불균질 대수층에서 유선 시뮬레이션을 이용한 다수 오염원의 용질 이동 모사

정승필,최종근,Jung Seung-Pil,Choe Jong-Geun 한국지하수토양환경학회 2005 지하수토양환경 Vol.10 No.3

2차원 불균질 대수층에서 다수의 오염원이 있음 경우 오염물의 거동을 모사할 수 있는 방법을 제시하였다. 이 방법은 유선 시뮬레이션을 기반으로 하며 다차원의 계산을 다수의 일차원으로 분해하여 계산하는 방법으로서 불균질한 매질에서 수두 계산을 한 후, 관심영역에 유선을 분포시키고 그 유선을 띠라 오염물이 전파되는 농도를 계산한다. 개발된 모델을 Visual MODFLOW를 이용하여 검증하였고 시간에 따른 농도 분포나 관측정에서의 용질 도달 곡선이 잘 일치함을 확인할 수 있었다. 개발된 모델은 시뮬레이션 수행 시간에 대한 효율 면에서 Visual MODFLOW보다 뛰어나 많은 연산을 필요로 하는 대규모 대수층의 용질거동 예측이나 반복 계산을 필요로 하는 역산 모델링에서 효과적으로 사용될 수 있다. This study presents a contaminant transport model suitable for a 2-dimensional heterogeneous aquifer with multiple contaminant sources. It uses a streamline simulation, which transforms a multi-dimensional problem into multiple 1dimensional problems. It runs flow simulation, streamline tracking, and calculation of contaminant concentrations by turns. The model is verificated with a Visual MODFLOW by comparing contaminant concentration distributions and breakthrough curves at an observation well. Due to its fast simulation, it can be applied to time consuming simulations such as in a fine-grided aquifer, an inverse modeling and other applications.

가족집적성을 보이는 B형간염 바이러스 만성보유자에서 바이러스 유전자의 돌연변이와 주조직접합체 양상 - 질병발현 형태와의 관련성을 중심으로 -

정승필,이효석,김정룡,안윤옥,Jung, Seung-Pil,Lee, Hyo-Suk,Kim, Chung-Yong,Ahn, Yoon-Ok 대한예방의학회 2000 Journal of Preventive Medicine and Public Health Vol.33 No.3

Objectives : Chronic HBsAg carriers are the principal source of infection for other susceptible people, and are themselves at high risk of developing serious liver diseases. In Korea, it has been estimated that 65-75% of the HBsAg positives remained as persistent carriers. Additionally, familial clustering of MBV infection has frequently been observed among carriers. Some would become progressive, chronic hepatitis patients, and others would not. The aim of this study was to evaluate the association between various factors, such as the duration of infection, type of virus, mutation of precore/core region in HBV, major histocompatibility class-I, and developing chronic liver diseases among familial HBV carriers. Methods : Chronic carrier status was identified by repeated serological tests for HBsAg at intervals of six months or more. A familial chronic carrier was defined when the disease was observed in a family member over two generations. Two families were recruited, among which a total of 20 chronic HBsAg carriers(11 carriers in No.1, and 9 in No.2 family) were identified. Data on the general characteristics and liver disease status were collected. Identification of the HBV-DNA was successful only for 13 subjects among the 20 carriers. Analysis of viral DNA in terms of subtype, pre-core and core region mutations was carried out. The type of major histocompatibility class-1 for the 13 subjects was also analysed. Results & Conclusions : Seven of 10 chronic HBV carriers of the 1st generation and one of 10 of the 2nd generation were clinical patients with chronic hepatitis, the others, three of the 1 st and nine of the 2nd generation, were asymptomatic carriers. This data indicates that the duration of HBV carriage is one of the major factors for disease severity. The subtype of HBsAg analysed using MBV-DNA identified in 13 carriers were adr, and the pattern of precore nonsense mutation in HBV-DNA was identical among family members, which meads that the same virus strains were transmitted between the family members. The association between the precore or core mutations in HBV-DNA and the disease severity was not observed. While it was suggested that a specific type of MHC class-I may be related to disease progression.

