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      • 破壤靭性 試驗法과 그 應用에 關한 硏究(Ⅰ)

        金夏榮 大田開放大學 1986 論文集 Vol.5 No.-

        To avoid catastrophic failures in high-strength, low-ductility alloys, one must consider fracture roughness as well as yield strength. While K_IC is a basic materials property, n the same sense as yield strength, it changes with important variables such as temperature, strain rate and specimen thickness. For a given alloy, K_IC is strongly dependent on such metallurgical variables as heat treatment, texture, melting fractice, impurities inclusion, etc. In this study, it is considered the testing procdures by which the fracture mechanics approach can be used to measure meaningful materials properties. Since the methods of analysis are based on linear elastic fracture mechanics, these testing procedures are applied to restricted materials with limited ductility such as high-strength steel, titanium, aluminum alloy. K_IC testing has introduced with standardized procedure (ASTM standards, E 399), fracture toughness testing and its applications.

      • 디젤機關의 振動에 關한 硏究

        金夏永 忠州大學校 1983 한국교통대학교 논문집 Vol.16 No.2

        The main cause of vibration in a Diesel engine is due to the combustion vibration, the mechanical vibration by the rotating piston-crank. In this paper the phenomena causing the vibration are described theoretically, and the vibration of an engine are measured by condueting the practical experiments of the vibration of a Diesel engine. By investigating the measured Values of experimentation with the various condition, it was found that the vibration of an engine might be caused by the various vibration compounded with the burning pressure and the mechanical vibration. It was also found that the mechanical noise made a greater influence since the noise might increase as rotational speed increases.

      • 太陽熱 集熱器의 緯度에 따른 傾斜角에 關한 硏究

        金夏永 忠州大學校 1997 한국교통대학교 논문집 Vol.32 No.1

        The objective in this module is to present methods for the calculation of solar radiation incident on a tilted collector surface by using the solar radiation data on a horizontal surface. 1. For a tilt angle of solar collector. 2. Recognize the factors which affect the variablity of solar radiation at the earth's surface. 3. Estimate the mean daily solar radiation for each month of the year.

      • KCI등재

        Healthcare Costs of Osteoporotic Fracture in Korea: Information from the National Health Insurance Claims Database, 2008-2011

        김하영,하용찬,김태영,조혜민,이영균,백지연,장선미 대한골대사학회 2017 대한골대사학회지 Vol.24 No.2

        Background: The present study estimated healthcare costs of osteoporotic fractures including spine, hip, distal radius and humerus in Koreans over 50 years of age using national claims data. Methods: Korea National Health Insurance data between 2008 and 2011 was searched for all claims records of outpatient visits or hospital admissions of patients ≥50-years-of-age. Osteoporosis-related fractures were identified using certain the International Classification of Diseases, Tenth Revision codes and site-specific physician claims for procedures in a patient age cut-off value of 50 years. The healthcare costs included acute phase costs accounting for emergency medical care given immediately after fracture, costs due to further hospitalization and surgical procedures, physiotherapy sessions according to the site of the fracture, and outpatient visits in the year after discharge. Results: The total estimated healthcare costs of osteoporotic fractures in 2011 was $722 million. From 2008 to 2011, the total number and healthcare costs of osteoporotic fractures increased 28.9% (from 127,070 to 163,823) and 31.6% (from $549 million to $722 million), respectively. The portion of national health care expenditure was ranged from 2.3% in 2008 to 2.2% in 2011. The mean healthcare cost of osteoporotic fractures per person increased 2.1% from $4,321 in 2008 to $4,410 in 2011.The mean healthcare costs were highest for hip fractures followed by spine, humerus, and distal radius fractures. Conclusions: Total Healthcare costs of osteoporotic fractures in South Koreans ≥50-years-of-age increased between 2008 and 2011. This trend will likely continue, which is an important health problem in the elderly population and economically.

