• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.6B
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• pp.474-482
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• 2012

Mobile Gateway(MG) is a wireless LAN device to provide internet services to a passenger on vehicles like a bus. For using internet services, MG connects the Road Side Unit AP(RSU AP) based on WLAN .To provide a stable communication service on the moving vehicle, handoff changing MG's RSU must be handled fast and stably. However, it has a physical limits to remove a disconnection time of handoff process by reason of its technological features. In this paper, we suggest a MIMG(Multi-Interface Mobile Gateway) executing seamless handoff by using multiple wireless LAN interfaces for connecting RSU. In the detailed way to do stable handoff, we suggest the "Link Sharing Technique" to disconnection time of packet transmission for RSU to MIMG and the "Path Sharing Technique" to remove disconnection time of packet transmission for MIMG to RSU. we implemented the MIMG which performs the suggested handoff technique. We confirmed the superiority of our system by remove of the disconnection time(0 ms), and improved over 50 % of the communication bandwidth.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.1A
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• pp.33-43
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• 2010

Recently, users want to use real-time multimedia services, such as internet, VoIP, etc., using their IEEE 802.11 wireless lan mobile stations. In order to provide such services, a handoff among access points is essential to support the mobility of a node, in such an wide area. However, the legacy handoff methods of IEEE 802.11 technology are easy to lose connections. Also, the recognition of a disconnection and channel re-searching time make the major delay of the next AP to connect. In addition, because IEEE 802.11 decides the selection of an AP depending only on received signal strength, regardless of a node direction, position, etc., it cannot guarantee a stable bandwidth for communication. Therefore, in order to provide a real-time multimedia service, a node must reduce the disconnection time and needs an appropriate algorithm to support a sufficient communication bandwidth. In this paper, we suggest an algorithm which predicts a handoff point of a moving node by using GPS location information, and guarantees a high transmission bandwidth according to the signal strength and the distance. We implemented the suggested algorithm, and confirmed the superiority of our algorithm by reducing around 3.7ms of the layer-2 disconnection time, and guaranteed 24.8% of the communication bandwidth.

• The KIPS Transactions:PartD
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• v.11D no.4
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• pp.783-798
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• 2004

An e-business client application in ubiquitous mobile computing environment may become disconnected from the enterprise server due to broken communication connections caused by the limitation of mobile computing environments(limited battery life of the mobile device, low bandwidth communication, incomplete wireless communication infrastructure, etc). It Is even Possible that mobile client application Intentionally operates in disconnected mode to reduce communication cost and the power consumption of the mobile device. We use “data hoarding” as a means of providing local autonomy to allow transactions to be processed and committed on the mobile host despite of disconnection. The key problem to this approach is the synchronization problem that serialize potentially conflicting updates from disconnected clients on master objects of the server database. In this paper, we present a new transaction synchronizing method that splits a transaction into a set of independent component transactions and give the synchronization priority on each component taking the possibility of use and conflicts in the server into consideration. Synchronization is performed component by component based un synchronization priority. After the Preferred component of a no bile transaction succeeds in synchronization with the server, the mobile transaction can pre-commit at server. A pre-committed transaction's updated value is made visible at server before the final commit of the transaction. The synchronization of the component with low synchronization priority can be delayed in adaption to wireless bandwidth and computing resources. As a result, the availability of important data updated by mobile client is increased and it can maximize the utilization of the limited wireless bandwidth and computing resources.