ICE-POP 2018 기간 드롭존데 자료를 활용한 강설 구름의 열역학적 특성

정승필(Sueng-Pil Jung),이철규(Chulkyu Lee),김지형(Ji-Hyoung Kim),양효진(Hyo Jin Yang),윤종환(Jong Hwan Yun),고희종(Hee Jong Ko),홍성은(Seong-Eun Hong),김승범(Seung-Bum Kim) 한국기상학회 2020 대기 Vol.30 No.1

The aircraft observation campaign was performed to investigate thermodynamic conditions of snowfall cloud over the East Sea of Korean peninsula from 2 February to 16 March 2018. During this period, four snowfall events occurred in the Yeongdong region and three cases were analyzed using dropsonde data. Snowfall cases were associated with the passage of southern low-pressure (maritime warm air mass) and expansion of northern high-pressure (continental polar air mass). Case 1 and Case 2a were related to low-pressure systems, and Case 2b and Case 3 were connected with high-pressure systems, respectively. And their thermodynamic properties and horizontal distribution of snowfall cloud were differed according to the influence of the synoptic condition. In Case 1 and Case 2a, atmospheric layers between sea surface and 350 hPa contained moisture more than 15 mm of TPW with multiple inversion layers detected by dropsonde data, while the vertical atmosphere of Case 2b and Case 3 were dry as TPW 5 mm or less with a single inversion inversion layer around 750~850 hPa. However, the vertical distributions of equivalent potential temperature (θe) were similar as moist-adiabatically neutral condition regardless of the case. But, their values below 900 hPa were about 10 K higher in Case 1 and Case 2a (285~290 K) than in Case 2b and Case 3 (275~280 K). The difference in these values is related to the characteristics of the incoming air mass and the location of the snowfall cloud.

한반도 중서부 국지성 집중호우와 관련된 열역학적 특성

정승필(Sueng-Pil Jung),권태영(Tae-Yong Kwon),한상옥(Sang-Ok Han) 한국기상학회 2014 대기 Vol.24 No.4

Thermodynamic conditions related with localized torrential rainfall in the middle west region of Korean peninsula are examined using radar rain rate and radiosonde observational data. Localized torrential rainfall events in this study are defined by three criteria base on 1) any one of Automated Synoptic Observing System (ASOS) hourly rainfall exceeds 30 mmhr<SUP>?1</SUP> around Osan, 2) the rain (> 1 mmhr<SUP>?1</SUP>) area estimated from radar reflectivity is less than 20,000 ㎢, and 3) the rain (> 10 mmhr<SUP>?1</SUP>) cell is detected clearly and duration is short than 24 hr. As a result, 13 cases were selected during the summer season of 10 years (2004-13). It was found that the duration, the maximum rain area, and the maximum volumetric rain rate of convective cells (> 30 mmhr?1) are less than 9hr, smaller than 1,000 ㎢, and 15,000~ 60,000 m3s<SUP>?1</SUP> in these cases. And a majority of cases shows the following thermodynamic characteristics: 1) Convective Available Potential Energy (CAPE) > 800 Jkg<SUP>?1</SUP>, 2) Convective Inhibition (CIN) < 40 Jkg<SUP>?1</SUP>, 3) Total Precipitable Water (TPW) ? 55 mm, and 4) Storm Relative Helicity (SRH) < 120 ㎡s<SUP>?2</SUP>. These cases mostly occurred in the afternoon. These thermodynamic conditions indicated that these cases were caused by strong atmospheric instability, lifting to overcome CIN, and sufficient moisture. The localized torrential rainfall occurred with deep moisture convection result from the instability caused by convective heating.

디자인 전략에 있어서 패밀리 룩 전략은 만능인가?

