P-605 : Preparation and characterization of Mn/Na2WO4 catalyst

송훈,송요순,조성준 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2

Methane has drawn much attention as a clean energy in near future. Chemical conversion of methane as valuable chemical feedstocks are also important for petrochemical industry. The Mn/Na2WO4/SiO2 or MgO catalysts are well known for oxidative coupling of methane at 1073-1173 K. C2 product yield was limited to 16% (80% conversion and 20% selectivity). Typical Mn/Na2WO4/SiO2 has low surface area, ~ 1 m2g-1. Thus, increasing the active surface area can be an alternative to enhance the catalytic performance of the Mn/Na2WO4. In the present work, Al(Mg)O has been utilized as a support for the Mn/Na2WO4. The catalyst supported Al(Mg)O has been prepared by incipient wetness method. The surface area of the obtained catalyst was extremely large, 37 m2g-1 compared to that of the supported catalyst on SiO2, 0.05 m2g-1. This difference comes from the catalytic sintering of SiO2 by Na+. The result of XRD patterns indicates that there is large agglomerates of MnWO4, MnO etc in the silica-supported catalyst. However, it seems that the catalytic entity was well dispersed on the Al(Mg)O support, which can be beneficial for the catalytic conversion of methane to C2 products. The details of characterization of the catalysts will be presented.

EVA, EVCL 분말수지와 플라이애시를 혼입한 시멘트 모르타르의 고온특성

송훈,신현욱 한국건설순환자원학회 2018 한국건설순환자원학회 논문집 Vol.6 No.4

3D printing technology of construction field can be divided into structural materials, interior and exterior finishing materials, and is mainly done by extruding and adapting. Particularly when it is applied as an exterior materials, it is mainly applied to an unstructured exterior materials and high accuracy is required. The exterior materials can be used as a cement composite materials, it is suitable also for a additive type manufacturing, and the role of a redispersible polymer powder is important. But, high temperatures, redispersible polymer cement base material beget dehydration and micro crack of cement matrix. In this research, we developed a EVA, EVCL redispersible polymer cement base material applicable as a 3D printing exterior materials, confirmed density and strength characteristics for application as an exterior materials, a flame retardancy test for improving the fire resistance of buildings and confirmed its possibility. From the test result, developed EVCL redispersible polymer cement mortar showed good stability in high temperatures. These high temperature stability is caused by the ethylene-vinyl chloride binding. Thus, this result indicates that it is possible to fire resistant 3D printing interior and exterior finishing materials.

Relationship between GMI and Barkhausen Noise in an Ion-irradiated Amorphous Ribbon

송훈,박덕근 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.22

The mechanism for the abrupt increase in the giant magneto impedance (GMI) ratio in an ion-irradiated Co-based amorphous ribbon has been investigated. The GMI ratio is considerably increased in the ion-irradiated samples, and the GMI response shows a strong dependence on the driving frequency. For the Ar-ion-irradiated sample, the Barkhausen noise (BN) signals increases with increasing ion dose. The power spectrum density of the BN increases with increasing ion bombardment dose. The results are interpreted on the basis of radiation damage and domain wall dynamics.

Dependence of the Giant Magnetoimpedance on Electron Irradiation for Bio-sensor Design

송훈,박덕근 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.10

The effects of electron irradiation on a giant magnetoimpedance (GMI) have been investigated for a Co-based amorphous ribbon. The GMI ratio was used to characterize the samples before and after the electron irradiation. The GMI ratio increased considerably in the electron irradiated samples and the GMI response showed a strong dependence on the irradiated electron irradiating time and driving frequencies. It was shown that the electron irradiations lead to a substantial modification of the magnetic properties. Our studies indicate that low energy election irradiation is useful for improving the magnetic GMI, which is of practical importance for the development of high –performance bio magnetic sensors.

