• 한국식품영양학회지
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• 제30권2호
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• pp.297-304
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• 2017

Although adolescents' obesity prevalence increases recently in Korea due to Westernized dietary life, according to social and economic development, and physical activity decline, distorted body image and improper dietary habits are prevalent, because of excessive obsession with weight control, deriving from psychological impacts including appearance supremacy. This study conducted a survey on health oriented awareness and attitude related with dietary habits targeting adolescents, such as high school students and college students, younger than 24, from May 11 to May 29, 2015. In this study, 280 questionnaire copies were collected out of 300 distributed questionnaire copies, and used 269 copies as analysis data, except 11 copies of which responses were inadequate. The results of this study are as follows: First, the high school students showed higher dietary regularity than the college students. Especially, 95.5% of the college students showed very high irregularity of lunch, compared with just 4.5% of the high school students. Second, the adolescents showed distorted perceived body image in comparison with body mass index (BMI). As a result of examining BMI relationship, according to one's own perception on body type, 28.6% of the respondents perceived themselves fat, despite normal BMI, and 40.4% of the respondents perceived themselves normal, despite low BMI. Third, health behavior activities level was higher, as the regularity of breakfast (B=1.093), lunch, (B=0.650), and dinner (B=0.765) was higher. The variable affecting the most ( ${\beta}=0.372$) was the regularity of breakfast. As interest in weight control was higher, health behavior activities was lower. Because over-interest in weight control may be linked with improper dietary habits or weight control, a caution is needed. The results of this study are expected to be utilized as the basic data for the policy and health-oriented program development to improve adolescents' health behavior practice.

• 한국통신학회논문지
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• 제36권7B호
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• pp.834-840
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• 2011

현대사회에서 만성질환은 고령인구의 건강한 삶을 위협하는 요소이며 당뇨 및 고혈압은 신장 기능의 파괴를 초래하고 악화될 경우 혈액투석, 인공장기, 장기이식술 등의 치료를 받아야 하는 위험한 질환이다. 따라서 본 논문에서는 당뇨 및 고혈압 환자들을 대상으로 혈액투석 치료에 따른 성대 진동 요소의 변화를 측정하여 혈액투석 치료가 성대 진동에 미치는 영향을 연구하였다. 이를 위해 발음에 문제가 없는 당뇨 및 고혈압 환자들을 피실험자로 선정하고 이들의 혈액투석 전과 후의 음성을 수집하여 성대 진동과 관련된 Jitter 및 Shimmer 분석 요소를 적용하여 변화되는 정도를 비교, 분석하는 실험을 수행하였다. 결론적으로 당뇨 및 고혈압 환자를 대상으로 한 혈액 투석 치료가 신장 기능의 향상에 도움이 되는 것을 성대 진동의 안정성이 향상되는 실험 결과로 도출하였다.

• 음성과학
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• 제13권1호
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• pp.55-66
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• 2006

A purpose of this study is to investigate the acoustic characteristics of English stress produced by the two groups of South Kyungsang (henceforth, SK) Korean speakers: high-proficiency and low-proficiency with reference to English native speakers. Another purpose is to compare results from the high- and low-proficiency SK Korean subjects with those of the native speakers, and to provide an analytical account of how approximate the high-proficiency SK Korean subjects' production is to the native speakers' and how different the low-proficiency SK Korean subjects' is from the native speakers'. Results indicated that the native speakers' main strategy used in producing stressed syllables was duration while the high-proficiency SK Korean subjects' was predominantly pitch-oriented. The low-proficiency SK Korean subjects' pitch patterns showed regularity, emphasizing the penultimate syllable with pitch. In comparing duration among the three groups, both groups of the SK Korean subjects became more even in their duration values for each syllable as the structure of the word or the sentence became more complex.

• 여성건강간호학회지
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• 제12권4호
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• pp.363-370
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• 2006

Purpose: The aim of this study was to analyze breast cancer screening behaviors in working women. Method: A total of 354 women over 20 years of age were recruited from three major occupational settings by convenience sampling. The Champion's Health Beliefs Model Scale-Korean version and a structured questionnaire for measuring regularity and accuracy of breast self-examination(BSE) were used. Data were analyzed using descriptive statistics, $x^$-test, ANOVA, and Duncan post hoc tests. Result: Women who have performed BSE and had both BSE and clinical tests were 49.2% and 32.8%, respectively, while 36.7% of the participants had none of the screening. The screening patterns were significantly different by individual characteristics of age, occupation, experiences of breast disease, education at workplace, and by the level of confidence in health beliefs (p<.01, p<.05). Only 4 % of women performed BSE regularly and the level of accuracy of the BSE was very low as well. Conclusion: Education at the workplace needs to emphasize the recommended guidelines and further increase the quality and results of the BSE for women's health.

