• Title/Summary/Keyword: classification tests

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The Results of the ATP Based Chemotherapy Response Assay in Gastric Cancer Tissues (ATP-CRA 방법을 이용한 위암조직의 항암제 감수성 검사결과)

  • Lee, Je-Hyung
    • Journal of Gastric Cancer
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    • v.7 no.3
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    • pp.160-166
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    • 2007
  • Purpose: Recently, chemosensitivity tests have become widely used for the selection of effective drugs in gastric cancer patients. In this study, a chemosensitivity test was performed to select agents to increase the effectiveness of adjuvant chemotherapy. Materials and Methods: Chemosensitivity testing was performed in 81 gastric cancer patients that received a gastrectomy at the Yeungnam University Hospital. An ATP (adenosine triphosphate) based chemotherapy response assay was used. Clinicopatholgical factors such as sex, age, expression of tumor markers (CEA and CA19-9 levels), location of the tumor, morphology of advanced cancer, histological type, cell differentiation, depth of invasion, Lauren classification, Ming classification, lymphatic invasion, vascular invasion, neural invasion, lymph node metastasis and TNM stage were used to correlate the chemosensitivity and clinicopathological factors. Results: The most effective antitumor agents in gastric cancer patients were (in order of effectiveness) 5-FU, Epirubicin, lrinotecan and Oxaliplatin in our series. The chemosensitivity test showed a significant difference in susceptibility according to clinicopathological factors. Conclusion: Further studies on multidrug therapy are needed to evaluate synergistic effects of drugs. Therefore, for effective chemotherapy, it is more efficacious to select a chemosensitive drug than continue to use the same drug regimen.

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Classification of cold regions and analysis of the freeze-thaw repetition cycle based on heat transfer quantity by freezing test (실내동결시험을 통한 열류량 분석에 따른 동결-융해 조건 분석 및 한랭지역의 분류)

  • An, Jai-Wook;Seo, Jeong-Eun;Jung, Min-Hyung;Seong, Joo-Hyun
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.20 no.6
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    • pp.957-972
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    • 2018
  • Tunnels constructed in cold regions can cause serious defects such as cracks and leaks due to external temperature changes in the portals and vents. In order to prevent the freezing damage of the tunnel, appropriate measures should be applied to the section where the freeze damage is concerned. However, the specific criteria and contents for judging whether or not the anti-freeze measures are applied are not presented. In this study, the laboratory freezing tests on the temperature changes of the concrete specimens under freezing conditions were carried out. And the freeze-thaw repetition cycle (F), which can judge the possibility of freezing damage, were presented based on the heat transfer quantity (W) by experimental results of case studies. Also, we propose a classification of cold regions considering the climatic characteristics of Korea for using it to efficient design and maintenance.

A Study on the Rainfall Infiltration Capacity of Soil (A Study on the Mid-Mountain Area of Jeju Island) (강우의 토양 침투 투수성 연구(제주도 중산간 지역을 중심으로))

  • Jeon, Byeong Chu;Lee, Su Gon;Kim, Sung Soo;Kim, Ki Su;Kim, Nam Ju
    • The Journal of Engineering Geology
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    • v.29 no.2
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    • pp.99-112
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    • 2019
  • Rainfall infiltration through the unsaturated zone is influenced by a range of factors including topography, geology, soil, rainfall intensity, temperature and vegetation; the actual infiltration varies largely in time and space. The infiltration capacity of soil is a critical factor in identifying groundwater recharge and leakage of surface water. It may differ depending on soil types and geological features of a particular basin or territory as well as on the usage of the land. This study was conducted in forest and farmland region of the mid-mountain area (EL. 50~300 m) of Jeju Island to test soil infiltration capacity of the area where rainfall contributes to groundwater. Results were analyzed using the four soil group classification methods presented by Jeong et al. (1995) and NAS (2007) to discover that the method offered by NAS (2007) is more reliable in the mid-mountain area of Jeju Island. The study compares and reviews the existing classification methods using the results of infiltration capacity tests executed on different soil groups throughout the whole region of the Jeju mid-mountain area. It is expected that this work will serve as a guideline for evaluating surface water recharge and hydraulic characteristics of Jeju Island.

