온수배관을 이용한 온실의 난방성능

윤용철(Yong Cheol Yoon),신익수(Yik Soo Shin),김현태(Hyeon Tae Kim),배승범(Seoung Beom Bae),최진식(Jin Sik Choi),서원명(Won Myung Suh) (사)한국생물환경조절학회 2012 생물환경조절학회지 Vol.21 No.2

본 연구는 온실의 난방 에너지 절감을 목적으로 온실 내부에 알루미늄 온수배관을 설치하여 난방효과에 대한 기초자료를 구축하고자 수행되었다. 그 연구결과를 요약하면 다음과 같다. 전체 실험을 포함하여 온실내의 높이별 온도편차는 4.0~7.0℃ 정도의 범위로서 그 차이가 크게 나타났다. 팬코일유니트(FCU)를 작동시킨 경우가 작동시키지 않은 경우에 비해 유출입수의 온도차가 3.3℃ 정도 크고, 소비전력량은 36.2~40.1% 정도 증가하였으며, 시간당 방열량은 44.6~52.0% 정도 증가하는 것으로 나타났다. 실험기간동안 순환유량은 0.48~0.49L · s<SUP>?1</SUP> 정도의 범위에 있었고, 평균유속은 1.53~1.56m · s<SUP>?1</SUP> 정도였다. 유출입수의 평균 온도차는 6.24~11.50℃이었다. 최저 외기온 ?14.0~?0.6℃ 범위에서 설정온도별 방열량은 135,930~307,150㎉ 정도의 범위로서 시간당 9,610~19,630㎉ · h<SUP>?1</SUP> 정도의 범위에 있었다. 이것은 최대난방부하의 약 23~53% 정도의 난방에너지를 공급할 수 있을 것으로 나타났다. 전체 방열량과 소비전력량은 각각 2,548,306㎉ 및 3,075.7㎾h이다. 화석연료인 경유로 난방할 경우, 소요되는 경유의 총 소비량은 281.6L 정도이고 비용은 321,000won인 것으로 나타났다. 농가용 전력요금을 적용하면 전력사용에 대한 총비용은 110,730won 정도로서 경유 소비 비용의 33.5% 정도로 나타났다. 실험구의 온도가 대조구보다 약 8.3~14.6℃ 정도 높게 나타났다. This research was conducted to obtain basic data with regard to the heating performance that would be produced by installing an aluminum hot water pipe inside the greenhouse with the goal of reducing the heating energy in greenhouse. The research results are summarized as follows. The degree of difference in relation to the temperature by height within the greenhouse during the entire experiment was significant - within the range of 4.0~7.0℃. The temperature difference between incoming and outgoing water was about 3.3℃ greater when FCU was activated compared to when it was not activated. Meanwhile, the amount of energy consumed increased about 36.2~40.1%. The amount of pyrexia per hour also increased by 44.6~52.0%. During the experiment period, circulated flux was within the range of 0.48~0.49 L · s<SUP>?1</SUP> while average fluid speed was 1.53~1.56 m · s<SUP>?1</SUP>. The average temperature difference between incoming and outgoing water was 6.24~11.50℃. The amount of heating value by each set temperature within the minimum outdoor temperature range of ?14.0~?0.6℃ was 135,930~307,150 ㎉, and the range was within the 9,610~19,630 ㎉ · h<SUP>?1</SUP> per hour. This demonstrated that about 23~53% heating energy of the maximum heating load could be supplied. Total radiating value and amount of energy consumed were 2,548,306 ㎉ and 3,075.7 ㎾h, respectively. When heating takes place using oil, which is a fossil fuel, the total amount of light oil consumed was 281.6 L while the cost was 321,000 won. When the electricity cost for farms is applied, the total cost was about 110,730 won, which is about 33.5% of the cost required compared to oil consumption. The temperature at in the experiment area was about 8.3~14.6℃ higher compared to that of the control area.

