미만성 축삭 손상에서 전산화단층촬영과 경사에코 자기공명영상을 이용한 예후의 평가

정남기 ( Nam Ki Jung ),진상찬 ( Sang Chan Jin ),최우익 ( Woo Ik Choi ) 대한외상학회 2012 大韓外傷學會誌 Vol.25 No.4

Purpose: Diffuse axonal injury (DAI) is clinically defined as a coma of over six hours in a head trauma victim without a focal mass lesion. The emergency physician usually resuscitates and stabilizes a comatose head trauma victim in the emergency Department. After assessment and treatment, the prognosis is very important to both the victim and the physician. The prognosis for DAI is based on Glasgow Coma Scale (GCS) and other imaging data. We investigated the prognostic value of computed tomography (CT) and gradient-echo magnetic resonance imaging (GRI) for head trauma victims with DAI. Methods: Fifty-three(53) head trauma victims of DAI were enrolled in this study from 2007 to 2012. During the study period of six years, data on trauma victims were collected retrospectively. We analyzed the differences in the Glasgow Outcome Scale (GOS) result between the CT and the GRI modalities. Results: We classified the study group by using GOS. Between the good outcome subgroup (GOS scores of 4 and 5) and the poor outcome subgroup (GOS score of 1-3), there were no statistical difference in sex, age, initial vital signs and initial GCS score. The good outcome subgroup had non-hemorrhage on CT(52%), which was correlated with good outcome and a shorter awakening time, while a larger number and a deeper location of hemorrhagic lesions on in GRI were correlated with poor outcome in DAI. Conclusion: We conclude that the existence of hemorrhagic lesions on CT, and the number and location of those lesions on GRI had good prognostic value for head trauma victims with DAI. (J Trauma Inj 2012;25:122-131)

간장및 담도 : 산모와 신생아에서 C형간염바이러스의 수직감염에 관한 연구

정남기(nam Ki Joung),장영호(Yung Ho Chang),유영근(Young Geun Ryoo),정만(Mann Jung),심승식(Seung Shik Shim),오은아(Eun A Ho) 대한소화기학회 1990 대한소화기학회지 Vol.22 No.2

N/A In order to confirm the perinatal transmission of hepatitis C virus from pregnant women to newborn infants, anti-HCV was tested in 45 pregnant women and their 46 newborn infants who were negative for HBsAg and IgM anti-HA and who showed elevated ALT in more than 2 follow-up tests. The results were as follows; 1) The mean age of 45 pregnant women was 26.8. There was no significant relationship between epidemiologic factors and elevated ALT in pregnant women. 2) Among 45 HBsAg and IgM anti-HA negative pregnant women, 22 were anti-HBs and anti-HBc positive, 14 were anti-HBc positive only, and 9 were anti-HBs and anti-HBc negative. The degree of abnormal ALT in mothers and infants was unrelated to the hepatitis B viral markers in mothers. There was no significant relationship in the degree of ALT elevation between mothers and infants. 3) Anti-HCV was positive in 7 cases (15.6%) of 45 pregnant women. Anti-HCV was positive in 6 cases (15.2%) of 46 newborn infants. In the 7 anti-HCV positive mothers, anti-HCV was positive for one year or a maximum of four years and ALT was elevated intermittently for more than one year, the same as chronic viral hepatitis. But in the 6 cases of anti-HCV positive infants, anti-HCV disappered within 6 or 12 months in most cases and ALT elevation didnt continue for more than 6 months. 4) Anti-HCV was positive in 4 cases (50%) of 8 newborn infants of anti-HCV positive mothers (p< 0.01). Anti-HCV was positive in 2 (67.7%) of 3 cases whose blood was drawn and stored immediately after birth. The positive rate of anti-HCV was about 15% in 45 pregnant women and their infants who were NANB hepatitis suspects by surrogate tests. Anti-HCV was positive in 50% and ALT was abnormal in all eight infants of chronic HCV carrier mothers. We confirmed the passive transfer of anti-HCV from mother to infant. But we need more evidence to confirm the perinatal transmission of HCV.

