• Proceedings of the Korean Information Science Society Conference
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• 2002.10c
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• pp.724-726
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• 2002

개인이동기기의 사용이 증가함에 따라, 보다 효율적이고 편리한 이동시스템을 위한 많은 연구가 진행되고 있다. 특히 에너지 소모의 절감에 대한 연구는 이동기기의 기동성을 위해 중요한 문제이다. 동적전압조정은 이동기기의 에너지 소모를 가장 많이 차지하는 요소 중 하나인 프로세서의 전력을 효율적으로 관리하고 감소시킬 수 있는 방법이다. 본 논문에서는 MPEG 프레임별 복호시간의 차이를 이용한 동적전압조정 알고리듬을 통해 프로세서가 WPEG디코더를 실행할 때 전력소모를 최소화하는 과정을 프로세서 시뮬레이터를 통해 확인한다. 논문에서 제안한 동적전압조정 알고리듬은 원래의 프로세서 에너지 소모와 비교하여 약 70%-85%의 감소효과를 볼 수 있었다.

• TTA Journal
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• s.72
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• pp.27-39
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• 2000

이동통신가입자의 급격한 증가와 인터넷의 보급증가는 이동 인터넷이라는 새로운 패러다임의 등장을 가져왔고 이런 응용들은 기존의 이동통신시스템에서 제공되기에는 많은 제약이 발생하여 여러 국가에서 제3세대 이동통신 시스템인 IMT-2000시스템의 상용화를 추진하고 있다. 국내에서도 이에 대한 연구, 개발이 많이 진행되어 관련표준에 국내기술이 반영되고 주요 특허 확보가 이루어지고 있다. 본 고에서는 이렇듯 중요한 표준 기술의 현황을 알아보기 위하여 IMT-2000 네트워크 관련 주요 요소기술들을 살펴보고 이에 대한 지적재산권 현황을 분석하도록 한다.

• Journal of the Korea Society for Simulation
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• v.22 no.4
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• pp.119-128
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• 2013

We need to consider a number of technical constraints to build new warehouses. In particular, it is essential to assure that the flow of trucks is smooth and seamless even in large size warehouses. The flow of trucks in warehouses are subject to, for instance, the routes of trucks, the frequency and the time stamps of their in-and-out's. Also, the routes of trucks interfere each other. Thus, finding good flow of trucks in a warehouse is a tough task when all interferences among trucks are considered. In this paper, we find some layouts of the routes of trucks exhibiting good performance based on simulation. we use ARENA ver. 11 for simulation.

• Archives of design research
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• no.18
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• pp.123-134
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• 1996

For handicapped person who have a handicap in moving, vehicles are indispensible, especially in the viewpoint of handicapped person's participation for social life by rehabilitation, the freedom of movement equaling to nonnal person is a important factor for improving the quality in being complete growth.In the purposese of positively social participation of handicapped person, this study investigated the general problems about using a means of transportation in the users of wheelchair and for solving these problems and approached, in the viewpoint of styling, vehicles were considered from character of self-supporting in getting on and off a car. For that first, this study was progressed by suggesting invigorating convenience facilities in already established vehicles for the user of a wheelchair and the part of moulding of modified vehicles in a structure. Moreover, making a selection of domestic vehicles arbitrarily, analyzing a internal structure of a boarding of a wheelchair, and suggesting the modified model of vehicles by the sketch.

• Proceedings of the Korea Information Processing Society Conference
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• 2000.10b
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• pp.1113-1116
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• 2000

기존의 연구에서는 셀룰러 망에서 호 수락 제어 시에 다음 두 가지 요소를 고려하지 않는다. 첫 번째 요소는 각각의 셀, 특히 micro/pio 셀에서 서비스 제공이다. micro/pico 셀과 같이 심한 트래픽 변동이 있는 셀에서는 호 단절률이 수렴할 수 없기 때문에 이동 QoS와 서비스 제공이 불가능하다. 두 번째 요소는 망에서 호를 수용할 수 있는 능력과 관련 있는 GOS 이다. 일반적으로 여러 비율의 서비스는 서비스의 집합으로 특정지을 수 있고, 각각의 것들은 다른 양의 대여폭을 요구한다. 이질적인 멀티미디어 서비스 클래스를 가진 망에서는 소수의 광대역호가 망 자원의 대부분을 점유해서, 신규호에 대한 봉쇄로 망 성능을 떨어뜨릴 수 있다 그래서, GoS는 광대역호 제어에 의해서 향상될 수 있다. 본 논문에서는 이동 트래픽 조건에서 서비스 제공이 가능한 셀들의 최소 집합이면서 논리적인 단위인 지역이라고 불리는 새로운 개념을 소개한다. 그리고 서비스 제공 단위가 셀보다는 지역단위로 한 경우에 성능이 더 좋고 GoS 를 향상시킬 수 있는 방법인 지역기반 CAC 를 제한한다. 마지막으로 시뮬레이션에서는 QoS와 GoS 관점에서 RCAC가 현재까지 제안된 다른 방법보다 더 좋은 성능을 제공한다는 것을 보여준다.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.8 no.1
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• pp.103-113
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• 1996

