. However, little is known about the contribution of the interactions between sympathetic nerves and breast cancer cells to the malignant progression of TNBC. Methods: The expression levels of the β2-adrenergic receptor (β2-AR, encoded by ADRB2 gene), nerve growth factor (NGF), and tropomyosin receptor kinase A (TrkA) were determined using immunohistochemistry (IHC). NGF expression levels in the serum were compared by enzyme-linked immunosorbent assay (ELISA). Cell proliferation was assessed using the Cell Counting Kit-8 assay. The β2-AR, NGF, p-ERK, and p-CERB expression levels were determined using western blotting. TNBC cells and neuronal cells of the dorsal root ganglion (DRG) in 2-day-old Sprague Dawley rats were co-cultured. Using norepinephrine (NE), NGF, and β2-AR, NGF/TrkA blocker pretreatments, the axon growth of each group of DRG neuron cells was detected by immunofluorescence analysis. Results: The sympathetic adrenergic neurotransmitter NE activated the ERK signaling pathway in TNBC cells. NE/β2-AR signaling promotes NGF secretion. NGF further facilitates the malignant progression of TNBC by increasing sympathetic neurogenesis. In the co-culture assay, the sympathetic adrenergic NE/β2-AR signal pathway also enhanced NGF secretion. NGF binds TrkA in DRG neurons and promotes axonal growth. Conclusion: These results suggest that NE/β2-AR pathway promotes cell proliferation and NGF production in triple-negative breast cancer.
Study on the Optimum Thermal Performance of Metallic Foam Heat Exchanger
Meihua Jin(김미화 ),Myoungkuk Ji(지명국 ),Younhwan Lee(이윤환 ),Hanshik Chung(정한식 ),Hyomin Jeong (정효민 ) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
Since metallic foam will increase the performance of heat exchanger, it has caused many researchers' attention recently. Our research based on the model that metallic foams applied to heat exchanger. In this case, there is three kinds of heat transfer mechanisms, heat conduction in fibers, heat transfer by conduction in fluid phase, and internal heat change between solid and fluid phases. In this paper we study both the hydraulic and thermal aspect performance. Pressure drop along airflow direction will be presented. As thermal aspect, we first discuss the acceptance of applying thermal equilibrium among the two phases, then to calculate the dimensionless temperature profile, the heat transfer coefficient and Nu number in 7 Aluminum foams.
Jin, Meihua,Moon, Tae Chul,Quan, Zhejiu,Lee, Eunkyung,Kim, Yun Kyung,Yang, Ju Hae,Suh, Seok-Jong,Jeong, Tae Cheon,Lee, Seung Ho,Kim, Cheorl-Ho,Chang, Hyeun Wook Pharmaceutical Society of Japan 2008 BIOLOGICAL & PHARMACEUTICAL BULLETIN Vol.31 No.7
<P>Deoxypodophyllotoxin (DPT), a naturally occurring flavolignan with anti-inflammatory activity, was isolated from <I>Anthriscus sylvestris</I> <SMALL>HOFFM</SMALL>., and we examined its effects on the expression of inducible nitric oxide synthase (iNOS) in lipopolysaccharide (LPS)-stimulated, murine macrophage-like RAW264.7 cells. Western blot analysis performed with specific anti-iNOS antibodies showed that a decrease in nitric oxide (NO) was accompanied by a decrease in the iNOS protein level. To clarify the mechanistic basis for DPT's ability to inhibit iNOS induction, we examined the effect of DPT on nuclear factor (NF)-κB transcriptional activity and DNA binding activity. DPT potently suppressed both reporter gene activity and DNA binding activity. These findings suggest that DPT in RAW264.7 cells abolished LPS-induced iNOS expression by inhibiting the transcription factor, NF-κB.</P>
Jin, Meihua,Jeong, Hae-Kyung,Kim, Tae-Hyung,So, Kang Pyo,Cui, Yan,Yu, Woo Jong,Ra, Eun Ju,Lee, Young Hee Institute of Physics [etc.] 2010 Journal of Physics. D, Applied Physics Vol.43 No.27
<P>We describe the low-temperature thermal exfoliation of graphite oxide to obtain functionalized graphene sheets (FGSs). Graphite oxide, which is highly oxidized graphite produced by a modified Brodie method, is further exfoliated by a simple heat treatment at 270–275 °C under ambient Ar. The FGSs that are generated have fewer defects and less oxygen content than in commercial graphene sheets (GSs) prepared at high temperatures (>900 °C). X-ray photoelectron spectroscopy demonstrates a clear π-plasmon peak in the FGSs of the type that is seen in precursor graphite, but not in commercial GSs. Thus, our FGSs exhibit high 2D crystallinity and minimal defects.</P>
A study on the fluid flow characteristic of metal porous media
Jin Meihua,Pilhwan Kim,Hyomin Jeong,Hanshik Chung 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.11
Since porous medium will increase the performance of heat exchanger, porous medium is of growing interest in a wide range of engineering. But as the penalty of increasing heat transfer coefficient, increasing of pressure drop should be taken into consideration. This paper represent an experiment, which is to used measure α and β of two copper porous medium (20ppi and 40ppi) with different porosity. α and β are important factor of pressure drop. Finally we got the relationship equation between unit pressure drop and velocity.