• Journal of Positioning, Navigation, and Timing
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• 제13권1호
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• pp.63-73
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• 2024

NeQuick G is the ionosphere model utilized by Galileo single-frequency users to estimate the ionospheric delay on each user-satellite link. The model is characterized by the effective ionization level (Az) index, determined by a modified dip latitude (MODIP) and broadcast coefficients derived from daily global space weather observations. However, globally fitted Az coefficients may not accurately represent ionosphere within local area. This study introduces a method for regional ionospheric modeling that searches for locally optimized Az coefficients. This approach involves fitting TEC output from NeQuick G to TEC data collected from GNSS stations around Korea under various ionospheric conditions including different seasons and both low and high solar activity phases. The optimized Az coefficients enable calculation of the Az index at any position within a region of interest, accounting for the spatial variability of the Az index in a polynomial function of MODIP. The results reveal reduced TEC estimation errors, particularly during high solar activity, with a maximum reduction in the RMS error by 85.95%. This indicates that the proposed method for NeQuick G can effectively model various ionospheric conditions in local areas, offering potential applications in GNSS performance analyses for local areas by generating various ionospheric scenarios.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 II
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• pp.1153-1156
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• 2003

In this paper, we present a reducing power consumption of a scheduling for module selection under the time constraint. Traditional high-level synthesis do not allow reuse of complex, realistic datapath component during the task of scheduling. On the other hand, the proposed scheduling of reducing power consumption is able to approach a productivity of the design the low power to reuse which given a library of user-defined datapath component and to share of resource sharing on the switching activity in a shared resource. Also, we are obtainable the optimal the scheduling result in experimental results of our approach various HLS benchmark environment using chaining and multi-cycling in the scheduling techniques..

• 한국환경과학회지
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• 제14권5호
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• pp.457-461
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• 2005

The survey of user's satisfactory degree of location, plantings, facilities, operation, and management factors on national parks' camp sites was carried out. Many problems were analyzed and identified. This survey was for proposing the correct way to plan and draft for camping site after this. In addition to, the realization of environmental education through nature friendly recreation was aimed at. According to the result of the survey, the followings were suggested as necessities to improve the camp site. 1. Repair and replacement of insufficiently managed facilities should be aimed at. 2. Facilities for a handicapped person should be preferentially introduced. 3. Active management and publicity in low-demand season that practiced by developed countries should be carried out. Seasonal program for various age groups should be operated. 4. Surrounding tourist site, camp site, and trail should be organically connected by shuttle bus and other transports. A survey was carried out for the user satisfaction in the campsites of national parks. Based on this survey concerned with the location, planting, facilities, operation and management, the problems were identified and analysed to improve future design and plan of the campsites. This study aims for the realization of environmental education through nature friendly recreation. The following points are suggested as needed according to the survey result. 1. damaged facilities should be repaired or replaced. 2. introduction of the facilities for disabled should be prioritized. 3. consistent and active management and publicity work should be operated in the off-peak season. and the seasonal activity programs for the various age groups should be provided. 4. the site should be well connected with other surrounding campsites and tourist sites using the shuttle bus and other transport method.

• 한국멀티미디어학회논문지
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• 제10권5호
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• pp.623-630
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• 2007

IT 기술의 발전으로 사용자 편의성 요구에 따라 빠른 속도로 유비쿼터스(Ubiquitous) 환경이 조성되고 있다. 유비쿼터스 환경에서는 서비스 제공을 위한 개개인 식별이 중요하기 때문에 RFID(Radio Frequency IDentification) 기술을 핵심적으로 사용하고 있다. RFID란 무선 주파수 인식 기술로 리더의 신호에 의하여 태그가 저장하고 있는 정보를 제공하여 사용자를 식별할 수 있는 기술이다. 높은 인식률과 빠른 인식 속도 등 많은 장점을 가지고 있지만 무선 통신으로 인하여 불법적인 사용자로부터의 도청이 가능하며, 리더의 신호에 의하여 태그가 쉽게 동작하기 때문에 사용자 정보 노출에 대한 문제가 발생하고 있다. 이를 해결하기 위하여 많은 연구가 진행되고 있지만 저가의 수동형 태그에 적용할 수 있는 보안에는 한계가 있기 때문에 일반적으로 해쉬 함수 및 난수를 이용하며, 한 세션에 사용된 값들을 갱신하여 다음 세션에 사용함으로써 보안을 제공하고 있다. 따라서 본 방식은 난수를 이용하여 사용자 프라이버시를 보호하고 값을 갱신하지 않고 가변적인 값을 생성함으로써 동기화를 제공할 수 있도록 하였다.