KOMPSAT-2/3/3A호의 영상융합에 대한 품질평가 프로토콜의 비교분석

정남기 ( Nam-ki Jeong ),정형섭 ( Hyung-sup Jung ),오관영 ( Kwan-young Oh ),박숭환 ( Sung-hwan Park ),이승찬 ( Seung-chan Lee ) 대한원격탐사학회 2016 大韓遠隔探査學會誌 Vol.32 No.5

Many image fusion quality assessment techniques, which include Wald`s, QNR and Khan`s protocols, have been proposed. A total procedure for the quality assessment has been defined as the quality assessment protocol. In this paper, we compared the performance of the three protocols using KOMPSAT- 2/3/3A satellite images, and tested the applicability to the fusion quality assessment of the KOMPSAT satellite images. In addition, we compared and analyzed the strengths and weaknesses of the three protocols. We carried out the qualitative and quantitative analysis of the protocols by applying five fusion methods to the KOMPSAT test images. Then we compared the quantitative and qualitative results of the protocols from the aspects of the spectral and spatial preservations. In the Wald`s protocol, the results from the qualitative and quantitative analysis were almost matched. However, the Wald`s protocol had the limitations 1) that it is timeconsuming due to downsampling process and 2) that the fusion quality assessment are performed by using downsampled fusion image. The QNR protocol had an advantage that it utilizes an original image without downsampling. However, it could not find the aliasing effect of the wavelet-fused images in the spectral preservation. It means that the spectral preservation assessment of the QNR protocol might not be perfect. In the Khan`s protocol, the qualitative and quantitative analysis of the spectral preservation was not matched in the wavelet fusion. This is because the fusion results were changed in the downsampling process of the fused images. Nevertheless, the Khan`s protocol were superior to Wald`s and QNR protocols in the spatial preservation.

NIR 관련 논문 통계 분석에 의한 NIR 원격탐사의 기술 및 활용분야 고찰

백원경,박숭환,정남기,권수경,진원지,정형섭,Baek, Won-Kyung,Park, Sung-Hwan,Jeong, Nam-Ki,Kwon, Sookyung,Jin, Won-Ji,Jung, Hyung-Sup 대한원격탐사학회 2017 大韓遠隔探査學會誌 Vol.33 No.5

본 연구에서는 NIR(Near-Infrared) 원격탐사 자료를 이용한 연구의 결과인 논문을 분석함으로써 NIR의 기술 및 활용 연구 분야를 체계적으로 정리하고, 이후 NIR 영상을 활용한 연구의 흐름과 방향을 정립하는 데에 목표가 있다. 이를 위하여 최근 5년간의 국내 저널들과 활용 분야 SCI저널, 기술 개발 분야 SCI저널에 대하여 NIR 활용 연구에 관하여 사례조사를 실시하였다. 선별작업 이후 총 281편의 논문에 대하여 분석을 수행하였으며 통계 분석을 위해 분류와 소분류로 구분하여 우세한 연구 추세를 살펴보았다. 그 결과 논문 작성을 수행한 연구자들의 소속은 대학이 약 60% 이상으로 가장 높았다. 적용 분야의 경우 국외에서 육지 50%, 환경 30% 그리고 재해 11%의 분포를 나타냈다. 한편 국내의 경우 육지 55%, 환경 24%, 재해 10%의 분포를 보였다. 육지에 대한 국내 연구 사례는 임업과 농업이 각각 47%, 28%로 가장 높은 비율을 차지했다. 그 외에 국토관리(17%), 지질/자원과 관련하여 나머지 8%를 차지했다. NIR을 활용한 재해 관측은 산사태, 가뭄, 기상재해, 홍수 등에 활용되었다. 여기서 특히 기상재해는 황사에 관한 연구 결과로 국내의 실정이 반영된 것으로 보인다. 하지만 국내의 연구 사례 중 산불 탐지에 관한 결과가 존재하지 않았다. 국내의 실정을 고려해 볼 때에 이에 관한 추가적이고 활발한 연구가 수행될 필요가 있어 보인다. 이 통계적 논문 분석 자료가 향후 우리나라의 NIR 기술 개발과 활용 분야 확장에 도움이 될 기초 자료로 활용될 수 있기를 기대한다. In this study, we analyzed the paper about NIR (Near-Infrared) remote sensing data and systematically summarized the research and application fields of NIR. To do this, we conducted a case study on the use of NIR in domestic journals, and SCI journals in the field of technology development for the last 5 years. After selection, a total of 281 journals were analyzed. For the statistical analysis, the classification was divided into subclasses and the dominant research trends were examined. As a result, the researchers who wrote the papers made the highest score of about 60% or more at university. In the field of application, 50% of land, 30% of environment, and 11% of disaster were distributed on SCI journals. In Korea, on the other hand, 55% of land, 24% of environment and 10% of disasters were distributed. In addition, 17% of the national land management and 8% of the geological / natural resources. Disaster observation using NIR was used for landslide, drought, weather disaster and flood. In particular, meteorological disasters are a result of study on Asian dust. However, there were no results of forest fire detection in Korea. Considering the domestic situation, it seems necessary to carry out additional and active research on this. It is expected that this statistical analysis data will be used as basic data to help expand the NIR technology development and utilization field in Korea in the future.

