• Title/Summary/Keyword: DGT

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Double-guidewire technique for selective biliary cannulation does not increase the rate of post-endoscopic retrograde cholangiopancreatography pancreatitis in patients with naïve papilla

  • Han Taek Jeong;June Hwa Bae;Ho Gak Kim;Jimin Han
    • Clinical Endoscopy
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    • v.57 no.2
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    • pp.226-236
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    • 2024
  • Background/Aims: This study aimed to compare the safety of the double-guidewire technique (DGT) with that of the conventional single-guidewire technique (SGT) in real-world situations. Methods: A total of 240 patients with naïve papilla who underwent endoscopic retrograde cholangiopancreatography (ERCP) at Daegu Catholic University Medical Center between January 2021 and December 2021 were included. The primary outcome was the rate of post-ERCP pancreatitis (PEP) in the SGT and DGT groups. Results: A total of 163 patients (67.9%) belonged to the SGT group, and 77 (32.1%) belonged to the DGT group. The rates of successful biliary cannulation were 95.7% and 83.1% in the SGT and DGT groups, respectively (p=0.002). In the study group, PEP occurred in 14 patients (5.8%). The PEP rates were not significantly different between the SGT and DGT groups (4.3% vs. 9.1%, p=0.150). In the multivariate analysis, the age of <50 years (odds ratio [OR], 9.305; 95% confidence interval [CI], 1.367-63.358; p=0.023) and hyperlipidemia (OR, 7.384; 95% CI, 1.103-49.424; p=0.039) were significant risk factors for PEP in the DGT group. Conclusions: DGT did not increase the PEP rate in patients with naïve papilla. In addition, the age of <50 years and hyperlipidemia were significant risk factors for PEP in the DGT group.

PAPR Reduction Improvement for WHT-based OFDM System using Data Grouping Technique (왈시-하다마다 변환과 DGT 기술을 이용한 OFDM 시스템의 PAPR 감소 및 BER성능향상을 위한 연구)

  • Kong Hyung-Yun;Khuong Ho Van;Nam Doo-Hee
    • The KIPS Transactions:PartC
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    • v.12C no.4 s.100
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    • pp.511-518
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    • 2005
  • The conventional OFDM (Orthogonal Frequency Division Multiplexing) modulation can be combined with WHT (Walsh-Hadamard Transform) to reduce PAPR (Peak-to-Average Power Ratio) and improve BER (Bit Error Rate) performance. However, this WHT-based OFDM system still suffers a relatively high PAPR. Therefore, we suggest a new technique, called DGT (Data Grouping Technique) and design an OFDM system employing it and WHT to further decrease PAPR without the BER performance degradation. h salient property of DGT is the independence of the side information which is inherently a principal drawback of the well-known PAPR reduction techniques for OFDM system as well as WHT-based OFDM. The simulation programs have been also performed to verify the validity of the proposed system.

o-DGT as a Biomimic Surrogate to Assess Phytoaccumulation of Phenanthrene in Contaminated Soils (o-DGT를 생체모사 대표물질로 이용한 오염토양에서 phenanthrene의 식물축적 평가)

  • Choi, Jiyeon;Shin, Won Sik
    • Journal of Soil and Groundwater Environment
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    • v.24 no.6
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    • pp.16-25
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    • 2019
  • Anthropogenic polycyclic aromatic hydrocarbons (PAHs) are formed by the incomplete combustion of fuels and industrial waste. PAHs can be widely exposed to the environment (water, soil and groundwater). PAHs are potentially toxic, mutagenic and/or carcinogenic. Fundamental studies such as biota uptake (e.g., earthworm and plant) of PAHs are highly needed. It is necessary to develop alternative ways to evaluate bioavailability of PAHs instead of using living organisms because it is time-consuming, difficult to apply in the field, and also exaction method is tedious and time-consuming. In this study, sorption behaviors of phenanthrene were evaluated to predict the fate of PAHs in soils. Moreover, bioaccumulation of PAHs in an artificially contaminated soil was evaluated using pea plant (Pisum sativum) as a bioindicator. A novel passive sampler, organic-diffusive gradient in thin-film (o-DGT) for PAHs was newly synthesized, tested as a biomimic surrogate and compared with plant accumulation. Sorption partitioning coefficient (KP) and sorption capacity (KF) were in the order of natural soil > loess corresponding to the increase in organic carbon content (foc). Biota-to-soil accumulation factor (BSAF) and DGT-to-soil accumulation factor (DSAF) were evaluated. o-DGT uptake was linearly correlated with pea plant uptake of phenanthrene in contaminated soil (R2=0.863). The Tenax TA based o-DGT as a biomimic surrogate can be used for the prediction of pea plant uptake of phenanthrene in contaminated soil.

