Aliveness detection based on multispectral analysis for touchless fingerprint recognition

Wonjune Lee,Jungin Lee,Heeseung Choi,Jaihie Kim 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1

Recently, several researches in touchless fingerprint recognition system has been carried out. However, the touchless system is still vulnerable to spoof attacks by artificial fingerprints. In this paper, we introduce an aliveness detection method with multispectral analysis in touchless fingerprint recognition system. Our fingerprint acquisition device includes green, yellow and red illuminations for capturing the fingerprint images. Multispectral properties, especially reflectance of finger are extracted from the acquired fingerprint images under the each of illuminations. These features which can discriminate between live and fake fingerprint images are used and Support Vector Machine (SVM) is applied to classify live and spoof fingerprint image. In our data set, proposed method achieved 0% EER (Equal Error Rate). The results show that our approach can provide an efficient and effective aliveness detection method in the touchless fingerprint image recognition system.

Radiographic analysis of the effect of external rotation on the correction angle in reverse step-cut osteotomy for cubitus varus deformity

Wonjune Chang,Sang Won Moon,Dae-Wook Kim,Seok Hahn,Youngbok Kim 대한견주관절의학회 2022 대한견주관절학회 학술대회논문집 Vol.2022 No.4

Sensor Network for Pipeline Leakage Detection in Nuclear Power Plant

Wonjune Lee(이원준),Sunghyun Cho(조성현) 대한전자공학회 2017 전자공학회논문지 Vol.54 No.12

원자력 발전소 매설 배관은 시설 노후화로 인한 누수를 피하기 어렵다. 매설 배관의 누수는 경제적 손실 및 인명 피해로 이어질 수 있기 때문에 실시간 누수 탐지 시스템은 매우 중요하다. 기존 전통적인 누수 탐지 시스템은 대부분 누수 탐지 도구등을 활용하여 작업자가 일일이 확인하는 방법이었다. 이에 본 논문에서는 매설 배관 누수를 실시간으로 자동 탐지할 수 있는 센서 네트워크 시스템을 제안한다. 배관의 누수를 탐지하는 기존의 대표적 방법은 두 가지가 있다. 첫 째는 청음봉을 이용한 물리적 방법이고 다른 하나는 배관 양단의 센서로부터 진동 신호를 수신하여 상호상관함수를 계산하여 누수를 탐지하는 방법이다. 그러나 두 가지 방법 모두 실시간에 탐지에 취약하고 전문지식이 있는 전문가가 필요하다는 단점이 있다. 이를 해결하기 위해서 다양한 연구가 진행되었으나 대부분 복잡한 필터링 알고리즘이 필요하여 실시간 시스템에 사용하기에 부적합한 단계이다. 본 논문에서는 앞서 살펴본 문제점들을 해결하기 위해 향상된 누수탐지 방법을 기반으로 한 지능형 센서 네트워크 구조를 제안한다. 제안하는 방법의 성능 분석을 위해 실제 구축한 필드 테스트 및 시뮬레이션을 진행하였다. 시뮬레이션 및 필드 테스트에서는 다양한 형태의 네트워크 토폴로지에 대해 누수 탐지 데이터 전송 지연 및 패킷 전송 성공률 등을 측정하였다. 시뮬레이션 결과 네트워크 그리드 크기가 5 이하일 경우에는 선형 네트워크 구조가 더 유리하였고 네트워크 그리드 크기가 5보다 큰 경우에는 애드-혹 네트워크 구조가 전송 지연 감소에 더 유리함을 보였다. It is important to apply real-time remote sensing system for premature pipeline leakage detection of nuclear power plant because of economic damage and human injury due to leakage. There are two typical methods to detect pipeline leakage. One is the physical method using acoustic rod and the other is cross-correlation method by receiving vibration signals from sensors at both ends. In the former method, it needs a specialist with expertise in listening and is hard to process in real-time. The latter method is greatly vulnerable to noise signals. There are a lot of efforts to solve the limitation. However, most of the methods proposed so far are not suitable for practical systems because those require additional filtering algorithms. The filtering algorithms are difficult to process in real time and thus not suitable for nuclear power plants. In order to solve the above problems, we propose an intelligent sensor network system based on the leakage detection with improved cross-correlation function. For the performance evaluation, we implement the testbed and simulation. The field test and simulation results show that the ad-hoc structure is superior than the linear structure when the grid size is less than 5, whereas the linear structure is more advantageous when the grid size is greater than 5.

