초음파상 지방간 정도와 간기능 수치의 연관 관계

강희태,한석희,남정수,김미영 한국건강관리협회 2000 건협 Report Vol.3 No.-

아·태지역에서 위성서비스 연구

강민구,임종태,차준섭 호남대학교 정보통신연구소 1995 정보통신연구 Vol.4 No.-

최근 급격히 성장하고 있는 아·태지역에서 위성통신과 방송의 진출방향의 모색을 위해 현재 서비스중인 위성통신과 방송시스템의 현황을 파악한다. 이를 바탕으로 하드웨어 측면은 이지역에서 위성중계기의 수요·공급을 분석하고, 소프트웨어 측면은 이들 지역에서 다자간 공동 위성방송을 위한 시장특성 조사 및 문화교류의 연수를 통해 위성분야에서 우리나라의 진출방안을 논한다. In this thesis, the satellite services in the asia-pacific area are analyzed for the co-operation and development of satellite communication. By the estimation of satellite transponder's need, the trend of satellite technology and the Koreasat planning is expected for the enhancement of our technical position in this area. Through the analysis of the asia-pacific cultural characteristics to satellite broadcasting, new securable strategies against the foreign unprotectable satellite culture and realizable approaches for co-work with asia pacific countries under the ApⅡ (Asia-Pacific Information Infrastructure) are proposed.

F.A. Process에 의한 下水處理에 관한 硏究

姜龍太,柳在益,許宗文 東亞大學校 海洋資源硏究所 1989 硏究論文集 Vol.2 No.1

The purposes of this researches were to evaluate the effects of an advanced processes supplemented Conventional Activated Sludge Process and to invent the economical advanced process combined activated sludge process with FAC(Flocculation-Aeration-Clarification). Raw water used was synthetic wastewater. The primary treatment using the PAC process was effective in treating the wastewater with lower concentration. F.A process showed the removal rate of more than 90 percent without regard to variences of influent concentration.

牛糞과 窒素質 肥料 追肥水準에 따른 Italian ryegrass의 窒酸態 窒素 蓄積

姜泰鐘,許三男 全北大學校 附設 畜産開發硏究所 1991 畜産開發硏究報告 Vol.4 No.-

This study was conducted to investigate the influence of the level of cattle manure and nitrogen fertilization and cutting date on the nitrate accumulation in Italian ryegrass. Various nitrogen fertilizers(0, 10, 20㎏/10a) and cattle manure(0, 1, 2t/10a) were applied to Italian ryegrass and the experiment was performed at the field of Chonbuk National University in Chonju, from 1989 to 1990. The results obtained are summarized as follows ; 1) Significant difference were observed in nitrate concentration in Italian ryegrass as the levels of nitrogen fertilizers and cattle manure were increased(P<0.05). 2) Nitrate nitrogen contents were highest in 20㎏/10a of KNO3 plot shortly after 1st fertilization, but nitrate contents were very low in all treatments after the 2nd top dressing. 3) Nitrate contents in all treatments were dangerous to the livestock until 33days after 1st top dressing, but the contents were decreased to the safe level after 44days of the 1st top dressing. 4) The plots top-dressed with cattle manure kept very high in nitrate contents over 0.45%, dangerors level to the livestock throughout the experiment period. 5) Total nitrogen contents were the similar tendency to the nitrate content and the plots dressed with cattle manure were more or less 2% in nitrogen content. 6) Total DM yields were increased as the nitrogen fertilization were increased with highest yield in KNO_3, 20㎏/10a plot(1,249㎏/10a) and lowest in the plot of cattle manure(779㎏/10a).

KAL기 추락에 의한 대량재해의 개인식별

강신몽,이원태,고영창,최상규,김윤희,이홍석,서재관,윤중진,이혜경,최득린,김종열,윤창육,변명식,이장홍 大韓法醫學會 1991 대한법의학회지 Vol.15 No.2

Individual identification is an important part in medicolegal field especially in mass disaster. At July, 27, 1989, KAL KE-803 was crashed on landing at Tripoli International Airport, Liba. The plane was caught in fire and sixty eight Koreans were sacrified. The majority of victims were severely charred and injured. The authors examed all dead bodies and successfully identified all the cases through visual, anthropological, odontological, radiological and pathological methods including fingerprint and blood typing.

공원묘지 유실에 의한 대량재해의 개인식별

강신몽,이한영,윤중진,이원태,김종열,이영석,서재관,최득린,서지석,이혜경 大韓法醫學會 1992 대한법의학회지 Vol.16 No.1

Individual identification of severely decomposed or skeletonized bodies is an important part in medicolegal field. 142 bodies were torn up and carried away by flood in a park cemetry, Kwang-Ju, Kyunggi province, Korea at Sept., 10, 1990. The authors examed the 56 bodies, which were gained, through medical, anthropological, odontological, radiological methods, and superimposition for individual identification. Among them, 41 cases were successfully identified, and remaining 15 cases were not identified because of sever destruction and no adequate information.

