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고로슬래그시멘트를 사용한 다공성 황토콘크리트의 성능 평가
김황희,강수만,박종식,박상우,전지홍,이진형,차상선,박찬기,Kim, Hwang-Hee,Kang, Su-Man,Park, Jong-Sik,Park, Sang-Woo,Jeon, Ji-Hong,Lee, Jin-Hyung,Cha, Sang-Sun,Park, Chan-Gi 한국농공학회 2010 한국농공학회논문집 Vol.52 No.3
This study aims to evaluate a porous concrete using hwang-toh, blast furnace slag and blast furnace slag (BFS) cement instead of type I cement. The tests that were carried out to analysis the properties of porous hwang-toh BFS cement concrete included compressive strength, continuous void ratio, absorption rate, and pH value, repeated freezing and thawing test were conducted. Test results indicated that the performance in porous hwang-toh concrete are effective on the kaoline based binder materials. The pH value were shown in about 9.5 ~ 8.5. The compressive strength was increased and void ratio was decreased with increasing the kaoline based binder materials, respectively. The void ratio and compressive strength were in the range of about 21 ~ 30 %, 8 ~ 13 MPa, respectively. The increased in void ratio of more than 25 % is showed to reduce the resistance of repeated freezing and thawing. Also, the resistance of repeated freezing of thawing and the compressive strength of porous hwang-toh BFS cement concrete are independent with hwang-toh content and BFS cement amount. But, the void ratio was decreased with increasing the high volume hwang-toh contents (more than 15 %).
섬유보강 다공성 옥상녹화 황토콘크리트의 물리·역학적 및 온도변화 특성 평가
오리온,김춘수,김황희,전지홍,권완식,박찬기,Oh, Ri On,Kim, Chun Soo,Kim, Hwang Hee,Jeon, Ji Hong,Kwon, Wan Sig,Park, Chan Gi 한국농공학회 2013 한국농공학회논문집 Vol.55 No.4
The physical, mechanical, water purification and temperature properties of fiber reinforced porous hwang-toh green roof concrete have been evaluated in this study. The effect of the depending on replacement ratio of blast furnace slag to cement was investigated such that the replacement ratio is varied to 0 % and 30 %. Also, the replacement ratios of hwang-toh were 0, 20 and 30 %. The polyvinyl alcohol fiber was used for the reinforcing fiber. A series of pH test, unit weight, void ratio, compressive strength, after purification and variation of temperature test have been performed to evaluate the performance, water purification effect and temperature properties of the fiber reinforced porous hwang-toh green roof concrete. The test results indicate that the physical and mechanical properties of fiber reinforced porous hwang-toh green roof concrete is affected by the replacement ratio of the blast furnace slag and hwang-toh contents. Results of purifying water showed that the water purification effect of porous hwang-toh green roof concrete is about 40 %. Also, the temperature properties test results indicate the green roof blocks using fiber reinforced porous hwang-toh green roof concrete have insulation and temperature reduction effect.
비소성 무기결합재를 사용한 무시멘트 다공성 식생콘크리트의 물리·역학적 특성 및 동결융해저항성 평가
김황희,김춘수,전지홍,박찬기,Kim, Hwang Hee,Kim, Chun Soo,Jeon, Ji Hong,Park, Chan Gi 한국농공학회 2014 한국농공학회논문집 Vol.56 No.5
The physical, mechanical and freezing and thawing properties of non cement porous vegetation concrete using non-sintering inorganic binder have been evaluated in this study. Four types of porous vegetation concrete according to the binder type is evaluated. The pH value, void ratio, compressive strength, repeated freezing and thawing properties were tested. The test results indicate that the physical, mechanical and repeated freezing and thawing properties of porous vegetation concrete using the non-sintering inorganic binder is increased or equivalent compared to the porous vegetation concrete using the blast furnace slag + cement and hwang-toh + cement binders. Also, Vegetation monitoring test results indicate the porous vegetation concrete using the non-sintering inorganic binder have increasing effects of vegetation growth.
반응표면 분석법을 이용한 천연마섬유보강 순환굵은골재 콘크리트의 성능 평가
전지홍,김황희,김춘수,유성열,박찬기,Jeon, Ji Hong,Kim, Hwang Hee,Kim, Chun Soo,Yoo, Sung Yeol,Park, Chan Gi 한국농공학회 2014 한국농공학회논문집 Vol.56 No.4
In this study, evaluated ware the strength and durability of the vegetated water purification channel concrete to which recycled aggregates, hawang-toh and jute were applied. Box-Behnken method of response surface analysis in statistics was applied to the experimental design. Experimental variables are as follows, recycled coarse aggregates, hawang-toh, blast-furnace slag and jute fiber. In the experiment, conducted were the tests of compressive strength, chloride ion penetration, abrasion resistance and impact resistance the replacement rate effects of the recycled aggregates, blast-furnace slag and hwang-toh on the performance of vegetated water purification channel concrete were analyzed by using the response surface analysis method on the basis of the experimental results. In addition, an optimum mixing ratio of vegetated water purification channel concrete was determined by using the experimental results. The optimum mixing ratio was determined to be in 10.0% recycled coarse aggregates, 60.0% blast-furnace slag, 10.1% hwang-toh and 0.16% jute fiber. The compressive strength, chloride ion penetration, abrasion rate, and impact number of fracture test results of the optimum mixing ratio were 24.1 MPa, 999 coulombs, 10.30 g/mm3, and 20 number, respectively.
