• 제목/요약/키워드: Index n

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A Cluster validity Index for Fuzzy Clustering

  • Lee, Haiyoung
    • 한국지능시스템학회논문지
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    • 제9권6호
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    • pp.621-626
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    • 1999
  • In this paper a new cluster validation index which is heuristic but able to eliminate the monotonically decreasing tendency occurring in which the number of cluster c gets very large and close to the number of data points n is proposed. We review the FCM algorithm and some conventional cluster validity criteria discuss on the limiting behavior of the proposed validity index and provide some numerical examples showing the effectiveness of the proposed cluster validity index.

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국립의료원 직원의 구강질환에 관한 연구

  • 이태원
    • 대한치과의사협회지
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    • 제12권11호
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    • pp.853-855
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    • 1974
  • The author had studied dental caries and periodontal disease in the 600 officers of National Medical Center. The results were as follows. 1. The dental caries experience rate in the officers of N.M.C was 87.0% and the D.M.F. teeth index was 5.0 2. The decayed teeth index was 2.55 and the missed teeth index was 0.39 and the filled teeth index was 2.27 3. The periodontal disease rate was 86.7%

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교란 및 불교란점토에 대한 새로운 압축지수식 (A New Compression Index Equations for Remolded and Undisturbed Clays)

  • 박종화;고우모또 타츠야
    • 한국농공학회:학술대회논문집
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    • 한국농공학회 2003년도 학술발표논문집
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    • pp.171-174
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    • 2003
  • The relationships between compression index, $C_c$, which is the slope of the e-log p curve from consolidation test, and other physical properties of remolded and undisturbed clays were examined. After examined, it is clarified that the $C_c$-initial porosity, $n_0$, relationship is better correlation than the $C_c$-other factors relationship, and a new $C_c$ equations using $n_0$ for remolded and undisturbed clays were suggested.

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형태안정성 PCM: 잠열저장을 위한 Polypropylene과 n-Eicosane으로 구성된 고화젤의 제조 및 특성 (Shape-Stabilized Phase Change Materials: Preparation and Properties of Frozen Gels from Polypropylene and n-Eicosane for Latent Heat Storage)

  • 손태원;임학상;김태훈;고재왕
    • 폴리머
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    • 제34권3호
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    • pp.261-268
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    • 2010
  • 본 연구에서는 상전이 온도가 36 $^{\circ}C$인 n-eicosnae을 열가소성 폴리올레핀 고분자인 폴리프로필렌과 블렌드하였으며, 또한 최근의 형태안정성 PCM(SSPCM)의 연구검토를 통하여 폴리프로필렌과 n-eicosnae의 특성과 잠열저장체로서의 적용 가능성을 확인하였다. 상전이 온도가 36 $^{\circ}C$인 n-eicosane과 폴리프로필렌을 멜팅방법과 흡수방법을 이용하여 시료를 제조하였다. 제조된 형태안정성 PCM(SSPCM)을 DSC, WAXD, FTIR spectroscopy, ARES로 분석결과 형태안정성, 열용량의 향상을 확인하였다.

Improving Lookup Time Complexity of Compressed Suffix Arrays using Multi-ary Wavelet Tree

  • Wu, Zheng;Na, Joong-Chae;Kim, Min-Hwan;Kim, Dong-Kyue
    • Journal of Computing Science and Engineering
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    • 제3권1호
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    • pp.1-4
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    • 2009
  • In a given text T of size n, we need to search for the information that we are interested. In order to support fast searching, an index must be constructed by preprocessing the text. Suffix array is a kind of index data structure. The compressed suffix array (CSA) is one of the compressed indices based on the regularity of the suffix array, and can be compressed to the $k^{th}$ order empirical entropy. In this paper we improve the lookup time complexity of the compressed suffix array by using the multi-ary wavelet tree at the cost of more space. In our implementation, the lookup time complexity of the compressed suffix array is O(${\log}_{\sigma}^{\varepsilon/(1-{\varepsilon})}\;n\;{\log}_r\;\sigma$), and the space of the compressed suffix array is ${\varepsilon}^{-1}\;nH_k(T)+O(n\;{\log}\;{\log}\;n/{\log}^{\varepsilon}_{\sigma}\;n)$ bits, where a is the size of alphabet, $H_k$ is the kth order empirical entropy r is the branching factor of the multi-ary wavelet tree such that $2{\leq}r{\leq}\sqrt{n}$ and $r{\leq}O({\log}^{1-{\varepsilon}}_{\sigma}\;n)$ and 0 < $\varepsilon$ < 1/2 is a constant.