양이온교환수지에 대한 Co(Ⅱ), Ni(Ⅱ), Cr(Ⅲ) 및 Fe(Ⅲ) 이온의 흡착 특성 : 원자로 일차 냉각재 계통내 탈염공정에의 적용 Application to the Demineralizing Process in a Primary Coolant System of PWR

강소영,이병태,이종운,문승현,김경웅 대한방사선 방어학회 2002 방사선방어학회지 Vol.27 No.1

가압경수로 일차냉각수내 탈염공정의 효과적 운용을 위하여 Amberlite IRN-77 양이온 교환수지의 특성 및 Co(II), Ni(II), Cr(III), Fe(III) 이온의 흡착거동을 연구하였다. 용존 금속이온 농도가 약 200 mgL^-1 인 용액 100 mL에 대하여 이온교환수지 투입량은 약 0.6g이 가장 적절하였으며, 이온교환 반응 속도 측정 결과 대부분의 흡착은 반응 1 시간 이내에 신속히 발생하였다. 수지에서의 양이온 교환은 Langmuir 흡착등온선을 잘 따르는 것으로 나타났으나, Fe(III)의 경우, 다른 금속과는 달리 쉽게 평형에 이르지 못하였으며 이는 공기와 오래 접촉한 결과 철산화물 또는 수산화물을 형성하며 용액 중으로부터 침전되기 때문인 것으로 관찰되었다. 전자가가 동일한 Co(II)와 Ni(II)가 동시에 포함된 모의 조제용액에 대하여 흡착실험을 한 결과, 각 이온은 거의 동일한 흡착 거동을 보였다. 그러나 전자가가 큰 Cr(III)이 첨가된 경우, 이들은 기존에 수지에 흡착되어 있던 전자가가 낮은 금속들을 탈착시키고 대신 흡착하는 경향을 보였다. 따라서 이온교환수지를 이용한 효과적인 탈염 공정을 위해서는 용존 금속 상호간의 경쟁적 흡착관계의 규명이 필요한 것으로 여겨진다. Characteristics of Amberlite IRN-77, a cation exchange resin, and the mechanisms of its adsorption equilibria with Co(II), Ni(II), Cr(III) and Fe(III) and Fe(III) ions were investigated for the application of the demineralizing process in the primary coolant system of a pressurized water reactor (PWR). The optimum dosage of the resin for removal of the dissolved metal ions at 200 mgL^-1 was 0.6 g for 100 mL solution. Most of each metal ion was absorbed onto the resin in an hour from the start of the reaction. Each metal adsorption onto the resin could be well represented by Langmuir isotherms. However, in the case of Fe(III) adsorption, continuous formation of Fe-oxide or -hydroxide and its subsequent precipitation inhibited the completion of the equilibrium between the metal and the adsorbent. Cobalt(II) and Ni(II), which have an equivalent electrovalence, were adsorbed to the resin with a similar adsorption amount when they coexisted in the solution. However, Cr(III) added to the solution competitively replaced Co(II) and Ni(II) which were already adsorbed onto the resin, resulting in desorption of these metals into the solution. The result was likely due to a higher adsorption affinity of Cr(III) than Co(II) and Ni(II). This implies that the interactively competitive adsorption of multi-cations onto the resin should be fully considered for an efficient operation of the demineralizing ion exchange process in the primary coolant system.

세라믹 종류에 따른 코어링 특성에 관한 연구

강용구,이태원,이종찬,최환 金烏工科大學校 産業技術開發硏究院 1999 産業技術開發硏究 Vol.15 No.-

A diamond core drill has been well carried out in the ceramics drilling. In this investigation, a vertical type machining center (MC) was used in the coring of Al₂O₃and Si₃N₄ceramics with a metal bonded diamond core drill. To clarify the mechanism of coring, the influences of coring conditions on the coring force, grinding ratio, succesive zone of coring were studied. At the wheel feed speed of 5.2 mm/min, and the wheel revolution of 3000rpm in Al₂O₃ceramics, the wheel speed of 2.7 mm/min, and the wheel revolution of 1500rpm in Si₃N₄ceramics, the best grinding ratio was obtained. But, from a viewpoint of coring speed, the wheel feed speed at 37 mm/min (Al₂O₃) and 10 mm/min (Si₃N₄) were best, when the coring depth was to 1 mm.

