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      • 패턴 매칭에 의한 한글 자연언어 질의 구문 중의성 해결에 관한 연구

        송재관,박찬곤 청주대학교 산업과학연구소 1997 産業科學硏究 Vol.15 No.2

        It will be very convenient to use queries of the natural languages in human-machine interface. It takes three steps to transfer natural language sentence into query sentences; morpheme analysis, syntax analysis, and the production of pattern queries. Syntax analysis plays the most important role in the process of production of pattern query. So far, general syntax analyzers or modified syntax analyzers for specific applications have been used for this purpose. The problem is, however, that the former lacks the temporal-spatial efficiency and the latter generality. The purpose of the study is to show a method that can elevate the temporal-spatial efficiency in syntax analysis and contribute to solving the ambiguity of Korean natural language syntax, by using the modified sentence patterns from korean corpus.

      • SCIESCOPUSKCI등재
      • KCI등재

        How Does the Left Ventricle Work? Ventricular Rotation as a New Index of Cardiac Performance

        송재관 대한심장학회 2009 Korean Circulation Journal Vol.39 No.9

        Although simple cylindrical or ellipsoidal left ventricular (LV) geometry with transverse or circumferential muscle contraction has been traditionally used to estimate LV performance, the estimated LV ejection fraction (EF) with muscle fiber shortening up to 20% is less than 50% of maximum, which is lower than the normal EF observed in routine clinical practice. Thus, oblique fiber orientation and LV rotation, in addition to radial thickening and longitudinal shortening, is predicted as an essential component of effective LV pumping. This was confirmed by animal experiments using surgically implanted markers or invasive sonomicrometry. Demonstration of the muscle band extending from the pulmonary artery to the aorta, which connects the ventricular myocardium, both right ventricle and LV as a continuous band (muscle band theory) provides an anatomical backbone of helical configuration of the cardiac muscle band with descending and ascending segments wrapping the LV apex. Moreover, sequential, non-simultaneous, activation and contraction of the helicoids muscle band contributes to LV rotation or twist motion. Recently, magnetic resonance imaging and speckle tracking echocardiography (STE) techniques have provided an excellent noninvasive way to measure LV rotation and twist, which is expected to contribute to a more thorough evaluation of both LV systolic and diastolic function. Initial animal experiments showed that quantification of apical rotation or LV twist using STE is more accurate for estimating LV systolic function than conventional EF under a variety of LV inotropic conditions, irrespective of coronary ligation. As de-rotation or the untwisting rate can also be measured by STE, the role of ventricular untwisting as a temporal link between LV relaxation and suction can be addressed. Further clinical investigations are needed to determine the real clinical impact of these new indices of LV mechanical function. Although simple cylindrical or ellipsoidal left ventricular (LV) geometry with transverse or circumferential muscle contraction has been traditionally used to estimate LV performance, the estimated LV ejection fraction (EF) with muscle fiber shortening up to 20% is less than 50% of maximum, which is lower than the normal EF observed in routine clinical practice. Thus, oblique fiber orientation and LV rotation, in addition to radial thickening and longitudinal shortening, is predicted as an essential component of effective LV pumping. This was confirmed by animal experiments using surgically implanted markers or invasive sonomicrometry. Demonstration of the muscle band extending from the pulmonary artery to the aorta, which connects the ventricular myocardium, both right ventricle and LV as a continuous band (muscle band theory) provides an anatomical backbone of helical configuration of the cardiac muscle band with descending and ascending segments wrapping the LV apex. Moreover, sequential, non-simultaneous, activation and contraction of the helicoids muscle band contributes to LV rotation or twist motion. Recently, magnetic resonance imaging and speckle tracking echocardiography (STE) techniques have provided an excellent noninvasive way to measure LV rotation and twist, which is expected to contribute to a more thorough evaluation of both LV systolic and diastolic function. Initial animal experiments showed that quantification of apical rotation or LV twist using STE is more accurate for estimating LV systolic function than conventional EF under a variety of LV inotropic conditions, irrespective of coronary ligation. As de-rotation or the untwisting rate can also be measured by STE, the role of ventricular untwisting as a temporal link between LV relaxation and suction can be addressed. Further clinical investigations are needed to determine the real clinical impact of these new indices of LV mechanical function.

