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고재군,김문기,이신호,Koh, Chae-Koon,Kim, Moon-Ki,Rhee, Shin-Ho 한국농공학회 1985 한국농공학회논문집 Vol.27 No.2
Wasting fiberous residues from the cutting processes of steel materials at an iron-Works were mixed with concrete. The strength and toughness of steel fiber concrete with different steel contents were tested in a laboratory. The test results showed that the steel fiber residues can be used for the reinforcement of concrete. The potential applications of such product include floor constructions for facilities like dairy barns, grain storages, and machinery shops. The test results are as follows. 1. The compressive strengths of steel fiber concrete with one percent steel content by volume were 20 percent greater than that of plain concrete. The treatments also increased the concrete toughness by 96 percent. 2. When applied to tensile forces, the steel fiber concrete showed the increased strengths by 20 percent, and the toughness by 48 percent. 3. The steel content levels greater than or equal to 1.5 percent by volume resulted in the decreases of the compressive and tensile strengths of steel fiber concrete by 10 percent as compared to plain concrete. The concrete toughness increased with the steel contents. 4. The reinforcement effects of steel fiber depend on the quality of fiber material being used. Good steel fiber for concrete reinforcement appears to be uniform in shape and component, fine and long, and round-shaped.
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고재기 慶山大學校 基礎科學硏究所 1997 基礎科學 Vol.1 No.1
우리나라 남동부에서 처음으로 발견된 울산시 정족산 무제치에 있는 4개의 늪에 대하여 산지습원으로서의 특성을 파악하기 위하여 몇가지 환경요인과 식생을 1996년 5월과 10월에 조사하였다. 출현빈도가 높은 종으로는 진퍼리새(Molinial japonica), 끈끈이주걱(Drosera rotundifolia), 숫잔대(Lobelia sessilifolia), 물매화(Parnassia palustris), 가는 오이풀(Sanguisorba tenuifolium var. alba), 쉽사리(Lycopus ramosissimus var. japonicus), 물이끼(Sphagnum palustre), 흰개수염(Eriocaulon sikokianum) 등이며, 이들이 무제치늪의 식생을 특징짓는 종이다. 4개늪 표면수의 수온, 용존산소, 전기전도도, 수소이논농도는 5월에는 13.8-30.8℃, 3.64-8.26mg/l, 16-26μS/Cm, 5.74-6.87, 10월에는 12.4-17.5℃, 3.62-10.22mg/l, 20-139μS/Cm, 5.53-7.12 범위를 나타내었다. 또한 4개 늪 토양의 수분함량과 유기물함량 및 신선토의 수소이온농도는 58.2-466.6%, 12.6-66.2%, 5.25-6.78의 범위를 각각 나타내었다. 10월에 제2늪 표면수의 전기전도도와 토양의 유기물함량이 두드러지게 높게 나타난 것이 특기할 사항이다. Several environmental factors of water and soil in four Moojechi moors on Mt. Jongjok, east-southern Korea were investigated from May to October, 1996. The high frequency of species on Moojechi moors were Molinia japonica, Drosera rotundifolia, Lobelia sessilifolia, Parnassia palustris, Sanguisorba tenuifolium var. alba, Lycopus ramosissimus var. japonicus, Sphagnum palustre, Eriocaulon sikokianum. Mujaechi moors will be characterized by these species. The values for surface water temperature, dissolved oxygen, electric conductivity, pH on four moors showed 13.8-30.8℃, 3.64-8.26 mg/l, 16-26μS/Cm, 5.74-6.87 respectively in May, and the values for same factors in October showed 12.4-17.5℃, 3.62-10.22 mg/l, 20-139 μS/Cm, 5.53-7.12 respectively. and the values for water content and organic matter content of soil and pH of soil or peat(fresh) in four moors showed 58.2-466.6%, 12.6-66.2%, 5.25-6.78 respectively. The value for electric conductivity of surface water and organic matter content of soil of No.2 moor(site 1) was very high.
