SOA내에서의 XPM,FWM을 이용한 WDM 시스템 파장변환기 구현

정광원,이정렬,이승우,엄진섭 강원대학교 정보통신연구소 2001 정보통신논문지 Vol.5 No.-

In this paper, a new type of wavelength converter using XPM within a loop-mirror is proposed and demonstrated. The proposed structure decreases hardware components for implementation of XPM wavelength converter and makes it possible to get non-inverted and inverted output signals simultaneously. Also, we generate wideband pumping mode series for FWM wavelength conversion scheme and propose the effective filtering method for selecting converted wavelength from FWM outputs. The results show that the pumping mode range is over 30nm within 5dB power fluctuation, and that a pumping and a prove wave can be removed successfully by using both of Michelson interferometer and polarization controller.

전자상거래에서의 지각된 위험의 분류 및 측정도구 개발에 관한 연구

정승렬,강영신,이춘열 한국정보시스템학회 2006 情報시스템硏究 Vol.15 No.1

TFELD 절연층을 위해 ITO glass위에 증착된 (Ba_(0.5),Sr_(0.5))TiO₃박막의 특성

김정환,배승춘,권성렬,정훈,박진우,김기완 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

We have studied that dielectric and electrical properties of (Ba_(0.5),Sr_(0.5))TiO_(3) thin films deposited on Indium Tin Oxide-coated glass substrate by using rf-magnetron sputtering method in this paper. Substrates were heated at room, 300℃ , 400℃, and 500℃. Working pressure was changed 5mTorr, 10mTorr, 20mTorr, 30mTorr respectively substrates temperature, and Ar:O_(2), ratio was fixed 9:1. SEM analysis was conducted to investigate thickness of BST thin films. Dielectric constant, current-voltage(I-V), and transmittance were measured. We observed difference of that thickness, dielectric constant, current-voltage(I-V), and transmittance due to variable substrates temperature and working pressure. We also obtained best conditions at 400℃, 30mTorr. Dielectric constant was 209.1 at 1kHz, leakage current density was below 7.35X10^(-7)A/cm^(2) at 100V, and transmittance was over 91%.

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.

변화관리특성이 ERP 도입성과에 미치는 영향

김은홍,김재진,정승렬,전성현 한국경영과학회 1999 한국경영과학회지 Vol.24 No.4

Recently, implementing ERP(Enterprise Resource Planning) systems has been one of major concerns of many companies. Despite the trend in the business area, few theoretical researches about the ERP have been published to date. The primary purpose of current study, therefore, lies in examining the effects of change management characteristics on ERP performance. Top management support, user participation, and consulting support were selected as change management characteristics. Additionally, ERP implementation characteristics were considered as contingency variables which may moderate the relationships between change management characteristics and ERP performance. Two ERP implementation characteristic variables introduced in this study were ERP implementation approach and ERP implementation strategy. Hypotheses concerning the relationships among those variables of change management characteristics, ERP performance and ERP implementation characteristics were empirically tested. The findings show that change management characteristics are strongly correlated with ERP performance, and ERP implementation characteristics have contingency effects, partially at least, on the relationship between change management characteristics and ERP performance.

Distribution Characteristics of Dioxins in Soils under Different Land Use in Busan, Korea

Jeong, Tae-Uk,Seo, Dong-Cheol,Jeong, Seung-Ryul,Cho, Jeong-Gu,Yoo, Pyung-Jong,Kim, Gi-Gon,Cho, Ju-Sik,Heo, Jong-Soo Korean Society of Soil Science and Fertilizer 2011 한국토양비료학회지 Vol.44 No.4

In this study, distribution characteristics of dioxins in soils in Busan, Korea were investigated regarding different land use types. Soil sampling sites that distributed through the Busan city showed dioxin concentration ranging from 0.489 to $322.736pg-TEQ\;g^{-1}$ dry weight with a mean value of $26.257pg-TEQ\;g^{-1}$ dry weight. The mean dioxin concentrations of investigated soils ranged from 1.554 to $50.357pg-TEQ\;g^{-1}$ dry weight in consideration of each land use type. That in metal refinery sites with $50.357pg-TEQ\;g^{-1}$ dry weight was higher than any other sites, followed by waste incinerator sites with $44.285pg-TEQ\;g^{-1}$ dry weight. The majority of soil samples had the same dioxin congener profiling despite the different range of dioxin concentration. Octa-CDD was the major contributor among seventeen dioxin congeners with the range from 29.5 to 70.1% in real values. In contrast to real values, dioxin congener profiles in TEQ values were dominated by 2,3,4,7,8-PeCDF which contributed about 35.3~43.8% to the total dioxin concentrations. It was judged by these results that penta-CDF was the major contributor of soil samples in Busan city. The mean ratio of PCDFs/PCDDs in real values was about 0.71, but that in TEQ values was, in contrast to it, approximately 3.03.

