• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.07a
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• pp.518-521
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• 2015

컴퓨터 비전이나 감시영상 시스템에서 유동인구 수 측정은 보안 및 경제적 측면에서 중요한 과제이다. 본 논문에서는 RGB센서와 Depth센서를 이용해서 유동 인체를 식별하고 추적하며, 유동인구 수를 측정하는 방법을 제안한다. 제안된 방법은 받아온 영상에서 유동인체를 검출하고, 검출된 인체를 추적한다. 추적된 정보는 이동방향 인식을 하기 위해 사용된다. 중첩에 대한 문제를 해결하기 위해 Merge&Separate 방법과 Kinect Merge&Separate방법을 제안한다. 검출된 유동인체에 대한 정보는 다양한 변수들로 저장된다. 또한 RGB센서와 Depth센서의 장단점을 상호 보완할 수 있는 인체 매칭 시스템을 제안한다. 본 논문의 실험은 자체적으로 제작한 영상을 사용하여 실험을 진행하였다. 실험을 통하여 제안된 유동인구 수 측정 시스템이 유동인구 검출률을 향상시킬 수 있음을 보여준다.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06b
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• pp.280-282
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• 2006

저장매체의 대용량화와 인터넷을 이용한 디지털 음원의 활성화로 개인이 소유하는 음원이 급속도로 증가하고 있다. 많은 양의 음원을 보유하고 있는 상황에서 사용자의 편의를 증가시키기 위하여 다양한 검색/분류 방법들이 개발되고 사용되고 있다. 본 논문에서는 음원에 사용된 표현방식이나 디렉토리 구조, 파일이름, 텍스트 태그 등에 독립적으로 적용될 수 있도록 디지털 신호처리 이론에 기반하여 파형데이터를 분석하고, 화성학 이론에 기반한 패턴매칭 기술을 응용하여 음악의 장르와 나아가 분위기를 기반으로 분류하는 방법을 제시한다.

• Journal of Information Technology Applications and Management
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• v.28 no.4
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• pp.33-43
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• 2021

While youth unemployment has recorded the lowest level since the global COVID-19 pandemic, SMEs(small and medium sized enterprises) are still struggling to fill vacancies. It is difficult for SMEs to find good candidates as well as for job seekers to find appropriate job offers due to information mismatch. To overcome information mismatch, this study proposes the fine-turning model for bidirectional HR matching based on a pre-learning language model called BERT(Bidirectional Encoder Representations from Transformers). The proposed model is capable to recommend job openings suitable for the applicant, or applicants appropriate for the job through sufficient pre-learning of terms including technical jargons. The results of the experiment demonstrate the superior performance of our model in terms of precision, recall, and f1-score compared to the existing content-based metric learning model. This study provides insights for developing practical models for job recommendations and offers suggestions for future research.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.970-973
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• 2007

사용자에게 제공하는 일반적인 텔레매틱스 서비스들은 광역 서비스로 한정되어 있고 특정 관심지점(POI, Point-of-Interest)에 대한 경로와 간략한 안내 서비스만을 제공하고 있다. 그러나 사용자들은 광역 서비스뿐만 아니라 POI 지점의 상세 서비스들도 제공받기를 원한다. 따라서, 각 POI 지점에서의 상세 서비스를 지원하고 이를 관리 제어할 수 있는 텔레매틱스 POI 응용 서비스가 요구되고 있다. 본 논문에서는 POI 지점의 상세 서비스를 제공하기 위하여 GIS 기반 텔레매틱스 POI 응용 서비스를 설계하고 텔레매틱스 POI 단말을 설계/구현한다. 구현된 텔레매틱스 POI 단말은 GPS 모듈로부터 좌표를 수신하고 Shape 뷰어에서 파싱하여 현재위치를 구한다. ESRI Shape 파일 및 DBF 파일을 파싱하여 현재위치와 매칭시킨 후 POI 상세 서비스를 디스플레이 한다.

• Journal of Labour Economics
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• v.41 no.2
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• pp.61-88
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• 2018

This paper examines the impact of internal migration on wage growth among college graduates using Propensity Score Matching methods. We define migration as moving between Seoul Metropolitan Area (SMA) and non-SMA based on the locations of graduates' first and second jobs. We also take the direction of migration into account for examining the wage premium in SMA. In order to estimate the impact of migration on wage growth, we use the Graduate Occupational Mobility Survey (2010GOMS) coupled with other supplementary data such as College Scholastic Ability Test score and local characteristic variables. The results reveals that graduates moving from SMA to non-SMA do not experience significant wage growth. However, we find that graduates moving from non-SMA to SMA experience an increase in their monthly wage about 170,000~186,000 KRW on average (9.5~10.3% of their monthly wage on the first job).

