동진강 수계 농업용수 수질평가

한수곤,최정식,문영훈,엄미정,김갑철 한국환경농학회 2000 한국환경농학회지 Vol.19 No.2

동진강 수계의 수질현황을 파악하기 1994∼1998년 까지 4∼9월에 월 1회에 걸쳐 5개년간 조사한 결과를 요약하면 다음과 같다. 월별로는 빗물에 의한 희석효과로 7, 8월에 수질이 가장 양호하였으며, 4월이 다소 불량하였으나 수도생육 피해 한계농도에는 미치지 못하는 수준이었다. 지점별 수질현황은 생활하수 유입지인 정읍천과 지천의 폭이 좁은 원평천의 무기성분 함량이 높았으며 동진천 상류지역에서 가장 양호하였다. 연도별 현황은 '94년 이후 '95년까지는 수질이 악화되는 경향을 보였으나 '95년 이후로는 각 성분 함량이 낮았지는 등 점점 양호해지고 있으며 COD함량으로 볼 때 특히, 정읍천의 수질이 개선되고 있음을 알 수 있었다. 양이온과 음이온의 총당량온 4월에 가장 높았고 7, 8월에 가장 낮았으며 양이온/음이온의 당량비는 5월에 높았고 7월이 가장 낮았으며 지점에 따라서는 총당량은 정읍천, 원평천, 동진천 하류, 중류, 상류의 순위였으며 양이온/음이온 총당량 비율은 원평천이 상대적으로 작은 수치를 보였지만 지역간 큰 차이는 보이지 않았다. 수질 중 각 성분 상호간의 상관관계를 보면, 대개의 성분 상호간에 유의성이 높게 나타났으나, NO₄^--N는 대개의 성분과 유의성이 없었고, PO₄^(3-)-P도 COD, NH₄^+-N, NO₃^--N, SO₄^(2-)과는 유의성을 보이지 않았다. This study was conducted to monitor the irrigation water qualities along Dong-Jin river watershed. The water quality was surveyed at 6 sites from April to september during 1994∼1998. And the results were as follows : In July and August, water quality was better than that of any other months due to dilution with rainwater. Whereas, it became worse in April but it involved lower contents than limitted contents affected to the crop damage. Content of inorganic components was higher at Jeong-up and Won-pyeong stream. The reason for it that Jeong-up stream was deteriorated with sewage water from Jeong-up city, and Won-pyeong stream has narrow width. Water quality in upstream of Dong-Jin river, was evaluated best conditions in all sampling sites. For investigated period, water quality got worse from 1994 to 1995 but it was getting better to 1998 after 1995, especially at Jeong-up stream. The total equivalent of cation and anion was the highest at April through all months and at Jeong-up stream in sampling sites. Equivalent ratio of cation to anions(∑C/∑A) was higher at May than any other months and lower at Won-pyeong streams than any other sites. The value of most inorganic components was highly correlated with those of other components. But the value of NO₃^--N was not correlated with that of most components, and PO₄^(3-)-P was not correlated with COD, NH₄^+-N, NO₃^--N, SO₄^(2-_.

에어컨 냉각 팬용 브러쉬레스 DC 전동기의 역기전력 분석에 대한 연구

조정현,김지현,정정원,황흥식,이치우 경성대학교 공학기술연구소 2012 공학기술연구지 Vol.18 No.-

Compared to conventional dc motors having the combination of commutators and brushes, a brushless DC (BLDC) motor is one of the highly efficient motors due to its electrical commutation without a brush, and this feature allows the BLDC otor to be more suitable for an application requiring no maintenance due to mechanical wear between a commutator and a brush. Also, the BLDC motor has a few benefits over both a dc motor and an induction motor such as high dynamic response, high efficiency, logn life span, and low noise in wide speed-torque region. This paper investigates the variation of voltage induced in phase windings in a BLDC motor in several cases with respect to stack length, steel grade, and coil material. This study is numerically conducted and it is verified from the theoritical point of view by comparing the result of simulation with that of experimental measurement.