• Journal of Popular Narrative
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• v.27 no.3
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• pp.151-191
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• 2021

This paper examines what is the content of Gusan's urban identity, represented by the film and how the contents and aspects of this city's identity interact with the structure of the films' discourse. weaves Gunsan and Seoul into continuously reorganized cities based on an interactive relation, rather than literal ones. Seoul in which the time for a film narrative is closed is converted into the starting point for tour to Gunsan. The both points in which audiences' ex post return occurs are the starting point for the time for the film discourse and the other point in which the title is suggested. The journey-type of the narrative structure in this film is a3-dimensional spiral-shaped, rather than a 2-dimensional circular regression. embodies the characteristics and the identity and apriority of two cities, based on such a spiral-shaped temporal and spatial structure. Seoul severs the relation between grand narrative/collective memory and small narrative/individual memory as an agnostic one, in other words, it is a city that cuts off cities, relations and memory and rejects the continuity of memory. On the other hand, Gunsan is a city in which both grand and small narrative and collective and individual memory coexist and both split and isolated mind are cured and mutually consoled. It describes Gunsan as the surplus space as a being for others, while expressing its identity as robust and literal thing. The film describes it as the field in which oppositional concepts such as historical interruption and continuity and spatial being for others and originality become 3-dimensional spiral ones, through the reciprocity between the narrative and the discourse structure. This paper has an implication, in that it examines how temporal and spatial relationship constituting the urban identity interacts with the structure of the film narrative.

• Industry Promotion Research
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• v.8 no.3
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• pp.95-109
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• 2023

The purpose of this paper is to empirically grasp the influence on self-efficacy and depression and the relationship between variables, focusing on middle-aged women in their 40s and 50s who are psychologically and socially vulnerable. Through this, it was intended to explore the psychological problems of highly educated careerinterrupted women from a personal perspective and further derive implications for the development of policies and services for socially highly educated career-interrupted women. The relationship between variables was analyzed through a survey based on measurement tools structured by variables of Saju factors, self-efficacy, and depression, and the effect of the sub-dimensional characteristics of Saju structure on self-efficacy, and the resulting level of depression were verified through structural equation model analysis. Bigeop, Jaeseong, and Kwanseong have been found to have a positive and direct effect on self-efficacy and negative direct effect on depression, eventually increasing self-efficacy and lowering depression. It was found that Siksang had a positive (+) relationship with depression and a negative (-) relationship with self-efficacy, but Inseong did not directly affect self-efficacy and depression. In addition, the indirect effects between variables and the effects between self-efficacy and depression were identified.

• Proceedings of the Costume Culture Conference
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• 2003.04a
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• pp.83-84
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• 2003

오늘날 한국 패션산업은 개화기 이후 우리의 복식 생활 자체가 서양화되면서 외국 문물의 무분별한 도입과 함께 단절되었던 전통성을 복원하여 현대의 시점에서 재창조 해야한다는 당위성을 안고 있다. 이에 현대에는 주체의식을 가지고 전통요소를 응용한 디자인 연구가 많이 시도되고 있으나, 현대 복식의 한 분야인 웨딩드레스에서는 이러한 시도가 이제 시작되는 단계로 연구가 미비한 실정이다. (중략)

• The Korean Publising Journal, Monthly
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• s.241
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• pp.10-10
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• 1998

단절된 민속문화를 찾아 되살려 놓은 데 반세기 삶을 고스란히 바친 심우성씨의 최근 저작에는 평생 민속문화의 '지킴이'가 되고자 했던 그의 신념이 담겨 있다. '심삿갓'이라 불리는 그의 별명대로 우리의 민속이 있는 곳이면 어디라도 달려가던 현장 연구가의 생생한 결실이 한권에 들어 있다.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2014.10a
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• pp.404-425
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• 2014

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2003.05a
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• pp.114-119
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• 2003

원자력발전소를 비롯한 위험 시설물의 확률론적 안전성 평가(Probabilistic Safety Assessment: PSA)는 고장수목(Fault Tree) 및 사건수목(Event Tree) 분석으로 이루어지며, 분석 결과로 그 시설물의 위험도(Risk)는 최소단절집합(Minimal Cutsets)들의 합으로 구성 된다.(중략)

• Restorative Dentistry and Endodontics
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• v.1 no.1
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• pp.39-42
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• 1975

A large granuloma was treated by apicoectomy and tampon change. The granuloma was developed at the apices of the right upper central incisor and lateral incisor. The patient was 29 year old female.