Decay Heat Estimation of Spent Fuel Assemblies for Decommissioning of Kori Units 3 and 4

Wonjune Mah,Chang-Lak Kim,Sun-kee Lee 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2

This paper mainly focuses on the maximum decay heat estimation generated from spent fuel assemblies in the spent fuel pool of Kori units 3&4 at the beginning decommissioning. It is assumed that the spent fuel pool is fully occupied with 2,260 spent fuel assemblies, same as its design capacity. In addition, equally 56.5 spent fuel assemblies have been generated per year. The minimum cooling time is five years considering the transition phase between the permanent shutdown and the amendment of Operating License for decommissioning. Sending and receiving of spent fuel assemblies to/from other units are neglected. Seven representative spent fuel assembly groups are established based on the burnup rate and cooling time. Conservatively high values for the burnup rates and low values for the cooling times are applied. Calculation of the decay heat of each representative group has been performed by using ORIGEN decay solver of SCALE. Then, total decay heat has been calculated based on this. Group 1, 2, and 3 contain comparatively old spent fuel assemblies with 45 GWd/tU burnup rate and 20~30 cooling years. The calculation shows 489~586 watts of decay heat per assembly. Group 4, 5, 6, and 7 contain comparatively new spent fuel assemblies with 55 GWd/tU burnup rate and 5~20 cooling years. The calculation shows 741~1,483 watts of decay heat per assembly. The total maximum decay heat therefore is estimated as 1,609,459 watts.

Repurposing a Spent Nuclear Fuel Cask for Disposal of Solid Intermediate Level Radioactive Waste From Decommissioning of a Nuclear Power Plant in Korea

Wonjune Mah,Chang-Lak Kim 한국방사성폐기물학회 2022 방사성폐기물학회지 Vol.20 No.3

Operating and decommissioning nuclear power plants generates radioactive waste. This radioactive waste can be categorized into several different levels, for example, low, intermediate, and high, according to the regulations. Currently, low and intermediate-level waste are stored in conventional 200-liter drums to be disposed. However, in Korea, the disposal of intermediate-level radioactive waste is virtually impossible as there are no available facilities. Furthermore, large-sized intermediate- level radioactive waste, such as reactor internals from decommissioning, need to be segmented into smaller sizes so they can be adequately stored in the conventional drums. This segmentation process requires additional costs and also produces secondary waste. Therefore, this paper suggests repurposing the no-longer-used spent nuclear fuel casks. The casks are larger in size than the conventional drums, thus requiring less segmentation of waste. Furthermore, the safety requirements of the spent nuclear fuel casks are severer than those of the drums. Hence, repurposed spent nuclear fuel casks could better address potential risks such as dropping, submerging, or a fire. In addition, the spent nuclear fuel casks need to be disposed in compliance with the regulations for low level radioactive waste. This cost may be avoided by repurposing the casks.

