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Silicon MEMS probe using a simple adhesive bonding process for permittivity measurement
Kim, Jung-Mu,Oh, Dong Hoon,Yoon, Jeonghoon,Cho, Sungjoon,Kim, Namgon,Cho, Jeiwon,Kwon, Youngwoo,Cheon, Changyul,Kim, Yong-Kweon IOP 2005 Journal of micromechanics and microengineering Vol.15 No.11
<P>We developed a silicon MEMS probe for permittivity measurements using an adhesive bonding process. Only two photolithographic masks are required to fabricate the probe, which can be implemented through simple bonding processes using silicon substrates and a benzo cyclo butene (BCB) adhesive layer. Undoped silicon substrates with thicknesses of 300 ?m are used as the dielectric layers of the proposed probe. BCB layers, which have good electrical properties at high frequencies as well as adhesive properties for the bonding process, play the role of bonding materials between the two silicon substrates. The length of the probe is 30 mm, and the aperture located at the tip of the probe is 1.1 mm ? 0.62 mm. The permittivity of 0.5% saline was measured, and the results agreed with the values obtained through the Cole–Cole equation. To validate the feasibility of this probe for practical biological applications, we also performed <I>in vivo</I> measurements of the muscle, skin and blood of mice. Due to the simple fabrication process, the cost of the probe can be reduced in comparison with the previous micromachined probe (<A article='0960-1317/15/3/015'>Kim <I>et al</I> 2005 <I>J. Micromech. Microeng.</I> <B>15</B> 543–50</A>) as well as the conventional laser machined probe. Low cost leads to disposability, which is an important factor for practical biomedical applications; and thus, coupled with the probe's capabilities of MMIC integration and CMOS compatibility, this probe has excellent potential in the field of microwave permittivity measurements.</P>
A visual-sharing switching device supporting programmable in-network content adaptation
Namgon Kim,Jae-Yong Yoo,Kim, N. L.,JongWon Kim IEEE 2012 IEEE transactions on consumer electronics Vol.58 No.2
<P>To share visual contents among various network-enabled consumer devices in home, the visual content needs to be adapted according to the consumer device that plays the contents. Due to heterogeneity of consumer devices and content formats, content adaptation becomes challenging and cannot be achieved with several fixed content adaptation functionalities. In this paper, we present a visual-sharing switching device supporting programmable in-network content adaptation for in-home distribution of visual content. It provides computing and networking resources and its switching software supports building of custom data plane for visual content. We prototype the visual-sharing switching device and verify that it can be flexibly programmed to support various visual-sharing scenarios.</P>
김남곤(Namgon Kim),성기열(GiYeul Sung),김도종(DoJong Kim) 한국정보기술학회 2021 한국정보기술학회논문지 Vol.19 No.6
Modern in-vehicle networks of military UGVs(unmanned ground vehicles) are moving toward ethernet to overcome the limitations of legacy in-vehicle networking technologies. However, as the ethernet is well-known and widely-used, it is very likely to be exposed to security threats. To protect UGVs from the threats, a strong counterplan is required that could block access from unpreviledged endpoints and allow communications only between endpoints with proper access rights. In this paper, we propose an in-vehicle network security solution based on SDN(Software-Defined Networking) which defines networking based on software applications of a centralized network controller. We will show that it can block security attacks of in-vehicle ethernet networks without introducing additional firewalls by managing endpoints and allows connections approved for operating the UGV.
4K 초고해상도 미디어 전송을 위한 GPU 기반 실시간 DXT 압축 모듈 설계 및 구현
김남곤(Namgon Lucas Kim),김종원(JongWon Kim) 한국정보과학회 2011 한국정보과학회 학술발표논문집 Vol.38 No.2D
HD (1920x1080)를 뛰어 넘어 4K (4096x2160)와 같은 초고해상도 (UHD: Ultra High Definition) 미디어를 실시간으로 획득/처리/전송하는 방법의 중요성은 점차적으로 증가하고 있으며 많은 관심이 집중되고 있다. 4K 미디어를 압축하지 않고 네트워크로 전송하면 명목상으로 6Gbps 수준의 대역폭이 필요하므로 효율적인 네트워킹을 위해 미디어를 압축하여 전송해야 한다. 수신 단에서 그래픽 카드 GPU (Graphic Processing Unit)의 가속 (acceleration) 기능을 이용하도록 개발된 DXT (DirectX Texture) 압축 기법은 경량(lightweight)의 소프트웨어 중심 부호화 방법으로 PC 기반 압축/전송 환경에 쉽게 적용되는 실용적인 기법으로 알려져 있다. 하지만 부호화 머신에 탑재된 CPU의 계산 성능에 따라서 HD급 미디어를 실시간으로 압축/전송의 가능 여부가 달라지며 일반적인 듀얼코어 CPU 급의 머신에서는 실시간 처리가 어렵다. 따라서 GPU의 병렬연산 기능을 활용하는 CUDA (Computer Unified Device Architecture) 프로그래밍을 통하여 DXT 압축을 빠르게 처리하는 방식이 개발되었으며 본 논문에서는 이를 HD의 4배 규모인 4K 급으로 저지연 (low-latency) 실시간성을 개선하면서 확장하기 위해 파이프라이닝 기법의 적용을 포함하는 실시간 DXT 압축모듈을 설계/구현하고 성능을 평가한다.
김남곤 ( Namgon Kim ),김지현 ( Jee-hyun Kim ) 한국생산성학회 2018 生産性論集 Vol.32 No.1
This study investigates the effect of investment of venture capital(hereafter, VC) on the underpricing of initial public offerings(hereafter, IPO). In order to examine the certification role of VC involvement in the IPO market, this paper compare the stock price response to VC backed IPOs and to non-VC backed IPOs. Since VCs expect to recoup their investment through successful IPOs, they have incentives to provide administrative, marketing and managerial support to the issuing firm. They can also reduce the agency problems, such as moral hazard, by monitoring large shareholders. According to the certification theory, the involvement of VC investment sends a positive signal to the market regarding the quality of the issuing firm and therefore reduces the information asymmetry between the insider and outsider of the firm. The mitigated information asymmetry among market participants results in a higher offering price and a decrease in the IPO underpricing. With respect to the certification role of VCs, precedent research provides mixed results. One of the shortcomings of previous studies investigating the role of VCs in Korea is that their sample periods- mostly before 2010- include frequent changes in regulations such as market making and put-back option regulations that can affect the extent of IPO underpricing. These regulations tend to worsen the IPO underpricing phenomenon. Using the sample period between 2011 to 2015, when the market making and put-back option regulations did not operate, this paper can avoid the bias stemming from the regulation change. Our empirical results show that market-adjusted initial returns for VC backed IPO stocks are not lower than those for non-VC backed IPO stocks. We also find that cumulative abnormal returns for the 90-day period after IPO have upward trend for non-VC backed firms while, for VC-vacked firms, they decrease for the first fifteen days and could not recover to the level of initial day returns. These findings reveal that the financial and managerial support of venture capital in the issuing firms does not serve the certification role in Korea, implying that Korea's venture capital market does not function with the same level of developed countries. This study suggests that in order to settle down the proper venture system―investment, exit, re-investment of venture capital―the external growth of venture capital investment should be accompanied by the positive role of venture capital in the IPO market.