포타슘 실리케이트계 콘크리트 표면보호제의 내구특성

송훈 청운대학교 건설환경연구소 2015 청운대학교 건설환경연구소 논문집 Vol.10 No.2

Most concrete contains capillary voids, therefore, chemical transport will invariably be affected by the interaction between concrete surface and environmental chemical attack. Also, concrete is a porous materials containing moisture and damage under repeated cycles of freezing and thawing. Concrete can therefore be more durable by applying surface protection to increase its durability using concrete impregnant, which are normally classified alkali silicate materials. Thus, this study is concerned with elevating the carbonation and Cl- penetration, freezing and thawing resistance of concrete structures by applying potassium silicate. From the research result, Potassium silicate is effective for the concrete impregnant. 콘크리트 표층부의 열린 공극은 내부로 연결되며 외부의 환경요인에 의해 영향을 받아 내구성능이 저하한다. 콘크리트 표면보호제는 표층부로부터 함침시켜 열린 공극 등의 개질을 목적으로 사용하며 주로 알칼리 실리케이트계 재료가 사용된다. 본 연구에서는 콘크리트 침투성 표면보호제로서 포타슘 실리케이트를 사용하여 콘크리트 표면보호제를 제조하였다. 또한 제조된 표면보호제의 적용을 위한 탄산화 및 염해 저항성, 동결융해 저항성 등의 내구성능에 대해 검토하였다. 실험 결과 포타슘 실리케이트계 콘크리트 표면보호제는 내구성능 개선에 유리하고 충분한 적용 가능성을 보였다.

시론

송훈 한국외국어대학교 동양어문대학(용인) 1988 동양 Vol.1 No.1

한일 강제병합 이후의 미 북감리교 선교의 위기: 빅터 채핀(Victor D. Chaffin)의 예를 중심으로

송훈 한국교회사학회 2022 韓國敎會史學會誌 Vol.62 No.-

구한말 조선땅에 들어온 미 북감리교회 선교는 순회전도와 기관선교를병행하며 조선의 근대화와 복음전파에 매진했다. 이러한 그들의 노력으로정동교회와 같은 개신교회의 설립과 이화학당, 배재학당 등을 설립하였고, 보구여관과 같은 여성들을 위한 의료기관을 설립하여 조선근대화와 복음화에 공헌하였다. 하지만 미국 북감리교회 선교는 1910년을 거치면서 커다란 위기에 직면하게 된다. 이러한 위기의 배경에는 기관선교의 강조와 제대로 작동하지 않은 순회전도 방식의 한계가 존재했음을 증명하고자 한다. 현지인 평신도 리더십이 확고하게 세워지지 않은 상태에서의 순회전도는공동체의 결속력의 약화와 함께 지속 가능한 성장이 불가능하다. 또한 현지에서의 재정이 확보되지 않는 한 선교 파송지의 지원에 의존하게 되어재정확보의 불확실성이 커지게 되는 부작용이 나타나게 된다. 이러한 1910 년대 북감리교회 선교부의 위기는 조선에 들어온 젊은 감리교 목사 빅터채핀의 힘겨웠던 삶에 투영되며 세계선교의 유례없는 성공으로 평가된 조선선교의 뼈아픈 교훈을 남겨주게 되었다.