사염화탄소로 유발된 간손상에서의 효소 활성도의 변화로 본 홍화자 분획물의 간손상 보호 작용

정춘식,정기화,정정숙 德成女子大學校 藥學硏究所 1999 藥學論文誌 Vol.10 No.1

본 연구소에서는 사염화탄소로 유발된 간손상에 대한 홍화자 메탄올 추출물과 이를 계통 분획한 분획물의 보호 효과를 이미 보고하였다. 본 실험에서는 혈장과 조직 생화학적 분석으로 홍화자 분획물의 간보호 효과를 확인하며, 간보호 작용에 대한 기전을 살펴보기 위하여 약물 대사 효소에 미치는 영향을 측정하였다. 홍화자 butanol subfractions 중 BS-5 분획물은 CCl_4로 간손상을 유발시킨 흰쥐에서의 혈장 ALT와 AST 활성과 간조직 중 cholesterol and triglyceride를 감소시켰으며, 이러한 BS-5 분획물의 CCl_4로 유발된 간손상에 대해 보호 작용은 cytochrome P450 감소와 glutathione S-transferase의 활성 증가에 기인된 것으로 생각된다. Previous studies have shown that methanol extract and its butanol fraction of Carthamus tinctorius L. Semen have the hepatoprotective effect on the CCl_4-induced hepatotoxicity. The hepatoprotective effect of subfractions has been evaluated by analyzing blood and hepatocyte biochemical analyses and biotransformation enzyme analyses. Treatment of BS-5 subfraction has significantly decreased the activities of alanine aminotransferase and aspartate aminotransferase. In addition, the levels of cholesterol and triglyceride in liver have been decreased as compared with that of CCl_4 treated rats. The hepatoprotective effect of BS-5 subfraction on the CCl_4-induced hepatotoxicity would be mediated of the attenuation of the level of cytochrome P450 and the enhancement of the activity of glutathion S-transferase.

〈홍계월전〉 원전 탐색

정준식(Jeong, Jun-Sik) 한국어문학회 2017 語文學 Vol.0 No.137

The purpose of this study is to trace back the production and distribution of of The Tale of Hong Kyewǒl. Often the editions of the story not only show variations but also major flaws in the plot, and therefore this article aims to compare diverse versions of the story and then identify the most reliable and complete edition among them. The Tale of Hong Kyewǒl contains the theme of prephecy, appearing in the text for the two times, following the four battle scenes.. Therefore, the study defines the complete edition that contains both the description of the two major warring parts and the scene of prophecy, which structure is repeated in the latter half of the story and fully complete the story,. Until now, this kind of research has been understudied, and it is important to idenfity the original edition among many versions circulating in the market in order to help readers fully grasp the storyline without any logical leaps or interruption. The effort to eliminate the flawed text was launched a century ago. In 1861 Dankook University’s 96 changpon was produced and in 1961 Yonsei University 29 changpon was produced. In this perspective, there are somedifferences among the different versions of Dankook University 103 changpon edition but they commonly share the narrative structure of three battle scenes, which were settled after the debates among scholars. After the process, Dankook University 103 changpon and Yonsei University 29 changpon are now conceived of as the most complete and comprehensive one. The major flaws in the editions are found in the following two cases. First, the complete version of The Tale of Hong Kyewǒl presents ‘prophecy 1’ and ‘prophecy 2’ together. In considering that the battle scenes are usually presented, followed by the scene of prophecy, some editions contains only one battle scene, so called ‘Attack at the Path for Post.’ In comparison to the complete edition of The Tale of Hong Kyewǒl, some versions miss the last battle scene, nor does mention that Master Kwak gives two beads to Pyǒngguk with a letter to promise a meeting in three years. Among Dankook University 103 changpon versions, Dankook University 96 changpon is the only version that satisfies the two conditions for the complete storyline. Therefore, this study argues that Dankook University 96 changpon of “Kyewǒl chǒn” should be regarded as the most faithful and complete version of The Tale of Hong Kyewǒl.

모 주물공장 근로자의 작업공정별 분진폭로량, 자각증상 및 건강진단판정 비교

이범식,조영채,변정식,김동현,원선혜,김정윤 忠南大學校 環境問題硏究所 1995 環境硏究 Vol.13 No.-

The relationship among dust exposure dose, special health diagnosis results and subjective symptom questionaire survey for 109 casting foundry workers supervised by a local laber office has been studied from august to october 1993. Subjective symptom, dust exposure dose and health examination evaluation of respective working processes have been analized and concluded as follows; 1. Metal fume concentration in melting process measured 3.21±1.46㎎/㎥ is under threshould limit value(TLV;5.0㎎/㎥), casting sand dust measured in molding and desanding process is 5.8 ±3.41㎎/㎥ and 9.69 ±2.64㎎/㎥ which is 3-5 times higher than TLV(2.0㎎/㎥), metal fume, welding fume and metal dust in finishing process measured 9.34 ±1.32, 13.73 ±16.97 and 10.17 ±3.50㎎/㎥ respectively, which are also 2-3 times higher than TLV(5.0㎎/㎥). 2. The complain rate subjective symptoms appeal evaluated for finishing process are 35.9%, 46.2%, 27.2% and 42.2% for eye smptoms, respiractory, skin, general symptom respectively and the rates above express the highest values and the complain rates for melting process are 24.4%, 37.5% and 35.7% for eye smptoms, respiratory and mental system respectively and for molding and desanding it is 24.3%. 3. Perceived occupational disease rate is found 0.9% with are out of 109 worker surveyed who have been exposed in metal fume of finishing process. 4. 33.0% of workers surved are found to require close examination, the worker of hepatopathy suspected are 21.4% which is the highest and 3.7% for circulatory disturbance suspected. 5. The statistically significant variables in general chracteristics that affect health examination evaluation are smoking(P<0.001), respirator put-on (P<0.05) and working career(P<0.05). 6. Cough(P<0.001), "headache"(P<0.05) and "easily skin exchange by slight stimulation" (P<0.05) are statistically significant to the subjective symptom variables affect health examination evaluation.

