• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.1
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• pp.34-39
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• 2007

According to the active use of internet the need for security in various environment is being emphasized. Moreover with the broad use of Messenger on PC and P2P applications. the security and management of individual hosts on internet became very important issues. Therefore in this paper we propose the design and implementation of a host based access control system for the hosts on internet including window based PC which provides access control, information on packets, and record and monitoring of log files.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.1068-1071
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• 2012

무선 인터넷의 접근성 개선과 스마트폰의 등장으로 인해 개인 컴퓨팅 환경이 PC 중심에서 모바일 중심으로 이동하고 있다. 이에 따라, PC 환경에서 존재하던 클라우드 서비스를 모바일 환경에 적용한 모바일 클라우드 서비스가 새롭게 부각되었다. 모바일 클라우드 서비스란 사용자의 모바일 단말기로 언제 어디서나 일반 PC와 동일한 환경의 컴퓨팅 환경을 사용할 수 있는 서비스를 의미한다. 하지만 일반적인 PC 환경에서 사용하던 서비스를 성능이 낮은 모바일 단말에서 수행함으로써 수행시간, 통신 지연 등의 여러 문제가 발생한다. 본 논문에서는 모바일 클라우드 환경에서 통신의 보안을 보장하기 위한 다양한 기술들의 사용과 이러한 기술 사용에 관한 성능에 따른 효율적인 키 교환 방식을 제안한다.

• Perinatology
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• v.29 no.4
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• pp.175-179
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• 2018

Pneumatocele (PC) is a thin-walled cyst of the lung that can occur at all ages and with various etiologies. However, there is no fully accepted consensus for the management of PC in a neonatal intensive care unit. Although the management of PC is generally expectant, it is difficult to decide how long conservative management should be maintained, especially under Korea's medical care environment and the parents' worry and anxiety. We report a male neonate, born at $27^{+5}weeks$ gestation, weighing 1,000 g, who had a post infectious PC caused by methicillin-resistant Staphylococcus aureus sepsis. We treated conservatively for about 100 days (roughly 14 weeks), but unfortunately after a few days of chest retraction, acute exacerbation occurred, video assisted thoracoscopic surgery (VATS) was deemed necessary and performed. The purpose of this publication is to describe the clinical course, aggravation and relief after VATS management with a review of the literature.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.1040-1041
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• 2007

본 논문은 차세대 위성 개발을 위한 선행 연구의 일환으로, 다양한 플랫폼에 적용할 수 있는 위성 전자 전산 시스템 개발 검증 장비의 구성 요소인 상/하향 명령 처리 장치를 PC 에서 구동할 수 있도록 개발한 것이다. 이 PC 기반의 상/하향명령처리 시험환경은 위성의 Flight Software 로직의 검증용으로도 활용될 수 있다.

• Membrane Journal
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• v.21 no.3
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• pp.256-262
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• 2011

This study describes the performance of PSF and PC membranes for separation and recovery of $SF_6$ from gas mixtures (10% $SF_6$/70% $N_2$/19% $O_2$/1% $CF_4$) containing low concentration of $SF_6$. The $SF_6$ concentration in retentate, recovery efficiency and selectivity of mixed gases were measured as a function of retentate flow rate and temperature. The concentration of $SF_6$ in the gas recovered from PSF and PC membrane respectively decreased with increase of retentate flow rate and increased with increase of temperature. The values of $SF_6$ concentration in retentate of PSF membrane were higher than those of PC membrane at constant experimental conditions. The maximum value of recovery efficiency of PSF and PC membranes are 95.9% and 67.8%, respectively, under 298.15 K and 150 cc/min of retentate flow rate. With the exception of $CF_4/SF_6$, the real selectivities of $N_2/SF_6$ and $O_2/SF_6$ at PSF membrane were higher than those of PC membrane.

• Journal of the Korea Convergence Society
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• v.9 no.4
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• pp.9-14
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• 2018

Recently, as the internet speed is getting faster, in the cloud environment, the service receiving device is changing from a general PC to a compact device such as a mobile phone or a tablet PC. Since handheld devices such as mobile phones or tablet PCs are often used in wireless rather than wired, there are many problems that personal information may be exposed maliciously from a third party. In this paper, we propose a user privacy protection scheme through a duplicate duplicate key generation process which can safely protect user 's privacy from third party among cloud services being served through various wireless media. The proposed scheme is used to synchronize the duplicated key between the server and the intermediary device, and aims at shortening the time of the authentication process protecting the user 's privacy. In this case, the proposed scheme uses Interleave() function and random number to synchronize the server and the intermediary device, so it can safely prevent the malicious attack of the third party.

