유가변동이 에너지효율성에 미치는 영향 분석: 우리나라 제조업의 에너지 절약투자액을 중심으로

양경철,권오성,Yang, Kyung-Chul,Kwon, O-Sung 한국국방경영분석학회 2009 한국국방경영분석학회지 Vol.35 No.2

에너지는 기업이 생산활동을 하는데 필수불가결한 요소이다. 그렇다면 에너지 가격이 상승할 때 기업의 이윤이 감소하지 않기 위한 조건은 무엇인가? 결론적으로 말해서 에너지 가격 변화율에 따른 생산성 향상 변화율이 총매출액 대비 에너지 비용보다 클 경우 기업은 에너지 가격의 상승으로 인한 충격을 피할 수 있다. 또한 기업이 에너지 비용을 낮춘다는 것은 에너지 효율성을 향상시킨다는 것이다. 이에 본 연구에서는 우리나라 제조업에서 유가의 상승이 에너지절약투자에 미치는 영향과 에너지절약투자가 에너지효율성에 미치는 영향을 분석하였다. 이를 통해서 에너지 가격의 상승에 따른 에너지 효율성의 변화와 그 요인을 함께 분석할 수 있다는 데에 본 연구의 의의를 두고자 한다. Energy is essential factor of production for a firm to produce goods and services. If so, what is the condition of maintaining profit of a firm when energy price is going up? In conclusion, the condition is that the rate of productivity improvement should be greater than the rate of energy price increase. To put this concretely, when the elasticity of energy price as to the productivity improvement is greater than the weight of the energy cost on to the total revenue of the firm, the firm can escape the negative effect of energy price increase. This is that, saying that once more, the firm have to reduce the energy cost or promote energy efficiency to maintain appropriate or sufficient profit when energy price is going up fast. Therefore, in this study we will analyze the effect of the oil price increase on the energy saving investment and that of energy saving investment on the energy efficiency in the field of Korean manufacturing industry. In doing so, this study could show that the effect of energy price increase on the energy efficiency of the firm and the factor of that mechanism.

장수촌 지역 음용수의 물리화학적 특성

양경철 ( Kyung Chul Yang ),전경수 ( Kyung Soo Chun ),이덕수 ( Duk Soo Lee ),류재근 ( Jae Keun Ryu ) 한국환경분석학회 2008 환경분석과 독성보건 Vol.11 No.3

이온성 액체 1-ethyl-3-methylimidazolium tetrafluoroborate (EMI-BF4)의 합성과 정제에 관한 분석 연구

양경철(Kyung-Chul Yang),이영환(Young-Hwan Lee) 한국분석과학회 2011 분석과학 Vol.24 No.6

개의 출생 후 중추신경계통 발달에서 Platelet-derived growth factor α-receptor (PDGF-αR)의 발현

윤상필(Sang-Pil Yoon),전제열(Jae-Yeoul Jun),유호진(Ho-Jin You),김주영(Joo-Young Kim),양경철(Kyung-Chul Yang),안병수(Byung-Soo Ahn),장인엽(In-Youb Chang) 대한해부학회 2003 Anatomy & Cell Biology Vol.36 No.1

Platelet-derived growth factor (PDGF)는 민무늬근육세포, 섬유모세포, 아교세포 등의 분열능력에 상당한 영향을 미치고, 세포의 분열 및 분화의 유도, 조직손상의 복구, 염증, 종양형성 등에 관여하며, 신경계통에서는 주로 아교세포계열의 발생에 중요한 기능을 수행하는 것으로 알려져 왔다. 배자의 출생 후 발달중인 신경원에는 PDGF-αR가 존재하지 않는다는 주장들이 대부분이고, 또 PDGF-αR이 성숙한 신경원에 존재한다는 최근 보고는 생쥐의 신경원에서 밝혀냈을 뿐이다. 따라서 고등포유동물인 개의 중추신경계통에서 출생 후 발달에 따른 PDGF-αR양성신경원의 존재 양상을 밝혀내고자 면역조직화학염색을 실시하여 다음과 같은 결과를 얻었다. 대뇌겉질의 속피라밋층, 해마와 치아이랑의 피라밋세포 및 과립세포, 줄무늬체의 창백핵, 조가비핵, 꼬리핵, 시상의 배쪽앞쪽핵, 그물핵, 가쪽무릎체, 뒤쪽시상하부핵, 흑색질, 얼굴신경핵, 안뜰핵, 삼차신경핵 등의 뇌줄기핵, 소뇌의 조롱박세포와 과립세포, 척수의 뒤뿔과 앞뿔 등 여러 부위에서 출생 0일부터 PDGF-αR의 염색반응을 보이는 신경원들을 관찰할 수 있었는데, 이들은 출생 후 6개월까지 지속적으로 관찰되었다. PDGF-αR의 염색반응양상은 대체로 출생 후 1개월까지 세포의 가지돌기 및 축삭에 잘 표지되었지만, 그 이후 신경세포의 염색성과 숫자가 감소되는 경향을 보이며, 출생 후 6개월까지 발현을 확인할 수 있었다. 이상의 실험결과로 미루어 출생 후 6개월까지 발달과정동안 개 중추신경계통에서 PDGF-αR양성신경원이 지속적으로 존재한다는 것을 알 수 있었으며, 이로서 PDGF가 중추신경계의 특정부위에 있는 신경원의 성숙에 관여한다고 사료된다. Platelet-derived growth factor (PDGF) was initially described for its mitogenic activity on smooth muscle cells, fibroblast, and glial cells. The biological activities of PDGF include stimulation of mitogenesis, differentiation, wound healing, inflammation, and tumor formation. The localization of platelet-derived growth factor-α receptor (PDGF-αR) in central nervous system was commonly restricted to oligodendrocyte progenitors during late embryonic and postnatal development. However, several studies recently demonstrated that postnatal neurons could also synthesize PDGF-αR in rodents. In the present study, to analyze the distributional pattern of PDGF-αR during postnatal development of the canine CNS, we used immunohistochemical method on sections of canine brain tissue. We found that neurons of various CNS regions, including cerebral cortex, striatum, diencephalon, nuclei of brain stem, cerebellum, spinal cord, exhibited the immunoreactivity to PDGF-αR as early as postnatal day 0. Generally PDGF-αR immunoreactivity was well localized in the dendrites and axons of neuron during the postnatal day 14 and postnatal day 28, and then showed diminished pattern. But neuronal immunoreactivity to PDGF-αR were maintained postnatal 6 month. These results suggest that the localization of PDGF-αR in postnatal developing neurons supports the several roles of PDGF for neurons including maturation and survival.

