다공세라믹 버너에서 안정화 된 화염면의 연소특성 연구

李誠浩 인천대학교 2001 국내석사

고압 T-분기관의 성형 및 사용압력 평가에 관한 연구

이성호 檀國大學校 2008 국내박사

자기연마와 전해연마의 복합공정에서 가공메커니즘 규명과 응용

이성호 부경대학교 2013 국내박사

Magnetic abrasive polishing was widely used for making a fine surface in a variety of industrial products. Fundamentally, this method can be applied for ferrous workpiece materials since the non-ferrous material has little magnetic flux density. Nowadays, nevertheless, the materials for most products are changing from metal to non-metal, because of reducing the weight of products and showing the excellent properties in comparison to a conventional product. The new material adoption like this makes the magnetic abrasive polishing difficult to finish that material. Thus, the development of a new polishing method for the non-ferrous materials is necessary. In this study, an efficient hybrid machining system combined with electro polishing and magnetic abrasive polishing was developed, and then this system was used for polishing and deburring of a micro-channel. New abrasives, which were mixed with carbon nanotube (CNT) and cobalt (Co) particles, were applied for this hybrid system. The carbon nanotube has an excellent wear resistance as a polishing abrasive but it is non-magnetic matter which is impossible to be used as the polishing abrasives in the hybrid machining. Therefore, to add this non-magnetic material to the magnetic property, metal based cobalt which has good magnetic property was molten by a plasma melting process. From this study, fundamental nature for the carbon nanotube itself as the polishing abrasive was characterized by simulation and experimentation. The suitable electrolyte for the hybrid machining with the CNT particles was selected by checking the chemical reaction with the polishing particles. The basic components for the hybrid machining system were designed and assembled such as a power supply, inductor and electro-magnet array table. Acoustic emission technique was applied to monitor the uniform surface roughness and neural network method of the input variables from the acoustic emission signal parameters was adopted for predicting the surface roughness after the hybrid machining. A circulation unit for the hybrid machining system was newly designed for maintaining uniform concentration of the CNT particles and easily scattering the CNT particles into the electrolyte. The machined small sized chip was filtered by a magnetic filter unit and this kind of filter unit was essential for the hybrid machining system. As a case study, the micro channels for the separate plate of a fuel cell were polished and a burr occurred at the corner of the micro channel was removed. After experiments, the response surface models for burr height and surface roughness were developed and confirmed by the additional verification test. The dominant parameters for the hybrid machining process were determined and the optimal conditions for producing the good surface quality were selected by the design of experimental method. Finally, it was indicated by this study that the developed hybrid machining process combined with the electro polishing and the magnetic abrasive polishing was one of practically applicable methods for producing a high quality surface of precision products.

