매체순환식 가스연소기 적용을 위한 Ni계 및 NiO계 산소공여입자의 반응특성

류호정,배달희,조성호,진경태 한국화학공학회 2004 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.42 No.1

매체순환식 가스연소기에 적용하기 위한 최적의 산소공여입자를 결정하기 위해 금속산화물(NiO)의 함량 변화에 따라 네 가지 (NiO 26, 44, 58, 78wt%)의 산소공여입자를 제조하여 열중량 분석기에서 환원반응특성을 측정 및 비교하였다. 제조된 입자들 중에서 NiO 약 60wt%인 입자가 산소전달능력 및 반응속도 면에서 다른 입자들에 비해 우수한 성능을 나타내었다. 산소공여입자의 제조과정에서 금속산화물 형태의 영향을 살펴보기 위해 금속산화물의 출발물질로 Ni과 NiO를 사용하여 NiO 함량이 동일한(약 60%) 두 종류의 입자를 제조하였으며 열중량 분석기와 고정층 반응기를 이용하여 반응속도, 재생성, 환원반응 유지시간 및 CO_(2) 선택도 등을 측정 및 고찰하였다. 금속산화물의 출발물질로 NiO를 사용한 입자가 Ni을 사용한 입자에 비해 반복 실험시에 정상반응조건에 빨리 도달하였고 반응속도와 CO_(2) 선택도가 높았으며 환원반응 유지시간인 길게 나타났다. 실험결과에 의해 본 연구에서 고려한 산소공여입자 중에서 금속산화물의 출발물질로 NiO를 사용한 NiO 함량이 60wt%인 입자를 최적의 산소공여입자로 선정하였다. To find a suitable oxygen carrier particle for chemical-looping combustor, four kinds of particles (NiO 26, 44, 58, 78wt%) were prepared and the reactivity of the reduction was measured and investigated by a thermo-gravimetrical analyzer. From the viewpoint of oxygen transfer capacity and reaction rate, the particle containing 60wt% of NiO showed better performance than the other particles. Also, we have prepared two kinds of oxygen carrier particles to investigate the effect of the starting material for a metal oxide component(i.e., Ni based and NiO based particles, where the weight percents of both samples were set at 60wt% as NiO). The reaction rate, regenerative ability, duration of the reduction, and CO₂ selectivity were easured and investigated by a thermo-gravimetrical analyzer and a fixed bed reactor. The results obtained here indicated that the NiO based oxygen carrier particle containing 60wt% of NiO showed better regenerative ability, reaction rate, CO₂ selectivity, and duration of the reduction, compared with the other particles, therefore we selected this particle as an optimum oxygen carrier particle.

암모니아성 질소(NH_4^+-N)제거를 위한 제올라이트성 물질의 제조

류태공,류재춘,한명식,김철규,김영호,양현수 忠南大學校 産業技術硏究所 2002 산업기술연구논문집 Vol.17 No.2

The objectives of this study were to synthesize high ion-exchangeable zeolitic materials prepared from coal fly ash and to determine the adsorption capacities for the removal of NH_4^+4-N in wastewater For comparison. NH_4^+-N adsorption capacities of commercial, natural, and synthetic(4A type, Si0_2/Al_2O_3=1.98. Na_2O/SiO_2=1.54. H_2O/Na_2O=46.95) zeolites were investigated at the same condition. Zeolitic materials were prepared from coal fly ash by hydrothermal reaction with various NaOH concentrations at the reaction time of 4h and the reaction temperature of 100℃. It showed that the zeolitic material prepared at a 4M-NaOH concentration had the most NH_4^+-N adsorption capacity. Theremoval efficiency of NH_4^+-N on the zeolitic material was little difference compared with those on natural and commercial zeolites, though it was lower than that on a synthetic zeolite(4A type). As a result, it is expected that the prepared zeolitic material could be applicable to adsorbent for the NH_4^+-N removal in wastewater.

