최대/최소 경계 스키마 추출 기법을 이용한 XML 문서의 DTD 추출

박경현,최은선,이종연,박정석,류근호 충북대학교 컴퓨터정보통신 연구소 2000 컴퓨터정보통신연구 Vol.8 No.2

XML이 인터넷상의 데이터 교환의 표준으로 대두되면서 데이터 모델이나 플랫폼에 관계없이 데이터의 전송이 가능하게 되었다. 특히 데이터 중심의 XML 문서의 경우 전송시의 부하를 줄이기 위해 DTD없이 전송되는 경우가 일반적이다. 그러한 이유로 전송받은 XML 데이터의 저장 효율을 높이고 질의를 최적화하며 사용자에게 편의성을 제공해주기 위해서는 XML 데이터로부터 DTD 추출이 필수적으로 요구된다. 이 논문에서는 이러한 DTD를 추출하기 위해 반구조적 데이터의 스키마 추출 기법을 적용한다. 특히, 반구조적 데이터의 최소 경계 스키마를 추출하는데 데이터로그를 이용하는 기존의 방법보다 효율적인 방법인 시뮬레이션을 적용함으로써 보다 향상된 DTD 추출 기법을 제시한다. XML makes it possible for data to be exchanged regardless of the data model in which it is represented or the platform on which it is stored, serving as a standard for data exchange format on the internet. Especially, It is natural to send XML data without DTD on the internet when XML is data-centric XML. Therefore it is needed to extract DTD to store XML data efficiently, to optimize queries, and to help users browse XML data. In this paper, Techniques for upper/lower bound schema extraction are applied to extract DTD from XML data. Especially we propose an efficient technique for extracting DTD by using simulation which is better than datalog as a lower bound schema extraction method.

전기설비에서의 고조파 영향분석과 저감대책에 관한 연구

박석훈,유인근 창원대학교 산업기술연구소 2001 産技硏論文集 Vol.15 No.-

In recent years there has been an increasing usage of switching devices such as SCR, IGBT, Power TR and etc, in home appliances and industrial machinery. A lot of harmonics are generated through the switching processes, which cause considerable harmonic distortion in the network and may result severe damages to the precise power equipments. This work presents the performance characteristic of digital watt-hour meter under the harmonics of voltage and current. Each waveform involved is different in magnitude, phase, and THD(Total Harmonic Distortion). It is possible to generate harmonics and control those waveforms using RTDS. Tests were performed on a selected sample of three-phase digital watt-hour meter which is coupled with data acquisition system via RS 485/232 converter. The percentage error rate of the watt-hour meter is compared for both sinusoidal and non-sinusoidal cases and the results are given. This paper also deals with observations of events that occur in the Dimmer circuits and phase control which could affect harmonics problem to the commercial power system. In order to reduce the effect of harmonics and design filters, Solid State Relay Dimmer(SCRs or TRIACs) and Noise Filter are described, and the effects of harmonics is also analyzed.

김해시 가로수의 생육환경개선에 관한 연구

박태근,김석규,김승환 동아대학교 건설기술연구소 2000 硏究報告 Vol.24 No.1

The purpose of this study is to investigate growth environment of street trees planted on main roads in Kimhae city. The results of investigation that soil hardness, soil acidity, vitality classified by characteristic of area are as follows ; The results of soil hardness classified by residential area(A area), commercial area (B area), industrial area (C area) are as follows; A section 20.7㎜, B section 17.9㎜, C section 13.4㎜. Soil hardness of investigative areas are satisfactory, but it needs to establish of tree-grate for healthful growth of street trees. The results of soil acidity classified by residential area(A area), commercial area (B area), industrial area (C area) are as follows ; A section pH 5.42, B section pH 4.28, C section pH 3.89, B, C areas are investigated extreme acidity, so it needs to improve of the soil structure.

