우주항공의 신소재를 위한 New Austria Tunnel Method 수지합성에 대한 Fume silica의 영향

김기준,이주호,박태술,이주엽,Kim, Kijun,Lee, Jooho,Park, Taesul,Lee, Joo-Youb 한국응용과학기술학회 2014 한국응용과학기술학회지 Vol.31 No.4

NATM의 미세 구조는 SEM, FT-IR, 인장특성, 그리고 [NCO]/[OH]의 mole %, 입도분석에 의해 측정하였다. 친환경적인 NATM에 관한 관심이 고조됨에 따라 스테인레스 등의 금속코팅에 더욱더 중요한 무용제 도료의 발전을 이끈다. 우리는 스테인레스 스틸의 부식을 방지할 수 있는 NATM(New Austria Tunnel Method)의 수지를 합성하였다. 폴리우레탄과 에폭시로 합성한 혼성 수지는 일반적 NATM 수지와 도료와 비교하여 강도와 내구력이 매우 양호하다. 혼성수지는 폴리올, 에폭시, MDI, 실리콘 계면활성제, 촉매, 가교제, 충전제로 구성된다. 충전제인 fume silica는 경화속도를 가속시킬 뿐만 아니라 열적 장벽으로 물성이 우수함을 나타냈다. NATM 수지의 기계적 특성은 [NCO]/[OH]의 mole%와 fume silica가 증가함에 따라 강도가 증가하였다. 결론적으로 가교제와 fume silica가 함유된 혼성수지의 미세구조는 스테인레스 스틸같은 금속물질의 열경화코팅을 위한 좋은 물질이다. The microstructures of NATM were examined by SEM, FT-IR spectra, tensile properties, mole % of [NCO/OH], and particle size analyzer. Growing concerns in the environment-friendly industries have led to the development of solvent-free formulations that can be cured. We had synthesized NATM(New Austria Tunnel Method) resin having the ability to protect stainless steel against corrosion. Comparing with general NATM resin and coatings, this resin that synthesized with polyurethane and epoxy was highly stronger in intensity and longer durability. Hybrid resin was composed of polyols, MDI, epoxy, silicone surfactant, catalyst and crosslink agent, and fillers. Moreover, fillers such as fume silica not only accelerated the curing rate but also improved the physical property as thermal barriers. The rigid segments of synthetic resin in mechanical properties were due to fume silica and the increase the mole% of [NCO/OH] for corrosion protection. In conclusion, the hybrid resin microstructure with crosslink agent and fume silica are good material for thermosetting coating of metal substrates such as stainless steel.

지식산업센터의 가격결정요인에 관한 연구

김기준 ( Kim Kijun ),김형근 ( Kim Hyungkeun ),정택수 ( Jung Taeksoo ),신종칠 ( Shin Jongchil ) 한국부동산분석학회 2017 부동산분석학회 학술발표논문집 Vol.2017 No.-

As the knowledge industry center attracts the attention as the new real estate for business and investment, the development paradigm is changing in a direction of emphasizing the differentiated marketability. In addition, the differentiation of the architecture plan and each unit plan is considered as an important factor affecting the pricing in the situation that demander needs of the knowledge industry center are diversified. Accordingly, the pricing factors of the knowledge industry center were researched focusing on the architectural planning and each unit characteristics in this study. The analysis was exteriorized in an individual unit by setting each unit price of the knowledge industry center in Seoul which had been parceled out from 2004 to 2016 as the dependent variable. The hedonic price model was used as the analysis model and the validity of the model was verified through the residual analysis. As a result of analysis, the price difference of the knowledge industry center was significant according to each district of Seoul City. The variables influencing the accessibility and cognition of the knowledge industry center with regard to the locational characteristic had a significant influence on the price. Also, the variables of architectural planning related to the convenience of occupants mostly had a significant effect on the price. Eccentric core had a negative effect on the price, and both shopping district connection development and the green connection development had a positive effect on the price. The contracted area and location floor had a significant effect on the price, which is the reference when planning the plane by floor. The distance from the elevator was a significant factor affecting the pricing and it is confirmed through this that the importance of the user`s cognition and accessibility is also applied to each unit location.

