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옥살산염 공침법으로 합성한 BaCe_0.9Gd_0.1O_2.95 분말 전구체의 열분해 특성
沈秀萬,錢亮汐 홍익대학교 산업기술연구소 1997 産業技術 Vol.7 No.-
BaCe_0.9Gd_0.1O_2.95 powder was synthesized from the solutions of Ba, Ce, and Gd nitrates by oxalate coprecipitation method. Thermal behavior of the powder precursor oxalate coprecipitate, was investigated using TG/DTS and XRD. The addition of an oxalic acid solution of which pH had been adjusted to 4 with NH_4ON, to a mixture of the nitric solutions yielded coprecipitates having a stoichiometric composition. The addition of an oxalic acid solution without adjusting Ph, however, failed to produce the stoichiometric composition, because all Ba ions did not precipitate. The oxalate copercipitate obtained at pH 4 was completely decomposed into BaCO_3, CeO_2, and Gd_2O_3 at ∼480℃, resulting in single phase BaCe_0.9Gd_0.1O_2.95 powder after calcination at 1000℃. The composition of the calcined powder was found to be uniform and coincide with the original composition of the starting solution.
기계적 합금화에 의해 제조된 고규소 Al-Si 합금 나노 결정의 특성
이정일,김일호,홍태환,어순철,양계준,석현광,한만갑,최국선,김준수 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.7
High silicon Al-Si alloys with nanocrystalline structures have been produced by mechanical alloying process. Microstructural changes of the Al-Si alloys were investigated by scanning electron microscopy and the transmission electron microscopy. X-ray diffraction analysis was also made to characterize the lattice constant, crystallite size and misfit strain. It was found that the effective milling time by attrition milling was about 12hours for Al-70 wt%Si alloy system. The Al and Si crystallites were reduced to about 30 nm and 70 nm, respectively, by the mechanical alloying for more than 12hours. The misfit strains increased with milling time UD to 240 hours, and saturated to 5.73×10^(-3) for Al and Si crystallites, respectively.
OPNET을 이용한 블루투스를 위한 Koinonia 적응형 계층 시뮬레이터 설계
양만석(Man seok Yang),홍진표(Jin pyo Hong),고재진(Jae jin Ko),민수영(Soo young Min) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.2Ⅲ
본 논문에서는 무선 근거리 네트워크 (Wireless Personal Area Network : WPAN) 환경에서 Koinonia 라는 새로운 시스템을 제안하고 링크계층에 적응형 계층을 추가하여 구성 및 모델링 함으로써 2.4GHz의 ISM 무선 대역을 이용하여 근거리에 위치한 무선 기기들을 연결하고 음성정보 및 데이타를 전송하는 근거리 무선 네트워크 시스템의 시뮬레이터를 구현 함을 목적으로 하였다.
국가 R&D 현황을 종합적으로 분석하기 위한 시스템에 관한 연구
양명석(Yang Myung-Seok),박만희(Park Man-Hee),주원균(Joo Won-Kyun),김태현(Kim Tae-Hun),최기석(Choi Ki-Seok),김영국(Kim Young-Kook) 한국콘텐츠학회 2007 한국콘텐츠학회 종합학술대회 논문집 Vol.5 No.1
본 논문은 국가연구개발활동과 관련된 투입ㆍ산출요소인 연구개발비, 사업ㆍ과제정보, 참여인력, 장비ㆍ기자재, 성과에 대한 종합적인 현황파악과 이를 바탕으로 OECD나 선진국들과의 비교함으로써 국제적인 수준 및 경쟁력을 비교ㆍ분석할 수 있는 시스템에 관한 설계이다. This article is a study on synthetic analysis systems design for the status of national R&D project to use R&D Project related information(R&D cost, Program, Project, R&D Human, Equipment, Result) and to support how much international competitive power we have by comparing with OECD's R&D Project.
