열방성 액정 고분자를 포함한 고분자 블렌드의 유변학적인 연구

정현욱,정병준,현재천 ( Hyun Wook Jung,Byeong Joon Jeong,Jae Chun Hyun ) 한국화학공학회 1995 화학공학의이론과응용 Vol.1 No.2

일개 응급센터에 내원한 급성 중독 환자군의 특성 비교

정현욱,김호권,정태오,진영호,이재백,Jeong, Hyun-Wook,Kim, Ho-Kwon,Jeong, Tae-O,Jin, Young-Ho,Lee, Jae-Baek 대한임상독성학회 2004 대한임상독성학회지 Vol.2 No.2

Purpose: The purpose of this study is to compare the toxicologic characteristics of two groups of patients with acute intoxication for two different time periods and to make recommendations based on the results of this study. Methods: We reviewed retrospectively the medical records of patients with acute intoxication in our emergency center from June 1997 to May 1998 (group A) and from June 2000 to May 2003 (group B), and we evaluated differences in the epidemiologic and the toxicologic characteristics between the two groups. Results: The ratios of the number of patients with acute intoxication to the total numbers of patients who visited our emergency department were $0.49\%$ and $0.52\%$ for groups A and B, respectively. In both groups many poisoned patients visited our emergency center from 4:00 pm to midnight. The interval between the time of intoxication and arrival at the hospital was significantly shorter in group B. The number of patients transferred to our emergency center was larger in group B. Attempted suicide was the major cause of acute intoxication in both groups. Major toxic substances in both groups were centrally active drugs and insecticides. The number of comatose and mechanically ventilated patients was larger in group B. However, there was no statistically significant difference in the mortality rates. Conclusion: Emergency physicians who manage intoxicated patients should recognize regional characteristics and differences in the toxicologic characteristics of poisoning. In addition, the establishment of a poisoning control center in the regional emergency center is necessary to integrate data control and to enhance specialized management of intoxicated patients.

종자골 절제 후 족무지 관절의 운동 변화

정현욱,김진구,이우천,문정석,서진수,Chung, Hyun-Wook,Kim, Jin-Goo,Lee, Woo-Chun,Moon, Jeong-Seok,Suh, Jin-Soo 대한족부족관절학회 2009 대한족부족관절학회지 Vol.13 No.2

Purpose: Regardless of potential and actual complications, the sesamoidectomy either tibial side or fibular side or both, had been used as a surgical option for various pathologic conditions. The objective of this cadaveric study was to identify the changes of range of motion of great toe after sesamoidectomy. Material and Methods: Eight fresh cadaver legs were used. The angular changes of the hallucal articulations were measured by traction of the flexor hallucis longus tendon at the proximal border of fibro-osseous tarsal tunnel and by traction of the extensor hallucis longus tendon at the superior border of inferior extensor retinaculum. The measurement started at neutral position and proceeded to the maximum for respective tendons. After sesamoidectomy either partial or total, same procedures were repeated and the angular changes were measured. Results: In flexion of great toe, there were significant metatarsophalangeal angular differences at 1 cm traction in total sesamoidectomy and lateral sesamoidectomy. In extension of great toe, there were significant metatarsophalangeal angular differences at more than 2 cm traction in total sesamoidectomy. In other measurements, there were no significant angular changes of the hallucal articulations. Conclusion: The sesamoidectomy resulted in change of motion of great toe. Statistical analysis showed that the significant increases in the initial flexion and maximal extension occurred with total sesamoidectomy and the significant increase in the initial flexion occurred with lateral sesamoidectomy.

매우 불안정한 족관절 골관절병증에서 지주형태 자가 비골을 이용한 관절유합술(1예 보고)

서진수,정현욱,이우천,문정석,최준영,Suh, Jin-Soo,Chung, Hyun-Wook,Lee, Woo-Chun,Moon, Jeong-Seok,Choi, Jun-Young 대한족부족관절학회 2009 대한족부족관절학회지 Vol.13 No.1

Charcot arthropathy of the foot and ankle is characterized by a combination of sensory, motor and autonomic peripheral neuropathy leading to gross swelling, bony destruction and finally severe bony deformity with joint instability. We report a case of very unstable Charcot arthropathy in ankle joint managed with ankle arthrodesis using fibular strut bone grafting technique.

