• Journal of Korea Water Resources Association
• /
• v.48 no.5
• /
• pp.357-365
• /
• 2015

Both exponents of distance and elevation into distance-and-elevation ratio method for estimating missing rainfall data are expressed as squares together but in this study the two exponents are differently separated and analyzed. We used 326 hourly rainfall events of precipitation data during 10 years of 2004 to 2013 observed at a base station of Pyeongchang and the five neighboring index stations-Bangrim, Suju, Cheongoksan, Jinbu, Yeongwol1-in Han River basin for a case study. As a result, exponent values of distance and elevation appropriate for a topography of the site appear as 3.7 and 0.57 respectively. The exponents of distance and elevation difference need to be applied according to topographical characteristics of site where estimating missing data or interpolation are required.

• Proceedings of the IEEK Conference
• /
• 1998.10a
• /
• pp.163-166
• /
• 1998

Toen 방식을 사용하는 거리 측정시스템의 잡음 및 간섭에 대한 열화 도를 분석한다. 위성 링크상의 잡음 및 다중 변조 방식에 의한 전송 신호간 간섭들로 인하여 위상차 측정에 열호가 발생하며, 열화 도는 ranging 측정 시스템의 잡음 대역폭에 의존한다. Ranging 측정 모드에서는 잡음 대역폭 8Hz, 4Hz 그리고 1Hz에 대하여 0.3dB 열화가 방샐하였으며, ranging 및 원격 측정 데이터 전송 모드에서는 대역폭에 따라 6.4dB, 4.2dB, 4dB가 발생하였다.

• Defense and Technology
• /
• no.4 s.254
• /
• pp.54-65
• /
• 2000

셀룰라망을 이용한 위치보고체계는 전파통달거리를 고려한 셀 단위로 구축하였기 때문에 지휘망을 이용하는 방안에 비해 신뢰성 있는 보고를 기대할 수 있으며, 동일한 정보를 1, 2차 상급부대에 중복 보고할 필요가 없고, 일정거리 이상의 다른 셀에서 같은 대역의 주파수를 사용해도 무방하므로 주파수 재사용의 효과도 거둘 수 있다. 아울러 인터넷과 데이터 베이스 관리 시스템을 소프트웨어로 효과적으로 연동시킴으로써 현재 상용에서 각광 받고 있는 Web-Server 개념을 군 무선 데이터 통신에 도입하고 하드웨어도 대용량의 지능망으로 발전한다면 위치보고 뿐만 아니라 늘어나는 정보를 효과적으로 처리하기에 충분하리라 판단된다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2002.11a
• /
• pp.628-631
• /
• 2002

차세대 유무선 통신망은 IP기반으로 통합 발전될 것이라고 기대하고 있고, 현재 연구중인 Mobile IP는 필수적으로 사용하게 될 것이다. 문제점이 많은 기본 Mobile IP에 기존의 하위계층에서 사용하던 여러 가지 기술들을 추가하려고 노력하고 있는데, 그 중 대표적인 것이 위치등록과 페이징 기법이라고 할 수 있다. 본 논문은 3계층에서의 이동성 프로토콜인 Mobile IP에 기존의 2계층에서의 거리기반 위치등록 방법을 적용시켜 IP망에서의 효율적인 페이징 방안을 제시한다. 그리고, 네트워크 시뮬레이션 도구인 OPNET을 이용하여 제시한 방안을 구현하고 검증하였다.

• Journal of Advanced Navigation Technology
• /
• v.23 no.1
• /
• pp.36-43
• /
• 2019

In this paper, a novel channel access scheme for the next-generation vehicle to anything (V2X) system based on IEEE 802.11p standard which is applied to recent connected car technologies is suggested and analyzed. The proposed scheme proposes a channel access method utilizing OFDMA multi-user transmission for IEEE 802.11p based system. In this paper, the authors examine geographical distance and network area performance of IEEE 802.11p system and the proposed scheme. Results of this research show that the proposed scheme is quite suitable for improving conventional V2X standards and systems. This paper also provides mathematical analysis and simulation results of the conventional IEEE 802.11p system and the proposed scheme.

