• 보건행정학회지
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• 제13권3호
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• pp.104-128
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• 2003

Equity in health care has taken priority in the Korean government's policy agenda after the government-led national health insurance achieved universal coverage in 1989 along with the final inclusion of the self-employed as beneficiary. The purpose of this study is to examine the extent to which there exists difference or inequality in the utilization of health care, especially cancer inpatient services among income classes. We analysed the utilization of cancer inpatient services of residents in Jeju Island for a year of 2000, using the national health insurance data for qualification of beneficiaries and utilization of health care. The independent variable are 10 income classes based on the national health insurance fee imposed on each household for a year of 2000. The dependent variables of this study are an amount of cancer inpatient health care utilization measured by cancer admission days and cancer treatment costs. Also, cancer inpatient health care utilization is analysed by three categories divided into utilization in medical care institutions (1) within Jeju Island, (2) outside Jeju Island, and (3) all within and outside Jeju Island. We measured concentration index of cancer inpatient health care utilization. This analysis showed negative concentration index within Jeju Island and positive outside Jeju Island, and positive in all within and outside Jeju Island. This results suggest inequality against the relatively poor income groups in utilization of cancer inpatient health care services. Especially, inequity of cancer inpatient health care would be more serious in Jeju Island of Korea, considering that lower income groups reportedly have higher incidence rates in most of cancer and thus use more health services.

• 정보관리학회지
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• 제28권2호
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• pp.177-193
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• 2011

본 연구에서는 학술지를 대상으로 온톨로지를 구축하고 그 성능을 평가하고자 하였으며, 트리플 구조로 구축된 온톨로지의 성능을 단순 키워드 검색엔진을 위한 도치색인 파일의 지식베이스와 그 성능을 비교하였다. 온톨로지 구축대상은 정보관리학회지 2007년부터 2009년까지의 3년간의 논문기사를 대상으로 하였으며, 구축방법은 온톨로지 구축도구인 프로티지를 이용하였다. 개념온톨로지는 수작업으로 구축하였고, 서지온톨로지는 자동으로 구축하여 각각 OWL 개념온톨로지와 OWL 서지온톨로지를 생성하였다. 성능비교를 위해 각각 제나 검색엔진과 루씬 검색엔진에 의해 검색된 결과를 비교하였다. 루씬은 정확률이 높게 나왔고, 제나는 재현률이 높게 나왔다.

• 한국산학기술학회논문지
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• 제14권12호
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• pp.6346-6352
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• 2013

직장암의 방사선치료는 정지된 영상을 이용하였다. 하지만 방사선치료 시 환자의 움직임이 발생된다. 이에 직장암 환자 14명을 대상으로 치료시간과 체형에 따른 기법별 자세오차를 비교하고자 하였다. 또한 평균오차에 대한 기법별 선량학적 변화량을 비교하였다. 비교를 통해 치료기법 선택의 기준을 마련하고자 하였다. 측정결과 3DCRT와 VMAT은 치료시간 및 자세오차가 비슷하였다. 이에 비해 IMRT는 치료시간이 약 2배, 자세오차는 약 4배 증가하였다. 체형에서는 비만형일수록 모든 치료기법에서 자세오차가 증가하였다. 선량평가에서는 소장측면에서는 동일한 오차에 대해 IMRT와 VMAT이 3DCRT에 비해 큰 폭의 선량증가를 보였다. 따라서 비만형인 직장암 환자의 경우 치료시간이 짧은 3DCRT를 적용하여야 한다. 소장의 피폭이 많을 경우에는 IMRT보다는 VMAT을 선택하여야 한다.

