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Chulwoong Bae,Yong-Koo Kahng,Hae Sung Sohng 미래영어영문학회 2012 미래영어영문학회 학술대회 자료집 Vol.2012 No.12
This study explores the effects of phonological awareness instruction with phonetics on listening comprehension and speaking. For the test of measuring the improvement of listening comprehension, two nationwide listening comprehension tests were used for pre-test and post-test. To find out the improvement of speaking ability, students were required to take the Level-3 NEAT speaking tests. There was a notable correlation between phonological awareness instruction with phonetics and listening ability. Also a significant correlation between phonological awareness instruction with phonetics and speaking ability was found. The group with phonological awareness class with phonetics received higher scores in listening and speaking test than the group without phonological awareness class with phonetics in the post-test. This study implies that phonological awareness class with phonetics is helpful for the improvement of listening and speaking ability. With this research, we can also say that students’ communicative competence increased.
Nano-Attached Tungsten Particle Synthesis and Sintering Behaviors
Chulwoong Han,Hanshin Choi,Byoungmoon Kim 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.5
The reduction of sintering temperatures in industrial processes is advantageous for both energy efficiency and material properties in powder metallurgy. Based on the well-known size effects of nano-particles on sintering processes, nano-particles were intentionally used as a homogeneous sintering activator for micro-particles in this study. Two kinds of tungsten bimodal feedstocks which consisted of nano-particles and microparticles were prepared and sintered by spark plasma sintering processed. Even at the low sintering temperature of 1,250 °C and the short sintering time of 300 sec, relatively high densities could be achieved. Depending on the content of the nano-particles in the charged feedstock, the sintered body exhibited different morphological features. Density, field emission scanning electron microscopy, transmission electron microscope was used for analysis.
Chulwoong Bae,Yong-Koo Kahng,Hae Sung Sohng 한국영어어문교육학회 2012 영어어문교육 Vol.18 No.1
This study explores the effects of phonological awareness instruction with phonetics on listening comprehension and speaking. For the test of measuring the improvement of listening comprehension, two nationwide listening comprehension tests were used for pre-test and post-test. To find out the improvement of speaking ability, students were required to take the Level-3 NEAT speaking tests. There was a notable correlation between phonological awareness instruction with phonetics and listening ability. Also a significant correlation between phonological awareness instruction with phonetics and speaking ability was found. The group with phonological awareness class with phonetics received higher scores in listening and speaking test than the group without phonological awareness class with phonetics in the post-test. This study implies that phonological awareness class with phonetics is helpful for the improvement of listening and speaking ability. With this research, we can also say that students’ communicative competence increased.
In-situ molybdenum nano-attached particle synthesis from spent Mo scrap.
Han, Chulwoong,Kim, Byungmoon,Choi, Hanshin American Scientific Publishers 2014 Journal of nanoscience and nanotechnology Vol.14 No.10
<P>Radio frequency thermal plasma is a versatile process for engineering powder preparation owing to its high energy density and reactivity. Molybdenum powders were prepared from molybdenum sheet scrap by RF thermal plasma in association with powder comminution process. Molybdenum scrap which was used in high temperature environment was friable enough to be broken into micropowders by hammer milling. Spherical molybdenum micro-powder was obtained from the hammer milled powders were treated via thermal plasma. On the other hand, vaporization and condensation pathway for nanoparticle synthesis is largely dependent on both thermo-physical properties and thermal plasma properties. In this regard, molybdenum trioxide was chosen for the feedstock of nanoparticle synthesis. Additional reactivity of argon-hydrogen thermal plasma, oxide feedstock was fully reduced to bcc molybdenum. Considering different reaction pathway of each feedstock, molybdenum nanoparticle attached molybdenum spherical micro-powder could be effectively synthesized by feeding a blended feedstock of molybdenum micro-powder and molybdenum trioxide micro-powder into argon-hydrogen thermal plasma.</P>
Bae, Chulwoong,Kahng, Yong-Koo,Sohng, Hae Sung The English Teachers Association in Korea 2012 영어어문교육 Vol.18 No.1
This study explores the effects of phonological awareness instruction with phonetics on listening comprehension and speaking. For the test of measuring the improvement of listening comprehension, two nationwide listening comprehension tests were used for pre-test and post-test. To find out the improvement of speaking ability, students were required to take the Level-3 NEAT speaking tests. There was a notable correlation between phonological awareness instruction with phonetics and listening ability. Also a significant correlation between phonological awareness instruction with phonetics and speaking ability was found. The group with phonological awareness class with phonetics received higher scores in listening and speaking test than the group without phonological awareness class with phonetics in the post-test. This study implies that phonological awareness class with phonetics is helpful for the improvement of listening and speaking ability. With this research, we can also say that students' communicative competence increased.
