전기전도도법에 의한 18-Crown-6와 알칼리 금속 이온 착화물의 안정도에 관한 연구

심재후,정광보 東國大學校 1988 論文集 Vol.27 No.-

The stability constants(K) for the l : 1 complexes of 18-crown-6 (18C6) with alkali metal ions in DMSO(dimethylsulfoxide), DMF(N, N-dimethylformamide) and AN(acetonitrile) were determined at 30℃ by conductometry. The stability constant sequences of the alkali metal ions complexes with 18C6 in DMSO were K^+>Rb^+>Cs^+>Na^+>Li^+ and in DMF and AN, they were K^+>Na^+>Cs^+>Rb^+>Li^+ . The K values for the fixed alkali metal ion in these polar aprotic solvents were given in the order of DMSO<DMF<AN. These results revealed that the important factors affecting on the process of the formation of the 18C6 complexes with alkali metal ions were the relative size of ionic diameter, cavity of 18-crown-6 and the donor number of polar aprotic organic solvents.

분무 열분해에 의한 Ba1-xSrxFe12O19계 자성 미립자의 제조 및 특성 변화

김동현,김광만,김경남,최세영,심인보,이용근 大韓齒科器材學會 2004 대한치과재료학회지 Vol.31 No.1

Magnetic particles with alternating magnetic field are expected to be useful as thermoseeds in hyperthermic cancer treatment, since they can be targeted and confined to the cancer site. Hard magnetic ferrites such as barium ferrite and strontium ferrite are good candidates for thermoseeds of hyperthermia because of their great hysteresis loss. In order to verify the effect of Sr-substitution to Ba-site, synthesized Ba1-xSrxFe12O19 microspheres with various compositions through spray pyrolysis followed by sol synthesis using barium nitrate, strontium acetate and iron nitrate. Coercive force was increased with increasing substitution amount of Sr whereas magnetic saturation was almost constant. Spherical microspheres with average diameter of 11.7~17.0 ㎛ were produced by spray pyrolysis at 400~1000℃. The mean size was dependent on the pyrolysis temperature and flow rate of carrier gas. In order to obtain a single phase of SrFe12O19 crystal, the spray pyrolyzed spheres were undertaken subsequent heat-treatment above 1000℃. During the subsequent heat-treatment, however, spherical microspheres were agglomerated because of necking between particles. Further study has to be continued working on synthesis of pure SrFe12O19 crystal by means of improvement of pyrolysis temperature scheme and extend the heating period.

Cementitiuous materials for crack self-healing concrete

Kwang Bo Shim 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.S1

The serviceability and durability of concrete structures has been extensively studied by various researchers. Cementitious materials and concrete are the most widely used in construction site. However, cracking is a well-known phenomenon in concrete engineering. Concrete repairs are inevitable to enhance its service life which evokes additional expenditure separate to the building cost. Therefore, one of the most important issues is to seal cracks which occur due to drying shrinkage or exposed to external factors. Many researchers have already studied this topic with the intent to control cracking or develop a crack-free concrete. Two alternatives for crack control have been proposed; these include methodologies for either controlling residual stresses or developing ductile concrete. Recently, a lot of researchers are studied various crack control methods and concepts to achieve self-healing phenomenon in past decades. In this review paper, autogenous healing in cementitious materials is reported based on various articles, activity of JCI TC-075B (Japan Concrete Institute Technical Committee 075B), JCI TC-091A (Japan Concrete Institute Technical Committee 091A) and RILEM TC-SHC (Self-healing Phenomena in Cement Based Materials of (International Union of Laboratories and Experts in Construction Materials,Systems and Structures)).

Application of Continuous Hemofiltration (CHF) to Critically Ill Surgical Patients

Kwang Bo Kwun,Hee Won Ham,Min Chul Shim,Bo Yang Suh,Sung Hoon Kim Korean Society of Critical Care Medicine 1986 Acute and Critical Care Vol.1 No.1

Continuous hemofiltration (CHF) is an extracorporeal process in which fluid electrolytes and other lower molecular weight substances are removed from the patient by ultrafiltration over an extended period. There are several kind of small handy commercially available hemofilters. This device requires only a small amount of blood flow rate (20-70 ml/min) for effective hemofiltration so we applied CHF for various patients who needed dialysis but whose clinical condition precluded either hemodialysis or peritoneal dialysis. 8 patients were treated. 6 were extremely unstable hemodynamically (mean BP around 60mmHg) and 4 were not indicated for peritoneal dialysis because of abdominal pathologies. Angioaccess was by percutaneous needle puncture artery and venous catheterization or Scribner shunt. Average duration of CHF was 55 hours ranging 24-96 hours. Hemofiltration rate were about 3-12 ml/min. Chemical composition of filtrate was same as plasma except very low protein and protein-bound substances. Removal of urea was 5-17 Gms/24hrs. Fluid loss from CHF was replaced by volume to volume. For 4 patients with massive fluid overload volume replacement was restricted to none to I/2 of this filtrates, ln these 4 patients, average about 2,000ml/24hrs of negative fluid balances were achieved without significant hemodynamic alteration. CHF is a simple, safe and effective treatment for acute renal failure and volume overloaded patients who are not indicated for either hemodialysis or peritoneal dialysis due to their conditions.