Soil Layer Distribution and Soil Characteristics on Dokdo (독도의 토층 분포 및 토질 특성)

  • Kyeong-Su Kim;Young-Suk Song;Eunseok Bang
    • The Journal of Engineering Geology
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    • v.33 no.3
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    • pp.475-487
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    • 2023
  • We surveyed the distribution of soil layers on Dongdo and Seodo of Dokdo and measured the physical properties of the soils. To investigate the distribution of soil layers, the soil depth was measured directly in accessible locations, and visual observations of inaccessible locations were carried out using drones and boats. Soil depths ranged from 3 to 50 cm, and most soil layers had depths of 10~20 cm. Based on these results, a map of the soil layer was drawn using 5 cm intervals for soil depth. To analyze the soil characteristics of Dokdo, soil samples were collected from 13 locations on Dongdo and 13 locations on Seodo, in consideration of various geological settings. According to the results of grain size distribution tests, sand contents were >75%, and soil from Seodo contained more gravel-sized particles than that from Dongdo. Using the unified soil classification system (USCS) and textural classification chart of the United States Department of Agriculture (USDA), most of the soil samples from Dokdo are classified as sand, and some are classified as loamy or clayey sand. In addition, well-graded loamy or clayey sands are more common in Dongdo, and poorly graded sands with gravel are more common in Seodo. These results are expected to be important for studying soil characteristics on Dokdo.

Video classifier with adaptive blur network to determine horizontally extrapolatable video content (적응형 블러 기반 비디오의 수평적 확장 여부 판별 네트워크)

  • Minsun Kim;Changwook Seo;Hyun Ho Yun;Junyong Noh
    • Journal of the Korea Computer Graphics Society
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    • v.30 no.3
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    • pp.99-107
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    • 2024
  • While the demand for extrapolating video content horizontally or vertically is increasing, even the most advanced techniques cannot successfully extrapolate all videos. Therefore, it is important to determine if a given video can be well extrapolated before attempting the actual extrapolation. This can help avoid wasting computing resources. This paper proposes a video classifier that can identify if a video is suitable for horizontal extrapolation. The classifier utilizes optical flow and an adaptive Gaussian blur network, which can be applied to flow-based video extrapolation methods. The labeling for training was rigorously conducted through user tests and quantitative evaluations. As a result of learning from this labeled dataset, a network was developed to determine the extrapolation capability of a given video. The proposed classifier achieved much more accurate classification performance than methods that simply use the original video or fixed blur alone by effectively capturing the characteristics of the video through optical flow and adaptive Gaussian blur network. This classifier can be utilized in various fields in conjunction with automatic video extrapolation techniques for immersive viewing experiences.

Permeability Characteristics of Soils Mixed with Powdered Sludge of Basalt (현무암 석분슬러지 혼합토의 투수특성)

  • Kim, Ki-Young;Lee, Kang-il;Yun, Jung-Mann;Song, Young-Suk;Kim, Tae-Hyung
    • Journal of the Korean Geosynthetics Society
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    • v.14 no.2
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    • pp.89-94
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    • 2015
  • In this study, the mixed soil with an optimum mixed ratio was suggested in order to recycle the powdered sludge of basalt in Jeju Island as the impermeable liner materials. As the results of soil laboratory tests, the grain size of the powdered sludge of basalt is less than 0.1mm and the powdered sludge was classified into ML or CL category in accordance with the Unified Soil Classification System (USCS). Also, the grain size of natural soils is ranged from 0.1 mm to 10 mm and the soils were classified into SW category in USCS. To select the optimum mixed ratio of powdered sludge, the variable permeability test was performed to various mixed soils with different powdered sludge amount under both optimum compaction and field conditions. As the results of permeability tests, the coefficient of permeability of mixed soils was decreased with increasing the mixed ratio of powdered sludge, and the mixed soil with mixed ratio of 60% has the minimum coefficient of permeability. Therefore, the optimum mixed ratio of powdered sludge is 60% for recycling the powdered sludge of basalt as the impermeable liner materials.

COGNITIVE CHARACTERISTICS OF CHILDREN WITH DYSLEXIA AND/OR ATTENTION DEFICIT/HYPERACTIVITY DISORDER (읽기 장애 아동과 주의력 결핍/과잉 활동장애 아동의 인지적 특성)

  • Kim, Seung-Tai;Kim, Ji-Hae
    • Journal of the Korean Academy of Child and Adolescent Psychiatry
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    • v.7 no.2
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    • pp.224-232
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    • 1996
  • The present study was conducted to investigate cognitive characteristics of children with dyslexia and/or attention deficit/hyperacidity disorder. Cognitive characteristics were evaluated by using KEDI-WISC, the Basic Achievement Test, TOVA, MFFT, and neuropsychological tests. ADHD group showed significantly lower level of performance in response time for correct responses and presented variability for correct responses in TOVA. Dyslexia and mixed group showed lower performance in Reading I and Reading II, Writing subtest in the Basic Achievement Test than those of ADHD group and in Information subtest of KEDI-WfSC. In order rd determine the diagnostic effectiveness of each psychological tests, discriminant analysis was conducted. In this analysis, 11 subtests of KEDI-WISC and 4 variables of TOVA, 4 subtests of the Basic Achievement Test, and MFFT, WCST were included as independent variables and each diagnostic roups were dependent variables. Discriminant analysis indicated that overall percentage of correct classification was 93.88%. The clinical implifications and limitations of the present study were listed and discussed.

