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Al-6.2wt.%Si 합금의 등온교반시간에 따른 미세조직변화
이정일,박지호,김긍호,이호인 ( Jung Ill Lee,Ji Ho Park,Gyeung Ho Kim,Ho In Lee ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.5
N/A The microstructural evolution with isothermal stirring during semi-solid state processing of hypoeutectic Al-6.2wt%Si alloy was studied. Substructure of the individual primary solid particle in the slurry was investigated through transmission electron microscopy(TEM). Formation of subgrain boundaries on the rheocast Al-6.2wt%Si alloy is observed and the misorientation between the grains is shown typically under 2 degrees by analyzing selected area diffraction (SAD) and convergent beam electron diffraction (CBED) patterns. The existence of high angle grain boundaries are also observed in the alloy. Based upon these observations, mechanisms for the primary particles fragmentation are considered. With isothermal stirring, the dislocation density increases, and the evolution of dislocation cell structure takes place, which is interpreted as a process of achieving uniform deformation by dynamic recovery under applied shear stress.
이정일,박지호,이호인,김문일 ( Jung Il Lee,Ji Ho Park,Ho In Lee,Moon Il Kim ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.5
N/A The effect of various thermomechanical treatments on the structure and rheological behaviour of Al-6.2wt%Si alloy in its solidification range were investigated using a Searle type high temperature viscometer. During continuous cooling, the viscosity increases gradually with increasing fraction of solidified alloy, until a critical fraction of solidified alloy is reached above which the viscosity sharply increases. The viscosity of the slurry, at a given volume fraction wolid, decreased with increasing shear rate. The size and morphology of primary solid particles during stirring is influenced strongly by shear rates, cooling rates, volume fraction and stirring time of solid. Morphological changes during stirring as a function of solid volume fractions, shear rate and processing time were also reported. In this study, the size of primary solid particles in these alloys consistently increases and the it`s aspect ratio decrease with the increase in fraction solid and decrease in shear rate. Crystal morphology changes from rosette type to spheroid type with the increase in shear rate and solid fraction.
이정일,김태완,신지영,류정호,Lee, Jung-Il,Kim, Tae Wan,Shin, Ji Young,Ryu, Jeong Ho 한국결정성장학회 2015 한국결정성장학회지 Vol.25 No.2
Mn-Co-Ni oxide system has been used as the NTC thermistors for normal temperature applications. Mn-Co-Ni oxide-based thermistors were sintered at different temperatures for a constant processing time from 900 to $1300^{\circ}C$ for 3 h. The crystal structure, bulk density, microstructure and chemical composition were characterized by XRD, FE-SEM and WD-XRF. The plot of the resistance versus measuring temperature was characterized for the sintered sample at the $1250^{\circ}C$. Moreover, the relationship between log resistivity and reciprocal of absolute temperature of the NTC thermistor was investigated. 상온용 NTC 서미스터로는 주로 Mn-Co-Ni 산화물계가 주료 사용된다. 본 연구에서는 Mn-Co-Ni 산화물계 분말을 이용하여 상온에서 가압 성형하여 $900{\sim}1300^{\circ}C$ 온도범위에서 3시간 동안 소결하여 서미스터 소자를 제작하였다. 소결온도에 따른 서미스터 세라믹 샘플의 상변화, 소결밀도, 미세구조 및 원소함량비 변화를 고찰하였다. $1250^{\circ}C$에서 소결된 Mn-Co-Ni 서미스터 소자에 대하여 온도에 대한 저항특성을 측정하였으며, 측정되는 절대온도의 역수와 저항의 로그함수값에 대한 변화를 고찰하였다.
옥시불화이트륨 분말의 고상합성 및 플라즈마 스프레이 코팅 적용
이정일,김영주,채희라,김윤정,박성주,신경선,하태빈,김지현,정구훈,류정호,Lee, Jung-Il,Kim, Young-Ju,Chae, Hui Ra,Kim, Yun Jeong,Park, Seong Ju,Sin, Gyoung Seon,Ha, Tae Bin,Kim, Ji Hyeon,Jeong, Gu Hun,Ryu, Jeong Ho 한국결정성장학회 2021 한국결정성장학회지 Vol.31 No.6
반도체 회로를 제조하기 위해서 에칭, 세척, 증착 등의 공정들이 반복적으로 진행된다. 따라서 이러한 공정이 진행되면 진공장비 내부는 부식성이 높은 가혹한 플라즈마 환경에 노출되게 된다. 따라서 반도체 공정 장비의 내부를 플라즈마 노출에 강한 재료를 사용하여 코팅층의 에칭과 오염 입자의 생성을 최소화하여야 한다. 본 연구에서는 고상합성법에 의해 Y<sub>2</sub>O<sub>3</sub>와 YF<sub>3</sub> 분말을 원료물질로 옥시불화이트륨(YOF)를 성공적으로 합성하였다. Y<sub>2</sub>O<sub>3</sub>와 YF<sub>3</sub> 분말의 혼합비율은 1.0:1.0에서 1.0:1.6까지 조절하였으며, 혼합비율이 합성된 YOF 분말의 결정구조와 미세구조에 미치는 영향을 XRD와 FE-SEM으로 조사하였다. 합성된 YOF 분말을 이용하여 알루미늄 기판에 플라즈마 스프레이법으로 성공적으로 코팅하였다. In order to manufacture a semiconductor circuit, etching, cleaning, and deposition processes are repeated. During these processes, the inside of the processing chamber is exposed to corrosive plasma. Therefore, the coating of the inner wall of the semiconductor equipment with a plasma-resistant material has been attempted to minimize the etching of the coating and particle contaminant generation. In this study, we synthesized yttrium oxyfluoride (YOF) powder by a solid-state reaction using Y<sub>2</sub>O<sub>3</sub> and YF<sub>3</sub> as raw materials. Mixing ratio of the Y<sub>2</sub>O<sub>3</sub> and YF<sub>3</sub> was varied from 1.0:1.0 to 1.0:1.6. Effects of the mixing ratio on crystal structure and microstructure of the synthesized YOF powder were investigated using XRD and FE-SEM. The synthesized YOF powder was successfully applied to plasma spray coating process on Al substrate.
