Wyniki wyszukiwania - Biblioteka Nauki

1

IHO S-100 data model and relevant product specification

100%

Lee S. , Kim H.

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2024

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tom Vol. 18 No. 2

297--301

EN

The International Hydrographic Organization (IHO) has established a new hydrographic information standard, the S-100 standard. This standard applies the ISO 19100 series to the legacy hydrographic exchange standard in order to overcome the limitations of existing hydrographic information expression. The first version of the S-100 standard was released in 2010, and the latest version, 5.0.0, was released in 2022. The International Maritime Organization (IMO) officially adopted the IHO's S-100 for hydrographic information exchange. The S-100 standard is the base standard, and each hydrographic information is developed as a document called the product specification. The product specification is being developed and led by various standardization organizations. The product specifications developed by each standardization organization are based on S-100, but they are defined in various ways according to the characteristics of information and expression methods. In this paper, the different product specifications of IHO's S-12x series and IALA's S-2xx series are analyzed in terms of features and classes from the data model point of view. The analysis of the feature, attribute, and feature relationship of each product specification was conducted by reviewing both the Data Classification and Encoding Guide (DCEG) and the entire document of the product specification. This study has identified areas of overlap in S-100 product specifications and has explored potential solutions to address these issues.

2

Behavior analysis of genetic fuzzy controller for an autonomous robot

100%

Cho S. , Lee S.

Control and Cybernetics

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1998

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tom Vol. 27, no 4

579-591

EN

To program an autonomous robot so that it acts reliably in a dynamic environment is a very hard task. Towards a promising approach to this problem, we have developed a genetic fuzzy controller for a mobile robot, and showed the possibility by applying it to a simulated robot called Khepera. The robot gets input from eight infrared sensors and operates two motors according to the fuzzy inference based on the sensory input. This paper attempts to analyze the adaptive behaviors of the controller by using automata, which indicates the emergence of several strategies to make the robot to navigate the complex space without bumping agains the walls and obstacles.

3

Spatial segregation of foraging sites in winter mixed-species flocks of forest birds near Seoul, Korea

100%

Lee S. , Jablonski P. G.

Polish Journal of Ecology

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2006

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tom 54

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nr 3

EN

The wintering mixed flocks of tits (Paridae) and associated birds, are good objects for studying ecological niche division. In this respect the mixed species flocks on the Asian continent are poorly studied in comparison to European and North American ones. In this report we describe spatial distribution of foraging sites of eight bird species in 39 winter flocks near Seoul, Korea: Varied tit – Parus varius Temminck & Schlegel, Great tit – P. major Temminck & Schlegel, Marsh tit – P. palustris Bianchi, Coal tit – P. ater Buturlin, Long-tailed tit – Aegithalos caudatus Clark, Nuthatch – Sitta europaea Swinhoe, Japanese Pygmy Woodpecker – Dendrocopos kizuki Taka-Tsukasa, and Goldcrest – Regulus regulus Blakiston. Foraging sites (in coniferous and mixed forests) were classified into five height layers: on the ground, <1.5 m above the ground, 1.5–4 m, 4–7m, and > 7m. Trees were divided into three horizontal zones depending on the distance from trunk: crown interior, intermediate zone, and external twigs. Species differed significantly in the use of height layers: P. major foraged mostly on the ground, P. ater and A. caudatus foraged mostly in the highest forest layer, P. palustris was often seen in bushes, and P. varius occurred in the middle tree layer. There was no clear correlation between height of foraging and species body size. However, body size played an important role for segregation in horizontal zones, and two species, the larger P.major and the smaller P. ater differed significantly in the mean distance from trunk. Species of large body size like P. varius and P. major, foraged mostly in the interior of the tree crown, while the smaller species, P.ater and A. caudatus, foraged mostly in the external zone; the intermediate in size, P. palustris, foraged equally often in each of the three zones. The sites used most often by Korean populations of three tit species, P. major, P. palustris and P. ater, were similar to the sites used by European populations of the respective species. These results represent one of a few quantitative studies on mixed species flocks in continental Asia.

4

Upgrading of vibrating compactor of the railway track ballast of VPO-3000 machine

80%

Lee S. , Akhmetov M. , Ibraimov A. , Taran M.

