저항을 이용한 프로판-공기 혼합가스의 점화한계 개선에 관한 연구

이춘하,오종용,옥경재,지승욱,이광식,심광렬 한국화재소방학회 2004 한국화재소방학회논문지 Vol.18 No.1

본 논문은 IEC형 불꽃점화 시험장치를 이용하여 저압 유도회로의 최소 점화한계를 프로판-공기 5.25 Vol.%의 혼합 가스에 대하여 실험적으로 구하였으며, 또한 유도회로의 인덕턴스 L에 안전소자로서 저항을 병렬접속하였을 경우 프로판-공기 5.25 Vol.%의 혼합 가스에 대한 점화한계 개선효과를 관찰하였다. 그 결과, 최소 점화한계는 전류의 크기에 따라 좌우되었다 또한, 전원으로부터 공급되는 에너지는 인덕턴스에 우선 축적되고. 그 초과분의 에너지가 폭발성 가스의 점화원으로 작용하였다. 점화한계 개선효과는 인덕턴스가 300 mH일 때, 최고 330%의 개선효과가 나타났으며 인덕턴스가 클수록 점화한계 개선효과가 크게 나타났다. 또한 병렬로 접속한 저항의 크기가 적을수록 점화한계 개선 효과가 크다. 본 연구결과는 본질안전 방폭형 전기기기의 연구개발을 위한 기본자료로 활용할 수 있을 뿐만 아니라 이들 기기의 방폭성능에 대한 시험자료로도 활용이 가능할 것으로 사료된다. This paper describes the minimum ignition limits for propane-air 5.25 Vol.% mixture gases in low voltage inductive circiuts. The improved effects on the ignition limit are studied by parallel safety components(resistors) for propane-air 5.25 Vol.% mixture gas in low voltage inductive circuits. The experimental devices used in this test are the IEC type spark ignition test apparatus. The minimum ignition limits are controlled by the values of current in inductive circuit. Energy supplied from elect source is first accumulated at the inductance, it's extra energy is working as ignition source of the explosive gas. The improved effects on the ignition limit are respectively obtained as the maximum rising rate of 330% by composing parallel circuits between inductance and resistor as compared with disconnecting inductance with the safety components. The more values of inductance increase the higher improved effects of ignition limit rise. The less values of resistor the higher improved effects of ignition limit rise. It is considered that the result can be used for not only data for researches and development of intrinsically safe explosion-proof machines which are applied equipment and detectors used in dangerous areas but also for datum for its equipment tests.

모빅 캡슐(멜록시캄 7.5㎎)에 대한 멜락스 캡슐의 생물학적동등성

이예리,염승복,고연정,고정길,김호현,이희주,이경률 한국약제학회 2004 Journal of Pharmaceutical Investigation Vol.34 No.5

A bioequivalence of Melax capsules (Chong Kun Dang Pharm., Korea) and Mobic™ capsules (Boehringer Ingelheim Korea) was evaluated according to the guideline of Korea Food and Drug Administration (KFDA). Single 15 mg dose of meloxicam of each medicine was administered orally to 24 healthy male volunteers. This study was performed in a 2 x 2 crossover design. Concentrations of meloxicam in human plasma were monitored by a high-performance liquid chromatography. AUC, (the area under the plasma concentration-time curve from time zero to 72 hr) was calculated by the linear trapezoidal rule method. C_(max) (maximum plasma drug concentration) and T_(max) (time to reach Cma,.) were compiled from the plasma concentration-time data. Analysis of variance was performed using logarithmically transformed AUC, and C_(max). No significant sequence effect was found for all of the bioavailability parameters. The 90% confidence intervals of the AUCt ratio and the C_(max) ratio for Melax™/Mobic™ were 0.95 - 1.04 and 0.98 - 1.14, respectively. This study demonstrated a bioequivalence of Melax™ and Mobic™ with respect to the rate and extent of absorption.

ON THE NOTIONS, OPERATIONS, AND PROPERTIES OF CATEGORIAL GRAMMAR

李承烈 한국항공대학교 1990 論文集 Vol.28 No.-

본 논문은 영어 문장을 수행 모델의 입장에서 분석한 범주문법의 기본 개념, 도출과정을 분석.검토하고 그 기본적인 특성을 밝혔다. 본 논문에서는 기존 연구에서 제안된 함수 분석, 함수 합성 또 범주상승은 인정하였으나 함수 교체 대신 범주 통합을 제안하고 또 등위 접속 대신 확대 등위 접속을 제안하고 이런 연산 규칙이 타당성이 있음을 밝히고 이에 따라 문제가 되는 문장들을 분석.도출하였다. 또 범주 문법에서 다루고 있는 모든 개념들이 갖고 있는 특성도 밝혔다.

담화표상구조 내에서 문연결 : 특정성과 의미 승계를 중심으로

이승렬 한국항공대학교 1996 論文集 Vol.34 No.-

The purpose of this article is to identify the semantic connections between sentences. In particular, it focuses on the specificity of indefinites and the anaphoricity of anaphora. It also argues against their uniqueness hypothesis. In order to defend their anaphoricity, we propose the information discourse representation structures which include lexical meaning, specificity, and context information. Using this framework we investigate the anaphoricity in discourse representation structures. The summary of each section is as follows: In section two we review the characteristics of sentence connections. We also argue for the need for their anaphoricity. section three deals with the information discourse representation structures. It concerns with the representation of context information in detail. So we propose that specificity of indefintes be represented in the conditions of discourse referents. In section four we apply the information discourse representation structures to the information discourse structures, showing their anaphoricity. The significant discovery is in explaining sentence connections in term of anaphoricity.

