• Journal of Internet Computing and Services
• /
• v.8 no.5
• /
• pp.117-123
• /
• 2007

Catadioptric mirrors are widely used in automatic surveillance system. The major drawback of catadioptric mirror is its unequal image resolution. Equidistance catadioptric mirrir can be the solution to this problem. The exact axial alignment and the exact mount of mirror are the sources that can be avoided but the focal length variation is inevitable. In this paper, the effects of focal length variation on the computation of depth and height of object' point are explained and the effective and simple focal length finding algorithm is presented. First two object's points are selected, and the counterparts on the other stereo image are to be found using MSE criterion. Using four pixel distance from the image center, the assumed focal length is calculated. If the obtained focal length is different from the exact focal length, 24mm, the focal length value is modified by the proposed method. The method is very simple and gives the comparable results with the earlier sophisticated method.

• Maritime Security
• /
• v.6 no.1
• /
• pp.137-161
• /
• 2023

This paper explores the limited role of alliances in preventing maritime territorial disputes among member states, using the ongoing conflict between Greece and Türkiye, two NATO allies, as a case study. Drawing on Institutionalist theory, we seek to explain the mechanisms that have contributed to the failure of the alliance to prevent this dispute, despite constant cooperation and transparency. Unlike land disputes, maritime territorial disputes are complex and multi-layered, with fluid boundaries that can change with climate or natural resource availability. Moreover, the lack of constant surveillance creates ambiguity about territorial encroachment thresholds. These factors have exacerbated the dispute between Greece and Türkiye, drawing other NATO members into the conflict and undermining the strength of the alliance. This paper concludes by providing policy implications for the Republic of Korea in its own potential maritime disputes, and contributes to the broader literature on the role of alliances in preventing territorial disputes.

• 한국정책학회보
• /
• v.21 no.2
• /
• pp.1-31
• /
• 2012

본 연구는 정책학의 학문적 정체성을 정의·분류하고, 학문적 정체성의 하위차원에서 도출된 연구 질문과 기존 연구에서 제기된 논쟁점에 대해 학문공동체와 기존 연구들이 어떻게 논의하고 있는지를 정리하였다. 이러한 논의를 통하여 정책학의 정체성이 무엇이고 어떤 상태에 있는지, 연구 노력과 활동이 정체성 정립에 기여했는지, 학문적 정체성 구축을 위한 연구 함의는 무엇인지를 파악하고자 한다. 본 연구의 학문적 정체성은 '독자적이고 고유한 이론체계와 방법론 및 연구 대상과 범위를 가지고 있으면서(과학적 정체성) 경계에 따라 차이가 있고 구별되는 독특한 특징을 고민하면서(경계정체성) 공동체를 구성하여 학문의 영역과 미래를 회고·전망하는 것(집단정체성)'으로 규정하였다. 즉 정책학의 학문적 정체성은 세 가지 하위 차원과 각각의 구성요소(패러다임, 한국화, 공동체 활동 등)로 이루어져 있다. 정책학의 학문적 정체성을 종합적으로 판단하면 다음과 같다. 정책의 개념 정립과 이론 구축 등의 멀고 성가신 길을 회피하는 경향이 있는 것으로 판단하여 과학적 정체성 수준은 매우 낮고 그 구축은 요원하다고 하겠다. 빈약한 또는 잘못된 정책 개념을 극복하고 정당한 과정을 거친 개념 규정이 우선적으로 필요할 것이다. 정책학의 한국화에 대한 연구 요청 대(對) 무용론이나 연구 축적은 거의 없다는 비판 등이 대치하고 있는 것으로 판단하여 경계 정체성에 대한 위기를 인식하고 있지만 지속적인 관심과 연구 축적이 필요하다고 하겠다. 학문공동체를 구성하여 (한국)정책학의 위치와 미래에 대해 회고·전망의 장을 열고 있지만 공동체의 목적인 근본적 문제 등에 관한 자극은 부족한 것으로 판단하였다. 구성원들의 응집력은 한국화 등에 대한 공동 노력이 시도되고 있는 반면, 개념 구성 등에 대한 그것은 알려진 것이 드물다. 따라서 집단정체성은 과학적 정체성의 공유(자극, 공동노력, 응집력)는 상대적으로 부족하고 경계정체성의 공유는 시도 단계에 있다고 볼 수 있다. 개념 정립, 이론 구축 등과 같은 과학적 정체성에 대한 연구는 위험이 따르기 때문에 개인적 시도보다는 학문공동체의 관심과 자극이 수반된 공동 노력으로 연구될 필요가 있다고 하겠다.