      • SCIESCOPUSKCI등재
      • KCI등재

        초음파(超音波)에 대한 ICR Mouse 착상전기(着床前期)의 개체(個體) Level 영향(影響)(기형(奇形).배사망.(胚死亡))으로부터 초음파(超音波)의 물리학적(物理學的) 특성(特性)에 대한 연구(硏究)

        송재관,김예현,Song, Jae-Kwan,Kim, Ye-Hyun 대한방사선과학회 1995 방사선기술과학 Vol.18 No.2

        Embryos and fetuses are more sensitive to various environmental agents than adults of children biological effects following the exposure, such as intrauterin, malformation, have intimate conception with the prenatal exposure. There have been many studies on radiation and other agent. However, imformation about the ultrasound effects is limited. It is very important to study the effect of ultrasound with these kinds of fatera in consideration of ultrasound protection and safty. In this study, embryonic and fefal effects of ICR mouse embryos irradiated on 24, 48, 12 and 192 hpc of preimplantation and organogenesis period at the intensity of $0.5{\sim}3\;W/cm^2$ were investigated. Many type of external malformation observed in mouse irradiated on 72 hpc and 192 hpc. However, the embryos irradiated on 24 hpc and 48 hpc, at witch embryos had less then 6 cells and were pre-compaction stage, had no sensitivity for external malformation. The threshold doses of external malformation in mouse irradiated on 72 hpc and 192 hpc, at which embryos were consisted of $16{\sim}32$ cells and neural formation stage, were $1\;W/cm^2$ and $0.5\;W/cm^2$.

      • 우편물 무인접수 서비스 방안 연구

        송재관,김동호,나동길 대한산업공학회 2012 대한산업공학회 춘계학술대회논문집 Vol.2012 No.5

        현대인의 경제활동 증가와 함께 우편산업도 많은 변화를 겪고 있다. 우체국에 접수된 우편물의 표리정리부터 차량 운송, 기계구분으로 이어지는 일련의 내부 프로세스는 물론이고 우편물의 접수 및 배달 시스템도 지금보다 더 다양하고 편리한 시스템을 개발하여 보급함으로서, 우편사업 환경 변화에 능동적으로 대처해야 한다. 이를 위해 상용화된 소량우편물 접수용 무인우편창구 외에도 소·다량 규격우편고객을 겨냥한 무인접수 시스템 및 비규격우편물접수용 장비 등 무인접수 시스템을 개발하여 상용화 하고, 더 나아가 무인우편코너를 공공장소에 설치하여 경제활동인구의 우편접수 편리성을 제고함으로서, 우편처리원가를 절감하여 궁극적으로는 대 국민 우편서비스 향상을 기해야 할 것이다. 본 논문은 이러한 시대적 상황 요청에 대비하고 있는 국.내외 무인 우편접수 시스템 운영현황을 살펴보고 향후 장비를 개발하고 서비스 할 수 있는 방향을 제시하고자 한다.

      • KCI등재
      • 기계번역을 위한 한국어 특징에 관한 연구

        송재관,우근신,박찬곤 청주대학교 산업과학연구소 1999 産業科學硏究 Vol.17 No.1

        Morphological analysis is the first work in a natural language processing. Classification of part-of-speech in morphological analysis is surely necessary. There are many researches about it. But, because standard of the classification of part-of-speech is various, it doesn't have consistency. So, syntactic structure of the Korean language is expressed complicatedly, and it declines the efficiency about a machine translation. This study extracts a morphological feature to appear in a part-of-speech tagging with unique standard. it suggests an algorithm of automatic part-of-speech tagging. This algorithm can extract a syntactic structure of the Korean language and minimize the difference of syntactic structure with object language to machine translation. The syntactic structure extracted can form a sentence pattern of object language to machine translation.

      • 문장패턴을 이용한 형태소분석시스템에 관한 연구

        송재관,박찬곤 청주대학교 산업과학연구소 2001 産業科學硏究 Vol.19 No.1

        Morpheme ana1ysis in natural language processing is first process and is analyzed differently by application domain The morpheme analysis at this paper is used to machine translation and used a sentence pattern sentence pattern provides useful information needed to machine translation. So, morpheme analysis used sentence pattern is efficient to machine translation because it can be reduced semantic analysis process. and provide sentatic information

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