생쥐 위장관의 Interstitial cells of Cajal(ICC)에 대한 면역조직화학적 연구

김영철,차경훈,신무경,임건한,김주영,안병수,김장만,양경철,박도영,오재욱,장인엽 조선대학교 2003 The Medical Journal of Chosun University Vol.28 No.1

Background and Objectives : Interstitial cells of Cajal(ICC) are the pacemakers in gastrointestinal tract that modulates gastrointestinal motiliey and these cells also transmit neural input from enteric nerves to smooth muscles. Recent work on tissues from patients with motility disorders that suggest that loss or defect in ICC could be related to pathophysiology in human and animal models. Immunolabelling of ICC in intestinal wall is recently developed by using specific marker, anti-c-kit antibody. Immunohistochemistry was done for ICC network in attempt to provide a morphological basis for the mechanism regulating gastrointestinal motility Methods : Cryosection was done, and whole-mount preparations of mouse stomach, gastrointestinal tract were immunolabelled using the anti-c-Kit. Immunolabelled ICC networks were observed under a confocal laser scanning microscopy. Results : According to three dimensional reconstruction study, we found that the c-Kit-positive celluar networks were widely distributed in the gastrointestinal muscle (1) circular muscle layer(IC-IM), (2) myenteric plexus(IC-MY), (3) deep muscular plexus(IC-DMP) in ileum, (4) submucosal plexus(IC-SMP) and longitudinal muscle layer(IC-LM) in colon. Conclusion : The characteristic profiles of ICC celluar networks provide a morphological basis upon the mechanism regulating gastrointestinal motility. Additional studies for the enteric nerves-ICC interaction are need to evaluate the detailed roles of Icc in gastrointestinal tract.

생쥐 대장 평활근에서 막전압-의존성 이온 전류에 대한 tamoxifen 효과

박찬국,허광식,장성종,김만우,윤영,박도영,양경철,신무경,차경훈,염철호,윤평진,전제열 조선대학교 2003 The Medical Journal of Chosun University Vol.28 No.1

Background and Objectives : Tamoxifen is a widely used anticancer drug for breast cancer causing frequent gastrointestinal side effects. The change of gastrointestinal motility is associated with the alteration of activities of membrane ion channels. The ion channel is found to play an important role in regulating membrane potential and cell excitability. This study was performed to investigate the effects of tamoxifen on the membrane ionic currents in colonic myocytes. Materials and Methods : Single colonic myocytes were isolated by using a collganase from murine proximal colon. The membrane currents were recorded by using a whole-cell patch clamp method at room temperature. Results : Two types of voltage-dependent K+ currents (A-type and delayed rectifier K+ currents) were recorded. Tamoxifen inhibited both types of voltage-dependent K+ currents (10 μM). However, tamoxifen did not change the half-inactivation potential and the recovery time of voltage-dependent K+ currents. Chelerythrine, a protein kinase C inhibitor, and phorbol-12,13-dibutyrate, a protein kinase C activator, did not affect the voltage-dependent K+ currents Guanosine 5-O-2-thiodiphosphate (GDPβS, a G-protein inhibitor), also did not affect on tamoxifen-induced inhibition of voltage-dependent K+ currents. In audition, tamoxifen completely inhibited the voltage-dependent Ca²+ currents in whole-test ranges. Conclusion : These results suggest that tamoxifen inhibits the voltage-dependent membrane ionic currents in colonic smooth muscle cells, and that this action may be relevant to the gastrointestinal side effects