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Ni-Ru 계열 촉매 상에서의 CH<sub>4</sub> 수증기 개질 반응
정진혁(Jeong, Jin Hyeok),이정원(Lee, Jung Won),이득기(Lee, Duek Ki),김동현(Kim, Dong Hyun),서동주(Seo, Dong Joo),서유택(Seo, Yutek),윤왕래(Yoon, Wang Lei) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
본 연구에서는 기존 니켈 활성성분만의 알루미나담지 촉매에 비해 고온에서의 수소를 사용한 환원 전처리 과정을 거치지 않고도 높은 반응활성을 나타내며, 반응 중 탄소침적에 대한 촉매 저항성에서도 우수한 결과를 나타낸 루테늄-니켈 촉매에 대해보고 하고자 한다. 메탄 수증기 개질 반응을 통해, 루테늄을 최종적으로 담지한 알루미나 담지니켈계 촉매는 별도의 전처리과정 없이 650?C에서부터 높은 반응성을 보였으며, 루테늄과 니켈을 동시에 담지한 경우보다 더 우수한 활성을 나타내었다. Ru의 담지량을 달리한 실험에서는RU(0.5)/Ni(20)/Al₂O₃ 촉매가 가장 높은 활성을 보였다. H₂-TPR 분석 결과, Ru(0.5)/Ni(20)/A1₂O₃촉매의 경우 세 가지 환원 피크가 나타났으며, Ni(20)/A1₂O₃촉매와 비교해 볼 때, 저온(<130?C)에서 환원가능한 RUO₂의 존재를 확인할 수 있었다. 담지된 RU은 분산도가 높아, XRD분석 결과에서 Ru이나 RuO₂의 특성 피크가 존재하지 않았다. 또한 650?C에서 10시간 개질반응 후 얻어진 촉매에 대해 O₂-TGA를 분석한 결과, Ni(20)/Al₂O₃촉매는 -7.2wt% 정도의 큰 무게 감소를 보였으며, 이는 촉매 표면에 생성된 carbon tube에 의한 것임을 SEM 분석을 통해 알 수 있었다 이에 반해, Ru(0.5)/Ni(20)/Al₂O_ 촉매는 O₂-TGA시 0.3wt% 정도 무게 증가에 그쳤으며, SEM 분석상 carbon tube의 생성이 크게 억제되었음을 알 수 있었다.
인후두 역류증의 치료 시 증상과 후두내시경 소견의 변화
태경,이용섭,정진혁,박인범,이승환,김경래,Tae, Kyung,Lee, Yong-Seop,Jeong, Jin-Hyeok,Park, In-Beom,Lee, Seung-Hwan,Kim, Kyung-Rae 대한후두음성언어의학회 2005 대한후두음성언어의학회지 Vol.16 No.1
Background and Objectives : To determine the changes of reflux symptoms and laryngoscopic findings of patients with laryngopharyngeal reflux (LPR) on the duration of proton pump inhibitor medication. Materials and Methods : From Feb 2003 to Nov 2004, 58 patients who were diagnosed with LPR by 24-hour double-probe pH monitoring were enrolled. All patients were treated with proton pump inhibitor and followed up for 8 weeks at least. The response of symptoms and laryngoscopic findings of patients were assessed with reflux symptom index (RSI) and reflux finding score (RFS) before treatment and 2, 4, 8, 12, 16, 20 weeks after treatment. Results : The symptoms of patients with LPR were improved significantly at 2, 4, 8 weeks of treatment. The laryngoscopic findings of patients with LPR were improved significantly at 4 and 12 weeks of treatment. There was no correlation between improvement of reflux symptoms and laryngoscopic findings. Conclusions : The laryngoscopic findings of LPR patients were improved more slowly than reflux symptoms. Based on our results, anti-reflux therapy might be continued at least for 3 months until the improvement of laryngoscopic findings.