한국의 유럽투자에 대한대안적 접근

박석근 인제대학교 1998 仁濟論叢 Vol.14 No.2

To date, there has been a variety of research on Korea's investment in Europe. Firstly, Bloom(1997) focused on the topic in relation to Korean firms' globalisation strategy and Lee(1991) and Sung(1997) each looked at the Korean firms response to regionalisation. Secondly, Jung(1997) argued that the motivations of Korean manufacturing investment in the European Union varied markedly, highlighting the interplay between global and local factors. Finally, a group of Korean researchers(Jun(1987 and 1991) ; Ju(1990) ) have developed 'the structual market defence approach' to explain the Korean firms' investment behaviour in developed countries. They argued that the Korean firms invested in North America in attempt to maintain their own share in the host country's market with no firm-specific advantage. Following the existing research, however, it would be more difficult for us to properly explain the reason why Korea's investment has spread geographically to whole European areas in the 1990's. Additionaly, the conventional theories are quite incapable of explaining the interrelationships between the current Korean crisis and the change in Korea's investment in Europe. In other words, there has been no in-depth research, which has tried to explain the potential and limits of Korea's investment in Europe focusing on the characteristics of the 'chaebol'. In approaching the subject of Korea's investment in Europe, there are supposedly at least two difficulties. One is a theoretical problem and the other is a practical one. Specifically, we have firstly to solve the problem of how Korean companies, with no distinctive firm-specific advantage, could have invested in the developed European areas. Then, to address the second problem, we have to provide a proper link between the current Korean economic crisis and the on-going change in Korea's investment in Europe so far. In this paper, we have tried to search for the conceptual key which could unlock the two problems. Doing the work, we concluded that the key lies in Korea's quite unique business group, the 'chaebol', whose characteristics could link every problem we are facing. We therefore, tried to clarify Korea's investment in Europe especially focusing on the 'chaebol system', and how it was established and has developed since 1960's by the intervention of the Korean government.

LDI(LCD driver Ic)의 응답 시간을 향상시키기 위한 선행 강조 구동 회로 설계

박근형, 손홍희, 정인석 충북대학교 컴퓨터정보통신연구소 2008 컴퓨터정보통신연구 Vol.16 No.1

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마늘成分이 肝 Glutathione S-Transferase 및 Glutathione peroxidase 活性에 미치는 影響

朴鍾珉,李相日,金善業,許瑾,金碩煥,徐赫珪 嶺南大學校 環境問題硏究所 1985 環境硏究 Vol.5 No.2

Garlic (Allium sativum L.) is a widely distributed plant used in all parts of the world not only as a spice but also as a popular remedy for several thousand years Recent studies have shown that garlic components may regulate the many metabolism in liver. Therefore, the present work was undertaken to study the effect of garlicjuice, allicin fraction and heat-treated allicin fraction on the hepatic glutathione s-transferase and glutathione peroxidase which protect against toxic compound and lipid peroxide in liver. The results obtained were summarized as follows. By the treatment of garlic juice, glutathione s-transferase and glutathione peroxidase activity was increased in hepatic cytosolic fraction compare with control group. The enzyme activtiy is more increased by treatment with boiled garlic juice compared with fresh garlic juice in rats. The effect of allicin fraction and heat-treated allicin fraction on the hepatic glutathione s-transferase was observed that these components inhibited the enzyme activity in vitro, whereas the enzyme activity was strongly inhibited heat-treated allicin fraction than allicin fraction. These observation led us to conclude that the garlic components which are a stable substance in heat may regulate the hepatic glutathione s-transferase and glutathione peroxidase activity.

前腕部 經穴 取穴에서 骨度分寸法과 一夫法의 比較 硏究

박히준,채윤병,차웅석,박종배,이혜정,이향숙,인창식,고형균,김수영,최일환,김강식,문정배,배기태,유경환,육근영,정병주,손인철,임사비나 WHO COLLABORATING CENTRE FOR TRADITIONAL MEDICINE 2004 東西醫學硏究所 論文集 Vol.2004 No.-

