특발성 간질성 폐렴: 병리소견과 방사선소견의 연관

한정호,이경수,Han, Jeong-Ho,Lee, Gyeong-Su 대한영상의학회 2002 대한영상의학회지 Vol.46 No.5

Idiopathic interstitial pneumonias are at present classified as one of four types: usual, nonspecific, acute, or desquamative. The acute form has the worst prognosis, followed by the usual and the nonspecific form; it is in desquamative cases that prognosis is best. At high-resolution CT, usual interstitial pneumonia, the most frequent type, manifests as patchy subpleural areas of ground-glass attenuation, irregular linear opacity, and honeycombing, which the nonspecific type, the second most frequent, appears as subpleural patchy areas of ground-glass attenuation with associated areas of irregular linear opacity. Acute interstitial pneumonia demonstrates extensive bilateral airspace consolidation and patchy or diffuse bilateral areas of ground-glass attenuation in middle and lower lung zones. 특발성 간질성 폐렴은 통상성 간질성 폐렴, 비특이적 간질성 폐렴, 급성 간질성 폐렴, 그리고 박리성 간질성 폐렴 등 네 군으로 분류한다. 급성 간질성 폐렴은 예후가 좋지 않아 높은 사망률을 보이며 박리성 간질성 폐렴이 가장 예후가 좋다. 통상성 간질성 폐렴은 가장 흔하며 고해상도 CT에서 늑막하 부위의 반점상 간유리음영, 불규칙한 선상음영, 그리고 벌집몽야을 보인다. 비특이적 간질성 폐렴은 두 번 째로 흔한 빈도를 보이며, 고해상도 CT 소견은 늑막하 부위의 반점상 간유리음영과 불규칙한 선상음영이다. 급성 간질성 폐렴의 고해상도 CT 소견은 광범위한 기강경화와 반점상, 또는 미만성의 간유리음영이다. 박리성 간질성 폐렴의 흔한 고해상도 CT 소견은 양측 하부 폐 늑막하 부위의 대칭성 간유리음영이다.

유역단위 유출 모형 별 기저유출 분석 기법 검토

한정호,류태상,임경재,정영훈,Han, Jeong Ho,Ryu, Tae Sang,Lim, Kyoung Jae,Jung, Young Hun 한국농공학회 2016 한국농공학회논문집 Vol.58 No.4

Streamflow is composed of baseflow and direct runoff. However, most of streamflow during dry seasons depends on baseflow. Thus, baseflow analysis is very important to simulate streamflow of dry seasons. Generally, baseflow analysis is conducted using watershed-scale runoff models due to diffilculty of measuring baseflow. However, it is needed to understand and review how the model simulates baseflow because each model uses inherent baseflow analysis techniques. In this study, SWAT, HSPF, PRMS-IV were reviewed focusing on baseflow and soil water. HSPF and PRMS-IV calculate baseflow using the variables which depends on user, so the baseflow analysis results of HSPF and PRMS-IV are not consistent. Moreover, soil structures which were assumed from HSPF and PRMS-IV, since these two models assume soil structure as two soil zones and three conceptual reservoirs, were not enough to describe real soil structure. On the other hand, baseflow in SWAT is calculated using baseflow recession constant which can consider the characteristics of aquifer and also, soil structure in SWAT is similar to real soil structures. Thus, baseflow analysis result from SWAT was concluded as the most suitable and reliable model because SWAT can reflect the characteristics and soil structure which is close to reality.

근적외선 투과 분광분석법을 이용한 가향액 중 가향제 분석

한정호,정한주,양범호,이문수,김용옥,Han, Jung-Ho,Jung, Han-Joo,Yang, Burm-Ho,Rhee, Moon-Soo,Kim, Yong-Ok 한국연초학회 2006 한국연초학회지 Vol.28 No.2