이윤재(Yun Jae Lee),정진혁(Jin Hyeok Jeong,),오영하(Young Ha Oh),지용배(Yong Bae Ji) 대한두경부종양학회 2019 대한두경부 종양학회지 Vol.35 No.2
Large cell neuroendocrine carcinoma is a rare epithelial neuroendocrine malignancy and is preferentially located in gastrointestinal tract and pancreas. Cases of large cell neuroendocrine carcinoma have been reported in many other locations, including the thymus, gallbladder, prostate, larynx, salivary glands, nasopharynx, tonsil and mastoid. However, primary sinonasal large cell neuroendocrine carcinoma never have been reported in Korea. We experienced a case of primary large cell neuroendocrine carcinoma arising from left maxillary sinus recently. A 82-year-old male patient presented with nasal obstruction and epistaxis. The biopsy revealed large cell neuroendocrine carcinoma with poor differentiation. After a general evaluation, the patient was staged as cT3N0M0. The patient was treated by combined radiotherapy and chemotherapy. We report this rare case with literature review.
태경,이형석,권순욱,정진혁,김경래,Tae, Kyung,Lee, Hyung-Seok,Kwon, Soon-Wuk,Jeong, Jin-Hyeok,Kim, Kyung-Rae 대한기관식도과학회 1998 大韓氣管食道科學會誌 Vol.4 No.1
Benign symmetric lipomatosis was initially described in 1846 by Sir Benjamin Brodie. In 1888, Otto Madelung presented 33 cases of benign symmetric lipomatosis and described the classic“horse collar”cervical distribution of the lipomatous tissue. Launois and Bensaude described benign symmetric lipomatosis as a distint syndrome characterized by a diffuse, symmetric, fatty accumulation in the cervical region. This disease is rare condition affecting mostly middle aged alcoholic men and associated with many systemic diseases such as diabetes mellitus, hyperuricemia, renal tubular acidosis, liver enzyme abnormality etc. The condition does not spontaneously involute and surgical excision is the only proven method of treatment, and recurrence is frequent. We experienced six patients of benign symmetric lipomatosis who underwent surgical excision via collar incision which afford wide exposure of the entire cervical area. We report them with the review of literature.
이윤정,문상원,조희윤,정진혁,Yoon Jung Lee,M,D,Sang-Won Moon,M,D,Hee Yoon Cho,M,D,Jin-Hyeok Jeong,M,D 대한안과학회 2008 대한안과학회지 Vol.49 No.5
Purpose: Septal deviation has few subjective symptoms. However, a difficulty remains in doing DCR (dacryocystorhinostomy) in these patients. We investigate the clinical course of DCR in patients with a septal deviation. Methods: Acquired nasolacrimal duct-obstructed patients who had undergone DCR with septal deviation from 2003 to 2006 in our hospital were retrospectively analyzed. We measured the septal distance using paranasal computed tomography taken preoperatively and compared the sex and age of patients, the kinds of operations, outcome of surgery, and ocular and nasal complications in our analysis. Results: Twenty-two eyes of 22 patients with a mean age of 55.3 years (range 29~74) were analyzed (4 males, 18 females). Mean septal distance was 4.84 mm (range 2.18~6.99 mm). Nineteen eyes had endonasal DCR, and three had external DCR. Two had DCR combined with septoplasty. Three had septoplasty as a secondary operation, Nasal complication was synechiae in 9 eyes. DCR success was seen in 15 eyes, and DCR failure in 7 eyes. Septal distance was not correlated with DCR success but was correlated with nasal complication (Mann-Whitney test, p=0.003) Conclusions: In the case of DCR with septal deviation, the surgical technique used will need to minimize the mucosal injury and ensure appropriate nasal correction to prevent future complications.
후두암종에서 예방적 경부청소술로 확인한 경부 잠재전이율
이형석(Hyung Seok Lee),정진혁(Jin Hyeok Jeong),이동욱(Dong Wook Lee),정진석(Jin Seok Jeong),태경(Kyung Tae) 대한두경부종양학회 2004 대한두경부 종양학회지 Vol.20 No.1
Background and Objectives: Neck metastasis is one of the most important prognostic factor in head and neck squamous cell carcinoma. Recently, elective neck dissection has been widely accepted for accurate pathologic staging and elective treatment of neck. Occult metastasis rate of laryngeal cancer varies widely depending upon authors. To evaluate the rate and characteristics of occult metastasis and efficacy of the elective neck dissection in clinical N0 laryngeal cancer, we performed this study. Materials and Method: Seventy two patients (supraglottic cancer: 19 cases, glottic cancer: 53 cases) who underwent surgery for laryngeal cancer as an initial treatment from 1993 to 2002 were evaluated. All was underwent elective neck dissection at the time of surgery for the primary treatment. The record of patients and pathologic report were reviewed retrospectively. Results: Occult metastasis rate of supraglottic and glottic cancer were 42.1% (8/19) and 9.4% (5/53), respectively. According to T stage, the occult meastasis of supraglottic and glottic cancer was 20%, 0% in T1, 36.4%, 0% in T2, 100%, 40% in T2, 100%, 20% in T4, respectively. Occult metastasis was mostly confined within level II (69.2%), III (76.9%), IV (23.1%). Conclusion: Based on ours results, elective neck dissection might be needed in treating of clinically N0 all supraglottic cancer and advanced T3, T4 glottic cancer.