• Journal of Biomedical Engineering Research
• /
• v.21 no.2
• /
• pp.145-156
• /
• 2000

본 논문에서는 중앙시상 두뇌 자기공명영상 분할결과를 이용한 3차원 시상 두뇌 자기공명영상의 자동분할기법을 제안한다. 제안된 알고리즘에서는 먼저 3차원 시상 두뇌 자기공명영상의 중앙영상을 분할하고, 분할된 중앙두뇌 자기공명영상을 인접하는 영상에 마스크로 적용한다. 이 때 마스크 적용으로 인하여 인접하는 영상이 절단되는 문제가 발생할 수 있다. 이러한 문제를 해결하기 위하여 절단 영역의 경계점을 검출한 후, 절단 영역에 대한 경로 재설정을 통해 절단 영역을 복원한다. 이러한 경로 재설정을 위해 connectivity-based threshold segmentation algorithm을 사용하였다. 실험결과 제안된 알고리즘의 유용성을 확인할 수 있었다.

• Journal of Korean Society for Geospatial Information Science
• /
• v.17 no.1
• /
• pp.37-42
• /
• 2009

The accuracy of RTK GPS is limited by the distance dependent errors from orbit, ionosphere and troposphere, as the distance between the rover and the base station increases in the Real Time Kinematic surveying. To solve this problem, VRS system has installed. This study would estimated the accuracy of cadastral detail surveying, which is used on the VRS RTK instead of Total Station and RTK GPS demand for various equipments and time. As a result of study, the positioning accuracy of the VRS RTK and RTK GPS surveying make no greate difference, as RMSE of VRS RTK surveying is 0.144m and that of RTK GPS surveying is 0.146m and the new method would be more efficient.

• Korea journal of population studies
• /
• v.24 no.2
• /
• pp.47-78
• /
• 2001

The primary purpose of this paper is to critically examine the theoretical and methodological issues in the study of generations. The issues include: 1) the concept of generation: 2) the basis of generational formation: 3) internal differentiation of generations: 4) the boundary problems of generations: 4) the boundary problems of generations: and 5) generational differences and generational conflict. From the investigation of these issues, two conclusions are drawn. Firstly, Mannheim's basic concepts and theoretical frameworks are very useful to understand and explain the social movements and sociocultural changes. Secondly, however, further elaboration and modification of the several concepts and frameworks are needed to deal with the problems of generations in general which are not directly connected to social movements. Several points are suggested to elaborate Mannheim's frameworks, which include the reconceptualization of generation, and introducing the concepts of “generation sects” and “manifest-latent generational conflicts”.

• Information Systems Review
• /
• v.15 no.3
• /
• pp.71-87
• /
• 2013

Companies as well as the Korean government show growing attention to the Smart Work which is enabled by the ongoing development of information and communication technologies (ICTs). Smart Work can be regarded as an extended version of telecommuting or distance work and defined as "working efficiently and conveniently regardless of time and place utilizing ICTs." Smart Work currently puts its emphasis on the work and life balance by changing the ways of working. Despite its emphasis on work and life balance, it is expected the boundaries between work and nonwork would blur, work and nonwork boundaries may become more permeable, and role conflicts would occur more times than before. To find ways to enhance work and life balance while escaping from expected conflicts in the context of Smart Work, we investigate the work and nonwork boundary strengths and the factors affecting them. In the course, we consider asymmetries between the work and nonwork boundary strengths and bidirectional nature of work and nonwork permeability. We develop two research models having work and nonwork boundary strengths as respective dependent variables. We empirically found that work role identification and nonwork-to-work permeability had influences on the boundary strength at work and that work-to-nonwork permeability affected the boundary strength at nonwork. However, nonwork role identification did not show any significant influence on the boundary strength at nonwork.