폐 사과 껍질을 이용한 폐수중 중금속 제거 특성에 관한 연구

이성호 한국과학기술원 1997 국내석사

호텔 식음종사자와 일반소비자 간의 와인 선택속성 및 선호도 비교 연구

이성호 한경대학교 2013 국내석사

인산 대사 관련 유전체의 특성 규명

이성호 배재대학교 대학원 2007 국내박사

PhoB는 pho regulon의 response regulator 단백질이다. 환경내 phosphate(Pi)가 제한될 때 PhoR은 PhoB 단백질을 인산화하고 인산화된 PhoB는 pho regulon의 하위 유전자들을 활성화 한다. Enterobacteraceae속 phoBR의 보존된 염기서열을 이용하여 primer를 제작하여 8균주로부터 PCR 클로닝한 phoBR 유전자들에 대한 염기서열을 결정하고 분석하였다. 각 균주의 phoB 유전자의 염기서열에 대한 상동성을 비교한 결과 각각 82%∼99%의 유사성이 있었고, 아미노산 서열을 비교 분석한 결과, 95%∼100%의 상동성을 보였다. 또한 phoR 유전자의 경우 95%∼100%의 유사성을 보였으며, PhoR 단백질은 83∼100%의 상동성을 보였다. Enterobacter aerogenes의 PhoB 단백질의 보존된 acidic residues(아미노산 서열 9∼11번째)를 site-directed mutation 시켰다. pBluescriptII vector에 클로닝된 phoB mutant들을 E. coli에 형질 전환시켜 phosphate를 starvation시킨 후 BAP(bacterial alkaline phosphatase) test를 수행한 결과, E9Q와 E11A의 double mutant에서 low Pi 뿐만 아니라 high Pi 상태에서도 pho regulon에 속하는 유전자를 유도하는 PhoB^(c)(constitutive PhoB)를 확보하였다. Proteomic profiling 연구를 통하여 PhoB의 constitutive한 발현에 따른 단백질의 변화 양상을 확인하였다. Ent. aerogenes의 BAP 유전자인 phoA를 클로닝하여 염기서열을 결정하였고 phosphate starvation 하에서 Ent. aerogenes도 E. coli의 phoA(BAP)처럼 합성이 유도되어지는 것을 BAP assay를 통하여 확인하였다. 또한 PhoA-CAT assay(PhoA promoter 활성측정)를 통하여 phosphate limitation시 transcriptional activator인 PhoB 단백질에 의해 활성이 유도되는 것을 확인하였다. Ent. aerogenes의 phoA유전자의 down stream에는 E. coli K-12에서와 같이 psiF(unknown function)와 proC 유전자가 존재하였다. pho box(CTGTCATTTTTTTGTCAC)와 -10(TAAAGT)을 결정하였고 다른 박테리아의 PhoA와 아미노산 서열을 비교한 결과, Shi. dysenteriae (ZP00921794)와 87%의 상동성을 E. coli(AAA24364)와는 86%의 상동성을 가지고 있었다. PsiF 단백질의 경우 Shigella(NP706148) 그리고 E. coli(NP494918)와 66%의 상동성을 가지고 있었다. T7 promoter 과발현 시스템을 이용하여 PhoA를 과발현 시키고 His-tag으로 정제한 후, Ent. aerogenes의 phoA 유전자 산물의 분자량을 확인한 결과 57 kDa인 것을 확인하였다. SDS-PAGE상에서 단백질을 refolding 시킨 후 α-naphythyl phosphate과 XP solution을 처리하여 AP+(BAP) 단백질의 특성을 확인하였다. Phosphonates(Pn)은 C-P 공유결합을 가지고 있는 난분해성 인산염이다. 본 연구에서 C-P화합물에 대하여 분해능이 있는 것으로 탐색·선별된 7균주를 형태적, 생리·생화학적 특성 그리고 분자생물학적 특징을 연구하여 분류·동정을 하였다. 16S rDNA를 클로닝한 후 염기서열을 분석하였고 7균주간의 상동성에 대하여 비교·분석하였다. KSL1은 Klebsiella oxytoca로, KSL6과 KSL7은 Ent. amnigenus로 KSL9는 Citrobacter freundii로, KSL10과 KSL101은 Leclercia adecarboxylata로, KSL105는 Rhizobium sp로 동정하였다. 또한 C-P lyase gene cluster를 확인하기 위하여 primer를 제작하여 polymerase chain reaction과 Southern blot을 이용하여 C-P lyase 유전자들의 존재를 확인하였다. 각 균주에 따라 부분적으로 phn 유전자의 염기서열을 결정하였다. KSL9(Citrobacter freundii)의 MPn 분해시, proteomic profiling method를 이용하여 단백질 발현의 변화를 확인 하였다. PhoB is the response regulator of the pho regulon. When environmental Pi becomes limiting, PhoR transduces this signal, phosphorylating PhoB and the phosphorylated PhoB then activates transcription of genes in the pho regulon. The specific oligonucleotide primers(genus of Enterobacteraceae for phoBR) were used to amplify by the polymerase chain reaction (PCR) and sequenced. The results showed comparative analysis across 8 strains revealed conserved phoBR genes by sequencing. The homology of 82%∼99% identies in