• Journal of Korean Society of Forest Science
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• v.5 no.1
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• pp.27-32
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• 1966

Taking an opportunity of the application of clearcutting method, 140 red pine (Pinus densiflora Sieb. et Zucc.) trees grown at Chon-nam province, the southern part of South Korea, were fellen and the tree height, clear-bole length, D.B.H. diameter at base(0.2m above from the ground line) and the length of the longest branch were measured. The correlation between factors mentioned were analysed. The results are summarized as follows: 1. The correlation between crown length and tree height (r=0.821) was sinificant. 2. The correlation between the diameter at base and D.B.H. was highly significant (r=0.961). D.B.H. can be calculated from multiplying the diameter at base by 0.88. 3. A weak relation between D.B.H and tree height was abserved. 4. The positive correlation between tree height and clear-bole-length was calculated, but it was not sharp between D.B.H. and the length of the longest branch. 5. The height, basal area, D.B.H. and volume increment by tree class calculated from the data of the stem analysis are presented (Tab. 3~10).

• Journal of the Institute of Convergence Signal Processing
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• v.15 no.1
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• pp.9-14
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• 2014

The path loss data was re-calculated according to the distance between the base station and a mobile station in the mobile telecommunications network. In this paper, the averaged path loss data was plotted with the conventional path loss models(free space, plane earth, Hata model ${\ldots}$). The standard deviations for the 2 Km, 1 Km, 0.5 Km-interval averaged path loss were 2.29 dB, 3.39 dB, 4.75 dB, respectively. Additionally, the derivative values for the 2 Km, 1 Km, 0.5 Km-interval averaged path loss were evaluated to find the positions with more than 1 times or 2times of the standard deviation. The situations with the sharply fluctuated path loss were calculated to 5 positions in the 2 Km interval, to 7 positions in the 1 Km interval, to 19 positions in the 0.5 Km interval, respectively. And, the exact distances between the base station and a mobile station were found with the sharply fluctuated path loss.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.22 no.5
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• pp.545-551
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• 2011

In this paper, we described a measurement method of an EIRP(Effective Isotropic Radiated Power) of a WCDMA base station using a pilot channel in line-of-sight environments. Especially we measured it in real base station environments in order to apply this method to domestic base station inspection test. Estimated EIRP results from measured value is -2 dB lower than theoretical values, which is calculated by the data of transmit antenna. The deviation of -2 dB is verified as a polarization mismatch between the base station antenna and a receiver antenna, and it can be calibrated. Therefore, we verified that our measurement method could be an effective tool to measure an EIRP in WCDMA base station inspection test.

• Journal of Information Processing Systems
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• v.7 no.2
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• pp.271-286
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• 2011

In this paper, we propose efficient algorithms for parallel prefix computation and sorting on a recursive dual-net. The recursive dual-net $RDN^k$(B) for k > 0 has $(2n_o)^{2K}/2$ nodes and $d_0$ + k links per node, where $n_0$ and $d_0$ are the number of nod es and the node-degree of the base-network B, respectively. Assume that each node holds one data item, the communication and computation time complexities of the algorithm for parallel prefix computation on $RDN^k$(B), k > 0, are $2^{k+1}-2+2^kT_{comm}(0)$ and $2^{k+1}-2+2^kT_{comp}(0)$, respectively, where $T_{comm}(0)$ and $T_{comp}(0)$ are the communication and computation time complexities of the algorithm for parallel prefix computation on the base-network B, respectively. The algorithm for parallel sorting on $RDN^k$(B) is restricted on B = $Q_m$ where $Q_m$ is an m-cube. Assume that each node holds a single data item, the sorting algorithm runs in $O((m2^k)^2)$ computation steps and $O((km2^k)^2)$ communication steps, respectively.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2016.05a
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• pp.194-195
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• 2016

IMO에서 규정하는 모든 교육 및 훈련을 이수한 전문 해기인력이 매년 배출되고 있지만, 해양사고의 발생은 끊이지 않고 있다. 이는 해양사고를 대처하는 해기사의 위험상황 대처 능력이 크게 개선되지 않았다는 점을 의미한다. 공통적으로 해기사에게 제공되는 교육 및 훈련뿐만 아니라 해기사 개개인의 위험요소를 파악하여 해당 위험 요소에 대한 매뉴얼을 제공할 수 있는 모델이 개발되면 해양사고를 대처할 수 있다. 이러한 모델을 개발하기 위하여 모델 구축에 필요한 데이터베이스(Data Base, D/B)가 필요하다. 이러한 D/B는 모델에 활용할 수 있도록 숫자로 표기된 것이어야 한다. 본 연구에서는 해양안전심판원에서 제공하는 해양사고 데이터를 수집, 분석하여 해양사고 예방을 위한 모델에 활용할 수 있는 해양사고 수량화 D/B를 구축하는 방법에 대하여 고찰하였다. 1차적으로 해양사고 수량화 D/B를 구축하였으나, 이의 유용성이나 목적에 적합한 D/B의 규모 등에 관한 연구는 추후에 계속 되어야 한다.

