• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권2호
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• pp.775-792
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• 2015

Person re-identification is an important and challenging task in computer vision with numerous real world applications. Despite significant progress has been made in the past few years, person re-identification remains an unsolved problem. This paper presents a novel appearance-based approach to person re-identification. The approach exploits region covariance matrix and color histograms to capture the statistical properties and chromatic information of each object. Robustness against low resolution, viewpoint changes and pose variations is achieved by a novel signature, that is, the combination of Log Covariance Matrix feature and HSV histogram (LCMH). In order to further improve re-identification performance, third-party image sets are utilized as a common reference to sufficiently represent any image set with the same type. Distinctive and reliable features for a given image set are extracted through decision boundary between the specific set and a third-party image set supervised by max-margin criteria. This method enables the usage of an existing dataset to represent new image data without time-consuming data collection and annotation. Comparisons with state-of-the-art methods carried out on benchmark datasets demonstrate promising performance of our method.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 Asia Navigation Conference
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• pp.240-257
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• 2006

In an effort to gain competitiveness, recently many companies are trying to outsource their logistics activities to the logistics specialists, while concentrating on their core and strategic business area. Because of this trend, the third party logistics comes to the fore, catching people's attention, and expanding its market rapidly. Under these circumstances, the third party logistics companies are making every effort to improve their logistics services and to develop an information system in order to enhance their competitiveness. In particular, among these efforts one of the critical parts is the decision support system for effective transportation network planning. To this end, this study has developed an efficient decision support system for an optimal transportation network planning by comprehensively considering the transportation mode, routing, assignment, and schedule. As a result of this study, the new system enables the expansion of the third party logistics companies' services including the multimodal transportation, not to mention one mode of transportation, and also gets them ready to plan an international transportation network.

• 대한기계학회논문집A
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• 제25권10호
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• pp.1551-1558
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• 2001

Recently, a number of underground pipelines have been drastically increased. The integrity of these buried pipelines, especially gas transmitting pipelines, is of importance due to an explosive characteristic of natural gas. The third party damage is known as one of the most critical factor which causes fatal accidents. For this reason, a number of systems detecting third party damage are under development. The major concern in the development of third party damage detection system is to transmit vibration signals out of accelerometer to signal conditioner and data acquisition system without any interference caused by noise. The objective of this paper is to develope a fiber optic accelerometer applicable to third party damage detection system. A fiber optic accelerometer was developed by use of combining principles of one degree of freedom vibration model and an extrinsic Fabry-Perot interferometer. The developed fiber optic accelerometer was designed to perform with a sensitivity of 0.06mVg, a frequency range of less than 6kHz and an amplitude range of -200g to 200g. The developed, accelerometer was compared with a piezoelectric accelerometer and calibrated. In order to verify the developed accelerometer, the field experiment was performed. From the field experiment, vibration signals and the location of impact were successfully detected. The developed accelerometer is expected to be used for the third party damage detection system which requires long distance transmission of signals.

• Journal of Information Processing Systems
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• 제14권3호
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• pp.680-693
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• 2018

Nowadays, third-party applications form an important part of the mobile environment, and social networking applications in particular can leave a variety of user footprints compared to other applications. Digital forensics of mobile third-party applications can provide important evidence to forensics investigators. However, most mobile operating systems are now updated on a frequent basis, and developers are constantly releasing new versions of them. For these reasons, forensic investigators experience difficulties in finding the locations and meanings of data during digital investigations. Therefore, this paper presents scenario-based methods of forensic analysis for a specific third-party social networking service application on a specific mobile device. When applied to certain third-party applications, digital forensics can provide forensic investigators with useful data for the investigation process. The main purpose of the forensic analysis proposed in the present paper is to determine whether the general use of third-party applications leaves data in the mobile internal storage of mobile devices and whether such data are meaningful for forensic purposes.

• 디지털융복합연구
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• 제17권8호
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• pp.115-122
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• 2019

두드러진 성장을 보이는 모바일 결제서비스는 한국과 중국에서 다른 양상을 보인다. 모바일 결제서비스에 대한 최근의 연구를 바탕으로 제3자 모바일 결제서비스 기술준비도에 있어 한국과 중국 사이에 근본적 차이가 존재하는지 확인하고자 하였다. 한국과 중국의 대학생을 대상으로 설문조사를 실시하여 자료를 수집하고 기술준비도를 나타내는 각 요인에 대하여 t검정을 실시하였다. 연구결과 기술준비도의 모든 요인에서 한국과 중국 사이에 차이가 있음이 확인되었다. 중국 사용자의 경우 긍정적 요인인 낙관성, 혁신성과 함께 부정적 요인인 불편감 역시 더 높았다. 반면 불안감은 한국 사용자에게서 더 높은 것으로 나타났다. 연구결과를 통해 사용자에 대한 이해를 높이고 제3자 모바일 결제서비스 활성화를 위한 전략적 접근방향을 제시한다. 또한 기술준비도에 대한 통찰력을 높여 관련 연구의 학문적 기초자료가 될 것으로 기대한다.