• 한국운동역학회지
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• 제32권4호
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• pp.121-127
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• 2022

Objective: The purpose of this study was to investigate potential effects of transcranial direct current stimulation (tDCS) on bimanual force control capabilities in healthy young adults. Method: Eighteen right-handed healthy young adults (10 females and 8 males; age: 23.55 ± 3.56 yrs) participated in this crossover design study. All participants were randomly allocated to both active-tDCS and sham-tDCS conditions, respectively. While receiving 20 min of active- or sham-tDCS interventions, all participants performed bimanual isometric force control tasks at four submaximal targeted force levels (i.e., 5%, 10%, 15, and 20% of maximal voluntary contraction: MVC). To compare bimanual force control capabilities including force accuracy, variability, and regularity between active-tDCS and sham-tDCS conditions, we conducted two-way repeated measures ANOVAs (2 × 4; tDCS condition × Force levels). Results: We found no significant difference in baseline MVC between active-tDCS and sham-tDCS conditions. Moreover, our findings revealed that providing bilateral tDCS including anodal tDCS on left primary motor cortex (M1) and cathodal on right M1 while conducting bimanual force control trials significantly decreased force variability and regularity at 5%MVC. Conclusion: These findings suggest that providing bilateral tDCS on M1 areas may improve bimanual force control capabilities at a relatively low targeted force level.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제21권4호
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• pp.203-214
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• 2017

In this paper we propose and analyze two a posteriori error estimators for the stabilized $P_1/P_1$ finite element discretization of the Stokes equations. These error estimators are computed by solving local Poisson or Stokes problems on elements of the underlying triangulation. We establish their asymptotic exactness with respect to the velocity error under certain conditions on the triangulation and the regularity of the exact solution.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권12호
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• pp.3366-3383
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• 2012

Reliance on the Internet has introduced Voice over Internet Protocol (VoIP) to various security threats. A reliable security protocol and an authentication scheme are thus required to prevent the aforementioned threats. However, an authentication scheme often demands additional cost and effort. Accordingly, a security framework for known participants in VoIP communication is proposed in this paper. The framework is known as Randomness-Optimized Self-Securing (ROSS), which performs authentication automatically throughout the session by optimizing the uniqueness and randomness of the communication itself. Elliptic Curve Diffie-Hellman (ECDH) key exchange and Salsa20 stream cipher are utilized in the framework correspondingly to secure the key agreement and the communication with low computational cost. Human intelligence supports ROSS authentication process to ensure participant authenticity and communication regularity. The results show that with marginal overhead, the proposed framework is able to secure VoIP communication by performing reliable authentication.

• 디지털융복합연구
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• 제11권11호
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• pp.705-715
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• 2013

본 연구는 유아기질이 유아의 자아존중감, 또래유능감에 어떠한 영향을 미치는 지를 살펴봄으로써 유아의 자아존중감과 또래유능감을 향상시킬 수 있는 방법을 제안하는 데 목적이 있다. 분석을 통해 나타난 연구의 주요 결과는 다음과 같다. 첫째, 유아기질의 적응성, 활동성, 자아존중감의 인지적능력, 동료수용의 경우 어린이집의 평점이 더 높은 것으로 나타났으며, 유아기질의 반응성, 자아존중감의 어머니수용, 동료관계, 또래유능성의 사교성은 유치원의 평점이 더 높은 것으로 조사되었고, 남아의 '생리적규칙성'이 여아에 비해 더 높은 것으로 조사되었다. 둘째, 유아의 연령에 따른 유아기질, 자아존중감, 또래유능성의 차이를 살펴본 결과, 유아기질의 '반응성'의 경우 만 5세가 a그룹으로 만 3세, 만4세가 b그룹으로 나뉘어 차이를 보였으며 '생리적규칙성'의 경우 만3세의 규칙성이 가장 컸으며 만5세의 규칙성이 상대적으로 적어 차이를 보였다. 자아존중감과 또래유능감에서는 만4, 5세가 만3세보다 높은 것으로 확인되어졌다.

• 대한전자공학회논문지SD
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• 제40권6호
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• pp.459-468
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• 2003

본 논문에서는 차수 연산이 필요 없는 새로운 DCME 알고리즘 (Degree Computationless Modified Euclid´s Algorithm)을 사용한 저비용 고속 RS (Reed-Solomon) 복호기를 제안한다. 제안하는 구조는 차수 연산 및 비교 회로가 필요 없어 기존 수정 유클리드 구조들에 비해 매우 낮은 하드웨어 복잡도를 갖는다. 시스톨릭 에레이 (systolic array)를 이용한 제안하는 구조는 키 방정식 (key equation) 연산을 위해서 초기 지연 없이 2t 클록 사이클만을 필요로 한다. 또한, 3t＋2개의 기본 셀 (basic cell)을 사용하는 DCME 구조는 오직 하나의 PE (processing element)를 사용하므로 규칙성 (regularity) 및 비례성(scalability)을 갖는다. 0.25㎛ Faraday 라이브러리를 사용하여 논리합성을 수행한 RS 복호기는 200㎒의 동작 주파수 및 1.6Gbps의 데이터 처리 속도를 갖는다. (255, 239, 8) RS 코드 복호를 수행하는 DCME 구조와 전체 RS 복호기의 게이트 수는 각각 21,760개와 42,213개이다. 제안하는 RS 복호기는 기존 RS 복호기들에 비해 23%의 게이트 수 절감 및 전체 지연 시간의 10%가 향상되었다.

• 디지털산업정보학회논문지
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• 제18권1호
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• pp.1-9
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• 2022

Galois field arithmetic is important in error correcting codes and public-key cryptography schemes. Hardware realization of these schemes requires an efficient implementation of Galois field arithmetic operations. Multiplication is the main finite field operation and designing efficient multiplier can clearly affect the performance of compute-intensive applications. Diverse algorithms and hardware architectures are presented in the literature for hardware realization of Galois field multiplication to acquire a reduction in time and area. This paper presents a low complexity semi-systolic multiplier to facilitate parallel processing by partitioning Montgomery modular multiplication (MMM) into two independent and identical units and two-level systolic computation scheme. Analytical results indicate that the proposed multiplier achieves lower area-time (AT) complexity compared to related multipliers. Moreover, the proposed method has regularity, concurrency, and modularity, and thus is well suited for VLSI implementation. It can be applied as a core circuit for multiplication and division/exponentiation.