• Communications of the Korean Mathematical Society
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• v.37 no.3
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• pp.735-748
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• 2022

The global well-posedness for the fourth-order modified Zakharov equations in 1-D, which is a system of PDE in two variables describing interactions between quantum Langmuir and quantum ionacoustic waves is studied. In this paper, it is proven that the system is globally well-posed in (u, n) ∈ L² × L² by making use of Bourgain restriction norm method and L² conservation law in u, and controlling the growth of n via appropriate estimates in the local theory. In particular, this improves on the well-posedness results for this system in [9] to lower regularity.

• Journal of Korean Port Research
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• v.11 no.1
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• pp.75-83
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• 1997

In this paper, we codify the objective function that should be optimized by using Genetic Algorithm instead of Heuristic method to solve these problems. So, each bit that constitutes one structure can signify each commodity. Therefore, we can exchange customers without restriction if the traveling distance diminishes among the districts. Furthermore, even though the capacity of a customer's commodities exceeds that of a vehicle, the following vehicle can be allocated. Also, we obtained good result by testing with real data. To be brief, we can effectively allocate innumerable commodities, that have various magnitudes and weight, into restricted capacity of the vehicle by applying genetic algorithm that is useful in solving the problems of optimization.

• Educational Technology International
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• v.14 no.2
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• pp.215-228
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• 2013

In engineering education practical experiments is very important for each student, but due to the limitation of time and available resources such as laboratory equipment, space and instructors enough hands-on real experiments could not be provided to all students enrolled in the program throughout the academic year. In this sense web-based remote experiments through internet become a solution for engineering education and an emerging new paradigm for students and teachers. This paper presents the development of the web-based remote vibration experiment system for mechatronics education. Students can access this experimental equipment through an internet and conduct vibration experiment remotely without any restriction on time and place. IP address for data communication and web-service are assigned in local computer and then students receive experimental results and the captured pictures using network. The developed system provides real-time feedback of the tested results. Ubiquitous access to the system gained popularity from students.

• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.10
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• pp.1123-1130
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• 2015

Network on a chip(NoC) is a communication subsystem between intellectual property(IP) cores in a SoC and improves high performance in the scalability and the power efficiency compared with conventional buses and crossbar switches. NoC needs a synchronizer to overcome the metastability problem between data links. This paper presents a new mesochronous synchronizer(MS) which is composed of selection window generator, selection signal generator, and data buffer. A delay line circuit is used to build selection window in selection window generator based on the delayed clock cycle of transmitted clock and the transmitted clock is compared with local clock to generate a selection signal in the SW(selection window). This MS gets rid of the restriction of metastability by choosing a rising edge or a falling edge of local clock according to the value of selection signal. The simulation results show that the proposed MS operates correctly for all phase differences between a transmitted clock and a local clock.

• Journal of the Korea Society of Computer and Information
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• v.15 no.10
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• pp.27-34
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• 2010

This paper proposes an efficient method for verifying palmprint which is captured at the natural interface without any physical restriction. The location and orientation of the region of interest (ROI) in palm images are variously appeared due to the translation and rotation of hand. Therefore, it is necessary to extract the ROI stably for palmprint recognition. This paper presents a method that can extract the ROI, which is based on the reference points that are located at the center of the crotch segments between index finger and middle finger and between ring finger and little finger. It also proposes a palmprint recognition method using the histogram of local binary patterns (LBP). Experiments for evaluating the performance of the proposed method were performed on 1,597 palmprint images acquired from 100 different persons. The experimental results showed that ROI was correctly extracted at the rate of 99.5% and the equal error rate (EER) and the decidability index d' indicating the performance of palmprint verification were 0.136 and 3.539, respectively. These results demonstrate that the proposed method is robust to the variations of the translation and rotation of hand.

• Asian Pacific Journal of Cancer Prevention
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• v.16 no.8
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• pp.3419-3423
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• 2015

Background: Liposarcoma of the spermatic cord is rare and frequently misdiagnosed. The standard therapeutic approach has been radical inguinal orchiectomy with wide local resection of surrounding soft tissues. The current trend of organ preservation in the treatment of several cancers has started to evolve. Herein we present our testis-sparing surgery experience in the treatment of spermatic cord liposarcoma and a pooled analysis on this topic. Materials and Methods: Clinical information from patient receiving organ-sparing surgery was described. Clinical studies evaluating this issue were identified by using a predefined search strategy, e.g., Pubmed database with no restriction on date of published papers. The literature search used the following terms: epidemiology, surgery, chemotherapy, radiotherapy, testis sparing surgery, spermatic cord sarcomas/liposarcomas. Results: Patient received a complete excision of the lesion, preserving the spermatic cord and the testis. The final pathological report showed a well differentiated liposarcoma with negative surgical margins and no signs of local invasion. After 2-year of follow-up, there was no evidence of local recurrence. Since the first case reported in 1952, a total of about 200 well-documented spermatic cord liposarcoma cases have been published in English literature. Among these patients, only three instances were reported to have received an organ-sparing surgery in the treatment of spermatic cord liposarcoma. Conclusions: Radical inguinal orchiectomy and resection of the tumor with a negative microscopic margin is the recommended treatment for liposarcoma of the spermatic cord. But for small, especially well-differentiated, lesions, testis-sparing surgery might be a good option if an adequate negative surgical margin is assured.