Jung Soo Lee,Dong Ki Ahn,Won Shick Shin,Kyung Jun Cho,Young Rok Ko,Il Chan Hwang 대한정형외과학회 2022 Clinics in Orthopedic Surgery Vol.14 No.4
Clinics in Orthopedic Surgery 2020;12:485-492 https://doi.org/10.4055/cios20028 In the article entitled “Vertebral body anterior translation, a novel technique for delayed myelopathy due to osteoporotic spine fractures,”1) the name of one of the authors was incorrectly presented: Il Chan Whang should read Il Chan Hwang.
황성욱,전보경,김찬훈,서정민,최금찬 동아대학교 환경문제연구소 2001 硏究報告 Vol.24 No.1
It is important to know the impacts of acid rain because of soil acidification, reduced biological productivity. Many researchers were interested in regional acid problems, and former research were focued in short-term trends of acid rain. It is not easy to evaluate acid rain problems because of many parameters relating to meteorological factors, which are wind, temperature, humidity and other factors. Rainfall sampling for this study was done from September 1933 to December 2000 in Dong-A University, Busan. All Samples were collected in separately to early fraction and succeeding fraction. Also, the samples were measured for pH, and EC, cations and anions were analysed by ion Chromatography.
황원중,권구중,이찬용,김남훈 강원대학교 삼림과학연구소 2001 Journal of Forest Science Vol.17 No.-
솔잎혹파리 피해 소나무재의 특성을 이해하고 효율적인 이용방법을 모색하기 위한 기초자료를 얻기위하여 솔잎흑파리 피해재의 해부 및 물리학적 성질을 조사하여 정상재와 비교 및 검토하였다. 그 결과, 솔잎혹파리 피해재는 정상재에 비해 축방향 수지구 및 수평수지구의 수가 많았고 위연륜이 출현하는 특징을 나타냈다. 또한 솔잎흑파리 피해재가 정상재보다 변 · 심재 모두 수축 · 팽윤율이 높았으며 변재부의 생재함수율은 정상재에 비해 다소 낮았다. 압축강도와 휨강도는 정상재보다 다소 낮았으나 전단강도는 거의 비슷한 값을 보여주었다. The objective of this work is to examine anatomical and physical characteristics of wood damaged by pine needle gall midge(PNGM, Thecodiplosis japonensis Uchida et Inouye) in Pinus densiflora. In anatomical characteristics, it was noted that the number of axial and radial resin canals in the damaged wood was higher than that in sound wood. In damaged wood, green moisture content of sapwood and swelling and shrinkage was higher than sound wood Both longitudinal compressive strength and bending strength of the damaged wood were lower than those of sound wood. On the other hand, shearing strength of damaged wood was similar to that of sound wood.Key word : Pinus densiflora, Thecodiplosis japonensis Uchida et Inouye, annual ring width, resin canal
황찬식 경북대학교 공과대학 1980 工大硏究誌 Vol.9 No.-
Two-Dimensional adaptive equalization is discussed for quadrature amplitude modulation (QAM) signal. Adaptive equalizer is composed of two tapped delay lines (TDL) for inphase and quadra ature signals, and each of TDL is controlled by two sets of tap weights. The tap weights are adaptively adjusted by the iterative procedure based on the gradient following algorithm for minimum mean-square-error. The system is implemented by digital circuitry. To understand the quantization effect on the convergence of the tap weights, the relation between the convergence and step-size in the iteration is investigated. It is shown that8-bit quantization and multiplication is applicable for 2400Hz binary QAM signal.
黃春仙,朴燦性 대구교육대학교 1983 論文集 Vol.19 No.-
When soybean sprout was cultivated by using the water containing mercury chloride (0 to 1.0 ppm), the results, related with the growth of soybean sprout and the state of absorption of mercury chloride are as follows; 1. Growth of soybean sprout in appearance was satisfactory, either it was cultivated by using the water or it was cultivated by using the solution of mercury chloride. 2. The accumulation of mercury in soybean sprout becomes efficient during early period of cultivation, and it reduces the contents of mercury according to the length of cultivation period. 3. The highest accumulation of mercury in soybean sprout was evident at the root of the plant.