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        • KCI등재

          PVAm 적용이 백상지의 형광증백제 발현효율에 미치는 영향

          조병욱,원종명 한국펄프·종이공학회 2016 펄프.종이技術 Vol.45 No.4

          Effects of cationic polyvinylamine (PVAm) dry strength agent on effectiveness of optical brightening agent (OBA) during fine papermaking and the mechanism for brightness reduction of paper by PVAm was investigated by UV/Vis spectroscopy and turbidity measurement of OBA solution with PVAm. It was shown that PVAm reduced brightness of paper while opacity was not varied and tensile strength of paper was increased. Tetra- type OBA solution showed the peaks around the wavelength of 280 nm and 330 nm and the increase in the OBA concentration increased the UV absorbance in all wavelength. Addition of PVAm into the OBA solution decreased the UV absorbance at 280 nm. Turbidities of OBA and PVAm solutions were close to zero, respectively, while the turbidity value increased for the mixed solution of OBA and PVAm in various mixing ratios and the highest value was obtained when the mixing ratio of PVAm and OBA was 5:5, meaning that cationic PVAm formed complex with anionic OBA. In conclusion, cationic PVAm could form a complex with anionic OBA and that reduced UV absorbance, resulting in the reduced brightness of paper.

        • KCI등재

          Improvement of ink and heavy metal removal from old corrugated container stock by alkali kneading

          조병욱,송봉근,류정용 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.2

          One of the possible ways to strengthen competitiveness of Kraft paper industry is to replace the expensive virgin unbleached kraft pulp (UKP) with old corrugated container (OCC), a cheaper and lower grade raw material. When OCC is utilized to produce kraft paper, the main problems are the impaired appearance of the products, and heavy metals and hazardous materials in the products caused by the printed ink and other contaminants. In order to improve the removal efficiency of ink and heavy metals from old corrugated container stock, the effect of adding alkali during kneading of OCC stock was investigated. It was found that adding NaOH and sodium silicate during kneading could improve detachment of ink from fiber surface and removal of it from stock and hence improve heavy metal removal from OCC stock. Since alkali addition improves ink detachment, effective residual ink concentration (ERIC) of pulp was decreased and brightness was increased. Tensile strength and tensile energy absorption (TEA) were increased with addition of alkali.

        • KCI등재

          괴산지역 지하수의 우라늄 함량

          조병욱 대한자원환경지질학회 2017 자원환경지질 Vol. No.

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          괴산지역은 우라늄 함량이 높은 탄질점판암이 국부적으로 분포하고 있으며 화강암의 분포비율이 절반 정도나 되어지하수의 우라늄 함량이 높을 것으로 예상되었다. 250개 지하수에서 우라늄 함량을 분석하였고 250개 지하수 중 200 개 지점에서 암석내 우라늄 함량을 측정하였다. 연구지역의 지질을 5개 (옥천 변성사질암대 (Og1), 옥천 하부천매암대 (Og2), 옥천 함력천매암대 (Og3), 쥬라기화강암(Jgr), 백악기화강암(Kgr))으로 대분하면 암석의 우라늄 함량 중앙값은 Kgr에서 8.2 mg/kg으로 가장 높았으며 Og2의 우라늄 함량은 나머지 Jgr, Og1, Og3 (3.05~3.90 mg/kg)의 범위로 비슷하게 나타났다. 250개 지하수의 우라늄 함량 범위는 0.01~293.0 μg/L(중앙값 0.87 μg/L)으로 국내 전체 지하수의 우라늄 중앙값 0.74 μg/L와 비슷한 것으로 나타났다. 지질별 지하수의 우라늄 함량은 Kgr이 4.74 μg/L으로 높고 Og1, Og2, Og3는 0.35~0.74 μg/L으로 낮게 나타났다. 전체 지하수의 WHO의 음용수 가이드라인 30 μg/L 초과율은 국내 전체와 비슷한 2.8%이나 Kgr 지역의 초과율은 20.7%나 되어 추가 연구가 필요하다. Uranium concentration in groundwater of the Goesan area was anticipated high because the area contains Ogcheon metamorphic rock zone which partly includes coal bed bearing high uranium content and nearly half of the area is covered by granitic rocks. Groundwater samples collected from 250 wells in five 5 lithology (Ogcheon meta-sandy rock zone (Og1), Ogcheon lower phyllite zone (Og2), Ogcheon pebble bearing phyllite zone (Og3), Jurassic granite (Jgr), Cretaceous granite (Kgr)), of the area were analyzed and equivalent uranium concentrations (e(U)) from 200 rocks near sampled wells were measured using portable gamma spectrometry. Higher median value of e(U) (8.2 mg/kg) was found on Kgr outcrops. The median e(U) value of Og2 was not as high as that of Kgr and similar to those of Jgr, Og1, and Og3 (3.05~3.90 mg/kg). The uranium level in groundwater of the area ranged from 0.01 to 293.0 μg/L with a median value of 0.87 μg/L which is similar to the national median uranium level of 0.74 μg/L. The uranium concentration was high in the samples from the Kgr (median 4.74 μg/L) and low samples from the Og1, Og2, and Og3 (median 0.35~0.74 μg/L). The percentage of total samples having uranium level above 30 μg/L was 2.8%, on the other hand, that of Kgr is 20.7%, reflecting additional survey on the Kgr area is needed.