정승필(Jung, Seungpil),이성근(Yi, Seong Keun) 성신여자대학교 경영연구소 2011 경영관리연구 Vol.4 No.1

이 연구는 스키마의 (불)일치가 평가에 미치는 영향의 결과가 혼재되는 선행연구 결과에서 과연 자동차 산업에서의 디자인 전략과 브랜드 전략과의 스키마 (불)일치가 소비자 태도 평가에는 어떠한 영향을 미칠 것인가를 분석하는 것이다. 이전의 연구를 살펴보면 이전의 스키마, 범주와 완벽한 일치, 극도로 불일치하는 정보 보다는 적당한 불일치하는 정보가 더 평가에 호의적인 결과를 준다고 하였다. 이유는 완벽한 일치 또는 불일치는 인지적 정교화를 하지 않거나, 할 필요가 없다고 생각해서 평가에 호의적인 반응을 보이지 않지만, 적당한 불일치는 적당한 수준의 인지적 정교화 과정을 이끌기 때문에 호의적인 평가를 한다고 하였다. 이 연구는 디자인 전략과 브랜드 전략의 스키마 (불)일치에 따른 실험을 하기 위해서 2세트의 자동차를 만들어서 패밀리 룩이 있는가에 사전 조사를 하여 자동차를 선정하여 실험을 진행하였다. 전체적으로 디자인 전략과 브랜드 전략의 스키마 일치가 소비자의 태도 평가에 긍정적인 영향을 줄 것이라고 기대한 대로 결과 또한 일치할 때가 불일치 할 때 보다 더 호의적인 평가를 받았다. 그리고 (불)일치에 있어서 패밀리 룩이 존재하는 세트가 존재하지 않는 세트보다 더 호의적인 평가를 받았으며, 자동차의 크기에 따른 준중형, 중형, 대형에서도 호의적인 평가의 크기는 차이가 있었지만 동일한 결과를 얻을 수 있었다. There were various preceding studies on the impact of the product information based on categorization theory and the existing consistency/inconsistency among schema on the consumers" information processing and evaluation(Aggarwal and Mcgill, 2007; Meylers-Levy and Sternthal, 1993; Meylers-Levy and Tybout, 1989; Susan, 1982; Fiske and Taylor, 1984; Fiske and Susan, 1982; Mandler, 1982). Until now, the study on evaluation of consistency/inconsistency of schema showed mixed results. As stated in preceding studies, the Schema theory was adopted to analyze the attitude and evaluation on the product according to the level of consistency/inconsistency of the information and consumers" cognitive structure. According to the Schema theory, consumers accept or deny the newly exposed information by their own schema, and perceive the object of the information. In this study, the preceding studies which show mixed results that appropriate level of inconsistency can lead to a more favorable evaluation, rather than extreme inconsistency or complete consistency argued by Meyers-Levy and Tybout(1989), along with Aggarwal and Mcgill(2007)"s study on the consistency was observed, due to various relationship between the inconsistency and consistency and evaluation of schema. During the cognitive categorization, it was approached with theoretical aspects of information processing procedure. Since it was considered that when consumers contacted an information which was consistent with companies" brand strategy and family-look design, the evaluation of cars will differ. The hypothesis that consumers will evaluate more positively on the consistency of companies’brand strategy and family-look design were set and tests were conducted. After testing consumers with mid-sized cars, the hypothesis that consumers will evaluate more positively on the consistency of companies’brand strategy and familylook design was proved, when the mobile industry introduced their new models. When conducting the same test on small-to-mid sized and large cars to generalize the tes results on mid-sized cars, the consumers" evaluation showed the same results, but there were quantitative differences in terms of preference according to the size of the car.

