• International journal of advanced smart convergence
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• 제9권3호
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• pp.246-252
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• 2020

Facial recognition is a biometric technology that is used in various fields such as user authentication and identification of human characteristics. Face recognition applications are practically used in various fields, but very few applications have been developed to improve the factory work environment. We implemented applications that uses face recognition to identify a specific employee in a factory .work environment and provide customized information for each employee. Factory workers need documents describing the work in order to do their assigned work. Factory managers can use our application to register documents needed for each worker, and workers can view the documents assigned to them. Each worker is identified using face recognition, and by tracking the worker's face during work, it is possible to know that the worker is in the workplace. In addition, as a mobile app for workers is provided, workers can view the contents using a tablet, and we have defined a simple communication protocol to exchange information between our applications. We demonstrated the applications in a factory work environment and found several improvements were required for practical use. We expect these results can be used to improve factory work environments.

• International journal of advanced smart convergence
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• 제6권1호
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• pp.26-31
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• 2017

When mobile navigator device accesses data randomly, the cache memory performance is rapidly deteriorated due to low memory access locality. For instance, GPS (General Positioning System) of navigator program for automobiles or drones, that are currently in common use, uses data from 32 satellites and computes current position of a receiver. This computation of positioning is the major part of GPS which accounts more than 50% computation in the program. In this computation task, the satellite signals are received in real time and stored in buffer memories. At this task, since necessary data cannot be sequentially stored, the data is read and used at random. This data accessing patterns are generated randomly, thus, memory system performance is worse by low data locality. As a result, it is difficult to process data in real time due to low data localization. Improving the low memory access locality inherited on the algorithms of conventional communication applications requires a certain optimization technique to solve this problem. In this study, we try to do optimizations with data and memory to improve the locality problem. In experiment, we show that our case study can improve processing speed of core computation and improve our overall system performance by 14%.

• 대한임베디드공학회논문지
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• 제11권6호
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• pp.325-334
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• 2016

Recently, Open Computing Language (OpenCL) has been proposed to provide a framework that supports heterogeneous computing platforms. By using an OpenCL framework, digital communication systems can support various protocols in a unified computing environment to achieve both high portability and high performance. This article introduces a parallel software decoder of Low Density Parity Check (LDPC) codes for China Multimedia Mobile Broadcasting (CMMB) on a heterogeneous platform. Each step of LDPC decoding has different parallelization characteristics. In this paper, steps suitable for task-level parallelization are executed on the CPU, and steps suitable for data-level parallelization are processed by the GPU. To improve the performance of the proposed OpenCL kernels for LDPC decoding operations, explicit thread scheduling, loop-unrolling, and effective data transfer techniques are applied. The proposed LDPC decoder achieves high performance by using heterogeneous multi-core processors on a unified computing framework.

• International Journal of Advanced Culture Technology
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• 제4권2호
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• pp.7-18
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• 2016

The first D2C-era web-real variety show in Korea was broadcast via tvN of CJ E&M. The web-real variety program 'SinSeoYuGi' accumulated 54 million views, along with 50 million views at the Chinese portal site QQ. This study carries out an analysis using text mining that extracts portal site blogs, twitter page views and associative terms. In addition, this study derives viewers' response by extracting key words with opinion mining techniques that divide positive words, neutral words and negative words through customer sentiment analysis. It is found that the success factors of the web-real variety were reduced in appearance fees and production cost, harmony between actual cast members and scenario characters, mobile TV programing, and pre-roll advertising. It is expected that web-real variety broadcasting will increase in value as web contents in the future, and be established as a new genre with the job of 'technical marketer' growing as well.

• International journal of advanced smart convergence
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• 제5권3호
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• pp.16-26
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• 2016

This proposed project is about a bicycle anti theft devised system which helps people protect the bicycle from theft and helps to track the stolen bicycle's location using a smart phone. Safety bike uses two main devices to keep the bicycle secured, the vibration sensor and GPS sensor. The purpose of this project is to put all these small devices into one well connected system which will help the bicycle owner have more control over the security of his own bicycle. The whole system can be divided into two main parts. The first part is about the hardware development whereby all electronics components are connected via the circuit design using wire wrapping technique. This hardware part includes, a vibrations sensor, a GPS receiver, a toggle switch, LED light, Bluetooth and a buzzer. Wireless Bluetooth signals are used as the means of communication between the smartphone and the microcontroller. The second part is the software part which is being to program and control the whole system. The program is written using MikroBasic, a full-featured Basic compiler for microcontroller based systems. In conclusion, this system is designed to enable user to have control in securing his/her bicycle also being able to find and locate it at any time using GPS receiver and mobile android application.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2011년도 제43차 동계학술발표논문집 19권1호
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• pp.211-215
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• 2011