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고재한,임수한,이영한,양익환,감진화,박관규 대한고관절학회 2018 Hip and Pelvis Vol.30 No.4
Purpose: This study aimed to evaluate the efficacy of simultaneous computed tomography (CT) and quantitative CT (QCT) in patients with osteoporotic hip fracture (OHF) by analyzing the osteoporosis detection rate and physician prescription rate in comparison with those of conventional dual-energy X-ray absorptiometry (DXA). Materials and Methods: This study included consecutive patients older than 65 years who underwent internal fixation or hip arthroplasty for OHF between February and May 2015. The patients were assigned to either the QCT (47 patients) or DXA group (51 patients). The patients in the QCT group underwent QCT with hip CT, whereas those in the DXA group underwent DXA after surgery, before discharge, or in the outpatient clinic. In both groups, the patients received osteoporosis medication according to their QCT or DXA results. The osteoporosis evaluation rate and prescription rate were determined at discharge, postoperative (PO) day 2, PO day 6, and PO week 12 during an outpatient clinic visit. Results: The osteoporosis evaluation rate at PO week 12 was 70.6% (36 of 51 patients) in the DXA group and 100% in the QCT group (P<0.01). The prescription rates of osteoporosis medication at discharge were 70.2% and 29.4% (P<0.001) and the cumulative prescription rates at PO week 12 were 87.2% and 60.8% (P=0.003) in the QCT and DXA groups, respectively. Conclusion: Simultaneous CT and QCT significantly increased the evaluation and prescription rates in patients with OHF and may enable appropriate and consistent prescription of osteoporosis medication, which may eventually lead to patients’ medication compliance.
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미래 수요예측을 통한 제주도 농업용수 회복탄력적 공급 방안에 관한 연구
고재한,정민혁,범진아,성무홍,정형모,유승환,윤광식 한국농공학회 2020 한국농공학회논문집 Vol.62 No.3
Resilience is the capacity to maintain essential services under a range of circumstances from normal to extreme. It is achieved through the ability ofassets, networks, systems and management to anticipate, absorb and recover from disturbance. It requires adaptive capacity in respect of current andfuture risks and uncertainties as well as experience to date. The agricultural infrastructures with high resilience can not only reduce the size of thedisaster relatively, but also minimize the loss by reducing the time required for recovery. This study aims to evaluate the most suitable droughtcountermeasures with the analysis of various resilience indices by predicting future agricultural water shortage under land use and climate changescenarios for agricultural areas in Jeju Island. The results showed that the permanent countermeasure is suitable than the temporary countermeasuresas drought size and the cost required for recovery increase. Wide-area water supply system, which is a kind of water grid system, is identified as themost advantageous among countermeasures. It is recommended to evaluate the capability of agricultural infrastructure against drought with the variousResilience Indices for reliable assessment of long-term effect.
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고재기,조영호 대구한의대학교 기초과학연구소 2003 基礎科學 Vol.7 No.2
본 조사에서 기록된 관속식물은 69 科 174 屬 227 種 40 變種 2 品種으로 총 269 種이 조사되었다. 생활형의 구성은 남한지역 전체와 비교할 때, 지상식물, 지중식물 및 지표식물의 비율이 낮았고, 반지중식물, 1년생식물 및 수생식물의 비율이 현저히 높게 나타났다. 본 조사 지역에서 얻어진 귀화식물은 전체 출현종의 8.55%로써 23종 이 출현하였다. 낙동강 본류의 수생식물은 총 16과 20속 31종 4변종을 총 35종류가 조사되었으며 정수성이 14종(40.0%)으로 가장 많았으며 침수성 11종(31.4%), 부엽성 7종(20.0%), 부유성 3종(8.6%)의 순으로 나타났다. 수생식물의 분포는 대구상류에 16 종, 대구 하류에 26종으로 하류로 갈수록 많이 출현하고 있으며, 침수식물인 검정말 (Hydrilla verticillata)이 우점종으로 관찰되었다. This study was undertaken to describe the riverside flora in 73 plots around the mainstream of Nak-tong River, Korea from March, 1995 to October, 1996. The field survey were carried out through the process of direct collection on actual vegetation and drying, fixation and identification of each specimen. The vascular plants around the mainstream of Nak-tong River were consisted of 269taxa; 69 families, 174 genera, 227 species, 40 varieties, 2 forms. Compared with Raunkiaer's lifeform spectrum, the percent of phanerophyte, geophyte and epiphyte were lower and hemicryptophyte, hydrophyte and therophyte were higher remarkably in spectrum of this riverside flora than spectrum of South Korea. The Korean endemic plants are 5 taxa and naturalized plants are 23 taxa. The percent of species number of naturalized plants around the mainstream of Nak-tong River per total species number of naturalized plants in South Korea is 12.8%. The hydrophytes around the mainstream of Nak-tong River were consisted of 35taxa; 16 families, 20 genera, 31 species, 4 varieties and the composition of hydrophytes by life cycle were 10 emergent hydrophytes, 5 floating-leaved hydrophytes, 13 submerged hydrophytes, 3 free-floating hydrophytes and dominant species in hydrophytes was Hydrilla verticillata And the subsidiary knowledge from this study will provide practical information on the study for biodiversity and habitat conservation.
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