• 대한수학회보
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• 제37권3호
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• pp.601-618
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• 2000

Let (and $g^*$) be the space of regular test (and generalized, resp.) white noise functions. The integral kernel operators acting on and transformation groups of operators on are studied, and then every integral kernel operator acting on can be extended to continuous linear operator on $g^*$. The existence and uniqueness of solutions of Cauchy problems associated with certain integral kernel operators with intial data in $g^*$ are investigated.

• 한국전자파학회논문지
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• 제24권8호
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• pp.763-771
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• 2013

본 논문은 건물 내 환경에서 기존의 ISM(Industrial Scientific and Medical) 대역과 TVWS(TV White Space) 대역의 전파 특성을 이론 및 실험을 통하여 비교 분석하고, TVWS의 우수한 전파 특성을 확인한다. 이를 위하여 빌딩 전파 환경에서 503 MHz와 2.4 GHz의 중심 주파수를 갖는 전파 신호를 발생시켜 위치에 따른 수신 전력 강도를 측정하고, 측정한 경로 손실을 확인한다. 여기서 이론적 경로 손실을 계산하기 위하여 Hata, Extended Hata, Extended Hata(SRD), ITU-R P.1238 모델을 이용하였고, 측정한 경로 손실 값과의 비교 분석을 통하여 실내 환경에서 채널 모델의 신뢰성 정도를 분석한다.

• ETRI Journal
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• 제30권6호
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• pp.871-873
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• 2008

In this letter, we investigate the spectral efficiency of IEEE 802.22 wireless regional area network (WRAN) spectrum overlay when it is used in TV white space. Since 2004, when the FCC published the notice of proposed rule making 04-186 to make use of unused TV spectrum, the IEEE 802.22 working group has been standardizing specifications for WRAN operations. There have been a few papers investigating the spectral efficiency of this, but their analyses were limited to the cases for various guard distances between WRAN base stations. Since WRAN base station (BS) power for WRAN service may differ from country to country, it is important to analyze the spectral efficiency for various WRAN BS powers. In this letter, we analyze the spectral efficiency of WRAN spectrum overlay as a function of the power of WRAN BSs. The simulation results show that spectral efficiency decreases as the power of WRAN BSs and guard distances increase.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2009년 춘계학술발표대회 논문집
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• pp.300-303
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• 2009

The purpose of this study is to grasp the preference of colors in housing spaces by different type of personality and color preference by classifying dwellers various characteristics by MBTI to obtain basic informations for the color plan that satisfies their inner desire. The results of this study are as followed. Firstly, we could say about the color distribution of living spaces like that. The ceiling and general wall showed that N(white) systems and YR of bright tone was mostly distributed. The color of floor showed that the calm tone of YR was mostly distributed. Secondly, as for the favored colors of finishing material at each space, the biggest distribution of preference color was found as N(white) group(series) in case of ceilings. As for general walls, bright tone of N(white) group showed most in living rooms. In case of that of the floor, it showed the largest distribution of calm tone of YR. Point wall was preferred bright and brilliant in various kinds of color. Thirdly, as in favor of colors of closing materials, sensible types(S) are concentrated on common color groups, on the other hand, intuition types(N) prefer color groups of various kinds not only general preferred colors.

• ETRI Journal
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• 제37권6호
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• pp.1077-1086
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• 2015

This paper presents a general-purpose design scheme of a filter bank (FB)-based radio frequency (RF) transceiver that operates across the entire ultra-high frequency (UHF) TV band from 470 MHz to 698 MHz and complies with the TV white space (TVWS) regulatory requirements. To this end, an intermediate frequency (IF) band-pass filter (BPF) with a sharp skirt characteristic is considered as a solution for handling the incoming signals from a baseband modem. Specifically, an FB-based BPF structure with four ceramic resonator filters that effectively rejects unwanted signals is proposed to extract a desired signal in the TV band. Achievable data rates of a cognitive radio system (CRS) employing the proposed FB-based RF transceiver at the application layer are investigated in both wired and wireless environments. The service coverage of the CRS network is measured according to several modulation and coding schemes (MCSs) of the CRS. The results show that the coverage of a wireless network in a nearly open area can be extended by more than 9.3 km in the TVWS. Experimental results also confirm that the proposed FB-based RF transceiver is adequate for utilization in TVWS applications.

• ETRI Journal
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• 제38권1호
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• pp.112-122
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• 2016

This paper presents a set of candidate regulatory requirements for TV band devices (TVBDs) in the Rep. of Korea. To guarantee the protection of incumbent services, especially digital TV (DTV) and wireless microphones, in TV frequency bands, we suggest minimum separation distances of TVBDs from the noise-limited contour according to incumbent users and TVBD types. This paper also deals with multiple sets of separation distances of a co-channel TVBD network from a DTV protected contour on the basis of the radio propagation characteristics of different geographic areas to make good use of TV white space (TVWS) and safely protect the DTV service. We present a low-power transmission mode of TVBDs and the relevant separation distances for small-cell deployment. The service coverage reduction ratio of a TVBD network is investigated in the presence of DTV interference in four geographic areas. The TVWS field verification results, conducted on the island of Jeju (Rep. of Korea), show that incumbent services operate well without harmful interference from neighboring TVBDs with the proposed separation distances.