• 한국수산과학회지
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• 제46권6호
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• pp.878-885
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• 2013

Seasonal variation in marine macroalgal community structure was examined at the intertidal zones of Heuksando and Hongdo, Shinan, Korea, from July 2008 to May 2009. In total, 86 macroalgal species were identified, including 12 green, 19 brown, and 55 red algae; 67 species at Heuksando and 70 species at Hongdo, were observed. Annual seaweed biomass was 252.44 g dry $wt/m^2$ at Heuksando and 217.67 g dry $wt/m^2$ at Hongdo. The dominant seaweed in importance value (IV > 15) differed between the sites: Sargassum thunbergii at Heuksando and Corallina pilulifera at Hongdo. The vertical distribution pattern of seaweeds from the upper to lower intertidal zones at Heuksando was Gloiopeltis spp., Ulva spp. - S. thunbergii, S. fusiforme, Hildenbrandia rubra - S. thunbergii, C. pilulifera. On the rocky shore of Hongdo, seaweed zonation was distinct: Porphyra yezoensis, Gloiopeltis spp., Ulva spp. - C. pilulifera, S. fusiforme, Myelophycus simplex - Chondrus ocellatus, C. pilulifera, and Carpopeltis affinis. Annual seaweed coverage, richness index (R), evenness index (J'), and diversity index (H') values were greater at Hongdo (41.35%, 12.82, 0.59, and 2.50 respectively) than at Heuksando (31.54%, 11.93, 0.44, and 1.87 respectively), which may indicate that the seaweed community at Hongdo is more stable relative to the one at Heuksando.

• 천문학회지
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• 제48권5호
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• pp.299-311
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• 2015

We report first results from KVN and VERA Array (KaVA) VLBI observations obtained in the frame of our Plasma-physics of Active Galactic Nuclei (PAGaN) project. We observed eight selected AGN at 22 and 43 GHz in single polarization (LCP) between March 2014 and April 2015. Each source was observed for 6 to 8 hours per observing run to maximize the uv coverage. We obtained a total of 15 deep high-resolution images permitting the identification of individual circular Gaussian jet components and three spectral index maps of BL Lac, 3C 111 and 3C 345 from simultaneous dual-frequency observations. The spectral index maps show trends in agreement with general expectations – flat core and steep jets – while the actual value of the spectral index for jets shows indications for a dependence on AGN type. We analyzed the kinematics of jet components of BL Lac and 3C 111, detecting superluminal proper motions with maximum apparent speeds of about 5c. This constrains the lower limits of the intrinsic component velocities to ~ 0.98c and the upper limits of the angle between jet and line of sight to ~20°. In agreement with global jet expansion, jet components show systematically larger diameters d at larger core distances r, following the global relation d ≈ 0.2r, albeit within substantial scatter.

• Journal of Preventive Medicine and Public Health
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• 제41권3호
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• pp.165-172
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• 2008

Objectives : Despite various government initiatives, including the expansion of national health insurance coverage, health inequality has been a key health policy issue in South Korea during the past decade. This study describes and compares the extent of the total health inequality and the income-related health inequality over time among Korean adults. Methods : This study employs the 1998, 2001 and 2005 Korean National Health and Nutrition Examination Surveys (KNHANESs). The self-assessed health (SAH) ordinal responses, measured on a five-point scale, resealed to cardinal values to measure the health inequalities with using interval regression. The boundaries of each threshold for the interval regression analysis were obtained from the empirical distribution of the EuroQol-5 Dimension (EQ-5D) valuation weights estimated from the 2005 KNHANES. The final model predicting the individuals' health status included age, gender, educational attainment, occupation, income, and the regional prosperity index. The concentration index was used to measure and analyze the health inequality. Results : The KNHANES data showed an unequal distribution of the total health inequality in favor of the higher income groups, and this is getting worse over time (0.0327 in 1998, 0.0393 in 2001 and 0.0924 in 2005). The income-related health inequality in 2005 was 0.0278, indicating that 30.1% of the total health inequality can be attributed to income. Conclusions : The findings indicate there are health inequalities across the sociodemographic and income groups despite the recent government's efforts. Further research is warranted to investigate what potential policy actions are necessary to decrease the health inequality in Korea.