• Journal of Korean Library and Information Science Society
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• v.41 no.4
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• pp.191-209
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• 2010

This study suggests problems with analyzing the contents of ordinances which support establishment and management of small libraries. This study analyzed the provisions which comprise the ordinances, targeting 25 ordinances that a local government enacted. The analysis targets the name of the ordinances, functions of the small libraries, guidelines of establishment, the duties of the local government, manpower in management, management rules of libraries, a steering committee etc. As a result, the provisions of the ordinances were not very different, and it was difficult to find ordinances which reflect regional characteristics. Also, in the provisions, it was pointed out as a restriction that the scale of establishment and management can be altered because there are free provisions more than compulsory ones. Thus, the ordinances of small libraries have to be regarded in local libraries' infrastructure, and supporting guidelines with efforts to assure publicity.

• The Korean Journal of Pain
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• v.13 no.1
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• pp.67-73
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• 2000

Background: This study intends to evaluate the benefits of the administation of continuous infusion and demand doses of 0.125% ropivacaine compared with 0.125% bupivacaine after addition of fentanyl using patient controlled epidural analgesia (PCEA) for pain control during labor. Methods: Thirty-nine American Society of Anesthesiologists physical status 1 or 2 parturients were randomized by double blind design to receive either 0.125% bupivacaine with fentanyl 1 ug/ml or equivalent concentration of ropivacaine/fentanyl using PCEA; with 6~8 ml/hr basal rate, 3 ml bolus, 5 min lockout, 30 ml/hr dose limit. We assessed analgesia, the amount of study solution used in PCEA, sensory levels, motor block (0~3 scales), side effects and patient satisfaction. A postpartum questionnaire was carried out afterward. Results: There were no differences in visual analogue scores (VAS) for pain, hourly study solution use, sensory levels, side effects and patient satisfaction between groups. However, patients administered ropivacaine/fentanyl had significantly less demand, less administered in PCEA, less numbness and restriction of movement compared with patients in the bupivacaine/fentanyl group. Conclusions: Ropivacaine 0.125% with fentanyl, when administerd epidurally by PCEA for labor analgesia, was equally efficious as bupivaciane 0.125% with fentanyl, having with minimal numbness and restriction of motion.

• Journal of KIISE:Computer Systems and Theory
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• v.31 no.10
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• pp.593-602
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• 2004

A new surface reconstruction scheme for approximating the surface from a set of unorganized 3D points is proposed. Our method, called shrink-wrapped boundary face (SWBF) algorithm, produces the final surface by iteratively shrinking the initial mesh generated from the definition of the boundary faces. Proposed method surmounts the genus-0 spherical topology restriction of previous shrink-wrapping based mesh generation technique, and can be applicable to any kind of surface topology. Furthermore, SWBF is much faster than the previous one since it requires only local nearest-point-search in the shrinking process. According to experiments, it is proved to be very robust and efficient for mesh generation from unorganized points cloud.

• Research in Plant Disease
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• v.22 no.1
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• pp.55-58
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• 2016

A Cucumber mosaic virus (named CMV-Tr1) isolated from the white clover (Trifolium repens) showing mosaic and malformation that found in a pepper field. Cucumber mosaic virus was identified through confirmation with PT-PCR, PCR-restriction fragment length polymorphism, and sequence analysis of coat protein (CP) gene. CMV-Tr1 mosaic symptom on the upper leaves of five tobacco species including Nicotiana benthamiana, Cucumis sativus, Physalis angulata, and Solanum lycopersicon. In Chenopodium quinoa and Vigna unguiculata the isolate showed local lesions in inoculated leaves. CMV-Tr1 compared with CMV-As in the sequence identity of CP gene. CMV-Tr1 showed 98.9% and 99.5% homologies at nucleotide and amino acid levels, respectively. Phylogenetic analysis of the CP gene indicated that CMV-Tr1 belongs to the CMV subgroup IB base on the CP. To our knowledge, this is the first report of CMV in T. repens in Korea.