      • KCI등재후보

        Speech act analysis of the English section of College Scholastic Ability Test: With focus on conversational listening material

        김하영,이현우 한국중등영어교육학회 2015 중등영어교육 Vol.8 No.4

        For the past three years, the College Scholastic Ability Test (CSAT) has undergone two major revisions. The first major change was made to the 2014 CSAT, and the second one, to the 2015 CSAT. Accordingly, the listening part of the CSAT has been repeatedly changed in the number and types of question items. Given these revisions, one would naturally think that they have had some effect on the conversational listening material used in the 2014 and 2015 CSATs. In an effort to examine whether this reasoning is objectively supported, the present study aims to answer the questions whether there is a difference between the 2013, 2014 and 2015 CSATs (i) in the case of the distribution of illocutionary acts identified by Searle (1976) and (ii) in the case of the use of direct and indirect speech acts. Comparison of the data annotated with speech acts through the chi-square tests shows that there is no difference between the three CSATs in either of the cases. It is, however, suggested that the provision of virtually the same amount of listening material using indirect speech acts is crucial in maintaining the same level of difficulty of listening tests of CSAT.

      • KCI등재

        개인용 전기 이동수단 ‘EPM(Electronic Personal Mobility)’의 시장분석과 향후 방향 제시

        김하영,황성걸 한국일러스아트학회 2015 조형미디어학 Vol.18 No.2

        Although the EV(Electronic Vehicle), PHV(Plug-in Hybrid Vehicle) are considered as one of the solution for relieving exhaust gases and traffics, commercialization of the solutions has been delayed due to the lack of relevant regulations, policies and infrastructures. Unlike foreign markets, where the use of bicycle is active, Korea is facing difficulties with PM(Personal Mobility) due to its perceptions and mountainous geographical issues . PM is a personal transportation that covers all of the electrically driven personal mobile devices which can run short or intermediate distance. It has been introduced both in domestic and foreign markets as a solution for the problem mentioned above. Conducting R&D on the domestic EPM(Electronic Personal Mobility) market is essential for PM to be commercialized and to be perceived as a means of transportation in everyday life ranging across all ages. While domestic market for bicycles has been steadily grown since 2008, it reached the limitation since bicycles are mainly utilized as a means of transportation for parks where there are cycle lanes and short-distance commutes to school or work. It is expected to cater to all ages’ tastes if we can commercialize PM by developing a reasonable EPM considering the geographical conditions of Korea along with relieving the parking difficulties and traffic congestion. Also, invigorating the domestic EPM market will accelerate the market revival for both domestic major automakers and midsize companies that deals with related components in all aspects including technologies, infrastructures. 현재 배기가스 문제 등의 해결 방안으로 EV(Electronic Vehicle), PHV(Plug-in Hybrid Vehicle) 등이 대두되었지만, 관련 법규와 정책 등 관련 인프라의 부족으로 인해 대중에게 상용화가 지연되고 있다. 자전거 이용이 활성화 된 해외 시장과 달리, 한국은 지형 특성상 언덕이 많기 때문에 순수 인력만으로 모빌리티를 다루기에는 어려움이 따른다. PM(Personal Mobility)은 근거리 및 중거리를 주행할 수 있는 전기구동 방식의 개인용 이동수단을 통칭하는 소형 이동기로 위의 상기한 문제점을 해소시킬 수 있는 대안으로 국내외에서 제시되고 있다. 전 연령층을 아우르는 생활 속 교통수단으로 인식되고 상용화되기 위해서는 국내 EPM(Electronic Personal Mobility) 시장의 연구와 개발은 필수적이다. 이러한 세계적인 추세에 따라 국내 자전거 시장은 2008년 이래로 꾸준히 성장하고 있지만, 자전거 도로가 형성되어 있는 공원이나 단거리 통학, 통근길 이동 수단으로 주를 이루고 있다는 것이 한계이다. 뿐만 아니라, 국내 퍼스널 모빌리티 수요의 대부분은 수입품이 주류를 이루고 있다. 주차난 및 교통난을 해소하고 국내 지형적 특성에 부합하며 한국인의 사고방식에 맞는 합리적인 EPM의 개발을 통해 상용화 한다면 전 연령층의 사용 기호를 충족시킬 수 있을 것으로 기대된다. 또한, 국내 EPM 시장의 활성화는 관련 기술, 인프라 등의 여러 가지 면에 있어 국내 대형 자동차업체뿐만 아니라 관련 부품을 취급하는 중소기업 시장 부흥의 촉매 역할을 할 것이다.