가정용 고분자연료전지 시스템을 위한 통합형 천연가스 개질기 개발
서유택(Seo, Yutaek),서동주(Seo, Dong Joo),정진혁(Jeong, Jin Hyeok),윤왕래(Yoon, Wang Lai) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
수소 기반의 에너지 사회는 중소규모 분산 발전과 연료 전지 자동차에서 시작될 거라는 예측이 지배적이다. 가정용 고분자 연료전지 시스템은 상업화에 가장 가까운 소규모 분산 발전 시스템중의 하나이며, 에너지기술연구위원에서는 가정용 고분자 연료전지에 수소를 공급하기 위한 천연가스 수증기 개질시스템의 개발을 진행해 왔다. 효율 향상과 제작의 용이성, 그리고 소형화에 초점을 맞추어 개발된 prototype-I은 2.0Nm³/hr의 순수 수소 생산 용량을 가지고 있으며, 수증기 개질기와 수성가스 전이 반응기 수중기 생성 장치, 그리고 반응열 공급에 필요한 버너 등을 이중 동심원관에 통합한 형태이다. 수중기 개질과 수성가스 전이 반응을 거쳐 나오는 개질 가스의 조성은 72.3%;H₂,;4.8%;CH₄,;0.7%;CO,;22.2%;CO₂이며, 이때 S/C 비율은 2.5였다. 고분자 연료 전지 공급 시 요구되는 CO 농도가 10ppm 이하이기 때문에, 본 시스템에는 선택적 산화 반응기를 2단으로 설치하여 CO. 농도를 10ppm 이하로 낮추어주었다. 전체 시스템의 열효율은 LHV 기준으로 68%. Prototype-I의 운전을 통해 설계 개선안을 도출하였으며, 이를 적용해 제작한 prototype-II가 시험 운전 중이다,. 통합된 개질 시스템에서는 각 단위 반응기사이의 열교환을 최적화하여 단위 반응들이 적정 온도 범위에서 일어나도록 유도하는 것이 중요하다. Prototype-II는 수증기 개질 반응기와 WGS 반응기, 수증기 생성 장치 사이의 열교환율을 향상시켜 농도를 2.5%로 감소시키면서 CO의 농도는 1%이하로 유지하였다. 이 결과를 바탕으로 얻어진 메탄 전환율은 87%이고, 열효율은 LHV 기준으로 75%이다. 아울러 개선점을 적용한 선택적 산화 반응기를 제작하였다. 개질 가스와 산소의 혼합을 유도하고, 반응기 온도의 제어를 통해 선택적 산화 반응의 속도와 선택성을 향상시키고자 한다. 시스템의 운전을 통해 메탄 전환율과 열효율의 개선을 진행할 예정이다.
이승환(Seung Hwan Lee),박용욱(Yong Wook Park),정진혁(Jin Hyeok Jeong),이동욱(Dong Wook Lee),태경(Kyung Tae) 대한두경부종양학회 2005 대한두경부 종양학회지 Vol.21 No.1
Metastatic tumors of the oral cavity are uncommon. Most of them are located in the mandible while only small percentage are found within the soft tissues. The common sites of metastases to the soft tissue of oral cavity were the tongue and gingiva and among the tongue, the base of tongue was most common. An explanation of the predilection may be due to a richer vascular supply within base of tongue. The authors have recently experienced a case of small cell lung carcinoma with base of tongue metastasis in a 81-year-old male who had foreign body sensation at swallowing and muffled voice for 2 months. So, we present this case with the review of literatures.