유한요소법을 이용한 박판 맞대기 용접부 잔류응력 및 균열 해석

심광보(Kwang-Bo Shim),배홍열(Hong-Yeol Bae),전준영(Jun-Young Jeon),송태광(Tae-Kwang Song),김윤재(Yun-Jae Kim) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.5

본 논문은 박판 맞대기 용접부 잔류응력을 3 차원 유한 요소법을 이용해서 모사하였다. 경계조건이 잔류응력에 미치는 영향을 연구하기 위해 다양한 경계조건이 고려되었으며, 예측된 용접 잔류응력은 기존 문헌의 내용과 비교 검증하였으며, 본 연구의 결과는 박판 용접부 균열에 발생하는 잔류응력의 영향을 해석하는데 사용될 것이다. In this study, we calculate the welding residual stresses for a butt-welded thin-walled plate by carrying out threedimensional finite-element analyses. To study the effect of mechanical boundary conditions on the welding residual stresses, various boundary conditions are considered. The welding residual stresses obtained in the measurements and finite-element analyses are validated by comparing them with the welding residual stress profiles in the R6 code. The results of this study are used to analyze the influence of residual stress on the crack formation in thin-section weldments.

Production of Monoclonal Antibody Against Listeria monocytogenes and Its Application to Immunochromatography Strip Test

( Won Bo Shim ),( Jin Gil Choi ),( Ji Young Kim ),( Zheng You Yang ),( Kyu Ho Lee ),( Min Gon Kim ),( Sang Do Ha ),( Keun Sung Kim ),( Kwang Yup Kim ),( Cheol Ho Kim ),( Kwang Soo Ha ),( Sergei A. Ere 한국미생물생명공학회 2007 Journal of microbiology and biotechnology Vol.17 No.7

유한요소법을 이용한 박판 맞대기 용접부 잔류응력 해석

심광보(Kwang-Bo Shim),배홍열(Hong-Yeol Bae),전준영(Jun-Young Jeon),송태광(Tae-Kwang Song),김윤재(Yun-Jae Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11

In this paper, welding residual stresses for butt weld of thin-walled plate are calculated based on 3-dimensional finite element analyses. To study the effect of mechanical boundary condition on welding residual stresses, various boundary conditions are considered. Predicted welding residual stresses are validated existing results of measurements and finite element analyses and compared with welding residual stress profile in the R6 code. The results of this work are expected to be used in assessment of the crack in weldment.

A Study on Image Quality and Dose Comparison of Abdominal CT with Deep Learning Iterative Reconstruction Method and Model-Based Iterative Reconstruction Method

심현보(Hyeon-Bo Shim)이광현(Kwang-Hyun Lee),김령희(Ryeon-Hee Kim),박순규(Soon-Kyoo Park),심지나(Ji-Na Shim) 대한CT영상기술학회 2021 대한CT영상기술학회지 Vol.23 No.1