독일 건강보험의 고령화적립금 연구와 정책적 시사점

김대환 ( Dae Hwan Kim ),정남기 ( Nam Ki Jung ) 한독경상학회 2017 經商論叢 Vol.35 No.2

본 논문은 독일의 민영건강보험에서 활용하고 있는 고령화적립금제도를 살펴봄으로써 우리나라 민영건강보험 중 가장 중요한 상품으로 평가받고 있는 실손의료보험에 대한 정책적 시사점을 도출하는데 목적이 있다. 우리나라 국민들은 국민건강보험의 취약한 보장률을 보충하기 위해 실손의료보험에 가입하고 있다. 일반적으로 청장년기에는 소득이 높은 반면 의료비 지출은 낮고, 노년기에는 소득이 낮은 반면 의료비 지출은 높다. 문제는 실손의료보험의 보험료 수준이 연령에 연동되어 있어 정작 실손의료보험이 필요한 고령자들은 높은 보험료 때문에 가입하지 못하고 있다. 연령증가에 따라 소득과 의료비 지출 흐름이 서로 반대로 증감하는 것은 모든 나라의 공통적인 문제이다. 독일은 이 문제를 고령화적립금제도로 해결하고 있다. 소득이 높은 60세 이전에는 실제 필요한 보험료보다 높은 보험료를 지불하고, 보험회사는 보험료 중 일부를 보험금(의료비)으로 사용하였다가 나머지는 고령화적립금으로 적립해둔다. 이후 가입자가 소득이 낮은 노년기에 접어들면 이전에 쌓아두었던 고령화적립금을 활용하여 가입자의 의료비 보장에 활용한다. 결과적으로 독일은 민영보험가입자의 연령에 관계없이 동일한 수준의 보험료를 부과하는 체계를 구축하고 있으며, 이러한 보험료 산출체계를 법으로 규정하고 있다. 우리나라의 청장년기 빈곤율은 OECD 국가 중 낮은 편으로 소득수준이 높다. 반면 65세 이상의 빈곤율은 49.6%로 OECD 평균 11.4%를 훨씬 상회한다. 그러므로 실손의료보험에 독일의 고령화적립금제도를 적용하여 의료비 보장을 위한 사적안전망의 유용성을 제고시킬 필요가 있다. By reviewing the aging reserve policy utilized in private health insurance in Germany, the aim of this study is to suggest policy implications for fee-for-service private health insurance. People in Korea buy the fee-for-service private health insurance to make up the low coverage of the public health insurance. It is well known that the income and medical expenditure stream are negatively and positively associated with age, respectively. The main problem in the fee-for-service private health insurance that premium level is coupled with age. As a result, the elderly whose medical expenditure is high and income level is low are not able to buy or maintain the fee-for-service private health insurance. It is a common issue for all countries that income and medical expenditure move in the opposite way as age increases. Germany solves the problem with a aging reserve policy. Before age 60, a insured pays premium higher than their actual risk level and a insurer saves some of the premium. When the insured passes age 60, the insurer uses the saved premium to cover the medical expenditure of the insured aged over 60. That is, the insured pays the same level of premium regardless of his or her age. This aging reserve system in calculating premium is even imposed by the law in Germany. The poverty rate for young and middle-aged population in Korea is lower than the average poverty level of OECD countries. The poverty level for the Korean elderly is, however, 49.6% which is much higher than 11.4% among the OECD countries. Therefore, it would be worthy to apply the aging reserve policy for the fee-for-service private health insurance in Korea to enhance the usage of the private security system for covering medical expenditures.

