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건물군 인벤토리가 고려된 다차원법을 활용한 홍수피해액 산정
이석호,이석호,김길호,김병식 한국방재학회 2018 한국방재학회논문집 Vol.18 No.7
As a result of recent climate change, flood damage originating from local floods and typhoons has become more frequent, costing many lives and damaging property. Especially in city centers, a large amount of damage can occur due to inundation caused by river flooding. In this study, flood damage area was calculated using the Flo-2D flood inundation model, and the estimated flood damage was calculated using multi-dimensional flood damage analysis. In general, the flood damage rate can be calculated using the area ratio according to the land use in the affected administrative district. However, in this study the flood damage rate was calculated using the flood damage rate proposed in the multi-dimensional flood damage analysis. The estimated flood damage as a function of return period were estimated using the estimated flood damage rate. The flood damage rate estimated using the area ratio was estimated to be at least 51% with a maximum 75% lower than the flood damage rate estimated using the building group, and the total damage was underestimated when the area ratio was used. Therefore, it is necessary to estimate damages using building inventories presented in the multidimensional law for residential and industrial areas. 최근 기후변화로 인해 국지성 집중호우 및 태풍으로 제내지 침수로 인한 홍수피해가 빈번하게 발생하고 있으며, 많은 인명피해와 재산피해가 발생하고 있다. 특히 도심지에서 하천의 범람으로 인한 침수로 많은 피해액이 발생하게 된다. 따라서 본 연구에서는 도심을 흐르는 도시하천인 원주천유역을 대상으로 홍수범람모형인 Flo-2D모형을 이용하여 홍수피해면적을 산정하였으며 다차원법을 이용한 피해액 산정방법을 통하여 빈도별 예상홍수피해액을 산정하였다. 일반적으로 행정구역상 토지이용에 따른 면적비를 이용하여 침수편입률을 산정하나 본 연구에서는 다차원법에서 제시하는 침수편입률 산정방법을 이용하여 산정하였다. 산정 결과 면적비를 이용한 편입률이 건물군을 이용한 편입률 보다 최소 51%, 최대 75% 낮게 산정되었으며 면적비를 이용하였을 때 과소 산정되는 것으로 나타났다. 따라서 다차원법을 이용한 피해액 분석시 주거, 산업의 경우 다차원법에서 제시되고 있는 건물군을 이용하여 피해액을 산정하는 것이 필요하다고 판단된다.
루프형 2상 유동 열사이폰의 유동 불안정에 관한 실험적 연구
이석호 대한설비공학회 2002 설비공학 논문집 Vol.14 No.5
The instability of two-phase loop thermosyphons (TLTs) was investigated experimentally. Three orifice type inserts were used to study the effect of change in the pressure drop in the flow channel of the TLT on the flow instability and temperature fluctuation. It is observed that a decrease in the size of the orifice insert from 3.7mm (no insert) to 0.71mm drastically reduced the fluctuation of the temperature, especially at the evaporator section of the TLT With the orifice type insert of 0.71 mm for the TLT, the overall temperature fluctuation was almost completely eliminated, especially at higher power input to the TLT.
PTMSP-Borosilicate 복합막에 의한 수소-질소 기체 분리에 관한 연구
이석호,강태범,Lee, Suk Ho,Kang, Tae Beom 한국막학회 2014 멤브레인 Vol.24 No.6
무정형의 괴상의 다공성 borosilicate는 trimethylborate (TMB)/ tetraethylorthosilicate (TEOS) 몰비 0.01~0.10 겔체를 $700{\sim}800^{\circ}C$ 온도범위에서 열처리 하였을 때 얻어졌다. BET와 SEM 관찰에 의하면 $700{\sim}800^{\circ}C$에서 얻어진 borosilicate의 표면적은 $251.12{\sim}355.62m^2/g$이고, 기공직경은 3.5~4.9 nm이며, 입자크기는 30~60 nm이었다. TGA측정에 의하면 borosilicate가 poly[1-(trimethylsilyl)propyne](PTMSP)에 첨가되었을 때 PTMSP-borosilicate 복합막의 열적 안정성은 향상 되었다. SEM관찰에 의하면 borosilicate는 $1{\mu}m$ 크기로 복합막 내에 분산되어 있었다. 기체투과실험에 의하면 PTMSP에 borosilicate 함량이 증가하면 자유부피, 공동, 기공률이 증가하여 기체투과가 용해확산에 의한 것보다 분자체거름, 표면확산, Knudsen 확산에 의해 일어나는 경우가 점차 증가함으로 해서 $H_2$와 $N_2$의 투과도는 증가하고 선택도($H_2/N_2$)는 감소하였다. The amorphous and porous borosilicate without any cracks was obtained under the following condition : 0.01~ 0.10 mole ratio of trimethylborate (TMB)/ tetraethylorthosilicate (TEOS) and the temperature of $700{\sim}800^{\circ}C$. According to the BET and SEM measurements, borosilicate heat-treated in between 700 and $800^{\circ}C$ showed the surface area of $251.12{\sim}355.62m^2/g$, the pore diameter of 3.5~4.9 nm, and the particle size of 30~60 nm. According to the TGA measurements, the thermal stability of poly[1-(trimethylsilyl)propyne](PTMSP) membrane was enhanced by inserting borosilicate. SEM observation showed that the size of dispersed borosilicate in the composite membrane was $1{\mu}m$. The results showed that the permeability of $H_2$ and $N_2$ increased and the selectivity of $H_2/N_2$ decreased upon the addition of borosilicate into PTMSP membranes. Addition of borosilicate may possibly increase the free volume, cavity and porosity of membranes indicating that permeation occurred by molecular sieving, surface and Knudsen diffusion rather than solution diffusion of gases.
