• 한국전자통신학회논문지
• /
• 제15권1호
• /
• pp.21-30
• /
• 2020

본 논문에서는 국제전기통신연합에서 권고하는 경로손실 예측모델을 이용하여 지상통제소와 무인 항공기 사이의 공대지 채널에 대한 경로손실을 예측하고, 이를 공대공 채널로 확장하여 중고도급 무인 항공기를 기반으로 하는 공중중계 시스템에 대한 네트워크 커버리지를 분석한다. 대기에 의한 경로손실 예측을 위해 한반도의 기후 및 지리적 인자를 활용하였다. 특히 국내의 강우량 및 유효지구반경 인자는 한국정보통신기술협회에서 공시한 실측 데이터를 활용하여 정확도를 높였다. 또한, 공중중계 송수신기는 현재 국내에서 개발 완료된 공용데이터링크 시스템의 주요지표를 활용하였다. 예측 결과로부터 임무 고도가 높아질수록 공중중계 시스템의 네트워크 커버리지가 넓어짐을 확인하였다.

• Asian Pacific Journal of Cancer Prevention
• /
• 제16권16호
• /
• pp.7189-7193
• /
• 2015

Background: Cancer is a leading cause of death throughout the world. Increasing life expectancy and aging population are important factors for increasing cancer incidences in developing countries. National programs are essential for prevention and control of cancer in any society. This study aimed to investigate cancer epidemiology and trends in the province of Hamadan, located in Northwest Iran. Materials and Methods: This analytical study was carried out based on cancer registry data from 2004 to 2009 in the province of Hamadan, analyzed using STATA (version 12) software for descriptive tests and Join point 4.1.1.1 software for analytical tests. Results: There were 7,767 registered cases of cancer during the 6 years studied. Of the total cases registered, 59.1% (4,592 cases) involved men and 40.9% (3,175 cases) occurred in women. Age-standardized incidence rates (ASR) increased from 72.9 to 132.0 in males and 48.2 to 115.0 in females during the 6 years of the study (p<0.001). The most common cancers were skin, stomach, breast, bladder, and leukemia. In women, teh most common were breast, skin, stomach, colorectal, and leukemia, in that order, and in men skin, stomach, bladder, leukemia, and prostate cancers. Conclusions: The cancer incidence is greater in men that women in this region but with increasing trends in both sexes. Planning regarding education in prevention of exposure to risk factors and control strategies is required to decrease the incident cases. Screening programs for common cancers in older age groups might be helpful to reduce the disease impact.

• 응용통계연구
• /
• 제33권4호
• /
• pp.365-377
• /
• 2020

선형모형에서 두개 이상의 설명변수들 사이에 존재하는 다중공선성 문제를 변수들 간에 내재되어 있는 공통의 구조인 인자를 구성하고, 인자들을 회귀변수로 사용하여 해결하는 인자회귀모형에 대하여 논의한다. 무한개로 가정 가능한 내재된 인자 중 유의미한 인자적재행렬을 구성하기 위하여 벌점모수의 값이 큰 LASSO 사전분포를 적용하는 베이지안 추정법을 사용한다. 결정된 인자적재행렬과 다른 모수들의 추정값을 각 설명변수의 선형모수로 역변환 하여, 새로운 관측값에 대한 예측 모형으로도 사용한다. 제안한 방법을 제품 서비스 관리 자료에 적용하여 정해진 인자의 개수에 대한 인자가 일반적인 공통인자회귀모형과 동일한 결과를 나타냄을 확인하였고, 일반적인 공통인자회귀모형과 비교를 위해 계산한 평균 제곱 오차값이 더 작다는 것을 알 수 있었다.

• Journal of Trauma and Injury
• /
• 제28권3호
• /
• pp.129-133
• /
• 2015

Purpose: The purpose of this study is to evaluate the surgical outcome of duodenal injuries and to analyze the risk factors related to the leakage after surgical treatment. Methods: A retrospective review of 31 patients with duodenal injuries who managed by surgical treatment was conducted from December 2000 to May 2014. The demographic characteristics, injury mechanism, site of duodenal injury, association of intraabdominal organ injuries, injury severity score (ISS), abdominal abbreviated injury scale (AIS), injury-operation time lag, surgical treatment methods, complications, and mortality were reviewed. Results: Duodenal injury was more common in male. Twenty four (77.4%) patients were injured by blunt trauma. The most common injury site was in the second portion of the duodenum (n=19, 58.6%). Fourteen patients (45.2%) had other associated intraabdominal organ injuries. The mean ISS is $13.6{\pm}9.6$. The mean AIS is $8.9{\pm}6.5$. Eighteen patients (58.1%) were treated by primary closure. The remaining 13 patients underwent various operations, including exploratory laparotomy (n=4), pancreaticoduodenectomy (n=3), pyloric exclusion (n=3), Resection with end-to-end anastomosis (n=2), and duodenojejunostomy (n=1). Most common postoperative complications were intraabdominal abscess (n=9) and renal failure (n=9). Mortality rate was 9.7%. Conclusion: ISS, AIS>10, operative time, pancreaticoduodenectomy, sepsis, and renal failure are significant predictors of a postoperative leak after duodenal injury. Careful management is needed to prevent a potential leak in patient with these findings.