• 디지털융복합연구
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• 제14권2호
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• pp.131-140
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• 2016

물류서비스는 경제주체간의 원활한 상품 수송을 도모하여 구매, 소비를 뒷받침하는 효율적 경제 및 시장의 필수조건이다. 특히 기업의 물류활동은 소비자에게 전달하고자하는 제품 및 서비스의 생산과 유통을 책임지는 필수 기업활동이자 기업 경쟁력의 원천이다. 그러나 국내 물류기업의 영세성 및 낮은 생산성, 물류산업체계의 비효율성, 2자 물류기업 중심으로 성장하면서 비롯된 전문 제3자 물류 전문시장의 성장 한계, 물류기업의 해외진출 미흡, 물류 전문인력 부족 등이 해결해야 할 과제이다. 따라서 본 연구는 제3자 물류업의 개념과 발전과정을 살펴보고, 국내 제3자 물류업 시장 현황을 분석하여 이를 근거로 수요측면 즉 기업측면, 공급측면, 정부의 정책적 지원측면으로 구분하여 국내 제3자 물류업의 활성화 방안을 제시하였다.

• 디지털융복합연구
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• 제15권1호
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• pp.209-216
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• 2017

우리나라 경제 발전의 핵심동력이라 할 수 있는 재벌구조의 공과는 오랫동안 사회 다양한 분야의 논쟁 대상이었다. 회계학분야에서는 소수의 지배주주에게 집중된 의사결정 구조로 인해 소액주주의 부가 지배주주에 의해 편취되는 이른바 터널링(tunneling) 현상에 주목하여 왔다. 본 연구는 기존 연구들이 터널링의 수단으로 이용될 것으로 의심되는 내부거래에 주목한 것과 같이 대규모기업집단의 내부거래에 주목하여 지배주주의 기회주의적 의사결정이 존재하는지 검증하고자 하였다. 그러나 본 연구는 기존의 연구가 내부거래 전체를 하나의 변수로 다루고 있어 그 함의를 분명하게 파악하지 못하는 편의(bias)가 있었을 것으로 판단하고, 내부거래 대상기업의 특징을 반영하여 내부거래를 세분화함으로써 기존의 연구를 확장하였다. 본 연구는 IMF와 금융위기를 거쳐 오늘날까지 이어지고 있는 재벌 혹은 대기업총수의 도덕적 해이에 대한 단서를 제공하는 한편, 이에 대한 보다 적극적인 대응이 필요함을 시사한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권7호
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• pp.2919-2937
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• 2020

Post-Quantum Cryptography (PQC) is rapidly developing as a stable and reliable quantum-resistant form of cryptography, throughout the industry. Similarly to existing cryptography, however, it does not prevent a third-party from using the secret key when third party obtains the secret key by deception, unauthorized sharing, or unauthorized proxying. The most effective alternative to preventing such illegal use is the utilization of biometrics during the generation of the secret key. In this paper, we propose a biometric-based secret key generation scheme for multivariate quadratic signature schemes, such as Rainbow. This prevents the secret key from being used by an unauthorized third party through biometric recognition. It also generates a shorter secret key by applying Principal Component Analysis (PCA)-based Confidence Interval Analysis (CIA) as a feature extraction method. This scheme's optimized implementation performed well at high speeds.

• Journal of Mechanical Science and Technology
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• 제15권12호
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• pp.1768-1774
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• 2001

Drifting Cups on a Meandering Stream (Kyokusui-no-En) is a Poetry Party that had its origin In ancient China, and was introduced to Japan passing through Korea. The flow of the meandering stream was made clear using the flow visualization techniques, surface floating method, PTV and the numerical simulation. At the same time, the motions of floating cup, the floating speed, relating speed and the trajectory of the cup were also analysed by using an originally developed image processing technique. Based on these researches, the model channel was considered. To make this party interesting the channel must has the characteristic that the drifting cups take the random pass and stagnant at the unexpected place. This model channel is satisfied with these conditions and the fluid mechanics consideration is performed on the both points of the experimental visualization and numerical simulation.

• Management Science and Financial Engineering
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• 제15권1호
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• pp.1-31
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• 2009

This paper considers the value of warehousing contract under probabilistic demands. We consider a supply chain consisting of a supplier, a retailer and its third-party warehousing partner who provides the warehousing service to the retailer through an outsourcing contract. A typical contract is specified by initial space commitment and modification schedule. The retailer decides the order quantity for the supplier and space commitment for the outsourcing contract. Since there is close relationship between order quantity and space commitment to minimize the total cost including ordering cost, inventory carrying cost, shortage cost, and warehousing cost, we develop an analytical model under probabilistic demands, where the retailer can determine the optimal order size and space commitment level jointly. We found the closed-form optimum for a single-period case and the optimal conditions for a two-period case. To evaluate the value of contract flexibility for the two-period case, we compared the total cost under two policies; one with modification, under which the base commitment can be changed at the start of each period and the other without modification. From results of our numerical analysis, we showed that the modification policy is more cost-effective as the variability of demand increases.