山그늘

정민호 문예운동사 2009 문예운동 Vol.- No.104

배기열 회수용 종이 열교환기의 성능에 영향을 미치는 인자에 관한 연구

정민호,유성연 대한설비공학회 2005 설비공학 논문집 Vol.17 No.10

In order to control indoor air quality and save energy, it is needed to install a suitable ventilation system equipped with heat exchanger for heat recovery. The purpose of this research is to find the factors affecting the performance of paper heat exchanger for exhaust heat recovery, which can be applied directly to the conventional ventilation unit, air- purifier, and air-conditioning system. In this study, thermal performance and pressure loss of the paper heat exchanger are measured and compared at various operating conditions. The effectiveness of sensible, latent and total heat at the face velocity of 0.75m/s are 77%, 47% and 57% in the cooling condition and 77%, 59% and 69% in the heating condition, respectively. The effectiveness for sensible heat is only affected by velocity. On the other hand, the effectiveness for latent heat is affected by temperature and relative humidity.

생쥐 대식세포에 대한 SNP의 Apoptosis 유발 효과

정민호,이상화,서수영,송진미,김화숙,박선미,이성태,윤식 大韓免疫學會 1996 大韓免疫學會誌 Vol.18 No.3

Endogenously generated Nitric oxide(NO) redox species by the activation of inducible NO synthase(iNOS) induce apoptotic cell death in macrophages. In this experiments to exclude possible interference with NOS induction, we examined the ability of NO generating compound, sodium nitroprusside(SNP) to induce apoptotic cell death of murine macrophages(J774A.1, RAW 264.7, and thioglycollate-induced peritoneal macrophage). The induction of apoptosis was sup-ported by the absence of significant trypan blue staining but the occurrence of biochemical and morphological apoptotic markers of the increased DNA fragmentation. For the quantitation of apoptosis we used relatively simple and effective method, diphenylarnine(DPA) colorimetric as-say which was confirmed by DNA ladder and TUNEL stain. Incubation of J774A.1 macrophages with increasing concentrations of SNP(0.5-3mM) for 8 hr led to concentration de-pendent apoptotic response, but with higher concentrations cell viability and DNA fragmentation started to decline. Apoptosis was rapid at 1mM and 2mM SNP in J774A.l macrophages, yielding specific DNA fragmentation after 4 and 3 hr with no further increase or slight decrease in fragmentation after 8 and 10 hr, respectively. As the concentration of SNP was increased, the time course of apoptosis was shortened. Increased apoptotic cells of late stage cause decreased cell viability and DNA fragmentation by the loss of cell membrane integrity and DNA de-gradation. As a results incubation with 1mM SNP for 5 hr is sufficient to induce apoptosis in J 774A.1 macrophages. Detailed kinetic studies revealed that there was no direct correleation between nitrite(NO2-) accumulation and death-eliciting potency. Nitrite , a final NO oxidation product, cannot correlated with various NO-related redox forms possibly involved in a apoptotic signaling. In different murine macrophage cell line, RAW264.7, apoptosis was also induced by the incubation of 1mM SNP for 5 hr and the response was not inhibited by the addition of 1mM NG-monomethyl-L-arginine(NMMA), establishing a definite link between exogenously applied NO and apoptotic cell death. In contrast to cell lines there was no induction of apoptosis in peritoneal macrophages and J774A.1 cultured with thioglycollate. Angry state of thioglycollate induced in-Rammed macrophages may suppress NO-induced apoptosis compared to fully activated ma-crophages which express a high level of iNOS, produce large quantities of NO, and perform self destruction. The balance between apoptosis-promoting and opposing signals may regulate the susceptibility of macrophages to NO-mediated apoptosis. Therefore under inflammatory conditions, there may be a tendency to maintain cytotoxic activities of macrophages against pathogens before elimination of activated macrophages by an apoptotic process after massive stimulation.