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2012

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tom T. 7, z. 4

95-104

EN

In the course of work a new vibrating compactor with single-direction inertial forces according to the authors’ innovative license is applied. Examination of possible dependence on substantiation of the new vibrating device parameters is shown. The new single-direction vibrating device for road crushed rock compaction allows decreasing vibration to the machine frame and increasing its working capacity. The new vibrating device’s efficiency to 11,7% increases the existing ones.

5

Dynamic travel demand estimation using real-time traffic data

80%

Lee S. , Kim J. , Lim Y. , Nam D.

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tom Vol. 20, iss. 1-2

69-86

EN

It is often desirable to collect dynamic Origin-Destination (OD) demand in order to build effective freeway traffic management strategies. Hence, developing a practical model capable of estimating the dynamic OD demand continuously using real data from Freeway Traffic Management System (FTMS) is an attractive approach to analyze the change of traffic pattern due to the regional development. Currently, many dynamic OD estimation models have been developed but have several technical issues when applied to real systems because difficulty to capture the dynamic process and collect the relative parameters. In this paper, we propose a simple traffic flow technique that uses real traffic data collected from the vehicle detector system (VDS) to remove the difficulty of application. To increase the observability, we use the mainline and off-ramp flows derived from the proposed traffic flow technique in the error minimization objective function. The proposed dynamic OD estimation framework is evaluated using real data collected from the Seohaean Freeway in Korea and ean be applied to real system easily. Keywords: Dynamic OD Estimation Model, FTMS, Dynamic Traffic Flow Model, Genetic Algorithm.

PL

W celu opracowania efektywnych strategii zarządzania ruchem na autostradach pożądane jest zbieranie dynamicznie zmieniającego się popytu zapisanego w postaci macierzy ruchu na dojazdach do autostrady, na zjazdach z niej oraz pomiędzy dojazdami i zjazdami. Jednakże nie jest uzasadnione ekonomicznie instalowanie czytników Automatycznej Identyfikacji Pojazdów (AVI) wzdłuż całej autostrady w celu uzyskania dynamicznych danych o popycie. Dlatego interesującym podejściem jest opracowanie modelu dynamicznej estymacji macierzy ruchu, wykorzystującego dostępne dane pozyskiwane w czasie rzeczywistym poprzez system detekcji pojazdów (VDS). Ogólnie w istniejących modelach dynamicznej estymacji macierzy ruchu występują pewne problemy techniczne. Po pierwsze, problemem jest programowanie dwupoziomowe, które składa się z modułu potoków ruchu oraz modułu dynamicznej estymacji macierzy ruchu. Ze względu na niewypukły charakter programowania dwupoziomowego trudno jest uzyskiwać rozwiązania, które gwarantowałyby optimum globalne. Po drugie, występuje problem nieokreśloności. Istnieje wiele metod pozwalających na minimalizację błędu pomiędzy danymi szacunkowymi i rzeczywistymi. W celu wyeliminowania błędów występujących w modelach sformułowanych jako zadania programowania dwufazowego autorzy proponują w artykule nowy model określania potoków ruchu, wykorzystujący dane uzyskiwane w czasie rzeczywistym z systemów VDS, takie jak: natężenia ruchu, prędkość podróży, wskaźnik wykorzystania drogi. W celu poprawy dokładności dynamicznej estymacji macierzy ruchu autorzy wykorzystują natężenia ruchu na zjazdach z autostrady uzyskane za pomocą nowego modelu potoków ruchu jako dodatkowy parametr w funkcji celu minimalizującej błąd estymacji. Zaproponowane podejście do dynamicznej estymacji popytu w macierzy ruchu zweryfikowano, wykorzystując dane uzyskiwane w czasie rzeczywistym na autostradzie Seohaean w Korei.

6

A fast and robust level set motion-assisted deformable registration method for volumetric CT guided lung intervention

80%

Kim D. , Kim N. , Lee S. , Seo J. B.

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tom Vol. 38, no. 3

439--447

EN

This paper describes the accurate deformable registration method for image-guided lung interventions, including lung nodule biopsy and radiofrequency ablation of lung tumours. A level set motion assisted deformable registration method for computed tomography (CT) images was proposed and its accuracy and speed were compared with those of other conventional methods. Fifteen 3D CT images obtained from lung biopsy patients were scanned. Each scan consisted of diagnostic and preoperative CT images. Each deformable registration method was initially evaluated with a landmark-based affine registration algorithm. Various deformable registration methods such as level set motion, demons, diffeomorphic demons, and b-spline were compared. Visual assessment by two expert thoracic radiologists using five scales showed an average visual score of 3.2 for level set motion deformable registration, whereas scores were below 3 for other deformable registration methods. In the qualitative assessment, the level set motion algorithm showed better results than those obtained with other deformable registration methods. A level set motion based deformable registration algorithm was effective for registering diagnostic and preoperative volumetric CT images for image-guided lung intervention.