Two Cases of Severe Plasmodium falciparum Malaria Complicated with Acute Respiratory Distress Syndrome

Choi, Su Mi,Lee, Youn Jeong,Park, Sun Hee,Koh, Myoung Beom,Kim, Sang Il,Kim, Yang Ree,Kim, Young Kyoon,Kang, Moon Won 대한감염학회 2001 감염 Vol.33 No.5

말라리아는 세계적으로 가장 흔한 감염질환의 하나로, 우리나라에서도 유행지역으로의 여행객과 파견근무하는 사람들이 많아짐에 따라 열대열 말라리아에 감염되는 환자의 수가 증가하고 있다. 열대열 말라리아는 급속한 진행을 보이며, 주요 장기 부전의 합병증을 동반하는 경우 적절한 치료에도 사망률이 20%에 이르는 내과적 응급질환으로 빠른 진단과 조기 치료가 중요하다. 특히 열대열 말라리아에서 비심인성의 수액 과부하 없이 나타나는 폐 부종은 뇌형 말라리아, 급성 신부전, 고말라리아혈증과 잘 동반되며, 치료가 지연되거나 치료와 관련되어 나타날 수도 있다. 최근 저자들은 열대열 말라리아에 다장기부전과 비심인성 폐부종으로 인한 급성호흡곤란증후군이 합병된 1예와 폐부종으로 인한 급성 폐손상이 합병된 1예를 경험하였기에 문헌 고찰과 함께 보고하는 바이다. 첫번째 증례는 태국에 한달간 골프여행을 다녀온 후 발병된 중증 열대열 말라리아로 과빌리루빈혈증, 혈소판감소증, 의식저하, 신부전 등의 다장기 부전과 폐부종에 의한 급성호흡 곤란증후군이 합병되어 quinine, doxycycline을 투여 받으면서 혈액투석과 인공호흡기로 치료받았으며, 이후 폐에 이차감염이 의심되어 항생제 치료 후 회복되었던 환자이고, 두번째 증례는 아프리카 가나에 선교활동을 다녀온 후 열대열 말라리아를 진단 받은 예로 빈혈, 혈소판감소증을 보이며, quinine으로 치료 중 착란 증상과 폐부종에 의한 급성 폐손상 소견을 보였던 환자로 산소요법과 이뇨제 등으로 치료 후 후유증 없이 완쾌되었던 예이다. (Korean J Infect Dis 33:354∼359, 2001)

The Effects of Chunghyul-Dan, an Agent of Korean Medicine, on a Mouse Model of Traumatic Brain Injury

Choi, Won-Woo,Lee, Kyungjin,Lee, Beom-Joon,Park, Seong-Uk,Park, Jung-Mi,Ko, Chang-Nam,Bu, Youngmin Hindawi 2017 Evidence-based Complementary and Alternative Medic Vol.2017 No.-

<P>Chunghyul-Dan (CHD) is the first choice agent for the prevention and treatment of stroke at the Kyung Hee Medical Hospital. To date, CHD has been reported to have beneficial effects on brain disease in animals and humans, along with antioxidative and anti-inflammatory effects. The aim of this study was to evaluate the pharmacological effects of CHD on a traumatic brain injury (TBI) mouse model to explore the possibility of CHD use in patients with TBI. The TBI mouse model was induced using the controlled cortical impact method. CHD was orally administered twice a day for 5 d after TBI induction; mice were assessed for brain damage, brain edema, blood-brain barrier (BBB) damage, motor deficits, and cognitive impairment. Treatment with CHD reduced brain damage seen on histological examination and improved motor and cognitive functions. However, CHD did not reduce brain edema and BBB damage. In conclusion, CHD could be a candidate agent in the treatment of patients with TBI. Further studies are needed to assess the exact mechanisms of the effects during the acute-subacute phase and pharmacological activity during the chronic-convalescent phase of TBI.</P>

A Study of the Contaminated Sediment Management System in Korea, with Suggestions for Improvement