응급실에 내원한 환자에서 어지럼증의 원인과 임상양상의 분석

문원식,정경운,위준선,문정미,전병조,김용권,소정일,류진호,허탁,민용일 대한응급의학회 2001 대한응급의학회지 Vol.12 No.3

Background: Recently, The number of patients who have been complaining of the vertigo or dizziness has been increasing due to rapid growth of elderly population and senile disease. The differentiation of dizzy patients is not familiar to most emergency physicians. This study was designed to differentiate true vertigo and to investigate the clinical difference among central vertigo, peripheral vertigo, and other causes of dizziness. Methods: The authors analyzed the cases of 237 dizzy patients who visited the emergency department of Chonnam University Hospital during the recent 2 years. For the base of dizziness, associated past illnesses, severity, nystagmus type, and the causes of central and peripheral vertigo. Results: Female patients were 142(59.9%) and male patients were 95(40.1%). The most common age group was the 6th decade. The origin of dizziness was classified as peripheral cause(25.3%), central cause(32.9%), and others(41.8%). As to nature of the dizziness, the rotatory sense was dominant in peripheral vertigo and the floating sense and blurred vision in central vertigo. Peripheral vertigo was triggered by position change of head and body, and central vertigo by the eye movement. Audiograms I showed that most patients with central vertigo had normal hearing, but 46.7% of thoswith peripheral vertigo had an abnormal hearing disturbance. Nystagmus was more prevalent in peripheral vertigo Conclusion: History taking and physical examination played an important role in the diagnosis of dizzy patients. An important part of the diagnosis of a dizzy patient could be to evaluate the peripheral origin, the central origin and others causes. Because central vertigo may be associated with a significant neurological pathology, spectral radiological studies, including MRI and CT, are mandatory to rule out a devastating brain lesion.

숙대본 A를 활용한 <김희경전>의 정본 구축 방안

정준식(Jeong, Jun-sik) 한국어문학회 2016 語文學 Vol.0 No.132

The purpose of this study is to establish the original copy of <Gimhuigyeonjeon>, positively accepting results of previous research on different versions, mainly with Sukdae-bon A, the complete edition of its initial series and with the Nakjil-bon of Kim Donguk-bon A, B, D, E, and F as sub-materials. The discussions are summed up as below: Since Sukdae-bon A introduced lately was found to be the one and only complete edition of the initial series, it would be more reasonable to rename the initial different versions, previously referred to as ‘Kim Donguk-bon series’ as ‘Sukdae-bon A series’. Accordingly, the different versions of <Gimhuigyeongjeon> need to be rearranged as Sukdae-bon A series, Gukjung-bon A series, and Seongdae-bon series. Then ‘Sukdae-bon A series’ reflects faithfully the contents of the original, but hardly indicates any significant alternation. On the other hand, ‘Gukjung-bon A series’ is characterized as different versions of the intermediate period unlike ‘Sukdaebon A series’ while taking some processes of omission, change, or addition in the middle of them. Lastly, ‘Seongdae-bon series’ is equipped with the aspects of the different versions of the latter period by showing some combined aspects of the two previous series and omitting the latter part as a whole. Furthermore, the lately discovered Sukdae-bon B and Sajaedong-bon evidently show that Seongdae-bon was not handed down unilaterally but transmitted dynamically, divided into two types; ‘Seouldae-bon type’ and ‘Seongdae-bon type’. Since all the 10 complete editions of <Gimhuigyeongjeon> have been found with partial flaws, it is crucial to establish the original copy for more wholesome discussion. This study, thus, taking Sukdae-bon A, the one and only complete edition of the initial series as the main material, attempts to find ways to realize the original copy with reference to Kim Donguk-bon A, B, D, E, and F, the nakjil-bon of the same series to correct flaws found in the different versions.