기존 반복적 재구성법의 단점을 보안하고 보다 낮은 선량으로 좋은 질의 영상을 얻기 위해 인공 신경망(Artificial Neural Network)으로 학습시킨 딥러닝 반복적 재구성법(Deep Learning Iterative Reconstruction, DLIR)이 개발되었으며 복부 CT에서 GE사의 딥러닝 반복적 재구성법(True Fidelity, TF)과 Siemens사의 모델기반 반복적 재구성법(Advanced Modeled Iterative Reconstruction, ADMIRE)을 적용한 영상의 화질평가와 선량감소 효과를 비교해 보고자 하였다. Phantom study는 CTDIvol(mGy)을 9.5로 동일하게 설정한 TF(TF-L, TF-M, TH-H)와 ADMIRE(1,2,3,4,5)이 적용된 단면영상으로 복부(A), 뼈(B) ROI를 설정하였고, Patient study는 본원에서 검사를 시행한 환자 30명의 복부조영 CT 검사에서 TF(TF-M, TF-H), ADMIRE 2 적용된 단면영상으로 복부대동맥(A), 간실질(B), 근육(C), 백그라운드(D) ROI를 설정하여 HU 및 SD값을 측정하고 SNR, CNR을 비교 평가하였다. Phantom study에서 T F-M은 ADMIRE 1, 3, 5 보다 Noise는 ROI A에서 221%, 139%, 40%, B는 104%, 66%, 19% 낮았고,(p<0.05) SNR은 ROI A에서 70%, 59%, 33%, B는 53%, 42%, 19% 높았다.(p<0.05) Patient study에서 TF-M은 ADMIRE 2 보다 Noise는 ROI A에서 7% 낮았지만 통계적으로 유의하지 않았고,(p=0.28) B는 21%, C는 45% 낮았다.(p<0.05) SNR은 ROI A에서 동일하였지만 통계적으로 유의하지않았고,(p=0.70) B는 20%, C는 28% 높았다.(p<0.05) CNR은 ROI A에서 22%, B는 25%, C는 22% 높았다.(p<0.05) 선량평가에서 TF가 적용된 환자의 평균 CTDIvol(mGy)은 4.73 ± 1.28, DLP(mGy⋅cm)는 281.43 ± 79.22, ADMIRE가 적용된 환자의 평균 CTDIvol(mGy)은 6.06 ± 1.22, DLP(mGy⋅cm)는 343.3 ± 81.34 이였고,(p<0.05) TF가 ADMIRE가 적용된 환자보다 CTDIvol(mGy)은 28%, DLP(mGy⋅cm)는 21% 낮았음을 알 수 있다.(p<0.05) 복부 CT 검사에서 딥러닝 반복적 재구성법이 적용된 TF 영상이모델기반 반복적 재구성법이 적용된 ADMIRE 영상보다 HU값의 변화는 없지만, Noise가 감소하며 SNR과 CNR은 증가하는 것으로 나타났다. 또한 선량이 같다면 딥러닝 반복적 재구성법이 적용된 TF 영상이 모델기반 반복적 재구성법이 적용된 ADMIRE영상보다 화질이 향상되고 이는 다시 말해 환자의 피폭 선량을 저감하는데 큰 기여를 한다고 할 수 있다 Deep Learning Iterative Reconstruction (DLIR), which was trained with an artificial neural network, was developed to secure the shortcomings of the traditional iterative reconstruction method and obtain a good quality image at a lower dose. The purpose of this study was to compare the effects of dose reduction and image quality evaluation using deep learning iterative reconstruction (True Fidelity; TF) and Siemens Advanced Modeled Iterative Reconstruction (ADMIRE). Phantom study is a axial image with TF (TF-L, TF-M, TH-H) a nd ADMIRE (1,2,3,4,5) with CTDIvol (mGy) set e qual to 9.5. Abdomen (A), Bone (B) ROI w as set, and the patient study was a axial image applied with TF (TF-M, TF-H) and ADMIRE 2 in the abdominal contrast CT scan of 30 patients who performed the examination in our hospital. Abdomen aorta (A), Hepatic parenchyma (B), muscle (C), background (D) ROI w as s et to measure HU, SD values, a nd SNR , CNR were compared. In t he P hantom study, TF-M w as c ompared with ADMIRE 1, 3, 5. Noise was 221%, 139%, 40% lower in ROI A, 104%, 66%, 19% lower in B.(p<0.05) SNR was 70%, 59%, 33% higher in ROI A, 53, 42%, 19% higher in B.(p<0.05) In patient study, TF-M was compared with ADMIRE 2. Noise was 7% lower in ROI A but it was not statistically significant.(p=0.28) B was 21%, C was 45% lower.(p<0.05) SNR was the same in ROI A but not statistically significant.(p=0.70) B was 20%, C was 28% higher.(p<0.05) CNR was ROI A 22%, B 25%, C 22% higher.(p<0.05) In dose assessment, the average CTDIvol (mGy) of patients with TF applied was 4.73 ± 1.28, DLP (mGy cm) was 281.43 ± 79.22, and the average CTDIvol (mGy) of patients with ADMIRE was 6.06 ± 1.22, DLP (mGy cm) was 343.3 ± 81.34.(p<0.05) It can be seen that TF was lower in CTDIvol (mGy) by 28% and DLP (mGy cm) by 21% than in patients with ADMIRE.(p<0.05) In conclusion, TF images on abdominal CT showed no change in HU values than ADMIRE images, but Noise decreased and SNR and CNR increased. If the dose is the same, the TF image is applied has better image quality than the ADMIRE image. It can be said that it contributes significantly to reducing the patient s exposure dose.

Evaluation of the transfer rate of ochratoxin a to decoctions of herbal medicines

Shim, Won-Bo,Ha, Kwang-Soo,Kim, Min-Gon,Kim, Jeong-Sook,Chung, Duck-Hwa Springer-Verlag 2014 Food Science and Biotechnology Vol.23 No.6

Von Recklinghausen씨 병에 병발한 악성 신경초종 : Case Report

심성보,전용문,김광명,옥영철,이규웅 대한신경외과학회 1976 Journal of Korean neurosurgical society Vol.5 No.1

Malignant peripheral nerve tumors are very rare and derived from the neurofibromatosis in about 13%. There are two classes of malignant tumors in the peripheral nerves, one those of mesoblastic origin, is far most common and made up of malignant neurofibroma and much common fibrosarcoma, and metastasis in 20% of fibrosarcoma, and the other is neuroepithelial origin. These are characterized by increased cellularity, atypical from of cells, mitoses and invasiveness. The choice treatment is radical removal of the tumor, and not affected the prognosis by radiation or chemotherapy. We have been recently experienced of one case of malignant schwannoma on the cervical roots in a case of von Recklinhausen's disease.