Mechanical mixture of commercial TiO₂ and CeO₂: Thermally induced sulfated CeO₂ by simple calcination for high temperature selective catalytic reduction of NO_x with NH₃

송인학,윤승희,김도희 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1

The selective catalytic reduction (SCR) of nitrogen oxides (NO_x) with NH₃ is among the state of the art technologies that applied to various combustion systems. Although V₂O₅ supported catalysts have been widely used commercially, some disadvantage still remain such as relatively narrow operating window (300~400°C) and the formation of N₂O at high temperature. Recently, CeO₂ based catalysts attracted a lot of research group due to its superior N₂ selectivity and wide temperature window. In this study, commercially available CeO₂ powder and TiO₂ which contains SO₃ (~1.25wt%) species was mechanically mixed by using porcelain mortar followed by simple calcination step. Interestingly, mechanical mixture showed excellent SCR activity and N₂ selectivity in wide temperature range (250~500°C). X-ray diffratction, FT-IR, Temperature programmed reduction technique, SEM and EDS were used to investigate the interaction between TiO₂ and CeO₂ particles. Based on these techniques, we found that thermal treatment induce migration of sulfur species from TiO₂ to CeO₂ region, thereby promoting SCR reaction at high temperature.

악성 늑막 삼출증에서의 비디오 흉강경하 탈크 분무의 효과 및 장점 분석

송인학,김현조,장원호,최창우,손진성,김동현,백강석,염욱 대한흉부외과학회 2007 Journal of Chest Surgery (J Chest Surg) Vol.40 No.7

배경: 악성 늑막 삼출증은 암환자에서 흔히 나타나며 보존적 치료가 일반적인 치료 방법이다. Talc는 화학적 늑막유착술에 이용되는 가장 효과적인 경화제이지만, 투여경로에 대해서는 의견이 분분하다. 본 논문은 비디오 흉강경을 이용한 talc 분무(A군)를 흉관을 통한 전통적인 talc 현탁액 투여(B군)와 비교함으로써 비디오 흉강경을 통한 talc 분무의 장점과 효과를 분석하였다. 대상 및 방법: 2004년 12월부터 2006년 5월까지 악성 늑막 삼출증으로 화학적 늑막 유착술을 시행받은 20명을 대상으로 후향적으로 조사하였으며, 이 중 10명이 전신 마취하에 비디오 흉강경을 통한 talc 분무(A군)를 그리고 10명은 전통적인 talc 현탁액(B군)을 이용한 늑막유착술을 시행 받았다. 결과: 흉관의 평균 거치기간은 7.0±4.0일(A군)과 6.7±3.6일(B군)이었고, 평균 재원 기간은 24.3±9.4일(A군)과 30.7±21.5일(B군)로 유의한 차이는 없었다. 증상도 두 군에서 모두 완화되었고 합병증도 없었다. 그러나 폐의 재팽창은 흉강경을 이용한 군에서 유의하게(p-value=0.011) 우수하였고, 외래 추적 관찰에서 호흡곤란도 흉강경을 이용한 군에서 더 많이 완화되었다(p-value=0.014). 결론: 비디오 흉강경을 통한 talc 분무는 병변을 직접 관찰하면서 흉수를 제거할 수 있고 필요한 경우 동시에 늑막 박피술을 시행할 수 있어 폐의 재팽창이 더 우수하며 이로 인해 호흡곤란도 더 많이 완화되며 늑막의 조직검사를 통한 진단을 할 수 있다는 장점이 있어 악성 흉수가 있는 환자에서 추천할 수 있는 방법이다.

Structure and reactivity of vanadium oxide catalysts supported on Microporous TiO2 for NO reduction with NH3

송인학,윤승희,이황호,이승관,조성준,김도희 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0

There have been a number of researches on the surface structure of atomically dispersed vanadium oxide species on a wide range of metal oxide supports. In most cases, metal oxide environment supporting vanadium oxide is described as 2-dimensional flat surface because the pore size of metal oxide is generally much larger than that of vanadium species. In our previous research, microporous TiO2 with small pore less than 1nm was used as support of vanadium oxide. We found that vanadium oxide confined in microporous structure showed significant enhancement in selective catalytic reduction of NOx compared to conventional mesoporous catalytic system. The purpose of this study is to investigate distinct structure of vanadium oxide in micropore as a function of temperature. We demonstrated that microporous structure could restrain the polymerization of vanadium species to a certain extent, which made one-dimensional polymeric vanadate dominant catalysts.

