• Title/Summary/Keyword: DT

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The study on the separation characteristics of heavy metal ion by inorganic oxides and ion exchange resin (무기산화물 및 이온교환수지에 의한중금속 이온 분리특성 연구)

  • Dan, Cheol Ho;Kim, eong Ho;Yang, Hyun Soo
    • Clean Technology
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    • v.12 no.1
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    • pp.37-44
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    • 2006
  • The effectiveness of inorganic oxides (DT-30), anionic exchange resin (DT-60) and carbon absorbent (DT-80, DT-90) on the equilibrium and continuous separation characteristics and removal of cobalt, cesium and iodide ion in the waste water was investigated. As a result, DT-30, DT-80 or DT-90, and DT-60 showed excellent separation properties on the cesium, cobalt and iodide respectively. In the equilibrium experiment, the adsorption amount of cesium for DT-30 increased with temperature, but increasd largely with pH. In case of DT-80, adsorption of cobalt was depended on pH but was not influenced by temperature. In the continuous system by passing a heavy metal ion solution through the ion exchange tower, DT-30, DT-90 and DT-60 showed good separation characteristic for cesium, cobalt and iodide respectively. In this case, separation characterization of DT-30 on the cesium and of DT-60 on the iodide were better than that of DT-90 on the cobalt. From the experiment on the effect of impurities on the ion exchange characteristics, impurities such as surfactant and oil did not influence the efficiency of DT-90. In the mean while, ion separation capacity of DT-30 were decreased largely by impurities such as surfactant and oil. Also, surfactant had a strong influence on the effectiveness of DT-60. Accordingly, it turned out to be very important thing that impurities should be removed in the preprocessing stage.

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A Study on the Refractive State of the School Children (초등학교 학생들의 굴절 상태에 관한 고찰)

  • Lee, Hark Jun;Kim, Hong Gyun
    • Journal of Korean Ophthalmic Optics Society
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    • v.1 no.2
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    • pp.57-61
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    • 1996
  • As a result of visual acuity test of school children, the visual acuity is better girls than and more elder than younger. The Hyperopia of the Above ten aged children is decreased in boys rather than girls and Especially for who have +0.75Dt and below. The visual acuity of Ampetropia is 0.77 in +0.75 Dt and belows, 0.50 in +1.00 Dt and 0.33 in 3.00 Dt. Myopia is increased as age. Possibility of having Myopia is bigger for females than for males. Especially the -0.15 Dt and below in males and from -1.000t Dt -1.75 Dt in Females are easy to have it. The Ampetropia of the visual acuity is 0.67 in -0.75Dt and below, 0.38 in -1.00Dt, 0,28 in -2.00Dt and 0.20 in -3.00 Dt.

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How Does Digital Transformation Improve the Quality of Life? Evidence from Korean Older Adults

  • Moon-Yong Kim
    • International journal of advanced smart convergence
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    • v.13 no.3
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    • pp.205-213
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    • 2024
  • Digital transformation (DT) has gained global attention in various service industries, due to the pervasive nature and proliferation of recent digital technologies. Given that we live in an age of DT, the current research examines the factors influencing the older adults' quality of life due to DT. Specifically, we examine whether the older adults' digital skills (i.e., ability to use applications and self-efficacy in using digital devices) and motivational factors regarding DT (i.e., involvement in DT and need for cognition regarding DT) predict their quality of life due to DT. To answer the research question, we conducted a hierarchical multiple regression analysis using the elderly Korean adults aged 65 or older. The results indicate that the older adults' ability to use applications, self-efficacy in using digital devices, involvement in DT, and need for cognition regarding DT are positively associated with quality of life due to DT. The findings provide important implications to improve the elderly's quality of life due to DT.

Data Technology: New Interdisciplinary Science & Technology (데이터 기술: 지식창조를 위한 새로운 융합과학기술)

  • Park, Sung-Hyun
    • Journal of Korean Society for Quality Management
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    • v.38 no.3
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    • pp.294-312
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    • 2010
  • Data Technology (DT) is a new technology which deals with data collection, data analysis, information generation from data, knowledge generation from modelling and future prediction. DT is a newly emerged interdisciplinary science & technology in this 21st century knowledge society. Even though the main body of DT is applied statistics, it also contains management information system (MIS), quality management, process system analysis and so on. Therefore, it is an interdisciplinary science and technology of statistics, management science, industrial engineering, computer science and social science. In this paper, first of all, the definition of DT is given, and then the effects and the basic properties of DT, the differences between IT and DT, the 6 step process for DT application, and a DT example are provided. Finally, the relationship among DT, e-Statistics and Data Mining is explained, and the direction of DT development is proposed.