nucleotide sequences compared with phoB gene among strains and 95%∼100% homology in the amino acid sequence with PhoB. The phoR are 76%∼100% identies and PhoR are 83%∼100% homologue respectively. Phylogenetic tree is suggested the evolution of phoBR genes. The site-directed mutations were introduced at the conserved acidic residues in the regulatory domain of Ent. aerogenes PhoB. The pBluescriptII vectors with the phoB mutants and its promoter were transferred into E. coli strains and determined the alkaline phosphatase activities in the high and low phosphate media. Among the mutants, E9Q and E11A double mutant showed the constitutively activation at high and low phosphate conditions. The paper discussed the enzymatic responses of the mutants by protein profiling method. Also, we cloned and sequenced the phoA gene encoding bacterial alkaline phosphatase from Ent. aerogenes. The phoA gene is a member of pho regulon genes which are induced under the phosphate limitation and acivated by transcriptional activator PhoB protein by CAT assay. In the down stream of phoA, psiF(unknown function) and proC genes were also found like the gene order in E. coli. The pho box(CTGTCATTTTTTTGTCAC) and -10(TAAAGT) region in phoA promoter region were also found out in the paper. Amino acids of PhoA and PsiF were campared among other bacterial species. On the basis of BLAST analysis, the PhoA is shown to have 87% and 86% homology in amino acid sequence with Shi. dysenteriae(ZP00921794) and E. coli(AAA24364). The PsiF is shown to have 66% similarity in amino acid sequence with Shigella(NP706148) and E. coli(NP494918) but Salmonella(YP151536) is shown to have 65% similarity. PhoA were used to purified by the His-tag and then it was detected from the SDS-PAGE. The molecular weight determinated 57kDal. After reactivation of the gel, PhoA detection were found after using the alkaline phosphate substrate, α-naphythyl phosphate and XP. Phosphonates (Pn) are characterized by a carbon atom covalently bonded to phosphorus. In order to determine the taxa of those C-P compound degradation bacteria, the 16S ribosomal DNAs (rDNAs) were cloned and sequenced. Using the BLAST and ClustalW Program, phylogenic trees, genetic similarities and multiple sequence alignments of 16S rDNAs were analyzed and identification of bacteria on the basis of Bergey's manual was carried out. The seven C-P compound degradation bacteria were identified as follows : KSL6 and KSL7 are Ent. amnigenus, KSL10, and KSL101 are Leclercia adecarboxylata, KSL1 is Klebsiella oxytoca, KSL9 is Citrobacter freundii, KSJ105 is Rhizobium sp.. Also C-P lyase genes were cloned from KSL1, KSL6, KSL7, KSL9, KSL10, KSL101 and KSL105 by polymerase chain reaction and southern blot, partially sequenced genes of the phn operon. The paper discussed the protein responses of the KSL9(Citrobacter freundii) by use of proteomic profiling method when MPn was degraded.