7

Parental provisioning in response to natural variation of brood size in the Black-billed magpie (Pica pica L.) : video analysis of behaviors in the nests

80%

Lee S. , Jabłoński P. , Choe J. , Choi J.

Polish Journal of Ecology

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2010

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tom Vol. 58, nr 3

553-562

EN

Natural selection will favor parents who adjust their effort in relation to the fitness costs and benefits from the current brood. In this study, we investigated how magpie parents adjust provisioning effort based on the number of nestlings in the brood, by analyzing video recordings of begging and feeding behaviors of birds. The number of visits per hour increased with brood size, but the number of feeding events per visit did not. Because of the latter, parental provisioning that a nestling is receiving on average decreased in larger broods. This may be viewed either as an evidence for the limitation of parental provisioning in larger broods, or as an evidence of parental strategy optimizing the brood-size-specific provisioning effort for the current reproductive event as a tradeoff between current and future reproduction. With other aspects of parental provisioning behavior, we did not find clear indication that parent confronts upper limitation in provisioning large broods. Pervisit number of feeding and nestlings. body condition around the time of fledging did not depend on brood size, which implies that parental effort is not at its limit in larger broods. Based on the results, we suggest that the provisioning effort of black-billed magpie parents is better explained by the life-history trade-off model for provisioning.

8

Design of simultaneous input-shaping-based SIRMs fuzzy control for double-pendulum-type overhead cranes

80%

Qian D. , Tong S. , Yang B. , Lee S.

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tom Vol. 63, nr 4

887--896

EN

Overhead cranes are extensively employed but their performance suffers from the natural sway of payloads. Sometime, the sway exhibits double-pendulum motions. To suppress the motions, this paper investigates the design of simultaneous input-shaping-based fuzzy control for double-pendulum-type overhead cranes. The fuzzy control method is based on the single input-rule modules (SIRMs). Provided the all the system variables are measurable, the SIRMs fuzzy controller is designed at first. To improve the performance of the fuzzy controller, the simultaneous input shaper is adopted to shape the control command generated by the fuzzy controller. Compared with other two control methods, i.e., the SIRMs fuzzy control and the convolved input-shaping-based SIRMs fuzzy control, simulation results illustrate the feasibility, validity and robustness of the presented control method for the anti-swing control problem of double-pendulum-type overhead cranes.

9

Facial expression recognition based on dimension model using automated feature extraction

80%

Shin Y. , Lee S. , Lee Y.

Machine Graphics and Vision

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2000

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tom Vol. 9, No. 3

573-585

EN

This paper presents a facial expression recognition based on dimension model of internal states that uses automated feature extraction. We apply this approach mostly for the frontal pose. Features of facial expressions are extracted automatically in three steps. In the first steo, Gabor wavelet representation can provide edges extraction of major face components using the average value of the image's 2D Gabor wavelet coefficient fistogram. In the second step, sparse features of facial expressions are extracted using fuzzy C-means clustering (FCM) algorithm for neural faces, and in the third step, using the dynamic model (DM) for expression images. The result of facial expression recognition is compared with dimensional values of internal states derived from semantic ratings of words related to emotion by experimental subjects. The dimensional model can recognize not only 6 facial expressions related to Ekman's basic emotions, but also expressions of various internal states. A facial expression in the dimension model includes two dimensions which are pleasure-upleasure and arousal-sleep. We show the result of expression recognition in the dimension model. In this paper, with the dimension model we have improved the limitations of expression recognition based on basic emotions, and have extracted features automatically with a new approach using the FCM algorith and the Dynamic Model.

10

Hearing impairment among Korean farmers, based on a 3-year audiometry examination

80%

Lee S. , Lee K. , Lee S.-J.

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nr 1

11

Próby starzenia materiałów izolacyjnych dla silników zasilanych z falownika

80%

Bartoszek A. , Menzel R. , Lee S.

