• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.4A
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• pp.260-268
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• 2012

The use of an error-correcting code is essential in communication systems where the channel is noisy. Unless a receiver has accurate channel coding parameters, it becomes difficult to decode the digitized encoding bits correctly. In this paper, we propose two algorithms for reconstructing convolutional codes: one for general convolutional codes and the other for punctured convolutional codes. And we also verify the algorithms by performing intensive computer simulation in additive white gaussian noise (AWGN) channel.

• Proceedings of the KSPS conference
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• 2007.05a
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• pp.158-162
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• 2007

Anomia, word finding difficulty, is one of the most common feature in aphasia. Previous studies support that the process of picture naming consists of three stages, in the order of the object recognition, semantic, and phonological output stages. Anomic patients have many symptoms and it means that anomia can be sub-divided into several symptom groups. Our anomia assessment battery consists of several parts: (1) picture naming set, (2) picture-word matching task, (3) lexical decision task for mental lexicon damage, (4) naming task for phonological lexicon damage, and (5) semantic decision task. Pictures and words were selected on the basis of usage frequency, semantic category, and word length. We administered this anomia evaluation battery to many anomic aphasics and we subdivided patients into several groups. We hope that our anomia evaluation set is useful and helpful for evaluation anomic aphasics

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.1A
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• pp.43-50
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• 2012

The use of an error-correcting code is essential in digital communication systems where the channel is noisy. Unless a receiver has accurate channel coding parameters, it becomes difficult to decode the digitized encoding bits correctly. In this paper, estimation algorithm for RM(Reed-Muller) codes using FHT (Fast Hadamard algorithm) is proposed. The proposed algorithm estimates the channel coding parameters of RM codes and then decodes the codes using the characteristic of FHT. And we also verify the algorithm by performing intensive computer simulation in additive white gaussian noise (AWGN) channel.

• Proceedings of the Korean Society of Computer Information Conference
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• 2017.07a
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• pp.174-175
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• 2017

본 논문에서는 기존 결제서비스에서 모바일 결제서비스로의 전환의도에 영향을 미치는 요인을 살펴보고자 한다. 2요인 이론(Two-factor theory)을 기반으로 전환을 가능하게 하는 요인과 전환을 억제하는 요인으로 구분하였으며, 기대된 전환혜택과 기대된 전환비용에 어떠한 영향을 미치는지 파악하고자 한다. 또한 전환혜택과 전환비용을 매개로 전환의도에 미치는 영향까지 확인하고자 한다. 스마트폰과 신용카드 또는 체크카드 사용자를 대상으로 조사를 실시하였고, 연구가설에 대한 유의성을 검증하기 위해서 구조방정식 모형을 사용하여 Smart PLS 3.0으로 분석하였다. 연구결과, 세 개의 가설이 기각되었으며, 총 4개의 가설이 채택되었다. 본 연구는 모바일 결제서비스에 대한 수용의도를 연구한 기존연구들과는 다르게 기존 서비스에서 새로운 정보기술이나 서비스로의 전환의도에 관해 연구하였다는 점에서 의의가 있다.

• Journal of the Society of Naval Architects of Korea
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• v.53 no.5
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• pp.428-434
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• 2016

A lot of drawings for pipe construction and installation are needed to construct plant process system on the offshore plant structures. Depending on their scale or complexity, the required number of drawings related pipes sometimes amounts to several hundreds of thousands. Most major shipyards, therefore, have their own system which can automatically depict pipes’ geometric, manufacturing, and BOM(Bill of Material) information on the drawings. However, as the complexity and absolute quantity in the isometric region on the drawings is increased, the information extraction from the customized DB and positioning at the typical locations does not get to be enough to avoid the overlap between geometric contours, labels, and symbols. For this reason, the novel methods to arrange additional annotations without overlaps are presented in the paper. This approach is expected to increase the readability and legibility of the drawing and prevent the human error, and finally decrease the time-consuming and tedious jobs which are unnecessarily required to designers.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.07a
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• pp.262-264
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• 2018

Many of users play Mobil Social Network Games (M-SNG). M-SNGs are played through social network, and typically features multiplayer and asynchronous gameplay mechanics. It is most often implemented as mobile devices with mobile instant messenger app. Kakaotalk provids mobile game platform. The purpose of this study is to find significant factors that have effects on the commitment of M-SNGs. We also conduct multi-group comparison test to study the difference in factors of models between time t and time t1. Time t is October, 2012 and time t1 is April, 2016. This study is to empirically test the research model using data collected from M-SNGs' users. We survey two different groups of time t and time t1 people with the same model. We use structural equation model analysis with AMOS 18.0 and compare two models of different times. This study is to give academicians and practitioners insight about its effects and implications