집합건물 관리에 관한 연구

이성호 경상대학교 대학원 2018 국내석사

According to the relationship between the management team of the building complex and the management subject of the apartment complex, the apartment complex, the rental complex, the closed complex, and the large-scale mall Etc. are defined according to the characteristics of each property, and in order to determine the scope of the building, it is necessary to define the object of compulsory management for the management of the small-scale building (apartment house)Legislation should be in the direction of minimizing the blind spot for management. In addition to the fact that apartment houses have the characteristics of public goods by the intervention of the law related to the management of the collective buildings, it is necessary to secure the transparency of the safety and management of the collective buildings through the discipline of the common part management, This is because it is necessary to prevent conflicts of property rights by reasonably coordinating the interests between the different owners. As a result of this, the Assembly Building Act, which has been in operation for more than 30 years, is now being revised in accordance with the Law on the Settlement Building, the Housing Act, the Housing Management Act, the Improvement of the Conflict Management Act And housing management support centers for small - scale housing complexes. It should be possible to supplement the management of collective buildings in legislative legislation of housing management law in other laws.

Roll based continuous fabrication system for micro/nano structures and their applications : 롤 장비 기반의 미세구조 연속생산시스템 개발 및 응용방안

이성호 경북대학교 대학원 2020 국내박사

본 논문에서는 롤타입 장비를 기반으로 하는 미세구조 제작 방법을 통해 다양한 재료를 활용한 미세구조 연속생산방식에 관한 개발을 제안하였다. 지난 수십여 년 간 미세구조 제작방법의 발전을 통해 다양한 모양의 미세구조 제작이 가능하게 되었다. 미세구조에서는 거시적 구조에서는 나타나지 않는 새로운 현상들이 발견되며, 이를 활용하여 다양한 기능을 갖는 기능성 표면이 개발되었다. 이를 실생활 및 산업 전반에 활용하고자 하는 수요가 지속적으로 증가하고 있지만, 미세구조를 가진 기능성표면은 제작방법의 특성상 샘플의 면적이 작고, 생산성이 매우 떨어지는 단점이 있다. 이러한 문제를 해결하기 위해 많은 연구진은 롤타입 장비를 이용한 미세구조 제작방식에 관해 활발히 연구를 진행하고 있다. 이러한 흐름에 발맞춰, 우리는 롤타입 기반의 장비를 이용하여 다양한 재료를 이용한 미세구조를 연속생산 하는 연구를 진행하였고, 다양한 분야에 활용하기 위해 지금껏 개발되지 않은 새로운 연속생산 공정을 개발하는데 성공하였다. 본 논문에서는 크게 마스터몰드와의 직접적인 접촉으로 미세구조를 형성하는 Imprint lithography 방식의 연속제작 방법과 빛을 이용하여 미세구조를 형성하는 Photo-type lithography 방식의 연속제작 방법으로 나누어 논문을 구성하였다. 먼저 임프린트 리소그래피 타입의 연속제작 방식에서는 새로운 연속생산 방식을 개발하고 활용방안으로 게코도마뱀의 발바닥을 모사한 건식접착제의 연속제작에 관한 실험을 진행하였다. 게코도마뱀의 발바닥은 마이크로/나노 계층구조를 갖는 수많은 섬모로 구성되어 있으며, 이를 모사한 건식접착제가 개발되었다. 게코도마뱀의 발바닥을 모사한 건식접착제는 유리표면과의 높은 접착력을 보이며, 이를 실생활 및 산업 공정에 활용하고자 하는 수요가 증가하고 있다. 게코도마뱀의 발바닥을 모사한 건식접착제는 마이크로 스케일의 계층구조로 이루어져있는데, 이러한 구조의 마스터몰드를 제작하기 위해서는 많은 비용이 소요된다. 이러한 문제를 해결하고자 본 연구에서는 UV 경화성 물질의 경화 특성을 활용하여 마이크로 기둥을 갖는 간단한 구조의 저렴한 마스터몰드에서 계층구조를 갖는 건식접착제를 연속제작하는데 성공하였다. UV 노광시간을 조절하여 UV경화성 물질의 경화되는 정도를 조절할 수 있는데, 이를 통해 마이크로 기둥은 완전히 경화된 반면, 마스터몰드에 닿아있는 표면은 겉으로만 경화된 부분경화 상태를 나타낼 수 있다. 부분경화된 표면에 압력을 가해 표면적을 넓히는 방식으로 계층구조를 제작하는데 성공하였다. 롤타입 장비를 통해 연속생산된 건식접착제는 단위면적당 9.5 N의 높은 접착력을 나타내었고, 5000번의 반복테스트 후에도 90 %의 성능이 보존됨을 확인하였다. 임프린트 리소그래피 타입의 두 번째 연구로 열경화성 폴리머를 이용한 연속공정 기술에 관한 연구를 진행하였다. MEMS 분야에서 많이 활용되고 있는 PDMS는 매우 투명하고, 성형성이 뛰어나 임프린트 리소그래피의 레진, 몰드로 많이 이용되고 있다. 표면에너지가 낮고, 생체적합성 등 PDMS는 매우 많은 장점이 있지만, 열경화성 폴리머의 특성상 경화에 비교적 많은 시간이 소요되어 연속생산의 레진으로는 여겨지지 않았다. PDMS는 온도에 따라 경화시간이 달라지는데, 높은 온도에서는 경화시간이 빨라진다. 본 연구에서는 이런 PDMS의 특성을 이용하여 PDMS를 레진으로 하는 롤타입 기반의 연속공정 기술을 개발하였으며, 실적용을 위한 활용방안으로 앞서 기술한 게코도마뱀의 발바닥을 모사한 건식접착제를 연속 제작하여 유리이송 실험을 수행하였다. PDMS로 제작된 건식접착제를 150 mm/min 의 속도로 제작하는데 성공하였으며, 단위면적당 11.2 N의 높은 수직방향의 접착력과, 5000번 테스트 후에도 9.3 N의 높은 성능을 유지함을 확인하였다. 로봇암을 활용한 실험결과 1.2 kg 의 유리기판을 성공적으로 들어올리고, 다양한 움직임에도 유리기판이 떨어지지 않고 접착이 잘 유지됨을 확인하였다. Photo-type lithography를 활용한 연속생산 방식에서는 빛 노광을 활용한 다양한 미세구조 제작방식 개발을 제안하였다. 