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협조적 게임에 의한 송전요금체계: 국내 전력시장을 사례로
장일수 재단법인 에너지경제연구원 2015 에너지경제연구 Vol.14 No.3
This article modeles Korean power transmission system, and calculates transmission fees by using Aumann-Shapley method and compares them with the current transmission fee. To analyze the effect of a new transmission line on the whole transmission fees, Miryang high-voltage transmission line and other two related lines are added in the model. The results show that the Aumann-Shapley method does well in providing rational economic signals in making transmission fee policies, and also provides good explanations of the impact of added transmission lines on the transmission fees. 이 논문에서는 국내 전력산업에서의 전력계통을 모형화하고 협조적 게임의 해인 Aumann-Shapley 밸류로 발전 측과 부하 측의 송전요금을 산정하여 현재 시행하고 있는 국내 송전이용요금체계와 비교・분석하였다. 또한 최근 이슈화되고 있는 송전선로 건설이 송전요금에 주는 영향을 관찰하기 위하여 밀양송전탑 및 관련된 기타 송전선로를 추가한 후 송전요금의 변화도 관찰하였다. 이로써 협조적 게임의 해인 Aumann-Shapley 밸류는 발전 및 부하 측 송전요금의 책정에서 경제적 신호를 잘 제공하고 있다는 것을 보여 주었다. 또한 협조적 게임을 사용하면 송전선로의 추가 건설이 각 지역의 송전요금에 어떠한 영향을 주는지에 대해서도 합리적인 설명이 가능하다는 것을 보여주었다.
장일수,박상우,황대용,성무경,조희경,윤소영,조요한,최원혁 대한영상의학회 2011 Korean Journal of Radiology Vol.12 No.1
Objective: We wanted to evaluate the effi cacy of stent placement using the coaxial technique with a stiff, long introducer sheath in patients with technical failure using an angiographic catheter for the obstructions proximal to the descending colon. Materials and Methods: Self-expandable metallic stent placement was attempted under fluoroscopy-guidance in 77 consecutive patients who had malignant colorectal obstruction. Stent placement was performed using an angiographic catheter and a guide wire. If the angiographic catheter could not be advanced over the guide wire into the obstructive lesions proximal to the descending colon, then a 6-Fr introducer sheath was used. The technical success rate, the clinical success rate and the complications were analyzed. Results: Successful stent placement was achieved in 75 of 77 patients (97%). The angiographic catheter failed to advance into the obstructive lesions of 11 patients (M:F = 7:4; mean age, 65.5 years) whose lesions were at the level of the splenic fl exure or transverse colon. Therefore, the coaxial technique was implemented in all these 11 patients using a 6-Fr stiff introducer sheath and then the stent placement was successful. There were no complications related to the use of a stiff introducer sheath. Clinical success, which was defined as relief of clinical obstructive bowel symptoms, was obtained within 24 hours in all of patients. Conclusion: The coaxial technique using a stiff introducer sheath can increase the technical success of fl uoroscopy-guided, self-expandable metallic stent placement in patients with colonic obstruction proximal to the descending colon. Objective: We wanted to evaluate the effi cacy of stent placement using the coaxial technique with a stiff, long introducer sheath in patients with technical failure using an angiographic catheter for the obstructions proximal to the descending colon. Materials and Methods: Self-expandable metallic stent placement was attempted under fluoroscopy-guidance in 77 consecutive patients who had malignant colorectal obstruction. Stent placement was performed using an angiographic catheter and a guide wire. If the angiographic catheter could not be advanced over the guide wire into the obstructive lesions proximal to the descending colon, then a 6-Fr introducer sheath was used. The technical success rate, the clinical success rate and the complications were analyzed. Results: Successful stent placement was achieved in 75 of 77 patients (97%). The angiographic catheter failed to advance into the obstructive lesions of 11 patients (M:F = 7:4; mean age, 65.5 years) whose lesions were at the level of the splenic fl exure or transverse colon. Therefore, the coaxial technique was implemented in all these 11 patients using a 6-Fr stiff introducer sheath and then the stent placement was successful. There were no complications related to the use of a stiff introducer sheath. Clinical success, which was defined as relief of clinical obstructive bowel symptoms, was obtained within 24 hours in all of patients. Conclusion: The coaxial technique using a stiff introducer sheath can increase the technical success of fl uoroscopy-guided, self-expandable metallic stent placement in patients with colonic obstruction proximal to the descending colon.