보존적 치료로 회복된 망경색에 의한 급성복증 1예

김정념,이숭환,김정식,김진호,배윤오,박성규,윤상정,한현영,이헌영 충남대학교 의과대학 의학연구소 2003 충남의대잡지 Vol.30 No.1

Omental infarction, the end result of impaired perfusion to the greater omentum, is a rare benign self-limiting clinical entity. The main clinical symptom is non-specific localized abdominal pain with a moderately raised white blood cell and erythrocyte sedimentation rate. These findings often mimic an abdominal surgical emergency. This condition is often misdiagnosed as acute appendicitis or cholecystitis. The characteristic feature of CT scan and ultrasonography provide non-invasive diagnosis in most patients with omental infarction. We report a case of patient whose CT scan showed the characteristic finding of omental infarction. The patient was improved spontaneously only with conservative care.

불완전 전뇌 허혈후 소생의 백서 모델을 이용한 재관류 뇌혈류량과 허혈성 뇌조직 손상도와의 관계

서정필,송근정,황태식,정연권,신백효,김승호 大韓應急醫學會 1999 대한응급의학회지 Vol.10 No.2

Background: Experimental data indicate that low-flow reperfusion following prolonged cardiocirculatory arrest may aggravate early cerebral microcirculatory reperfusion disorders. We investigated the influence of cerebral reperfusion flow change to the ischemic histopathologic damage of brain tissue after incomplete forebrain ischemia in rats. Materials and method: Anesthetized Sprague-Dawley rats were undergone ligation of both internal carotid artery by microvascular clamp for 10 minutes. After release of the clamp, reperfusion was started with several different flow levels (0, 10, 20, 30, 50, and 100%) of internal carotid artery comparing to pre-clamping phase using flowmeter. After 15minutes of reperfusion, rat brains were prepared by perfusion-fixation with 3% formaldehyde. Under light microscopic examination of Hematoxylin-Eosin stained tissue slide, histopathologic damage was examined at cortex, putamen, and hippocampus regions. Categorical hisotopathologic damage scores were derived in each regions by manual counts of ischemic neurons. Result: The histopathologic damage scores were 0, 10.2±0.5, 7.6±1.5, 5.9±1.4, 5.0±2.8, 3.5±0.7, and 1.0±0.0 in control, 0, 10,20, 30, 50, and 100% reperfusion groups, respectively(p<0.05). Conclusion: Our results showed significant increment of brain histopathologic damage scores along with decreasing amount of cerebral reperfusion flow after incomplete forebrain ischemia. We believe restoration of reperfusion flow to pre-ischemic level would be a critical component in attenuation of brain ischemic damage.

홍화자 분획물이 사염화탄소 유발 간손상 흰쥐에서 지질과산화와 oxygen free radical 제거 효소 활성도에 미치는 영향

정기화,정춘식,정정숙 德成女子大學校 藥學硏究所 1999 藥學論文誌 Vol.10 No.1

저자들은 사염화탄소로 유발된 간손상에 대한 홍화자 메탄올 추출물과 이를 계통 분획한 분획물의 보호 효과를 이미 보고하였다. 본 실험에서는 홍화자 분획물의 간보호 작용에 대한 기전을 살펴보기 위하여 지질과산화와 oxygen free radical 제거 효소 활성을 측정하였고 조직병리학적 분석을 통하여 간보호 효과를 확인하였다. 홍화자 BS-5 분획물은 CCl_4로 간손상을 유발시킨 흰쥐에서 superoxide dismutase의 활성도를 유의적으로 증가시켰으며, in vitro에서의 1, 1-diphenyl -2-picrylhydrazyl radical를 직접적으로 제거하였다. 또한 조직병리학적 분석에서도 홍화자 BS-5분획투여군은 CCl_4 투여로 인한 중심정맥 주변의 ballooning degeneration, 염증 세포 침윤 및 괴사를 완화시켜 간손상 보호 작용을 나타내었으며, 이는 free radical scavenging 작용에 의한 것으로 생각된다. Previous studies have shown that methanol extract and its butanol fraction of Carthamus tinctorius L. Semen have the hepatoprotective effect on the CCl_4-induced hepatotoxicity. The hepatoprotective effect fo the subfractions of butanol fraction has been evaluated by analyzing oxygen free radical scavenging enzyme activities and histopathological examinations. In BS-5 subfraction treated group, the activity of superoxide dismutase has been significantly increased as compared with that of CCl_4 treated rats. Antioxidant activity has been evaluated by the examination of the scavenging ativity against 1,1-diphenyl-2-picrylhydrazyl radical. BS-5 subfraction has shown strong antioxidant activities. The histopathological examination showed that the treatment of BS-5 subfraction has relieved the ballooning degeneration of hepatocytes which had been generated by CCl_4. It appears that the protective effect of BS-5 subfraction would be mediated of the attenuation of lipid peroxidation by acting as a free radical scavenger. which were based on the increase of superoxide dismutase activity.