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Measure of Effectiveness Analysis of Passive SONAR System for Detection (수동소나시스템에서 탐지효과도 분석)

  • Cho, Jung-Hong;Kim, Jea-Soo
    • Journal of the Korea Institute of Military Science and Technology
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    • v.15 no.3
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    • pp.272-287
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    • 2012
  • The optimal use of sonar systems for detection is a practical problem in a given ocean environment. In order to quantify the mission achievability in general, measure of effectiveness(MOE) is defined for specific missions. In this paper, using the specific MOE for detection, which is represented as cumulative detection probability(CDP), an integrated software package named as Optimal Acoustic Search Path Planning(OASPP) is developed. For a given ocean environment and sonar systems, the discrete observations for detection probability(PD) are used to calculate CDP incorporating sonar and environmental parameters. Also, counter-detection probability is considered for vulnerability analysis for a given scenario. Through modeling and simulation for a simple case for which an intuitive solution is known, the developed code is verified.

Preparation and Characterization of Poly(lactic acid) Nanocomposites Reinforced with Lignin-containing Cellulose Nanofibrils (리그닌 함유 셀룰로오스 나노섬유로 강화된 폴리락틴산 나노복합재의 제조 및 분석)

  • Sun, Haibo;Wang, Xuan;Zhang, Liping
    • Polymer(Korea)
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    • v.38 no.4
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    • pp.464-470
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    • 2014
  • A chemo-mechanical method was used to prepare lignin-containing cellulose nanofibrils(L-CNF) from unbleached woodpulps dispersed uniformly in an organic solvent. L-CNF/PLA composites were obtained by solvent casting method. The effects of L-CNF concentration on the composite performances were characterized by tensile test machine, contact angle machine, scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FTIR). The tensile test results indicated that the tensile strength and elongation-at-break increased by 50.6% and 31.8% compared with pure PLA. The contact angle of PLA composites decreased from $79.3^{\circ}$ to $68.9^{\circ}$. The FTIR analysis successfully showed that L-CNF had formed intermolecular hydrogen bonding with PLA matrix.

Temporomandibular joint involvement in malignant otitis externa: a case report (측두하악관절을 침범한 악성 외이도염의 치험례)

  • Byun, In-Young;Kim, Jin-Hong;Kang, Sang-Hoon;Kim, Moon-Key
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • v.37 no.6
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    • pp.535-538
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    • 2011
  • Malignant otitis externa (MOE) originates as inflammation of the epidermis in the external auditory canal, and spreads to the surrounding structures and neck, leading to abscess formation. MOE is associated with an immunosuppressive condition and diabetes. Patients with MOE suffer from otalgia, otorrhea and hearing loss. According to the literature, surgery to the temporomandibular joint is controversial as the treatment of choice.

The Within-tree Variation in Wood Density and Mechanical Properties and Their Relationship in Juniperus polycarpos

  • Kiaei, Majid;Bakhshi, Reza;Saffari, Mohsen;Golkari, Sadegh
    • Journal of Forest and Environmental Science
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    • v.31 no.4
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    • pp.267-271
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    • 2015
  • The variations of wood density and mechanical properties of Juniperus polycarpos trees were studied in a natural forest in Iran. Sample disks were taken from each tree to examine wood density and mechanical properties (MOE and MOR) from pith to bark at breast height, 50%, and 75% of total tree height. The analysis of variance (ANOVA) indicated that radial position and height significantly affected all wood properties. The wood density, MOE and MOR were decreased along horizontal position from the pith to the bark and vertical direction from base upwards. Regression analysis showed that modulus of elasticity (MOE) and modulus of rupture (MOR) had a positive correlation with wood density.

Effects of Transducer Position in Ultrasonics Nondestructive Tests of Finger-Jointed Lumber (손가락결합부재에 대한 초음파 비파괴시험에서 센서 위치의 영향)

  • Jang, Sang-Sik
    • Journal of the Korean Wood Science and Technology
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    • v.26 no.1
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    • pp.1-6
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    • 1998
  • 손가락결합부재에 대한 정적휨시험 및 초음파 비파괴시험을 실시하였다. 발신 및 수신 변환기의 상대 위치와 두 변환기 사이의 거리에 따른 음전달속도의 변화를 분석하였으며 정적 휨시험으로 부터 구한 MOE 및 MOR과 비교하였다. MOR과 음전달속도는 손가락의 경사가 증가할수록 감소하였다. MOR은 음전달속도와 매우 밀접한 상관관계를 보였으나 MOE는 손가락의 경사도나 음전달속도에 큰 영향을 받지 않는 것으로 나타났다. 음전달속도는 섬유방향이 방사방향이나 접선방향에 비하여 더 높은 값을 나타내었다. 발신 및 수선 변환기를 동일면에 부착한 경우에 직각면 또는 반대면에 부착한 경우보다 더 높은 음전달속도를 나타내었다. 변환기 사이의 거리가 증가할수록 음전달속도는 양끝면에 변환기를 부착한 경우의 속도에 수렴하는 경향을 나타내었다.

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Effectiveness Analysis for Required Capabilities of Tilt-rotor UAV (틸트로터 무인기의 요구능력 효과도 분석)

  • Lee, Ki Young
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.21 no.2
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    • pp.15-20
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    • 2013
  • In order to set up the optimal required capabilities to satisfy a variety of domestic and foreign demands for the Tilt-rotor UAV, MOE(Measure of Effectiveness) hierarchy was designed through an expert discussion, and the weight of the MOE was determined by utilizing AHP method. The independent MOE assessment on the required capabilities was accomplished for the current configuration, available alternatives and foreign competitive UAVs. Finally the cost-effectiveness for the alternative and competition UAV was analyzed.