Choi, Jin Young,Kim, Suk Hyun,Won, Eun-Ji,Yang, Dong-Beom,Chung, Chang Soo,Kim, Kyoungrean,Choi, Ki Young,Ra, Kongtae,Kim, Kyung-Tae,Yim, Jee Young,Lim, Chae Woon,Hong, Gi Hoon BioOne (Coastal Education and Research Foundation) 2018 JOURNAL OF COASTAL RESEARCH Vol.85 No.special

Antineutrophil Cytoplasmic Antibody-Associated Vasculitis in Korea: A Narrative Review

Choi, Chan-Bum,Park, Yong-Beom,Lee, Sang-Won Yonsei University College of Medicine 2019 Yonsei medical journal Vol.60 No.1

<P>Antineutrophil cytoplasmic antibody-associated vasculitis (AAV) is a group of systemic necrotising vasculitides, which often involve small vessels, and which lead to few or no immune deposits in affected organs. According to clinical manifestations and pathological features, AAV is classified into three variants: microscopic polyangiitis, granulomatosis with polyangiitis (GPA), and eosinophilic GPA. The American College of Rheumatology 1990 criteria contributed to the classification of AAV, although currently the algorithm suggested by the European Medicines Agency in 2007 and the Chapel Hill Consensus Conference Nomenclature of Vasculitides proposed in 2012 have encouraged physicians to classify AAV patients properly. So far, there have been noticeable advancements in studies on the pathophysiology of AAV and the classification criteria for AAV in Western countries. However, studies analysing clinical features of Korean patients with AAV have only been conducted and reported since 2000. One year-, 5 year-, and 10 year-cumulative patient survival rates are reported as 96.1, 94.8, and 92.8%. Furthermore, initial vasculitis activity, prognostic factor score, age and specific organ-involvement have been found to be associated with either all-cause mortality or poor disease course. The rate of serious infection is 28.6%, and 1 year-, 5 year- and 10 year-cumulative hospitalised infection free survival rates range from 85.1% to 72.7%. The overall standardised incidence ratio of cancer in AAV patients was deemed 1.43 compared to the general Korean population.</P>

<i>Rubus occidentalis</i> analgesic effect in a rat model of incisional pain

Choi, Geun Joo,Kang, Hyun,Kim, Won Joong,Kwon, Ji Wung,Kim, Beom Gyu,Choi, Yoo Shin,Cha, Young Joo,Ko, Jin Soo Academic Press [etc.] 2016 The Journal of surgical research Vol.206 No.1

<P><B>Abstract</B></P> <P><B>Background</B></P> <P>The purpose of this study was to evaluate the analgesic effect of <I>Rubus occidentalis</I> extract (ROE) in a rat model of incisional pain. The involved mechanisms and proinflammatory cytokine response were also examined.</P> <P><B>Materials and methods</B></P> <P>To investigate the analgesic effect, rats were intraperitoneally administered with normal saline or various doses of ROE before or after a plantar incision. To evaluate the involved mechanism, rats were intraperitoneally administered yohimbine, dexmedetomidine, prazosin, naloxone, atropine, or mecamylamine after a plantar incision; ROE was then administered intraperitoneally. The mechanical withdrawal threshold (MWT) was tested with von Frey filaments at various time points. To determine the inflammatory response, serum levels of interleukin (IL)-1β or IL-6 were measured.</P> <P><B>Results</B></P> <P>The MWTs significantly increased at 15 min after postincisional administration of 300 mg/kg ROE when compared with those in the control group. This elevation was observed for up to 45 min. Overall, MWTs increased in proportion to ROE dosage; however, ROEs administered before the incision produced no significant change in the MWT. The analgesic effect of ROE was significantly antagonized by mecamylamine, naloxone, and yohimbine, and agonized by dexmedetomidine. Administration of ROE inhibited the postincisional increase in serum IL-1β and IL-6.</P> <P><B>Conclusions</B></P> <P>Intraperitoneal administration of ROE after surgery induces antinociceptive effects in a rat model of postoperative pain, and its effects on mechanical hyperalgesia may be associated with α<SUB>2</SUB>-adrenergic, nicotinic cholinergic, and opioid receptors.</P>