N$_2$ Plasma Treatment Effects of Silicon Nitride Insulator Layer for Thin Film Transistor Applications

  • Ko, Jae-Kyung;Park, Yong-Seob;Park, Joong-Hyun;Kim, Do-Young;Yi, Jun-Sin;Chakrabarty, K.
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2002년도 International Meeting on Information Display
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    • pp.563-566
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    • 2002
  • We investigated to decrease the leakage current of SiNx film by employing $N_2$ plasma treatment. The insulator layers were prepared by two step process; the $N_2$ plasma treatment and then PECVD SiNx deposition with $SiH_4$, $N_2$ gases. To prove the influence of the $N_2$ plasma treatment, the Si substrate was exposed to the plasma, which was generated in Ne gas ambient. Without plasma treatment SiNx film grow at the rate of 7. 03 nm/min, has a refractive index n = 1.77 and hydrogen content of $2.16{\times}10^{22}cm^{-3}$ for $N_2/SiH_4$ gas flow ratio of 20. The obtained films were analyzed in terms of deposition rates, refractive index, hydrogen concentration, and electrical properties. By employing $N_2$ plasma treatment, interface traps such as mobile charges and injected charges were removed, hysteresis of capacitance-voltage (C-V) disappeared. We observed plasma treated sample were decreased the leakage current density reduces by 2 orders with respect to the sample having no plasma treatment.

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Polymerization and Physical Property Assessment of Optical Lens Materials Containing Amide Group

  • Lee, Min-Jae;Sung, A-Young
    • 대한화학회지
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    • 제62권2호
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    • pp.113-117
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    • 2018
  • The basic hydrogel lens with addition of N,N-dimethylacrylamide (DMA) and N-methyl-N-vinylacetamide (NMV) were manufactured. The optical and physical characteristics of ophthalmic lens were evaluated by measuring water content, oxygen permeability (Dk), refractive index and optical transmittance. The water content & oxygen permeability (Dk) of sample containing Ref., DMA group and NMV group was in the average of 34.48%, 35.54~49.19% & $13.003{\sim}18.468{\times}10^{-11}(cm^2/sec)$($mlO_2/ml{\times}mmHg$) and 36.28~44.95% & $12.270{\sim}16.883{\times}10^{-11}(cm^2/sec)$ ($mlO_2/ml{\times}mmHg$), respectively. And also, refractive index of the sample containing Ref., DMA group and NMV group was in the average of 1.4350, 1.4330~1.4131 and 1.4335~1.4195, respectively. Standard hydrogel monomer containing DMA and NMV was expected to be used usefully as a material for fabricating hydrophilic functional ophthalmic lens.

트리 기반의 상수 분지수 그래프 연구 (A Study on Tree-based fixed degree graph)

  • 장진혁;정승원;배경선;성보옥;이형옥
    • 한국정보처리학회:학술대회논문집
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    • 한국정보처리학회 2021년도 추계학술발표대회
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    • pp.23-25
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    • 2021
  • 포화 이진 트리를 기반으로 하는 상수 분지수 3의 새로운 그래프 TGn를 제안한다. TGn의 노드 주소는 n개의 비트로 나타내며, 노드 수는 2n개이고 지름은 2n-2다. 에지는 3가지로 분류할 수 있으며, 루트 노드와 연결된 에지, 중간 노드와 연결된 에지, 말단 노드와 연결된 에지가 있다. 트리를 기반으로 한 TGn의 깊이는 편의상 index N으로 나타낸다. index는 노드 주소를 S라 할 때, S가 0이면 0이고 1 이상이면 ⌊log2S+1⌋이다. 본 연구에서는 상수 분지수를 갖는 TGn을 정의하고, 라우팅 알고리즘과 지름을 분석한다.

Evaluation of the Amount of Nitrogen Top Dressing Based on Ground-based Remote Sensing for Leaf Perilla (Perilla frutescens) under the Polytunnel House

  • Kang, Seong-Soo;Sung, Jwa-Kyung;Gong, Hyo-Young;Jung, Hyung-Jin;Kim, Yoo-Hak;Hong, Soon-Dal
    • 한국토양비료학회지
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    • 제49권5호
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    • pp.598-607
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    • 2016
  • This study was conducted to evaluate the amount of nitrogen (N) top dressing based on the normalized difference vegetation indices (NDVI) by ground based sensors for leaf perilla under the polyethylene house. Experimental design was the randomized complete block design for five N fertilization levels and conventional fertilization with 3 and 4 replications in Gumsan-gun and Milyang-si field, respectively. Dry weight (DW), concentration of N, and amount of N uptake by leaf perilla as well as NDVIs from sensors were measured monthly. Difference of growth characteristics among treatments in Gumsan field was wider than Milyang. SPAD-502 chlorophyll meter reading explained 43.4% of the variability in N content of leaves in Gumsan field at $150^{th}$ day after seedling (DAS) and 45.9% in Milyang at $239^{th}$ DAS. Indexes of red sensor (RNDVI) and amber sensor (ANDVI) at $172^{th}$ day after seedling (DAS) in Gumsan explained 50% and 57% of the variability in N content of leaves. RNDVI and ANDVI at $31^{th}$ DAS in Milyang explained 60% and 65% of the variability in DW of leaves. Based on the relationship between ANDVI and N application rate, ANDVI at $172^{th}$ DAS in Gumsan explained 57% of the variability in N application rate but non significant relationship in Milyang field. Average sufficiency index (SI) calculated from ratio of each measurement index per maximum index of ANDVI at $172^{th}$ DAS in Gumsan explained 73% of the variability in N application rate. Although the relationship between NDVIs and growth characteristics was various upon growing season, SI by NDVIs of ground based remote sensors at top dressing season was thought to be useful index for recommendation of N top dressing rate of leaf perilla.