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tom Nr 85

129-134

EN

Inverter Driven Motors (IDM) with high speed switching and advanced Pulse Width Modulation (PWM) techniques have been widely used for variable speed applications. Adjustable Speed Drives (ASD) with high speed switching devices provide very accurate control of speed and torque to a system. However, ASD give electrical stress such as high peak voltage, fast rate of voltage change (dV/dt) and extremely high carrier frequency to the insulation materials of a motor. The degradation of electrical insulation used in Inverter Driven Motors can lead to premature failure of motors sometimes days or months after startup. This paper presents the evaluation process of insulating materials used for IDM. Thermal aging tests were carried out on motorettes with enameled wires, impregnating resin and different insulating materials. Partial Discharge Inception Voltage (PDIV) measurement and Diagnosis test, based on IEC 60034-18-41 TS, were conducted on the motorettes. It could be demonstrated that the PDIV of the motorette decreased during aging and was very much dependent on the types of insulating materials being used.

12

Behavioural changes in rats exposed to perinatal morphine

71%

Timar J. , Gyarmati S. , Lee S. , Kiss E. , Furts S.

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tom 65

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nr 5

13

Urban and natural components of Korean magpie (Pica pica sericea) territories and their effects on prey density

71%

Kim S. , Srygley R. , Lee J. , Lee S. , Choe J.

Polish Journal of Ecology

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2012

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tom Vol. 60, nr 2

407-417

EN

Urban landscapes have a negative impact on bird species diversity, yet particular species thrive in urban communities. Like many other corvids, the Korean magpie is a successful colonizer of urban environments. On the semiurban campus of Seoul National University in Korea, we investigated whether magpies adjust territory size with building area and secondarily, whether they use vegetation and artificial components of their territory as indicators of prey density. We measured territorial areas and divided these into vegetation and artificial areas, distinguishing building area as a separate feature. We sampled prey density on each territory during the nestling stage. Territory size increased with the square root of building area (SRBA). As the length of building perimeter also increases with SRBA, we conclude that territory size was proportional to building perimeter. Prey density decreased with SRBA indicating that buildings had a negative impact on prey. Breeding success was also negatively related to SRBA. We suggest that magpies adjusted territory size according to the length of building perimeter due to a decline in prey density. As prey density declined, artificial pavement area was added to include open trash bins, which increase the availability of anthropogenic refuse such as discarded food. Vegetation area declined as prey density increased, but changes in vegetation area were minor and had little impact on prey availability measured at ground level. Structural cues were not used to adjust vegetation area, and artificial structural cues were not used to adjust territorial size over direct monitoring of prey density.

14

Glutamate receptors mediating cockroach juvenile hormone biosynthesis

71%

Pszczolkowski M. A. , Liu H.-P. , Lin S.-J. , Lee S. , Chiang A.-S.

Acta Neurobiologiae Experimentalis

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2001

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tom 61

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nr 3

15

Implementation of a Novel Audio Network Protocol

71%

Lee J. , Jeon H. , Choi P. , Kwon S. , Lee S.

Archives of Acoustics

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2018

|

tom Vol. 43, No. 4

637--645

EN

Recently, the rapid advancement of the IT industry has resulted in significant changes in audio-system configurations; particularly, the audio over internet protocol (AoIP) network-based audio-transmission technology has received favourable evaluations in this field. Applying the AoIP in a certain section of the multiple-cable zone is advantageous because the installation cost is lower than that for the existing systems, and the original sound is transmitted without any distortion. The existing AoIP-based technology, however, cannot control the audio-signal characteristics of every device and can only transmit multiple audio signals through a network. In this paper, the proposed Audio Network & Control Hierarchy Over peer-to-peer (Anchor) system enables all audio equipment to send and receive signals via a data network, and the receiving device can mix the signals of different IPs. Accordingly, it was possible to improve the system-application flexibility by simplifying the audio-system configuration. The research results confirmed that the received audio signals from different IPs were received, mixed, and output without errors. It is expected that Anchor will become a standard for audio-network protocols.

16

Segmentation and surface reconstruction of a cadaver heart on Mimics software

71%

Shin D. S. , Lee S. , Park H. S. , Lee S.-B. , Chung M. S.