단일절개 흉강경 수술이 여러 흉부질환 수술에서 안전하게 적용될 수 있는 수술법인가에 대한 연구

송인학,이승진 순천향대학교 순천향의학연구소 2015 Journal of Soonchunhyang Medical Science Vol.21 No.1

Objective: Single-incision thoracoscopic surgery (SITS) is being applied to various thoracic diseases because it produces a smaller surgical scar, and is associated with less pain and loss of sensation compared to the traditional 3-port video-assisted thoracoscopic surgery (VATS). In our previous study, we showed that SITS can be used as a first-line surgical method to treat primary spontaneous pneumothorax. Therefore in this study, we looked into whether SITS can be safely and conveniently applied to other various thoracic diseases. Methods: The subjects for this study those patients who underwent SITS at this hospital for thoracic diseases, who were admitted to this hospital between December 2013 and February 2015. Results: In this study, SITS was attempted in 50 patients with various thoracic diseases. In 46 cases, SITS was successfully performed. However, in the remaining 4 cases were converted to 2-port or 3-port VATS (8%, 4/50). The reasons for conversion to VATS was due to difficulty in approaching the lesion (n=3) and severe pleural adhesion (n=1). Conclusion: We found that SITS is a relatively easy and safe procedure that can be applied to various thoracic diseases. However, the operation may be difficult to perform depending on the location of the lesions or the extent of pleural adhesions. Therefore we recommend SITS in conditions where the lesion is mainly in the upper lobe, such as spontaneous pneumothorax, and in patients with minimal level of pleural adhesions.

흉벽에 발생한 거대 해면상 혈관종: 흉벽에서 드물게 발생하는 양성종양

송인학,이승진,이석열,정진헌 순천향대학교 순천향의학연구소 2018 Journal of Soonchunhyang Medical Science Vol.24 No.2

A 35-year-old female complaining of a painful huge right posterior chest wall mass was admitted. Chest computed tomography showed the pleural invasion of mass and deformed ribs. Suspected diagnosis was hemangioma. Entire mass was removed carefully and pleural biopsy was performed. The operation was finished after bleeding control and chest tube insertion. The mass was diagnosed as a cavernous hemangioma histopathologically. Cavernous hemangioma of chest wall is a rare benign vascular tumor. Surgical operation of hemangioma demands meticulous bleeding control because of risk of hemorrhage.

메시지의 긍정·부정 프레이밍과 시간 프레임에 따른 광고 효과

송인학(Song In-Hak),박세영(Park Sea-Young) 충남대학교 사회과학연구소 2009 사회과학연구 Vol.20 No.3

식도격리수술 후 식도 점액류에 의한 기관압박 1예 보고

이석열,송인학,이승진,박형주,이철세,이길노 대한흉부외과학회 2005 Journal of Chest Surgery (J Chest Surg) Vol.38 No.1

A 43-year-old male was admitted to our hospital complaining of dyspnea and wheezing sound at respiration. He had received esophageal exclusion and esophagogastrostomy due to spontanous esophageal rupture 1-year ago. Chest computed tomography revealed esophageal mucocele like that of mediastinal tumor. Trachea is compressed by esophageal mucocele. The operation was performed by resection of thoracic esophagus through right open thoracotomy. Herein we report a case of a tracheal compression by esophageal mucocele after surgical exclusion of the esophagus. 43세 남자 환자가 호흡곤란과 호흡시 나타나는 천명음을 주소로 내원하였다. 환자는 과거력상 1년전에 식도파열로 인하여 식도격리술과 식도위문합수술을 시행받았다. 흉부 컴퓨터 단층촬영상 기관을 압박하는 식도점액류가 마치 종격동 종양처럼 나타났다. 수술은 우측 개흉술을 통하여 식도를 절제하였다. 저자들은 이를 치험하였기에 보고하는 바이다.

벽측늑막의 활막육종 -1예 보고-

이석열,송인학,이승진,박형주,이철세,이길노 대한흉부외과학회 2005 Journal of Chest Surgery (J Chest Surg) Vol.38 No.6

A 34-year-old male was admitted to our hospital complaining of chest pain. Chest computerized tomography showed pleural effusion and mass in left lower area. After open thoracotomy and mass removal originating from the parietal pleura were done. The mass was pathologically diagnosed as poorly differentiated synovial sarcoma. Synovial sarcoma of the pleura is rare. Herein we report a case of synovial sarcoma of the parietal pleura. 흉통을 주소로 내원한 34세 남자 환자에서 흉부 컴퓨터 단층촬영상 좌측 흉부에 종괴와 흉막수가 발견되었다. 개흉술을 실시하여 벽측늑막에서 기원된 종괴를 제거하였으며 종괴는 저분화 활막육종으로 진단되었다. 벽측늑막에서 기원한 활막육종은 드문 질환으로 저자들은 이를 치험하였기에 보고하는 바이다.