• 한국치위생학회지
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• 제15권1호
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• pp.19-29
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• 2015

Objectives: The purpose of the study is to investigate the related factors to dental care utilization, oral health behaviors, and oral health status in immigrant workers in Korea. Methods: The subjects were 504 foreign immigrant male workers over 20 years old who visited Daegu labor consultation center for oral health survey and oral examination. The questionnaire included 5 questions of socioeconomic characteristics, 8 questions of oral health practice behavior, 6 questions of dental clinic visit, 8 questions of social relations and Korean language proficiency. The question for health behavior was measure by body mass index(BMI). Social relations and Korean language proficiency instrument was modified by Seol from "Family welfare survey in Korean international marriage" and scored by Liker 5 scale. Results: The oral health examination of the immigrant workers was as follows: decayed teeth - 76.6%, filling teeth - 27.4%, missing teeth - 69.8%, dental caries experience above five or more - 60.2%, periodontal pocket tissues - 58.9%. Simplified Oral Hygiene Index was very poor and accounted for 49.0%. Dental care utilization experience was closely associated with social relation indexes including attendance in family events, household stuff help, financial help and counseling for hard work(p<0.01). Dental care utilization experience proportionally increased with proficiency in Korean literacy including speaking, listening, and writing abilities of Korean language(p<0.01). Conclusions: In order to improve the oral health condition of the immigrant workers, it is important to provide social network, Korean language proficiency support, and health insurance coverage through economic burden reduction by the Korean government.

• International Journal of Advanced Culture Technology
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• 제8권2호
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• pp.1-5
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• 2020

As the world gradually advances to an aging society, the quality of human life is valued. Among them, 'quality of sleep' is very closely related to quality of life. Recently, Korea expanded health insurance coverage for "sleep disorders". Particularly, as the number of sleep multiple tests and prescriptions for sleep aids has increased rapidly, much attention has been focused on the related medical service environment. Therefore, this study looked at an in-depth interview of 11 hospitals to see what treatment delivery system is being established when the government applies health insurance for 'sleep disorders'. In conclusion, the organizations with the most average number of sleep polyp tests per day were found to have more sleep polyp labs (hardware) and more full-time specialists. Also, the polysomnography lab (hardware) and the specialist's full-time status (software) did not necessarily result in a "positive pressure regulator prescription" that can solve "sleep apnea" caused by "sleep ailments". Rather, it was found that the number of days of sleep multiple laboratories (hardware), the number of full-time specialists (software) or the specialty majors (software) had a greater impact. In particular, the higher the specialist's full-time personnel (software) index (=6.000), the higher the sleep-inducing agent prescription rate(=1.000), and the lower the specialist's full-time personnel (software) index (=1.000), the higher the sleep-inducer's prescription rate(= 0.010) Was low. In addition, even if the professional full-time personnel(software) index was the same (=1.000), the hospital type was lower as it was closer to the public hospital(=0.067) and higher at the specialized hospital (= 0.933). In the case of university hospitals, when the full-time specialists (software) are in the same condition (= 1.000), the frequency of use of the sleep laboratory (=1.000) and the sleep test rate (= 1.000) were all the same.

• Asia pacific journal of information systems
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• 제29권4호
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• pp.856-874
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• 2019

The performance of recommender systems (RS) has been measured mainly in terms of accuracy. However, there are other aspects of performance that are difficult to understand in terms of accuracy, such as coverage, serendipity, and satisfaction with recommended results. Moreover, particularly with RSs that suggest multiple items at a time, such as YouTube, user satisfaction with recommended results may vary not only depending on their accuracy, but also on their configuration, content, and design displayed to the user. This is true when classifying an RS as a single RS with one recommended result and as a multiple RS with diverse results. No empirical analysis has been conducted on the influence of the content and distribution of recommendation items on user satisfaction. In this study, we propose a research model representing the content and distribution of recommended items and how they affect user satisfaction with the RS. We focus on RSs that recommend multiple items. We performed an empirical analysis involving 149 YouTube users. The results suggest that user satisfaction with recommended results is significantly affected according to the HHI (Herfindahl-Hirschman Index). In addition, satisfaction significantly increased when the recommended item on the top of the list was the same category in terms of content that users were currently watching. Particularly when the purpose of using RS is hedonic, not utilitarian, the results showed greater satisfaction when the number of views of the recommended items was evenly distributed. However, other characteristics of selected content, such as view count and playback time, had relatively less impact on satisfaction with recommended items. To the best of our knowledge, this study is the first to show that the category concentration of items impacts user satisfaction on websites recommending diverse items in different categories using a content-based filtering system, such as YouTube. In addition, our use of the HHI index, which has been extensively used in economics research, to show the distributional characteristics of recommended items, is also unique. The HHI for categories of recommended items was useful in explaining user satisfaction.

