• The Transactions of the Korean Institute of Power Electronics
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• v.13 no.4
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• pp.247-256
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• 2008

Regenerative energy generated by regenerative braking of DC traction can cause the system malfunction or damage to the rectifier, or malfunction of the power conversion device in power supply system by DC Line voltage rise in feeder line. Regenerative energy storage system using super capacitor is one of the ways to stabilize DC line voltage. In this paper, energy storage system of DC traction system using super-capacitor bank is implemented and using the field measurement data of the station N and the station S on the Line 2, the operation characteristics of line voltage caused by regenerative energy of electric trains are verified. Also, charge/discharge characteristics of super capacitor are verified as well. Thus, we can verify the operation characteristics of super-capacitor bank for regenerative energy storage system installed in DC Traction. And if we can use field measurement data of DC line voltage, we have obtained cost reduction. The stabilization of the system will be improved by measuring the operation characteristics of regenerative energy storage system in certain section operated by DC traction and predicting the capacity and lifetime of super-capacitor.

• Journal of Advanced Marine Engineering and Technology
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• v.30 no.3
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• pp.376-381
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• 2006

This study is experimented to observe an influence of experimental conditions on production characteristics of slurry ice by putting ball into test section to disturb ice adhesion. And at this experiment it used ethylene glycol-water solution and the concentration is 20wt%. The experimental apparatus was constructed of ethylene glycol-water solution and slurry ice storage tank. brine tank, pumps for ethylene glycol-water solution and brine circulating, a mass flow-meter data logger for fluid temperature measuring and a vertical circular tube with two copper tubes as test section. The experiments were carried out under various conditions, with mean velocity of fluid at the entry ranging from 0.07 to 0.13m/s and ball diameter is 10mm, 15mm. Also ball filling rate is 33%, 50%.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2006.06a
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• pp.49-50
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• 2006

This study experimented to observe an influence of experimental conditions on production characteristics of slurry ice by putting ball into test section to disturb ice adhesion. And at this experiment it used ethylene glycol-water solution and the concentration is 20wt%. The experimental apparatus was constructed of ethylene glycol-water solution and slurry ice storage tank, brine tank. pumps for ethylene glycol-water solution and brine circulating, a mass flow-meter, data logger for fluid temperature measuring and a vertical circular tube with two copper tubes as test section. The experiments were carried out under various conditions, with mean velocity of fluid at the entry ranging from 0.07 to 0.13m/s and ball diameter is 10mm, 15mm. Also ball filling rate is 33%, 50%.

• Journal of the Korean Society for Nondestructive Testing
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• v.3 no.1
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• pp.12-18
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• 1983

This paper describes the procedures and results of an acoustic emission testing performed during hydrotest of spherical pressure vessel for propane storage. A computer based multi-channel real time monitoring and source location analysis AET-4900 system was used for AE testing. The vessel was extremely quiet throughout the entire test run and especially 6 to $14.5kg/cm^{2}$, it is normal operating pressure range. After exceeding $14.5kg/cm^{2}$, one of the 20 sections showed the most event in any one section 11 total but there were scattered at different locations. In order to confirm the events seen in horizontal weld line of that section, proof testing was performed with ultrasonics and radiography.

• International Journal of Oral Biology
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• v.34 no.2
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• pp.49-52
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• 2009

Perception of sweet compounds is important for animals to detect external carbohydrate source of calories and plays a crucial role in feeding behavior of animals. Recent progress in molecular genetic studies provides evidence for a candidate receptor (heterodimers with taste receptor type 1 member 2 and 3: T1R2/T1R3), and major downstream transduction molecules required for sweet taste signaling. Several studies demonstrated that the sweet taste signal can be modulated by a satiety hormone, leptin, through its receptors expressed in a subset of sweet-sensitive taste cells. Increase of internal energy storage in the adipose tissue leads to increase in the plasma leptin level which can reduce activities of sweet-sensitive cells. In human, thus, diurnal variation of plasma leptin level parallels variation of taste recognition thresholds for sweet compounds. This leptin modulation of sweet taste sensitivity may influence individuals' preference, ingestive behavior, and absorption of nutrients, thereby plays important roles in regulation of energy homeostasis.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.316-319
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• 2021

