복통이 없었던 급성 췌장염

김재희,구민지,조재민,박은실,서지현,임재영,박찬후,우향옥,윤희상,Kim, Jae Hui,Goo, Min Ji,Cho, Jae Min,Park, Eun Sil,Seo, Ji Hyun,Lim, Jae Young,Park, Chan Hoo,Woo, Hyang Ok,Youn, Hee Shang 대한소아소화기영양학회 2005 Pediatric gastroenterology, hepatology & nutrition Vol.8 No.2

소아에서 급성 췌장염은 드문 것으로 되어 있고 췌장염의 가장 흔한 원인은 둔상인 것으로 알려져 있다. 저자들은 복통은 호소하지 않으면서 심한 복부 팽만만을 주소로 내원하여 방사선학 검사 및 복수 천자 후 급성 췌장염으로 진단한 후 수술적 치료로 호전된 환아를 경험하였다. We report a boy with acute pancreatitis without abdominal pain accompanied by hepatic hematoma and massive ascites due to unperceived trauma. The case was difficult to diagnose with image study and the level of amylase. Strong suspicion of pancreatic injury based on mechanism of injury and clinical evaluation would be required to avoid a delay in diagnosis.

대통령 연설문에 나타난 사회언어학적 의미 연구 - 페어클로의 비판적 담화분석을 중심으로 -

김재희 ( Kim Jae Hee ) 한국텍스트언어학회 2018 텍스트언어학 Vol.44 No.-

This paper examines Korean presidential speeches by looking at concealed ideology from the viewpoint of Fairclough`s Critical Discourse Analysis(CDA). To this end, I analyzed the intention behind a number of speeches, focusing on the use of various personal pronouns (we / (all of) you / you / I) in the speeches of President Moon Jae-in. For analysis of the discourse effect on vocabulary selection, I looked at the words used in the inaugural address of President Moon Jae-in and at what language means he used to communicate his intention effectively. For example, he conveyed his message through the premise, intertextuality. The value of this paper lies in presenting a concrete example of critical discourse analysis by analyzing the text of political speeches by President Moon Jae-in based on Fairclough`s technique.

휴대폰 몸체 전류 변화를 이용한 안테나 특성 연구

김재희,박세현,김영일,박위상,Kim, Jae-Hee,Park, Se-Hyun,Kim, Young-Eil,Park, Wee-Sang 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.2

휴대폰 몸체 전류 변화를 이용하여 PIFA의 방사 패턴을 변화시키고, 휴대폰용 모노폴 안테나의 대역폭을 증가시키는 방법을 소개한다. 방사 패턴 변화를 위하여 후엽을 억제하는 변형된 접지면 구조를 제안하였으며, 그 결과 변형하기 전보다 0.5 dB의 이득 향상을 가져왔다. 대역폭 증가를 위하여 모노폴 안테나에 두 개의 공진 주파수를 형성시키도록 평행한 두 개의 기생 도체선을 추가하는 방법을 제안하였다. 대역폭은 341 MHz로 기존의 모노폴 안테나 구조보다 2배 이상 향상되었다. We present two effects of the case currents of a mobile phone on changing the radiation pattern of a PIFA and on enhancing the bandwidth of the monopole antenna. In order to change the radiation pattern, a modification of the ground plane is suggested to suppress the back radiation. The resulting gain is higher than that of a conventional PIFA by 0.5 dB. For enhancing the bandwidth, two parasitic metallic lines are added in the direction orthogonal to the monopole to induce double resonances. The impedance bandwidth of the proposed structure is 341 MHz, which is nearly twice of that of the conventional monopole.