전기 자작 자동차의 문제점 개선 및 제작

임현민(Hyun Min Im),임동수(Dong Su Im),최영광(Young Kwang Choi),심성민(Sung Min Sim),정현욱(Hyun Wook Jeong) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.4

낙동강 중류수계에서 의약물질의 분포특성

이순화(Sun Hwa Lee),정현욱(Hyun Wook Jung),정진영(Jin Young Jung),민혜주(Hye Ju Min),김보람(Bo Ram Kim),박찬갑(Chan Gap Park),오정은(Jeong Eun Oh),Yuu Onoda,Nobuyuki Satou 大韓環境工學會 2013 대한환경공학회지 Vol.35 No.1

본 연구는 낙동강수계의 잔류의약물질을 관리하기 위한 기초자료로 제시되었다. 낙동강 본류에서 Iopromide는 0.0015~ 0.37 μg/L, Mefenamic acid은 0.0087~0.056 μg/L, Diclofenac은 N.D.~0.01 μg/L, Atenolol은 N.D.~0.024 μg/L, Propranolol은N.D.~ 0.0038 μg/L, Lincomycin은 0.0005~0.038 μg/L, Trimethoprim은 N.D.~0.0083 μg/L의 농도범위로 검출되었다. 유역의 하수처리장에서는 대부분 고농도로 검출되었으며, 특히 Iopromide가 최고 5.38 μg/L까지 검출되었다. 축산폐수처리장에서는 린코마이신이 최고 477 μg/L로 가장 높게 검출되었다. 조사결과, 낙동강 본류에서 의약물질은 구미하수처리장과 대구 금호강의 유입으로 농도가 높아져 인구·산업밀집지역의 영향이 큰 것으로 판단된다. 따라서 낙동강의 잔류의약물질을 효율적으로 관리하기 위해서는 금호강과 하·폐수처리장을 지속적으로 모니터링하고 관리하는 것이 바람직한 것으로 사료된다. This study was suggested as fundamental data to control medical materials remained in Nakdong range gauge. The level of Iopromide detected in Nakdong mainstream was 0.0015~0.37 μg/L, Mefenamic acid 0.0087~0.056 μg/L, Diclofenac N.D.~0.01 μg/L, Atenolol N.D.~0.024 μg/L, Propranolol N.D.~0.0038 μg/L, Lincomycin 0.0005~0.038 μg/L, and Trimethoprim N.D.~0.0083 μg/L. At sewage disposal plant in the region, most of them were detected high levels of density. Especially, the level of Iopromide was found the highest up to 5.38 μg/L. At livestock wasted water disposal plant, the level of lincomycin was detected the highest figure of 477 μg/L. As a result, medical materials from Nakdong River mainstream got increasing the concentration due to inflow from sewage disposal plant in Gumi and River Geumho in Daegu, which affects residential and industrial areas significantly. Therefore, to control medical materials remained in Nakdong River efficiently, Geumho River and sewage disposal plants shall be continuously monitored and managed, which is recommendable.

3차원 수치모사를 통한 연료극 지지식 관형 고체산화물 연료전지의 전지 성능에 대한 연결재 구조 효과

황지원(Ji Won Hwang),이정용(Jeong Yong Lee),조동현(Dong Hyun Jo),정현욱(Hyun Wook Jung),김성현(Sung Hyun Kim) 한국청정기술학회 2010 청정기술 Vol.16 No.4

본 연구에서는 유체유동해석프로그램인 Fluent를 이용하여 연료극 지지체식 관형 고체산화물 연료전지(SOFC)에서의 연결재 구조에 따른 성능 변화를 고찰하였다. 실험적 사실과 부합되는 이론적 결과를 확보하기 위해서는 전기적으로 전극과 하나로 되어있는 연결재의 구조가 전지 성능에 어떠한 영향을 미치는지 살피는 것이 중요하다. 두께가 작은 연결재가 단전지 성능을 우수하게 하는 것으로 보아 옴(ohmic) 저항에 직결되는 연결재의 두께가 전지 성능에 있어 주요 변수임을 확인하였다. 일정 두께로 고정된 조건 하에 연결재 폭을 변화시킨 경우, 전지 성능은 상대적으로 큰 차이를 보이지 않았다. 이는 본 연구에서 고려한 SOFC의 관형 구조 특성상 연결재의 폭으로는 원주 방향으로 흘러가는 전류 경로를 효과적으로 단축시킬 수 없기 때문으로 사료된다. Effect of interconnect structure on the cell performance in anode-supported tubular solid oxide fuel cell (SOFC) has been investigated in this study, employing the Fluent CFD solver. For the robust and reliable theoretical analysis corroborating experimental results, it is of great importance to elucidate the role of interconnect which is electrically connected with electrodes on the cell characteristics. From the fact that the thin interconnect provides the enhanced cell performance, it is revealed that the interconnect thickness is a key parameter that is able to effectively control the ohmic resistance. Under the constant thickness condition, the cell performance does not considerably change with the variation of interconnect width. This is because the current passage along with circumferential direction is not effectively altered by the change of interconnect width in tubular SOFC system.