장일수,지현근,박상우,윤익진,황재준,이송암,김준석,장성환,정홍근 대한영상의학회 2011 Korean Journal of Radiology Vol.12 No.2
Objective: We wanted to evaluate the status of self-expandable nitinol stents implanted in the P2 and P3 segments of the popliteal artery in Korean patients. Materials and Methods: We retrospectively analyzed 189 consecutive patients who underwent endovascular treatment for stenoocclusive lesions in the femoropopliteal artery from July 2003 to March 2009, and 18 patients who underwent stent placement in popliteal arterial P2 and P3 segments were fi nally enrolled. Lesion patency was evaluated by ultrasound or CT angiography, and stent fracture was assessed by plain X-rays at 1, 3, 6 and 12 months and annually thereafter. Results: At the 1-month follow-up, stent fracture (Type 2) was seen in one limb (up to P3, 1 of 18, 6%) and it was identifi ed in seven limbs at the 3-month follow-up (Type 2, Type 3, Type 4) (n = 1: up to P2; n = 6: P3). At the 6-month follow-up, one more fracture (Type 1) (up to P3) was noted. At the 1-year follow-up, there were no additional stent fractures. Just four limbs (up to P2) at the 2-year follow-up did not have stent fracture. The primary patency was 94%, 61% and 44% at 1, 3 and 6 months, respectively, and the group with stent implantation up to P3 had a higher fracture rate than that of the group that underwent stenting up to P2 (p < 0.05). Conclusion: We suggest that stent placement up to the popliteal arterial P3 segment and over P2 in an Asian population can worsen the stent patency owing to stent fracture. It may be necessary to develop a stent design and structure for the Asian population that can resist the bending force in the knee joint.
장일수,박상우,권소영,최원혁,천영국,심찬섭,이태윤,김정한 대한영상의학회 2016 Korean Journal of Radiology Vol.17 No.2
Objective: To evaluate the efficacy and safety of balloon-occluded retrograde transvenous obliteration (BRTO) with sodium tetradecyl sulfate (STS) liquid sclerotherapy of gastric varices. Materials and Methods: Between February 2012 and August 2014, STS liquid sclerotherapy was performed in 17 consecutive patients (male:female = 8:9; mean age 58.6 years, range 44–86 years) with gastric varices. Retrograde venography was performed after occlusion of the gastrorenal shunt using a balloon catheter and embolization of collateral draining veins using coils or gelfoam pledgets, to evaluate the anatomy of the gastric varices. We prepared 2% liquid STS by mixing 3% STS and contrast media in a ratio of 2:1. A 2% STS solution was injected into the gastric varices until minimal filling of the afferent portal vein branch was observed (mean 19.9 mL, range 6–33 mL). Patients were followed up using computed tomography (CT) or endoscopy. Results: Technical success was achieved in 16 of 17 patients (94.1%). The procedure failed in one patient because the shunt could not be occluded due to the large diameter of gastrorenal shunt. Complete obliteration of gastric varices was observed in 15 of 16 patients (93.8%) with follow-up CT or endoscopy. There was no rebleeding after the procedure. There was no procedure-related mortality. Conclusion: BRTO using STS liquid can be a safe and useful treatment option in patients with gastric varices.
장일수(Jang Il-Su),두현욱(Doo Hyun-Wook),연효흠(Yeon Hyo-Hum) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
As the China is the biggest fishery country in the world, Chinese fishing vessels survey has been conducted since the beginning of 1950 This study explained Chinese fishing vessels survey system based on the national regulations.