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RISS 인기검색어
- 검색키워드
- 저자 : Deok Chan Ahn (검색결과 52 건)
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안종필,박상범,유덕찬 朝鮮大學校 建設技術硏究所 2001 建設技術硏究 Vol.21 No.1
This study conducts the questionnaire with 320 employees who work in the construction field and head office of 80 construction companies which acquired ISO 9000 quality systems with a view to complement the problems from the application of ISO quality system to the construction industry. Acquirement of ISO certificate with the formal quality system or its formal post management adds to unnecessary tasks and will be a cause to deteriorate the progression of key projects on the business management. Therefore, when ISO 9000 quality systems is made in consideration of the scale, business capacity and customers' requirements and are suitable to the actual affairs and systematized system is established, execution quality will be improved and it will result in the decisive effects for construction field control.
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전기 치수 검사 시 역치 자극 이후 과용(過用) 자극 시간의 측정
남기창,안선희,김수찬,김덕원,이승종 大韓齒科保存學會 2004 Restorative Dentistry & Endodontics Vol.29 No.3
Use of electric pulp testing elicits painful response in vital teeth. In this study, we examined the excessive time from pain feeling to stimulation disconnection in clinical situation. D626D (Parkell Inc., USA.) scan type electric pulp tester was used in total of 23 young healthy individuals. Each of the right central incisors and first premolars were used as testing teeth. Stimulation disconnection was achieved by EMG in anterior belly of digastric muscle, finger span, and voice and the excessive stimulation time over the sensory threshold was recorded. As a result, we found that the short responses before the stimulation disconnection appeared following order: EMG, finger span, and voice. The EMG disconnection is suggested to be used to reduce the excessive stimulus time in electric pulp testing.
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Deok Chan Ahn,Yang Jin Chung,Seong Yeon Won,Kwang Yuk Kim 한국소성가공학회 2010 기타자료 Vol.2010 No.6
The localized necking under non-proportional strain paths was investigated using M-K theory and finite element analyses. The strain paths were calculated from finite element simulations and used for input data in the prediction of necking with M-K model and Yld2000-2d yield function. For the verification, square cup drawing tests with a ferritic stainless steel sheet were carried out numerically and experimentally. The predicted results showed good agreement with experiments.
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Synthesis and Evaluation of Benzoquinolinone Derivatives as SARS-CoV 3CL Protease Inhibitors
Ahn, Tae-Young,Kuo, Chih-Jung,Liu, Hun-Ge,Ha, Deok-Chan,Liang, Po-Huang,Jung, Young-Sik Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.1
For the discovery of new antivirals against Severe Acute Respiratory Syndrome-coronavirus (SARS-CoV), we prepared and evaluated several benzoquinoline compounds as its 3C-like protease (3CLpro) inhibitors. Based on the computer modeling study that each of the two rigid benzoquinolinone and N-phenoltetrazole moieties of the compound 1 is bound to the S1 and S2 sites, respectively, of the SARS protease by forming H-bonds and hydrophobic interactions, we designed and synthesized alkylated benzoquinolines at both the sites of the hydroxyl groups. We found that the compound 2a showed five times higher inhibiting activity against the 3CLpro compared to the compound 1.