모빌 IP의 인증 프로토콜과 익명성 지원을 위한 Rc5 알고리즘의 하드웨어 구현

김기준(KiJun Kim),채수환(SooHoan Chae),박종서(JongSou Park),염동복(DongBok Yeom) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅲ

모빌 IP는 이동 노드의 모든 메시지를 중계하는 외부 에이전트에 대한 인증 기능이 없으며 이동 노드의 익명성을 제공하지 않는다. 이로 인하여 도청과 같은 수동적 공격에 취약하며 또한 스무스 핸드오프를 위한 이동 노드와 외부 에이전트간의 등록 키 공유문제가 발생한다. 본 논문에서는 외부 에이전트와 홈 에이전트 간에 추가적인 부하를 최소화시킬 수 있는 형태의 인증 및 키 분배 프로토콜과 익명성 제공 방법을 제안하고 추가적인 시간소모를 최소화하기 위하여 암호화 알고리즘을 VHDL을 통하여 하드웨어로 설계하였다.

학군특성이 주택가격에 미치는 영향에 관한 연구

김기준(Kijun Kim),요요(Yao Yao),송선주(Seonju Song) 건국대학교 부동산도시연구원 2017 부동산 도시연구 Vol.9 No.2

중국 부동산시장의 고속 발전 이면에는 불합리한 시장구조, 불완전한 부동산 시장제도, 주택가격의 폭등 등 해결해야 할 난제들이 남아있다. 특히 중국의 학군주택제도와 같은 특수한 교육정책은 부동산시장과 불가분의 관계를 유지하고 있다. 본 연구는 이러한 배경을 바탕으로 중국 베이징의 핵심권역과 중심권역을 대상으로 학군주택의 가격 형성요인을 연구하였다. 이를 위해 헤도닉 가격 모형을 이용하여 베이징 주택가격을 결정하는 요인을 지역특성, 입지특성, 단지특성, 건물특성, 교육특성으로 구분하여 분석하였다. 분석결과로는 지역특성별로 주택가격에 대한 영향력이 유의미함을 확인하였고, 교육특성으로서 학교등급이 주택가격에 정(+)의 영향력을 가지는 것을 분석하였다. 또한 핵심권역 및 학교와 가까울수록 주택가격은 상승하였으며, 주거쾌적성을 나타내는 단지특성과 건물특성도 주택가격을 형성하는 요인으로 확인되었다. 상기와 같은 연구결과는 베이징 주택시장의 가격형성요인을 더욱 구체적으로 이해하는데 도움이 되며, 주택 및 교육정책을 추진하는데 활용될 수 있다. The rapid growth of the Chinese real estate market has a number of dilemmas, such as unreasonable market structure, incomplete real estate market system, and skyrocketing house prices. In particular, special educational policies, such as China s school district housing system, are inseparable from the real estate market. With this background, this study aims to look into pricing factors of school-district housing, focusing on core and central areas in Beijing, China. The hedonic pricing model was used in order to analyze factors that determine house prices in Beijing, in terms of region, location, complex, building, and education. As a result of the study, it was found that regional properties have significant influences on house prices, and also educational properties, particularly the status of schools, have a positive correlation with house prices. Besides, the result showed that houses which are located closer to core region and schools tend to have higher prices, and also complex and building properties are the important factors that determine house prices. The above result is expected to highly contribute to the in-depth understanding of the pricing factors in the Beijing s housing market and also to the development of more strategic housing and educational policies.

지식산업센터의 가격결정요인에 관한 연구

김기준 ( Kim Kijun ),김형근 ( Kim Hyungkeun ),정택수 ( Jung Taeksoo ),신종칠 ( Shin Jongchil ) 한국부동산분석학회 2017 不動産學硏究 Vol.23 No.3

In Korea, the knowledge industry centers attract the attention. In the knowledge industry center market, the development paradigm is changing toward emphasizing the product differentiation by making the best use of architectural planning and unit plan. The objective of this research is to explain influencing factors on the sales price of knowledge industry center focusing on the architectural planning and unit plan. We categorize influencing factors on sales price into regional, locational, architectural, unit, and time characteristics. For empirical research, we analyze the 6,726 sales prices of individual units in 28 knowledge industry centers sold from 2004 to 2016 by using hedonic price model. The main empirical results are as follows. Firstly, this study confirms the locational characteristics such as the distance to subway station, the distance to bus stop, and corner location, have significant effects on the sale price. These results display accessibility and visibility are also important to knowledge industry center. Secondly, this study finds the architectural characteristics such as the total leasable area of the center, core type, area for amenity facilities, mixed-use development with retail property or park, and the number of elevator per leasable area, have significant effects on the sale price. These results demonstrate architectural characteristics can be used as important differentiation factors for knowledge industry center development. Thirdly, this study shows the individual characteristics such leasable area of the individual unit, the floor that individual unit is located, the distance between the individual unit and elevator hall, and the number of balconies annexed to individual unit, have impacts on the sale price. These results represent unit plans of knowledge industry center, can affect sales prices. Fourthly, this study affirms the sales prices of knowledge industry centers are different according to regions and sales times.