본 연구에서는 정보기술 혁신 제품이 출시되었을 때 소비자가 수용하는 과정에서 혁신 제품의 유용성 기대와 혁신제품에 대한 거부의 요인에 의해 사용의도가 형성된다는 관점에서 혁신 제품의 수용과정을 연구하였다. 휴대전화 사용자들 중 스마트폰을 사용하지 않는 소비자들을 대상으로 실증연구를 하였다. 연구결과, 첫째, 정보기술 혁신제품에 대한 소비자의 유용성 기대는 사용의도에 정적(+)으로 영향을 미치고, 혁신 제품에 대한 거부감은 부적(+)으로 영향을 미치며, 유용성 기대는 거부감에 부적(-)으로 영향을 미치는 것으로 나타났다. 둘째, 소비자의 혁신 제품에 대한 유용성 기대에 정적(+)으로 영향을 미치는 요인으로 사회적 요인이 있었고, 기존 제품에 대한 만족은 유용성 기대에 부적(-)으로 영향을 미쳤다. 셋째, 소비자의 혁신 제품 거부에 영향을 미치는 요인들로 소비자의 기존 제품에 대한 만족과 소요되는 노력 예상이 있었다. 이러한 연구결과들에 근거하여, 소비자가 정보기술 혁신 제품에 대해 유용성을 기대하더라도 거부감을 가지고 있다면 해당 제품을 사용할 의도를 갖지 않기 때문에 이에 대한 전략이 필요하다.

• International journal of advanced smart convergence
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• 제2권1호
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• pp.6-11
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• 2013

Network Coding (NC) is a new paradigm for network communication. In network coding, intermediate nodes create new packets by algebraically combining ingress packets and send it to its neighbor node by broadcast manner. NC has rapidly emerged as a major research area in information theory due to its wide applicability to communication through real networks. Network coding is expected to improve throughput and channel efficiency in the wireless multi-hop network. Many researches have been carried out to employ network coding to wireless ad-hoc network. In this paper, we proposed a dynamic queue management to improve coding opportunistic to enhance efficiency of NC. In our design, intermediate nodes are buffering incoming packets to encode queue. We expect that the proposed algorithm shall improve encoding rate of network coded packet and also reduce end to end latency. From the simulation, the proposed algorithm achieved better performance in terms of coding gain and packet delivery rate than static queue management scheme.

• International journal of advanced smart convergence
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• 제9권2호
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• pp.68-75
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• 2020

Non-orthogonal multiple access (NOMA) has gained the significant attention in the fifth generation (5G) mobile communication, which enables the advanced smart convergence of the artificial intelligence (AI), the internet of things (IoT), and many of the state-of-the-art technologies. Recently, correlated superposition coding (SC) has been proposed in NOMA, to achieve the near-perfect successive interference cancellation (SIC) bit-error rate (BER) performance for the stronger channel users, and to mitigate the severe BER performance degradation for the weaker channel users. In the correlated SC NOMA scheme, the stronger channel user BER performance is even better than the perfect SIC BER performance, for some range of the power allocation factor. However, such excessively good BER performance is not good for the user-fairness, i.e., the more power to the weaker channel user and the less power to the stronger channel user, because the excessively good BER performance of the stronger channel user results in the worse BER performance of the weaker channel user. Therefore, in this paper, we propose the power splitting to establish the user-fairness between both users. First, we derive a closed-form expression for the power splitting factor. Then it is shown that in terms of BER performance, the user-fairness is established between the two users. In result, the power splitting scheme could be considered in correlated SC NOMA for the user-fairness.

• 한국통신학회논문지
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• 제30권8B호
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• pp.562-568
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• 2005

본 논문은 방송통신 융합형 음성서비스라는 신규통신서비스가 시장에 등장했을 경우 어떻게 가격을 설정할 것인지에 관한 내용이다. 우선 가격결정방법 및 결정시스템에 대한 기존 문헌조사를 바탕으로 기 연구된 방법론의 문제점을 도출 한 후 "신서비스 시장진입 가격결정을 위한 기업의 가격설정 의사결정모형 제안하고 있다. 이후 본 논문에서 제시하고 있는 모형에 기반하여 신규 서비스인 방송통신 융합형 음성서비스의 초기 시장진입가격 결정하는 일련의 분석과정을 통하여, 논문에서 제시하고 있는 가격결정모형이 실제 기업에서 충분히 활용할 수 있는 현실적인 의사결정시스템 모형이 될 수 있는 타당성을 검증하고자 한다.

• 한국게임학회 논문지
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• 제11권6호
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• pp.95-102
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• 2011

현재 와이파이가 지원되는 스마트폰 시장이 급격히 증가하면서 스마트 폰을 기반으로 하는 네트워크 콘텐츠 가 빠르게 보급되고 있다. 하지만, 아직까지 와이파이가 지원되지 않거나 블루투스 환경만을 제공하는 피처폰이나 기타 멀티미디어 기기 등에서는 네트워크 콘텐츠를 제공하기 힘든 환경이다. 본 논문에서는 블루투스, 와이파이 등의 기술보다도 저전력, 저가격, 사용의 용이성, 다채널, 브로드캐스팅을 지원하는 지그비 기술을 이용하였다. 근거리 네트워크 게임에 지그비 기술을 이용함으로써 다양한 형태의 네트워크 게임을 개발할 수 있을 것이다. 또한, 이를 이용한 다양한 무선 네트워크 컨텐츠의 개발을 기대할 수 있을 것이다.