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- 저자 : 황성욱(Sung-Wook Hwang) (검색결과 177 건)
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황성욱,손성무,정성욱,Hwang, Seong-Uk,Son, Sung-Moo,Chung, Sung-Wook 한국정보통신학회 2022 한국정보통신학회논문지 Vol.26 No.5
Most Bluetooth devices are commonly used in various ways these days, but they can be often lost due to small-size devices. However, most Bluetooth protocol do not provide authentication functions to legitimate owners, and thus someone who obtains the lost Bluetooth device can easily connect to their smart devices to use it. In this paper, we propose NBAS can authenticates legitimate owners using NFT on lossy Bluetooth devices.NBAS generates a digital wallet on the blockchain using the decentralized network Ethereum blockchain and facilitating the MAC address of the Bluetooth device in the digital wallet. The owner of the wallet uses a private key to certify the Bluetooth device using NFT. The initial pairing time of NBAS was 10.25 sec, but the reconnection time was 0.007 sec similar to the conventional method, and the pairing rejection time for unapproved users was 1.58 sec on average. Therefore, the proposed NBAS effectively shows the device authentication over the conventional Bluetooth.
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광대역 종합 통신망 응용을 위한 8b 52 MHz CMOS 서브레인징 A/D 변환기 설계
황성욱,이승훈,Hwang, Sung-Wook,Lee, Seung-Hoon 한국전기전자학회 1998 전기전자학회논문지 Vol.2 No.2
This paper describes an 8b 52 MHz CMOS subranging analog-to-digital converter (ADC) for Integrated Services Digital Network (ISDN) applications. The proposed ADC based on the improved time-interleaved architecture removes the holding time which is typically observed in the conventional double-channel subranging ADCs to increase throughput rate. Moreover, the ADC employs the interpolation technique in the back-end subranging ADCs far residue signal processing to minimize die area and power consumption. The fabricated and measured prototype ADC in a 0.8 um n-well double-poly double-metal CMOS process typically shows a 52 MHz sampling rate at a 5 V supply voltage with 230 mW, and a 40 MHz sampling rate at a 3 V power supply with 60 mW power consumption.
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황성욱,Hwang, Sung-Wook 대한심미치과학회 2014 Journal of the Korean Academy of Esthetic Dentistr Vol.23 No.2
In case of esthetic restorative procedure with zirconia restoration, we have to use resin cement because of not only just for retention but also esthetic reason. In such a clinical situation, we have to consider two bonding interfaces, one is tooth surface to resin cement and the other is zirconia surface to resin cement. There is well established bonding protocol between tooth surface to resin cement, but bonding protocol of zirconia surface to resin cement is still controversial. In scientific point of view, there are two mechanism for bonding of zirconia restoration.. One is mechanical retention and the other is chemical adhesion. However, we have three different options for bonding of zirconia restoration in clinical situation; 1) Tribo-chemical coating with silica and silane coupling agent 2) Zirconia primer with phosphate chemistry 3) Self-adhesive resin cement with phosphate chemistry.
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황성욱(Sung-Wook Hwang),박정우(Joung-Woo Park),서이수(Lee-Soo Seo) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
In this paper, natural convection of a magnetic fluids(W-40) in a half circular pipe enclosure are investigated by numerical and experimental method. One side wall is kept at a constant temperature(25℃), and the opposite side wall is also kept at a constant temperature(20℃). Under above conditions, various magnitudes of the magnetic fields were applied up. Theoretical study through the governing equation derived by Siliomis is carried out with numerical analysis by the GSMAC Method. And the thermo-sensitive liquid crystal film(R20C5A) is utilized in order to visualize wall-temperature distributions as an experimental method. This study has resulted in the following fact that the natural convection of a magnetic fluids are controlled by the direction and intensity of the magnetic fields.