Distribution Characteristics of Dioxins in Marine Sediment from Busan Port in Korea

Jeong, Tae-Uk,Seo, Dong-Cheol,Jeong, Seung-Ryul,Song, Bok-Joo,Cho, Jeong-Gu,Yoo, Pyung-Jong,Kim, Gi-Gon,Cho, Ju-Sik,Heo, Jong-Soo Korean Society of Soil Science and Fertilizer 2012 한국토양비료학회지 Vol.45 No.1

Eight marine sediments from Busan port in Korea were annually analyzed to examine the concentration distribution of dioxins from 2006 to 2010. Yearly mean concentration of dioxins ranged from 186.3 to $383.3pg\;g^{-1}$ in real values and 5.087 to 8.541 pg-TEQ (Toxicity equivalency) based on dry weight of samples. The dioxin concentration at the site near fishing market was the highest concentration among all sampling sites. Also the dioxin concentration at the sites with various pollutant sources such as large ships, sewage influx and thermal power station as well as fishing market was higher than that of the sites without specific pollutant sources. Another main factor that affects the dioxin concentration is topography characteristics of the bay. The bay has relatively high dioxin concentration because of the lack of the pollutant diffusion. This study demonstrated that the dioxin concentration in the site with pollutant sources and the lack of the pollutant diffusion was relatively high as compared with the other sites. As a result of contribution ratio of dioxin congeners, OCDD (Octachlorodibenzodioxin) in all sites was major contributor in real value, in contrast, dioxin congeners in TEQ values were dominated by 2,3,4,7,8-PeCDF.

Effectiveness of Information Systems(IS) Auditing

Jeong, Seung Ryul 국민대학교 정보기술연구소 2000 정보기술연구 Vol.6 No.-

IS auditing has been known to be helpful in developing optimal IS and managing information resources successfully. However, there is a dearth of research that evaluate the effects of IS auditing. The present study attempts to assess the impacts of IS auditing based on a process perspective. In order to evaluate the effects objectively and properly, the current study collected empirical data from 58 firms. This study confirmed that IS auditing was a very effective tool for successful IS implementation. IS audit was found to increase systems quality and the maturity of the software processes. Also, IS auditing helps organizations mature in terms of the Capability Maturity Models criteria. This shows that IS auditing has a tremendous impact on facilitating organizations quality improvement efforts.

A Study on the Relationship Between BPR Problems and Contextual Variables

Jeong, Seung Ryul 국민대학교 정보기술연구소 1999 정보기술연구 Vol.5 No.-

The purpose of this study is to observes the contextual variables that affect BPR problems in different organizations. Thus, we focus on the reengineering innovative characteristics (compatibility, relative advantage, complexity, trialability, and observability) and organizational characteristics (structural overlay, organizational size, and degree of integration) based on the theoretical and empirical work in the fields of innovation, organization design, and information systems. A total of 853 questionnaires were mailed and 239 usable responses were returned. The study found that several BPR innovative characteristics (relative advantage, complexity, trialability, and observability) had significant associations with the severity of problems. Among organizational characteristics, the degree of integration (strong) and structural overlay (weak) had significant relationships with the problems. Interestingly, organizational size did not result in any significant associations. Based on the findings, we can see that the link between innovation and reengineering is a fruitful one in studying BPR implementation. In addition, the attributes of new process did play an important role in reengineering effort. Finally, it is suggested that the results of this study are parallel with the idea of the socio-technical systems approach, which attempts consciously and systematically to integrate the technical system with the social system of the organization.

Semantic Computing for Big Data: Approaches, Tools, and Emerging Directions (2011-2014)

( Seung Ryul Jeong ),( Imran Ghani ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.6

The term “big data” has recently gained widespread attention in the field of information technology (IT). One of the key challenges in making use of big data lies in finding ways to uncover relevant and valuable information. The high volume, velocity, and variety of big data hinder the use of solutions that are available for smaller datasets, which involve the manual interpretation of data. Semantic computing technologies have been proposed as a means of dealing with these issues, and with the advent of linked data in recent years, have become central to mainstream semantic computing. This paper attempts to uncover the state-of-the-art semantics-based approaches and tools that can be leveraged to enrich and enhance today`s big data. It presents research on the latest literature, including 61 studies from 2011 to 2014. In addition, it highlights the key challenges that semantic approaches need to address in the near future. For instance, this paper presents cutting-edge approaches to ontology engineering, ontology evolution, searching and filtering relevant information, extracting and reasoning, distributed (web-scale) reasoning, and representing big data. It also makes recommendations that may encourage researchers to more deeply explore the applications of semantic technology, which could improve the processing of big data. The findings of this study contribute to the existing body of basic knowledge on semantics and computational issues related to big data, and may trigger further research on the field. Our analysis shows that there is a need to put more effort into proposing new approaches, and that tools must be created that support researchers and practitioners in realizing the true power of semantic computing and solving the crucial issues of big data.