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Dong Uk Choe(최동욱),Byung Ki Park(박병기),Jang-Jung Kim(김장중),Dong Soo Kim(김동수) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Pd(Ⅱ) catalytic ink was synthesised by the hydrolysis of PdCl₂, followed by treatment with a small amount of stabilizing agent. The Pd(Ⅱ) ink has excellent storage stability and the same low viscosity and surface tension as water. Polyimide film was used as a substrate for inkjet printing of the Pd(Ⅱ) ink, while various characteristic changes of the printing were observed according to the contact angle on the substrate surface. The contact angle was affected by the concentration of KOH solution, and a surface condition suitable for composing Copper circuit was obtained by printing Pd(Ⅱ) catalyst ink and electroless plating when it was treated in 1M KOH solution for 10 minutes. The physical properties of Pd (II) ink were analyzed using a surface tension meter, viscometer, pH meter and UV-visible spectrophotometer, whereas the surface properties of polyimide film were analyzed using a contact angle instrument, FTIR-ATR, video microscope, XPS, FESEM and AFM. The physical properties of Pd (0) particles were analyzed by XPS and AFM, while the characteristics of electroless copper plating were analyzed by video microscope and XPS.
니켈계 초내열 단결정 주조 합금의 고온압축변형에 따른 미세조직변화 연구
최종수,허무영,안성욱,진영훈,임옥동,서동이 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.1
Nickel-based single crystal superalloy shows directional coarsening which has been explained by the interaction of interface dislocation and composition in matrix. After compression test at 700, 800℃ and 900℃, γ' precipitates were observed on (001) and (010) planes through scanning and transmission electron microscopes. Strains of γmatrix and γ' precipitate were measured using XRD. (010)plane exhibited the increasing tendency of directional coarsening of γ precipitate with increasing temperature. Due to the interaction of dislocation and Cr, Co diffused into matrix channel perpendicular to stress axis. γ' precipitates were sheared by dislocations along the direction parallel to stress axis and showed faster rate of strain with increasing temperature compared to γmatrix, which was never seen at low stress state such as in creep test. So it was concluded that stress intensity and temperature affected microstructure of γ' precipitates.
崔炳熙,金東旭 서울대학교 1962 서울대학교 論文集 Vol.12 No.-
This report is prepared to find how the cocoon bave of filament size deviation relates with the raw silk made by them which are intensively cultured in this country. Three recommended hybrid varieties and two varieties under working at Suwon Sericultural Experiment Station were selected as specimens. The cocoons were reeled as an indivisual filament of every fifty meters long skein with a wrap reel to weigh the denier and to investigate the relationship of the above statement so that it may be used for the quality estimation before processing it into raw silk. The conclusions obtainde are as followings. (1) The variety of Pk x Sn was found as best cocoon 21 denier raw silk use but the number of cocoon to make the denier has to be eight which might cause more labor cost. (2) Baektoo-Kumkang and Myohiang-Chongchon were found as economical varieties for 21 denier use. (3) Seulak-Soyang is a proper variety for the use of 14 or 28 denier silk use. (4) Myohiang-Chongchon did not confirm a good property from the aspect of denier deviation. (5) It was found that there was a fairly strong corelationship between the mean cocoon bave size and the total cocoon bave size deviation as indicated by Ono's report. (6) Three graphs were prepared to estimate the cocoon quality before processing into various sizes of raw silk using the mean cocoon bave size and the raw silk size to be prepared. (7) Mean time, the graph which is able to estimate the expectable grade of the raw silk size divation was designed for the practical use. (8) The expectable grade of the varieties used in this report were found as following data. ◁표삽입▷(원문을 참조하세요.) (9) The result of the work concerning the expectable denier deviation on 21 denier silk was the same with the statistical actural testing result as 1.25 D while the distribution showed further necessity of improvement in technicallity.
