• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.333-334
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• 2008

With the role of cell phones in today's society as a digital personal assistant as well as the primary tool for personal communication, it is possible to imagine the involvement of cell phones in almost any type of crime. The progression of a criminal investigation can hinge on vital clues obtained from a cell phone. This paper will be concentrated on CDMA system phones and focus on the data extraction for cell phone forensics. Especially, the data acquisition method of JTAG interface access to memory chip will be covered.

• Human Ecology Research
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• 제52권5호
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• pp.519-528
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• 2014

This study explores how the main variables of youth going through a transition period (parents' nurturing behavior, the youth's self-esteem and ego resilience, the peer group relationships) affect the youth's school adjustment. It also analyzes the effects of theses variables on the youth's dependence on cell phones, which are considered a necessity in modern society. This research is verified by using a structure model verification method based on data from the Korean Children Youth Panel Study. According to the research, first, 1st-year students in middle school show better adjustment to their school life and less dependence on cell phones when they have a stronger sense of self-esteem and ego resilience; further, it is revealed that cell phone dependence has an indirect influence on the school life of these children. Second, they tend to show better adjustment to their school life and less dependence on cell phones when their parents' nurturing behaviors are more positive. Third, these children tend to depend more on cell phones when they have a positive peer group relationship, Moreover, cell phone dependence has an indirect influence on their school life. When considering the impact of cell phone to youth in modern society, need to prepare proper training program for correct uses and preventing from addiction.

• International Journal of Oral Biology
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• 제39권3호
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• pp.137-143
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• 2014

Dental professionals are repeatedly exposed to many microorganisms present in both blood and saliva. Thus, dental professionals are at a greater risk of acquiring and spreading infections, and the implementation of infections control guidelines is necessary. Cellular phones have become a necessary device for communicating in hospitals. Cellular phones contaminated with bacteria may serve as a fomite in the transmission of pathogens by the hands of medical personnel. Nevertheless, studies about rate and levels of bacterial contamination of cellular phones have been extremely limited with regards to dental personnel. The purpose of this study was to identify bacterial flora on the cellular phones of dentists by a molecular biological method using the 16S rRNA cloning and sequencing method. We acquired total 200 clones from dentists' cell phones and identified the bacterial species. Pseudomonas (34.6%), Lactobacillus (18.5%), Azomonas (11.5%), and Janthinobacterium (6%) were the dominant genera on dentists' cell phones. The oral bacteria identified were Anaerococcus lactolyticus, Gibbsiella dentisursi, Lactobacills leiae, Streptococcus mitis, Streptococcus oligofermentans, and Streptococcus sanguinis. Pathogenic bacteria and opportunistic pathogens such as Carnobacterium funditum, Raoultella planticola, Shigella flexneri, Lactobacillus iners, Staphylococcus aureus, and Staphylococcus epidermidis were also identified.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2008년도 춘계학술대회논문집
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• pp.224-229
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• 2008

With the wide use of mobile phones, a paging signal by a sound transducer acts as an environmental noise on many occasions, thus necessitating an alternative paging signal by a vibration motor. Conventional vibration motors employ three-phase windings with mechanical brushes for commutation. In this paper, a new one-phase brushless and sensorless vibration motor is introduced utilizing digital signal processor chips in cell-phones. For electromagnetic field analysis, two-dimensional modeling can be implemented to determine the back electromotive force using axisymmetric boundary conditions. Geometric design parameters, such as coil pitch and magnet pitch. are considered for performance optimization. Through the experiments, it is shown that the proposed design has the equivalent performance with reduced number of parts, thus enhancing manufacturing productivity and reducing manufacturing cost.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2010년도 추계학술발표대회
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• pp.1118-1121
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• 2010

With the advent of cell phone digital cameras, and sophisticated photo editing software, digital images can be easily manipulated and altered. Although good forgeries may leave no visual clues of having been tampered with, they may, nevertheless, alter the underlying statistics of an image. Most digital camera equipped in cell phones employ a single image sensor in conjunction with a color filter array (CFA), and then interpolates the missing color samples to obtain a three channel color image. This interpolation introduces specific correlations which are likely to be destroyed when tampering with an image. We quantify the specific correlations introduced by CFA interpolation, and describe how these correlations, or lack thereof, can be automatically detected in any portion of an image. We show the efficacy of this approach in revealing traces of digital tampering in lossless and lossy compressed color images interpolated with several different CFA algorithms in test cell phones.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2006년도 학술대회 1부
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• pp.684-691
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• 2006

As many functionalities such as cameras and MP3 players are converged to mobile phones, more intuitive and interesting interaction methods are essential. In this paper, we present applications and their enabling technologies for gesture interactive cell phones. They employ gesture recognition and real-time shake detection algorithm for supporting motion-based user interface and entertainment applications respectively. The gesture recognition algorithm classifies users' movement into one of predefined gestures by modeling basic components of acceleration signals and their relationships. The recognition performance is further enhanced by discriminating frequently confusing classes with support vector machines. The shake detection algorithm detects in real time the exact motion moment when the phone is shaken significantly by utilizing variance and mean of acceleration signals. The gesture interaction algorithms show reliable performance for commercialization; with 100 novice users, the average recognition rate was 96.9% on 11 gestures (digits 1-9, O, X) and users' movements were detected in real time. We have applied the motion understanding technologies to Samsung cell phones in Korean, American, Chinese and European markets since May 2005.