독일통일과정에서의 동서독교회의 역할을 통해 본 북한 교회 세우기의 과제

송훈 기독교학문연구회 2022 신앙과 학문 Vol.27 No.2

The unification of Germany in 1990 was a monumental event for world peace and reconciliation, followed by the collapse of the Soviet Union and a relevant and promising model for peace and the unification of the Korean peninsula. Moreover, The churches in the West and East Germany cooperated to ensure the unity of German churches and increased people's hope for national unification and peace. The exemplar endeavors of German churches had shown the responsibility heavily raided upon Christians' shoulders for peace and reconciliation. However, German churches in the age of the new Millenium have been facing challenges of conflicts between people had lived in the West and the East and a strong wave of secularism. These conflicts show how hard it is to achieve people's integrity after political and economic unification. Also, the leaning of churches in the old East regions shows how ideology can cleanse people's religiosity even after the decline of the communist regime. Hence, it is needed to critically analyze the roles of churches during and after the German unification to present a new idea of missions toward North Korea from a missional perspective. This paper aims to provide historical evidence that missions toward North Korea should be an integral mission for the well-being of North Koreans based on evangelical efforts to build Christian communities in the North from this critical assessment of the German case. 독일의 통일은 과거 냉전시대 강대국들의 이념갈등의 장벽을 무너뜨린 사건으로 기록되어 비슷한 상황에 놓여있는 남북한 사회에게 희망과 역사적 교훈으로 여겨지고 있다. 심지어 독일통일과정에서 동서독 교회가 보여주었던 통일과 화해, 일치를 위한 노력들은 남북한 교회가 통일을 위해 감당해야할 역사적 책무와 사역의 방향성을 제시해주고 있다. 하지만 통독 이후에 구 동독지역에서의 동서 갈등은 여전히 진행 중이며, 과거 독일 통일의 주역이었던 동독교회는 이러한 갈등 속에서 교인들의 이탈과 주민들 사이의 비종교화의 도전 속에서 또 다른 위기를 겪고 있다. 이러한 구동독지역의 상황을 볼 때 통일에 이르는 과정뿐만 아니라 사회 통합의 과제 또한 매우 중요함을 배울 수 있다. 그리하여 통일과 사회통합이라는 민족적 과제를 마주하는 우리는 통일과정에서의 동서독교회의 역할을 비판적으로 고찰하고 이를 바탕으로 새로운 선교적 교회의 측면에서 북한 교회 세우기의 방법론을 재고할 필요성을 인식하게 되었다. 과거 북한 교회 재건을 목표로 한 북한선교의 복음의 일방성에 한계와 디아코니아 기관을 통한 선교를 분리되어 바라볼 것이 아니라 함께 진행되어야 할 선교적 과제로 인식한다. 그리하여 본 논문은 이러한 연구 목적 하에 북한 교회 세우기는 복음전도를 기반한 사회적 섬김의 방향성을 가져야 함을 주장하며 이를 역사적 연구를 통해 증명하고자 한다.

高强度콘크리트의 細孔構造 變化와 加熱溫度와의 相關性

송훈,이세현,이종찬 대한건축학회 2006 大韓建築學會論文集 : 構造系 Vol.22 No.9

This work involves investigating the correlation between variation of pore structure and heating temperature of high strength concrete using silica fume. Dehydration and micro crack thermal expansion occur in cement hydrates of concrete structure heated by fire. Porosity difference due to both the dehydration of cement hydrates and pore solution causes and influences changes in the properties of materials. Based on the results of this study, the following can be summarized:1. Compressive strength, elasticity modulus and poisson's ratio were degraded depending on a rise of heating temperature. 2. Porosity and distribution of pore radius were remarkedly affected by micro filling effect of silica fume and different water-binder ratios.3. High temperature caused the increase of porosity, which resulted from the reason that evaporable water in gel or capillary poresas well as chemical bound water was eliminated from hardened cement paste due to the dehydration of C-S-H and Ca(OH)2.

Self-cleaning 침투성 함침제의 적용에 따른 타일 및 콘크리트 표층부의 개질특성

송훈,전찬수,김영호 한국디지털건축·인테리어학회 2013 한국디지털건축인테리어학회 논문집 Vol.13 No.4

Concrete structure is not the only material vulnerable to physical and chemical processes of deterioration associates with severe conditions. Deterioration of the concrete structure, however, occurs more progressively from the outside of the concrete exposed to severe conditions. Especially, Carbonation, chloride ion attack is more important factor of concrete durability. This study is interested in manufacturing the self-cleaning concrete surface impregnant including TEOS, lithium silicate for the repair of the exposed concrete surface and the color concrete requiring the advanced function in view of the concrete appearance. Form the results, TEOS and lithium silicate are very effective that increasing the concrete durability using self-cleaning concrete impregnant. Self-cleaning concrete impregnant specimens is satisfied with performance requirement of KS standard in adhesion test in tension but the reinforcement of concrete substrate is slight. So, the self-cleaning concrete impregnant of this study is more desirable for the improvement of durability rather than the reinforcement.