이정일(JI Lee),주괄(K Ju),김만성(MS Kim),황호연(HY Hwang),황익하(IH Whang),이숙환(SH Lee) 대한산부인과학회 1982 Obstetrics & Gynecology Science Vol.25 No.4
위장에서 발생한 것으로 사료되는 1례로 난소뿐 아니라, 피부에까지 전이된 비교적 희귀한 양측성인 전이성 종양을 경험하였기에 보고하고 간단한 문헌적 고찰을 하였다. A extremely rare case of Krukenbergs tumor in ovary being probably primary site in the stomach, which metastatic to the skin. The patient were 49 years old woman living now after surgery, and here we represent case report and review of literatures was made being briefly.
이정일(Lee, Jung-Il),강혜연(Kang, Hye-Yon),이지연(Lee, Ji-Yeon),김광미(Kim, Kang-Mi),이연숙(Lee, Yeun-Sook) 한국실내디자인학회 2011 한국실내디자인학회 학술대회논문집 Vol.13 No.1
If residents voluntarily plan their own community center based on their local human resources and material assets not only to realize their ideals of life but also to establish their own community, they can bring forth immense effects in terms of securing physical space, changing behavioral attitude of local residents regarding their social interest and participation and reinforcement of individual capabilities. For this purpose, based on literature research and practical case survey, this study tried to find out the practical community space design process including resident participatory space design techniques and the tools made with effective organization of such techniques. These space design techniques and tools were developed on the conceptual base of simplicity, flexibility and applicability in order to make the non-expert local residents recognize friendly, to draw the attention of the residents, and to promote their voluntary participation. With a view to achieving process for resident friendly community space design, case studies were carried out on new tools by applying most advanced digital techniques to such existing techniques as local assets diagnosis, community space module and space allocation game, and these techniques and tools were applied to the practical process stage. These resident friendly design techniques enable the effective sharing of roles and prompt and precise communication among the public sectors, experts and residents, thus achieving an efficiency and rationalization in the process of planning a community center. Such techniques and tools were proposed as alternatives applicable for various cases in the future.
울산 산단지역 PM2.5 중 중금속 노출에 의한 건강위해성평가
정지윤(Ji-Yun Jung),이혜원(Hye-Won Lee),박시현(Si-Hyun Park),이정일(Jeong-Il Lee),윤단기(Dan-Ki Yoon),이철민(Cheol-Min Lee) 한국환경보건학회 2023 한국환경보건학회지 Vol.49 No.2
Background: When particles are absorbed into the human body, they penetrate deep into the lungs and interact with the tissues of the body. Heavy metals in PM2.5 can cause various diseases. The main source of PM2.5 emissions in South Korea’s atmosphere has been surveyed to be places of business. Objectives: The concentration of heavy metals in PM2.5 near the Ulsan Industrial Complex was measured and a health risk assessment was performed for residents near the industrial complex for exposure to heavy metals in PM2.5. Methods: Concentrations of heavy metals in PM2.5 were measured at four measurement sites (Ulsan, Mipo, Onsan, Maegok) near the industrial complexes. Heavy metals were analyzed according to the Air Pollution Monitoring Network Installation and Operation Guidelines presented by the National Institute of Environmental Research. Among them, only five substances (Mn, Ni, As, Cd, Cr6+) were targeted. The risk assessment was conducted on inhalation exposure for five age groups, and the excess cancer risk and hazard quotient were calculated. Results: In the risk assessment of exposure to heavy metals in PM2.5, As, Cd, and Cr6+ exceeded the risk tolerance standard of 10–6 for carcinogenic hazards. The highest hazard levels were observed in Onsan and Mipo industrial complexes. In the case of non-carcinogenic hazards, Mn was identified as exceeding the hazard tolerance of 1, and it showed the highest hazard in the Ulsan Industrial Complex. Conclusions: This study presented a detailed health risk from exposure to heavy metals in PM2.5 by industrial complexes located in Ulsan among five age groups. It is expected to be utilized as the basis for preparing damage control and industrial emission reduction measures against PM2.5 exposure at the Ulsan Industrial Complex.
산업 환경에서의 실시간 주기 무선 I/O 노드들을 위한 동적 GTS 할당 기법에 대한 연구
이정일(Jung-il Lee),정지원(Ji-won Jung),김동성(Dong-sung Kim) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.10
본 논문에서는 산업용 무선 제어네트워크의 네트워크 이용률과 가용 무선 I/O 노드 수를 동시에 중대시길 수 있는 동적 GTS할당 기법을 제안하였다. 모의실험을 통해, 제안된 동적 GTS할당 기법이 가용 노드수와 네트워크 이용률의 향상시킴을 살펴 볼 수 있다.
지그비 망 기반의 무선 제어망 설계를 위한 실시간 전송 기법에 대한 연구
이정일(Jung-Il Lee),정지원(Ji-Won Jung),김동성(Dong-Sung Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
In this paper, a transmission algorithm based on Zig bee Networks is proposed. The superframe of IEEE 802.15.4 is applied to the transmission method of real-time mixed data (periodic data, sporadic data, and non real-time message). The simulation results show the real-time performance of spo radic data is improved by using the proposed transmission algorithm.