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하이퍼미디어 시스템 탐색의 최적 스케쥴을 찾는 통계적 페트리 넷을 이용한 새로운 패러다임
임재걸,변정용 동국대학교 경주대학 1997 東國論集 Vol.16 No.1
Information providers on WWW have comprehensive meta-knowledge of their information: For each data unit, they know the size of data, time needed to read, the subject of the data, the objective value of the data, how close it is to the original information, and so on. With this comprehensive meta-knowledge, an information provider can find an optimal schedule of information exploration for the users. A schedule is a sequence of hypermedia scenarios,where as a hypermedia scenario is a sequence of hyperlinked multimedia data units. A schedule is legal if the schedule can be finished within a given time. A legal schedule is optimal if it gives the maximum satisfaction to the user. This paper proposes a new paradigm to find such an optimal schedule. We assume that the data units are graded on certain criteria. For example, a piece of data is about an architectural "national treasure" whereas another one is about a "general treasure". With this grades and the degree of closeness to the original information, we can get the degree of potential user's satisfaction. Now, we need the time required to finish a hypermedia scenario. As a method to find such a time, we propose a stochastic Petri net method. Our stochastic Petri net method first builds a Petri net model of a hypermedia scenario. A data unit is presented as a place in a Petri net. Out going arc form a place is mapped with a "spent time distribution table". Therefore, we can perform Monte Carlo simulation to estimate the time needed to go through the Petri net from the start place to the final place. The estimated time is the time required to finish the hypermedia scenario. Once we have user's satisfaction p and time required to read t for each hypermedia scenario, then an optimal schedule is the sequence of scenarios in the order of p/t.
항정신병약물을 처음으로 사용하는 초발 정신증 환자에서 나타나는 체중 및 대사성 지표의 변화 : 후향적 연구
김우진,심주철,공보금,강제욱,문정준,김정은,김민걸,박민경,김성진,김현정,정도운 대한생물치료정신의학회 2011 생물치료정신의학 Vol.17 No.2
Objectives:This study was to identify weight & metabolic changes in first-episode psychotic patients with antipsychotics use and investigate the differences of weight & metabolic changes between first-episode psychotic patients and controls with antipsychotics use. Method:In this retrospective study, twenty eight first-episode psychotic patients and twenty eight controls with schizophrenia, schizoaffective or bipolar disorder defined by DSM-IV criteria were included. Information about demographic and clinical characteristics of the subjects was gathered from the medical records. Also body weight, sBP, dBP, fasting glucose, lipid profile and WBC count were evaluated before and after antipsychotics use. Rogistic regression was conducted to assess factors associated with weight gain. Results:First-episode psychotic patients showed more weight and BMI changes than controls after antipsychotics use, and these changes continue over 12 months. On the other hand, there were no significant factors associated with weight gain. Conclusion:The results of present study suggest that antispychotics is one of the major causes inducing weight gain of psychotic patients and antipsychotics-induced weight gain is more vulnerable to drug-naive first-episode psychotic patients.
Jeong, Sanghwa,Won, Nayoun,Lee, Jinsik,Bang, Jiwon,Yoo, Jeongsoo,Kim, Sang Geol,Chang, Jeong Ah,Kim, Joonghyun,Kim, Sungjee Royal Society of Chemistry 2011 Chemical communications Vol.47 No.28
<P>A new multiplexed NIR <I>in vivo</I> imaging is showcased by using quantum dots and NaYF<SUB>4</SUB>:Yb<SUP>3+</SUP>,Tm<SUP>3+</SUP> nanoparticles. The ‘temporal’ multiplexing is demonstrated by alternating the excitation wavelengths and unmixing the emissions of different probes. Multiplexed cellular imaging and the cellular trafficking in animal models are shown.</P> <P>Graphic Abstract</P><P>A new multiplexed imaging scheme is demonstrated by alternating the excitation wavelength of quantum dots and NaYF<SUB>4</SUB>:Yb<SUP>3+</SUP>,Tm<SUP>3+</SUP> nanoparticles. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1cc12746b'> </P>
A Study on Development of Laptop-Based Pilots' Ship-Handling Simulation Software
Jeong, Tae-Gwoen,Chen, Chao,Lee, Shin-Geol,Lee, Jeong-Jin,Huh, Yong-Bum Korean Institute of Navigation and Port Research 2012 한국항해항만학회지 Vol.36 No.7
Berthing and unberthing maneuver is essential work for marine pilots and securing the safety against risks during the maneuver is more important than anything else. Moreover, the maneuvering environment in ports and harbors has changed rapidly and got worse due to development of a new port, the advent of a new type or large-sized ship, and the rapid increase in harbor traffic. As one of measures taken to cope with such changes in the maneuvering environment and for each pilot to improve his own maneuvering ability, this paper developed laptop-based ship-handling simulator which is readily available anytime and anywhere. This paper is to develop a conning display for ship's maneuvering and electronic chart based display widely used nowadays to represent a model ship's movement. The displays were arranged appropriately considering pilot age, easy handling by mouse, using a maximum screen, proper arrangement of rudder, engine, thruster, tug etc and representation of information. Up to now thirteen (13) model ships were developed based on real-ship, whose mathematical model is Japanese MMG & pilots' low speed maneuver.
A Study on Development of LCD monitor-Based Pilots' Ship-Handling Simulator
Jeong, Tae-Gweon,Chen, Chao,Lee, Shin-Geol,Lee, Jeong-Jin,Huh, Yong-Bum Korean Institute of Navigation and Port Research 2012 한국항해항만학회지 Vol.36 No.9
This paper is to introduce the development of a LCD monitor-based pilots' ship handling simulator installed in the office of Korea Maritime Pilots Association. This simulator is composed of hardware which includes working server array, operation PC, monitor array, rudder, thruster and telegraph peripheral devices, and software which includes ship mathematical model software, ship conning software, image supporting software and so on. In this simulator, MMG mathematical model is used to create thirteen(13) ship models, which are based on sea trial data & pilots' opinion. According to requirements of pilots, virtual scenes of different port areas are built, and some required additional functions are also developed. By using this simulator, pilots can fulfill all kinds of training exercises, design of channel approaching ports, traffic safety analysis, prevention of accident research and other tasks, so as to grasp the characteristics of different ships, and accumulate experience for piloting.
Jeong, Heondo,Na, Jeong-Geol,Jang, Min Su,Ko, Chang Hyun American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.5
<P>In hydrogen production by methanol steam reforming reaction with microchannel reactor, Al2O3 thin film formed by atomic layer deposition (ALD) was introduced on the surface of microchannel reactor prior to the coating of catalyst particles. Methanol conversion rate and hydrogen production rate, increased in the presence of Al2O3 thin film. Over-view and cross-sectional scanning electron microscopy study showed that the adhesion between catalyst particles and the surface of microchannel reactor enhanced due to the presence of Al2O3 thin film. The improvement of hydrogen production rate inside the channels of microreactor mainly came from the stable fixation of catalyst particles on the surface of microchannels.</P>