중국공산당의 延邊 朝鮮人사회 장악과정과 그 의의

이원준(Wonjune Lee) 동양사학회 2015 東洋史學硏究 Vol.131 No.-

When the World War Ⅱ had ended, the ethnic Korean socialists who had been working in the Yanbian(延邊) area began to search for a new political order by organizing the Korean masses of Yanbian in their own way. But it was not long before the CCP had intervened and put a stop to this effort. The Han nationality party leaders who had moved in to this area from Yanan(延安) had took control of the upper level party organization of Yanbian by the end of 1945. After dominating the upper level party organization and restricting the power of the Korean socialists of Yanbian, the CCP had moved on to the next stage of infiltrating their power of control to the local society of the Yanbian area. To this end, the CCP in Yanbian had set about their land redistribution campaign, similar to the process widely in activation in the CCP’s rural base areas. In the process of the campaign, the CCP in Yanbian had succeeded in mobilizing the masses and organizing the grass root party organization in the local society of Yanbian. Due to the CCP’s strengthened power of control over the Yanbian society made possible by the land redistribution campaign, the CCP was able to establish the people’s government’s lower level administration system, which enhanced the institutionalization process of Yanbian’s rural base areas. Owing to the success of the land redistribution campaign and the establishment of the administration system in Yanbian area, it was possible for the CCP to get a firm grip of power over the Korean masses in Yanbian, which in time brought about a more clearly defined policy of the local status of the Korean people in Yanbian. They were evidently prescribed as an ethnic minority of China, and they had to become a legal citizen of the people’s government in order to fully secure their gains of the land redistribution and participate in the administration system of Yanbian. Though they were defined as an ‘ethnic minority which has a homeland’, it was evident that their sense of homeland would change in time as the CCP’s nation building effort would get on track.

국공내전 후반기 중국공산당의 華北 중심 건국 방침과 定都문제의 향방

李沅埈(Wonjune Lee) 중국근현대사학회 2015 중국근현대사연구 Vol.65 No.-

This paper focuses on the process of which the CCP had decided to make Beijing their new capital. Due to the difficulties in acquiring archival materials on this matter, this article analyzes the CCP’s ‘North China-centered’ state establishment plan which was put into practice after March of 1948. Since then, the CCP set about unifying their North China base areas, and made the ‘North China Liberated Area’ and its’ ‘North China People’s Government’ the center of nation wide base areas. The establishment of the North China Liberated Area was the signal of the national base area unification process, and the North China People’s Government became the focus of the party’s new policies on the centralization of power, institutionalization, regularization which were promoted to prepare for the forthcoming state building. The fundamental object of the unification of the North China base areas in the mid 1948 was to realize the CCP’s North China-centered state establishment plan, and therefore it was a matter-of-course that the CCP had declared their plan of state establishment in September of 1948 when the North China Liberated Area unification process was successfully completed. Just at that moment, the CCP began to mention Beijing as another option for the site of the New People’s Consultative Conference. Mao Zedong wanted to open the conference at Beijing as far as the battlefront situation was allowed, and from the end of October 1948 he clearly pointed Beijing out as the site of the conference. In early 1949, PLA’s chief commanders and takeover cadres of Beijing were informed that the high authorities of the party had decided Beijing as their new capital, and this decision was officialized in March 1949. This paper concludes that the CCP’s North China-centered state establishment plan was materialized by the unification of the North China Liberated Area and this had formed the base on which the Communists had realized their plan to make Beijing as their new capital. Their are other diverse factors that are considered in deciding capitals, but the importance of the fact that capital cities should be located on the power base area of ‘the ruling force’ counts the most.

중국공산당의 도시 접관 정책과 ‘신민주주의혁명’

이원준(Wonjune Lee) 역사비평사 2016 역사비평 Vol.- No.117

As the Chinese Communists gained the upper hand in the civil war(1946-49) against the Nationalists, the party began to consider the matter of establishing a new state, and this consideration brought about a series of policy changes since early 1948. The formation of the CCP’s urban takeover policy was also the result of this changed situation. As a result, the takeover policy of the CCP was based on the ‘New Democracy Theory’, which formed the foundation of the their revolutionary stance at the time. From the example of the Beijing’s People’s Congress of All Circles, the CCP’s urban takeover policy fully reflected the aims of ‘the New Democratic Revolution’.

Fluctuations of red blood cell membranes: The role of the cytoskeleton

Choi, Wonjune,Yi, Juyeon,Kim, Yong Woon American Physical Society 2015 Physical review. E, Statistical, nonlinear, and so Vol.92 No.1

3D 오토인코더 기반의 뇌 자기공명영상에서 다발성 경화증 병변 검출

최원준(Wonjune Choi),박성수(Seongsu Park),김윤수(Yunsoo Kim),감진규(Jin Kyu Gahm) 한국멀티미디어학회 2021 멀티미디어학회논문지 Vol.24 No.8