• Journal of Soil and Groundwater Environment
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• v.21 no.6
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• pp.135-145
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• 2016

MgO recently has been regarded as the alternative material for replacement of cement. The aim of this study is to investigate the effects of accelerated carbonation on the strength development of MgO-based binder which is binary mixtures of magnesium oxide (MgO) with portland cement (PC) or ground granulated blast furnace slag (GGBS) or fly ash (FA). The compressive strengths of all binders were higher in the 20% $CO_2$ condition and for longer curing time. The strength were generally higher as the following order: MgO/PC > MgO/GGBS > MgO/FA system. The binder composed of 20% MgO and 80% PC showed highest compressive strength (38.0MPa) which was higher than PC. The correlation analysis of the porosity and compressive strength showed that compressive strength was higher when porosity was lower. The hydration and carbonation products of MgO including brucite ($Ca(OH)_2$), magnesite ($MgCO_3$) and nesquehonite ($MgCO_3{\cdot}3H_2O$) presumably filled the pores and contributed to strength development. Thermogravimetric analyses elucidated that 0.34 kg of $CO_2$ could be stored the 50% MgO/50% PC binder which performed the maximum $CO_2$ uptake at 20% $CO_2$ condition.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.46 no.11
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• pp.969-973
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• 2018

Avionics OFP runs on the mission computer and can be operated by interacting with several avionics equipments. In order to verify OFP SW, SIL having real avionics equipments or models is absolutely necessary. Therefore in many cases SIL is implemented concurrently with OFP developing, and only one SIL is provided to developers. So developers sometimes need an alternative to SIL for verifying requirements in the middle of development process. In this paper, we propose a single PC based STE SW that simulates interworking equipments and verifies OFP in a single PC environment without actual interworking equipments or SIL HW interfaces.

• Korean Journal of Construction Engineering and Management
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• v.22 no.6
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• pp.96-106
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• 2021

The PC structure based on the OSC (Off-Site Construction) is mentioned as a representative method of innovation in the construction industry that converts the existing construction environment from site-centered to factory production-transportation-site assembly. However, recent research on PC method has focused on improving the functions of subsidiary materials and improving the production system to increase productivity and institutional / policy R&D that can be universally applied to the life-cycle stage of ordering / design /construction is insufficient. In particular, the absence of standardized cost calculation standards makes it difficult to calculate and verify of objectified appropriate construction cost. So which is an obstacle to the activation of the PC method. In this study, the standards for construction costs of domestic and foreign PC method were surveyed and similar Construction Standard Production Rates were analyzed to confirm the product structure suitable for PC method. Subsequently, the construction procedures and input resources for each PC subsidiary materials were identified through on-site surveys to derive component for subsidiary materials, and the factors of change in the product according to the construction characteristics(height, weight of subsidiary material) were verified. As a result the standard product calculation system suitable for the site installation of the PC method for apartment was presented.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.9 no.3
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• pp.285-290
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• 2016

In rural area, our farmers confront decreasing benefits owing to imported crops and increased cost. Recently, the government encourage the 6th Industry that merges farming, rural resources, and information and communication technology. Therefor the government makes an investment in supplying 'smart greenhouse' in which a farmer monitor growing crops and environment information to control growing condition. The objective of this study is developing an Moving Monitor and Control System for crops in green House. This system includes a movable sensing unit, a controlling unit, and a server PC unit. The movable sensing unit contains high resolution IP camera, temperature and humidity sensor and WiFi repeater. It rolls on a rail hanging beneath the ceiling of a green house. The controlling unit contains embedded PC, PLC module, WiFi router, and BLDC motor to drive the movable sensing unit. And the server PC unit contains a integrated farm management software and home pages and databases in which the images of crops and environment informations. The movable sensing unit moves widely in a green house and gathers lots of information. The server saves these informations and provides them to customers with the direct commercing web page. This system will help farmers to control house environment and sales their crops in online market. Eventually It will be helpful for farmers to increase their benefits.