• Fire Science and Engineering
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• v.33 no.3
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• pp.74-83
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• 2019

In the U.S., the pressurization of elevator shaft was developed in 1972 to allow vulnerable people, such as the elderly and weak who could not use escape stairs in case of fire, to evacuate. It is an advantage in terms of space saving by not using vertical ducts. This study drew the problem of the pressurization of elevator shaft based on the existing domestic patents and proposed improvements. The smoke control volume calculation method is proposed by using vertical modeling. Leakage gaps in elevator doors need to be reviewed through experimental data or actual data. The evacuation floor was divided, the openings in the elevator machine room were automatically closed to the fire signal and the relief damper was installed to improve the performance. The improved method functions as the smoke control damper supplying the air flow rather than maintaining the differential pressure. To increase reliability of the research results, the procedure was performed to verify by using Contam.

• Journal of Food Hygiene and Safety
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• v.26 no.4
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• pp.383-387
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• 2011

The levels of migration of 1-hexene and 1-octene residues in PE (polyethylene) products were analyzed by Headspace gaschromatography (HSGC). A total of 21 samples were including lap, polyglove, zipper bag and ect. The samples were eluted with distilled water, 4% acetic acid, 20% ethanol and n-heptan. The limit of detection (LOD) was 0.06 mg/L ~ 0.30 mg/L and limit of quantitation (LOQ) was 0.21 mg/L ~ 1.01 mg/L, respectively. But because of the high volatile, n-heptan elution was not detected 1-hexene and 1-octene standard. 1-hexene and 1-octene were not detected in the sample which eluted with simulant at $60^{\circ}C$, 30min. Microwave for 1 minute also treated sample and direct heated at $100^{\circ}C$ without simulant were not detected.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.53 no.4
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• pp.499-505
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• 2020

We investigated growth, survival and stress response depending on salinity changes in hybrid grouper (Epinephelus fuscoguttatus ♀×E. polyphekadion ♂, BCG) juvenile. Experiment I (Exp I), the hybrids were stocked at 32 psu and reared for 30 days under decreasing salinity at a rate of 5-7 psu per day (25, 20, 15, 10, 5 psu). Experiment II (Exp II), the salinity was decreased from 32 psu to 5 psu during a period of 24, 48 and 72 h. Experiment III (Exp III), acclimatized BCGs were exposed from 5 psu to decreasing salinity at 0, 1, 2, 3, 4 psu. In the Exp I, 90% survival only in the 5 psu. Growth were 5 and 32 psu had significantly low growth than other treatment. In the Exp II 100% survived by the end of the experiment. The plasma cortisol level was highest in the treatment the salinity rapidly dropped, but all the treatment recovered quickly after 24 h of salinity reduction. In the Exp III, the lower the salinity, the faster the mortality occurred in salinity below 5 psu. It is therefore concluded that the BCGs are highly tolerant of low salinity and the salinity tolerance threshold is 5 psu.

• Journal of Advanced Navigation Technology
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• v.18 no.1
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• pp.101-106
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• 2014

Smart TV is to form a market of new industries along with the smartphone that appeared in the early 2000s. With the development of IT technology and the emergence of smart phones, user to pursue the application of high satisfaction. The smartphone has to meet the needs of the user in a variety of applications. However, Smart TV which led to a decrease in the development of a member of the application that reflect the needs of the user. Smart TV is popularized, the approach may be used instead of the application of high specification, the smart TV feel to be a smart are required to meet the needs of the user. Therefore in this paper, using the latest IT technology to provide a smart TV applications. This provides a feeling in conjunction as a system of one smart TV, smartphone, the exercise bike like to travel the distance of the actual user. For this reason to use WebOS, HTML5, Web sockets, the technology of Android.

