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무선 전파특성을 고려한 협력 위치추정 알고리즘 성능분석
정승희,오창헌,Jeong, Seung-Heui,Oh, Chang-heon 한국정보통신학회 2010 한국정보통신학회논문지 Vol.14 No.6
본 논문에서는 실내외 무선 센서네트워크 환경에서 전파특성을 고려한 수신신호세기 기반의 협력 위치추정 알고리즘을 제안하고 이에 대해 성능을 분석하였다. 기존의 수신신호세기 기반의 위치추정 기법은 장애물 등 전파환경에 따라 신호세기가 불안정하여 낮은 위치추정 신뢰도를 보였다. 이러한 불안정한 전파환경을 극복하기 위해 본 논문에서는 광선발사법을 통해 도출된 전파특성 요인을 제안하는 협력 위치추정 알고리즘에 반영하였다. 또한 협력 위치추정 알고리즘의 성능평가를 위해 4개의 가상공간에 고정위치를 알고 있는 4개의 Zigbee 노드와 위치를 알지 못하는 미지의 Zigbee 노드 5개를 배치하여 실험하였다. 실험결과, NLCA의 경우 2m-3.5m 오차를 보였으나 본 논문에서 제안하는 CLA/ECLA의 경우는 1.3m-2.5m/0.5m-1.2m로 선형적인 성능개선을 보였다. 그러므로 전파특성요인이 고려되었을 경우 기존의 수신신호세기 기반 위치추정 방식에 비해 본 논문에서 제안하는 협력위치추정 방식이 보다 효율적임을 확인하였다. In this paper, we proposed and analyzed a RSSI based cooperative localization algorithm considering wireless propagation characteristics in indoor and outdoor environments for wireless sensor networks, which can estimate the BN position. The conventional RSSI based estimation scheme has low precision ranging due to instability propagation characteristics by time variable. Hence, we implemented ray-launching simulator for analysis of propagation characteristics in 4 case, and experimented proposed localization scheme with 4 RN and 1 to 5 BN. Simulation results show that NLCA has estimation error as 2m-3.5m, however, proposed CLA/ECLA has 1.3m-2.5m/0.5m-1.2m by same environments. Therefore, if we can consider channel characteristics, the proposed algorithm provides higher localization accuracy than RSSI based conventional one.
한국의 B형간염 표면항원 양성률의 변화, 1998-2005
정승희(Seunghee Jeong),임현우(Hyeon Woo Yim),배시현(Si Hyun Bae),이원철(Won Chul Lee) 한국역학회 2008 Epidemiology and Health Vol.30 No.1
Purpose: The purpose of this study was to investigate the prevalence rate of HBsAg and the epidemiological characteristics of hepatitis B virus (HBV) infection from 1998 to 2005. National Health and Nutrition Examination Survey (NHANES) data of 1998, 2001 and 2005 were analyzed. Method: Study population was consisted of 24,093, aged 10 year or over who performed NHANES self reported surveys and blood tests. Statistical analysis was performed by age, sex, and the year of survey. Also the prevalence of HBsAg was compared by self reported family history of liver disease. Results: The prevalence rate of HBsAg was reduced from 4.5% in 1998 to 3.7% in 2005. Also age-specific prevalence rate of HBsAg was significantly decreased in persons born after introduction of the hepatitis B virus vaccination. HBsAg seropositivity was slightly higher in male than in female Among the people with the family history of liver diseases, the risk of HBsAg seropositive was much higher than those without. Study subjects with mother"s liver disease history showed much higher HBsAg serepositive rate. Although after the implementation of hepatitis B virus vaccination program prevalence of HBsAg decreased, but persons with history of liver disease showed still higher rate Of HBsAg seropositive rate. Conclusion: Although the introduction of the HBV vaccination program has resulted in a decline of HBV infection, the family history of liver diseases was still an important factor for transmission of HBV in Korea. In addition to the mother-to-child transmission prevention program from 2002, it might be advisable to introduce a screening program for persons with family history of liver diseases for further reduction of HBV infection.