오리 선위 점액분비세포의 점액질에 대한 조직화학적 연구

류시윤,김홍선,김무강,신태균,이영호 충남대학교 의과대학 지역사회의학연구소 1985 충남의대잡지 Vol.12 No.2

Histochemical sequential staining techniques, PAS, alcian blue pH 2.5 and pH 0.4, were applied to sections from the proventriculus of ducks to observe the histochemical properties of epithelial mucosubstances in the proventriculus of mallard and white Pekin ducks. The whole proventriculus obtained were divided systemically cross strips and processed routinely for histologic and histochemical study. Base on the histologic characteristics, we designated as upper portion which is the distal region of the esophageal-proventriculus junction, as middle portion, and as lower portion which is the proximal region of the proventricular-isthmus junction. The results obtained are as follows 1. Generally in the surface and foveolar epithelia showed the presence of the mixture of neutral and acid mucosubstances. 2. In the tubular gland showed the acidic nonsulfated and sulfated mucosubstance in addition to neutral mucosubstances with occasional neutral and acidic nonsulfated mucosubstances. 3. In the compound gland neutral mucosubstance with scant amounts of acidic mucosubstances or with lack of it were demonstrated. 4. There were recognized differences between speies in the staining intensity of all three types of mucosubstances. 5. There were recognized topographic difference in the acidity of epithelial mucosubstances according to portion.

매체순환식 가스연소기 산소공여입자의 최소유동화속도 및 고속유동층으로의 전이유속

류호정,임남윤,배달희,진경태 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.5

기포유동층과 고속유동층의 2탑 연결 가압순환유동층으로 조업되는 매체순환식 가스연소기의 설계와 조업조건 선정을 위해 산소공여입자의 최소유동화속도와 고속유동층으로의 전이유속을 측정 및 고찰하였다. 층물질로 매체순환식 가스연소기의 산소공여입자인 NiO/bentonite (평균입경 : 0.181 mm, 입자밀도 : 4,080 kg/㎥)를 사용하여 가압 기포유동층(내경 0.052 m, 높이 1.66 m)에서 층압력강하를 측정하여 온도(25-1,000℃)와 압력(1-6 atm)의 변화에 따른 최소유동화속도의 변화를 측정 및 고찰하였고 고온순환유동층(내경 0.02 m, 높이 2.0 m)에서 emptying time method에 의해 고속유동층으로의 전이유속(U_(tr))에 대한 온도(25-600℃)의 영향을 측정 및 고찰하였다. 측정된 최소유동화속도는 온도와 압력이 증가함에 따라 감소하였으며, 고속유동층으로의 전이유속은 온도가 증가함에 따라 증가하였다. 최소유동화속도와 고속유동층으로의 전이유속에 대한 본 실험의 측정값을 기존의 상관식과 비교하였으며 기존 상관식을 바탕으로 수정된 상관식을 제시하였다. In order 10 design and select appropriate operating conditions for the practical operation of chemical-loaping combustor, which consists of two interconnected fluidized beds (bubbling fluidized bed and fast fluidized bed), minimum fluidization velocity and transition velocity to fast fluidization were measured and investigated. Oxygen carrier particle of NiO bentonite particle (specific surface mean diameter: 0.181 mm, particle density: 4,080 ㎏/㎥) was used as a bed material. The minimum fluidization velocity was determined by measuring the bed pressure drop in the pressurized fluidized bed (0.052 m i.d. and 1.66 m high) with variations of temperature (25-1,000℃) and pressure (1-6 atm). The transition velocity from bubbling to fast fluidization was determined by means of emptying tim method in the high temperature circulating fluidized bed (0.02 m i.d. and 2.0 m high) with variation of temperature (25-600℃). The measured minimum fluidization velocity was increased with increasing temperature and pressure. The measured transition velocity to fast fluidization was increased with increasing temperature. The previous correlations on the minimum fluidization velocity and transition velocity to fast fluidization were compared with the present measured values to develop new correlation.