• 한국정보통신학회논문지
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• 제25권2호
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• pp.208-213
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• 2021

컴퓨터 활용을 통한 문화도 기존의 문화 형태를 변화시킬 만큼 다양하고 빠르게 변화되고 있다. 앉아서 생활하는 시간이 증가하면서 인간은 요통의 질병에 더 많이 노출 되었으며, 요통은 허리디스크를 중심으로 허리와 관련된 통증을 포함한다. 요통의 대부분은 척추와 몸통을 지지해주는 근육과 인대 이상에 따른 원인이 크다. 이에 허리 요통을 포함한 건강한 허리를 유지하기 위한 효과적인 대책이 필요하다. 본 논문에서는 요통을 감소하거나 치료에 도움을 줄 수 있도록 요추 운동효과를 얻을 수 있는 앱 개발을 위한 전반적인 설계를 제시한다. 이를 효과적으로 사용하기 위해서 요추 운동효과를 얻기 위한 방안을 제시하고, 이를 그래픽기반 유도점을 활용하여 효과적인 요통 치료에 도움일 될 수 있는 앱 설계 제시를 목표로 한다.

• 한국의료질향상학회지
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• 제12권1호
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• pp.104-112
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• 2006

Background : The necessity of unify and standardize codes used at hospital has been emphasized since OCS (Order Communicating System) was adopted. Therefore, the purpose of this study were to standardize operation code by continuous training of the ICD-9-CM code that is used as standard code in OCS program at operating room. Method : In 400 operation data, operation code entered in OCS program at operating room was compared to operation name recorded in medical record. In addition, a matching rate between input data of operation code by medical record department and computing input data of operation code in 3,710 cases was compared for each department. User operation name and operation code were matched and major diagnosis by operation department and operation name were also matched. Results : User operation name was reflected in operation classification code in detail, and operation code entered on user was registered. Input rate and matching rate of operation code were gradually improved after improvement activity. In particular, a matching rate was high at ophthalmology where operation name is segmented. Plastic surgery and orthopedics with a lot of emergency operation and comprehensive operation name show low input rates. Conclusions : As the medical field makes progress in computerlization, awareness of information exchange and sharing becomes higher. Among codes to classified medical institution, codes related to surgical operation are all different by user of hospital and department. Computerlization and standardization is essential. And when efforts of standardization continue in alliance with individual hospital and institution, initiative of preparing medical policy data at a national level will be accelerated.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2008년도 학술대회 1부
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• pp.141-146
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• 2008

최근 유비쿼터스 환경에서의 다양한 서비스에 대한 연구가 활발히 진행되고 있다. 이러한 서비스들은 사용자의 컨텍스트를 해석하는 것이 중요하며, 이를 위해 PDA, GPS, 가속도 센서 등 다양한 센서들이 활용되고 있다. 가속도 센서와 같은 저급의 연속적인 데이터를 수집하는 센서는 그 데이터를 직접 활용하는 것이 어려우므로 전처리 하는 것이 중요하다. 하지만 실시간으로 전처리하고 컨텍스트를 통합하는 시스템에 대한 연구가 미흡하다. 본 논문에서는 XMI 을 활용하여 가속도 센서와 생리적 신호 센서 등과 같은 저급의 데이터를 전처리하고 컨텍스트를 통합하는 시스템을 제안한다. XML을 통하여 센서 네트워크의 구조를 정의하고, 각 센서별로 수집되는 데이터와 데이터에 해당하는 컨텍스트의 룰을 정의할 수 있다. 제안하는 시스템은 XML을 통하여 센서 네트워크에 센서를 추가할 때와 컨텍스트의 룰을 수정할 때 소스의 수정을 줄여준다. 그리고 이 시스템을 활용하여 실시간으로 데이터를 모니터링하는 시스템을 구현하여 난해한 데이터의 변화를 그래프로 표현해 데이터의 검증을 도와주며, 실시간으로 전처리의 결과를 확인하여 변화가 가능하고, 다른 외부 서비스나 어플리케이션에 사용자의 컨텍스트의 제공을 용이하게 해준다.

• 인간식물환경학회지
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• 제24권2호
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• pp.229-244
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• 2021

Background and objective: The purpose of this study was to comprehensively analyze the user behavior in order to cope appropriately with the increasing demand for mountain usage of those in their 20s and 30s and to allocate resources efficiently. Methods: To analyze the behavior of mountain hiking users, an exploratory data analysis (EDA) was conducted on the data which had been collected in the app Tranggle. The main target are users in their 20s and 30s who visited the mountains in the metropolitan area in 2019-2020. Among them, we have selected data on the top 13 mountains based on the frequency of visits. After data pre-processing, mountain usage patterns were analyzed through statistical analysis and visualization. Results: Compared to 2019, the number of users in 2020 increased 1.36 times. The utilization rate of the well-established hiking trails has also increased. The usage of mountain on weekends (Saturday > Sunday) was still the highest, and the difference in the usage between the days of the week decreased. Outside of work hours, early morning usage has increased and night-time usage has decreased. There was no significant change in usages depending on activity type, level (experience point) and exercise properties. Conclusion: Since the COVID-19 outbreak, the usage of mountains has been changing towards low user density and short-distance trip. in the post-COVID-19 era, the function and role of forests in daily life are expected to increase. To cope with this, further research needs to be carried out with consideration of the wider demographic and social characteristics.