앞서 제작한 UV임프린트 리소그래피 연속생산방식을 활용하여 연꽃잎의 표면을 모사한 마이크로/나노 구조를 계층구조를 가진 표면을 제작하였고, 소수성 표면처리와 낮은 파장의 DUV 노광을 통해 스테노카라의 등껍질을 모사한 친수/소수 복합표면을 제작하여 수분포집 실험을 수행하였다. 이에 대한 적용방안으로 공기 중에 함유된 오염물을 검출하기 위한 실험을 진행하였고, 수은을 이용한 실험을 통해, 포집된 물에서 오염물 검출이 가능함을 확인하였다. 다음으로는 포토롤리소그래피 장비를 제작하여 포토롤리소그래피의 공정효율 향상을 위한 실험을 진행하였다. 포토리소그래피는 산업전반에 매우 다양하게 활용되고 있으며, 수율과 정밀도가 뛰어난 장점이 있다. 하지만, 포토리소그래피는 미세구조를 형성하기 위한 마스크가 필요하기 때문에 마스크 크기에 한정되어 공정이 가능하단 단점이 있다. 이러한 단점을 해결하기 위해 Prof. M. K. Kwak 연구진에 의해 포토롤리소그래피 방식이 개발되었다. 본 실험에서는 개선된 포토롤리소그래피 장비를 이용하여 포토리소그래피 공정효율 향상을 위한 실험을 수행하였으며, 포토롤리소그래피 공정 시 포토레지스트와 UV 광원과의 반응시간, 최적 광량 도출 등을 바탕으로 포토리소그래피 공정의 최적화에 관한 연구를 수행하였다. 또 포토롤리소그래피를 통해 선폭 15 μm 의 대면적 금속 베젤을 제작하여 실제 공정에 사용이 가능함을 확인하였다. 마지막으로 플라즈몬 현상을 이용한 플라즈모닉 리소그래피를 롤장비를 이용하여 연속으로 실시할 수 있는 공정기술을 개발하였다. 차세대 리소그래피 기술이라 각광받는 플라즈모닉 리소그래피는 광원보다 작은 크기의 금속 표면에 빛이 조사되면 전자들의 집단 진동현상인 표면 플라즈몬 현상이 발생하게 되는데, 이 때 발생하는 전기장을 이용하여 광원으로 이용하여 매우 작은 크기의 미세구조를 형성할 수 있다. 이 때 발생하는 전기장의 범위는 수십 ~ 수백 나노미터 정도이기 때문에 기판과의 완전한 접촉이 매우 중요하다. 본 실험에서는 포토롤리소그래피 장비를 응용하여 레이저를 광원으로 하는 플라즈모닉 롤러 리소그래피 장비를 제작하였으며, 플라즈모닉 리소그래피를 연속으로 진행하는 공정을 개발하였다. 본 공정을 통해 18 mm/min 의 속도로 61.25 nm의 선폭을 갖는 매우 미세한 나노그레이팅 구조를 연속으로 제작하는데 성공하였다. 본 논문에서는 미세구조를 가진 기능성표면에 생산성 향상을 위해 롤타입장비를 기반으로 하는 다양한 미세구조 제작 방법의 개발을 제안하였다. 간단한 마이크로 기둥구조를 이용한 계층구조의 연속제작방식, 열경화성 폴리머를 이용한 연속제작, 플라즈모닉 리소그래피의 연속제작방식 등을 새로이 개발하였으며, 공정 효율 향상을 위한 다양한 실험을 수행하였다. 또한 실생활 및 산업 현장에 활용가능성을 확인하기 위해 성능테스트, 유리이송, 금속 전극 제작, 오염물 검출 실험 등 적용방안을 모색하였다. In this thesis, we propose development of roll type equipment based continuous fabrication methods of micro/nano structure using various materials for enhancement of functional surface composed of micro/nano structure. The demand to utilize micro/nano structured surface in the practical life and the industry fields have been increased. However, the functional surface with a micro/nano structure has disadvantage that the patterned area is limited as only the master mold size and the productivity is very low due to the characteristic of the fabrication method. In this study, to solve this problem, we have conducted development of roll type equipment based continuous fabrication methods of micro/nano structure using various materials. As a result, I have achieved in development of new continuous fabrication processes. First, in part of the continuous fabrication method of imprint lithography type, we developed two continuous fabrication methods and conducted performance tests by using a gecko-foot inspired dry adhesive. Since the gecko foot inspired dry adhesive is composed of microscale hierarchical structure, high cost and complex tricky fabrication method are needed to fabricate master mold. In order to solve this problem, in this study, we have carried out development of the two step continuous fabrication method of a dry adhesive having a hierarchical structure from a low cost master mold with a microscale pillar array by utilizing the curing property of UV curable resin. Various experiments were conducted to measure the performance, and the dry adhesive fabricated continuously through the roll-type equipment showed high pull-off strength of 9.5 N per unit area, and 90% of the performance comparing initial state was remained after 5000 repeated test. A second study of the imprint lithography type involved the study of continuous fabrication system using thermosetting polymers. The PDMS has many advantages, however, due to the characteristic of thermosetting polymer, it takes relatively long time to cure. Therefore, PDMS was not considered a resin for continuous fabrication system so far. In this study, we developed a roll type-based continuous fabrication system using PDMS resin