      • KCI우수등재

        건설 재해사례 보고서의 텍스트 마이닝을 통한 복합사고 패턴 분석

        김하영,이준성,장예은 대한건축학회 2022 대한건축학회논문집 Vol.38 No.4

        Construction accidents usually involve two or more injuries in succession considering various risk factors are present everywhere on site. This study aims to analyze the patterns of these multi-cause accidents through a text mining methodology. There were 1,300 accident reports from the Korea Occupational Safety & Health Agency (KOSHA). The collected data was refined and processed through a morpheme analyzer for semantic analysis. A Python algorithm was developed and applied to extract multi-cause accidents; 139 out of 987 accident cases were extracted. The occurrence patterns involving the 139 multi-cause accidents were based on the relationship of each accident type and the occurrence characteristics by type. The type of multi-cause accidents that occurred at the highest frequency were the narrowness or winded (Type 2) or fall (Type 1) due to the fall down or overturn (Type 5) of an object or structure. The rate of acting as a primary and secondary accident differed depending on the accident type. Falling (Type 1) and narrowness or winded (Type 2) had a very high proportion of secondary accidents, while the flying object, collision, fall down or overturn and collapse (Type 3, 4, 5 and 6, respectively) were more likely to act as primary accidents. Using the results from this study, once a specific accident is recognized, the scale of the accident can be minimized by closely examining the occurrence of similar accidents and possibly prevent future occurrences. Additionally, this study can provide direction to review data classified as a single accident from past instances. 다양한 위험 요소가 혼재된 건설 현장에서는 2가지 이상의 사고가 연쇄적으로 발생하는 경우가 많다. 본 연구는 건설 현장의 복합사고가 어떠한 패턴으로 발생하는지 분석하기 위해 한국산업안전보건공단(KOSHA)의 건설 재해사례 보고서 1,300건을 수집하였다. 이후 Python 기반의 자연어 처리 및 복합사고 추출 알고리즘을 적용하여 987건의 재해 사례 중 139건의 복합사고를 추출하였다. 이후 복합사고 행렬을 활용하여 두 가지 관점에서 복합사고의 발생 패턴을 분석하였다: 1) 선후행 관계에 따른 사고유형별 연관성 및 2) 사고유형에 따른 발생 특성. 우선, 가장 높은 빈도로 발생한 복합사고의 형태는 물체나 구조물의 넘어짐/전도(유형5)로 인한 끼임/감김(유형2) 또는 떨어짐(유형1) 재해이다. 이는 건설 현장의 구조물이 무너지거나 전도되면, 근로자가 중심을 잃고 추락하거나 끼이는 형태의 복합사고가 발생할 가능성이 높다는 점을 시사한다. 또한, 사고유형에 따라 1차 및 2차 사고로 작용하는 비율이 상이하였다. 떨어짐(유형1)과 끼임/감김(유형2)은 2차 사고로 작용하는 비중이 매우 높았던 반면, 낙하, 부딪힘, 넘어짐/전도, 무너짐(유형3, 4, 5, 6)은 1차 사고로 작용하는 확률이 더 높은 것으로 나타났다. 본 연구의 결과를 활용하여, 만일 사고 발생으로 특정 재해를 인지한 경우 그와 연관성 높은 재해의 발생 여부와 추후 발생 가능성을 면밀히 살펴봄으로써 재해 규모를 최소화할 수 있으며, 과거에 단일사고로 분류되었던 자료의 재검토가 필요한 경우 방향성을 제시할 수 있다.

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