Obstacle Avoidance for a Remote Mobile Robot Using Modified DT Algorithm (수정형 DT알고리즘을 이용한 원격 이동 로봇의 장애물 회피)

  • Lee, Kee-Seong;Cho, Hyun-Chul
    • Proceedings of the KIEE Conference
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    • 1999.07g
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    • pp.3095-3097
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    • 1999
  • A New path planning using modified DT(distance transform) algorithm for a remote mobile robot is proposed. The weakness of DT algorithm is that the generated path is not the best path of all possible paths. Modified DT algorithm proposed can compensate for the weakness of DT algorithm, but the operating time of the proposed is longer than that of DT algorithm.

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A Study of Abnormal Refraction Eye on the 30's employees (30대 직장인의 굴절이상안에 대한 연구)

  • Lee, Young-Il;Lee, Young-Dal
    • Journal of Korean Ophthalmic Optics Society
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    • v.6 no.2
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    • pp.115-119
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    • 2001
  • To research the refractive error of the eyes on the 30's employees, 510 eyes were tested by the object and subject methods. The results were as follows. 1. Among the 510 eyes, myopia is 74.4%, hyperopia is 0.9% and emmetropia is 24.7%, respectively. 2. In test, the low myopia (-0.50Dt < Spherical Equivalent ${\leq}$ -2.00Dt) is 24.1%, the middle myopia(-2.00Dt < Spherical Equivalent ${\leq}$ -6.00Dt) is 51.4%, the high myopia(-6.00Dt < Spherical Equivalent) is 14.8% and the low hyperopia(+0.50Dt < Spherical Equivalent ${\leq}$ +2.00Dt) is 1.2%, respectively. 3. In test of astigmatism, the amount of astigmatism with-the rule is 58.5%, the amount of astigmatism against-the rule is 22.6% and the amount of astigmatism with oblique is 18.9%, respectively.

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Effects of Sanjointang on Hemodynamic Functions of Isolated Rat Heart Induced by Sleep Deprivation (산조인탕이 수면박탈 흰쥐 심장의 혈역학적 기능에 미치는 영향)

  • Shin, Yu-Jeong;Kim, Deog-Gon
    • The Journal of Pediatrics of Korean Medicine
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    • v.24 no.3
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    • pp.106-120
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    • 2010
  • Objectives: Sanjointang has been clinically used much for treating sleeplessness. However, the effects of Sanjointang in artificial sleep deprivation situations are not known. The purpose of this study is to evaluate the heart rate, left ventricular systolic pressure, left ventricular diastolic pressure, +dp/dt maximum, -dp/dt maximum, and -dp/dt / +dp/dt ratio which are related to the hemodynamic functions of the heart by using sleep-deprived Sparague-Dawley rats, in order to clarify the impact of Sanjointang on hemodynamic functions of the heart of sleep deprived rats. Methods: Eighteen hearts were removed from the male Sparague-Dawley rats weighting about 180g were perfused by the Langendorff technique with modified 37 Krebs-Henseleit's buffer solution at a constant perfusion pressure (60mmHg). They were randomly assigned to one of the following three groups, 1) Normal group (those which did not have sleep deprivation and received normal saline administration), 2) Control group (sleep deprived and normal saline administered), 3) Sample group (sleep deprived and Sanjointang was administered). Control and sample groups rats were deprived 96 hours of sleep by using the modified multiple platform technique. Heart rate, left ventricular systolic pressure, left ventricular diastolic pressure, +dp/dt maximum, -dp/dt maximum, -dp/dt / +dp/dt ratio were evaluated at baseline after the administration of either normal saline or Sanjointang. Results: The heart rate and -dp/dt / +dp/dt ratio was significantly decreased in rats with 96 hours of sleep deprived significantly decreased. The change in the heart rate after administering Sanjointang did not show any significant difference. The left ventricular systolic pressure of the removed heart significantly decreased due to Sanjointang administration, while the left ventricular diastolic pressure significantly increased (p<0.05). The +dp/dt maximum and -dp/dt maximum both significantly decreased in the removed heart after administering Sanjointang. (p<0.05). There was no significant difference observed in the -dp/dt / +dp/dt ratio after administering Sanjointang. Conclusions: According to the results above, sleep deprivation significantly decreases heart rate and -dp/dt / +dp/dt ratio. This is considered as a result of exhaustion due to accumulation of fatigue. Meanwhile, Sanjointang reduced left ventricular systolic pressure and raised left ventricular diastolic pressure, and relieved the contractility and relaxation of the myocardium. Consequently, this reduces the burden of the heart and creates a relatively stabilized heart condition similar to a sleeping condition.