using the curing characteristics of PDMS. As a result, the dry adhesive composed of the PDMS was successfully fabricated at a speed of 150 mm/min, it showed a high pull-off strength of 11.2 N per unit area at initial state and showed pull-off strength 9.3 N per unit area after 5000 repeated test. To observe feasibility of utilization in practical life, experiment of simple glass transportation was implemented by using the robot arm. As a result, a 1.2 kg-weight glass substrate was successfully lifted and attachment between the glass substrate and dry adhesive was well-maintained without falling even various movements. In the continuous production method using photo-type lithography part, we proposed the development of various microstructure fabrication methods using light exposure. As a first experiment, using the UV imprint lithography continuous fabrication system, a superhydrophobic surface composed of micro/nano hierarchical structure inspired by lout leaf was fabricated using imprint lithography on a PET substrate. Also partial areas of the fabricated hydrophobic surfaces were made into hydrophilic surfaces by surface treatment using DUV. Water collecting experiment with hybrid surface and thermoelectric module was implemented. As a result, about 10.5 mg water was collected from the air. As a feasible application of this functional surface, an experiment for detecting contaminants in the air was conducted, and through this experiments, it was confirmed that contaminants in the air could be detected with the collected water. Next experiment of photo-type lithography was development of continuous fabrication system for conventional photolithography. This system was already introduced as photo-roll lithography (PRL) by Kwak et. al. In this study, an advanced PRL system was design and experiments for optimization of PRL system were conducted to improve productivity of the photolithography. To reveal the optimization of PRL system, various parameter studies were performed based on the reaction time of the photoresist with the UV light source and the optimal process condition of PRL system was found. As an application, the large-area metal wire with a width of 15 μm for bezelless was fabricated successfully via PRL system. Lastly, we developed plasmonic roller lithography. In this experiment, the plasmonic roller lithography was implemented using a 405 nm laser as a light source instead of UV source. In plasmonic lithography, contact issue is very important. This challenge was overcame by using a two thin PDMS cushion layers and fabrication of high resolution nano-grating structure with a line width of 61.25 nm was achieved continuously with a speed of 18 mm/min via plasmonic roller system. In this thesis, I proposed the development of various micro/nano structure fabrication methods based on roll type equipment to improve productivity on functional surfaces with micro/nano structures. We have newly developed a various continuous fabrication systems such as fabrication method for hierarchical structure from a simple microscale pillar structure, fabrication system using a thermosetting polymer (PDMS), and development of plasmonic roller lithography. Also, various parameter experiments have been performed to improve fabrication efficiency. In addition, to confirm feasibility of application in real life and industrial field, various experiments were implemented such as performance test, glass transportation with robot arm, fabrication of metal narrow wire, and experiment for detecting contaminants in the air. With these studies, these developments could be expected to contribute to utilizing micro/nano structure fabrication system.