Bacillus sp. KCM-101에 의한 내열성 α-amylase의 생산 및 효소학적 성질

강상모,최유정,황윤영,이동희,권태종 건국대학교 산업기술연구원 2000 건국기술연구논문지 Vol.25 No.-

A strain isolated from soil was able to produce thermostable α-amylase. The strain (KC-101) was identification as Bacillus sp. Bacillus sp. KC-101 was treated NTG(N-methyl-nitro-nitrosoguanidine). The mutant KCM-101 increased α-amylase activity and decreased pretease activity. The condition for production, purification, and properties of α-amylase were investigated. α-Amylase production was maximized when was grown on soluble starch 2.0%, yeast extract 0.5%, K2HPO4 0.1% and MnCl2 0.02% for 24hrs at 37℃, and initial pH 7.0. The enzyme production was also increased by the addition of 0.01% Triton X-100. The enzyme was purified by ultrafiltration(MW 10,000), 80% ammonium sulfate precipitation, and Sephadex G-75 gel chromatography and it's yield 15.0%, The characteristics of purified α-amylase were as follow : MW 55,000, optimal pH and temperature were 7.0 and 95℃, respectively. The enzyme was activated by Ca++ and Mn++ ion but inhibited Co++, Cu++, Hg++, and Pb++ ion. The enzyme was stable at 95℃ and it's thermostability was greatly increased by the addition of Ca++. In kinetic studies, the Km value of α-amylase for soluble starch was 0.93mg/mL.

독성물질의 세포사 기전 및 세포사 유발물질의 검색법 개발에 관한 연구(Ⅰ) : 독성물질로 인한 파킨슨병 모델에서의 세포사 기전 연구 Study on the cell-death mechanisms of toxin-induced parkinsonism

강태석,김종민,서경원,김영옥,김준규,오재호,이윤동,김규봉,오정자,송연정,임종준,전범석,문전옥,최광식 식품의약품안전청 2000 식품의약품안전청 연보 Vol.4 No.-

MPTP 독성물질이 도파민성 신경세포에 선택적으로 작용하여 산화성 손상에 의한 신경세포사를 일으키는 것을 이용하여 파킨슨병의 동물모델을 만들고, 이를 통해서 아폼토시스를 비롯한 포사의 기전에 대한 연구 및 너코틴의 신경세포 보호효과 여부를 판정하는 실험을 병행하고자 하였다. 파킨슨꾐의 동물모델을 MPTf 독성 물질을 이용하여 확립하였으며, MPTP(30mgag, i.p.)를 투여한 후 1, 2,3, 4, 5일째 흑질 조직을 채춰하여 tarm로 박걸하여 tyrosine hydroxylase 면역조직화학염색을 수행하여 cell countif우한 결과, control은 57.635ce11s, 1일째 친.OfDells,2일째 57.9±6cells,3일릴 없.3±죠ells, 4일째 49.0츠3cells, 5일째 39.4±Scells료 4, 3일째 뚜렷한 신경세포 수의 감소를 보였다. 신경세포사 기전 규명을 위한 아폼토시스 분걱에서는 벼PTP 투여 후 1, 2, 3, 4, 5일째 조직을 채취하여 Hoechst staining, TUNEL staining을 수곡하였는데 양성 반응을 보인 신경세포는 관찰되지 않아. 아폼토시스로 인한 세포사가 관찰되지 않았다. bIPTP 파킨슨병 동물모델에서 nicotine 보호효과 탐색에 관한 실험은 nicat푸e 0.2mgAg을 5일 퐁안 투여 후 리『fP(30mgag)를 CS7Bt/6 마은스에 복강 내주사로 nicotine과 병용 투여한 후 1, 2, 3, 4, 5일째 뇌를 적출하땄다. 신경세포사가 뚜렷이 관찰되기 시작하는 4, 5일째의 신경세포 수의 감소 정도를 20. 30% 정도 약화시키는 경향을 보였으나, nicotine 보호효과에 대한 추가 실헝이 현재 수행 중에 있다. The cause of Parkinson's disease (PD) is largely unknown. However, free radical toxicit? may plaf a role ip. the degeneration of substantia nigra, which is the Hajorfocus of pathological damages in PD. Recently, a neuroprotective effect of nicotine in PD has been suggested. Therefore, the mechanism of neurodegenerafion and protective potential o( nicotine in PD were investigated in the experimental modeB of Pll using a neurotoxin, C57BL/6mice were administered with 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP, 30 mg/kg,j.p.). The degree of neurodegenerafion was determined by immunohistochemical stainiHB oftyrosine hydroxylase (TH). TH-positive cells on nigral sections were found 56.0 ±4, 57.9 ±6,52.315ce11s, 49.0±3cells, and 39,4±Scells at days 1, 2, 3, 4, 5, respectively (controls : 57.6±Scells). Hoechst and TUNEL staining showed no evidence of apoptosis. The exandnation on themice co-adrunistered with nicotine(0.2mgAg) and MPTP(30mgag) revealed a tendency ofnicotine protective effects. At days 4 and 5, the degree of TH-positive cells was decreased by20-30%, In corclusiffn, the role of apoptosis was not evidenced in this MPTP modeB of PB.The possible proteccon by nicotine should be elucidated with further studies.