P-179 : 밸브진단기를 활용한 관망시스템 내의 유지관리기술 개발

박철한 ( Chul Han Park ),이현동 ( Hyun Dong Lee ),조명훈 ( Pill Jae Kwak ),곽필재 ( Myung Hun Choi ),윤상린 ( Sang Leen Yun ),공명식 ( Myeong Sik Kong ) 한국물환경학회(구 한국수질보전학회) 2013 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2013 No.-

A Case of Atrial Septal Defect (ASD) in a Miniature Schunauzer Dog

박철,최치봉,김일환,박희명,Park, Chul,Choi, Chi-bong,Kim, Il-hwan,Park, Hee-myung The Korean Society of Veterinary Science 2003 大韓獸醫學會誌 Vol.43 No.2

An atrial septal defect (ASD) is congenital heart disease with a communication between the atria, which allows blood to shoot from the atrium with pressure. A 3-month-old female Miniature Schunauzer was referred to the Veterinary Teaching Hospital of Konkuk University for the evaluation of systolic heart murmur. At presentation, the mucous membrane was cyanotic. On physical examination, an ejection-type systolic murmur was auscultated at the pulmonic area. In addition, thoracic radiography showed enlargement of main pulmonary artery and right atrial/ventricular enlargement. Echocardiography revealed dilated right atrium and atrial septal defect. However, mitral and tricuspid valve were still intact and well tolerating. The presence of an ASD was confirmed by identifying flow across the defect with color Doppler imaging. Doppler echocardiography provides a means of non-invasive documentation and quantification of ASD. Complete blood count and serum chemistry were not remarkable. Although large defect was confirmed between the two atrium, the patient did not show any obvious clinical signs of heart failure at this time.

사용자 중심의 SLA 지표 선정 방법론

박철한 ( Chul-han Park ),김상수 ( Sangsoo Kim ),인호 ( Hoh In ) 한국정보처리학회 2006 한국정보처리학회 학술대회논문집 Vol.13 No.2

IT 서비스의 안정적인 공급과 IT 서비스 품질 개선을 이루고자 하는 SLA (Service Level Agreement)에 대해 많은 연구와 시도가 지금까지 진행되어 왔다. SLA 시행에 있어서 측정 지표와 그 평가 기준 선정은 매우 중요하나, 대부분 SLA 측정 지표들은 기술관점의 항목들로 구성되어 있기 때문에, SLA 시행 결과가 사용자 중심이 아닌 서비스 제공자 중심으로 나타나고 있다. 이는 사용자의 불만족을 초래하고 서비스 제공자와의 의사 소통을 어렵게 만들고, 결국 SLA 도입 실패로 이어지는 원인이 되고 있다. 본 연구에서는 기존의 SLA 측정 지표들에서, 사용자 중심의 SLA 측정 지표로 활용할 수 있는 항목들을 BSC 의 인과관계모델을 통해 추출하고, AHP 기법을 통해 SLA 평가 기준들과 측정 지표들에 대한 가중치를 도출하였다. 이를 통하여 사용자 관점의 SLA 지표 선정 방법에 대한 명확한 기준을 제시하였다.

American cocker spaniel dog에서 발생한 삼첨판 이형성 증례

박철,최치봉,서정향,정병현,박희명,Park, Chul,Choi, Chi-Bong,Sur, Jung-Hyang,Chung, Byung-Hyun,Park, Hee-Myung 대한수의학회 2004 大韓獸醫學會誌 Vol.44 No.1

A 2-year-old, female, American cocker spaniel dog presented for a 1-year history of severe ascites, exercise intolerance, tachypnea. At that time, she was in an emergency state. First, the dog was stabilized with oxygen therapy. A diagnosis of cardiac problem was made from history, auscultation, radiograph, ECG, and echocardiography. Jugular pulsation was palpated and a harsh, systolic murmur of tricuspid regurgitation was prominent at the right cardiac apex. Tricuspid valve dysplasia (TVD) was confirmed with echocardiography, accompanying enormous myocardial hypertrophy. The clinical signs had been improved for 8 months with careful therapy and periodic abdominocentesis, and ascites was well controlled. The situation, however, became worse quickly in a week because the client did not follow our management schedule. Finally, she died due to dyspnea and shock. After the spontaneous death, necropsy and histopathological examination were performed and when we opened the thorax, a significantly large heart was observed. On histopathological findings, grossly myocardium appeared pale initially, then progressed to yellow and white. Microscopically, there was an extensive hemorrhage along with loss of myocardial striations. Interstitial fibrosis and various degenerative alterations in myocytes were also present.