Background : The cun measurement System, an essential and convenient method in locating acupoints, has been widely used in the practice of acupuncture. However, traditional cun measurement has been criticized for its lack of reliability. Objectives : The purposes of this study are to determine if one cun measured by the directional methods have a consistency with that of proportional methods and to investigate which factors are related with these differences, especially in forearm. Methods : The distance between the elbow crease and the wrist crease of forearm was compared to a reference value of one cun obtained by the directional method. In this method, one cun is one third of the distance between index finger and Small finger of a subject, measured at proximal interphalangeal joint. In addition, to investigate the factors influencing the differences between these two methods, we measured the height and body weight and calculated body mass index (BMI). Finally we analyzed the factors correlated with these lengths by linear regression test. Results : The results showed that one cun obtained by the directional methods were significantly different from one cun by the proportional methods in forearm. It was demonstrated that the length acquired with the directional method was more correlated with body weight and body mass index, while the length obtained by the proportional method was more correlated with the height.

김해시 가로수 현황과 식재방법개선에 관한 연구

박태근,김석규,김승환 동아대학교 건설기술연구소 2000 硏究報告 Vol.24 No.1

The purpose of this study is to investigate the status of street trees planted on main roads in Kimhae city. The species of street trees in Kimhae city are nine, it is not various. As the planting ratio of Ginkgo biloba, Prunus yedoensis, Zelkova serrata, Prunus sargentii is 86%, it is finded that street trees are concentrated on some species of trees. The planting ratio of deciduous tree in Kimhae city is 95.8%. Therefore it needs to increase a planting ratio of evergreen tree.

Styrene과 2-Hydroxypropylacrylate(2-HPA) 공중합 특성

박근호,정영언,김남석,설수덕,서영옥 東亞大學校 大學院 1999 大學院論文集 Vol.24 No.-

Solution copolymerization of Styrene(St.) with 2-Hydroxypropylacrylate(2-HPA) was carried out with Benzoylperoxide(BPO) as an initiator in toluene at 80℃ in a batch reactor. Reaction volume and reaction time were 0.3 liters, 7hours respectively. The time to reach steady state was about the six time. The monomer reactivity ratios, r1(St.) and r2(2HPS) were determined by both the Kelen-Tudos method and the Fineman-Ross method : r1(St.)=0.376(0.330), r2(2-HPA)=0.408(0.778). The activation energy of thermal decomposition was in range of 33∼55 kcal/mol.

경쟁, 혁신, 그리고 경제의 진화

朴奭根 인제대학교 1998 仁濟論叢 Vol.14 No.1

This paper brings forth attemps to discuss the interrelationships and possible connecting threads between traditional evolutionary theory and econimic theory. Actually it is not unusual that some terms are used interchangeably in this field. Hayek(1945, p.523) argued that 'economic problems arise always and only in consequence of change.' This implies that evolutionary theory is one way of studying economic problems. Meanwhile, Alfred Marshall asserted more directly that 'the tendency to variation is a chief cause of progress'. That is, he pointed that the essence of evolutionary thinking lies in the variation exhibited by human artifacts. In this sense this paper aims to summarize the history of evolutionary economics from Scottish enlightment movement through Marshall to Veblenn's institutionalim and Hayek's Austrian theory of socio-cultural evolution in advance. Moreover a wide interpretation of Schumpeter's theory of economic evolution has been tried out in this paper to reassert the importance of Schumpeter's contribution to evolutionary economics. It also aspires to shed light on some fundamental problems concerning evolutionary economics: i) the relationship between Warlasian equilibrium and economic evolution; ii) the usefulness of Darwinian theory for Schumpeterian economics; and finally iii) the precise nature of the evolutionary forces at work in economic system. The main part of this paper applied the Darwinian framework to Schumpeter's theory of economic evolution in an attempt to identify and elucidate its implicit evolutionary mechanisms. Then we find out firstly the analysis of a stationary process has some limited uses as a theoretical contrasts to the process of economic evolution. And in this inpretation, Schumpeter's theory of economic evolution turns out to be strongly relevant to evolutionary economics. To summarize, it is safe to say that Schumpeter's theory of economic evolution contains a comprehensive and highly relevant analysis of the Darwinian forces of 'guided variation(innovation)', 'biased trasmision(immitation and learning)', and 'natural selection (competition and differential survival) which interact in capitalist economies to generate productivity growth.