• 자원리싸이클링
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• 제24권3호
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• pp.76-80
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• 2015

오늘날 개인의 필수 품목이 된 휴대폰은 국내에서 매년 2,000만대 이상이 폐기되는 것으로 추정되고 있다. 휴대폰에는 유가금속 뿐만 아니라 유해금속이 들어있기 때문에 적절한 재활용이 필요하다. 휴대폰에 함유된 유용금속성분의 함량에 따라 재활용공정에서의 경제성이 달라지기에 성분의 분석이 중요하다. 본 연구에서는 폐휴대폰에 함유된 금속 성분의 년도별 변화를 보았다. 2000년에서 2009년에 제조된 휴대폰을 대상으로 휴대폰내의 인쇄회로기판의 성분과 함량을 조사하고 함량의 변화추이를 확인하였다. 분석결과 귀금속인 팔라듐과 중금속인 납의 함량은 감소하는 경향을 보였다.

• 한국인터넷방송통신학회논문지
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• 제12권2호
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• pp.53-59
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• 2012

현대 생활에 있어서 스마트폰은 매우 편리한 도구이다. 그러나 장소와 시간에 따라 스마트폰을 반드시 무음모드로 전환하여야 한다. 항시 휴대하는 휴대폰은 매우 편리하지만, 부적절한 장소와 시간에 울리는 벨소리를 무음모드로 전환해야 하는 불편이 있다. 본 논문에서는 안드로이드 운영체제의 스마트 폰의 GPS와 계산 기능을 사용하여 특정 장소와 시간에 무음모드로 자동 전환하는 스마트 폰 앱을 개발하였다. 원하는 장소와 시간에 맞추어 무음모드로 자동 전환시킴으로서 실생활에 많은 편리성을 줄 것으로 기대된다.

• 대한의생명과학회지
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• 제14권4호
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• pp.257-261
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• 2008

Cellular phones are the most used electronic device everyday in modern life and are always in contact with our hands, Although many studies have revealed microorganisms living on our hands, there are only a few reports on the research about products or places which are in contact with our hands. Therefore, the purpose of this study is to verify microorganisms living in cellular phones. Microorganisms were scraped from cellular phones of students and professors from the clinical laboratory science department in Daegu Health College, and cultured at Brain Heart Infusion agar and MacConkey agar following API kit to identify them. The average colony number was $1.5{\times}10^2$ on BHI agar and $40{\times}10$ on MacConkey agar. There was no difference according to gender. In Gram stain result, Gram(+) Cocci showed the highest frequency. Also in BHI agar plates, Micrococcus spp and Acinetobacter baumannii identified with high frequency. Moreover, S. aureus, which is very well known as strong food poisoning bacteria, was isolated. Klebsiella pneumonia ssp pneumonia was isolated with the highest frequency from the MacConkey agar or S-S agar plate. From these results show, there are as many different microorganisms from cellular phones as from our hands. This is the first report isolating strong food poisoning bacteria in cellular phones. Since infection in hospitals have been an important issue to be aware of, it is equally necessary to investigate cell phones and products which hospital workers touch with their hands.

• 대한전자공학회논문지SD
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• 제47권3호
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• pp.35-40
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• 2010

본 논문에서는 저비용, 저전력 카메라 폰 구현을 위한 하드웨어 자원 공유가 가능한 구조의 카메라 제어 프로세서를 제안한다. 제안한 카메라 제어 프로세서의 구조는 내부에 직접 접근 경로를 내장함으로써 베이스 밴드 프로세서가 카메라 제어 프로세서의 하드웨어 자원을 직접 활용할 수 있도록 하여 베이스 밴드 프로세서의 기능 확장과 성능 향상을 도모하는데 그 목적이 있다. 또한, 제안한 구조와 결합하여 블록 단위 클럭 차단 기법을 적용하여 저전력 소비를 구현한 결과를 기술하였다. 따라서 제안한 카메라 제어 프로세서는 시스템의 하드웨어 자원 효율성을 향상시켜 저전력, 저비용 카메라 폰 시스템 구현을 가능하게 한다. 제안한 카메라 제어 프로세서는 0.18um CMOS 공정을 사용하여 제작되었으며 면적은 $3.8mm\;{\times}\;3.8mm$이다.