• 정보처리학회논문지D
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• 제13D권4호
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• pp.557-564
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• 2006

정보는 효과적으로 활용되어 이윤 창출에 기여하고, 신속하고 올바른 경영 판단을 지원하며, 재사용이 가능해야 하는 중요한 자원이다. 최근의 정보 시스템들은 사용자들의 다양한 요구를 반영하여 기업의 경쟁력을 높이고, 급변하는 환경 변화에 적응하기 위해 점차 대형화, 복잡화 되고 있으며 정보 품질의 중요성도 점차 강조 되고 있는 추세이다. 사용자들이 원하는 정보 제공에 있어 가장 큰 문제점은 저 품질의 데이터를 기반으로 하는 낮은 품질의 정보 제공에 있다. 낮은 정보 품질에 의해 기업 경영이 이루어질 경우 기업의 전략 수립, 전략 수행, 고객과 경쟁 기업에 대한 경영 집중력 분산 등 기업의 경영에 있어 경쟁력이 떨어 질 수밖에 없다. 낮은 품질의 정보는 부정확한 데이터를 개선하거나 조정하기 위한 시간 및 비용을 증가 시키고, 특정 현황에 대한 정확한 정보를 제공 받기가 어려워진다. 이러한 문제점들을 해결하기 위해서는 데이터에 대한 명확한 이해, 데이터 관리 체계 확립, 그리고 체계적인 데이터 관리 수행 등을 통하여 고품질의 데이터를 획득 할 수 있게 해야 한다. 현재까지 정보 품질과 관련된 연구 및 방법론은 부분적으로 진전이 있으나, 정보 품질 관리 전반에 대한 체계적인 방법론은 존재하지 않는 실정이다. 따라서 본 논문에서는 정보 품질 관리를 위한 프로세스들을 도출하고 정보 품질과 관련된 평가 요소를 도출하여 이를 정보 품질 보증 프로세스 단계인 CMM(Capacity Maturity Mode]) 5단계를 참조하여 제시한다. 본 논문은 정보 품질 개선 관리 프로세스 정립을 통해 기업의 정보 품질 관련 전략을 수립 하고, 경쟁력 있는 기업 또는 조직 활동에 이바지 하며, 품질 좋은 정보 활용에 따른 경쟁력 있는 운영에 이바지 하고자한다.

• 대한인간공학회지
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• 제36권4호
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• pp.281-292
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• 2017

Objective: This study aims to identify important physical design variables in designing a necklace type wearable device, and to present design guidelines to maximize comfort that a user feels upon wearing the device. Background: Interests in fitness culture and personal health are on the rise recently. In such a situation, demand for necklace type wearable devices is projected to increase a lot, as the devices enable users to use their hands freely and to enjoy various contents through connection with mobile devices. However, the necklace type wearable device's comfort was assessed to have the lowest comfort in a running situation, where human body moves up and down and left and right more than other devices wearable on other human body parts. Therefore, the usability of a necklace type wearable device was low. In this regard, studies on identification of the variables affecting user comfort upon wearing a necklace type wearable device and on physical design direction maximizing comfort and usability are needed. Method: A pretest and a main test were carried out to draw the direction of necklace type wearable device design. In the pretest, wearing evaluation on the diverse types of devices released in the market was conducted to draw physical design variables of the devices affecting comfort. Furthermore, variables significantly affecting the comfort of a device were selected through an analysis of variance (ANOVA). In the main test, anthropometry was performed, and information on anthropometric items corresponding to the design variables selected in the pretest was acquired. Based on the pretest results and the anthropometric information in the main test, the present study produced design guidelines maximizing the comfort of a necklace type wearable device with regard to major design variables upon dynamic tasks. Results: According to the pretest results, the variables having effects on comfort were the angle of side points, width, and height. Due to interactions between variables, those need to be simultaneously considered upon designing a device. Upon dynamic tasks, the angle of side points and width of a device was designed to be smaller than mean angle of the trapezius muscle and neck width, and thus attachment to human body was high. As height was designed to be larger than mean neck front and rear point width, comfort was higher due to feeling of stability. Conclusion: Because user sensitivity to comfort was high at human body's inflection points, a device needs to be designed for users not to feel high pressure on specific body parts with the device fitting human body shape well. A design considering user's situation is also required in further studies.