• Journal of Korean Electronics
• /
• v.25 no.6
• /
• pp.8-11
• /
• 2005

미래의 IT시장을 주도하기 위해 "제2차 IT 전쟁"이 본격화 되고 있다. 새로운 먹 거리 창출의 지름길로 부상하고 있는 한국 이동 멀티미디어 산업의 현재와 미래를 DMB 중심으로 조명해 본다.

• The Journal of Korean Orthopaedic Ultrasound Society
• /
• v.7 no.1
• /
• pp.20-27
• /
• 2014

Purpose: The purpose of this study was to evaluate coracohumeral distance (CHD) in patients with or without subcoracoid impingement with hypothesis that patients with subcoracoid impingement would have narrower CHD. Materials and Methods: One hundred twenty-four patients with subacromial impingement were evaluated. The subjects with subcoracoid impingement which was affirmed clinically and confirmed by ultrasound guided subcoracoid injection (n=28) was compared with patients with subacromial impingement only (n=96). Patients with stiffness and rotator cuff tear were excluded. Absolute CHD was measured on magnetic resonance imaging (MRI) axial images and on ultrasound with the humerus in neutral position and internal rotation. Also relative ratio of distance difference (RRDD) defined as the difference of CHD in neutral position and internal rotation compared with absolute CHD in neutral on ultrasound was also measured. Results: The distance measured in neutral position was similar between US imaging and MRI (p>0.05) and both measurements did not have significant difference between the two groups (p>0.05). On ultrasound, the difference in CHD in internal rotation between the two groups nearly met the level of significance (p=0.07). No significant difference of CHD difference in two humeral positions was seen between the two groups. However, RRDD value was significantly greater in subcoracoid impingement group (p<0.05). Conclusion: No significant difference of CHD was seen between the subcoracoid impingement group and the control group. RRDD value was greater in subcoracoid impingement group suggesting that individualized coracohumeral distance in internal rotation should be taken into account when assessing patients with subcoracoid impingement.

• Smart Media Journal
• /
• v.12 no.9
• /
• pp.72-80
• /
• 2023

This paper presents a design and analyzes the performance of a hospital assignment and reassignment scheme for emergency rescue services based on minimum cost maximum flow algorithm. It consists of flow graph building, link capacity updating, and allocation discovering steps. The efficiency of the algorithm makes it possible to reallocate hospitals even in case of dynamic changes in the number of patients or hospitals. The performance measurement result obtained from a prototype implementation shows that the proposed scheme can reduce the transport time requirement miss by up to 24%.

• Science of Emotion and Sensibility
• /
• v.12 no.4
• /
• pp.411-424
• /
• 2009

Morality is one of the references when people judge the world. In two studies we addressed the impact of social distance and mood on moral judgment. Participants judged the people who kill one person to save the many by moral and action appropriateness. In study 1 Social distance was induced in best friends and strangers condition. We hypothesized that judgments rely on deontology depends on social distance. Study 1 showed that same actions in moral dilemmas are judged more severely when the people are more socially distant(strangers). But this effect of social distant was found only judgment of moral appropriateness. Study 2 examined how mood can affect moral judgment. There have been many work investigated the role of mood in determining the kind of cognitive processing. Results from study 2 showed participants in positive mood condition are judged more severely. This difference between positive and negative mood was found only judgment of action appropriateness in contrast with study 1. These results suggested that moral judgment can be affected by social distance and mood. We also found that these factors have selected impact on moral and action appropriateness.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.28 no.3
• /
• pp.329-336
• /
• 2010

This study deals with the measurement of reflectivity as well as the distance accuracy with Terrestrial Laser Scanner(TLS) using time of flight methods and near infrared wave length, for a variety of user-made targets. Especially, point clouds' reflection to several targets was measured with Gretag Macbeth il spectrophotometer in the office. And the distance accuracy in comparison to reference distance for TLS performance evaluation, was tested after scanning the user-made targets and measuring the inter-pillars distances over the precise EDM calibration baseline. The results of test was shown that except white resin objects, with approx. 10m and 170m inter-pillar distances, other targets achieved the distance accuracy of several millimeters(mm) with respect to standard distances. Future work should be concentrate on a few parameters influencing on the distance accuracy such as atmospheric correction, instrument correction, the additive constant or zero/index correction, etc.