펠렛형 제올라이트를 이용한 이산화황의 흡착특성

이재희,김정국,양희철,김준형,이제근 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.1

KA, NaA, CaA 및 NaX 제올라이트가 충전된 실험실 규모의 흡착층을 이용하여 SO_2 유입농도, 충전층 높이 및 공간속도를 변화시키면서 SO_2 흡착실험을 수행하였다. 평형흡착량과 파과시간 모두 제올라이트 세공크기에 따라 KA, NaA, CaA, NaX 순으로 증가하였다. NaX상에서 SO_2를 흡착시킬 경우 SO_2 유입농도 504ppm 이하에서 파과시간은 증가하나 역시 물질전달범위도 증가하여 물질전달 속도는 감소하였다. Wheeler 식으로부터 제올라이트상의 파과시간에 대한 평형흡착량, 공간속도 및 1/C_0의 관계를 확인한 결과, 504ppm 이상보다 504ppm 이하의 저농도에서 파과시간이 상대적으로 증가하였다. The experimental of SO_2 adsorption, with varying SO_2 concentration, packed-bed depth, and space velocity, was carried out using a lab-scale fixed bed with zeolites, such as KA, NaA, CaA and NaX. Both of an equilibrium adsorption capacity and a breakthrough time increased with zeolite pore size, in order of KA, NaA, CaA and NaX. Breakthrough time of NaX increased under SO_2 concentration of 504 ppm, but mass transfer rate decreased due to expansion of mass transfer zone. Breakthrough time is relatively increased in the low gas concentration(<504 ppm) more than high concentration(>504 ppm), which is proved by the effects of equilibrium adsorption capacity, space velocity and l/C_0 for the zeolite from the relationship of Wheeler equation.

현역 군인 발생을 중심으로 본 2000년도 국내 삼일열 말라리아 발생 현황

박재원,김영아,염준섭,유정식,양병국,채종일 대한감염학회 2001 감염 Vol.33 No.4

Background : Since 1997, the annual case occurrence of vivax malaria in the Republic of Korea have exceeded 1,000 cases since 1997. The military is thought to be an important source of the current outbreak. We collected various informations about malaria cases (soldiers, veterans and civilians) which occurred in 2000, and analyzed the characteristics of the current outbreak. Methods : Informations about malaria cases of soldiers, veterans and civilians, including name, age, sex, day of onset, region, etc., were collected through the National Institute of Health. Results : Out of total 4,141 cases, 1,288 (31.1%) occurred in the military, 1,273 (30.7%) occurred among the veterans, and 1,580 (38.2%) occurred among civilians. The monthly case occurrence reached its peak in early August. Areas such as Cheolwon, Yeoncheon and Paju showed the highest prevalence. Conclusion : It is considered that the current malaria outbreak has escaped from the exponential growth phase, however, more attention should be paid to prevent further spreading of malaria infection. (Korean J Infect Dis 33:280∼284, 2001)

아메바성 대장염과 연관된 Henoch-Scho¨nlein Purpura 1예

장재현,원경준,이준,변유미,이재광,김영훈,박찬국,김만우 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.3

Henoch-SchonIein purpura is a common form of vasculitis primarily involving the skin, the gastrointestinal tract, the joints, the kidneys, and the nervous system. The etiological investigations are essential, because triggering factors are found in approximately half the patients such as viral, bacterial and parasitic infections, drugs, toxins, systemic diseases and cancer. But it's the correlation between Henoch-SchonIein purpura and Entamoeba histolytica has been rarely reported. We report a 29-years-old woman with Henoch-SchoIein purpura complicated by the lower gastrointestinal bleeding caused by the amoebic colitis. She complained of cramping abdominal pain, lower extremity purpura and hematochezia. Cysts and trophozoites of Entamoeba histolytica were detected in her stool. Skin biopsy demonstrated the leukocytoclastic vasculitis. She was administered metronidazole 1,500㎎ a day for the treatment of amebic colitis. Her hematochezia was improved, but the abdominal pain and purpura were not. The subsequent corticosteroid therapy improved her symptoms.

디자인의 문화적 배경에 관한 고찰

이재국 청주대학교 학술연구소 2004 淸大學術論集 Vol.2 No.-

The wide range of understanding to the culture is very important in design practice, because all the design can't be avoided effect of different culture. Viewpoint of this, cultural background of design is studied in this paper. First of all, a few problems are suggested to the purpose and necessity of the paper. On the basis of this, the concept of design culture is searched through studying with cultural meaning of design, design as living culture and design for human begins. Also, on the same basis, background of cultural formation of design is researched through studying with change of life style, challenge to the new things and criteria on the beauty. Finally, another study is tried to find out how to understand design value and to create more valuable design which is variously existed under the different cultural background and social situation.