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Comparative Study on the Characteristics of Microalgae as Standard Species for Marine Ecotoxicity Tests (Skeletonema sp., Dunaliella tertiolecta) (해양생태독성시험 표준생물로서 미세조류의 특성 비교 연구(Skeletonema sp., Dunaliella tertiolecta))

  • Kim, Tae Won;Moon, Chang Ho;Lee, Su Jin
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.26 no.5
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    • pp.514-522
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    • 2020
  • To understand the ecotoxicological differences between representative Skeletonema sp. and Dunaliella tertiolecta, both producers as international standard test species for marine ecotoxicity testing, we compared each standard test method, and comparatively analyzed the suitability of the species for environmental assessment and their sensitivity to various test substances. Although most of the test conditions were the same in each method, there were differences in limitation of pH changing and the initial inoculation density in the validation criteria, which is supposed to originate from the low growth rate of D. tertiolecta. In terms of suitability, both species showed consistency in test performance by repeatedly meeting the validation criteria required by the standard test methods. The salinity ranges available for testing were 20 and 10 psu for Skeletonema sp. and D. tertioelecta, respectively. Finally, regarding sensitivity, the toxicity sensitivity of Skeletonema sp. was relatively higher than that of D. tertiolecta for the reference toxicant, actual polluted water discharged (ballast water), and other chemicals. This implies that using at least two species of microalgae from different classification groups could help increase the reliability and objectivity of test results in the performance of marine ecotoxicity tests using producers.

A USEFULNESS OF KEDI-INDIVIDUAL BASIC LEARNING SKILLS TEST AS A DIAGNOSTIC TOOL OF LEARNING DISORDERS (학습 장애아 진단 도구로 기초 학습 기능 검사의 유용성에 관한 연구)

  • Kim, Ji-Hae;Lee, Myoung-Ju;Hong, Sung-Do;Kim, Seung-Tai
    • Journal of the Korean Academy of Child and Adolescent Psychiatry
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    • v.8 no.1
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    • pp.101-112
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    • 1997
  • The purpose of this study was to examine usefulness of KEDI-Individual Basic Learning Skills Test as a diagnostic tool of learning disorders(LD). Learning disorder group consisted of two subgroups, verbal learning disorder group(VLD, n=34) and nonverbal learning disorder group(NVLD, n=14). Comparison group consisted of Dysthymia Disorder subgroup(n=11) and Normal subgroup(n=20). Performance of intelligence test and achievement test was examined in all 4 subgroups. In KEDI-WISC, VLD subgroup revealed primary problems in vocabulary, information and verbal-auditory attention test. NVLD group revealed primary problems in almost all performance tests such as visual acuity, psycho-motor coordination speed and visual-spatial organizations ability subtest. In KEDI-Individual Basic Learning Test, VLD group revealed primary problems in phonological coding process, word recognition and mathematics. For successful classification of LD children, the importance of achievement test and intelligence test was discussed by discriminant analysis and factor analysis. The results indicate that KEDI-Individual Basic Learning Skills is of considerable usefulness in diagnosing LD, but must be used in subtests, and additional tests must be conducted for thorough exploration of LD.

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Application of linear-array microtremor surveys for rock mass classification in urban tunnel design (도심지 터널 암반분류를 위한 선형배열 상시진동 탄성파 탐사 적용)

  • Cha, Young-Ho;Kang, Jong-Suk;Jo, Churl-Hyun
    • Geophysics and Geophysical Exploration
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    • v.9 no.1
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    • pp.108-113
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    • 2006
  • Urban conditions, such as existing underground facilities and ambient noise due to cultural activity, restrict the general application of conventional geophysical techniques. At a tunnelling site in an urban area along an existing railroad, we used the refraction microtremor (REMI) technique (Louie, 2001) as an alternative way to get geotechnical information. The REMI method uses ambient noise recorded by standard refraction equipment and a linear geophone array to derive a shear-wave velocity profile. In the inversion procedure, the Rayleigh wave dispersion curve is picked from a wavefield transformation, and iteratively modelled to get the S-wave velocity structure. The REMI survey was carried out along the line of the planned railway tunnel. At this site vibrations from trains and cars provided strong seismic sources that allowed REMI to be very effective. The objective of the survey was to evaluate the rock mass rating (RMR), using shear-wave velocity information from REMI. First, the relation between uniaxial compressive strength, which is a component of the RMR, and shear-wave velocity from laboratory tests was studied to learn whether shear-wave velocity and RMR are closely related. Then Suspension PS (SPS) logging was performed in selected boreholes along the profile, in order to draw out the quantitative relation between the shear-wave velocity from SPS logging and the RMR determined from inspection of core from the same boreholes. In these tests, shear-wave velocity showed fairly good correlation with RMR. A good relation between shear-wave velocity from REMI and RMR could be obtained, so it is possible to estimate the RMR of the entire profile for use in design of the underground tunnel.