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.48 no.2
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• pp.66-77
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• 2011

We propose a framework for grouping photographic advertising images that employs a hierarchical indexing scheme based on efficient feature combinations. The study provides one specific application of effective tools for monitoring photographic advertising information through online and offline channels. Specifically, it develops a preprocessor for advertising image information tracking. We consider both global features that contain general information on the overall image and local features that are based on local image characteristics. The developed local features are invariant under image rotation and scale, the addition of noise, and change in illumination. Thus, they successfully achieve reliable matching between different views of a scene across affine transformations and exhibit high accuracy in the search for matched pairs of identical images. The method works with global features in advance to organize coarse clusters that consist of several image groups among the image data and then executes fine matching with local features within each cluster to construct elaborate clusters that are separated by identical image groups. In order to decrease the computational time, we apply a conventional clustering method to group images together that are similar in their global characteristics in order to overcome the drawback of excessive time for fine matching time by using local features between identical images.

• Journal of Advanced Marine Engineering and Technology
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• v.39 no.6
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• pp.626-632
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• 2015

The International Maritime Organization (IMO) has adopted several regulations for the prevention of air pollution from ships. In addition, there is a requirement for shipping liners to reduce greenhouse gas emissions. Accordingly, we need to take measurements to ensure that the steps taken are both efficient and environmentally friendly. It has been determined that the application of the Miller cycle in diesel engines has the effect of both reducing the amount of NOx and improving thermal efficiency. However, this method requires a considerably larger charge air pressure. Therefore, we consider a two-stage turbo-charging system, which not only results in a high charging pressure, but also improves the part load performance with an exhaust-gas bypass system or the application of the Miller cycle. Because of complications associated with the two-stage turbo-charging system, it is complex and difficult to realize a design that optimizes matching between diesel engine and turbo-chargers. Accordingly, it is necessary to perform a quantitative analysis to determine the effects and optimal conditions of these different systems in the early stage of system design. In this paper, we develop a simulation program to model these systems, and we verify that the results of this program are reliable. Further, we discuss methods that can be employed to improve its efficiency.

• The KIPS Transactions:PartD
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• v.11D no.5
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• pp.1063-1072
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• 2004

In the ASP(Application Service Provider) business, applications using database sometimes require some data from clients' databases. These days such data are extracted from client database using manual database operations as an EXCEL file and the ASP, once receiving this file, transfers it into the application's database using manual database operations. This paper describes how to deal with data transmitting between the client database and ASP database on the web without using database manual operations for data extraction and insertion. We propose a framework which enables to transmit client data in a systematical way, to match different attribute names of each database for sharing same attribute values, and to avoid exposing information about the network path of client database to the ASP. This approach consists of two steps of data processing. The first is extracting data from client database as XML format by using a downloaded client program from ASP site, the second is uploading and storing the XML file into the ASP database. The implemented prototype system shows the suggested data integration paradigm is valid and ASP business needing integration of client database can be activated using it.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.3
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• pp.729-736
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• 2010

In this study, a magnetic stimulation (MS) device with controllable pulse forming technology and pulse shape (MS) is described. The MS device uses an IGBT with appropriate snubbers to switch coil currents up to 6 kA, enabling pulse forming technology control from 5 s to over 100 s. The induced electric field pulses use 2% - 34% less energy and generate 57% - 67% less coil heating compared to matched conventional cosine pulses. MS is used to stimulate rhesus monkey motor cortex in vivo with pulse forming technology of 20 to 100 s, demonstrating the expected decrease of threshold pulse amplitude with increasing pulse forming technology. The technological solutions used in the MS prototype can expand functionality, and reduce power consumption and coil heating in MS, enhancing its research and therapeutic applications.

• Journal of KIISE
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• v.44 no.10
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• pp.1071-1080
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• 2017

With today's complex networks, asset identification of network devices is becoming an important issue in management and security. Because these assets are connected to the network, it is also important to identify the network structure and to verify the location and connection status of each asset. This can be used to identify vulnerabilities in the network architecture and find solutions to minimize these vulnerabilities. However, in an IoT(Internet of Things) network with a small amount of resources, the Traceroute packets sent by the monitors may overload the IoT devices to determine the network structure. In this paper, we describe how we improved the existing the well-known double-tree algorithm to effectively reduce the load on the network of IoT devices. To balance the load, this paper proposes a new destination-matching algorithm and attempts to search for the path that does not overlap the current search path statistically. This balances the load on the network and additionally balances the monitor's resource usage.