NIH-전립선염증상점수표 한국어 번역판의 타당도와 만성전립선염에서의 특징

정창호,류동수,오태희 大韓泌尿器科學會 2001 Korean Journal of Urology Vol.42 No.5

韓國産 蓼(여뀌)科 植物에 관한 本草學的 硏究 (I)

柳泓善,宋昊埈,辛民敎,金裕鎭,金台晛 한국전통의학연구소 1998 한국전통의학지 Vol.8 No.2

For the purpose of developing Korean Herbalogy with the plants of Polygonaceae which grow wild and is planted in Korea, the these and writings on herbalogy, from literature of successive generations, have been thoroughly investigative and the results obtained were as follows: 1. There were totaled to 16 genera and 156 species in Korea and among them medicinal plants are 12 genera, 47 species, some 30% in total, but the number of species may be added because of the similiar plants. 2. According to the oriental names which can be used for medical purpose, the medicinal plants belonging to the Polygonaceae family were classified as Herba 21, Radix 12, Foilum 8, Lignum 5, Flos 4, Fructus 5, Ramulus 2 and Semen 1. Thus it was noticed that Herba was the main kind. 3. According to sum of 156 species in Polygonaceae family, they were classified into Persicaria genera 63, Polygonum genera 23, Rumex genera 22, Bistorta genera 14, Aconogonum genera 6, Fagopyrum genera 5, Bilderdykia genera 4, Amblygonum genera 3, Reynoutria genera 3, Rheum genera 3, Pleuropterus genera 2, Pleuropteropyrum genera 2, Tovara genera 2, Ampelygonum genera 1, Homalocladium genera 1 and Oxyria genera 1. Thus it was noticed that Persicaria genera was the main kind, some 40.3% in total. 4. According to nature and flavour of medicinal plants, they were classified into cold, cool; 23 each, warmth, heat; 11 each, balance 11 and unidentified 5. Thus it was noticed that cold, cool is the main in nature and flavour of medicinal plants. From this result, it was revealed that the plants for medical purpose in Polygonaceae was 30% of the whole, in which HERBA was mostly abundunt and toxic plants was slightly poisonous that it will be used for clinical treatments more easily. It is considered that many experiements and clinical approaches must be continued to use Polygonaceae plants widely.

과도한 운동으로 발생한 횡문근융해증에 의한 급성신부전증 1예

문철호,류보열,모성환,김태종,기장도,박용관,김용환,정종훈 조선대학교 1995 The Medical Journal of Chosun University Vol.20 No.1

Rhabdomyolysis may be defined as a clinical and laboratory syndrome which releases muscle cell contents into the plasma, such as creatine phosphokinase, due to skeletal muscle injuries. It can be the result of many diverse causes including muscle disease, ischemia, genetic disorder, metabolic disorder, infectious disease, drugs, comatose state, trauma or vigorous exercise that can lead to acute renal failure as a complication. Since first reported in 1941, rhabdomyolysis-induced acute renal failure has been documented many times, and the major causes of this disease are carbon monoxide poisoning, snake bites, and etc in Korea Reports of acute renal failure after exercise-related rhabdomyolysis with myoglobinemia are rare. We report a case of acute renal failure caused by exercise-related rhabdomyolysis in a 20 year old man.

