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Recent research towards integrated deterministic-probabilistic safety assessment in Korea

  • Heo, Gyunyoung;Baek, Sejin;Kwon, Dohun;Kim, Hyeonmin;Park, Jinkyun
    • Nuclear Engineering and Technology
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    • v.53 no.11
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    • pp.3465-3473
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    • 2021
  • For a long time, research into integrated deterministic-probabilistic safety assessment has been continuously conducted to point out and overcome the limitations of classical ET (event tree)/FT (fault tree) based PSA (probabilistic safety assessment). The current paper also attempts to assert the reason why a technical transformation from classical PSA is necessary with a re-interpretation of the categories of risk. In this study, residual risk was classified into interpolating- and extrapolating-censored categories, which represent risks that are difficult to identify through an interpolation or extrapolation of representative scenarios due to potential nonlinearity between hardware and human behaviors intertwined in time and space. The authors hypothesize that such risk can be dealt with only if the classical ETs/FTs are freely relocated, entailing large-scale computation associated with physical models. The functional elements that are favorable to find residual risk were inferred from previous studies. The authors then introduce their under-development enabling techniques, namely DICE (Dynamic Integrated Consequence Evaluation) and DeBATE (Deep learning-Based Accident Trend Estimation). This work can be considered as a preliminary initiative to find the bridging points between deterministic and probabilistic assessments on the pillars of big data technology.

A Study on the Spatial Characteristic and Changing Process of Busanjin Fortress (부산진성(釜山鎭城)의 공간구성과 변화과정 연구)

  • Song, Hye-Young;Seo, Chi-Sang
    • Journal of architectural history
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    • v.28 no.4
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    • pp.37-46
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    • 2019
  • Busanjin Fortress was originally made of stone fortress for the Joseon Navy, which was located in Dongnae area in the late Joseon Dynasty. However, the Japanesque Castle of Busanjin in 1592 was built by the Japanese military during the Japanese Invasion of Korea. Since the Japanese military retreated, the Joseon Navy had renovated the fortress and had used it as a base for stationing, and it had been maintained in Busanjin Fortress until the Joseon Navy was disbanded in 1895. After the abolition of the Naval Force System, the space in Busanjin Fortress was dismantled, and the government facilities and their sites were not properly managed and repaired, eventually was sold to Japanese. As Busanjin Fortress failed to function properly, the coastal space in Busanjin became a burial ground after being reclaimed by Japanese with real estate investment in mind. Today, the traces of Busanjin Fortress have been removed by the reclamation work, and only the remains of some stone pillars remain under the name of Jaseongdae(子城臺). Thus, the old custom as the Naval base disappeared, leaving only the image of Japanesque Castle.

Prevalence of ischemic heart disease with respect to lifestyle changes in diagnostic patients of CAD

  • Shaik, Mohammad akram;Ahmad, Mohd hameed;Parray, Shabir ahmad;Zohaib, Sharique
    • CELLMED
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    • v.8 no.4
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    • pp.19.1-19.5
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    • 2018
  • A majority of the peoples in Indian cities depend on high fat diet, smoking, ghutka chewing and improper sleep, these all are lifestyle changes, can cause ischemic heart disease. Globally, ischemic heart disease (IHD) is the leading killer. Unani System of medicine not only provides well-based medical cures for diseases, but its holistic approaches as it possess unique principles of diet, lifestyle and particularly therapeutics, to balance and enrich all aspects of physiology and psyche. All diseases are the result of poor management of the six governing (or essential) factors, beyond the ability of physics or Tabiat to maintain and restore homeostasis. In this context, lifestyle diseases can be prevented by conscious changes to the person's diet, behavior and environment. The holistic approach of Unani medicine is well placed to cover the two main pillars of lifestyle diseases, namely, prevention and treatment. In this paper, we report on the prevalence of CAD in patients with known diagnosis of CAD and try to find out its relationship with different lifestyle changes.

