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김재호,김창기,김태정,전주일,유정주,홍진우,Kim, J.H.,Kim, C.K.,Kim, T.J.,Jeon, J.I.,Yoo, J.J.,Hong, J.W. 한국전자통신연구원 2012 전자통신동향분석 Vol.27 No.6
스마트TV와, 스마트폰, 스마트 패드뿐만 아니라 다양한 가전 또한 컴퓨팅 기능과 네트워크 기능을 가져 스마트 가전으로 진화할 것으로 예상된다. 또한, 사용자는 스마트TV를 중심으로 다양한 스마트 장치를 연결하여 방송과 통신, 웹, 홈 네트워크가 결합된 멀티스크린 서비스를 요구하고 있다. 본고에서는 스마트TV 기반 멀티스크린 서비스에 필요한 적응형 콘텐츠 부호화 기술과 콘텐츠 전송을 위해 다중 네트워크를 동시에 이용하는 하이브리드 네트워크 스트리밍 기술, 웹 또는 홈 네트워크 환경에서 콘텐츠 및 서비스의 발견 및 제어 기술에 대해서 살펴본다.
플라즈마 전해산화공정을 이용한 Mg<sub>95</sub>Zn<sub>4.3</sub>Y<sub>0.7</sub> 합금분말 성형체의 표면특성제어
김재호,최한신,김도향,황덕영,김형섭,김택수,Kim, J.H.,Choi, H.S.,Kim, D.H.,Hwang, D.Y.,Kim, H.S.,Kim, T.S. 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.2
The investigation is to modify the mechanical and chemical properties of Mg alloys using a combination of rapid solidification and surface treatment. As the first approach, $Mg_{95}Zn_{4.3}Y_{0.7}$ was gas atomized and pressure sintered by spark plasma sintering process (SPS), showing much finer microstructure and higher strength than the alloys as cast. Further modification was performed by treating the surface of PM Mg specimen using Plasma electrolytic oxidation (PEO) process. During the PEO processing, MgO layer was initiated to form on the surface of Mg powder compacts, and the thickness and the density of MgO layer were varied with the reaction time. The thickening rate became low with the reaction time due to the limited diffusion rate of Mg ions. The surface morphology, corrosion behavior and wear resistance were also discussed.
김재호,김장영,Kim, Jae-Ho,Kim, Jang-Young 한국정보통신학회 2021 한국정보통신학회논문지 Vol.25 No.7
국내 코로나19의 감염자 수가 백신과 사회적 거리 두기, 백신 등 여러 가지 노력 덕분에 차츰 줄어드는 듯 보였으나 2020년 2월 20일 특정한 사건 이후 감염자 수가 증가한 것처럼, 2020년 12월부터 또다시 급격히 감염자 수가 증가하는 추세이며 꾸준히 일일 500명가량의 감염자 수가 이어지고 있다. 따라서 Kaggle의 데이터셋을 이용해서 Prophet 알고리즘을 통해 미래 코로나19를 예측하고 사이킷런을 통해 결정계수, 평균 절대 오차, 평균 백분율 오차, 평균 제곱 차, 평균 제곱근 편차를 통해 이 예측에 대한 설명력을 더한다. 또한 코로나19가 급격히 특정한 사건이 없었을 경우 국내 감염자 수를 예측해 앞으로 우리가 미래의 질병에 대해서 방역과 방역 수칙 실천의 중요함을 강조한다. The number of people infected with Covid-19 in Korea seemed to be gradually decreasing thanks to various efforts such as social distancing and vaccines. However, just as the number of infected people increased after a particular incident on February 20, 2020, the number of infected people has been increasing rapidly since December 2020 by approximately 500 per day. Therefore, the future Covid-19 is predicted through the Prophet algorithm using Kaggle's dataset, and the explanatory power for this prediction is added through the coefficient of determination, mean absolute error, mean percent error, mean square difference, and mean square deviation through Scikit-learn. Moreover, in the absence of a specific incident rapidly increasing the cases of Covid-19, the proposed method predicts the number of infected people in Korea and emphasizes the importance of implementing epidemic prevention and quarantine rules for future diseases.
Global Mobile Ad Hoc Network에서 다중경로를 이용한 네트워크 성능향상에 관한 연구
김재호,배진승,정찬혁,이기원,문태수,하재승,유충렬,김현욱,이광배,Kim, Jae-Ho,Bae, Jin-Seung,Jung, Chan-Hyuk,Lee, Ki-Won,Moon, Tae-Soo,Ha, Jae-Seung,You, Choong-Yeul,Lee, Kwang-Bae,Kim, Hyun-Wook 한국전기전자학회 2008 전기전자학회논문지 Vol.12 No.1
유비쿼터스 환경의 출현에 따라 멀티 홉 통신이 탑재된 이동 단말기로 쉽게 유선 인터넷망에 접속하여 시스템을 제어하거나 정보를 공유하는 유.무선 통합망 연구가 활발히 진행 중이다. 현재 이동 Ad Hoc 네트워크와 유선망을 연결한 기존 유 무선 통합망에서는 게이트웨이를 이용한 이기종 네트워크 인터페이스 설정과 관련된 연구만 이루어지고 있는 실정이다. 제안한 알고리즘은 경로 상에서 에러 발생 시 데이터 손실을 막기 위해 송신단말기와 목적지 단말기사이에 독립적인 다중경로를 설정하였다. 그 결과, 경로 에러 시 지속적으로 데이터를 전송하게 함으로써 네트워크의 신뢰성을 향상시킬 수 있었다. With the advent of Ubiquitous environment, wired-wireless combination network is being studied very actively in which mobile nodes having multi-hop communication capability connect wired internet network easily, and shares the information. The study of wired and wireless combination network between MANET(Mobile Ad Hoc Network) and wired network is being focused only on the configuration of heterogeneous network interface. The proposed algorithm establishes independent multi-paths between source node and destination node to prevent data loss when errors happen in route. As the result, it shows that the reliability of the combination network can be improved by making data transmit continuously on the route error.
