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다층 PVD 코팅을 이용한 SKD 61다이캐스팅 강의 표면 특성 비교 분석
김승욱,Kim, Seung Wook 한국반도체디스플레이기술학회 2021 반도체디스플레이기술학회지 Vol.20 No.2
The properties of materials which are widely used in industry fields like automobile, shipbuilding, casting, and electronics are strongly needed to have higher surface hardness, lower surface roughness, and higher compressive residual stress. As mentioned above, for the purpose of satisfying three factors, a variety of researches with respect to surface improvement have been actively studied and applied to every industry. SKD61 which is mostly used for die casting process of cold chamber method must meet a countless number of problems which are thermal, mechanical and chemical from highly specific working environment at high temperature over 600℃. Above all, in case of plunger sleeves used for die casting process, thermal fatigue has a bad effect on the surface of an inlet where molten metal is repeatedly injected. On account of it, plunger sleeves cause manufacturers to deteriorate quality of products. Therefore, in this paper, to improve the surface of an inlet of plunger sleeve, multilayer PVD coating using Ti, Cr and Mo is suggested. Furthermore, The surface characteristics such as surface roughness(Rsa, Rsq), surface hardness(HRB, HRC) and residual stress using XRD(X-ray diffractometer) of coated samples and specimens are studied and discussed.
U-Healthcare를 위한 Visualization Engine 개발
김승욱,김민철,Kim, Seung-Wook,Kim, Min-Cheol 한국정보통신학회 2008 한국정보통신학회논문지 Vol.12 No.10
최근 웰빙, 건강 등을 추구하는 보건의료분야에 대한 관심이 증가하면서, 언제, 어디서나 자신의 건강에 대한 상태를 모니터링 할 수 있도록 가능하게 하는 u-Healthcare 서비스가 주목받고 있다. 기존의 의료정보시스템은 측정값의 저장과 단순 디스플레이만이 지원되는 구조로 구성되어 있으나, 이러한 의료정보시스템에서 사용자가 편리하고 효율적인 상태확인이나 진단을 하기 위해서는 원하는 의료정보를 빠르고 정확하게 제공해주도록 원활한 상호 작용을 해야 할 필요성이 있다. 이와 관련하여 본 연구결과는 u-Healthcare의 다양한 서비스에서 보다 사용자 친화적(user-friendly)이면서도 더 나은 정보변별력을 제공하는 Visualization Engine에 대한 개발적 내용을 제시하였다. As the interest on healthcare area in pursuit of well-being, health etc is increasing, u-Healthcare service that can monitor the condition of oneself's health anytime & anywhere is getting an attention. The existing health information system is consist of structure supporting the storage of estimation value and just simple display. But this needs to get a harmonious interaction to provide the health information exactly and speedily for efficient condition confirmation and diagnosis in health information system, In relation to this, this study proposed the developmental contents about visualization engine providing the beuer information discrimination and more user-friendly in various service of u-Healthcare.
스핀코터 회전속도에 따른 탄탈륨 박막두께의 선형모델에 관한 연구
김승욱,Kim, Seung Wook 한국반도체디스플레이기술학회 2020 반도체디스플레이기술학회지 Vol.19 No.1
Recently, the decrease in thin film thickness has been actively studied by changing several physical elements such as the increase in revolution velocity of lower substrate equipped with AC or DC motor. In this paper, we propose a novel spin coater control system that changes AC or DC motor and common use software with limitation of velocity and position control into step motor and LABVIEW software based on GUI to control revolution velocity and position more precisely. By determining six input values of rotation velocity 1, 5, 10, 25, 50, 100 PPS, we fabricated six samples using coating target, TA(tantalum) on silicon substrate and measured their thin film thickness by SEM. Hence, this research can be applied to inferring thin film thickness of tantalum regarding any value of revolution velocity without additional experiments and for linear reference model via property analysis of thin film thickness using other thin-film materials.