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P2G 기반 마이크로그리드의 경제성 분석 및 보급 방안에 관한 연구
황성욱(Sung-Wook Hwang),이학주(Hak-Ju Lee),김정훈(Jung-Hoon Kim) 대한전기학회 2021 전기학회논문지 Vol.70 No.2
Recently, global interest in the hydrogen economy is increasing, and most advanced countries, as well as Korea, have established and implemented various policies to foster the hydrogen industry. Hydrogen is considered as an energy carrier that is able to integrate and control existing energy such as electricity, gas, and heat in one dimension, and theoretically, its possibility has already been confirmed. As the first step to implement this, advanced countries such as Switzerland and Germany are leading the development of Powr-to-Gas (P2G) technology. In Korea, some energy-related organizations are conducting various researches recently, and KEPCO (Korea Electric Power Corporation) began research to connect the P2G-based microgrid to the distribution grid in 2019. Currently, the design and construction of the demonstration site is in progress. In this paper, the economic feasibility of a P2G-based microgrid is analyzed and an appropriate direction of penetration is proposed considering the increase of hydrogen load. For the economic analysis, HOMER Pro, which is widely used worldwide for evaluating the economics of renewable energy and microgrids, is used and Bass" diffusion model is applied to predict the increase of hydrogen load. In the case study, the economic analysis is carried out to derive the optimal facility configuration for 10% of the total load of the Ulsan techno-industrial complex under construction of the P2G-based microgrid demonstration site. As well as the sensitivity according to the level of hydrogen load is evaluated for the purpose of utilization of unused energy caused by renewable energy.
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A Functional Analysis of the 2007 South Korean Presidential Campaign Blogs
Sung Wook Hwang(황성욱),William L. Benoit(윌리엄 베노이트) 사이버커뮤니케이션학회 2009 사이버 커뮤니케이션 학보 Vol.26 No.1
본 연구는 2007년 한국 대통령선거 캠페인 기간 중 대통합 민주신당과 한나라당의 두 후보 블로그 담론의 기능과 주제를 내용분석하였다. 주요 결과는 다음과 같다. 후보들의 담론 기능의 빈도는 주장, 공격, 방어의 순으로 관찰되었다. 후보들은 인물보다 정책에 대해 더 자주 토론하였다. 과거 행동을 언급할 때 여당 정동영 후보는 후광효과를 의식한 듯 도전자 이명박 후보보다 주장의 담론을 더 많이 보여주었고, 공격의 담론을 덜 사용하였다. 후보들은 또한 공통적으로 일반목표 그리고 이상의 주제를 다룰 때 대체로 긍정적인 주장의 전략을 선택하였다. 이러한 발견들은 베노이트의 기능이론을 적용한 많은 기존의 기능이론 연구들에서 관찰된 바 있다. 그 일치성을 바탕으로 저자들은 한국 대선기간 동안의 새로운 뉴미디어 정치 캠페인 공간인 블로그 커뮤니케이션으로의 기능이론의 확장이라는 함의를 제공한다. 가설을 지지하는 발견들 그리고 일부 예외적인 결과들을 중심으로 더욱 구체적인 이론적, 실용적 암시점들이 토론되었다. This study examined the functions and topics on the 2007 South Korean presidential campaign blogs. The main findings were as follows: the candidates discussed acclaims most often, followed by attacks and defenses (H1); the candidates discussed more policy than character (H2); the incumbent party candidate Jung Dong Young acclaimed more and attacked less than the challenger Lee Myung Bak in the discussion of past deeds (H3); the candidates used more acclaims than attacks for general goals (H4) and ideals (H5). The results indicated the theoretical extension to the new online political campaign tool during the South Korean presidential campaign. Regarding the supportive findings and some exceptional findings, more specific theoretical and practical implications were discussed.
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경제성 분석을 통한 단독형 전기에너지주택의 LED조명 설계
황성욱(Sung-Wook Hwang),이현주(Hyun-Ju Lee),나환선(Hwan-Seon Nah),김정훈(Jung-Hoon Kim) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
Various concepts of law energy houses have been developed and constructed by official and unofficial parties. This paper focused all-electrified houses which is integrated with various areas such as electricity, machinery, architecture, material, and etc. Fossil fuel energy is used for heating and hot water supply in the conventional houses but electricity is adopted in the new conceptual houses. These houses include various high efficient appliances such as LED lightings and this paper shows economic effects of LED lightings, which effects are evaluated using the California Standard Practice Test that has been used to estimate the effects of existing DSM programs.
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