• Title/Summary/Keyword: SBD

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How to enhance the security and operation of Self Bag Drop systems (SBD(Self Bag Drop) Systems의 보안 및 운영 개선 방안에 대한 연구)

  • Kim, Ha-na;Kwon, Pilje;Lee, Kang-seok
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.26 no.3
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    • pp.55-65
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    • 2018
  • The SBD systems have made it possible that all boarding procedures are completed by passengers. With the SBD, air tickets can be issued and baggage can be consigned without the help of airline officers. This way, the SBD can improve the passenger circulation speed as well as decrease the time for passengers to wait for check-in, which is connected to the reduction of airlines' operaitonal costs. However, given that the SBD is a new technology, it has potentials to be used as a tool for air terrorism. This study purposes to determine methods to enhance the security and operation of SBD systems. With the aim, this paper investigated the existing literature on SBDs, self-check-in, airport security, air terrorism, risk management, aviation accidents, and information security. In order to compile real-time information about the SBD operations, twelve airports in North America, Europe, and Asia were analyzed based on existing studies on international SBD trends.

Effect on Metal Guard Ring in Breakdown Characteristics of SiC Schottky Barrier Diode (금속 가드 링이 SiC 쇼트키 다이오드의 항복전압에 미치는 영향)

  • Kim, Seong-Jin
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.18 no.10
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    • pp.877-882
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    • 2005
  • In order to fabricate a high breakdown SiC-SBD (Schottky barrier diode), we investigate an effect on metal guard ring (MGR) in breakdown characteristics of the SiC-SBD. The breakdown characteristics of MGR-type SiC-SBD is significantly dependent on both the guard ring metal and the alloying time of guard ring metal. The breakdown characteristics of MGR-type SiC-SBDs are essentially improved as the alloying time of guard ring metal is increased. The SiC-SBD without MGR shows less than 200 V breakdown voltage, while the SiC-SBD with Al MGR shows approximately 700 V breakdown voltage. The improvement in breakdown characteristics is attributed to the field edge termination effect by the MGR, which is similar to an implanted guard ring-type SiC-SBD. There are two breakdown origins in the MGR-type SiC-SBD. One is due to a crystal defects, such as micropipes and stacking faults, in the Epi-layers and the SiC substrate, and occurs at a lower electric field. The other is due to the destruction of guard ring metal, which occurs at a higher electric field. The demolition of guard ring metal is due to the electric field concentration at an edge of Schottky contact metal.

Sleep-related Breathing Disorder and Its Relationship with Temporomandibular Disorders: Literature Review

  • Park, Jeongryul;Lee, Seunghoon;Lee, Sanghoon;Choi, Doyoung
    • Journal of TMJ Balancing Medicine
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    • v.7 no.1
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    • pp.1-10
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    • 2017
  • In order to establish a relationship between sleep related breathing disorder (SBD) and temporomandibular disorders (TMDs), a literature review was performed. A researching was performed based on PubMed, including english languages. Any clinical study identified relationship between SBD and TMD were selected in this review. 13 studies were analyzed in this review. According to SBD diagnosis, articles were grouped as follows: polysomnographic diagnosis (n=7), clinical diagnosis (n=2) and survey/self-report (n=4). 12 articles established a positive relation between SBD and TMD and 1 did not. SBD would be associated with protrusion/retrusion degree, myofascial pain, muscular and joint pathology, and other orofacial findings. It was analyzed that the retrusion of the mandible had the significant influence on the severity of the SBD.

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The Effects of SBD-1 on Hangover Syndrome : a Randomized Double-blind Crossover Preliminary Study (신선불취단(神仙不醉丹) 가감방(加減方)의 숙취 예방효과에 대한 이중맹검 무작위배정 교차임상 예비연구)

  • Jeong, Hyun-Suk;Kang, Sei-Young;Han, Hyun-Jin;Jang, In-Soo
    • The Journal of Internal Korean Medicine
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    • v.33 no.4
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    • pp.511-519
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    • 2012
  • Objectives : This study investigated the effect of Sinseonbulchuidan (SBD-1) on hangover syndrome. We undertook this study to test whether SBD-1 is effective in preventing the signs and symptoms of alcohol-induced hangover. Methods : Fifteen healthy volunteers participated in this double-blind randomized crossover study. All participants received either SBD-1 or indistinguishable placebo capsules before alcohol consumption. The primary outcome measure was the difference in hangover severity scores between SBD-1 and placebo intervention. Secondary outcome measure was the difference in profile of mood states (POMS) between SBD-1 and placebo intervention. Results : After alcohol exposure, the overall symptom scores were significantly decreased in the SBD-1 group compared with those given a placebo. The mean scores for the hangover symptoms were high in the placebo group, and statistical significance was observed in 4 symptom scores (loss of appetite, stomachache, nausea, and total score). There were no differences in the POMS and cognitive performance test results between SBD-1 and placebo intervention. Conclusions : We conclude that the SBD-1 is effective in preventing the signs and symptoms of alcohol-induced hangover. Larger studies are required to confirm these findings.