제9장 실험수업을 사고실험으로 대체할 경우 학업성취도에 미치는 영향 -중학교 7, 8 및 9학년 과학교과서 화학단원에서-

하동수 ( Dong Soo Ha ),김대근 ( Dae Keun Kim ),정윤영 ( Yun Young Jeong ),정현욱 ( Hyun Wook Jeong ),박종근 ( Jong Keun Park ) 경상대학교 중등교육연구소 2010 현대교육연구 Vol.22 No.-

중학교 7학년 단원명 ``스스로 움직이는 분자``의 경우, 사고실험 수업이 설명식 이론수업과 강의실 실험수업의 형성평가 결과와 차이가 없거나 오히려 낮은 경향을 나타냈다. 또한 통계적으로 유의미한 차이를 나타내지 못했다. 이는 7학년 학생들의 인지발달 수준이 낮아, 사고실험 수업으로 인해 과학적 개념을 이해할 수 있는 수준에 이르지 못하는 것으로 나타났다. 중학교 8학년 단원명 ``물질의 특성-밀도``의 경우, 사고실험 수업 결과를 이론수업과 비교 했을 때 통계적으로 유의미한 변화가 나타냈다. 이는 사고실험 수업이 학업성취 면에서 설명위주의 이론수업보다는 긍정적인 영향을 준다는 것을 의미한다. 반면, 실험수업과 비교 했을 땐 통계적으로 유의미하지 않게 나타났다. 따라서 학습 효과 면에서 사고실험이 실험수업의 대안으로 가치가 있다고 할 수 있다. 중학교 9학년 단원명 ``나무와 강철 솜의 연소``의 경우, 사고실험 수업이 설명식수업, 실험수업의 형성평가 결과가 유의미한 차이를 나타내지 못하였다. 이는 사고실험 수업이 모든 단원에는 효과적이지 않다는 것을 의미한다. The purpose of this study is to analyze the effect of teaching-learning using a kind of theoretical simulation in ``chemistry`` units of science textbooks for seventh, eighth, ninth graders. Three classes in each graders are chosen and classified into three groups: the first group (the controlled group: A) was taught with the traditional teaching method, the second group (the experimental group: B) was taught with the regular laboratory activity, and the last group (the simulated group: C) was taught with the teaching-learning method using step-by-step explanation for the total experimental procedure in the classroom. After the teaching-learning activity using detailed explanation for the total experimental procedure in the classroom, the mean values of the scientific inquiry, scientific attitudes, and performance assessment by the simulated group were larger than those of the controlled group. Particularly, the mean values of the simulated group are similar to those of the experimental group. There were significant differences between the three groups in the post-test. By the results of the post-test for the simulated group, the theoretically simulated teaching-learning method has significant relationships on the scientific inquiry, the scientific attitudes, and the scientific achievements.

고주파수 영역에서 심매설 접지전극의 접지임피던스

이복희(Bok-Hee Lee),이태형(Tae-Hyung Lee),이수봉(Su-Bong Lee),정현욱(Hyun-Wook Jung),정동철(Dong-Cheol Jeong) 한국조명·전기설비학회 2004 한국조명·전기설비학회 학술대회논문집 Vol.2004 No.11월

A ground resistance is a good index of performance in a grounding system, but it does not reflect the performance in transient states. Recently long vertical ground rods in urban areas are often installed. But because of the inductance of long ground rods the ground impedance at high frequency might be greater than its resistance at low frequency. In this paper, a ground impedance of deeply driven ground rod has been measured in the frequency range from 10kHz to 50MHz. As a result, the ground impedances of a deeply driven ground rods are almost constant at the frequency range less than 100kHz. However at high frequency the ground impedance showed the strong frequency dependance.