• Proceedings of the KIEE Conference
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• 1987.07b
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• pp.1069-1072
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• 1987

In this paper, we drive useful data from 3-D depth information as input using discontinuity boundary or clustering. And using magnitude and direction of z-gradient we classify the data into adaptable primitive types through intrinsic and stochastical processing. After these processing information is reconstructed for forming data base. And make relationship and standard view position for matching.

• Journal of the Korean Society of Costume
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• v.50 no.3
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• pp.161-178
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• 2000

This study intended to provide the visual basic data of efficient fashion advertising for Missy Brands in the 21 th by investigating and analyzing the creative strategy related to expression of fashion advertisement. The Research methdologies were as follow. First, the change of domestic advertising industry, theoretical background of the creative strategy and the condition and problems in the domestic Missy market were studied through the relevant fashion advertisement and periodical publications. Second, the content analysis was done using the advertisement of Missy Brands in Fashion magazine, " ELLE" which were published from 1992 to 1998. (3/6/9/12). The results were summarized as follows: First, the ELLE's analysis results were to increase in number of the advertisements for the teenager Brand fro 1993 and for the I.B.(Imported Brand) or L.B(License Brand) from 1995. As a result of the analyses, we suppose that a number of advertisements are proportional related to the sales of Brands. Second, the re were significant differences between D.B. (Domestic Brand) and I.B(Imported Brand) or L.B.(License Brand ) in the change of creative strategy for Missy Brands advertisements. The creative strategy of D.B. ads was used more importantly in linsuistic message than in visual message. On the contrary, the creative strategy of I.B.(L.B) ads, attached importance to the visual message(photo). Third, the ads of TIME showed ads, effect to have relevance to sales. The creative strategy of TIME ads. appeals to consumer for consistent Brand image, at the same time reflects the distinctive Brand image from the other. This study was suggested the creative strategy change of TIME through the visual data base.data base.

• Journal of the Institute of Electronics and Information Engineers
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• v.52 no.10
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• pp.118-128
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• 2015

Compressive sensing (CS) has to face with two challenges of computational complexity reconstruction and low coding efficiency. As a solution, this paper presents a novel spatially scalable Kronecker two layer compressive sensing framework which facilitates reconstruction up to three spatial resolutions as well as much improved CS coding performance. We propose a dual-resolution sensing matrix based on the quincunx sampling grid which is applied to the base layer. This sensing matrix can provide a fast-preview of low resolution image at encoder side which is utilized for predictive coding. The enhancement layer is encoded as the residual measurement between the acquired measurement and predicted measurement data. The low resolution reconstruction is obtained from the base layer only while the high resolution image is jointly reconstructed using both two layers. Experimental results validate that the proposed scheme outperforms both conventional single layer and previous multi-resolution schemes especially at high bitrate like 2.0 bpp by 5.75dB and 5.05dB PSNR gain on average, respectively.

• Proceedings of the KAIS Fall Conference
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• 2010.11a
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• pp.305-308
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• 2010

본 연구에서는 사출 성형에서 Cavity내의 압력을 측정하여 사출 성형기에서의 설정한 변수 즉, 사출 압력에 따라 Cavity내의 압력이 사출 공정동안 어떠한 추이를 나타내는지 관찰하였다. 이를 CAE 해석과 비교 분석하여 결과에 따른 점도 함수와의 관계를 알아보았다. 우선 Cavity의 압력을 측정하기 위하여 Cavity 내에 압력센서를 설치하고, 이를 시간에 따른 압력측정 결과를 보기 위하여 압력센서 시스템을 제작 하였다. 실제 사출성형하면서 Cavity 내 압력을 측정하고 CAE 해석 결과의 압력 변화와 비교한다. 이때 일반적으로 CAE 해석과 실험결과가 일치하지 않으므로 새로운 점도 곡선을 추정하여 CAE 소프트웨어 D/B(Data Base) 파일에 입력하여 다시 해석하고 실험 결과와 비교하여 압력변화가 일치할 때까지 반복해서 수행한다. 이때 점도는 Power Law로 가정하여 D/B 파일에서 K와 n값을 조절할 수 있고 일반적으로 n값은 Base Resin과 동일하므로 K값의 변화만을 고려하여 압력변화를 해석한다.

• Bulletin of the Korean Chemical Society
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• v.27 no.11
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• pp.1737-1740
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• 2006

The optimized structures and complexation energies of bis(18-crown-6-ether) analogue (2) of Trgers base (1) with a series of primary alkylbisammonium ions have been calculated by DFT B3LYP/6-31G(d,p) method. The calculated complexation efficiency (-142.84 kcal/mol) of 2 for butane-1,4-diylbisammonium guest is better than twice of the value (-61.40 kcal/mol) for butylammonium ion. The multiple hydrogen-bond abilities for the complexes are described as the function of the length of the alkyl substituents of the bisammonium guests with normal-alkyl chain [$-(CH_2)_{n-}$, n = 4-8]. The longer bisammonium guest shows the stronger hydrogen-bonding characterizations (the distance and the quasi-linear angle of the N-H…O) to the host 2 than the shorter bisammonium ions. These calculated results agree with the experimental data of the complexation of 2 with bisammonium salts ([$NH_3(CH_2)_nNH_3$] $Cl_2$).