• 대한수학회보
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• 제21권1호
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• pp.1-5
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• 1984

The notion of linear 2-normed spaces was introduced by S. Gahler ([8,9,10,11]), and these space have been extensively studied by C. Diminnie, R. Ehret, S. Gahler, K. Iseki, A. White, Jr, and others. For nonzero vectors x,y in X, let V(x,y) denote the subspace of X generated by x and y. A linear 2-normed space (X,v) is said to be strictly convex ([3]) if v(x+y,z)=v(x,z)+v(y+z) and z not.mem.V(x,y) imply that y=ax for some a>0. Some characterizations of strict convexity for linear 2-normed spaces are given in [1,3,4,5,12]. Also, a linear 2-normed space (X,v) is said to be strictly 2-convex ([6]) if v(x,y)=v(x,z)=v(y,z)=1/3v(x+z, y+z)=1 implies that z=x+y. These space have been studied in [2,4,6,13]. It is easy to see that every strictly convex linear 2-normed space is always strictly 2-convex but the converse is not necessarily true. Throughout this paper, let (X,v) denote a linear 2-normed space.

• 만화애니메이션 연구
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• 통권40호
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• pp.177-209
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• 2015

만화에서 공간의 역할은 곧 영화에서 시간의 역할과 비교된다. 그렇기에 만화의 서사성은 공간과 불가분의 관계에 놓여 있고, 공간 구성이 중요성을 띠게 된다. 만화의 공간은 여러 개의 칸과 칸새가 인접, 병렬되어 다수의 프레임으로 구성되어 있는데, 디지털 만화에서는 칸과 칸 사이의 결집력이 상대적으로 약해지고 칸이 독립적인 프레임을 이루는 경향이 크지만, 페이지 만화에서는 여전히 칸이 모여 이뤄내는 장의 개념이 강조된다. 시각 매체에서 공간의 기본 틀을 구성하는 우선된 요소는 어두움과 밝음 즉 명암으로, 이는 만화 뿐 아니라 다른 시각 매체에도 고려해야 할 주요 조형 요소 가운데 하나이다. 만화에서도 이미지 구성을 위해 명암의 중요성이 강조되는데, 타매체와는 다르게 극단의 흑색과 백색의 사용이 두드러지는 것이 특이할 점이다. 매체적 측면으로는 판화를 배급 기반으로 했던 만화의 태생적 환경과, 형식적 측면으로는 만화 언어의 가독성을 바탕으로 자연스레 흑백의 이미지 사용이 이끌어졌다. 흑백 만화는 인쇄술의 발전과 컬러 만화의 등장으로 완전히 사라진 것이 아니라 여전히 창작되고 읽혀지는데, 이는 컬러 만화에서 표현하기 어려운, 흑백 만화만이 갖는 의미와 효과가 있다는 것을 뒷받침 한다. 만화의 흑백 표현은 색상에 대한 정보의 누락이라 저평가되지 않고 오히려 높은 가독성, 형식 언어의 강조와 이미지의 모던함을 불러온다. '만화에 있어 흑과 백은 실체적인 색이 아니라 상징적 의미를 포괄하는 복합적 요소'이며 형상의 '존재와 부재'를 드러내는 개념으로서 기능하고 있기 때문이다. 이 연구는 만화의 환경이 디지털화되면서 자칫 간과할 수 있는 흑백의 표현이 가져다주는 의미와 기능, 역할을 재조명하는 데에 그 목적을 두려한다. 흑백의 다양한 이미지와 형상을 통해 만화의 형식적 공간이 어떻게 구성되고 채워지며 서사전달이 구체화 되는가를 실제의 작품을 예시로 분석하고 파악한다.

• 한국자동차공학회논문집
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• 제11권3호
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• pp.155-160
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• 2003

For the weight reduction of vehicle body up to 20∼30% compared to the conventional monocoque steel body·.in-white, most automotive manufacturers have attempted to develop the aluminum intensive body-in-white using an aluminum space frame. In this paper, the crush tests and simulations for the aluminum extrusions filled with the structural from are performed to evaluate the collapse characteristics of that light weighted material. From these studies. the effectiveness of structural for is evaluated in improving automotive crashworthiness. In order to improve the improve energy absorption capability of the aluminum space frame body, safety design modifications are performed and analyzed based on the suggested collapse initiator concepts and on the application of the aluminum extrusions filled with structural foam. The effectiveness of these design concepts on the frontal and side impact characteristics of the aluminum intensive vehicle structure is investigated and summarized.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2008년도 춘계학술대회 논문집
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• pp.3-6
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• 2008

The purpose of this study is to investigate the luminous environment of fluorescent lamp and LED lamp in a office space for various color temperature by subject response test. For this, three different color temperatures were tested for the same illuminance level. Based on such test results for various color temperatures of fluorescent lamp and white LEDs, this study is to analyze the preferences of color temperature and light source, and perceptional brightness of each light source and color temperature. Then, this study is to derive the guidelines for the performance of color temperature which are suitable on the purpose and the mood of a office space.