Low Resistance SC-SJ(Shielding Connected-Super Junction) 4H-SiC UMOSFET with 3.3kV Breakdown Voltage (3.3kV 항복 전압을 갖는 저저항 SC-SJ(Shielding Connected-Super Junction) 4H-SiC UMOSFET)

  • Kim, Jung-hun;Kim, Kwang-Soo
    • Journal of IKEEE
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    • v.23 no.3
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    • pp.756-761
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    • 2019
  • In this paper, we propose SC-SJ(Shielding Connected-Super Junction) UMOSFET structure in which p-pillars of conventional 4H-SiC Super Junction UMOSFET structures are placed under the shielding region of UMOSFET. In the case of the proposed SC-SJ UMOSFET, the p-pillar and the shielding region are coexisted so that no breakdown by the electric field occurs in the oxide film, which enables the doping concentration of the pillar to be increased. As a result, the on-resistance is lowered to improve the static characteristics of the device. Through the Sentaurus TCAD simulation, the static characteristics of proposed structure and conventional structure were compared and analyzed. The SC-SJ UMOSFET achieves a 50% reduction in on-resistance compared to the conventional structure without any change in the breakdown voltage.

Study on Structure Design of High-Stiffness for Multi-Function Automatic Lathe Bed (다기능 자동 선반 베드의 고강성 구조설계에 관한 연구)

  • Jo, Eun-Jeong;Lee, Yun-Chul;An, Jong-Bok;Lee, Yeong-Sik;Lee, Jae-Kwon;Kim, Kwang-Sun
    • Journal of the Semiconductor & Display Technology
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    • v.18 no.1
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    • pp.112-116
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    • 2019
  • This study was carried out by structural analysis using finite element method for designing high rigidity structure of multi - functional automatic lathe bed. As a result of comparison, it was confirmed that the weight was designed to be higher than the maximum deformation amount. The shape and dimensions of the main pillars and walls of the bed were changed to derive the most suitable design for the multifunction automatic lathe bed. A model of structural design was derived with the goal of minimizing the maximum deformation amount of $20{\mu}m$ or less and the weight of the bed. As a result of applying the derived design improvement proposal to the multifunctional automatic lathe bed, 57.4% weight reduction and maximum principal stress decreased by 45.0% than the initial design model. It is expected that the optimum design that meets these design conditions will reduce the weight of the structure as well as improve the safety of the structure and reduce the machining error in the operation of the machine tool.

Study on Reduction of Excessive Noise and Vibration of Aft Part of High Speed Ro-Ro Passenger Ship (고속 여객선 선미부 과대 진동/소음 감소를 위한 연구)

  • Shin, Yunkil
    • Journal of Ocean Engineering and Technology
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    • v.33 no.2
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    • pp.196-202
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    • 2019
  • In this study, the excessive noise and vibration phenomena of a high-speed Ro/Ro passenger ship were analyzed, and a countermeasure was taken based on them. This ship was granted a comfort class notation by the classification society, which was COMFORT-VIBRATION-II and COMFORT-NOISE-CREW-II. However, unfortunately, excessive noise and vibration in the aft part of the ship were delivered from the twin shaft propellers, and therefore the Class Requirement was not satisfied before delivery. In order to obtain the class notation, all of the concerned parties came to an agreement to reduce the noise and vibration level during operation after delivery because a seasonal ferry service was already scheduled and the cabin was fully booked. The root cause of the massive amount of noise and vibration was mainly the propeller-induced excitation pulse and beating that occurred from the mismatch of the rotating speeds of the two shaft lines. A 1st order vibrating force and beating phenomena existed in the propeller. Thus, a reduction of the excitation force, elimination of the beating phenomena, and decrease of the noise level at the aft area cabins and public spaces were required. In addition, structural reinforcements were conducted using pillars and additional girders at the aft part of the decks.

The Effect of Banking Industry Development on Economic Growth: An Empirical Study in Jordan

  • ALMAHADIN, Hamed Ahmad;AL-GASAYMEH, Anwar;ALRAWASHDEH, Najed;ABU SIAM, Yousef
    • The Journal of Asian Finance, Economics and Business
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    • v.8 no.5
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    • pp.325-334
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    • 2021
  • This study aims to investigate whether economic growth is elevated by banking industry development in Jordan. The study adopts time-series econometric methodologies, which comprise the bounds testing approach within the autoregressive distributed lag (ARDL) and the conditional causality analysis. Consistent with the assumptions of the adopted methodology, the study utilized annual time-series data for a relatively long period of thirty-nine years, between 1980 and 2018. The empirical results show that Jordan's economic growth is strongly responsive in respect to any changes in banking industry development. Also, the results reveal the harmful impact of rising lending interest rate; as this rate increases, economic growth will decrease. The findings are in line with the conceptual arguments of the supply-leading hypothesis, which confirmed that banking development is considered as one of the main pillars that have stimulating effects on economic growth. The evidence of the current study may provide important implications for policymakers and bankers. Those professionals should work to maintain a stable regulatory system that enhances the banking system function in activating economic growth. Also, a considerable focus should be placed on designing a steady interest rate policy to avoid the inherently undesirable impacts of high-interest rates on the Jordanian economy.