블록체인은 블록체인 네트워크에 참여하는 모든 노드에 동일한 원장을 중복 저장함으로써 참여자 모두에게 데이터가 공개되며, 이를 통해 데이터의 투명성을 확보하고 참여자 다수의 합의를 통해 데이터의 신뢰성을 보장하는 기술이다. 현재의 블록체인 시스템은 이러한 데이터 소유의 탈중앙화를 통해 데이터의 신뢰성을 확보할 수 있게 되었으나, 합의, 저장, 분석 등 여러 방면에서 확장성 한계로 인해 주로 가상 자산의 거래에만 활용되고 있다. 본 논문은 다양한 일반 산업 및 비즈니스에서의 블록체인 기술의 활용성을 증대하기 위해 요구되는 데이터의 다양성, 대규모 용량, 대용량 데이터, 트랜잭션 처리 속도 등 저장 확장성 문제를 해결하기 위한 고확장성 블록체인 저장 기술을 제안하고 설계 개념 및 특징, 그리고 고확장성 저장 기술을 제공하기 위한 시스템 SW 구조를 제시한다.

• Journal of Veterinary Clinics
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• v.24 no.2
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• pp.218-224
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• 2007

Digital electrocardiogram (ECG) recorders are rapidly replacing to conventional paper ECG recorders. Digital ECG recorders have several advantages over conventional type ECG recorders, including better capability for data storage, better portability and better applicability in clinical settings. In this study, we presented 4 case studies related to cardiac rhythm disturbances, which were diagnosed and managed using a digital ECG recorder.

• Progress in Superconductivity and Cryogenics
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• v.12 no.1
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• pp.28-31
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• 2010

A magnetic field calculation method for toroidal type winding which has circular section was developed. At first, the equation for magnetic field by single filament coil was extended using numerical integration to estimate the entire interesting region of solenoid, especially winding region itself. And then, the magnetic field by toroidal arrangement of solenoids was computed with a coordinate transformation of vector fields. The superconducting magnet with toroidal arrangement can be made up of several tens of solenoid type double pancake windings for some applications such as superconducting magnetic energy storage system(SMES). In this system, the field calculation on the high-Tc superconducting(HTS) tape itself is very important because the entire system can be reached to a fault by magnetic stress of conductor or the critical current of superconducting tape can be dramatically reduced under its self field condition. To make matters worse, 3-dimensional analysis is indispensable for this type of magnet and the most of commercial programs with finite element method can be taken too much time for analysis and design. In this paper, a magnetic field calculation method for toroidal type winding with circular section was induced.

• Journal of Chest Surgery
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• v.23 no.2
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• pp.342-351
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• 1990

In recent years there are so many medical informations that surgeons should know to handle or analyze their large amount of surgical cases. Proper use of computer system offers new opportunities for the storage and manipulation of their hospital informations. But little is reported about which system, is appropriate, how much can we do with such a system, or what kind of work can be done with that, especially in the area of Thoracic and Cardiovascular Surgery section. Authors designed a computer-based patient file management system using 16 Bit AT IBM personal computer and dBASE IV program, and developed a coding system for the diagnosis and operation name, which offers the basis for the classification of the surgical patient data. And the result of some experiences which was got from the total surgical cases of Thoracic and Cardiovascular Section, Seoul District Armed Forces General Hospital during past 5years, was described.

• Ceramist
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• v.10 no.3
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• pp.86-90
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• 2007

Novel photochromic oxide glasses are presented in this section. These glasses are based on phosphate formers containing both tungsten and antimony atoms. Exposure to visible continuous or pulsed laser beam results in an intense photochromic effect witch is shown to occur in the volume of the glass and results in a broad absorption band in the visible and near infrared. This effect was not identified to be related with a structural change and is assumed to be entirely electronic. A change in the absorption coefficient is observed in function of tungsten content, exposure time and increases with beam power. These glasses have been investigated regarding the possibility of holographic data storage using visible lasers sources. Changes in both refractive index and the absorption coefficient were measured using a holographic setup. The modulation of the optical constants is reversible by heat treatment.