韓國人의 위달抗體價 調査報告

鄭泰華,全南昊,尹尙五,柳榮海 國立保健硏究院 1974 국립보건연구원보 Vol.11 No.-

조기위암의 임상적 연구

박태준,양은수,류종철,박태군,이희승,신원창,이진호,김관엽 인제대학교 1994 仁濟醫學 Vol.15 No.1

1989년 9월부터 1993년 7월까지 인제대학교 의과대학 상계백병원에서 실시한 위내시경 소견이 조기위암이며 내시경 직시하 생검결과 선암으로 판명되어, 근치적 위절제술을 시행받은 23명의 환자에서 임상적 특징을 알아보고, 문헌고찰과 함께 보고하는 바이다. The incidence and mortality rate of stomach cancer ranks well ahead of all malignancies in Korea. The prognosis is excellent in early gastric cancer of which the overall 5 years survival rate of 85∼95% is comparative with that of advanced gastric cancer of 15∼49%. So early detection with very sensitive mordality of gastroscope and surgery is the only premise to decrease the mortality rate of gastric cancer. This report deals with the clinical aspects of 23 cases of early gastric cancer, which were confirmed with histopathologic examination of resected stomach during the 4 years from September 1989 to July 1993 at Sanggye Paik hospital, Seoul, Korea. Out of 23 cases of early gastric cancer, 14 cases were male, 9 cases were female, and the male to female ratio was 1.6 : 1. The most common type of early gastric cancer was talc type(43.5%), IIc and its combined type comprised most of them(87.0%). The most prevalent sloe of lesion was gastric angle(43.5%) and the most common direction was lesser curvature(73.9%) 19 cases of 23(78.3%) were between 1∼3cm in size, and there was no statistical significance between the size of the lesion and lymph node metastasis. Of the 9 cases with mucosal lesion, there were 2 cases with lymph node metastasis(22.2%), but 7cases(50.0% ) of 14 cases with submucosal lesion presented lymph node metastasis. Diagnostic accuracy of endoscopy on detection of early gastric cancer was 17 cases(73.9%) of total 23 cases in our study. As with other report, histopathulogic examination of resected stomach revealed adenocarcinoma, tubular type as the most common type. Frequent complaint of patients with early gastric cancer was epigastric pain(65.2%), and duration of the symptom was less than 12 months in 17 cases(73.1%) of 23 patients with early gastric cancer.

가상현실시스템(CAVE)을 활용한 문화 Content의 복원 과정을 통한 CAVE활용 방안에 대한 연구

김태열,유석호,허영주 公州大學校 工學硏究院 生産技術硏究所 2004 論文集 Vol.12 No.-

80, 90년대의 영화에서만 보아오던 가상현실이 과학 및 컴퓨터 기술의 비약적인 발전을 바탕으로 우리에게 가까이 다가오고 있다. 다양한 가상현실 시스템 (VRML, HMD, FishTank, Wall Type, CAVE Type 등)의 개발과 함께 그 시스템의 발전으로 더욱 현실감 있는 가상현실 구현이 가능해지고 있다. 몰입감이 높은 가상현실은 이로써 사람들이 일상적으로 경험하기 어려운 환경을 직접 체험하지 않고서도 그 환경에 들어와 있는 것처럼 보여주고 조작할 수 있게 해주는 것이다. 가상현실의 응용분야로는 교육, 고급 프로그래밍, 원격조작, 원격위성 표면탐사. 탐사자료 분석, 과학적 가시화(scientific visualization) 등을 들 수 있다. 구체적인 예로서, 탱크 및 항공기의 조종법 훈련, 가구의 배치 설계, 수술 실습, 게임 등 다양하다. 이런 가상현실 시스템에서는 인간 참여자의 실제조작과 가상 작업공간이 하드웨어로 상호 연결된다. 이렇게 상호 연결된 하드웨어로 인간의 오감을 적절하게 자극하여 몰입감을 더하여 준다. 아직 많은 부분이 모자라지만 많은 연구와 노력으로 빠른 시간 안에 거의 인간이 느낄 수 있는 느낌을 가상현실에서도 현실과 같이 느낄 수 있을 것이다. 이 논문에서는 가상현실시스템의 기본적인 정의와 개념 그리고 종류를 알아보고 그 중에서 몰입감이 뛰어난 CAVE형의 가상현실시스템에 대하여 개념분석을 하였고 다음으로 2003년 KISTI(한국과학기술정보연구원)에서 만들어진 경복궁(문화 원형 Content)을 가상현실시스템에서 복원 과정을 Design process를 거쳐 제작되는 과정을 통해 가상현실시스템에서의 VR프로그래밍 방법과 모델링 방법을 제시하였다. 이러한 과정을 통해 몰입형 가상현실시스템의 활용성에 대해 알아보았고 지금 시점에서 이러한 CAVE형 가상현실 시스템의 활용방안에 대하여 연구해 보았다. 끝으로 가상현실시스템을 활용한 문화재 복원 과정에서 나타난 문제점에 대하여 서술 하고 가상현실시스템의 활용 방안을 제시한다.