It is very important to add uniformly casing materials on tobacco for taste and flavor. However, analysis of casing materials was spent much time, effort and money. The object of this study was the development of a rapid method for the determination of glycerine, propylene glycol(PG), sucrose, glucose, fructose and water in the casing materials using the NIR transmittance method. Hundreds of calibration samples, with extended ranges (50%, 75%, 100%, 125%, and 150% of standard addition) in each constituent, were prepared in the casing materials at the various temperatures $(25^{\circ}C\;and\;30^{\circ}C)$. Calibration equation was developed by modified partial least square (MPLS) method using second derivative. The standard error of calibration and $R^2$ between added value and NIR estimated value results were $0.007{\sim}0.034\;and\;0.996{\sim}1.000$ for the casing sample set, respectively. The standard error of prediction and R2 between added value and NIR estimated value results were $0.010{\sim}0.034\;and\;0.997{\sim}1.000$ for the casing sample set, respectively. The analysis result was not different significantly between the NIR and added value. These results show that the NIR measurement system is an effective tool to ensure quality on the casing materials.

중력렌즈 사건의 측성학적 관측을 통한 추가 천문 정보의 획득

한정호,HAN CHEONGHO 한국천문학회 1999 天文學論叢 Vol.14 No.1

Current searches for gravitational microlensing events are being carried out only by a photometric method. In this review paper, we demonstrate that the nature of Galactic lenses can be significantly better constrained with the additional astrometric observations of microlensng events. First, by astromerically observing lensing events, one can resolve the lens parameter degeneracy, and thus the lens mass can be determined with improved precision. Second, by being free from the blending problem, astrometric observations of lensing events will allow one to improve the uncertainties in the determined Einstein time scales. Third, the lens brightness, which could not be measured photometrically, can be measured from the astrometric observations of lensing events, and thus the nature of lens matter can be better constrained. Finally, with the help of astrometric followup observations of a binary-lens event, one can uniquely determine the solution of lens parameters, allowing one to obtain important astronomical information about the source star and the lens itself.

소유역 별 기저유출 감수상수를 적용한 유량 및 기저유출 모의

한정호,임경재,정영훈,Han, Jeong Ho,Lim, Kyoung Jae,Jung, Younghun 한국농공학회 2017 한국농공학회논문집 Vol.59 No.6

This study attempted to improve the accuracy of streamflow and baseflow prediction of Soil and Water Assessment Tool (SWAT) by applying baselfow recession constants for each sub-watershed. This study set two different scenarios (S1 and S2) to evaluate the impact of application of baseflow recession constants for each sub-watershed on streamflow prediction. In S1, Only the baseflow recession constant obtained from the streamflow station located in the final outlet of study area was applied for whole sub-watersheds. In S2, baseflow recession constants obtained from six different streamflow stations were applied for each sub-watershed. Then, baseflow was separated form the measured streamflow data and the predicted streamflow of S1 and S2 using Web-based Hydrograph Analysis Tool (WHAT). The results showed Nash-Sutcliff efficiency (NSE) and $R^2$ of S2 were a little higher than these of S1 in both streamflow and baseflow prediction results. However, it is important that S2 reflected physical meaning of baseflow recess. Also, recession part of hydrograph in S2 was calibrated better than that of S1 compared to the measured hydrograph.

낙동강 수계에서의 하천유량 변동성과 기저유출 기여도의 관계 분석

한정호,임경재,정영훈,Han, Jeong Ho,Lim, Kyoung Jae,Jung, Younghun 한국농공학회 2016 한국농공학회논문집 Vol.58 No.1

More severe and frequent flood and drought have increased the attentions on the river management. In particular, baseflow is an important element among many streamflow characteristics because streamflow is mainly consisted of direct runoff and baseflow. In this regard, this study attempted to analyze the relationship between streamflow variability and baseflow contributions on Nakdong river basin. For this, two Streamflow Variability Indices (SVI) were used: Coefficient of Variation (CV) and Coefficient of Flow Regime (CFR). Furthermore, baselow separation was individually conducted by three methods (PART, WHAT and BFLOW), and based on this, Baseflow Index (BFI) was calculated. Also, we used the daily streamflow data retrieved from 27 gauge stations in Nakdong river basin for baseflow separation. The results showed that BFI calculated by three models ranges from 0.14 to 0.90 for 27 gauge stations. For SVI, BFI has much higher correlation with CV than with CFR. Also, the inversely proportional relationship between BFI and CV showed that higher baseflow contribution, less streamflow variability.