장기간(1997~2013) 라디오존데 관측 자료를 활용한 집중호우 시 연직대기환경 유형 분류

정승필(Sueng-Pil Jung),인소라(So-Ra In),김현욱(Hyun-Wook Kim),심재관(JaeKwan Sim),한상옥(Sang-Ok Han),최병철(Byoung-Choel Choi) 한국기상학회 2015 대기 Vol.25 No.4

Heavy rainfall (>30 mm hr<SUP>−1</SUP>) over the Korean Peninsula is examined in order to understand thermo-dynamic characteristics of the atmosphere, using radiosonde observational data from seven upper-air observation stations during the last 17 years (1997~2013). A total of 82 heavy rainfall cases during the summer season (June-August) were selected for this study. The average values of thermo-dynamic indices of heavy rainfall events are Total Precipitable Water (TPW) = 60 mm, Convective Available Potential Energy (CAPE) = 850 J kg<SUP>−1</SUP>, Convective Inhibition (CIN) = 15 J kg−1, Storm Relative Helicity (SRH) = 160 m<SUP>2</SUP>s<SUP>−2</SUP>, and 0~3 km bulk wind shear = 5 s<SUP>−1</SUP>. About 34% of the cases were associated with a Changma front; this pattern is more significant than other synoptic pressure patterns such as troughs (22%), migratory cyclones (15%), edges of high-pressure (12%), typhoons (11%), and low-pressure originating from Changma fronts (6%). The spatial distribution of thermo-dynamic conditions (CAPE and SRH) is similar to the range of thunderstorms over the United States, but extreme conditions (supercell thunderstorms and tornadoes) did not appear in the Korean Peninsula. Synoptic conditions, vertical buoyancy (CAPE, CIN), and wind parameters (SRH, shear) are shown to discriminate among the environments of the three types. The first type occurred with high CAPE and low wind shear by the edge of the high pressure pattern, but Second type is related to Changma front and typhoon, exhibiting low CAPE and high wind shear. The last type exhibited characteristics intermediate between the first and second types, such as moderate CAPE and wind shear near the migratory cyclone and trough.

영동 대설사례의 레이더 강설강도 추정 관계식에 관한 연구

정승필(Sueng-Pil Jung),권태영(Tae-Yong Kwon),박준영(Jun-Young Park),최병철(Byoung-Choel Choi) 한국기상학회 2016 대기 Vol.26 No.4

Heavy snowfall events have occurred frequently in the Yeongdong region but understanding of these events have trouble in lack of snowfall observation in this region because it is composed of complex topography like the “Taebaek mountains” and the “East sea”. These problems can be solved by quantitative precipitation estimation technique using remote sensing such as radar, satellite, etc. Two radars which are able to cover over Yeondong region were installed at Gangneung (GNG) and Gwangdeoksan (GDK). This study uses radar and water equivalent of snow cover to investigate the characteristics of radar echoes and the Z<SUB>e</SUB>-R relations associated with the 10 Yeongdong heavy snowfall events during the last 5 years (2010~2014). It was found that the heights which the probability of detection (POD) of snow detection by GNG radar is more than 80% are 3,000 m and 1,500 m in convective cloud and stratiform cloud, respectively. The vertical gradient of radar reflectivity is less decreased in convective cloud than stratiform cloud. However, POD by GDK radar are lower than 80% at all layers because the majority of Yeondong observational stations are more than 100 km away from GDK radar site. Furthermore, we examined Z<SUB>e</SUB>-R relation from the 10 events using GNG radar and compared the “a” and “b” obtained from these examinations at Sokcho (SC) and Daegwallyeong (DG). These “a” and “b” are estimated from radar echo at 500 m (SC) and 1,500 m (DG). The values of “a” differ in their stations such as SC and DG are 30~116 and 6~39, respectively. But “b” is 0.4~1.7 irrespective of stations. Moreover, the value of “a” increased with surface air temperature. Therefore, quantitative precipitation estimation in heavy snowfall events by radar echo using fixed “a” and “b” is difficult because these values changed according to those precipitation characteristics.