An Evaluation of the Anti-thrombosis and Antioxidant Activities of Different Parts of Dystaenia takeshimana (섬바디 부위별 추출물의 항혈전 및 항산화 활성)

  • Kang, Deok-Gyeong;Lee, Yun-Jin;Kim, Jong Sik;Sohn, Ho-Yong
    • Journal of Life Science
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    • v.32 no.4
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    • pp.303-309
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    • 2022
  • Dystaenia takesimana is an endemic plant found only in Korea, especially on Ulleung Island. The leaves and roots of D. takesimana have been used as food, forage, and oriental medicine. Anti-bacterial, anti-inflammation, antioxidant, and α-glucosidase inhibition biological activities have been reported in the plant's root extract. However, studies concerning the anti-thrombosis activities of D. takesimana are still in the rudimentary stage. In this study, the extracts of the leaf (DT-L), stem (DT-S), and root (DT-R) of D. takesimana were prepared using 70% ethanol, and their anti-thrombosis activities were evaluated. DT-L extracts (0.25 mg/ml) showed strong inhibitions against platelet aggregation, comparable to aspirin, with strong radical scavenging activities. Furthermore, the DT-L extract did not show any RBC hemolysis up to 1 m/ml. The ant-coagulation and antioxidant activities of the DT-S extract were ignorable. While the DT-R extract showed inhibitions against thrombin and blood coagulation factors, it also showed strong platelet aggregation. This is a first report of the anti-thrombosis activities of D. takesimana, and our results suggest that DT-L could be developed as a valuable bioresource for high value-added products.

Resonant Formation Rates of Muonic Molecular ion in Muon-Catalyzed Fusion (뮤온 촉매 핵융합에서 뮤온 분자 이온의 공명 형성율)

  • Im, Ki-Hak;Hong, Sang-Hee
    • Nuclear Engineering and Technology
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    • v.24 no.1
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    • pp.63-74
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    • 1992
  • The resonant formation rates of muonic molecular ion dtr in the muon-catalyzed fusion are calculated in various fuel temperatures and densities. The elastic scattering cross sections between t$\mu$ and deuterons are obtained by making use of the partial wave method. The transition property of the excited compound molecule [(dt$\mu$)dee]* derived by the impulse approximation in the form of a bound-state form factor. The radiative, Auger, and collisional deexcitations are considered as the deexcitation mechanisms of the excited dt$\mu$, and each deexcitation width is calculated as well as back decay width. The resultant reaction widths are used to calculate the formation cross sections of resonant dt$\mu$. The resonant formation rates for dt$\mu$-d and dt$\mu$-t collisions are computed as functions of fuel temperature and density. The calculations show that the resonant formation rates increase with fuel densities and have the maximum values at the particular temperatures where the relative collision energies are equal to the resonant ones.

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The effects of cryopreservation on human dental pulp-derived mesenchymal stem cells

  • Tomlin, Allison;Sanders, Michael B;Kingsley, Karl
    • Biomaterials and Biomechanics in Bioengineering
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    • v.3 no.2
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    • pp.105-114
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    • 2016
  • The purpose of this study is to evaluate the effects of cryopreservation on dental pulp-derived stem cells (DPSC) viability over a period of three years. Dental pulp-derived stem cells were isolated and cultured from thirty-one healthy teeth. DPSC isolates were assessed for doubling-time and baseline viability prior to cryopreservation and were assessed again at three time points; one week (T1), 18 months (T2), and 36 months (T3). DPSC can be grouped based on their observed doubling times; slow (sDT), intermediate (iDT), and rapid (rDT). Viability results demonstrated all three types of DPSC isolates (sDT, iDT and rDT) exhibit time-dependent reductions in viability following cryopreservation, with the greatest reduction observed among sDT-DPSCs and the smallest observed among the rDT-DPSC isolates. Cryopreserved DPSCs demonstrate time-dependent reductions in cellular viability. Although reductions in viability were smallest at the initial time point (T1) and greatest at the final time point (T3), these changes were markedly different among DPSC isolates with similar doubling times (DTs). Furthermore, the analysis of various DPSC biomarkers - including both intracellular and cell surface markers, revealed differential mRNA expression. More specifically, the relative high expression of Sox-2 was only found only among the rDT isolates, which was associated with the smallest reduction in viability over time. The expression of Oct4 and NANOG were also higher among rDT isolates, however, expression was comparatively lower among the sDT isolates that had the highest reduction in cellular viability over the course of this study. These data may suggest that some biomarkers, including Sox-2, Oct4 and NANOG may have some potential for use as biomarkers that may be associated with either higher or lower cellular viability over long-term storage applications although more research will be needed to confirm these findings.