IPv6 침입 탐지 및 차단 기술

김기영,정보흥,장종수,Kim Ki-Yeong,Jeong Bo-Heung,Jang Jeong-Su 한국통신학회 2006 정보와 통신 Vol.23 No.9

TDR센서를 이용한 제방의 함수비 해석

김기영(Ki-Yeong Kim),박민철(Min-Cheol Park),이재호(Jae-Ho Lee),한희수(Heui-Soo Han) 한국지반환경공학회 2010 한국지반환경공학회 학술발표회논문집 Vol.2010 No.9

전기자동차용 난방시스템의 성능 및 효율 향상에 관한 연구

김기영(Ki Yeong Kim),김성철(Sung Chul Kim),김민수(Min Soo Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5

In this study, a combined system of heat pump and PTC heater was developed for air conditioning unit in electric vehicles. The system consists of a compressor, a condenser, an evaporator, an expansion device and a PTC heater. Experiments were carried out to examine the steady state characteristics of this system. Compressor speed, outdoor air inlet temperature, indoor air inlet temperature are varied and the performance of the system was experimentally investigated. The heating capacity, compressor power consumption and COP were obtained. For the heat pump system, PTC heater and combined system, the heating performance and efficiency were investigated to find optimal control method. The results of this study show good agreement with the experimental results available in the literature. Therefore this study provides experimental data of good quality for forthcoming studies on heating system design and development for electric vehicles.

패밀리 레스토랑의 브랜드 심벌이 브랜드 이미지, 선호도 및 구매의도에 미치는 영향

김기영(Ki Yeong Kim),최동희(Dong Hee Choi),이용호(Yong Ho Lee) 한국조리학회 2011 한국조리학회지 Vol.17 No.3

This study is concerned with the effect of a brand symbol of a family restaurant on brand image, preference, and purchasing intention. With regard to analysis methods, the study carried out a reliability test and a validity test concerning a precedent research concept, ahead of verifying the hypothesis by using the SPSS Ver. 16.0. Also, the study conducted a frequency analysis, technical analysis, exploratory factor analysis, and regression analysis for verifying the hypothesis. As a result of the research, regarding a brand symbol as a visual symbol, three factors including a functional factor, a value factor, and an aesthetic factor were extracted, and of them, the functional factor and an aesthetic factor were discovered to influence of the brand image and preference which affected purchasing intention. In addition, consumers preferred a logo type that includes a company name or a brand name rather than a picture or a mark type of a symbol regarding a brand symbol, and they answered that outdoor advertising would raise awareness more than TV advertising. Based on these results, using a logo type symbol and the mix of outdoor advertising and TV advertising should be considered for brand launch.

초동주시 역산을 통한 KCRT-2008 측선 하부의 지진파 속도구조

김기영 ( Ki Young Kim ),이정모 ( Jung Mo Lee ),박창업 ( Chang Eob Baag ),정희옥 ( Hee Ok Jung ),홍명호 ( Myung Ho Hong ),김준영 ( Jun Yeong Kim ) 한국지구물리탐사학회 2010 지구물리와 물리탐사 Vol.13 No.2

춘천지역의 천부 횡파속도를 구하기 위한 레일리파 분산곡선 역산

김기영 ( Ki Young Kim ),김우중 ( Woo Jung Kim ),박영환 ( Yeong Hwan Park ) 한국지구물리·물리탐사학회 2012 지구물리와 물리탐사 Vol.15 No.1