군집분석 비교 및 한우 관능평가데이터 군집화

김재희,고윤실,Kim, Jae-Hee,Ko, Yoon-Sil 한국통계학회 2009 응용통계연구 Vol.22 No.4

자발적인 군집을 유도하는 다변량 통계기법으로 널리 사용되는 군집분석은 데이터에 기반한 탐색적 방법으로 쓰이며 군집원칙에 따라 여러 가지 방법이 제안되어 왔다. 또한 군집화된 결과에 대하여 유효성을 측정하는 측도도 다양한방법이 개발되었다. 본 연구에서는 계층적 군집분석 방법으로 최장연결법과 Ward의 방법, 비계층적 군집분석 방법으로 K-평균법 그리고 확률분포정보를 활용한 모형기반 군집분석방법을 이용하여 모의실험으로 군집분석을 실시하고 군집유효성 측도로는 연결성, Dunn 지수, 실루엣을 구하여 각 군집방법에 대해 유효성을 비교한다. 또한, 한우 관능평가 데이터에 군집분석을 적용하여 최적의 군집 상황을 구하고자 한다. Cluster analysis is the automated search for groups of related observations in a data set. To group the observations into clusters many techniques has been proposed, and a variety measures aimed at validating the results of a cluster analysis have been suggested. In this paper, we compare complete linkage, Ward's method, K-means and model-based clustering and compute validity measures such as connectivity, Dunn Index and silhouette with simulated data from multivariate distributions. We also select a clustering algorithm and determine the number of clusters of Korean consumers based on Korean consumers' palatability scores for Hanwoo bull in BBQ cooking method.

위치모수 변화 모형에서 순위함수와 평균함수를 이용한 비모수적 변화점 추정

김재희,이경원,Kim, Jae-Hee,Lee, Kyoung-Won 한국데이터정보과학회 2000 한국데이터정보과학회지 Vol.11 No.2

위치 모수에 대해 1개의 변화점이 있는 경우 Carlstein(1988)의 변화점 추정량을 순위함수와 평균함수를 이용하여 변형시킨 변화점 추정통계량을 제안하였다. 모의 실험을 통해 Carlstein(1988) 변화점 추정량과 제안하는 변화점 추정량의 평균, 평균제곱오차와 변화점 추정비율을 계산하여 비교하였다. This article suggests two change-point estimators which are modifications of Carlstein(1988) change-point estimators with rank functions and mean functions where there is one change-point in a mean function. A comparison study of Carlstein(1988) estimators and proposed estimators is done by simulation on the mean, the MSE, and the proportion of matching true change-point.

한우 맛 등급 판별방법 비교 연구

김재희,서그러운달님,Kim, Jae-Hee,Seo, Gu-Re-Oun-Den-Nim 한국통계학회 2008 응용통계연구 Vol.21 No.6

본 연구에서는 한우의 연도, 다즙성, 향미, 전반적인 기호도에 관한 소비자 관능평가 데이터를 기반으로 소비자 맛 등급을 판별하는 방법을 비교 연구하였다. 판별방법으로는 선형판별, 이차판별, 정준판별, 비모수적 판별방법을 사용하였고, 재대입 방법에 의한 분류율을 측정하여 판별방법들의 분류능력을 비교하였다. This paper presents the comparison of four methods, linear, quadratic, canonical and non-parametric discriminant analyses to discriminate the consumers' taste grade with sensory variables, such as tenderness, juiciness, flavor, and overall acceptability based on Consumer Sensory Survey. The classification ability of each method is measured and compared by the resubstitution error rate.

Comparison of Change-point Estimators with Scores

김재희,서현주,Kim, Jae-Hee,Seo, Hyun-Joo 한국데이터정보과학회 2002 한국데이터정보과학회지 Vol.13 No.1

We consider the problem of estimating the change-point in mean change model with the one change-point. Lombard (1987) suggested change-point estimation based on score functions. Gombay and Huskova (1998) derived a class of change-point estimators with the score function of rank. Various change-point estimators with the log score functions of ranks are suggested and compared via simulation.