아리랑 2/3호 고해상도 위성영상에 적합한 융합기법

오관영 ( Kwan Young Oh ),정형섭 ( Hyung Sup Jung ),정남기 ( Nam Ki Jeong ) 대한원격탐사학회 2015 大韓遠隔探査學會誌 Vol.31 No.2

본 논문은 아리랑 2호와 3호에 대한 고해상 다분광 영상 제작을 위한 효과적인 영상융합 기법을 제시한다. 제안된 기법은 널리 알려져 있는 CS 기반의 영상융합 기법을 기본으로 하고 있다. 제안된 기법의 융합 과정은 크게 두 가지 단계로 구분할 수 있다. 첫 번째는 가중 평균된 다분광 영상을 이용한 Intensity 영상의 제작 단계와 두 번째는 최적화된 융합 매개변수를 통한 고주파 영상의 생성 단계이다. 제안된 기법에서는 기존의 방법을 개선한 다른 새로운 형식의 융합 매개변수를 정의하였으며, 이는 고주파 영상, 전정색 영상과 다분광 영상 간 공분산/분산 비를 이용하여 도출된다. 본 알고리즘의 평가를 위해서 기존의 융합 방법들의 결과와 정량적, 시각적 비교분석을 수행하였다. 정량적 분석에는 Spatial ERGAS, Spectral ERGAS, SAM, Q4 평가 지표가 사용되었다. 분석결과, 제안된 기법은 기존의 CS 기반의 영상융합 기법에 비하여 공간적/분광적인 측면에서 모두 향상된 결과를 나타냈다. This paper presents an efficient image fusion method to be appropriate for the KOMPSAT-2 and 3 satellites. The proposed method is based on the well-established component substitution (CS) approach. The proposed method is divided into two parts: 1) The first step is to create a intensity image by the weighted-averaging operation of a multi-spectral (MS) image and 2) the second step is to produce an optimal high-frequency image using the statistical properties of the original MS and panchromatic (PAN) images. The performance of the proposed method is evaluated in both quantitative and visual analysis. Quantitative assessments are performed by using the relative global dimensional synthesis error (Spatial and Spectral ERGAS), the image quality index (Q4), and the spectral angle mapper index (SAM). The qualitative and quantitative assessment results show that the fusion performance of the proposed method is improved in both the spectral and spatial qualities when it is compared with previous CS-based fusion methods.

아리랑 2호/3호 영상을 이용한 영상융합 비교 분석

오관영(Oh, Kwan Young),정형섭(Jung, Hyung Sup),정남기(Jeong, Nam Ki),이광재(Lee, Kwang Jae) 한국측량학회 2014 한국측량학회지 Vol.32 No.2

살서제 RH-787 중독증의 임상적 연구

이태희 ( Tai Hee Lee ),정민영 ( Min Young Chung ),박양규 ( Yang Kyu Park ),김영석 ( Young Suk Kim ),정남기 ( Nam Ki Jung ) 대한내과학회 1977 대한내과학회지 Vol.20 No.6