허구적 대상의 존재론적 특성

박철은(Chul-Eun, Park) 한국외국어대학교 철학문화연구소 2010 철학과 문화 Vol.21 No.-

허구적 대상은 존재하는가? 없다면 왜 없는가? 그리고 있다면 그것은 어떠한 것인가? 그리고 허구 대상은 지시 가능한 대상인가? 허구적 대상에 대해 묘사하는 명제들은 진리값을 갖는가? 허구적 대상을 논리적으로 다룰 수 있는가? 그것의 논리적 특징은 무엇인가? 이 질문들에 대한 러셀, 설, 라일, 파슨스, 반 인와겐, 월터스토프, 우즈, 크립키, 도넬란, 루이스 등의 상이한 답변을 소개하고 그 이론적 장, 단점을 간략하게 고찰했다. Does exist a fictional character? If it doesn't exist, why doesn't it exist? and if It is, what is it? Besides, can fictional character be referenced? Does propositions that describe fictional character have truth value? Does fictional character function logically? what it's logical feature is? I present different answers to those questions of Russell, Ryle, Parsons, van Inwagen, Wolterstorff, Woods, Kripke, Donnellan and Lewis, and consider their theoretical merits and demerits briefly.

리튬이온 배터리의 열관리가 전기자동차 주행거리에 미치는 영향

박철은(Chul-Eun Park),유세웅(Se-Woong Yoo),정영환(Young-Hwan Jeong),김기범(Kibum Kim) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.5

전기자동차에 사용되는 리튬이온 배터리의 성능은 배터리 온도에 따라 큰 차이를 보인다. 본 논문에서는 유한차분법을 이용하여 배터리의 발열량에 따른 배터리의 온도변화를 평가하고, 배터리의 충전량, 내부저항 및 전압변화를 조사하였다.이 배터리 모델을 1차원 해석 프로그램인 AMESim과 연동하여 전기자동차가 NEDC 모드로 주행 시, 배터리의 온도 변화에 따른 전기자동차의 주행거리를 산출하였다. 배터리는 온도가 25℃ 이하로 감소하면 내부저항이 증가하기 때문에 발열량이 증가하여 주행거리는 줄었다. 또한, 배터리의 온도가 25℃ 이상이 되면, 배터리의 충전량이 감소하여 배터리의 성능이 떨어지고 그 결과로 주행거리가 줄었다. 배터리의 성능을 최적으로 유지할 수 있는 온도인 25℃를 기준으로 배터리의 온도가 -20℃와 45℃일 때, 전기자동차의 주행거리는 각각 33%와 1.8% 감소하였다. 배터리의 최적 온도를 유지하기 위해 효율적인 배터리 열관리를 통하여 저온에서는 가열, 고온에서는 냉각이 이루어져야 한다. 해석 결과 외기온이 -20℃인 경우 500 W의 열을 공급해주어야 하며, 외기온이 45℃ 경우에는 냉방을 통해 250 W의 열을 방출해줌으로써 배터리 구동의 최적 온도인 25℃를 유지할 수 있다. The performance of lithium ion batteries used in electric vehicles (EV) varies greatly depending on the battery temperature. In this paper, the finite difference method was used to evaluate the temperature change, state of charge (SOC), internal resistance, and voltage change of the battery due to heat generation in the battery. The simulation model was linked with AMESim to calculate the driving range of an EV traveling in New European Driving Cycle (NEDC) mode. As the temperature dropped below 25℃, the internal resistance of the battery increased, which increased the amount of heat generated and decreased the driving range of EV. At battery temperatures above 25℃, the driving range was also decreased due to reduced SOC that deteriorated the battery performance. The battery showed optimal performance and the driving range was maximized at 25℃. When battery temperatures of -20℃ and 45℃, the driving range of EV decreased by 33% and 1.8%, respectively. Maintaining the optimum battery temperature requires heating the battery at low temperature and cooling it down at high temperature through efficient battery thermal management. Approximately 500 W of heat should be supplied to the battery when the ambient temperature is -20℃, while 250 W of heat should be removed for the battery to be maintained at 25℃.