다이아몬드용 자동연마기의 성능평가

오재국,김우순,김동현 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

The present study deals design and manufacture of automatic polishing machine that can cut diamond to have 58 facets in a brilliant cutting which has been hardly achieved by a conventional manually operating polishing machine. Upon the 3-dimensional Sarin M/C test and analysis on the diamond processed by the automatic polishing machine developed in this study its proportion and finishing turned out to be better than the diamond processed by the conventional method, by being rated as "very good".

생쥐 소장의 interstitial cells of Cajal에서 ATP-민감성 K^(+)통로를 통한 향도잡이 전류의 조절

박찬국,김만우,김형석,최석,전제열 朝鮮大學校 附設 醫學硏究所 2005 The Medical Journal of Chosun University Vol.30 No.1

Objectives: This study was performed to investigate whether ATP-sensitive K^(+) channels exist in interstitial cells of Cajal (ICC) of mouse small intestine and the physiological role of ATP-sensitive K^(+) channels in gastrointestinal motility. Methods: ICC were isolated from mouse small intestine and cultured for 2 days. Electrical activities of ICC were recorded using the whole-cell patch-clamp technique at 30°C. Results: ICC displayed rhythmic slow waves and spontaneous inward currents (pacemaker currents). Pinacidil, an ATP-sensitive K^(+) channel opener, induced membrane hyperpolarization and decreased amplitude of slow waves in current clamping mode. Also, pinacidil inhibited amplitude and frequency of pacemaker currents and activated outward currents at a holding potential of -70 mV. Pinacidil effects on slow waves and pacemaker currents were blocked by glibenclamide, a specific blocker of ATP-sensitive K^(+) channel. Forskolin, an activator of adenylate cyclase, induced membrane hyperpolarization and inhibited pacemaker currents like as pinacidil and blocked by glibenclamide. Conclusions: These results suggest that ATP-sensitive K^(+) channels exist in ICC and may be play an important role in regulating gastrointestinal motility through the modulation of pacemaker activities of ICC.

구조방정식모델을 통한 활동과 통행의 인과관계모델

김재국,이진우,박병선 東新大學校 工業技術硏究所 2002 工業技術硏究 Vol.8 No.-

Although, we could get more reasonable results from the transportation behavior study based on activity diary data, there were not make rapid progressing because of the absence of analytical methodology. Therefore, we set up causal structure model of activity participation, trip generation, and travel time by the structural equation modeling to conquer of the absence of analytical methodology. Results of our studies show that activity-diary can be analyzed by the structural equation modeling. It will be a good study momentum in the behavioral study based on activity diary which had not been generalized because of the absence of analytical methodology.

選好意識데이타와 轉換價格데이타의 비교

金在國,李鎭友 東新大學校 工業技術硏究所 1996 工業技術硏究 Vol.2 No.-

In the mode choice analysis, since SP experiments present respondent with various hypothetical alternatives, which are produced by a combination of a number of different attribute levels, and ask them to indicate a preference, it is possible to analyze travel behavior under a situation of potential environment change such as proposed alternative mode of transportation. This study is to compare stated preference (SP) data with transfer price (TP) data by comparison of commulative transfer ratio from passenger car into medium rail transit. For this analysis, we assumed subway operations in the Gwang-Ju, and set up a choice-set of hypothetical options based on Experimental Design Method. As the result, the preference of same set of individuals by SP and TP questions might not be consistent with each other. This means that stated preferences are changable by difference of survey merhods. The updating of SP responses by the ultimatic condition of TP data also contributed the higher internal validity of SP model.

복수일의 활동일지에 근거한 교통행동분석

金在國,李鎭友 東新大學校 工業技術硏究所 1997 工業技術硏究 Vol.3 No.-

Most models and analysis of urban travel behavior focus on trying to explain variations in travel behavior of different behavior in terms of the characteristics of those individuals and their environment. Also, the analysis is typically based on a single day record of each individual' travel. But, developments in travel behavior analysis are leading to a greater awareness of the need to examine day-to-day variability in travel behavior. This paper analyzed dynamic characteristics, intrapersonal variability, and inter personal variability in urban travel behavior using activity diaries collected by 7 consecutives days in Gwangju. The analysis shows that, interpersonal variability as well as intrapersonal variability cannot be neglected in day-to-day variability of travel behavior.

과학소설의 사이버문학적 가능성 고찰

김재국 청주대학교 대학원 1997 우암논총 Vol.18 No.-