• 대한방사선치료학회지
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• 제25권1호
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• pp.1-8
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• 2013

목 적: 체내에서 광자선은 에너지에 따라 다른 선량분포 특성을 보이기 때문에 치료계획 시 적절한 에너지 선택이 중요하다. 두경부암 세기변조방사선치료(intensity modulated radiation therapy, IMRT)는 주로 저에너지 광자선을 사용하는데, 본 연구에서는 후사방향 조사면에 부분적으로 고에너지 광자선을 사용하였을 때 치료계획에 미치는 영향을 알아보고자 한다. 대상 및 방법: 본원에서 두경부암 세기변조방사선치료를 시행한 10명(nasopharyngeal carcinoma 5, tonsilar carcinoma 5)의 환자를 대상으로 하였다. 동일한 조건하에 환자의 CT영상을 3 mm 두께로 획득하고 치료계획시스템은 Eclipse (Ver 7.1, Varian, Palo Alto, USA)를 사용하였다. 환자마다 8개 조사면으로 6 MV 에너지를 사용한 치료계획(low energy plan, LEP)과 상대적으로 투과 깊이가 깊은 후사방향의 2개 조사면에서 15 MV 에너지를 사용한 치료계획(partially used high energy plan, PHEP)을 각각 수립하였으며, 다른 치료계획조건들과 plan normalization은 동일하게 적용하였다. 수립된 치료계획을 평가하기 위해서 계획표적체적(planning target volume, PTV)의 coverage, conformity index (CI), homogeneity index (HI)를 비교하였고 양측 이하선의 $D_{mean}$, $D_{50%}$와 뇌척수의 $D_{max}$, $D_{1%}$ 그리고 integral dose (ID)를 비교하였다. 특히, 후경부의 정상조직선량을 비교하기 위해 posterior-normal tissue volume (P-NTV)을 설정하고 dose volume histogram (DVH)을 통해서 $D_{mean}$, $V_{20Gy}$, $V_{25Gy}$를 평가하였으며, 또한 총 monitor unit (MU)의 변화를 비교하였다. 결 과: LEP와 PHEP 사이에서 PTV의 coverage 그리고 CI의 차이는 크지 않았고, HI는 변화없이 전체적으로 동일하게 나타났다. 뇌척수의 선량변화는 크지 않았지만 양측 이하선의 $D_{mean}$, $D_{50%}$ 그리고 ID는 PHEP에서 각각 0.6%, 0.7%, 1.1% 감소하였다. P-NTV의 $D_{mean}$, $V_{20Gy}$, $V_{25Gy}$는 PHEP에서 각각 1.6%, 1.8%, 2.9% 감소하였고, 총 MU도 평균 1.8% 감소하였다. 결 론: 본 연구결과 후사방향에서 부분적으로 고에너지를 사용한 치료계획에서 일부 결정장기(organ at risk, OAR)와 정상조직의 선량, 그리고 총 MU를 감소시키는 효과가 있었다. 이런 효과가 환자에게 임상적으로 얼마나 이로운지는 명확하지 않지만, 두경부암 세기변조방사선치료 계획 시 부분적으로 고에너지 광자선을 사용하는 것은 치료계획의 전반적인 질을 개선하는 데 유용 할 것으로 본다.