• Asian Pacific Journal of Cancer Prevention
• /
• 제15권1호
• /
• pp.151-154
• /
• 2014

Background: Lung cancer is the most common cause of cancer-related death worldwide. The incidence of lung cancer is aproximately 7-8 thousand percent in Turkish women. In this study, we aimed to evaluate the clinical, pathological properties and survival data of female patients with lung cancer who were treated in our center. Materials and Methods: From 2007 to 2012, 50 women with lung cancer were enrolled. Patient data were evaluated retrospectively. Results: The median age was 61 (40-81). Forty patients (80%) were diagnosed with non small cell lung cancer (NSCLC), 10 patients (20%) were small cell carcinoma (SCC). Twelve (24%) patients were smokers and 13 of 16 non-smokers had a history of exposure to asbestos. The most common histologic subtype was adenocarcinoma (46%) and this accounted for 71% in patients with exposure to asbestos. The most common initial Eastern Cooperative Oncology Group (ECOG) performance score was 1 (24 patients, 48%) and initial stage was IV (25 patients, 50%) in the study group. During the median 15 months (1-96 months) followup period: 1 year overall survival (OS) was 68%, 2year overall survival was 36% and the median survival time was 19 months. According to univariate analysis, poor ECOG performance status, advanced stage, anemia and weight loss at time of diagnosis were negative prognostic factors. However, adenocarcinoma sub-type was a positive prognostic factor. Conclusions: In this study NSCLC sub-type, poor ECOG performance score, advanced stage, anemia and weight loss were prognostic factors in Turkish women with lung cancer.

• Asian Pacific Journal of Cancer Prevention
• /
• 제13권8호
• /
• pp.3949-3953
• /
• 2012

Head and neck cancers are amongst the commonest malignancies, accounting for approximately 20% of the cancer burden in India. The major risk factors are tobacco chewing, smoking and alcohol consumption, which are all preventable. This retrospective study presents data from the histopathology register for a five year period from 2002-2006 at Patna Medical College and Hospital, a tertiary care hospital drawing patients from the entire Bihar state, the 3rd most populous state of India with the majority of the population residing in rural areas. Incidence rates based on sex, age, site of lesion, including age standardized incidence rates for males and females, with mean age of presentation, distribution of histological variants and year wise trend were calculated. Out of 455 head and neck neoplasias, 241 were benign while 214 were malignant. The most common age group for all malignant biopsies was 7th decade for males and the 5th decade for females. Malignant cases were commoner in males than females with the male:female ratio of 3.1:1, which was found to be statistically significant by the chi-square (${\chi}^2$) test. The crude rate and age standardized incidence rate was 0.05 and 0.06 per 100,000 population respectively. Squamous cell carcinoma (SCC) contributed about 96% of all cases, with grade I being the most common. Larynx was the most common site for malignancy, the supraglottic region being its most commonly affected sub-site. This observed incidence patterns in the region are a reminder of widespread unawareness, low healthcare utilization with virtually non-existent cancer programs. It also underlines the need to advocate for reliable cost-effective programs to create awareness, for early detection and plan appropriate management strategies. There is a compelling demand for a cancer registry in this region as well as proper implementation of preventive measures to combat this growing threat of cancer, many of whose risk factors are preventable.

• Asian Pacific Journal of Cancer Prevention
• /
• 제14권10호
• /
• pp.6035-6040
• /
• 2013

Background: Cancer is a complex disease caused by multiple factors, both genetic and environmental. It is a major health concern worldwide, in the Middle East and in Jordan specifically and the fourth most common killer in the Middle East. Hypothesis: The relative genetic homogeneity of the Circassian and Chechan populations in Jordan results in incidences of cancer that differ from the general Jordanian population, who are mostly Arabs. Materials and Methods: National Cancer Registry data were obtained for the years 1996-2005 The Chechen and Circassian cancer cases were identified and cancer registry data were divided into three populations. Crude rates were calculated based on the number of cancer cases and estimated populations. Results: Breast cancer is the most common cancer type constituting about one third of female cancers in all three populations. Higher crude rates are observed in the Circassian and Chechen populations than in the Arab Jordanian population. The rate ratios (95%CI) in Circassians and Chechens with respect to the Arab Jordanian population are 2.1 (1.48, 2.72) and 1.81 (1.16, 2.85), respectively. Lung cancer is the most common cancer in male Arab Jordanians and Chechens with crude rates of 4.2 and 8.0 per 100,000 respectively. The male to female ratio in these two populations in respective order are 5:1 and 7:1. The lung cancer crude rate in Circassians is 6.5 per 100,000 with a male to female ratio of only 1.6:1. The colorectal cancer crude rates in Arab Jordanians and Chechens are similar at 6.2 and 6.0 per 100,000, respectively, while that in Circassians is twice as high. Conclusions: Considerable ethnic variation exists for cancer incidence rates in Jordan. The included inbred and selected populations offer an ideal situation for investigating genetic factors involved in various cancer types.