Chung Chulwoong(정철웅) 고려대학교 한국사연구소 2015 International Journal of Korean History Vol.20 No.1
이 논문은 명ㆍ청시대 강남 지역의 전반적인 수리 체계와 당시 활발하게 전개된 수리 공사가 지닌 의의를 고찰하기 위한 것이다. 명ㆍ청 두 왕조는 대규모 준설 공사의 지속적인 시행을 통해, 국가 세수의 확보와 농민의 생산 활동 보장이라는 목적을 달성하려 했다. 그러나 수리 체계 자체의 악화, 과다한 비용, 여러계층의 이해관계 때문에 대형 수리 공사는 본래 목적을 달성하지 못했으며, 이미 16세기부터 단편적이며 현실성이 있는 소규모 수리 공사에 대한 관심이 등장했다. 한편 사회경제적 변화가 한층 더 진전된 청대에는 강남 지역에서 폭넓게 전개된 상업 작물의 확대로 수리 문제에 대한 새로운 인식이 등장하게 되었다. 이는 수리 시설에 의지한 단순한 곡물생산이 아닌 다양한 경작을 통해, 개선의 여지가 희박했던 수리시설의 압박으로부터 벗어나려 했기 때문이다. 그러므로 16세기 이후 강남 지역의 다양한 상업 작물 재배나 수공업 발전은 비효율적이었던 수리시설에서 비롯된 또 다른 양상이기도 하다. 그러나 이런 현실적인 제약과 실패에도 불구하고, 대형 수리 공사가 반복적으로 진행된 이유는 분명 江南 지역이 지닌 경제적 중요성과 함께 治水가 지닌 본래의 理想을 달성하기 위한 것이라고 할 수 있다. This paper attempts to explore the significance of the overall water control system and numerous water control projects in the Jiangnan region. Through a series of large-scale dredging projects, the Ming and Qing Dynasties attempted to achieve the goals of securing national tax revenue and guaranteeing the production activity for the farmers. However, due to the weakened hydraulic system, excessive expenses, and interests on various levels, large-scale hydraulic engineering projects were unable to achieve their original goals. Starting in the sixteenth century already, interests about practical one-time hydraulic engineering projects on a small scale began to surface. Meanwhile, in the Qing Dynasty, when the socio-economic transformation developed more, a new awareness of hydraulics surfaced due to the expansion of commercial cultivation over a large amount of land in the Jiangnan region. This was the result of an attempt to break away from the heavy dependence on water control facilities that had little room for improvement by growing a variety of plants and crops instead of focusing solely on simple grain production. Therefore the cultivation of a variety of commercial crops and plants and the development of the handicraft industry in the Jiangnan region since the sixteenth century are two aspects of Chinese society that resulted from ineffective water control facilities. However, despite these limitations and failures, large-scale hydraulic engineering projects were carried out repeatedly due to the economic importance of the Jiangnan region and to the efforts to achieve the ideals of flood control.
Recovery Of Valuable Metals In Tin-Based Anodic Slimes By Carbothermic Reaction
Han, Chulwoong,Kim, Young-Min,Son, Seong Ho,Choi, Hanshin,Kim, Tae Bum,Kim, Yong Hwan PAS 2015 ARCHIVES OF METALLURGY Vol.60 No.2
<B>Abstract</B><P>This study investigated the recovery of anodic slimes by carbothermic reaction in the temperature range of 973~1,273K and amount of carbon as a function of time. Tin anodic slime samples were collected from the bottom of the electrolytic cells during the electro-refining of tin. The anodic slimes are consisted of high concentrated tin, silver, copper and lead oxides. The kinetics of reduction were determined by means of the weight-loss measurement technique. In order to understand in detail of carbothermic reaction, thermodynamic calculation was carried out and compared with experiments. From thermodynamic calculation and experiment, it was confirmed that Sn-based anodic slime could be reduced by controlling temperature and amount of carbon. However, any tendency between the reduction temperature and carbon content for the reduction reaction was not observed.</P>
항공 라이다 데이터로부터 가변형 판정 윈도우를 이용한 지형 분류 기법
성철웅 ( Chulwoong Sung ),이성규 ( Sung Gyu Lee ),박창후 ( Chang Hoo Park ),이호준 ( Ho Jun Lee ),김유성 ( Yoo-sung Kim ) 한국정보처리학회 2010 한국정보처리학회 학술대회논문집 Vol.17 No.2
본 논문에서는 항공 라이다 데이터로부터 지형의 유형을 분류하는 과정에서 지형적 특성에 따라 분류에 사용하는 판정 윈도우의 크기를 가변적으로 조정하여 적용시키는 가변형 판정 윈도우를 이용한 지형 분류 기법을 제안하였다. 또한 실험을 통하여 가변형 판정 윈도우를 이용한 지형 분류 기법의 시간효율과 정확도를 분석하였다. 실험 결과에 따르면 제안된 가변형 판정 윈도우를 이용한 지형 분류 기법은 지형 분류에 사용되는 판정 윈도우의 개수를 줄여 지형 분류의 속도를 향상시켰기 때문에 빠른 분류 속도가 필요한 재해 피해 현황을 파악하기 위한 시스템에 적용 할 수 있을 것으로 기대된다.