경주신라 천년의 고도 , 경주

정민호 대한지방행정공제회 1984 도시문제 Vol.19 No.9

Effective Reduction of Leakage Currents in Single-walled Carbon-nanotube-network Thin-film Transistors

정민호,최은석,이건학,김진오,김아성,천성우,임채현,이승백 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.52

We report on the dependence of the reduced metallic percolation paths of single-wall carbonnanotube-network thin-films (SCNTFs) on the channel aspect ratio and the number of strips (N_(strip)). A longer channel length (L_C) and the existence of strips in the channel region limit the number of metallic percolation conducting paths existing between the source and the drain in SCNTF transistors. Increasing the channel aspect ratio threefold resulted in an increase in the on/off current ratio (I_(on)/I_(off)) by 246%. We also observed that introducing 15 strips into the channel increased I_(on)/I_(off) by 859%, which was attributed to a reduction in the number of metallic percolation paths formed between the source and the drain. The results show that with a higher aspect ratio and with strips introduced into the channels, the semiconducting behavior of solution-processed SCNTF transistors can be enhanced.

A Network Coding-Aware Routing Mechanism for Time-Sensitive Data Delivery in Multi-Hop Wireless Networks

정민호,안상현 한국정보처리학회 2017 Journal of information processing systems Vol.13 No.6

The network coding mechanism has attracted much attention because of its advantage of enhanced networkthroughput which is a desirable characteristic especially in a multi-hop wireless network with limited linkcapacity such as the device-to-device (D2D) communication network of 5G. COPE proposes to use the XORbasednetwork coding in the two-hop wireless network topology. For multi-hop wireless networks, theDistributed Coding-Aware Routing (DCAR) mechanism was proposed, in which the coding conditions for twoflows intersecting at an intermediate node are defined and the routing metric to improve the codingopportunity by preferring those routes with longer queues is designed. Because the routes with longer queuesmay increase the delay, DCAR is inefficient in delivering real-time multimedia traffic flows. In this paper, wepropose a network coding-aware routing protocol for multi-hop wireless networks that enhances DCAR byconsidering traffic load distribution and link quality. From this, we can achieve higher network throughput andlower end-to-end delay at the same time for the proper delivery of time-sensitive data flow. The Qualnet-basedsimulation results show that our proposed scheme outperforms DCAR in terms of throughput and delay.

새봄에 거는 기대

정민호 문예운동사 2009 문예운동 Vol.- No.101

창상에 의한 예수님의 장기 손상에 관한 추정

정민호,강여울,이진숙,박대성,조원길,최병영,양영철,조병필 대한체질인류학회 2017 대한체질인류학회 학술대회 연제 초록 Vol.60 No.-

복시를 호소하는 다계통위축증 환자 치험 1례

정민호,손정화,조기호,문상관,권승원,정우상,Jung, Min-ho,Son, Jeong-hwa,Cho, Ki-ho,Mun, Sang-kwan,Kwon, Seung-won,Jung, Woo-sang 대한한방내과학회 2017 大韓韓方內科學會誌 Vol.38 No.2

In this study, a 54-year-old female woman diagnosed as Multiple System Atrophy (MSA) presented diplopia with other symptoms - gait disturbance, ataxia, sleep apnea, dysuria. She had been cared with Korean medical treatment - Herbal medicine, acupuncture, bee venom acupuncture, electroacupuncture, cupping, moxa. Notable improvement was observed in diplopia expressing time and Unified Multiple System Atrophy Rating Scale (UMSARS). For MSA patient with no typical treatment indispensable, Korean medical treatment may be effective.

Effect of Voltage on the hydrogen ion concentration in CDI module for lithium recovery from briksh water

정민호,강기원,황택성 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1

In this study, it was to develop an industrial type CDI module and to evaluate the performance of the module for brackish water desalination. Electrodialysis (ED) was an interesting technique developed for recovering and purifying salts and acids from fermentation broths. But ED process uses the chemicals; HCl, etc. Hence, in this system was using chemical free process. Because bipolar membrane (BPM) was used in the ED process. BPM has function at a constant voltage to split water into hydrogen ions and hydroxyl ions. And then this process was in need of hydrogen ion for recovery lithium ion from Lithium manganese oxide (LMO). So in this study was observed the effect of the voltage on the hydrogen ion concentration.