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문종대(Jong-Dae Moon),안차수(Cha-Soo Ahn),진현승(Hyun-Seong Jin),안순태(Soon-Tae Ahn) 한국언론정보학회 2007 한국언론정보학보 Vol.38 No.2
본 연구는 기존 공정성 연구에서 소홀하게 취급됐던 언론의 일반 수용자 시각에서 공정성에 접근하고자 하는 탐색적 시도이다. 본 연구는 공정성 개념의 경험적 탐구라는 측면에서 일반 언론 수용자를 대상으로 (불)공정성 개념의 의미를 구체적으로 탐색하여 기존의 개념 혹은 전문인에 의해 구축되었던 개념과의 비교를 시도했다. 또한 일반 수용자 개념 구성의 특성과 시사점이 검토되었다. 본 연구를 위해서 서울지역 300명의 성인을 대상으로 591개 언론의 불곰정한 사례를 모아 분석한 결과 수용자들이 느끼는 기장 심각한 불공정은 언론이 중립적이지 못하다는 것과 더불어 진실성과 균형성에 문제가 있음을 지적하였다. 연구결과 기존의 개념적 구성과는 달리 일반 수용자들은 언론의 윤리성과 상업성이 불공정성의 요소가 될 수 있다는 점을 제기한 반면, 기존 연구에서 이론적으로 중요한 개념적 구성요소였던 독립성과 적절성은 수용자들에게 별로 중요한 의미를 각지 않는 것으로 나타났다. 또한 연구 결과를 로대로 언론의 일반 수용자에게 언론의 공정성은 어떤 의미를 가지며 그들이 공정성을 평가하는 데 있어 어떠한 범주들이 영향을 미치고 있는지가 검토되었다. The study tried to explore ordinary people's press fairness concept being neglected by the mainstream of fairness research thus far. With empirical standpoint, this study first investigated (un)fairness concept held by general audience, and then compared it with existing ones long suggested by experts such as scholars and media workers. Also, the study examined audience's concept construct in terms of its characteristics and implications. A systematic sample of 300 adults in Seoul was interviewed and their answers (instances of press unfairness) were analyzed and categorized. The most serious problem in fairness, they pointed, was that the press's not neutral. Also, truth and balance were importantly raised as a press problem with regard to fairness. The result showed press ethics and commercial morals could be a significant element for people's view on press fairness. These elements are new to the literature and heuristic regarding how to approach toward fairness issue in our society. The study also discusses the implications of other findings.
이진범 ( Jin Beom Lee ),강남현 ( Nam Hyun Kang ),박지태 ( Ji Tae Park ),안순태 ( Soon Tae Ahn ),박영도 ( Yeong Do Park ),최일동 ( Il Dong Choi ),남대근 ( Dae Geun Nam ),조경목 ( Kyung Mox Cho ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.11
Various types of steel, namely, 0.35C, 0.2C-Cr, and 0.2C-Cr-Mo steels, were quenched and tempered by high-frequency induction heat treatment. The type, size, and spheroidization of the carbides varied depending on the tempering temperatures (450~720℃). During the tempering process, the carbide was precipitated in the martensite matrix. The 0.35C, 0.2C-Cr, and 0.2C-Cr-Mo steels contained carbides that were smaller than 120 nm. The carbide was spheroidized as the tempering temperature increased. Owing to the fine microstructure and spheroidization of the carbides, all three steels had a high tensile strength as well as yield ratio and reduction of area. In the case of the 0.2C-Cr steel, the use of Cr as an alloying element facilitated the precipitation of alloyed carbides with an extremely small particle and resulted in an increase in the spheroidization rate of the carbides. As a result, a large reduction of area was achieved (>70%). The 0.2C-Cr-Mo steel had the highest tensile strength because of the high hardenability that can be attributed to the presence of alloying elements (Cr and Mo). Quenching and tempering steels by induction heat treatment resulted in a high strength of over 1 GPa and a large reduction of area (>70%) because of the rapid heating and cooling rates.