A Study on the Adoption of Self Bag-Drop System to Enhance Airport Operation (공항운영 향상을 위한 Self Bag-Drop System(무인수하물처리시스템) 적용가능성 연구)

  • Lee, Kang-Seok;Ji, Min-Seok
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.23 no.2
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    • pp.75-83
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    • 2015
  • Advanced countries in the aviation industry, especially the United States and European Union, develop and commercialize their own SBD system integrated with IT convergence technology, dominating the international market. Nevertheless, most of SBD technologies in domestic airports rely on other countries. It is imperative that internal airport operators introduce the Self Bag Drop system and produce, apply, and manage the most optimized SBD system for airports and airlines. Upon analyzing the tendency and operation of the SBD system utilized in leading international airports, this is conducted to address the possibility of the future implementation in domestic airports.

An Analysis of RF-DC Converter Circuits with GaN Schottky Barrier Diodes (GaN-SBD를 이용한 RF-DC 변환기 회로 분석)

  • Son, Myung Sik
    • Journal of the Semiconductor & Display Technology
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    • v.20 no.4
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    • pp.68-71
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    • 2021
  • In this paper, GaN-SBD devices with excellent breakdown voltage and frequency characteristics for use in high-power microwave wireless power transmission has been modeled for PSpice circuit simulation. The RF-DC conversion circuits were simulated and compared with a commercial Si-SBD device. Although the modeled GaN-SBD devices had lower RF-DC conversion efficiency compared to Si-SBD at 2.4 and 5.8 GHz, it was confirmed through PSpice circuit simulations that they can be used sufficiently according to the required application circuit in a high power situation.

Comparison of Electrical Properties of β-Gallium Oxide (β-Ga2O3) Power SBDs with Guard Ring Structures (Guard Ring 구조에 따른 β-산화갈륨(β-Ga2O3) 전력 SBDs의 전기적 특성 비교)

  • Hoon-Ki Lee;Kyujun Cho;Woojin Chang;Jae-Kyoung Mun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.37 no.2
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    • pp.208-214
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    • 2024
  • This reports the electrical properties of single-crystal β-gallium oxide (β-Ga2O3) vertical Schottky barrier diodes (SBDs) with a different guard ring structure. The vertical Schottky barrier diodes (V-SBDs) were fabricated with two types guard ring structures, one is with metal deposited on the Al2O3 passivation layer (film guard ring: FGR) and the other is with vias formed in the Al2O3 passivation layer to allow the metal to contact the Ga2O3 surface (metal guard ring: MGR). The forward current values of FGR and MGR V-SBD are 955 mA and 666 mA at 9 V, respectively, and the specific on-resistance (Ron,sp) is 5.9 mΩ·cm2 and 29 mΩ·cm2. The series resistance (Rs) in the nonlinear section extracted using Cheung's formula was 6 Ω, 4.8 Ω for FGR V-SBD, 10.7 Ω, 6.7 Ω for MGR V-SBD, respectively, and the breakdown voltage was 528 V for FGR V-SBD and 358 V for MGR V-SBD. Degradation of electrical characteristics of the MGR V-SBD can be attributed to the increased reverse leakage current caused by the guard ring structure, and it is expected that the electrical performance can be improved by preventing premature leakage current when an appropriate reverse voltage is applied to the guard ring area. On the other hand, FGR V-SBD shows overall better electrical properties than MGR V-SBD because Al2O3 was widely deposited on the Ga2O3 surface, which prevent leakage current on the Ga2O3 surface.