하지정맥류에서 정맥내 980-nm 다이오드 레이저 치료의 단기결과

이석열,송인학,이승진,박형주,이철세,이길노 대한흉부외과학회 2005 Journal of Chest Surgery (J Chest Surg) Vol.38 No.8

Background: Recently 980-nm diode laser endovenous treatment was introduced and used as a method of treatment for varicose vein in lower extremities. The advantages of endovenous laser treatment are good cosmetic effects without incision and avoidance of complications associated with surgery. Therefore, we performed an endovenous laser treatment using a 980-nm diode laser and observed the effects and the efficiency of treatment. Material and Method: From October, 2003 to March, 2004, 56 patients (84 limbs) underwent endovenous laser treatment with a 980-nm diode laser. The effects of treatment, complications and recurrences were reviewed. Result: The mean age of patients was 47.2 years old and the number of men and women were 21 and 35. In a total of 84 limbs, postoperative complications were transient ecchymosis(84 cases), local paresthesia (24 cases), local skin discolorization (6 cases), minimal burn (3 cases), and post operative phlebitis (1 cases). Adjuvant sclerotherapy was performed in 27 limbs and it was performed in varicose veins missed at operation and varicose veins remaining after endovenous laser treatment. In a total of 56 patients, 2 patients (3.57%) had recurrences after endovenous laser treatment and were treated with phlebectomy. Conclusion: Our findings demonstrated that 980-nm endovenous laser treatment had good cosmetic results with acceptable complications. This study was based on short-term results and long term follow-up is necessary to evaluate the accurate effects of treatment and recurrence. We think that multimodality treatment with endovenous laser treatment including phlebectomy or transilluminated powered phlebectomy can help decreasing of recurrence especially in patients with tortuous varicose cluster. 배경: 하지정맥류에 대한 치료법으로 980-nm 다이오드 레이저를 이용한 정맥혈관내 치료가 최근에 소개되어 치료법의 하나로 이용되고 있다. 정맥혈관내 레이저 치료는 절개를 하지 않아서 미용적으로 우수하며 수술에 따른 합병증을 피할 수 있다는 장점이 있다. 이에 저자는 980-nm 다이오드 레이저를 이용하여 절개를 전혀 하지 않고 정맥류 치료술을 실시하여 치료효과와 유용성을 관찰하였다. 대상 및 방법: 2003년 10월부터 2004년 4월까지 하지정맥류 환자 56명을 대상으로 84예에서 980-nm 다이오드 레이저를 이용하여 혈관내 레이저 치료를 하였다. 수술의 효과와 합병증 그리고 재발율 등을 관찰하였다. 결과: 환자들의 평균 연령은 47.2세였으며 남자가 21명, 여자가 35명이었다. 전체 84예의 하지에서 수술 후 합병증으로는 전예에서 일시적인 반상출혈이 있었으며, 국소 감각이상이 24예, 국소 피부변색이 6예, 가벼운 화상이 3예, 술 후 정맥염이 1예였으며, 전체 84예의 하지중 레이저 치료시 정맥류를 놓친 경우와 레이저 치료 후에도 정맥류가 호전이 되지 않은 경우 27예에서 부가적으로 경화요법을 시행하였다. 또한 56명의 환자 중 2명(3.57%)이 레이저 치료 후에 재발을 하여 보행성 정맥절제술로 치료하였다. 결론: 980-nm 다이오드 레이저를 이용한 하지정맥류 치료술은 심한 합병증 없이 미용적으로 우수하다고 생각된다. 본 연구는 단기간의 연구결과로서 정확한 치료효과와 재발에 관하여서는 장기적인 추적 관찰이 필요하다. 또한 하지 정맥류 환자들에게서 수술 후 재발을 줄이기 위해서는, 특히 사행성 정맥류 군집이 있는 환자들의 경우, 레이저 치료와 함께 정맥절제술이나 광투시 전동형 정맥적출술을 포함하는 다양한 치료를 하는 것이 도움이 되리라 생각된다.

Cuff Technique for Small-Diameter Vascular Grafts in the Systemic Arterial Circulation of the Rat

조석기,송인학 대한흉부외과학회 2018 Journal of Chest Surgery (J Chest Surg) Vol.51 No.6

This study determined the feasibility of the cuff technique for small-caliber vascular grafts in a rat model. A graft was implanted with the cuff technique or suture technique in a 1-cm segment of the abdominal aorta in 12 rats. The mean aortic clamp time was 29 minutes with the cuff technique and 44 minutes with the suture technique; the cuff technique was significantly shorter. Abdominal angiography at 1 week after implantation showed no significant stenosis in 9 rats, focal stenosis of the mid-portion of the graft in 1 rat with each technique, and total occlusion of the graft in 1 rat with the suture technique. We have successfully used the cuff technique for anastomosis for small-caliber vascular grafts in an animal model.