• Nuclear Engineering and Technology
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• v.52 no.10
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• pp.2339-2345
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• 2020

Radiation imaging systems consisting of a large number of channels greatly benefit from multiplexing methods to reduce the number of channels with minimizing the system complexity and development cost. In conventional pixelated radiation detector modules, such as anger logic, is used to reduce a large number of channels that transmit signals to a data acquisition system. However, these methods have limitations of electrical noise and distortion at the detector edge. To solve these problems, a multiplexing concept using a digital signal encoding technique based on a time delay method for signals from detectors was developed in this study. The digital encoding multiplexing (DEM) method was developed based on the time-over-threshold (ToT) method to provide more information including the activation time, position, and energy in one-bit line. This is the major advantage of the DEM method as compared with the traditional ToT method providing only energy information. The energy was measured and calibrated by the ToT method. The energy resolution and coincidence time resolution were observed as 16% and 2.4 ns, respectively, with DEM. The position was successfully distributed on each channel. This study demonstrated the feasibility that DEM was useful to reduce the number of detector channels.

• KIPS Transactions on Software and Data Engineering
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• v.2 no.1
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• pp.19-26
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• 2013

To improve the reliability and quality of software system, many studies of the testing based on state-transition diagram have been in progress. Existing studies tried to solve the complexity problem of state-transition diagram. But the development of test case demands the better way to derive and manage the state diagram with low complexity. In this paper, the STMT(State-Transition Mapping Tree) is proposed to decrease the complexity of state diagram without changing or loosing the original state or transition information. Comparing with other methods, the proposed method turns out to be less complex.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.415-417
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• 2015

사용자는 자신의 주변상황에 대한 정보를 수집 및 공유하기 위하여 SNS, 포탈사이트 및 커뮤니티를 사용한다. 본 논문에서는 사용자의 특성을 고려한 지역정보 수집 아이디어와 방법론을 제시한다. 또한 각각의 웹 시스템의 데이터를 수집하여, 광범위한 지역정보를 마이닝을 수행하고 가공해내는 시스템을 제안한다. 이를 위해 해결해야하는 이슈는 다음과 같다. 각 웹시스템의 문서들은 운영 체제에 따라 인코딩이 달리 사용되는데, 흔히 발생되는 오류 중 하나인 문자깨짐 현상이 그 예이다. 해결방법으로써 문서가 작성된 운영체제의 인코딩정보를 획득해야하며, 이 정보는 서버에서 제공하는 헤더정보에 명시되었거나 문서내에 내장되어 있다. 하지만 일부 웹사이트는 인코딩 정보를 제공하지 않으며, 국가별 인코딩이 다르기 때문에 이를 알기 쉽지않다. 그리하여 본 논문에서 제안하는 방법론은 텍스트 마이닝에 앞서 웹서버에서 제공하는 웹페이지를 읽어들여 인코딩정보를 획득하고, 문자의 깨짐없이 표시할 수 있도록 시스템을 구축하기 위해 Response Header, HTML의 meta tag 및 읽어드린 문서의 BOM(Byte Order Mark) 정보 및 인코딩 패턴을 통해 인식하도록 하여 글자 깨짐을 완하하도록 시스템을 설계하였다.

• Journal of The Korean Society of Integrative Medicine
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• v.2 no.1
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• pp.109-116
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• 2014

Purpose : The purpose of this study was to perform the calf-raise exercise on the stable support surface and unstable support surface for comparing deference of the gastrocnemius thickness changes that measured by ultrasonography. Method : Subjects stand on unstable support surface and a stable support surface with both feet. Keeping calf-raise position in the 3 seconds, and then had to return back to the starting position. Total of 3 sets of 15 repetitions performed and give a 30-second rest between each set. In this way, exercise performed 3 times a week, performed a total of 6 weeks. Result : 1. gastrocnemius muscle thickness before and after exercise in experimental group A was significantly different(p<.05). 2. gastrocnemius muscle thickness before and after exercise in experimental group B was significantly different(p<.05). 3. gastrocnemius muscle thickness in experimental group A and experimental group B was significantly difference(p<.05). Conclusion : In conclusion, calf-raise exercise on unstable support surface was more efficient than stable support surface for increasing thickness of gastrocnemius.