휴대인터넷 2009년까지 1조원 투자유발

한정호,Han, Jeong-Ho 한국정보통신집흥협회 2004 정보화사회 Vol.170 No.-

통신시장이 최근 격변에 휩싸여 있다. 다양한 신규 통신 서비스의 등장으로 기존 통신시장 구도의 파괴, 유선과 무선의 통합, 방송과 통신 그리고 금융과 통신의 융합 등 통합시장 전반에 걸쳐 지각변동이 일어나고 있다. 이러한 변화의 한복판에서 가장 주목 받고 있는 것이 휴대인터넷(Portable Internet)이다. 휴대인터넷은 이동환경에서 2.3GHz 주파수 대역을 이용해 휴대형 무선단말기로 고속 인터넷 서비스를 제공 받을 수 있는 신규 통신 서비스를 일컫는다. 서비스 개시 5년 이내에 3000억원 이상의 매출 달성이 가능할 것으로 예상된다. 이에 따라 최근 사업자 선정을 앞둔 시점에서 통신사업자들간의 사업권 획득을 위한 치열한 신경전이 전개되고 있다.

$LiOH-H_{3}BO_{3}$ 용액중 Zircaloy-4 핵연료 피복관의 부식가속과 억제

한정호,Han, Jeong-Ho 한국재료학회 1995 한국재료학회지 Vol.5 No.3

LiOH-$H_{3}$BO_{3}$ 용액중에서의 Zircaloy-4 핵연료 피복관의 부식가속과 억제현상을 조사하고 이러한 부식특성에 미치는 Li 및 B의 영향을 해석하기 위하여, 여러 조건의 LiOH-$H_{3}$BO_{3}$ 용액을 사용하여 35$0^{\circ}C$, 165bar의 고온, 고압 조건에서 Zircaloy-4 피복관의 노외 부식시험을 수행하였다. 원전 수화학 모의조건에 대응되는 용액 중에서의 부식속도의 천이는 물 분위기에서 보다 빨리 발생되고 천이후 물 분위기와 거의 유사한 부식속도를 나타내는 천이적 후의 부식거동을 보였다. 한편 pH의 변화는 부식특성에 큰 영향을 미치지 않았다. 부식가속과 억제 모의실험으로부터, 산화막내로 침투하는 Li의 양이 용액중 Li 농도에 크게 의존하며, Li 농도가 일정하게 정해진 용액의 경우 B 첨가에 관계없이 산화막내에 일정량의 Li이 농축될수 있다는 가정을 제시하였다. 또한 B 첨가에 의한 부식억제가 B 또는 B-(OH) 화합물의 산화막내 Li 침투 억제에 의한 것이 아니라 일들에 의해 산화막내로 산화성 성분의 이동이 억제되는데 기인할 수 있음을 제시하였다. 부식가속 개시점에 대응되는 산화막 두께측정 결과와 용액내 Li 농도간의 관계로부터, 용액중 Li 농도가 높을수록 부식가속이 얇은 산화막 두께에서 시작됨을 알았다. 특히 노내조건에서의 핵연료 피복관의 부식가속이 산화막내 Li 농축에 의해 일어나는 부식특성으로 해석될 수 있음을 보였다.