Isolation and Identification of Growth Inhibition Substance on L. monocytogenes from Dystaenia takesimana Kitagawa (섬바디로부터 L. monocytogenes에 대한 생장억제 물질의 분리 및 구조동정)

  • Oh, Jin-Ah;Shin, Dong-Hwa;Baek, Nam-In
    • Korean Journal of Food Science and Technology
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    • v.31 no.4
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    • pp.984-993
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    • 1999
  • The ethanol extracts and its n-hexane fraction of Dystaenia takesimana Kitagawa exhibited growth inhibition on Listeria monocytogenes ATCC 19111, ATCC 19112, ATCC 19113, ATCC 19114 and ATCC 15313. The minimum inhibitory concentration of the ethanol extract and its n-hexane fraction were 50 ppm and below 30 ppm on Listeria monocytogenes respectively. By silica gel column chromatography, the active fraction A8 was obtained from the ethanol extract of Dystaenia takesimana Kitagawa. After three times of column chromatography, the SBD-1 and SBD-2 were separated from the A8 fraction of the ethanol extract of Dystaenia takesimana Kitagawa. Antimicrobial activity of the SBD-l and SBD-2 was lower than that of the A8. And the A8 exhibited growth inhibition on five strains of Listeria monocytogenes at the level of $10{\sim}30$ ppm and the bactericidal effect was confirmed at same the level. The purified antimicrobial active compound was identified as (9z)-heptadeca-l,9-dien-4,6-diyn-3,8-diol, falcarindiol, by EI/MS, $^{1}H-NMR$ and $^{13}C-NMR$.

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Impact of postoperative dietary types on nutrition and treatment prognosis in hospitalized patients undergoing oral and maxillofacial surgery: a comparative study

  • Sung Bin Youn;Se-Hui Ahn;Dong-Ho Cho;Hoon Myoung
    • Korean Journal of Community Nutrition
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    • v.29 no.2
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    • pp.129-143
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    • 2024
  • Objectives: The objective of this study is to compare a nutritionally balanced soft blend diet (SBD) with a soft fluid diet (SFD) on the health of inpatients who have undergone oral and maxillofacial (OMF) surgery, ultimately aiming to enhance care outcomes, improve health-related quality of life (QOL), and increase satisfaction with the hospital. Methods: Thirty-two patients were randomized into two groups: sixteen received SFD and sixteen received SBD. Anthropometric, laboratory evaluations were conducted upon admission and discharge. Patients filled out questionnaires on demographics, diet satisfaction, food intake amount, and health-related QOL on the day of discharge, assessed using the EuroQoL 5 Dimensions 3 Level and EuroQoL Visual Analogue Scale (EQ-VAS) instruments. Data were analyzed with descriptive statistics, χ2 tests for group differences, and paired nonparametric t-tests for within-group comparisons. The Mann-Whitney U test evaluated inter-group differences in preoperative weight and body mass index (BMI), postoperative changes, meal satisfaction, intake, health-related QOL, and self-assessed health status. P-values were set at a significance level of 0.05. Results: The SBD group had higher dietary intake (63.2% vs. 51.0%) and greater diet satisfaction (80.6 vs. 48.1, P < 0.0001) compared to SFD group. Health-related QOL, measured by EQ-VAS, was better in SBD group (70.3 vs. 58.8, P < 0.05). Postoperative weight and BMI decreased in SFD group but increased in SBD group (P < 0.01). Changes in laboratory results showed more stability in the SBD group. No postoperative infections were reported in SBD group, whereas SFD group had a 31.25% complication rate. Conclusions: While SFD is often recommended after OMF surgery to protect oral wound healing process, our study reveals that SBD not only enhances physical and psychological outcomes but also, somewhat unexpectedly, supports wound healing and reduces complications. Essentially, SBD promotes physical recovery and enhances health-related QOL than SFD by supporting both somatic and mental healing aspects.

(Power Loss Characteristics in MOSFET Synchronous Retifier with Schottky Barrier Diode) (SBD를 갖는 MOSFET 동기정류기 손실특성)

  • Yoon, Suk-Ho;Kim, Yong
    • Proceedings of the KIEE Conference
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    • 1999.07f
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    • pp.2568-2571
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    • 1999
  • Recently, new trend in telecommunication device is to apply low voltage, about 3.3V-1.5V. However, it is undesirable in view of high efficiency and power desity which is the most important requirement in the distributed power system. Rectification loss in the output stage in on-board converter for distributed power system are constrained to obtain high efficience at low output voltage power suppies. This paper is investigated conduction power loss in synchronouss rectifier with a parallel -connected Schottky Barrier Diode(SBD). Conduction losses are calculated for both MOSFET and SBD respectively. The SBD conduction power loss dissipates more than the MOSFET rectifier conduction power loss.

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