• Journal of Advanced Navigation Technology
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• v.15 no.4
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• pp.632-639
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• 2011

Searching distributed resource efficiently is very important in distributed computing, cloud computing environment. Distributed resource searching may have system overheads and take much time in proportion to the searching number, because distributed resource searching has to circuit many peers for searching information. The open-source community project JXTA defines an open set of standard protocols for ad hoc, pervasive, peer-to-peer computing as a common platform for developing a wide variety of decentralized network applications. In this paper, we proposed peer search algorithm based on JXTA-Sim. original JXTA peer searching algorithm selected a loosely-consistent DHT. Our Lookup algorithm decreases message number of WALK_LOOKUP and reduce the network system overload, and we make a result of same performance both original algorithm and our proposed algorithm.

• Journal of Advanced Navigation Technology
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• v.16 no.2
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• pp.264-270
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• 2012

e-Training focusing on the experience and practice accelerates actual-active learning and enforces the learning effects against the existing theory based education. The most typical hans-on training system is augmented reality. Especially, in the training field installed augmented reality system, the automobile maintenance trainee experiences effective training with the immediate information, which is indicating the location of parts and the procedure of repairing. The tracking is the core technology of the augmented reality system. The performance of augmented reality system depends on the tracking technology. Therefore, this paper suggests the tracking technology which is proper to the e-Training augmented reality service technology for the car mechanics.

• Journal of Advanced Navigation Technology
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• v.18 no.4
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• pp.393-400
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• 2014

With developed countries, nationally the supply and development of electric vehicle(EV) has been going at a rapid pace. Now, the charger specifications, charging methods and standardization of communication protocols is going in each country and a lot of company are involved in the business about those. To popularize it as existing car, it is required to build the network and infrastructure which is proper for domestic environment. It should also need to be able to develop standardized protocols can be beyond the construction of the protocol of the upper stage server and charger, and is used in a residential environment actually applied to related industries. Therefore, in this paper, we propose a home network model of EV that raised the need for a study of the charging system for EV, using M2M technology and multi-charging system tailored to the residential environment of our country.

• Journal of Advanced Navigation Technology
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• v.12 no.6
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• pp.583-590
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• 2008

U-AD using Mobile RFID is service of new concept. It will be able to provide a service to the user by reading Tag information which is attach in the CDs, the books and medical supply etc. with cellular phone equipped with RFID device which is available for reading RFID tags. Applies like this service and when reacting Tag with RFID Readers of the cellular phone, the advertisement contents which is not the possibility of seeing fragmentarily in the outside develops the service which is the possibility with the cellular phone of seeing at real-time with aim. U-AD using Mobile RAD detail shows product information by cell phone, user exactly knows desire product and looks forward purchasing efficiently. Also advertiser benefit from U-AD using Mobile RFID since advertises effects of product sufficiently are increased. And then it expands demand on product.

• Journal of Advanced Navigation Technology
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• v.18 no.6
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• pp.569-575
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• 2014

Since 2009 the number of users of smart phones and tablet PC is growing exponentially. In particular Apple's iOS and Google's Android OS are the heart of this remarkable growth, most of smart phone and tablet PC are designed to operate based on these two OS. Such increasing use of smart devices has led to changes in the social environment that allows, without the constraints of time and place. However, such development does not supply only ease to do something, even compared to past, financial fraud and information leakage are easier than before by variety of new types of attack for example phishing, pharming, smishing and qshing. So according to this paper, analyzes for smishing attack, propose a countermeasure system of the technical way and proved its higher performance compare to the existing method.

• Journal of Advanced Navigation Technology
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• v.22 no.5
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• pp.456-461
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• 2018

Until the 4th Industrial Revolution fused the Web with diverse technologies, the only factor in evaluating the performance of a Web application was the loading speed of the Web application. Therefore, most existing Web application performance analysis tools focus on the speed at which Web applications run in a Web browser. However, the web is now being used not only in a simple web browser but also in a variety of services. So, in addition to simple speed, there are more elements to be checked to evaluate web applications. Therefore, in this paper, we design a server to perform web application performance analysis considering progressive web app, accessibility, best practice, and search engine optimization as well as the above mentioned speed. Also, we realize a REST API based server that can provide web application performance services without being affected by user's devices or environment.