Synthesis and Characterization of Heat Resistant Polycarbonate-polyester Copolymer

Seung-pil Jung(정승필),김지은,최진식,신경무,허성현 한국고분자학회 2019 한국고분자학회 학술대회 연구논문 초록집 Vol.44 No.2

피부암 환자에서의 서혜부 림프절 곽청술

정평안 ( Pyung An Jung ),정승필 ( Seung Pil Jung ),이정희 ( Jung Hee Lee ),김지영 ( Ji Yeong Kim ),최민영 ( Min Yeong Choi ),이세경 ( Se Kyung Lee ),최준호 ( Jun Ho Choe ),이정언 ( Jeong Eon Lee ),김지수 ( Jee Soo Kim ),남석진 ( S 대한임상종양학회 2011 Korean Journal of Clinical Oncology Vol.7 No.2

목적: 최근 국내에서 발병이 증가하고 있는 피부암 환자에서 시행한 서혜부 림프절 곽청술의 술기를 소개하고 수술에 따른 합병증 및 수술 결과에 대해 고찰하고자 하였다. 방법: 2002년 3월부터 2010년 7월까지 피부암의 서혜부 림프절전이로 서혜부 림프절 곽청술을 시행한 43예의 환자를 대상으로 수술 후 합병증, 생존률, 재발 유무 등을 후향적으로 분석하였다. 결과: 서혜부 림프절 곽청술을 시행한 43명의 환자 중 편평 세포암 8명, 악성 흑색종 35명이었다. 평균 12.6개의 림프절을 절제하였고 평균 2.46개의 림프절에서 전이가 확인 되었다. 수술 후 35예(81.4%)의 환자에서 하지 림프 부종, 피부 괴사, 장액종의 합병증이 발생하였으나 모두 보존적 치료 후 호전되었다. 평균 24.5(3-83)개월의 외래 추적 관찰 기간 동안 20명(46.5%)의 환자에서 재발이 발생하였고 8명(18.6%)의 환자가 사망하였다. 결론: 림프절로 전이된 피부암은 불량한 예후를 보이고 서혜부림프절 곽청술은 많은 합병증을 동반하는 술식이지만 경험 있는 외과의에 의해 적절히 시행된다면 심각한 합병증과 재발을 줄일 수 있다. 국내에서 피부암은 드물 질환이지만 서혜부 림프절 곽청술의 술기 및 술후 경과에 대해 잘 파악하고 있는 것이 이 질환의 치료를 위해 중요하다. Purpose: To evaluate the results and experience of inguinal lymph node dissection in patients with skin cancer. Methods: 43 patients were underwent inguinal lymph node dissection for skin cancer spread to the lymph nodes in SMC between Mar 2002 and Jul 2010. We investigated postoperative complications, recurrence rate, survival rate from their medical records, retrospectively. Results: Among 43 patients, 35 cases were diagnosed as malignant melanoma and 8 were diagnosed as squamous cell carcinoma. 12.6 lymph nodes were retrieved, and 2.46 lymph nodes were metastasized on average. Complications such as lymphedema in lower extremities, skin necrosis, seroma were occurred in 35 patients (81.4%). But most were recovered with conservative management. During 24.5(3-83) months of follow up periods, 20 patients (46.5%) had recurrences of skin cancer and 8(18.6%) of them were expired. Results: Generally, skin cancer spread to lymph nodes shows poor prognosis and inguinal lymph nodes dissection is a procedure resulting in high rate of complications. However, if this is performed properly by experienced surgeons, the recurrence and serious complications could be reduced.

지게차 후방 감지기

정승필(S.P. Jeong),김종영(J.Y. Kim),유세진(S.J. Yu),신재근(J.K. Shin),공여환(Y.H. Kong),정성문(S.M. Jung),안준규(J.K. An),김해지(H.J. Kim) 한국기계가공학회 2015 한국기계가공학회 춘추계학술대회 논문집 Vol.2015 No.10