중력렌즈 사건의 측성적 시차효과 검출에 대한 연구

한정호,HAN CHEONGHO 한국천문학회 2000 天文學論叢 Vol.15 No.1

The lens mass determined from the photometrically obtained Einstein time scale suffers from large uncertainty due to the lens parameter degeneracy. The uncertainty can be substantially reduced if the mass is determined from the lens proper motion obtained from astrometric measurements of the source image centroid shifts, ${\delta}{\theta}_c$, by using high precision interferometers from space-based platform such as the Space Interferometry Mission (SIM), and ground-based interferometers soon available on several 8-10m class telescopes. However, for the complete resolution of the lens parameter degeneracy it is required to determine the lens parallax by measuring the parallax-induced deviations in the centroid shifts trajectory, ${\Delta}{\delta}{\theta}_c$ aloe. In this paper, we investigate the detectabilities of ${\delta}{\theta}_c$ and ${\Delta}{\delta}{\theta}_c$ by determining the distributions of the maximum centroid shifts, $f({\delta}{\theta}_{c,max})$, and the average maximum deviations, $(<{\Delta}{\delta}_{c,max}>)$, for different types of Galactic microlensing events caused by various masses. From this investigation, we find that as long as source stars are bright enough for astrometric observations it is expected that $f({\delta}{\theta}_c)$ for most events caused by lenses with masses greater than 0.1 $M_\bigodot$ regardless of the event types can be easily detected from observations by using not only the SIM (with a detection threshold but also the ${\delta}{\theta}_{th}\;\~3{\mu}as)$ but also the ground-based interferometers $(with\;{\delta}{\theta}_{th}\;\~3{\mu}as)$. However, from ground-based observations, it will be difficult to detect ${\Delta}{\delta}{\theta}_c$ for most Galactic bulge self-lensing events, and the detection will be restricted only for small fractions of disk-bulge and halo-LMC events for which the deviations are relatively large. From observations by using the SIM, on the other hand, detecting ${\Delta}{\delta}{\theta}_c$ will be possible for majority of disk and halo events and for a substantial fraction of bulge self-lensing events. For the complete resolution of the lens parameter degeneracy, therefore, SIM observations will be essential.

금강 중·하류역의 이?화학적 수질특성 및 어류 군집특성

한정호 ( Jeong-ho Han ),안광국 ( Kwang Guk An ) 한국환경생물학회 2013 환경생물 : 환경생물학회지 Vol.31 No.3

본 연구에서는 2004~2005년에 금강 중?하류부의 이?화학적 수질 특성을 분석하였고, 또한 어종 분포 및 길드분석을 통해 어류 군집특성을 비교 평가하였다. 대부분 수질 변수들은 몬순 장마기(7~8월)의 집중강우로 인해 계절적인 수질변이가 나타났다. BOD의 평균 농도는 각각 평균 1.6 mg L-1 (1차 조사), 4.0 mg L-1 (2차 조사)으로 중류 지점에 비하여 하류지점에서 더 높은 것으로 나타났으며, 계절별로 BOD 농도에서도 하류지점의 변이가 더 큰 것으로 나타났다. 채집된 어류는 총 11과 34종이었으며, 이중 한국고유종에 속하는 종은 7종(30.3%)이었다. 전체 어종 중 20% 이상의 비율을 보이는 종으로는 피라미가 25.9%, 됭경모치가 21.5%로 우점하여 나타났다. 국외에서 도입된 외래어종은 떡붕어 한종만 출현하였고, 개체수 비교풍부도가 1.8%이었다. 회유성 어종으로는 웅어, 뱀장어, 황복 3종이 출현하였다. 군집분석 결과에 따르면, 종 풍부도 지수는 다른 지점에 비해 많은 종이 출현한 최하류 구간 (S6)에서 3.714로 높게 나타났으며, 중류구간 (S4)에서 1.961로 가장 낮게 나타났다. 종 다양도 지수는 중류구간 (S2) 1.01, 하류구간인 (S5)에서 0.507로 나타났다. 어류의 내성도 길드분석에 따르면, 내성종이 전체 중 49%를 차지하였고, 반면민감종은 4.4%로 나타나 단연 내성종이 우세하게 나타났다. 섭식 길드분석에서는 잡식종은 49%, 충식종은 46.8%으로 유사한 구성비를 보였다. The objectives of the study were to analyze chemical water quality and fish community structures in the downstreams of Geum River during 2004~2005. Water quality parameters showed that ionic dilution was evident during July~August due to a rainfall and river runoff by Asian monsoon. Mean concentrations of BOD showed a seasonal variation and were greater in the downstream than in the midstream. The total number of fish species observed was 34 (11 families) and 30.3% of them was Korean endemic species. The dominant species with ¤20% of the total were Zacco platypus (25.9%) and Microphysogobio jeoni (21.5%) in the river. Exotic species observed was only one species, Carassius cuvieri with relative abundance of 1.8%. According to the structure analysis of fish community, species richness index was highest (3.714) in S6 and lowest in S4 (1.961), while species diversity index was highest in S2 (1.01) and lowest in S5 (0.507). Tolerant species dominated the fish community (49%), and the sensitive species were rare (4.4%), indicating a biological degradation of ecosystem. In the mean time, omnivore species was composed of 49% in the fish community and insectivore species was nearly same with the proportion of the omnivores.