천부 횡파속도(Vs)를 구하기 위한 효율적 방법을 모색하기 위하여, 수동적 및 능동적 방법으로 발생된 레일리파의 분산곡선 특성을 분석하였다. 춘천지역에서 반경 5, 4O m인 4개 삼각형 배열을 이용하여 5분간 감지한 상시미동을 확장된 공간자기상관법으로 분석하였다. 동일한 지역에서 해머로 발생시키고 4.5 Hz 지오폰 24개로 2초간 기록한 인공적 레일리파는 다중채널 표면파 분석법으로 처리하였다. 7~l9 Hz와 50 Hz 구간에서 상대적으로 높은 신호/잡음비를 보이는 상시미동과 인공적 레일리파의 분산곡선을 병합하고 역산한 결괴를 시추공 주상도와 비교하였다. 토사층 및 연암층의 vs는 각각 221 m/s와 846 m/s 정도로 비교적 일정하나, 사력-혼전층 및 풍화암층 구간에서는 깊이에 따라 선형으로 증가하는 양상을 보인다. 횡파속도에 의한 지반분류를 적용할 경우, 풍화암/연암의 경계는 시추주상도에 표시퇸 깊이 보다 5m 깊은 것으로 분석된다. To evaluate methods of determining near-surface shear-wave velocities (Vs), we derived dispersion curves of Rayleigh waves generated by both passive and active sources in Chuncheon, Korea. Microtremors were recorded for S minutes in each of four triangular arrays with radii of 5 -40 m. Those data were analyzed using the Spatial Autocorrelation method. Rayleigh waves were also generated by a hammer source and recorded in the same area for 2 s using 24 4.5-Hz geophones. Multichannel Analysis of Surface Waves was applied to those data, Velocity spectra were derived with relatively high signal-to-noise ratios in the frequency ranges of 7- 19 and 11 -50 Hz for the microtremors and synthetically generated Rayleigh waves, respectively. The resultant dispersion curves were combined as one and then input to inversion to derive shear wave velocities that were compared with a lithology log from a nearby well. Shear-wave velocities in the top soil and soft-rock layers are almost constant with values of 221 and 846 m/s, respectively; while the inverse-modeled Vs increases linearly in the gravelly sand, cobbles, and weathered-rock layers. If rock type is classified based on shear-wave velocity, the inversion-derived boundary between weathered-rock and soft rock may be about 5 m deeper than in the well log.

TDR센서를 이용한 제방의 포화도 해석

김기영(Kim Ki-Yeong),박민철(Park Min-Cheol),이재호(Lee Jae-Ho),한희수(Han Heui-Soo) 대한토목학회 2010 대한토목학회 학술대회 Vol.2010 No.10

학교의 전문적 학습공동체가 역량함양 교육활동에 미치는 영향 : 과정중심평가 연수의 조절효과를 중심으로

이세미(Lee, Se-mi),김기영(Kim, Ki-yeong),김해련(Kim, Hae-ryun),김영식(Kim, Yeong-sik),김이경(Kim, Ee-gyeong) 한국교원교육학회 2020 한국교원교육연구 Vol.37 No.4

본 연구는 학교의 전문적 학습공동체와 학교의 역량함양 교육활동 간의 영향관계 및 이 두 변수 간의 관계에 있어서 과정중심평가 연수가 갖는 조절효과를 분석하는 데 목적이 있다. 이를 위해 한국교육종단연구 2013의 5차년도(2017년) 학교 조사 결과 가운데 결측치를 제외한 1,045개 학교의 응답 자료를 토대로 기술통계, 상관관계분석, 단순 선형 회귀분석, 위계적 회귀분석을 실시하고, SPSS PROCESS macro 3.5를 이용하여 조절효과를 검증하였다. 연구 결과, 학교 구성원 모두가 학생의 학습에 초점을 맞춘 전문적 학습공동체의 일원으로 적극 협력할 경우 역량함양 교육활동은 더욱 활발해지는 영향관계가 있고, 교내에서 실시되는 과정중심평가 연수는 학교의 전문적 학습공동체가 역량함양 교육활동에 미치는 영향을 조절하는 효과가 있음을 확인하였다. 이러한 연구 결과를 바탕으로 2015 개정교육과정이 지향하는 역량함양 교육의 활성화를 이해하고 실천하는 데 필요한 학문적, 정책적 시사점을 도출하여 제시하였다. 특히, 교사 중심 협의의 전문적 학습공동체 개념이 교장, 교감, 교사, 교직원 모두를 포괄하는 넓은 의미의 전문적 학습공동체로 확장될 필요가 있으며, 교육 실천의 관점에서 학교 구성원의 인식 전환을 위한 학교경영 리더십과 전략, 연수기회 제공 등의 필요성을 강조하였다. This study seeks to analyze the relationship of influence of a professional learning community of school and a competency development activity in school, and the moderating effect of process-focused assessment teacher training between the two variables. Out of 「KELS 2013」, the 5th(2017) data set, the responses of 1,045 school data were analyzed excluding outliers. Descriptive statistics, correlation, simple regresssion, and hierarchical regression analysis were used to answer these questions, and SPSS Process Macro 3.5 was used to verify the moderating effect. According to the results, when all of the school members eagerly cooperated as a member of professional learning community of school focusing on students’ learning, competency development activities had more impact actively. It was confirmed that the moderating effect of process-focused assessment teacher training conducted in school adjusted the influence of professional learning community of school upon competency development activity. Based on the result, we suggested that the academic and policy implication were presented to understand and to practice vitalization of competency development in the pursuit of the 2015 revised curriculum. In particular, the concept of a professional learning community oriented to teachers needed to be extended to a professional learning community including principals, vice principals, teachers, and the teaching staff in a broad sense, and we emphasized the necessity of school management leadership, strategy, and teacher training to change the perception of school members in the perspective of practice in education.