        • 중등학교 체육의 존립 당위성과 통합주제교과 중심의 방향 모색

          조병욱 한국스포츠리서치 2006 한국 스포츠 리서치 Vol.17 No.4

          테니스의 이해(역사와 특성, 운동의 기능적 요소, 예절 및 유의 사항 등) 테니스의 인물, 인생기, 스포츠의 가치 등 인터넷 활용

        • KCI등재후보

          Estimation of Genetic Parameters for Finished and Furlong Times in Thoroughbred Racehorses

          조병욱,Tae-Yong Ha,Kwang-Hyun Cho,Si-Dong Kim,Hak-Kyo Lee,공홍식,Kyung-Do Park 아세아·태평양축산학회 2009 Animal Bioscience Vol.22 No.12

          The objective of this study was to estimate genetic parameters for racing performance traits of thoroughbred racehorses, using a total of 58,124 racing records of 4,200 horses at Gwacheon Racing Park collected from January 2002 to December 2006. This study measured start one furlong time, last three and last one furlong times, and the resulting furlong time averages were 14.2 seconds, 39.9 seconds and 13.9 seconds, respectively. Furlong time means a split time measured based on a 1/8-mile (or approximately 201 m) distance and finished time means total racing time measured from start position to finish line. In the shortest distance races of 1,000 m, the average last three and last one furlong time was fastest at 38.7 seconds and 13.6 seconds, respectively. The correlation between finished time and start one furlong time decreased as the race distance increased, and the same trend was recognized from the correlation between finished time and last three furlong time. In short distance races of 1,400 m or less, the starting ability was found to be an important trait. The average speed was highest at 56 km/h for a 1,000 m race and lowest at 53.2 km/h for a 1,700 m race. Heritabilities of the start one furlong time, the last three and last one furlong time were estimated to be 0.337, 0.245 and 0.210, respectively; and repeatabilities for them were 0.452, 0.353 and 0.309, respectively. Phenotypic and genetic correlations between the start and the last one furlong time were negative at -0.141 and -0.155, respectively.

        • KCI등재

          괴산지역 지하수의 라돈 함량

          조병욱,Cho, Byong-Wook 한국지하수토양환경학회 2017 지하수토양환경 Vol.22 No.5

          Radon concentrations were measured in 250 groundwater samples collected from the Goesan area where uraniferous black slate and granites abundantly occur in the formations. The measured radon levels ranged from 0.90 to 7,218.7 Bq/L with the median value of 54.3 Bq/L, similar to the value measured in the nationwide survey in 4,853 wells (52.1 Bq/L). The median value was highest in the Cretaceous granite area (390.0 Bq/L) while it was as low as 20.0~58.8 Bq/L in the Ogcheon meta-sedimentary rock areas. About 23.6% of the total samples exceeded the WHO guideline value of 100 Bq/L established in 2011. The exceeding rate was 69.0, 39.4, and 7.0~13.7% in the Cretaceous granite area, Jurassic granite area, and Ogcheon meta-sedimentary rock areas, respectively.

        • KCI등재

          상주시 임곡리 굴착공의 적정양수량 결정

          조병욱,윤욱,문상호,이병대,조수영,김용철,황세호,신제현,하규철,Cho, Byong-Wook,Yun, Uk,Moon, Sang-Ho,Lee, Byeong-Dae,Cho, Soo-Young,Kim, YongCheol,Hwang, Seho,Shin, Jehyun,Ha, Kyoochul 대한지질공학회 2017 지질공학 Vol.27 No.3

          상주시 임곡리에 굴착된 심도 100 m 지하수공(PW-2)의 적정양수량을 산정하였다. 시추코아와, 물리검층 자료에 의하면 지하수 산출 심도는 26.1~26.5, 28.0~30.0, 33, 58, 71 m로 해석된다. 단계양수시험에 의하면 40, 55, 70, 90, $132m^3/d$의 양수량으로 70일간 양수시 수위강하량은 각각 6.48, 11.56, 18.07, 28.99, 60.26 m로 예상되었다. $117m^3/d$으로 250분간 실시한 일정량양수시험에서는 양수 경과시간 120~150분에 영향추가 불투수층 경계조건에 도달하여 급격한 수위강하가 일어나 PW-2의 한계채수량은 $90m^3/d$로 산정하였으며 이때의 수위강하량은 28.82~31.27 m이다. 적정양수량은 한계채수량의 범위내의 정류상태여야 하기 때문에 PW-2의 적정양수량은 $70{\sim}90m^3/d$로 제시하였다. 불투수층 경계조건에서 직선의 기울기가 급해지며 지하수의 DO와 ORP가 증가하는 것으로 보아 PW-2를 중심으로 한 기반암지하수의 발달은 제한적인 것으로 추정된다. We have determined the optimal pumping rate of the PW-2 water well (depth=100 m) at Imgokri, Sangju City. Cutting analysis and geophysical logging data reveal water-producing horizons at 26.1-26.5, 28.0-30.0, 33, 58, and 71 m. For pumping rates of 40, 55, 70, 90, and $132m^3/d$ over 70 days, the estimated drawdown from the PW-2 well was 6.48, 11.56, 18.07, 28.99 and 60.26 m, respectively. During a constant-rate pumping test at a rate of $117m^3/d$, the cone of depression intersected an impermeable boundary after 120-150 min of pumping. Therefore, we consider the critical pumping rate for well PW-2 to be $90m^3/d$. After pumping at $90m^3/d$ for 70 days, the calculated drawdown was 28.82-31.27 m. We suggest an optimal pumping rate for well PW-2 of $70-90m^3/d$, as the optimal pumping rate should be similar to the critical pumping rate. Sharp increases in the slope of the time-drawdown relationship, dissolved oxygen concentrations, and oxidation-reduction potential during the constant-rate pumping test indicate the limited development of bedrock aquifers around PW-2.

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