연안역 동물 플랑크톤 시료의 변이: 반복 채집 및 시간별 채집의 필요성

박철,Park, Chul 한국해양학회 1989 韓國海洋學會誌 Vol.24 No.4

To examine the sample variability of zooplankton, samples were collected at two stations in the nearshore off Anhung (Chungnam, Korea), using a NORPAC net (76 Cm diameter, 0.333 mm mesh size) for two days, April 5 and 6, 1989. The net was towed vertically to eliminate the source of variation due to vertical migration. During the period of 6 hours, triplicate sampling was done every one or two hour at each station. Species composition and abundances at two stations were not so different, but the abundances at each station varied greatly with respect to sampling time. Greater abundance at one sampling time ranged 2.3-8.7 times of smaller abundance at another sampling time. At the level of ${\alpha}=0.05$, however, mean abundances of different sampling time did not differ significantly from each other due to the large variance. It was believed that the large variance was caused by the time dependent effect of patchiness of which parameters were varied with time because of sea water movement. From the variation within the triplicate samples, it was considered that the abundance data obtained from single tow were not significantly different from the data in the range of 50-200% of those from single tow. From these results, the necessity for the replicate and time dependent sampling was indicated. In the nearshore like the sampling site of this study, it seemed to be better to reduce the number of stations for the replicate and time dependent sampling though the proper sampling scheme was to be decided based on the goal of the study.

계절과 염분 변화에 따른 섬진강 하구역 동물플랑크톤의 분포 변화

박철,이평강,양성렬,Park, Chul,Lee, Pyung-Gang,Yang, Sung-Ryull 한국해양학회 2002 바다 Vol.7 No.2

섬진강 하구역에서 염분 경사에 따른 동물플랑크톤의 종 조성과 양적 분포를 계절별로 조사하였다. 하구역이라 하나 전 계절 연안역에서 흔히 볼 수 있는 종들이 주를 이루고 있었으며, 전 계절 담수 유래종은 매우 미약하였다. 평균 총량으로 봄에 3,000 개체/m$^3 $이상의 많은 개체수가분포하며 여름에 다소 감소하나 여전히 많은 개체수 분포를보이고 가을에 약 500 개체/m$^3$수준으로 감소하였다가 겨울부터 증가하는 계절적 변동을 보였다. 염분 범위에 따라 저염분역(염분 5 psu이하), 중염분역(5~18 psu), 고염분역(18 psu 이상)으로 나누어 살펴보면, 계절의 진행에 따라 가장 많은 양의 동물플랑크톤이 출현하는 염분역이 일정하게 유지되지 않고 있으며, 종 조성에서도 계절별 지역별로 차이를 보였다. 가을철에는 요각류가 저염분역에서 우세하나 고염분역으로 가면서 갑각류 이외의 종들이 우세하였고, 겨울철에는 전 지역에서 요각류가 우세하였다. 봄철에는 대상 해역이 중염분역과 고염분역으로만 구분되었는데, 중염분역에서는 요각류, 고염분역에서는 야광충이 우점하였다. 여름철에는 저염분역에서는 요각류가, 중염분역과 고염분역에서는 야광충이 더 많았다. 요각류 군집만을 대상으로 염분 구역별 주요 우점 종을 열거하였고, 이들의 출현수온, 염분 범위와 가장 많은 출현량을 보인 지역의 수온 염분을 제시하였다. 이들 요각류의 염분 내성 범위는 매우광범위하게 나타나 지시종의 개념이 요각류에 있어서는 출현 유무라는 정성적인 개념보다는 양의 많고 적음이라는 정량적인 개념에서 사용되어져야 할 것으로 여겨졌다.이 맞닿는 지역으로 Sternaspis scutata가 가장 우점하였다. 과거의 연구와 비교해 보면, 저서다모류군집은 출현종수, 서식밀도와 우점종에 있어서 큰 변화를 보였다. 과거의 조사결과에서는 우점종이 Sternaspis scutata와 Eteone longa이었으나, 본 조사에서는 이 종들의 서식밀도가 감소하였다. 반면에 잠재적 유기물 오염 지시종으로 알려진 Lumbrineris longifolia와 Heteromastus filiformis가 서식밀도는 낮지만 새롭게 우점종으로 대두하였다. 이러한 사실들로 볼 때, 득량만은 한국의 다른 만들과는 달리 아직까지 오염이 덜한 해역인 것으로 사료되나, 환경관리에 주의를 요하는 것으로 판단된다. 공간분포는 다양한 무기 환경 요소들 가운데 일차적으로 저층수의 염분에 의해 영향을 받으며, 이차적으로 퇴적상에 의해 영향을 받고 있음을 알 수 있다.한 결과, $CH_4$ 농도의 증가율이 무안과 태안 지역에서 각각 연간 16.5, 14.8 ppb로 가장 높게 관측되었다. 관측점 주변에 복잡한 배출원의 작용이 가능하다는 점을 감안하여, 무안지역의 $CH_4$ 농도변화와 풍향과의 연계성을 비교해 보았다. 이 결과에 의하면, 동풍계열의 풍계가 나타날 때 고농도의 값이 나타났으며, 청정한 공기가 유입되는 남서풍의 풍계시에는 비교적 낮은 $CH_4$ 농도가 유지되었다. 이처럼 $CH_4$의 장주기적 분포특성은 연구대상지역의 복잡한 배출${\cdot}$소별작용과 연계되어 매우 다양하고 독특한 형태를 띠고 있음을 The seasonal variation in species composition and abundance distribution of zooplankton was studied in the Seomjin river estuary along the salinity gradients. In this estuary, marine taxa predominated in all seasons and very limited number of freshwater species appeared. The total abundances showed a seasonal fluctuation. The highest total abundance appeared in spring with over 3,000 individuals/m$^3$. In summer, the high abundance was sustained although it decreased a little. The abundance was minimal in fall with about 500 individuals/m$^3$. When the study area was divided into three salinity regimes, oligohaline (salinity less than 5 psu), mesohaline (5${\sim}$18 psu), and polyhaline zone (over 18 psu), the zone of high abundance as well as the composition of zooplankton community in each salinity regime changed seasonally. In fall, marine copepods predominated in oligohaline zone while marine species other than crustaceans dominated in polyhaline zone. However, in winter copepods predominated in all area. In spring and summer, holozoic dinoflagellate Noctiluca scintillans dominated in higher salinity regimes. We listed major copepod species of each salinity regime for each season with the ranges of water temperatures (T) and salinities (S) of their occurrence. T, S's of maximum abundances of those major copepod species were also reported. The observed very wide tolerance ranges of major copepod species for salinity suggested that the concept of 'indicator species' should be used in quantitative context rather than qualitative.