• 대한본초학회지
• /
• 제35권1호
• /
• pp.1-8
• /
• 2020

Objectives : This study was conducted to evaluate the effects of Corni Fructus, the dried fruits of Cornus officinalis Sieb., on unilateral common carotid artery occlusion (UCCAO) in mouse model. Methods : The Corni Fructus used in the experiment was extracted with anhydrous methanol, then filtered and freeze-dried. C57BL/6 mice used in the experiments were conducted left UCCAO surgery to set up UCCAO rodent model for mice. The mice were divided into five groups for evaluate the effect of methanol extract of Corni Fructus (COM) on UCCAO induced ischemic brain injury. The expression levels of nitric oxide in cerebrum and serum, body weight change were measured. To determine the effect of UCCAO and COM administration on brain neurons, morphological changes of the cerebrum through a microscope was conducted. And western blot was performed to confirm the underlying mechanism of neuroprotective effect of COM administration. Results : COM administered UCCAO groups (CO50, CO150, and CO500) had no significant effects on nitric oxide production in ipsilateral hemisphere proteins and sera. The CO500, 500 mg/kg COM administration, attenuated UCCAO-induced p38 inflammatory signaling pathway and inflammatory mediators such as iNOS and COX-2. The CO500 group showed resilient morphological changes of hippocampus neuronal cells about brain damage caused by decreased flow of blood. These group also showed decreased inflammation and cellular stress response in neuronal cells. Conclusions : From these results, COM has a neuroprotective property via moderating inflammatory factors and cellular stress inducing factors in brain cells.

• 한국사회복지학
• /
• 제57권3호
• /
• pp.195-222
• /
• 2005

본 연구는 청소년 인터넷 중독의 각 유형에 따른 비교분석에 초점을 두고, 인터넷 중독유형에 대한 위험요인과 보호요인의 상대적 영향력을 확인하며, 중독유형간의 공통적 요인과 상이한 요인을 밝혀보고자 하였다. 또한 인터넷 중독유형이 정신건강에 미치는 영향을 파악하였다. 1,830명의 청소년들을 대상으로 한 연구결과는 첫째, 청소년의 62.3%는 인터넷 중독이었고, 15.9%는 인터넷 게임중독, 10.9%는 인터넷 섹스중독으로 나타났다. 둘째, 모든 인터넷 중독유형에서 위험요인이 보호요인보다 더 높은 영향력을 나타냈으며, 보호요인의 보상효과는 인터넷 중독과 게임중독에서는 나타났으나, 섹스중독에서는 나타나지 않았다. 셋째, 인터넷 중독유형에서의 공통적인 위험요인은 우울, 공격성, 부모 통제, 친구 영향력이었고, 보호요인은 자기통제력 이었다. 상이한 위험요인은 PC접근성이었고, 보호요인은 자기효능감, 교사지지, 친구지지, 부부관계로 나타났다. 넷째, 3개 중독유형 모두에서 일반이용집단보다 중독집단이 더 높은 수준의 정신과적 증상을 경험하는 나타났다. 다섯째, 3개 중독유형 중 섹스중독, 게임중독, 인터넷 중독 순으로 정신과적 증상차원에 높은 부정적 영향을 미치는 것으로 나타났으며, 중독의 정도가 높을수록 정신과적 증상이 심해지는 것으로 나타났다.

• 산학경영연구
• /
• 제11권
• /
• pp.83-100
• /
• 1998

이 연구는 ${\ulcorner}$부서간 협력이 신제품 개발성과에 미치는 영향에 관한 이론적 모형${\lrcorner}$을 구축하는데 목적을 두고 있다. 이 연구에서 부서간 협력의 핵심요인으로는 ${\ulcorner}$구조적 요인${\lrcorner}$과 ${\ulcorner}$하부 구조적 요인${\lrcorner}$으로 구분되었으며, 이들 요인들이 부서간 협력의 어느 요소에 영향을 미치며, 나아가 신제품개발성과의 어느 분야에 영향을 미치는지를 체계화 모형화 시키는데 연구의 초점을 두었다. 부서간 협력의 ${\ulcorner}$구조적 요인${\lrcorner}$으로는 부서간 직무순환제도, 문서공람제도, 회합의 정례화 등이 제기되었고, ${\ulcorner}$하부 구조적 요인${\lrcorner}$으로는 품질기능 전개(QFD), 컨커런트 엔지니어링(CE), 평가 및 보상시스템 등이 제기되었다. 그리고 이들 요인들은 부서간의 공동목표, 상호작용, 아이디어 및 정보 공유등에 큰 영향을 미치는 것으로 나타났다. 결과적으로 이들 요인들의 상호작용에 의해 신제품 개발성과의 내용이 크게 좌우되는 것으로 연구되었다. 본 논문의 의의는 선행연구에서 간과되어온 부서간 협력의 ${\ulcorner}$하부구조요인${\lrcorner}$ 이 신제품개발성과에 미치는 영향이 크다는 것을 부각시키는데 있다. 다만 이 연구에서는 이론적 틀을 제공하는데 범위를 한정하였으며, 향후 실증연구를 통하여 관련 변수간의 관계를 구체적으로 검증을 할 예정이다.