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        • KCI등재후보SCOPUS

          Hemato-biochemical and Cortisol Profile of Holstein Growing-calves Supplemented with Vitamin C during Summer Season

          김종형,MAMUAD,LOVELIA,양철주,김선호,하종규,이왕식,조광근,이상석 아세아·태평양축산학회 2012 Animal Bioscience Vol.25 No.3

          Effect of vitamin C (VC) on biochemical, hematological and cortisol profile of growing Holstein calves during summer was investigated. Eighteen calves between 14 and 16 weeks of age were divided equally into two groups. One group received a diet supplemented with VC (20 g/d) for 60 days, while other non-supplemented diet fed group served as a control (CON). The temperature humidity index (THI) was recorded and computed during the experiment. From days 0 to 60, the THI exceeded 70. Blood samples were collected from the jugular vein of each calf at days 0, 15, 30, 45 and 60. Serum albumin and total protein decreased (p<0.05) in CON and VC calves with age. Serum glutamic-oxaloacetic transaminase concentrations were not affected by treatments. Serum creatinine, albumin and glutamic-pyruvic transaminase concentrations were higher in calves in the VC group than the CON group. While red blood cells, hemoglobin and hematocrit were lower (p<0.05) in VC calves, mean corpuscular volume, mean corpuscular hemoglobin, red blood cell distribution width and mean platelet volume were higher (p<0.05) in these VC supplemented calves. Leukocyte parameters including white blood cells and full term for lymphocytes were not affected by the treatments. Also, serum cortisol was not affected by treatments. At day 15, 30 and 45, the total VC in plasma was higher (p<0.05) in calves fed with VC. In conclusion, serum cortisols were not affected by plasma VC concentration, while some blood parameters were positively influenced in calves fed with VC.

        • KCI등재SCOPUS

          Effect of micro-scale Young's modulus and surface roughness on adhesion property to plasma-treated rubber surface

          김종형,Noritsugu,Umehara,Hiroyuki,Kousaka,Mamoru,Shimada,Mitsuru,Hasegawa 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.1

          Adhesion between rubbers and metals is often the main cause of machine trouble. Therefore, efficient utilization of rubber in dynamic and static applications requires the modification of the adhesion property of the rubber surface without affecting the bulk characteristics. In this work, we have studied the mechanism of the reduction in adhesion force between medical rubber, chloride-isobutene-isoprene rubber (CIIR), and stainless steel by using surface wave-excited plasma treatment of the rubber surface with oxygen and argon gases. Experimental results showed that surface roughness derivations increased by about 10 times across the treatment, at maximum, corresponding to the increase in time. In addition, the micro-scale Young's modulus of treated CIIR sheet increased by about 6.3 times at maximum from that of the untreated CIIR sheet. These changes in Young's modulus and roughness at the surface of CIIR sheet are considered to be the main reasons for the plasma-assisted reduction of adhesion force between stainless steel ball (SUS 440C, JIS) and CIIR sheet.

        • KCI등재

          Characterization of Viscoelastic Behavior of Poly(dimethylsiloxane) by Nanoindentation

          김종형,이진우,김우주,김종현,강승균,권동일 대한금속·재료학회 2019 대한금속·재료학회지 Vol.57 No.5

          In this study, we characterize the viscoelastic behavior of polymers using nanoindentation. We applied the indentation representative stress approach and elastic solution to the Maxwell model and determined that there was a linear relationship between the inverses of the initial unloading stiffness and indentation unloading rate. From nanoindentation tests with various unloading rates on poly(dimethylsiloxane), the linear relationship between the indentation unloading rate and the initial unloading stiffness was confirmed. We have suggested two parameters such as, elastic coefficient and viscous coefficient, represent the viscosity and elasticity of the polymer material based on their relation. In order to check the dependency of the elastic and viscous coefficients on mechanical properties, we performed nanoindentation on poly(dimethylsiloxane) with different crosslinking densities by mixing different proportions of curing agent. The viscosity and elasticity depend on the crosslinking density of polymer, and it was confirmed that the elastic coefficient and viscous coefficient obtained from nanoindentation varied with the same trend depending on crosslinking density.