이석호,이성현,이규찬,박연호,김건국,이정남,구양서,심선진,신동복,김정호,정동해,김연석 한국간담췌외과학회 2010 한국간담췌외과학회지 Vol.14 No.3
Purpose: To evaluate treatment outcomes for patients with stage II/III pancreatic cancer who are treated with radiation therapy (RT) with or without chemotherapy (CTx) following surgery. Methods: We retrospectively analyzed data from 17 patients who underwent surgery and post-operative RT with or without CTx between January 2000 and December 2008. Seven patients (41%) had stage II cancer and 10 (59%) had stage III cancer. Most were male (13 of 17; 76.5%). Age at diagnosis ranged from 42 to 82 (median 69) years. Whipple's operation was done in 9 patients (53%), distal pancreatectomy in 7 (41%), and subtotal pancreatectomy in 1 (6%). All patients received RT using a three-dimensional RT technique to spare critical normal structures. Median radiation dose was 54 Gy (range, 50.4∼55.8 Gy). Variable CTx regimens were combined in 10 patients (58.8%); 5-FU in 4, UFTE-G in 4, gemcitabine in 1, and xeloda in 1. Acute toxicity was evaluated according to RTOG toxicity criteria. Survival analysis was done using the Kaplan-Meyer method. Univariate and multivariate prognostic factor analysis were done, respectively, using a log-rank test and Cox's proportional hazards model. Results: The median follow-up period was 12.6 months. Locoregional and distant failures occurred in 8 (47.1%) and 8 patients (47.1%), respectively. Five patients (29.4%) developed both loco-regional recurrence and distant metastasis. The metastatic sites were liver in 4 patients, lung in 3, peritoneum in 1, and kidney in 1. Median overall survival (OS) was 12.6 months. The 1- and 2-year OS rates were, respectively, 58.8% and 24.5%. Median disease-free survival (DFS) was 8.3 months and the 1- and 2-year DFS rates were 46.3% and 30.9%, respectively. The 2-year OS was not different between RT and RT with CTx : survival rates were 28.6% and 17.5%, respectively (p=0.764). T stage and a postoperative CA 19-9 level of ≥180 U/ml were significant prognostic factors for OS in both univariate and multivariate analysis: the 2-year OS for T3 and T4 were 34.1% and 16.7%, respectively (p=0.0022), the 2-year OS for <180 and ≥180 U/ml were 32.5% and 0%, respectively (p=0.0142) Acute toxicities were RTOG grade 1 (G1) nausea in 1 patient (5.9%), G1 vomiting in 2 (11.8%), and G1-2 enteritis in 5 (29.4%). The hematologic toxicities were G1 leukopenia in 5 patients (29.4%), G2 leukopenia 1 (5.9%), G1 thrombocytopenia in 1 (5.9%), and G1∼2 anemia in 6 (35.3%). Conclusion: Survival results of the present study are comparable to those in other reports with acceptable toxicity. Significant prognostic factors for overall survival in pancreatic cancer are tumor stage and postoperative CA 19-9 level.
간암의 술전 검사로서 CT AP , CT HA 및 Lipiodol CT 의 유용성
이석호,이규택,김재준,김승훈,백승운,이종균,이준혁,고광철,이풍렬,이종철,최규완,도영수 대한소화기학회 1999 대한소화기학회지 Vol.32 No.6
Background/Aims: Computed tomography during arterial portography (CTAP), computed tomo-graphy during hepatic arteriography (CTHA) and Lipiodol CT are highly sensitive methods to detec intrahepatic tumor. Their sensitivity and accuracy are over 90% and 85%, respectively. We evaluated the usefulness of CTAP, CTHA and Lipiodol CT as a preoperative examination. Methods: For eighty two patients with hepatocellular carcinoma which were considered as the resectable on spiral CT and angiogram, CTAP and CTHA were performed. The additional nodules on CTAP and CTHA were confirmed by Lipiodol CT. Results: CTAP and CTHA could find additional nodules in 28% of the patients. The treatment plan was changed from surgical to nonsurgical method in 12% of the patients The larger tumor nodules were on the spiral CT, the more additional tumor nodules were found on CTAP and CTHA (p=0.03). The probability of finding additional nodules on CTAP and CTHA is no related with the counts of tumor nodules on the spiral CT (p=0.84). CTAP and CTHA could find additional nodules in 6 cases of 27 cases who underwent Lipiodol CT. The treatment plan was changed to nonsurgical treatment in 3 cases by the results of CTAP and CTHA. Conculusions: We concluded that CTAP, CTHA and Lipiodol CT are useful in avoiding unnecessory operation.