Two-dimensional finite element hydrodynamic models for long wave simulation usually adopt fixed land boundary. However moving boundary treatment is strongly required in the simulation of tidal flats for west and south coast of Korea. In this study very efficient and realistic moving boundary treatment is applied by considering incident long wave surface slope. Developed STEP-CM (Superior Two-step Explicit Program for Coastal Modeling) ,shows numerically stable results in comparative study for idealized one-dimensional channel. Real application of the model is done for Chonsu Bay where tidal flats are distributed along the coast. Nonlinear tidal current and tidal flat effects are easily simulated in STEP-CM and resulting circulations are detected around headland of Wonsan Island.

• Korean Business Review
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• v.17 no.2
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• pp.203-228
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• 2004

This dissertation investigated the evaluation model of IT Service quality: concentrated on the quality components in mobile communication service. Today, mobile communication service is changing dramatically. The first and second generation's mobile communication services were designed for voice and SMS(Short Message Service). However, while the mobile communication industry grows, the mobile technology made more services available for customers. Customers' changing needs brought a new opportunities to the market. Now, mobile communication service is facing a new era as multi-functioning, multimedia service, and high speed data transfer service are being introduced. There has been a lot of theoretical literature on service quality components of mobile communication, but most of the literature was focused on the voice service and SMS(1st and 2nd generation). As mobile communication service evolves, the components may have to be altered or rebuilt. To identify which service quality components ought to be utilized, prior studies on service quality components, service quality, and customer satisfaction were reviewed. Also, a survey was conducted on the various aspects of mobile communication service. This study suggests 6 components of service quality: those are supporting facilities, cellular phone(facilitating goods), quality of the voice service(explicit service), supplementary services, supporting services, and cost. Empirical results supported that all of these components are proven as the service quality components, but, with regards to customer satisfaction, only cellular phone(facilitating goods) and supplementary services are effective. As previously stated, the relationship between service quality and customer satisfaction is also proven. This study is a point of departure for the success of upcoming generation's mobile communication service. It identifies what is valuable from the customer's point of view. Furthermore, it suggests some ideas to prepare for future market opportunities.

• Archives of design research
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• v.14 no.4
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• pp.189-198
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• 2001

This study was to identify HCl design factors for increasing information processing and attention for mentally retarded children. Several factors such as size, location, moving distance were varied for three experiments operated by the amount of information. The results showed that the larger size of target, the greater moving distance of target, and the less amount of information increased mentally retarded children's sensitivity. Also, when the target was displayed at upper left of computer screen, sensitivity of mentally retarded children was high, compared other locations of screen.

• Journal of the Korea Organic Resources Recycling Association
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• v.10 no.3
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• pp.92-97
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• 2002

This study is to analyze collection factor of food wastes using GIS. For calculation of collection crews and equipment, It was measured velocity(43m/min), moving coefficient(1.9), moving distance(17,200/day), collection rate(0.313kg/day) on the basis of S2Dong. Moving coefficient was able to analyze straight distance of S2Dong using GIS and other areas were also applied to analyze straight distance of each area using same method. At N autonomous district, 10 persons of collection crews were necessary, but collection of food wastes by four forces resulted to be 11 persons of crews necessary. 7 vehicles were necessary, but 8 vehicles were needed by same reason.

• Information Systems Review
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• v.5 no.2
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• pp.37-51
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• 2003

Mobile business noticed as a constructive alternative of e-commerce and e-business is being diversely considered as a new form or subset of e-business. In this study, mobile business is defined as a comprehensive alternative including e-business. The framework of the superset of e-business has two axes: connectivity and mobility. In addition, various cases based on the combination of the components are provided and explained. It is the main characteristic of this study that the element of off-line "mobility" is added to "connectivity" generally used while explaining e-commerce and e-business. For place (or location) is a prerequisite for the feature of mobility, we grope for why and how Location-Based Service (LBS) will take an important role in the development of new e-business models and services. As the real and full-scale beginning of IMT-2000 service and the rapid progress and diffusion of mobile communications services including wireless LAN require an immense and innovative way of thinking about e-commerce and e-business, the framework suggested in this study is considered to go far toward satisfying the new needs in this area.