오피스빌딩 내 상업시설의 임대료 결정요인에 관한 연구 -위계선형모형의 활용-

김기준 ( Kim Kijun ),김우경 ( Kim Wookyung ),문형준 ( Moon Hyoungjoon ),신종칠 ( Shin Jongchil ) 한국부동산분석학회 2018 不動産學硏究 Vol.24 No.3

The commercial facility is one of the important amenity facilities in office building. Recently, office building owners and managers are eager to enhance income stream from their commercial facilities by strengthening shopping and restaurant tenants. Since the retail potential commercial facilities in office buildings are influenced by the office building characteristics, trade area characteristics around office building, and so on, management strategies of commercial facilities could be different from office building to office building. Despite of these changes, there is little research on commercial facility in academic society. For these reasons, this study aims to examine the rent determinants of retail stores in commercial facilities. This study categorizes influencing factors into character of the office building, trade area, management, individual store. For empirical research, we analyze the rents of 393 retail stores at 38 commercial facilities of office buildings in Seoul. This study uses the hierarchical linear model to consider the effects of hierarchical influencing factors on rents including both office building level and individual store level. The results of the empirical analysis are as follows. Firstly, this study confirms office building characteristics including gross leasable area and building owner type, have considerable influence on store rents in the commercial facility. Secondly, this study finds trade area characteristics such as distance to subway station, road width, and pedestrian traffics around office building, have significant effects on store rents. Thirdly, this study discovers management characteristics such as the number of floors the commercial facilities occupy and management decision to operate commercial facility as an independent shopping mall, affect store rents in the commercial facility. Finally, this study shows the individual store characteristics such as store size, floor level that the store locates, whether the store has access to main pedestrian movement in the commercial facility, whether the store has signage outside of office building, and categories of tenant business, significantly influence on store rents.

공익연계마케팅의 적합성과 지속성이 브랜드 페이지 가입 및 추천의도에 미치는 영향

김기준(Kijun Kim),송해엽(Haeyeop Song),정재민(Jaemin Jung) 한국경영학회 2015 經營學硏究 Vol.44 No.1

하모닉 구조 확장과 NMF 기반의 인공 대역 확장 기술

김기준(Kijun Kim),박호종(Hochong Park) 대한전자공학회 2013 전자공학회논문지 Vol.50 No.12

본 논문에서는 주파수 영역에서 협대역 신호를 광대역으로 확장하는 새로운 인공 대역 확장 기술을 제안한다. 제안한 기술은 협대역 신호를 여기 신호와 스펙트럼 포락선 성분으로 분리하고, 주파수 영역에서 각각 독립적인 방법으로 확장한다. 여기 신호는 저대역의 하모닉 구조가 고대역에서 유지되도록 확장하고, 스펙트럼 포락선은 부대역별 에너지를 기반으로 NMF 방법으로 확장한다. 마지막으로 시간 축에서 프레임 사이의 상관관계를 기반으로 스펙트럼 위상을 결정하여 최종 광대역 신호를 생성한다. 주관적 청취 평가를 통하여 제안한 방법으로 대역 확장된 신호가 원 협대역 신호보다 음질이 향상된 것을 확인하였다. In this paper, we propose a new method for artificial bandwidth extension of narrow-band signal in frequency domain. In the proposed method, a narrow-band signal is decomposed into excitation signal and spectral envelope, which are extended independently in frequency domain. The excitation signal is extended such that low-band harmonic structure is maintained in high band, and the spectral envelope is extended based on sub-band energy using NMF. Finally, the spectral phase is determined based on signal correlation between frames in time domain, resulting in the final wide-band signal. The subjective evaluation verified that the wide-band signal generated by the proposed method has a higher quality than the original narrow-band signal.

NAND 플래시메모리 특성모델 기반 시뮬레이션 프레임워크

김기준(Kijun Kim),남이현(Eyee Hyun Nam),윤진혁(Jin Hyuk Yoon) 한국정보과학회 2012 한국정보과학회 학술발표논문집 Vol.39 No.2A

안드로이드 앱 로직 밤 탐지 기법

김민수(Minsu Kim),김기준(Kijun Kim),임형준(HyeongJun Yim),박민호(Minho Park) 한국정보과학회 2023 한국정보과학회 학술발표논문집 Vol.2023 No.6