A Study on the Safety for Pedestrians Waiting for Signal (보행신호를 대기하는 보행자의 안전에 관한 연구)

  • Kim, Hansol;Baek, Seryong;Choi, Yongsoon;Yoon, Junkyu;Lim, Jonghan
    • Journal of Auto-vehicle Safety Association
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    • v.13 no.3
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    • pp.41-46
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    • 2021
  • The number of big traffic accident cases of pedestrian death appeared to be minor, however compared to death rate in car to car accidents is very high and quite a few of the pedestrian death rates among all traffic accidents are counted to be almost 40%. Previous pedestrian safety studies were mostly aimed at reducing the degree of pedestrian injuries from a vehicle to pedestrian collision, and less at preventing a collision itself. This research was conducted with a method of using road facilities to prevent vehicles from rushing into the sidewalk. This research used one of the collision analyzing programs, called PC-Crash to simulate the vehicle rushing into the sidewalk. Based on the program, it could derive an optimal safe zone location where the pedestrian can wait for the pedestrian light safely. Also, changing road facilities such as pedestrian light pillars or signal controllers can widen 440% compared to the present safe zone. Accordingly, researchers have to consider a method to analyze and apply pedestrian safe zones along with road facilities location when designing a road.

Technological Readiness and Innovation as Drivers for Logistics 4.0

  • MOLDABEKOVA, Aisulu;PHILIPP, Robert;SATYBALDIN, Azimkhan A.;PRAUSE, Gunnar
    • The Journal of Asian Finance, Economics and Business
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    • v.8 no.1
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    • pp.145-156
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    • 2021
  • The research purpose of this paper is to empirically examine the effects of technological readiness and innovation on logistics performance. To build up and maintain an important role in global supply chains, nowadays it is obvious that countries and logistics providers need to achieve competitive advantage in terms of digitalization. However, there is a lack of empirical studies about the impacts of information technologies and innovation potential on the logistics efficiency of countries. Hence, the study analyzes whether the corresponding pillars of the Global Competitiveness Index (GCI) matter for the Logistics Performance Index (LPI) and its dimensions. For determining the effects, the pooled regression approach is applied. The results show that technological readiness and innovation are positively and statistically significantly correlated with logistics performance: competence and quality of logistics services, efficiency of customs clearance processes, ability to track and trace consignments, frequency with which shipments reach consignee within scheduled or expected time, and ease of arranging competitively priced shipments. The findings of this study suggest that investments in innovations and technology progress improve countries' logistics efficiency, which is an important prerequisite for enabling Logistics 4.0 and thus, Industry 4.0 and the digital transformation of the economy and society.

The Composite Structure Characteristics of the Formerly the Busan Branch of Toyo Takushoku Co.(Busan Modern History Museum) (구 동양척식주식회사 부산지점(부산근대역사관)의 복합구조 특성)

  • Ahn, Jae-Cheol
    • Journal of the Architectural Institute of Korea Planning & Design
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    • v.35 no.10
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    • pp.63-70
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    • 2019
  • The Busan branch of the former Toyo Takushoku Co. carried out the same business as a bank at the time of construction. This required an open space of long-span, which had no pillars, on the first floor where many customers frequently visited. In addition, an office space is required in the upper part, and a column is arranged so as to place a corridor in the center. It was designed with modern complex structures for space utilization and structural adaptation. As a result, scientific structural calculations of the modern era began and various structural technologies were introduced, the rationalization and value of various spatial characteristics and their structural design were analyzed from a technical historical perspective in the structure requiring long-span space. The Busan branch of the former Toyo Takushoku Co. is a complex structure with three structures. It is highly valuable as a building that tried to design its structure in a variety of spaces through calculation and introduction of new technology based on the principle of force in modern times.