정승희(Seunghee Jeong),임현우(Hyeon Woo Yim),정영은(Youngeun Jung),조선진(Sunjin Jo),전태연(Taeyoun Jun),정성원(SungWon Jung),이민수(Minsoo Lee),김재민(Jaemin Kim) 한국역학회 2008 Epidemiology and Health Vol.30 No.2
Purpose: People with a family history of mood disorder are more likely to have depression. This study compared the characteristics of non-psychotic major depression disorder according to family history of depression. Method: Subjects were total of 817 persons recruited for the CRESCEND-K multicenter trial. Characteristics of depression and suicide history of patients with and without a family history of depression were assessed. Family history was determined through self-report. Results: Of 817 participants, 12.4% had a positive family history of depression. Those with family history of depression reported an earlier age at onset of MDD, and more psychiatric comorbidity. Severity of depression and anxiety were not different according to family history of depression. There were no difference in attempted suicide history, number of attempted suicide and age at onset of 1st attempted suicide according to such a family history. Conclusion: Patients with family history of depression reported earlier onset of MDD and more history of psychiatric comorbidity.
현대 패션과 헤어디자인에 표현된 맥시멀리즘에 관한 연구 -2000년대 패션쇼를 중심으로-
정승희 ( Seung Hee Jeong ) 한국미용학회 2011 한국미용학회지 Vol.17 No.5
The discussion on Maximalism, which is the source of creative inspiration in design, had begun in the literature of 1980s. In the formative art, Maximalism can be seen in architecture and design. Maximalism gave impacts on fashion and hair design as a culture style of the time. To modern people who want creative and unique design, Maximalism can be a motif, with which modern people can experience more novel design. This study will explore the bold attempts, various materials, design inspirations, free expressive characteristics and formative aspects of Maximalism as expressed in the fashion and hair design of fashion shows based on the theoretical examination as following. First, the concept and creation background of Maximalism will be reviewed. Second, a classified framework from the perspective of expression type will be established by reviewing the formative characteristics of Maximalism as expressed in fashion and hair design. Third, the structural similarity and interdependency of Maximalism expressed in modern fashion and hair design will be compared and analyzed based on the established framework. The significance of this study is in the maximization of fashion and hair design values as Total Fashion Beauty and formative arts with endless possibility in the artistic expression field.Maximalism has its formative role with fashion and hair as one of important formative elements making them escape from the existing fixed idea and awareness.
보문 : 패션컬렉션에 나타난 한, 중, 일의 에스닉 이미지 표현특징 연구
정승희 ( Seung Hee Jeong ),최은미 ( Eun Mi Choi ) 대한미용학회(구 대한미용과학회) 2013 대한미용학회지 Vol.9 No.2
The interest in ethnic image is kind of a cultural code which is reconfigured in totally different image through the process of integrating and compromising with other cultures in different pattern for continuous development. Ethnic image has been developed to the interest in foreign cultures by the study on fashion and beauty design. This study based on such fact is intended to analyze the characteristic of Korean, Chinese and Japanese ethnic image fashion appeared in2000`s fashion collection. Consequently, the result is outlines as follows. In “Korean Style”, narrow eyebrow, pinky lip and rouge, natural skin makeup and a round chignon by parting were expressed, and in fashion, skirt of Hanbok or sparing the Jeogori line were expressed with obangsek, in a way of compromising with the contemporary image. In“Japanese Style”, white skin was represented in a matt finish and Gabuki makeup was expressed using pinky lip and eye line in blue and black or Samurai hair style was modified or expressed in hagok or hyunggok of classical style. In fashion, silhouette of Kimono was exaggerated or splendor of traditional colors and obi were modified to stress the humorous elements. In “Chinese Style”, patches were attached using various colors, instead of black eyebrow or eye shadow, and using makeup technique of Peking opera. The hair was gallantly expressed by adding decoration and in fashion, it was ornately expressed using tight silhouette of qipao or Mandarin color.