김승욱,유희경,정인철,김태우,Kim, Seung-Uk,You, Hee-Gyeong,Jeong, In-Cheol,Kim, Tai-Woo 한국사물인터넷학회 2016 한국사물인터넷학회 논문지 Vol.2 No.4
소비자가 각 편의점에서 제공하는 제품과 행사 상품 등을 값싸게 구매하기 위해서는 해당 편의점의 홈페이지를 들어가거나 직접 방문하여 찾아야 한다. 본 연구에서는 각 편의점에서 어떤 제품이 행사 상품이며, 어떤 편의점에서 어떤 서비스를 제공하는지 여부를 검색하는 앱 프로그램을 개발한다. 본 앱을 사용하여 사용자는 여러 편의점에서 제공하는 행사 정보를 비롯한 각종 서비스를 실시간을 검색할 수 있다. In order for consumers to purchase products and event products offered at each convenience store at a low price, visitors should visit the convenience store's homepage or visit the store directly. In this study, we developed an app program for each convenience store to find out which products are event products and which services are provided at certain convenience stores. Using this app, users can search real-time on various services including event information provided by various convenience stores.
상기생과 봉독이 간암 세포주 Hep G2에 대해 미치는 항암 기전 비교
김승욱,김보람,허경,임성우,Kim, Sung-Uk,Kim, Bo-Ram,Heo, Kyung,Lim, Seong-Woo 대한한방내과학회 2009 大韓韓方內科學會誌 Vol.30 No.4
Background and Objectives : Korean mistletoe lectin (Viscum album coloratum agglutinin, VCA) and bee venom (BV) have been reported to induce apoptosis in various cancer cell lines in vitro and to show antitumor activity against a variety of tumors in animal models. However, the comparative effect of VCA and BV on the anti-cancer effect and mechanisms of action has not been determined. In this study, the effect in a human hepatocellular carcinoma cell line, Hep G2 cells, was examined. Methods : Cytotoxic effects of VCA and BV on Hep G2 cells were determined by 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) assay in litro. The apoptotic cell death was then confirmed by propidium iodide staining and DNA fragmentation analysis. The mechanisms of action were examined by the expression of anti-apoptotic proteins and activation of mitogen-activated protein kinases. The involvement of kinase was examined in VCA or BV-induced apoptosis by using kinase inhibitors. Results : VCA and BV killed Hep G2 cells in a time and dose-dependent manner. Treatment of Hep G2 cells with VCA activated poly (ADP-ribose) polymerase-1 (PARP-1) known as a marker of apoptosis, and mitogen-activated protein kinases signaling pathways including MAPK/ERK, p38 MAPK and JNK. BV also activated PARP-1, MAPK/ERK. and p38 MAPK but not JNK. The expression level of anti-apoptotic molecule, Bcl-X, was decreased by VCA treatment but not by BV. Finally, the phosphorylation level of ERM proteins involved in the cytoskeleton homeostasis was decreased by both stimuli. VCA-induced apoptosis was partially inhibited by in the presence of JNK and p38 inhibitor, but BV only by p38 inhibitor. Conclusions : VCA-induced apoptosis is dependent on the activation of p38 and JNK. while BV-induced apoptosis is mediated by p38 activation in Hep G2 cells.
다양한 형태의 멀티미디어 데이터를 위한 통신 프로세서의 효율적 관리 방법에 대한 연구
김승욱,김성천,Kim, Sung-Wook,Kim, Sung-Chun 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.1B
본 논문에서는 멀티미디어 네트워크상에서 우선순위가 높은 서비스의 QoS를 보장하며 동시에 프로세서의 에너지 효율을 최대화하는 적응적 온라인 프로세서 관리기법을 제안하였다. 이 기법은 현재 네트워크의 트래픽 상황을 기반으로 하여 실시간으로 프로세서를 관리한다. 제안된 방법의 가장 큰 특징은 상호 상충하는 다양한 성능 메트릭들 사이에 적정한 균형을 이루어 안정적으로 시스템을 운영하는데 있다. 컴퓨터 시뮬레이션을 통하여 기존에 제안된 프로세서 관리기법에 비해 본 논문에서 제안된 방법이 다양한 트래픽 상황에서 우수한 성능을 가지는 것을 확인할 수 있었다. In this paper, we propose new on-line processor management algorithms that manage heterogeneous multimedia services while maximizing energy efficiency. These online management mechanisms are combined in an integrated scheme for higher system performance and energy efficiency. The most important feature of our proposed scheme is its adaptability, flexibility and responsiveness to current network conditions. Simulation results clearly indicate the superior performance of our proposed scheme to strike the appropriate performance balance between contradictory requirements.