• The KIPS Transactions:PartC
• /
• v.19C no.1
• /
• pp.9-18
• /
• 2012

In 2010, Pedro et al. proposed RFID distance bounding protocol based on WSBC cryptographic puzzle. This paper points out that Pedro et al.'s protocol not only is vulnerable to tag privacy invasion attack and location tracking attack because an attacker can easily obtain the secret key(ID) of a legal tag from the intercepted messages between the reader and the tag, but also requires heavy computation by performing symmetric key operations of the resource limited passive tag and many communication rounds between the reader and the tag. Moreover, to resolve the security weakness and the computation/communication efficiency problems, this paper also present a new RFID distance bounding protocol based on WSBC cryptographic puzzle that can provide strong security and high efficiency. As a result, the proposed protocol not only provides computational and communicational efficiency because it requires secure one-way hash function for the passive tag and it reduces communication rounds, but also provides strong security because both tag and reader use secure one-way hash function to protect their exchanging messages.

• Journal of the Institute of Electronics Engineers of Korea SP
• /
• v.44 no.3
• /
• pp.48-60
• /
• 2007

In previous researches for iris feature extraction, they transform a original iris image into rectangular one by stretching and interpolation, which causes the distortion of iris patterns. Consequently, it reduce iris recognition accuracy. So we are propose the method that extracts iris feature by using polar coordinates without distortion of iris patterns. Our proposed method has three strengths compared with previous researches. First, we extract iris feature directly from polar coordinate circular iris image. Though it requires a little more processing time, there is no degradation of accuracy for iris recognition and we compares the recognition performance of polar coordinate to rectangular type using by Hamming Distance, Cosine Distance and Euclidean Distance. Second, in general, the center position of pupil is different from that of iris due to camera angle, head position and gaze direction of user. So, we propose the method of iris feature detection based on polar coordinate circular iris region, which uses pupil and iris position and radius at the same time. Third, we overcome override point from iris patterns by using polar coordinates circular method. each overlapped point would be extracted from the same position of iris region. To overcome such problem, we modify Gabor filter's size and frequency on first track in order to consider low frequency iris patterns caused by overlapped points. Experimental results showed that EER is 0.29%, d' is 5,9 and EER is 0.16%, d' is 6,4 in case of using conventional rectangular image and proposed method, respectively.

• Korean Journal of Culture and Social Issue
• /
• v.8 no.1
• /
• pp.17-40
• /
• 2002

The purpose of this study is to investigate the differences in the traffic environments and driving behaviors in 5 regions of Korea. Data were collected through the survey research from 1387 passenger car drivers in 14 locations in Korea. The main findings of this research are as followings: First of all, There were significant differences in traffic environment factors(road topography, construction, road & safety facilities, pedestrian behaviors, surrounding drivers) among 5 regional areas. When we examined drivers factors, there were significant differences among 5 metropolitan areas on wearing seat belt, most of constructions related to drink driving, speed-limit violation. There were many differences in driving habits, intentions, behaviors including wearing seat belt, driving after drinking according to metropolitan area, and also in case of speed-limit violation and careless driving behavior. These results suggested that there are many differences in traffic environments and driver's behaviors among regional areas. These result suggests that traffic safety policy and practice should be prepared based upon the peculiarities of regional area. We discussed these resulte in terms of the regional traffic policy and the suggestions for future studies were added.