해외 CM사업의 애로요인 분석에 관한 연구

김재희,김한수,Kim, Jae-Hee,Kim, Han Soo 한국건설관리학회 2013 한국건설관리학회 논문집 Vol.14 No.5

CM기업의 해외진출이 중요한 화두가 되고 있는 현 시점에서, 본 연구는 CM기업이 해외 CM사업에서 겪는 애로요인(어려움)을 도출하고 이들 애로요인에서 나타나는 주요 특징과 시사점을 분석하기 위한 목적으로 수행되었다. 해외 CM사업 경험이 있는 CM전문가들을 대상으로 설문조사와 인터뷰조사를 실시하여 해외 CM사업의 5개 애로요인군(群)과 25개 애로요인에 대한 분석을 실시하였다. 그 결과, 해외 CM사업에는 다양한 유형의 애로요인들이 존재하지만 각 애로요인에는 경중(輕重)이 있으며, CM기업들이 우선적으로 주목하고 대비해야할 소수의 애로요인이 있는 것으로 나타났다. 또한, CM기업이 해외 CM사업에서 겪는 어려움을 최소화하기 위해 해결해야 할 가장 중요한 현안은 CM전문가 양성 및 확보를 통한 시공이전단계 사업관리역량 강화인 것으로 나타났다. An expansion into the global market increasingly becomes a buzz world among Construction Management(CM) firms in Korea. The objective of this study is to identify potential obstacles and investigate their nature and implications to CM firms in Korea. The study identified 25 obstacles under 5 categories. Base on a questionnaire survey and interviews with CM experts who have global CM projects experience, the study discusses that while there exist various types of obstacles, a more attention needs to be paid for a small number of major obstacles to minimine risks in overseas CM projects. It also suggests that improving pre-construction management competency through securing CM experts should be listed as a top agenda for Korean CM firms.

청소년 대사증후군과 관련요인 : 1998~2008년도 국민건강영양조사

김재희,이경란,정종운,Kim, Jae-Hee,Lee, Gyeong-Ran,Chong, Chung-Un 대한예방한의학회 2011 대한예방한의학회지 Vol.15 No.1

Objectives : The aim of this study was to investigate the prevalence of metabolic syndrome and the association between lifestyle factors and the risk of metabolic syndrome in Korean adolescents. Methods : The metabolic syndrome was defined with ${\geq}$ 3 metabolic abnormalities using the age-modified criteria of the Adult Treatment panel III specified by National Cholesterol Education Program in adolescents aged 12 to 18 years who have participated in the Kroean National Health and Nutrition Examination Survey in 1998(n=936) and 2008(n=620). Physical activity and dietary intakes were assessed. Results : The overall prevalence of metabolic syndrome in Korean adolescents declined over 10 years (P < 0.01). Adolescents engaging regular exercise significantly increased over 10 years (P < 0.001). Physically activity was associated with a lower risk of metabolic syndrome (P < 0.001). Dietary intake patterns were not associated with a risk of metabolic syndrome. Conclusions : The prevalence of metabolic syndrome among Korean adolescents declined over 10 years which may be in part due to the increased regular physical activity. The risk of metabolic syndrome is lower in individuals who are physically active.

나노 질화규소 세라믹스의 내마모 특성

김재희,김원식,홍성현,Kim, Jae-Hee,Kumar B, Venkata Manoj,Kim, Won-Sik,Hong, Seong-Hyeon 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.5

In this study, bulk nano-crystalline $Si_3N_4$ ceramics were fabricated by spark plasma sintering (SPS) and their mechanical properties, in particular wear, were investigated. A wide range of grain sizes, from 80 nm and 250 nm were obtained by varying sintering conditions ($1550^{\circ}C$-5 min to $1650^{\circ}C$-20 min). The elastic modulus of obtained ceramics was ${\sim}250$ GPa and hardness was in the range of $13{\sim}14$ GPa. The indentation fracture toughness increased from $2.58MPa{\cdot}m^{1/2}$ to $3.24MPa{\cdot}m^{1/2}$ with increasing sintering temperature possibly due to the elongated grains. Sliding wear tests revealed at least an order magnitude improvement in wear resistance with grain refinement. Microstructure analysis indicated that nano-$Si_3N_4$ specimens worn mainly through delamination and microcracking, while that of coarser specimens revealed severe wear with grain debonding and fracture.