UNIX 시스템의 보안 검사 도구 설계

이성호 부경대학교 2000 국내석사

(A) Catalytic Study on the Effective Utilization and Conversions of C1 a Materials; Methane-Dry Reforming, Methane Combustion,and Preferential Oxidation of CO in H₂-rich Reformate

이성호 고려대학교 대학원 2002 국내박사

For the effective utilization and conversion of C1 material, three different catalytic systems were considered in this thesis; methane-dry reforming, catalytic combustion of methane, and preferential CO oxidation. Currently, the issue for the methane-dry reforming catalyst is to overcome the coking, which deactivates the catalyst during the reaction. Therefore, it is tried to solve the problem developing the anti-coke catalysts with various types of Labased perovskites. Perovskite-type oxides suc h as La_(1-x)Sr_(x)CoO₃, La_(1-x)Sr_(x)NiO₃ and La_(2-x)Sr_(x)NiO₄ catalysts were tested for the methane-dry reforming. They were transformed during methane-dry reforming to a stable and highly effective catalytic system of well-dispersed Ni over metal oxides. The transformation was subjected to the type of perovskite and the amount of Sr-substitution, which resulted from the removal of lattice oxygen by Sr-substitution promoted by the reducing atmosphere of the reaction (CH₄/CO₂ = 1). When La_(0.9)Sr_(0.1)NiO₃ and La_(1.8)Sr_(0.2)NiO₄ were used as starting catalyst, the highest catalytic activity was obtained without coke formation. The reaction over these catalysts is considered to proceed by the catalytic reaction of CO₂ adsorbed on La₂O₃ and activated CH₄ over well dispersed Ni sites. Also, the perovskite-type catalysts were inspected for the methane combustion. The focal point of the catalyst development was to establish the preparation methods of catalysts with high surface area, which can be adapted to the wide temperature range. At first, Using the citrate precursor and spray-freezing/freezedrying, LaCoO₃ catalyst with high surface area, 20.0 ㎡/g, could be prepared at 800℃ calcination temperature. Its surface area is the highest value among LaCoO₃ catalysts reported up to date and also the catalyst showed the highest activity for the methane combustion among the catalysts prepared in this study. Therefore, it is thought that the preparation method of perovskite for