Doped porous carbon nanostructures as non-precious metal catalysts prepared by amino acid glycine for oxygen reduction reaction

Choi, In-Ae,Kwak, Da-Hee,Han, Sang-Beom,Park, Jin-Young,Park, Hyun-Seok,Ma, Kyeng-Bae,Kim, Do-Hyoung,Won, Ji-Eun,Park, Kyung-Won Elsevier BV 2017 Applied Catalysis B Vol.211 No.-

<P><B>Abstract</B></P> <P>To replace Pt-based catalysts for oxygen reduction reactions in polymer electrolyte membrane fuel cells, various carbon nanostructures doped by transition metals and heteroatoms have been investigated. In this study, we synthesized bi-modal porous iron and nitrogen doped carbon nanostructures as non-precious metal catalysts using glycine as a dopant and carbon source in the presence of iron salt. The samples exhibited a bi-modal porous structure consisting of macro- and meso-pores of 500 and 20nm, respectively, and specific surface areas of 214–740m<SUP>2</SUP> g<SUP>−1</SUP>, which facilitate electrochemical reactions due to increased amounts of electrochemical active sites and favorable mass transport. Furthermore, the porous carbon nanostructures showed considerable amounts of dopants, high crystallinity, and excellent electrical conductivity. Especially, the sample prepared using 500 and 20nm silica beads with both glycine and iron salt showed improved catalytic activity in both acidic and alkaline media comparable to that of a commercial Pt catalyst.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Porous N and Fe doped carbon catalysts were prepared using silica beads template. </LI> <LI> Amino acid glycine was utilized as the C and N sources for the catalyst synthesis. </LI> <LI> The catalyst showed high ORR activity in both acid and alkaline media. </LI> <LI> The high ORR activity was attributed to a well-doped porous carbon nanostructure. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Low serum complement 3 level is associated with severe ANCA-associated vasculitis at diagnosis

Choi, Hyeok,Kim, Youhyun,Jung, Seung Min,Song, Jason Jungsik,Park, Yong-Beom,Lee, Sang-Won Tokyo; OCC Japan 2019 CLINICAL AND EXPERIMENTAL NEPHROLOGY Vol.23 No.2

Nitrogen-doped bi-modal porous carbon nanostructure derived from glycine for supercapacitors

Choi, In-Ae,Kwak, Da-Hee,Han, Sang-Beom,Park, Kyung-Won THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.63 No.-

<P><B>Abstract</B></P> <P>We prepared a nitrogen-doped bi-modal porous carbon nanostructure (G-500/20) using a template method with 500 and 20nm SiO<SUB>2</SUB> beads and glycine. The G500/20 has a surface area of 403m<SUP>2</SUP> g<SUP>−1</SUP> with meso/macroporous structure and N-doping content of 5.9at%. In the supercapacitor performance, G-500/20 exhibits superior specific capacitances of 19.5 and 5.3Fg<SUP>−1</SUP> at 200mVs<SUP>−1</SUP> and 20Ag<SUP>−1</SUP> in 6M NaOH, compared to a commercial activated carbon. In particular, the superior capacitances of G500/20 at high scan rates and current densities were achieved due to the bi-modal porous structure and nitrogen doping effect.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We prepared a nitrogen-doped bi-modal porous carbon nanostructure (G-500/20). </LI> <LI> G500/20 has a meso/macroporous structure and N-doping content of 5.9at%. </LI> <LI> G-500/20 exhibits superior specific capacitance, compared to activated carbon. </LI> <LI> The superior capacitance resulted from the N-doped bi-modal porous structure. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Chemical Vapor Deposition Carbon Film as a Capping Layer in 4H-SiC Based MOSFETs

Choi, Kyeong-Keun,Lee, Jeong-Yoon,Lee, Won-Beom,Kim, Deok-Kee,Park, Chan-Gyung American Scientific Publishers 2018 Journal of Nanoscience and Nanotechnology Vol.18 No.9