담화표상구조에서 함의 영역

이승렬 한국항공대학교 1994 論文集 Vol.32 No.-

The purpose of this paper is to review and establish the semantic representation in respect to Discourse Representation Theory(DRT). The theory is aimed to explain the semantics of discourses. However, it cannot identify the meaning of discourses such as propositional anaphors and elliptical expressions. The insufficiency results from the structures of Discourse Representation Structures whose components are discourse world and conditions. In order to treat the defects. DRSs are needed to revised. In this approach we propose that propositional domain should be included in the discourse world. The domain contains propositions of the semantic representation of discourses. They can relate the propositional anaphors to their referents in DRSs without violating accessibility. Also, the proposal can deal with elliptical discourses.

담화표상구조에서 주제표시

이승렬 한국항공대학교 1993 論文集 Vol.31 No.-

The purpose of this paper is to review the construction rules for the discourse representation structure and to establish a well-supported framework of the structure. First we find out some problems in Kamp's discourse representation structure in respects of processing steps, discourse representation for relative clauses, and selecting anaphoric antecendents. To solve the problems we argue for establishing a new level in the representation : that for a topic marker. By placing it between principal DR and sub-DR we show that the processing steps proceed in universal directions : from top to down and left to right. We can distinguish relative clauses from simple sentences distinctively by placing antecedents in higher DR for the topic marker. Also, we identity the right way to select a suitable referent for a pronoun among various referents.

한정 명사의 의미결속

李承烈 한국영어교육연구학회 1996 영어교육연구 Vol.- No.16

The purpose of this article is to identify the semantic binding of definite description. In particular, it focuses on the argument for the anaphoricity of the definites. It also argues against their uniqueness hypothesis. In order to defend their anaphoricity, we propose the information discourse representation structures which include lexical meaning, specificity, and context information. Using this framework we investigate the anaphoricity of definites. The summary of each section is as follows: In section two we review the uniqueness of the definites. We also argue for the need for their anaphoricity. Section three deals with the information discourse representation structures. It concerns with the representation of context information in detail. So we propose that specificity of indefintes be represented in the conditions of discourse referents. Then, we establish the level for the implicit lexical meaning in the structures. In section five we apply the definites to the information discourse structures, showing their anaphoricity. The significant discovery is in explaining a variety of definiteness in term of anaphoricity. In particular, we explain the definiteness of similar semanitic lexical items as a relation between part and situation, not part and whole.

전두골간단 이형성증 치험례

이승렬,정지원 大韓成形外科學會 1999 Archives of Plastic Surgery Vol.26 No.3

Frontometaphyseal dysplasia is an uncommon genetic syndrome affecting bone and connective tissue. This condition is characterized by the prominence of supraorbital ridges, hyperostosis of the skull, mandibular hypoplasia and malocclusion with antegonial notching, underdeveloped paranasal flaring of the long bone, and a widened iliac wing. Frontometaphyseal dysplasia has an X-linked dominant trait. Clinical manifestations are more severe in males and have extreme variability in females. We present an 11-year -old boy who had frontometaphyseal dysplasia with disfigured face due to bilaterally urinary tract malformation and chronic urinary tract infection. To improve facial appearance, his prominent supraorbital ridges were contoured by ostectomy and burring through bicoronal incision. Urologic operation was performed simultaneously. Histologically, resected bony specimen revealed bony tissue with normal trabecular pattern suggesting exostotic bone. The patient healed without any postoperative complications and he and his parents were satisfied with his final facial morphology.

초고속 광대역 파장 가변 광섬유 링 레이저 구현

이정렬,이승우,엄진섭 강원대학교 정보통신연구소 2002 정보통신논문지 Vol.6 No.-

In this paper, we demonstrate a tunable wavelength erbium-doped fiber ring laser. It's tuning interval can be controlled as fine as hundreds of picosecond by using a tunable filter of Fiber Reflection Mach-Zehnder Interferometer with gain-transparent SOA within one arm. And a wavelength tuning range over 17㎚ can be achieved by adjusting the power of 1310㎚ pump light into SOA. Narrow linewidth less than 0.08㎚ and SMSR of more than 30dB is obtained with single-mode operation.

슬러지 재자원화에 관한 연구

이주성,공성호,서승원,배성렬,김영채,이기철 漢陽大學校 環境工學硏究所 1997 環境科學論文集 Vol.18 No.-

이 연구는 1993년도에 우리나라의 연간 슬러지발생량이 약 3500만m³에 이르고 있으며, 이들 대부분이 매립되고 있다. 그러나 매립부지의 확보가 점점 어려워 지고 있으며 아울러 매립처분비용도 상승하고 있기 때문에 oil화, 퇴비화등으로 재자원화 하는 방법과 소각후의 소각회를 유효이용하는 방법 등이 연구 개발되고 실용화되고 있다. 슬러지의 oil화는 현재 연구단계에 있으나 앞으로 슬러지의 유효이용기술로서, 가장 좋은 방법이 되리라 기대되고 있다. 그러나 소각후의 소각회의 이용방법은 현재 일본등에서는 실용화 되어 건설자재 등으로 다양하게 이용하고 있다. 우리나라에서도 서울시 등을 비롯한 대도시에서는 하수처리장에서 발생하는 슬러지를 소각한 후에 소각회를 건설 자제용으로서 지자체의 공사에는 반드시 사용하도록 하는 제도를 만든다면 유효이용방법으로 충분한 타당성이 있을 것이다. 이때 소각방법으로는 용융소각방법이 보다 효과적일 것이다. With increasing sewage and wastewater sludge, it has become difficult to dispose the sludge by landfilling and ocean dumping. To solve this problem, efforts have been made to delelop sewage and wastewater sludge utilization technologies in many advanced countries. Some technologies have already been developed; conversion of sludge to compost and fuel, producing artificial light-weight aggregate from ashes. This paper describes the technical status of sludge utilization technologies.