        • SCIESCOPUSKCI등재
        • 한국에서의 옥내라돈 측정분석에 관한 연구(Ⅱ)

          김종형,오헌진,김혁주,김지순,김철현,이해룡,전재식 식품의약품안전청 1997 식품의약품안전청 연보 Vol.1 No.-

          라돈과 라돈자핵종에 의한 알파방사선의위해 평가 및 극소화방아늬 기초자료로 활용하고자 인천광역시, 대전광역시, 충청남도, 충청북도 지역의 38개 시·군·구에 대하여 590개가옥을 대상으로 charcoal canister를 사용하여 옥내라돈농도를 측저운석하였고, 이 결과를 가옥형태, 가옥의층수, 건축연한 및 지역별로 분석하여싸. 인천, 대전, 충청남북도 지역의 옥내평규라돈농도는 24.3±20.3Bq/㎥을 나타내었고, 이 지역의 라돈농도준위는 2.7~145.7Bq/㎥으로 조사되고 있어 이는 미국환경청(EPA)에서 권고하는 기준치 148Bq/㎥(4pci/l)보다 낮은 값을 나타내었다. The district-wide survey of indoor radon concentrations in houses at 38 areas of Incheon, Daejion, Chwungnain and Chwungbwug was conducted to analysis the risk of population exposure to the alpha-radiation from radon and radon progenies. The indoor radon concentrations for 590 houses were measured and calculated using NaI (T1) scintillation detector and charcoal canisters exposed for 48 hours. The result were sorted by the types, floors and constructing years of dwellings and districts of sites measured. The arithmetic mean of indoor radon concentrations in houses in the surveyed areas was 24.3±20.3 Bq/㎥ and the range of indoor radon concentrations was 2.7 Bq/㎥ to 145.7 Bf/㎥. All of the arithmetic mean of indoor radon concentration in the area of Incheon, Daejion, Chwungnam and Chwungbwug districts were-below 148 Bq/㎥(4 pCi/ℓ) which is the reference value of U.S. Environmental Protection Agency.

        • Machine Vision 기술동향과 미래

          김종형 제어로봇시스템학회 2013 제어로봇시스템학회지 Vol.19 No.4

          현재 머신비전 솔루션은 수많은 주변 시장으로 확산되고 있으며, 실제로 비전기술은 어느 공장 자동화 시스템과도 융합할 수 있는, 속도가 빠르고 유연성을 가진 솔루션이 되고 있다. 특히, 기술 혁신으로 인해 비전 센서와 스마트 카메라, PC 기반 머신비전 시스템과의 경계가 희미해졌고, 더불어 머신비전기술이 제조 공정 및 로봇 기술들과 계속 융합되면서 대폭 성장 가능성이 창출될 것이다. 본 특집호에서는 다양한 분야의 머신비전과 융합된 기술들을 소개하고자 한다.

        • KCI우수등재

          다차종통행배분을 이용한 통행량기반 수요추정기법개발

          김종형,이승재 대한교통학회 2001 大韓交通學會誌 Vol.19 No.1

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

          현재까지의 관측교통량기반 수요추정법은 단일차종(singleclass)기반 연구가 대부분을 차지하고 있다. 그러나 현실 교통망에서는 여러 차종이 혼재되어 교통수요나 흐름을 만든다. 즉, 기존의 관측교통량기반 수요추정법은 PCE(Passenger Car Equivalent) 환산을 통한 여러 개의 차종O/D 및 관측교통량을 승용차 단위로 전환하여 하나의 O/D 및 관측교통량으로 만들어 O/D를 추정하고, 최초의 PCE환산이전 차종별 O/D의 고정비율과 관측교통량 고정비율로 곱해 차종별 O/D 및 관측교통량으로 나누어 분석하는 것이 일반적인 방법이었다. 즉, 다차종기반분석법은 각각의 차종별 O/D에 대한 노선선택비율을 각각 계산하고, 그에 따른 목적함수 감소방향인 gradient를 또한 각각 계산하여 차종별 추정력을 극대화하는 것이 그 장점이라고 할 수 있다. 따라서, 본 연구에서는 단일차종기반추정법을 다차종기반추정법으로 확장하여 차종간 혼잡을 고려한 보다 현실적인 수요추정기법을 마련하는 것이 본 연구의 목적이라고 하겠다. Until now, though most of the studies related to demand estimation method using traffic counts use methods based on singleclass, travel demands or flows are made by mixing various vehicles in real networks. In general, existing demand estimation methods based on traffic counts estimate O/D by converting a multiclass O/D matrix and traffic counts into a singleclass O/D matrix and traffic counts through PCE conversion, and analyze a O/D matrix by dividing into a multiclass O/D matrix and traffic counts after multiplying an estimated O/D matrix by the fixed ratio of a singleclass O/D matrix and traffic counts before PCE conversion. However, the merits of a demand estimation method based on multiclass calculate each route choice ratio about multiclass O/D, and maximize the estimation capability of multiclass by calculating each gradient, the reduction direction of objective function. Therefore, this study aims to establish a demand estimation method which considers congestion between vehicle and vehicle by using multiclass instead of singleclass.

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