카본 나노재료 합성을 위한 표면파 플라즈마 CVD 기술
김재호,Kim, Jaeho 한국진공학회 2015 진공 이야기 Vol.2 No.4
Carbon nanomaterials including nanocrystalline diamond and graphene films are expected to play a core role in $21^{st}$ century industries due to their amazing physicochemical properties. To achieve their practical utilization and industrialization, the development of their mass production technologies is strongly required. Recently, a surface wave excited plasma (SWP) which is produced using microwaves has been attracting special attentions as a candidate for the mass production technology of carbon nanomaterials. SWP can allow a low-temperature large-area plasma chemical vapor deposition (CVD) system. Here, this article introduces the promising SWP-CVD technology. Plasma characteristics in a SWP will be introduced in detail to help understanding how to use and control a SWP as a plasma source for CVD applications.
초전도 전력기기의 계통적용을 위한 실시간 시뮬레이션 기법 개발 (PART 1 : 고온초전도 전력 케이블)
김재호,박민원,박대진,강진주,조전욱,심기덕,유인근,Kim, Jae-Ho,Park, Min-Won,Park, Dae-Jin,Kang, Jin-Ju,Cho, Jeon-Wook,Sim, Ki-Deok,Yu, In-Keun 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.11
High temperature superconducting(HTS) power cable is expected to be used for power transmission lines supplying electric power for densely populated cities in the near future. Since HTS power cable is capable of the high current density delivery with low power loss, the cable size can be compact comparing with the conventional cable whose capacity is same. In this paper, the authors propose the real time simulation method which puts a teal HTS wire into the simulated 22.9 kV utility grid system using Real Time Digital Simulator (RTDS). For the simulation analysis, test sample of HTS wire was actually manufactured. And the transient phenomenon of the HTS wire was analyzed in the simulated utility power grid. This simulation method is the world first trial in order to obtain much better data for installation of HTS power device into utility network.
김재호,장성록,문성배,하해동,양원재,이상우,Kim Jae-Ho,Chang Seong-Rok,Moon Serng-Bae,Ha Hae-Dong,Yang Won-Jae,Lee Sang-Woo 한국항해항만학회 2006 한국항해항만학회지 Vol.30 No.6
상선승무원들의 승선근무로 인한 질병 발생 실태를 조사하여 승선근무로 인해 발생되는 질병예방 및 건강증진을 위한 기초 자료를 제공하기 위한 목적으로 1049명의 상선승무원들을 대상으로 설문 및 면접을 통해 조사 분석한 결과는 다음과 같다. 최근 12개월 동안 승선 중 당직근무에 지장을 받을 정도의 질병을 경험한 선원은 69.0%였으며, 질병경험분포에 유의성을 나타낸 변수는 연령(p<0.05), 소득수준(p<0.01), 승선경력(p<0.01), 직급(p<0.01), 건강인식도(p<0.01), 건강염려도(p<0.01), 피로도(p<0.01), 직업만족도(p<0.05), 휴식시간(p<0.05) 등이었으며, 질병경험은 치주질환 7.3%>무좀 6.6%>위궤양 6.4%>외상 5.3% 순이었다. 질병군별 질병발생은 근골격계질환이 17.8%로 가장 많았고 구강계질환 13.6%> 피부계질환 12.4%> 소화계질환 12.1% 순이었으며, 발생 질병의 불편기간은 31일 이상이 35.7%, 입원기간과 치료기간은 각각 7일 이하가 50.2%, 42.8%였고 의료시설 이용은 의원급이 27.9%로 가장 높게 조사되었다. The purpose of this study was to find out morbidity rate and pattern of disease and affect of variables related disease and medical management of seafares'. The subjects this study were 1049 seafares' were took education in Korea Institute of Maritime and Fisheries Technology. This questionnaire was focused on finding the basic data for prevention of disease and promotion health for the seafares'. The collected data were analyzed by using descriptive statistics, Chi-square, cross tab, linear regression by SPSS 10.1 package. The result of this study are as follow. 1)The morbidity rate within recent 12 months was 69.0%. 2)there were significant differences qf occurred disease in age(p<0.05), income(p<0.01), career of ship on board(p<0.01), rank(p<.01), perceived health status(p<0.01), worry of health(p<0.01), fatigue symptoms(0.01), satisfy of job(p<0.05), rest time(p<0.05) 3) Considering disease unable to work more than 4 hour, the number of those who had oral disease 7.3%> tinea 6.6%> gastric ulcer 6.4, and musculoskeletal disease group were 20.9%, which revealed the highest rate oral disease 13.6%> skin disease> 12.4%, digestive disease> 12.1%. 4) As refer to medical management, The pain above 31days 35.7%, hospitalization and treatment below 7days were each 50.2%, 42.8%, medical service were doctor's office 27.9, which revealed the highest rate.