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Ahn, Do Young,Lee, Deok Yeon,Shin, Chan Yong,Bui, Hoa Thi,Shrestha, Nabeen K.,Giebeler, Lars,Noh, Yong-Young,Han, Sung-Hwan American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.15
<P>This work reports on designing of first successful MOFsensitizer based solid-state photovoltaic device, perticularly with a meaningful output power conversion efficiency. In this study, an intrinsically conductive cobalt-based MOFs (Co-DAPV) formed by the coordination between Co (II) ions and a redox active di(3-diaminopropyl)-viologen (i.e., DAPV) ligand is investigated as sensitizer. Hall-effect measurement shows p-type conductivity of the Co-DAPV film with hole mobility of 0.017 cm(2) V-1 s(-1), suggesting its potential application as hole transporting sensitizer. Further, the energy levels of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) of Co-DAPV are well-matched to be suitably employed for sensitizing TiO2. Thus, by layer-by-layer deposition of hole conducting MOF-sensitizer onto mesoporous TiO2 film, a power conversion efficiency of as high as 2.1% is achieved, which exceeds the highest efficiency values of MOF-sensitized liquid-junction solar cells reported so far.</P>
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Sung-Chan Gwark,Shin Hwang,Ki-Hun Kim,Yong-Joo Lee,Kwang-Min Park,Chul-Soo Ahn,Deok-Bog Moon,Tae-Yong Ha,Gi-Won Song,Dong-Hwan Jung,Gil-Chun Park,Sung-Gyu Lee 한국간담췌외과학회 2012 한국간담췌외과학회지 Vol.16 No.4
Backgrounds/Aims: Gallbladder carcinoma (GBCa) T2 lesions are considered to be advanced tumors showing diverse features in tumor extent. When this T2 lesion does not involve the cystic duct and there is no evidence of lymph node metastasis, we have to consider what is the most reasonable extent of resection - that is, whether to perform concurrent extra-hepatic bile duct resection (EHBD) resection or not. This study intends to evaluate the adequacy of EHBD resection in patients undergoing resection for T2N0 GBCa. Methods: From our institutional database of GBCa, 48 cases of T2N0 GBCa who underwent R0 resection during November 1995 and August 2008 were selected. Patients who underwent prior laparoscopic cholecystectomy were excluded. Their medical records were reviewed retrospectively. Results: Their mean age was 63.2±83.3 years and females were 25. The mean serum CA19-9 level was 37.3±89.3 ng/ml. The extents of liver resection were wedge resection (n=36) and segment 4a+5 resection (n=12). Concurrent EHBD resection was performed in 16 (33.3%) patients. No fatal surgical complication occurred. The majority of tumor pathology was adenocarcinoma (n=42), with additional unusual types as papillary (n=3), saromatoid (n=1), signet ring cell (n=1) and adenosquamous (n=1) cancers. The overall survival rate was 87.1% at 1 year, 69.5% at 3 years and 61.7% at 5 years. After exclusion of mortalities not related to cancer, the overall patient survival rate was 89.6% at 1 year, 72.9% at 3 years and 64.7% at 5 years, with 3-year survival rates of 72% in the EHBD resection group and 69.2% in the non-resection group (p=0.661). Conclusions: The results of this study indicate that concurrent EHBD resection did not improve patient survival when R0 resection was achieved in patients with T2N0 GBCa. Therefore, routine EHBD resection may not be indicated for T2N0 GBCa unless the tumor is close to the cystic duct. (Korean J Hepatobiliary Pancreat Surg 2012;16:142-146)
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강덕홍(Deok-Hong Kang),안예찬(Yeh-Chan Ahn),김종록(Jong-Rok Kim),오병도(Byung Do Oh),김무환(Moo Hwan Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The transient nature and complex flow geometries of two-phase gas-liquid flows cause fundamental difficulties when measuring flow velocity using an electromagnetic flowmeter. Recently, a current-sensing flowmeter was introduced to obtain measurements with high temporal resolution (Ahn et al.). In this study, current-sensing flowmeter theory was applied to measure the fast velocity transients in slug flows. To do this, the velocity fields of axisymmetric gas-liquid slug flow in a vertical pipe were obtained using Volume-of-Fluid (VOF) method and the virtual potential distributions for the electrodes of finite size were also computed using the finite volume method for the simulated slug flow. The output signal prediction for slug flow was carried out from the velocity and virtual potential (or weight function) fields. The flowmeter was numerically calibrated to obtain the cross-sectional liquid mean velocity at an electrode plane from the predicted output signal. Two calibration parameters are required for this procedure: a flow pattern coefficient and a localization parameter. The flow pattern coefficient was defined by the ratio of the liquid resistance between the electrodes for two-phase flow with respect to that for single-phase flow, and the localization parameter was introduced to avoid errors in the flowmeter readings caused by liquid acceleration or deceleration around the electrodes. These parameters were also calculated from the computed velocity and virtual potential fields. The results can be used to obtain the liquid mean velocity from the slug flow signal measured by a current-sensing flowmeter.
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