순 타이타늄의 튜브인발공정시 최적 금형설계에 대한 고찰
최광호(Kwang-Ho Choi),박찬희(Chan-Hee Park),김병민(Byung-Min Kim),이경훈(Kyung-Hun Lee),안순태(Soon-Tae Ahn),박지태(Ji-Tae Park),염종택(Jong-Taek Yeom) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
In this study, the optimum die for the tube drawing process of pure titanium (Gr. 2) was designed with calculation method and experimental analysis. The accuracy of dimension and the protection of tube drawing defects were considered in the optimum die-design. In order to calculate the load during tube drawing, the calculation method proposed by Gelegi was utilized. Also, tube drawing process of pure titanium using designed die was carried out by considering the process parameters such as initial annealing temperature, lubricant and drawing pass. Finally, the die-design for tube drawing of pure titanium was validated by comparing the properties and the accuracy of dimension before and after drawing process.
가스텅스텐 아크용접용 타이타늄합금 플럭스-메탈 코어드 와이어 제조기술
최성우(Seong-Woo Choi),홍재근(JaeKeun Hong),박찬희(Chan Hee Park),이상원(Sangwon Lee),강남현(Namhyun Kang),최윤석(Yoon Suk Choi),박지태(Ji Tae Park),안순태(Soon Tae Ahn),염종택(Jong-Taek Yeom) 대한용접·접합학회 2019 대한용접·접합학회지 Vol.37 No.3
At present, flux or metal cored wires are widely used in iron-based materials for flux cored arc welding in order to reduce the cost of welding production. However, the development of flux or metal cored wire for titanium materials, which are widely used in the petrochemical, power plant and marine vessel fields, has not been done yet, and development is required. In this study, manufacturing process of titanium alloys flux-metal cored wire for gas tungsten arc welding was investigated by FEM simulation and experimental analysis. FEM simulation of tube welding process was carried out with initial three preform-types (butt tube, overlap tube and welded tube). In the FEM simulation results, tube welding process using initial welded tube was evaluated to cause cracking of the specimen during the process. In actual making process of titanium alloys flux-metal cored wire for gas tungsten arc welding, overlap-type tube was evaluated to be the most suitable initial preform shape. In addition, it was confirmed that the filling ratio of the flux-metal was maintained uniformly at over 70%.
유도가열 템퍼링한 저탄소강의 미세조직 및 기계적 성질에 미치는 합금원소의 영향
安順泰,曺敬穆,李相來 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.3
Microstructure and mechanical properties of 0.2%C steels tempered employing induction heating method were investigated in this study. Effect of alloying elements on tempered microstructure with a variation of tempering temperature was examined. Tensile properties and impact strength of tempered steels were estimated to compare steels with and without alloying elements. The evolution of microstructure of tempered steels revealed the precipitation of acicular carbides with particular orientations and the precipitation and growth of spherical cementite particles with increasing tempering temperature. The process of the microstructural evolution was found to be delayed by addition of alloying elements Cr and Mo. Yield and tensile strength decreased with increasing tempering temperature. Reduction of area and total elongation increased with increasing tempering temperature. Impact strength increased with increasing tempering temperature. All these mechanical properties were closely related to the microstructural evolution of the steels. It was concluded that proper mechanical properties could be obtained for carbon steels without addition of alloying element by controlling tempering temperature using induction heating method.
유도가열 소입소려 열처리 저탄소 Cr-Mo 강의 미세조직 및 인장 특성
安順泰,李相來 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.1
Microstructural evolution of a low alloy steel tempered at various temperature in the range of 300-700℃ using induction heating method was examined. A series of microstructural evolution such as precipitation of acicular cementite with particular orientation and formation of spheroidized cementite was observed with increasing tempering temperature. Comparing to the tempered steel with salt-bath, similar tempered microstructure could be obtained at higher temperature by induction heating. Tensile stress-strain curves of the tempered steel revealed that the excellent formability of the low alloy steel would be achieved by tempering in the range of 500-700℃ with induction heating method which is commercially applicable heat-treatment process.
안순태,이상래 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.2
Tempering of 0.2% C alloyed steel was tried to carry out employing induction heating method in this study. Mechanical properties of the steel tempered by induction heating and salt bath heating were compared to check the possibility of induction heating for industrial application. Results show that yield and tensile strength decreased and reduction of area and total elongation increased with increasing tempering temperature. It was found that one needs just increased tempering temperature with the induction heating method to obtain desired properties of tempered steel for proper formability, This evident fact was revealed from the unique relationship of reduction of area and total elongation as a function of tensile strength. The increased impact strength could be obtained with induction heating tempering. Prior austenite grain size affected to yield strength and impact strength but not tensile strength, reduction of area and elongation. It was concluded that induction heating method would be one of the competitive heat treating processes for steels in industrial fields.