청천댐 주변의 천부 P파 및 S파 속도구조

박영환 ( Yeong Hwan Park ),김기영 ( Ki Young Kim ) 한국지구물리·물리탐사학회 2013 지구물리와 물리탐사 Vol.16 No.3

높이 23 m인 보령시 청천댐 상부와 인근에서 5 kg 해머를 이용하여 소규모 굴절법 및 표면파 탐사를 실시하였다. 인공 지진파의 수직 및 수평성분을 초동주시 토모그래피 및 레일리파 분산곡선 역산을 통하여 천부 P파속도(vp)와 S파속도(vs) 구조를 파악하였다. 중생대 퇴적암질 기반암의 평균 vp와 vs는 댐마루 30 m 깊이에서 각각 1650 m/s와 950m/s, 하류쪽 댐체 끝 지점 10 m 깊이에서 각각 1650 m/s와 940 m/s로 분석된다. 이 층들의 동포아송비는 0.24~0.25의범위로, 고화된 퇴적층의 값과 일치한다. 댐체로부터 152 m 하류지점의 깊이 45 m 시추공 부근에서의 SH파 굴절법 토모그램은 10~12 m 깊이에 평균 vs가 870 m/s인 임계굴절면이 존재함을 보여준다. 이 지역에서는 덮개층의 vp와 vs가각각 500 m/s와 200 m/s인 상부층과 깊이에 따라 속도가 거의 선형으로 증가하는 하부층으로 구성되어 있다. On and near the 23-m high earthen Cheongcheon dam in Boryeong City, Korea, short seismic refraction and surface-wave profiles were conducted using a 5-kg sledgehammer. From vertical and horizontal components of the seismic waves, near-surface P-wave velocities (vp) and S-wave velocities (vs) were derived by inverting first-arrival refraction times and dispersion curves of Rayleigh waves. Average vp and vs for the Jurassic sedimentary basement were determined to be 1650 and 950 m/s at a depth of 30 m directly beneath the dam and 1650 m/s and 940 m/s at a depth of 10 m at the toe of the dam, respectively. The dynamic Poisson`s ratio for these strata were therefore in the range of 0.24 to0.25, which is consistent with ratios for consolidated sedimentary strata. Near a 45-m borehole 152 m downstream from the dam crest, an SH tomogram indicates a refraction boundary with an average vs of 870 m/s at depths of 10~12 m.At this site, the overburden comprises the upper layer with relatively constant vp and vs around 500 and 200 m/s, respectively, and the lower layer in which both vp and vs increase with depth almost linearly. The dynamic Poisson`s ratios for the overburden were in the range of 0.30 to 0.43.

기능분석을 통한 인공위성의 신뢰도 예측

유기훈(Ki-Hoon Yoo),김기영(Gi-Young Kim),안영기(Yeong-Gi Ahn),차동원(Dong-Won Cha),신구환(Goo-Hwan Shin),김동국(Dong-Guk Kim),채장수(Jang-Soo Chae),장중순(Joong-Soon Jang) 한국신뢰성학회 2015 신뢰성응용연구 Vol.15 No.1

In this study, we propose reliability prediction of a satellite by function analysis. To do so, the intended functions of the satellite are derived from using function structure block diagram, and defined as main, sub, and detailed functions. Furthermore, in order to generate function and reliability structure table, reliability model rule, duty cycle, and types of switch are assigned to the classified functions. This study also establishes reliability block diagram and mathematical reliability models to schematize the relationship among the functions. The reliability of the classified function is estimated by calculating the failure rate of parts comprising them. Finally, we apply the proposed method to a small satellite as a case study. The result shows that the reliability for the detailed function and the sub function as well as the main function could be predicted quantitatively and accurately by the proposed approach.