Kim, Dong-Uk,Park, Sang-Hee Ko,Choe, Heehwan,Jeon, Jae-Hong American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.11
<P>As well as a parallel shift, the hump effect is also found in the transfer curve of amorphous indium gallium zinc oxide thin film transistors (a-IGZO TFTs) after gate bias stress. The capacitance voltage (C-V) curve is also deformed from its initial shape after the stress. This study analyzes both the C-V and transfer curves based on the same gate voltage axis to investigate the mechanism driving the hump generation. The origin of the hump effect seems to have little relationship with the electron trapping in the gate insulator. It is deduced that an additional interface trap generation occurs at the a-IGZO interface during gate bias stress test, thereby explaining the origin of the hump effect.</P>
Reversible synthesis of colloidal aluminum oxyhydroxide nano platelets from aluminum oxides
박병기,Dong Uk Choe 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.2
Aluminum oxyhydroxide (AlO(OH)) nano platelets were prepared through a hydrothermal reaction of γ-Al2O3 particles and a diluted CH3COOH solution. In the hydrothermal reaction process, a reversible reaction between γ-Al2O3 and aluminum oxyhydroxide occurred, and the hydrothermal reaction temperature, hydrothermal reaction time, CH3COOH concentration and the Al2O3/H2O ratio had an effect on a crystal structure, surface chemical properties, specific surface area, pore characteristics and crystal morphology of the aluminum oxyhydroxide nano platelets. In this study, the hydrothermal reaction conditions of the aluminum oxyhydroxide nano platelets for used as a catalyst support, a heat resisting agent, adsorbent, binder, polishing agent and a coating agent were investigated. The crystal structure, specific surface area, pore volume and the pore size of the aluminum oxyhydroxide nano platelets were investigated by XRD, TEM, TG/DTA, FT-IR and the N2 BET method at liquid nitrogen temperature.
VoIP를 위한 적응적 FEC 기반 에러 제어 알고리즘
최태욱,정기동,Choe, Tae-Uk,Jeong, Gi-Dong 한국정보처리학회 2002 정보처리학회논문지 C : 정보통신,정보보안 Vol.9 No.3
현재의 인터넷은 가변적인 대역폭과 패킷손실 그리고 지연으로 인하여 대화식 응용의 QoS 보장이 어렵다. 특히 최근에 정보의 기반구조로 중요성이 강조되고 있는 VOIP는 패킷손실률과 종점간지연이 클 때 통화품질이 크게 떨어지므로 네트웍 수준에서나 응용 수준에서 에러제어 기법이 요구된다. 인터넷 전화와 같은 대화식 응용을 위한 응용 수준의 에러 제어 기법으로 FEC(Forward Error Correction)가 가장 많이 사용되고 있는데, 이 기법은 주정보와 더불어 부가정보를 전송함으로서 패킷손실을 복구하는 방법으로 네트웍의 상태에 따라 적응적으로 부가정보의 양을 조절한다. 그러나 기존의 알고리즘들은 패킷손실률만을 고려하여 부가정보를 조절하였으며 부가 정보를 증가시킬 때 수반되는 종점간지연을 간과함으로써 통화품질을 떨어뜨리는 단점이 있다. 본 논문에서는 패킷손실률뿐만 아니라 종점간지연을 고려하는 FEC기반 에러제어 기법인 SCCRP (Selecting a Codec Combination using Reward and Penalty)를 제안한다. 실험 결과, SCCRP는 다른 알고리즘들에 비해 복구 후 패킷손실률은 물론 복구 후 종점간지연을 낮게 유지하였다. In the current Internet, the QoS of interactive applications is hardly guaranteed because of variable bandwidth, packet loss and delay. Moreover, VoIP which is becoming an important part of the information infra-structure in these days, is susceptible to network packet loss and end-to-end delay. Therefore, it needs error control mechanisms in network level or application level. The FEC-based error control mechanisms are used for interactive audio application such as VoIP. The FEC sends a main information along with redundant information to recover the lost packets and adjusts redundant information depending on network conditions to reduce the bandwidth overhead. However, because most of the error control mechanisms do not consider end-to-end delay but packet loss rate, their performances are poor. In this paper, we propose a new error control algorithm, SCCRP, considering packet loss rate as well as end-to-end delay. Through experiments, we confirm that the SCCRP has a lower packet loss rate and a lower end-to-end delay after reconstruction.