Folia Morphologica

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2015

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tom 74

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nr 3

EN

The Visible Korean research team used Mimics software (Materialise, Leuven, Belgium) for the segmentation and subsequent surface reconstruction of heart structures using information obtained from sectioned images of a cadaver. Twenty-six heart components were outlined in advance on Photoshop (Adobe Systems, San Jose, CA, USA). By use of the Mimics, the outlined images were then browsed along with the vertical planes as well as the 3-dimensional surface models, which were immediately built by piling the images. Erroneous delineation was readily detected and revised until satisfactory heart models were acquired. The surface models and the selected sectioned images in horizontal, coronal, and sagittal planes were inputted into a PDF file, where any combinations of reconstructed constituents could be displayed and rotated by the user. Mimics software accelerated the segmentation and surface reconstruction of heart anatomical structures. Similar benefits hopefully result from various serial images of other organs. The PDF file, and plane and stereoscopic image data are being distributed to others, and should prove valuable for medical students and clinicians. (Folia Morphol 2015; 74, 3: 372–377)

17

Fabrication of Mo-Si-B Intermetallic Compound Powders Under Different Heat Treatment Conditions

61%

Park J. H. , Lee S. , Kim D. , Kim Y. , Yang S. H. , Lee S. H.

Archives of Metallurgy and Materials

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2018

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tom Vol. 63, iss. 3

1509--1512

EN

In this research, we investigated the effects of reduction atmospheres on the creation of the Mo-Si-B intermetallic compounds (IMC) during the heat treatments. For outstanding anti-oxidation and elevated mechanical strength at the ultrahigh temperature, we fabricated the uniformly dispersed IMC powders such as Mo5SiB2 (T2) and Mo3Si (A15) phases using the two steps of chemical reactions. Especially, in the second procedure, we studied the influence of the atmospheres (e.g. vacuum, argon, and hydrogen) on the synthesis of IMCs during the reduction. Furthermore, the newly produced IMCs were observed by SEM, XRD, and EDS to identify the phase of the compounds. We also calculated an amount of IMCs in the reduced powders depending on the atmosphere using the Reitveld refinement method. Consequently, it is found that hydrogen atmosphere was suitable for fabrication of IMC without other IMC phases.

18

Experiments and simulations on the possibility of radiative contraction/collapse in the PF-1000 plasma focus

61%

Akel M. , Cikhardt J. , Kubes P. , Kunze H.-J. , Lee S. , Paduch M. , Saw S. H.

Nukleonika

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2016

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tom Vol. 61, No. 2

145--148

EN

Experimental studies of discharges in the plasma focus facility with neon filling and respective numerical simulations employing the radiative Lee code are reported. The pinch currents exceed the Pease-Braginskii current, which indicates that radiative losses are larger than heating and that contraction of the formed plasma should occur. Both of these effects were indeed observed. Parallel numerical simulations were crucial for the identifi cation of such an effect.

19

0.2-kJ and 2-kJ high rep rate Dense Plasma foci : their design, technology, and applications

61%

Dubrovsky A. V. , Gribkov V. A. , Ivanov Y. P. , Lee P. , Lee S. , Liu M. , Samarin V. A.

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2001

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tom Vol. 46, suppl. 1

107--111

EN

The paper presents various designs of several medium and small size Dense Plasma Focus (DPF) chambers intended for numerous applications, a description of technologies used in these facilities, and some results reached with these devices by using a number of diagnostic techniques. In present experiments the DP foci have been used mainly as an X-ray source. We discuss here how it is possible to satisfy absolutely new and very strict demands on the construction and technology for the devices to be eventually applied in science and industry. Between these characteristics there are a high repetition rate (typically 1…15 Hz) and a long lifetime (over 1 million shots). Their switching elements, a collector and chambers must withstand a high quasi-continuous heat load (up to 100 kW). High energy density in the central part of the chamber anode and the necessity to provide a channel for radiation extraction demanded a special construction and specific materials implementation in this region. Their X-ray spectrum should be tuned. They have to operate with different working gases and preferably in a wide range of pressures. All these points are discussed in this report. Capabilities of the described techniques are illustrated by results of the recent experimental studies carried out with facilities located at the Nanyang Technological University (NX1) as well as at the Lebedev Physical Institute (PF-0.2).

20

Behavioural changes in rats exposed to perinatal MDMA

61%

Gyarmati S. , Timar J. , Lee S. , Kiss E. , Szabo A. , Furts S.

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tom 65

|

nr 5