( Bo-seok Yang ),( Myeong Hyeon Kim ),( Jung-seok Choi ),( Sang Keun Jin ),( Man-jong Park ),( Young-min Song ),( Chul Young Lee ) 한국축산학회(구 한국동물자원과학회) 2019 한국축산학회지 Vol.61 No.1
Little is known about the effects of the plane of nutrition on growth performance and meat quality of grow-finish pigs under commercial production conditions. The present study was thus addressed to this virtually unanswered question. One hundred and two barrows and 102 gilts weighing approximately 24 kg were fed phase I and II grower diets with a high, medium, or low plane of nutrition (HP, MP, or LP) to approximately 43 and 70 kg, respectively, in 6 replicates (pens). Subsequently, the HP and MP groups were fed the HP and MP1 finisher diets, respectively, the LP group being fed a second MP (MP2) finisher diet (LP1 group). Moreover, 68 LP-grower-fed barrows and gilts were added to the feeding trial and fed the MP1 and LP finisher diets to approximately 95 kg and thereafter, respectively (LP2 group). All MP diets had the lysine:calorie ratios comparable to the RNC recommendations, with < 18% differences between those of the HP and LP diets. The finisher pigs were reared in 16 pens and slaughtered at approximately 115 kg. The gain:feed ratio, but not average daily gain (ADG), was greater for the HP group than for the MP and LP during the grower phase I whereas during the grower phase II, ADG was greater (p < 0.05) for the HP and LP groups vs. MP. During the finisher phase I, ADG was less for the LP (LP1 + LP2) group vs. HP and MP, with no difference between the HP and MP groups; the gain:feed ratio was less for the LP vs. MP group. Backfat thickness was greater for the LP vs. HP group. The water holding capacity of fresh longissimus dorsi muscle (LM) and the sensory juiciness score for cooked LM were greatest for the LP group, the sensory flavor and tenderness scores being greater for the LP group vs. MP. In conclusion, results suggest that compensatory growth occurred for the LP and MP groups during the grower phase II and finisher phase I, respectively, with fat deposition increased for the LP group and that meat quality could be improved by the use of LP.
Measuring abutment convergence angles using stereovision dental image processing system
Yang, Hong-Seok,Park, Ji-Man,Han, Jung-Suk,Lee, Jai-Bong,Kim, Sung-Hun,Yeo, In-Sung The Korean Academy of Prosthodonitics 2014 The Journal of Advanced Prosthodontics Vol.6 No.4
PURPOSE. The purpose of this study was to develop a dental image processing system using a three-dimensional (3D) camera and stereovision technology. The reliability of the system for measuring axial wall convergence angles was evaluated. MATERIALS AND METHODS. The new system predicted 3D coordinate points from 2D images and calculated distances and angles between points. Two examiners measured axial wall convergence angles for seven artificial abutments using a traditional tracing-based method (TBM) and the stereovision-based method (SVBM). Five wax abutment models of simplified abutment forms were made and axial wall convergence angles of wax models were measured by both methods. The data were statistically analyzed at the level of significance, 0.05. RESULTS. Intraclass correlation coefficients showed excellent intra-examiner and inter-examiner reliabilities for both methods. Bland-Altman plots and paired t-tests showed significant differences between measurements and true values using TBM; differences were not significant with SVBM. CONCLUSION. This study found that the SVBM reflected true angle values more accurately than a TMB and illustrated an example of 3D computer science applied to clinical dentistry.
Yang, Jung-Seok,Kwon, Man Jae,Choi, Jaeyoung,Baek, Kitae,O’Loughlin, Edward J. Elsevier 2014 CHEMOSPHERE - Vol.117 No.-
<P><B>Abstract</B></P> <P>Electrokinetic remediation (also known as electrokinetics) is a promising technology for removing metals from fine-grained soils. However, few studies have been conducted regarding the transport behavior of multi-metals during electrokinetics. We investigated the transport of As, Cu, Pb, and Zn from soils during electrokinetics, the metal fractionation before and after electrokinetics, the relationships between metal transport and fractionation, and the effects of electrolyte conditioning. The main transport mechanisms of the metals were electroosmosis and electromigration during the first two weeks and electromigration during the following weeks. The direction of electroosmotic flow was from the anode to the cathode, and the metals in the dissolved and reducible-oxides fractions were transported to the anode or cathode by electromigration according to the chemical speciation of the metal ions in the pore water. Moreover, a portion of the metals that were initially in the residual fraction transitioned to the reducible and soluble fractions during electrokinetic treatment. However, this alteration was slow and resulted in decreasing metal removal rates as the electrokinetic treatment progressed. In addition, the use of NaOH, H<SUB>3</SUB>PO<SUB>4</SUB>, and Na<SUB>2</SUB>SO<SUB>4</SUB> as electrolytes resulted in conditions that favored the precipitation of metal hydroxides, phosphates, and sulfates in the soil. These results demonstrated that metal removal was affected by the initial metal fractionation, metal speciation in the pore solution, and the physical–chemical parameters of the electrolytes, such as pH and electrolyte composition. Therefore, the treatment time, use of chemicals, and energy consumption could be reduced by optimizing pretreatment and by choosing appropriate electrolytes for the target metals.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Metal fractionation during EK was changed by a suite of physical–chemical processes. </LI> <LI> Metal transport during EK was controlled by the metal speciation/fractionation. </LI> <LI> Electrolyte-conditioning for EK enhanced selectivity in metal removal. </LI> <LI> Simultaneous removal of multi-metals was not effective in single-electrolyte conditioning. </LI> </UL> </P>