아산만 요각류 Calanus sinicus 의 알 생산

박철,이평강 ( Chul Park,Pyung Gang Lee ) 한국수산과학회 1995 한국수산과학회지 Vol.28 No.1

Seasonality in biomass and egg production was investigated for Calanus sinicus, one of the major copepods in Asan Bay, Korea. Biomass of this species in this restricted embayment showed only one peak in spring, but egg production showed two peaks, spring (April and May) and fall (September). Average egg productions during the spawning seasons were 16.3 eggs/female/day (spring) and 7.6 eggs/female/day (fall) with maximum egg production of 39.0 eggs/female/day. Food concentrations in this bay measured in terms of particulate organic carbon (POC) were relatively high around the year, and correlation between egg production and POC was not significant. With the food provided sufficiently animals produced a lot of fecal pellets, but egg production was ceased after several days of experiment. From these results it was believed that egg production in this bay was influenced by food quality and feeding history rather than food concentrations. Habitat temperatures also seem to have influence on egg production from the facts that no egg was produced at extreme habitat temperatures, although the correlation between the two was not significant. In this bay, two generations with different time periods seem to progress yearly. Distribution was coupled with life cycle only at certain time of the year. During the other periods predation pressure by the higher trophic levels and shift of the centers of the distributions toward deeper outer bay seemed to be responsible for the observed distribution and egg production of this species in this bay. Comparing with the previous reports, migration of fairly long distance and continual reproduction seemed possible for this species.

Day-Night Differences in Zooplankton Catches in the Coastal Area of Active Tidal Mixing

박철,PARK, CHUL The Korean Society of Oceanography 1990 韓國海洋學會誌 Vol.25 No.3

For the test of zooplankton's ability to migrate vertically in the coastal area of active tidal mixing, day-night differences in zooplankton catches were examined. Some taxa such as large Copepods, My side, chaetognatha and Bivalve larva showed high abundances at surface layer at night suggesting the presence of vertical migration even in this shallow coastal area of active tidal mixing. Previously used methods of sampling were reviewed to find a proper sampling method in the Korean western coastal area.