Accurate Stitching for Polygonal Surfaces

  • Zhu, Lifeng;Li, Shengren;Wang, Guoping
    • International Journal of CAD/CAM
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    • v.9 no.1
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    • pp.71-77
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    • 2010
  • Various applications, such as mesh composition and model repair, ask for a natural stitching for polygonal surfaces. Unlike the existing algorithms, we make full use of the information from the two feature lines to be stitched up, and present an accurate stitching method for polygonal surfaces, which minimizes the error between the feature lines. Given two directional polylines as the feature lines on polygonal surfaces, we modify the general placement method for points matching and arrive at a closed-form solution for optimal rotation and translation between the polylines. Following calculating out the stitching line, a local surface optimization method is designed and employed for postprocess in order to gain a natural blending of the stitching region.

Improvement of Sewerage Treatment System (하수도 업무추진체계 개선)

  • Lee, Chan-Hui
    • 수도
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    • v.24 no.5 s.86
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    • pp.5-15
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    • 1997
  • This year the Ministry of Environment(MOE) made a fifth amendment to the Sewerage Act, which was enacted in August 1966. The first objective of this amendment is to introduce small public sewerage system that is designed to treat wastewater produced in rural areas. Before small public sewerage system was introduced to the Act through this amendment, only urban areas were covered by public sewerage system. Because small sewerage system was introduced, wastewater generated in urban areas as well as rural areas can now be treated by public sewage treatment plants. In addition to this, some authorities on sewerage affairs were moved from the MOE to local governments by this amendment in order to enhance the power and responsibility of local governments in relation to sewerage affairs. Also, this amendment enabled local governments to entrust the authority to establish and manage sewage treatment plants to private companies, and enabled the MOE to organize an advisory committee on sewerage to review economic and technical aspects ofsewage treatment plants. This amendment went into effect September 8, 1997.

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Anti-Diabetic, Alcohol-Metabolizing, and Hepatoprotective Activities of Moringa (Moringa oleifera Lam.) Leaf Extracts (모링가 잎 추출물의 항당뇨, 알코올 대사 및 간 보호 활성)

  • Choi, Young Ju;Jung, Kyung Im
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.45 no.6
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    • pp.819-827
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    • 2016
  • This study was carried out to investigate anti-inflammatory, anti-diabetic, alcohol metabolizing, and hepatoprotective effects of hot water (MOW) and 80% ethanol (MOE) extracts from moringa (Moringa oleifera Lam.) leaf. The total phenol content of MOW and MOE were 45.49 and 63.06 mg tannic acid equivalents/g, respectively. 1,1-Diphenyl-2-picrylhydrazyl radical scavenging activities of MOW and MOE were remarkably elevated in a dose-dependent manner, and about 60.8% and 71.3% at 1 mg/mL, respectively (P<0.01). Superoxide dismutase-like activities of MOW and MOE were 2.8% and 7.4% at 5 mg/mL, respectively (P<0.05). ${\alpha}-Glucosidase$ inhibitory activity also increased in a dose-dependent manner in both extracts, and MOE was higher about two times than MOW at 5 mg/mL (P<0.001). The effects of MOW and MOE on alcohol metabolizing activity were determined by measuring generation of reduced nicotinamide adenine dinucleotide (NADH) by alcohol dehydrogenase (ADH) and acetaldehyde dehydrogenase (ALDH). ADH and ALDH activities significantly increased upon addition of MOW and MOE (P<0.05). Anti-inflammatory activity was examined in lipopolysaccharide-stimulated RAW 264.7 cells. Nitric oxide production was reduced to 32.1% and 81.2% by addition of MOW and MOE at 1 mg/mL, respectively (P<0.05). MOW and MOE showed significant protective effects against tacrine-induced cytotoxicity in Hep3B cells at $100{\mu}g/mL$. These results suggest that moringa leaf extracts have great potential as natural health products.

Effect of freezing on electrical properties and quality of thawed chicken breast meat

  • Wei, Ran;Wang, Peng;Han, Minyi;Chen, Tianhao;Xu, Xinglian;Zhou, Guanghong
    • Asian-Australasian Journal of Animal Sciences
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    • v.30 no.4
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    • pp.569-575
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    • 2017
  • Objective: The objective of this research was to study the electrical properties and quality of frozen-thawed chicken breast meat and to investigate the relationship between these parameters at different times of frozen storage. Methods: Thawed samples of chicken breast muscles were evaluated after being kept in frozen storage at $-18^{\circ}C$ for different periods of time (1, 2, 3, 4, 5, 6, 7, and 8 months). Results: The results showed that water-holding capacity (WHC) and protein solubility decreased while thiobarbituric acid-reactive substances content increased with increasing storage time. The impedance module of samples decreased during 8-month frozen storage. Pearson correlation coefficients showed that the impedance change ratio (Q value) was significantly (p<0.05) related to pH, color, WHC, lipid oxidation and protein solubility, indicating a good relationship between the electrical properties and qualities of frozen-thawed chicken breast meat. Conclusion: Impedance measurement has a potential to assess the quality of frozen chicken meat combining with quality indices.