Ethylene-Induced Auxin Sensitivity Changes in Petiole Epinasty of Tomato Mutant dgt

  • Chang, Soo Chul;Lee, Myung Sook;Lee, Sang Man;Kim, Jinseok;Kang, Bin G.
    • Journal of Plant Biology
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    • v.37 no.3
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    • pp.257-262
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    • 1994
  • The tomato (Lycopersicon esculentum Mill.) mutant diageotropica (dgt) lacking normal gravitropic response is known to be less sensitive to auxin compared with its isogenic parent VFN8. Straight growth as well as ethylene production in response to added auxin in hypocotyl segments of dgt was negligible. However, there was no significant difference between the two genotypes in auxin transport in petiole segments and its inhibition by the phytotropin N-1-naphthylphthalamic acid(NPA). Kinetic parameters of NPA binding to microsomal membranes were also non-distinguishable between the two. Its petiolar explants treated with ethylene developed epinastic curvature with the magnitude of response increased about 3 folds over non-mutant wild type. Ethylene-induced epinasty in both dgt and VFN8 was nullified by treatment of explants with the ethylene autagonist 2,5-norbonadiene. Lateral transport of 3H-IAA toward the upper side of ethylene-treated petioles in dgt, however, was not significantly more pronounced than in VFN8, the implications being that auxin sensitivity in the mutant was restored, or even rised above the wild type, by ethylene.

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축류 압축기 기술 개발 동향

  • Song, Jae-Uk;Lee, Seong-Ryong;Lee, Sang-Eon
    • The KSFM Journal of Fluid Machinery
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    • v.12 no.5
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    • pp.61-65
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    • 2009
  • 현재 선진업체들은 성능과 구조적으로 경쟁력 있는 산업용 가스터빈 압축기를 설계하기 위하여 항공기용 압축기 설계기술을 전용하고 있다. 따라서 두산중공업은 DGT-5 압축기 익형설계를 위해 항공용 익형설계에 적용되는 S-Profile 설계기술을 활용하여 설계하였으며 현재 DGT-5 압축기에 대한 1차 성능시험이 완료되어 만족할 만한 결과를 얻었다. 그리고 DGT-5 압축기는 추후 두산중공업 파생형 가스터빈 압축기의 기본압축기로 활용할 계획이다.

Does Whistleblowing Facility Affect Taxpayer Compliance?

  • Dewi Prastiwi;Yuni Khoirotul Abdiyah
    • Asian Journal for Public Opinion Research
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    • v.12 no.2
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    • pp.102-121
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    • 2024
  • Trust is essential for tax compliance. Various tax management issues might diminish taxpayer trust. As a result, as a measure of transparency in the services of the Indonesia's Directorate General of Taxes (DGT), a method for filing various taxpayer complaints is necessary. Whistleblowing is a service given by the DGT that accepts taxpayer issues and complaints. It may be accessed on the DGT's official website. This strategy was intended to increase compliance by instilling trust among taxpayers. This study aims to show how whistleblowing affects tax compliance by utilizing trust as a mediating variable. The study relied on 400 questionnaires issued directly to East Java I DGT Region taxpayers. SEM-PLS with the Smart-PLS tool was utilized for data analysis. According to the study's findings, whistleblowing positively impacts tax compliance, and trust partially mediates the effect of whistleblowing on tax compliance. The outcomes of this study provide empirical proof for the Slippery Slope Framework's contention that building trust is an essential technique for increasing taxpayer compliance.

