• The Journal of the Korea Contents Association
• /
• v.1 no.1
• /
• pp.109-117
• /
• 2001

The WAP gateway. for wireless internet applications services, is a software that is placed between the user terminals(PDA, mobile phones) and the WAP/Web server. H is a middleware system that converts the protocol of a packet network to the protocol on the WAP network, and supports the encoding of WML documents. In this paper, we designed and implemented the WAP gateway based on the WAP specification version 1.2 announced by the WAP forum. It provides cross-platform compatibility by being implemented by the Java language. Compared with a Kannel system using a Nokia tool kit version 1.2, it provides a more excellent performance and a stability.

• ETRI Journal
• /
• v.40 no.1
• /
• pp.72-88
• /
• 2018

In the fifth generation (5G) era, the radio internet protocol capacity is expected to reach 20 Gb/s per sector, and ultralarge content traffic will travel across a faster wireless/wireline access network and packet core network. Moreover, the massive and mission-critical Internet of Things is the main differentiator of 5G services. These types of real-time and large-bandwidth-consuming services require a radio latency of less than 1 ms and an end-to-end latency of less than a few milliseconds. By distributing 5G core nodes closer to cell sites, the backhaul traffic volume and latency can be significantly reduced by having mobile devices download content immediately from a closer content server. In this paper, we propose a novel solution based on software-defined network and network function virtualization technologies in order to achieve agile management of 5G core network functionalities with a proof-of-concept implementation targeted for the PyeongChang Winter Olympics and describe the results of interoperability testing experiences between two core networks.

• International Journal of Costume and Fashion
• /
• v.4
• /
• pp.1-20
• /
• 2004

Finland, the small Nordic country, far from anywhere, just happens to be one of the most modern and technologically advanced nations in the world. It is also the home of several leading global brands in their fields. Among these belong for example Nokia, Kone Elevators, and Metso Paper. This strange, cold country with its by reputation reserved and introvert Arctic people, manages to operate smoothly in the global village； in business, technology and also world politics. People from all over the world want go to Finland to study and work, knowing a lot about the clean, green, spacious country with extensive social security, equal women and general well-being.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2007.08b
• /
• pp.1749-1752
• /
• 2007

The Near to Eye Display (NED) solves the problem of having a display larger than a small portable device. The virtual image of the NED is created using a microdisplay and imaging optics. It is important that the optics does not interfere with the human visual system and that the device is light, compact and easy to wear. In this paper the principles of a biocular NED, which is based on a novel diffractive Exit Pupil Expander (EPE), are presented. The optical system is compact and intrinsically free from distortions and misalignments.

• Proceedings of the Korea Society of Costume Conference
• /
• 2003.10a
• /
• pp.16-17
• /
• 2003

Finland, the small Nordic country, far from anywhere, just happens to be one of the most modern and technologically advanced nations in the world. It is also the home of several leading global brands in their fields. Among these belong for example Nokia, Kone Elevators, and Metso Paper. This strange, cold country with its reserved and introvert Arctic people, manages to operate smoothly in the global village; in business, technology and also world politics. People from all over the world want go to Finland to study and work, knowing a lot about the clean, green, spacious country with extensive social security, equal women and general well-being. How can this be possible\ulcorner

• Proceedings of the Korea Information Processing Society Conference
• /
• 2000.10b
• /
• pp.1087-1090
• /
• 2000

현재의 이동통신망에서 인터넷 서비스를 제공할 수 있도록 하기 위하여 Phone.com 사에서는 HDTP(Handhold Device Transport Protocol)와 HDML(Handheld Device Markup Language)을 개발하고, Nokia 사에서는 TTML(Tagged Text Mark-up Language)를 개발하였다. 이에 따라 업체마다 각기 나름의 기술을 개발하게 되어 서로 호환되지 않는 문제가 발생했다. 이에 1997년 6월에 WAP 포럼이 결성되어, 현재 전세계 700여개 업체가 참여하고 있다. 본고에서는 WAP 포럼을 중심으로 한 기술개발 및 표준화 현황을 조사 분석하였다.

• Safety and Health at Work
• /
• v.10 no.3
• /
• pp.362-369
• /
• 2019

Background: Chronic nonspecific symptoms attributed to indoor nonindustrial work environments are common and may cause disability, but the medical nature of this disability is unclear. The aim was to medically characterize the disability manifested by chronic, recurrent symptoms and restrictions to work participation attributed to low-level indoor pollutants at workplace and whether the condition shares features with idiopathic environmental intolerance. Methods: We investigated 12 patients with indoor aire-related work disability. The examinations included somatic, psychological, and psychiatric evaluations as well as investigations of the autonomic nervous system, cortisol measurements, lung function, and allergy tests. We evaluated well-being, health, disability, insomnia, pain, anxiety, depression, and burnout via questionnaires. Results: The mean symptom history was 10.5 years; for disabling symptoms, 2.7 years. Eleven patients reported reactions triggered mainly by indoor molds, one by fragrances only. Ten reported sensitivity to odorous chemicals, and three, electric devices. Nearly all had co-occurrent somatic and psychiatric diagnoses and signs of pain, insomnia, burnout, and/or elevated sympathetic responses. Avoiding certain environments had led to restrictions in several life areas. On self-assessment scales, disability showed higher severity and anxiety showed lower severity than in physician assessments. Conclusion: No medical cause was found to explain the disability. Findings support that the condition is a form of idiopathic environmental intolerance and belongs to functional somatic syndromes. Instead of endless avoidance, rehabilitation approaches of functional somatic syndromes are applicable.

• Asian Journal of Innovation and Policy
• /
• v.5 no.1
• /
• pp.1-18
• /
• 2016

Catch-up is a well-known and familiar terminology for innovation scholars in developing countries such as Taiwan, Korea and China. The strategy, however, is too difficult to perform in each industry. This study looks into a catch-up strategy that Apple and Xiaomi used and examines the results on the creative imitation of business model in the smartphone industry. It is quite surprising that even Apple is based on catch-up strategy. They wanted to catch-up Nokia. Our case study shows that these two companies quickly caught up with the leaders, and the common feature of their strategy is characterized as creative imitation of business model. Creative imitation of business model is different from creative imitation of innovation. Furthermore, this research confirms that the creative imitation of business model leads to aggressive creative innovation.

• Journal of Communications and Networks
• /
• v.12 no.5
• /
• pp.442-448
• /
• 2010

Cooperative relaying methods have attracted a lot of interest in the past few years. A conventional cooperative relaying scheme has a source, a destination, and a single relay. This cooperative scheme can support one symbol transmission per time slot, and is caned full rate transmission. However, existing fun rate cooperative relay approaches provide asymmetrical gain for different transmitted symbols. In this paper, we propose a cooperative relaying scheme that is assisted with dual relays and provides full transmission rate with the same macro-diversity to each symbol. We also address equalization for the dual relay transmission system in addition to addressing the issues concerning the improvement of system performance in terms of optimal power allocations.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2008.10a
• /
• pp.1491-1494
• /
• 2008

Typically internal mobile LCD display modules are connected to the mobile product baseband PCB with flexible printed circuit board equipped with board-to-board connector. This solution has a drawback of limiting the product concept work to certain solutions that are based on connector size, location, flexible PCB length, bending, etc. in the display module. Also flexible printed circuit board based solutions are not completely optimized from reliability point of view, causing flex circuit board breakings. For the external displays in the PC or Home entertainment market, the cable solution is too expensive and resource demanding. The wireless solution has obvious advantages over reliability, low cost and flexibility. This paper describes a wireless audio-visual interface solution.