The Theory and Application of Diffusive Gradient in Thin Film Probe for the Evaluation of Concentration and Bioavailability of Inorganic Contaminants in Aquatic Environments (박막분산탐침(diffusive gradient in thin film probe)의 수중 생물학적 이용가능한 중금속 측정 적용)

  • Hong, Yongseok
    • Journal of Korean Society on Water Environment
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    • v.29 no.5
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    • pp.691-702
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    • 2013
  • This review paper summarizes the theory, application, and potential drawbacks of diffusive gradient in thin film (DGT) probe which is a widely used in-situ passive sampling technique for monitoring inorganic contaminants in aquatic environments. The DGT probe employs a series of layers including a filter membrane, a diffusive hydrogel, and an ionic exchange resin gel in a plastic unit. The filter side is exposed to an aquatic environment after which dissolved inorganic contaminants, such as heavy metals and nuclides, diffuse through the hydrogel and are accumulated in the resin gel. After retrieval, the contaminants in the resin gel are extracted by strong acid or base and the concentrations are determined by analytical instruments. Then aqueous concentrations of the inorganic contaminants can be estimated from a mathematical equation. The DGT has also been used to monitor nutrients, such as ${PO_4}^{3-}$, in lakes, streams, and estuaries, which might be helpful in assessing eutrophic potential in aquatic environments. DGT is a robust in-situ passive sampling techniques for investigating bioavailability, toxicity, and speciation of inorganic contaminants in aquatic environments, and can be an effective monitoring tool for risk assessment.

Thermal study of a scanning beam in granular flow target

  • Ping Lin;Yuanshuai Qin;Changwei Hao;Yuan Tian ;Jiangfeng Wan ;Huan Jia ;Lei Yang ;Wenshan Duan ;Han-Jie Cai ;Sheng Zhang
    • Nuclear Engineering and Technology
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    • v.54 no.11
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    • pp.4310-4321
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    • 2022
  • The concept of dense granular-flow target (DGT) for the China Initiative Accelerator Driven Subcritical system (CiADS) is an attractive choice for high heat removal ability, low chemical toxicity, and radiotoxicity. A wobbling hollow beam is proposed to enhance the homogeneity of temperature rise of flowing particles in beam-target coupling zone. In this paper, the design procedure of target and beam parameters was discussed firstly. Then we simulated the heat deposition and transfer of the scanning beam in DGT to study the effect of beam parameters. The results show the flux density of proton beam plays a crucial role in the distribution of temperature rise while the contributions from scanning frequency heat transfer are also obvious. Moreover, heat transfer in transversal directions is insignificant, resulting in a low heat flux towards the sidewalls of DGT. This work not only contributes to the design of DGT, but also beneficial for understanding the beam-target coupling in porous materials.

Feasibility of Diffusive Gradients in Thin Films for Monitoring Heavy Metals in Groundwater (지하수 내 중금속 모니터링을 위한 diffusive gradients in thin films의 적용 가능성 평가)

  • Kyu-Young Shim;Kwangjin Park;Seungwoo Lee;Jongmin Choi;Subin Choi;Jinsung An;Kyoungphile Nam
    • Journal of Soil and Groundwater Environment
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    • v.29 no.4
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    • pp.12-20
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    • 2024
  • Diffusive gradients in thin films (DGT) are passive sampling devices used to determine the time-weighted average concentrations (TWAC) of contaminants. To ensure accurate performance in groundwater, it is crucial to identify environmental characteristics and maintain optimal operational conditions. This study examined the deployment time required to reach effective capacity, the thickness of the diffusive boundary layer (DBL) under stagnant water conditions, and biofilm formation on the DGT surface using groundwater samples. When using DGT with Chelex gel (A=3.14 cm2), the effective capacity was 0.7 ㎍ for Cd and 250 ㎍ for Zn, with a deployment time of 24 h. Lower Cd accumulation was due to the competition effect of coexisting ions. The DBL thickness under stagnant conditions was 0.074 cm, 93% of the diffusion gel's thickness (0.08 cm). Neglecting DBL thickness in TWAC calculations led to a 79% decrease in the determined concentration. No biofouling was observed during the 28-d DGT deployment in groundwater. In conclusion, it is essential to consider the appropriate deployment time, DBL thickness, and biofilm formation to ensure accurate DGT performance in determining contaminant levels in groundwater.

A Study of Designing of Multi-Carrier CDMA System with Multi- Detector based on DGT

  • Kong, Hyung-Yun;Ho, Kwang-Chun
    • Proceedings of the IEEK Conference
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    • 2002.07b
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    • pp.1343-1345
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    • 2002
  • In this paper, we introduce the MC-CDMA (Multi-Carrier CDMA) system with MD (multi-detector). Due to unknown functional form of noise in wireless channel environments, it is not easy to design the detector through estimating the functional form of noise. Instead, we design the MD, which is constructed based on DGT (Data Grouping Technique) and quantiles estimated through RMSA (Robbins-Monro Stochastic Approximation) algorithm.

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