단일 고압산소치료센터에서의 감압병 환자에 대한 치료 경험

이정현,정상구,이유진,오세현,강희동 대한응급의학회 2022 대한응급의학회지 Vol.33 No.6

Objective: Hyperbaric oxygen therapy (HBOT) is the most crucial treatment for decompression sickness (DCS), which needs to be administered as swiftly as possible. This study evaluates the therapeutic responses of DCS patients and analyzes the major factors for clinical outcomes. Methods: This is a retrospective cohort single-center study on patients who arrived at our hospital’s emergency department for diving-related symptoms and were diagnosed with DCS and administered HBOT. Results: Totally, 337 patients were enrolled from June 2015 to May 2020. The proportion of SCUBA diving, rapid ascent, and inter-facility transport cases was higher in the recreational group, with a longer lag time from symptom onset to HBOT. The professional group had a higher proportion of cases with previous DCS history, total diving time, bottom time, in-water decompression, and repetitive diving. Examination of treatment outcomes revealed more type I cases and a shorter lag time from symptom onset to HBOT in the complete recovery group. Conversely, the incomplete recovery group had a higher proportion of type II cases and aggravation of symptoms before HBOT was administered. Conclusion: DCS can occur regardless of professional or recreational divers. Both groups showed a similar level of severity. It is recommended that recreational divers should be cautious of accidents related to safety (such as rapid ascent) and receive swift treatment in case of the onset of symptoms. Occupational divers need more active efforts to get HBOT rather than just performing in-water recompression or home O2 therapy.

국산 의료기기 사용률과 사용자 및 관리자 인식 조사를 통한 국산 의료기기 개선 방안

이정현 한국재활복지공학회 2017 재활복지공학회논문지 Vol.11 No.4

The Korean medical device industry has increased dramatically due to various investments in the domestic medical device industry and the introduction of new technologies, but the domestic medical device usage rate in great hospital is still low. In this paper, improvement point for domestic medical device was suggested by domestic medical device usage rate and user and manager 's perception survey in great hospitals in Korea. To do this, a survey on the types of medical devices and domestic medical device usage rates were conducted at four national university hospitals in Korea. From this results, the priority survey medical devices were selected. Improvements of Korean medical devices were suggested by failure mode analysis and user awareness surveys for the priority survey medical devices. 국산 의료기기 산업에 대한 다양한 투자와 신기술 도입에 따라 국내의료기기 산업은 비약적인 증가를 하고 있으나 국내 대형의료기관의 국산의료기기 사용률은 여전히 저조한 것으로 조사되고 있다. 본 논문에서는 국내 대형병원에서의 국산 의료기기 사용률과 사용자 및 관리자의 인식조사를 수행하여 국산의료기기의 개선점을 제시하였다. 이를 위해 국내 4곳의 국립대학교병원을 대상으로 전체 의료기기의 종류와 국산 의료기기 사용률에 대한 조사를 진행하고 이를 바탕으로 의료기기 중 중점조사 대상 의료기기를 선정하였다. 중점조사대상 의료기를 대상으로 고장통계와 사용자 인식조사를 수행하였으며 이를 통해 중점조사대상 의료기기의 개선사항을 제시하였다.

연소후 이산화탄소 포집용 고분자 분리막 공정에서의 운전 변수에 대한 고찰

이정현,오웅진,이다훈,문종호,김진국,이성훈,여정구 한국막학회 2015 한국막학회 총회 및 학술발표회 Vol.2015 No.11

The carbon capture and storage (CCS) technology from industrial flue-gas is an important environmental issue these days. Membrane process can be competitive technology for its relatively small footprint and eco-friendly system. Many membrane modules with high selectivity and excellent flux have been developed so far. However, the high purity and recovery for CO2 capture can be achieved by optimization of operating conditions such as membrane area, feed/permeate pressure ratio and humidity of flue gas as well as membrane permeance or selectivity. In this study, we discuss the effect of operating parameters for high CO2 purity and recovery at permeate side. Using polymeric hollow fiber membrane, the single membrane process was tested to figure out the effect of feed flow rate, pressure ratio, membrane area and moisture content.

수처리용 폴리아마이드 나노박막의 계면 제어

이정현 한국막학회 2022 한국막학회 총회 및 학술발표회 Vol.2022 No.04

[아하! 오늘! 1909년 10월 26일] 안중근, 이토 히로부미 저격

이정현 새가정사 2010 새가정 Vol.57 No.626

산업장 남성 근로자들의 비만도에 따른 혈청 지질과 식사 질 평가

이정현,김정은,백윤미,장윤균,성숙희,박일근,박유경,최태인 대한임상건강증진학회 2008 Korean Journal of Health Promotion Vol.8 No.3

Background The prevalence of overweight and obesity in Korea is steeply increasing. Obesity is generally explained by an imbalance between increased energy intake and decreased activity. The purpose of this study was to evaluate and compare the diet quality of normal and overweight/obese male workers. Methods Of 174 workers, total of 123 healthy men participated in the study providing 3-day diet history and their lab data with simple anthropometry. Nutrition analysis was performed with CAN-Pro 3.0. Statistical analysis were performed between normal (BMI 18.5~23.0kg/m2, n=33) and overweight/obese(BMI≧23.0kg/m2, n=90) subjects. Results Their age was 44.39±8.89 (yrs) in the normal group and 48.29±7.90 (yrs) in the overweight/obese group. TG, Total and LDL-cholesterol were significantly higher in the overweight/obese group and HDL-cholesterol was significantly lower. Correlation between BMI and other factors were assessed. As expected, all the lipid profile and other parameters were consistent with previous reports. No significant difference was observed in energy intake. Diet quality assessment also was not able to distinguish the dietary pattern of obese vs. normal subjects. In both groups, Ca, Vit B2 and folate intake was lower in terms of INQ. Conclusions Data on the correlation analyses, most of the results are in agreement with other previously published literature. The role of diet composition or individual nutrient does not seem to contribute to extra weight gain. However, we could suggest from this result that Ca, Vit B2, folate must be included in any form of education or intervention. 연구배경 비만은 만성질환의 위험요인으로 중요한 건강문제일 뿐 아니라 심리적, 사회적으로도 개인을 위축시켜 사회생활에 영향을 미 친다. 본 연구에서는 산업장 남성 근로자들의 비만도에 따른 혈청 지질 및 영양소 섭취 상태를 평가하여 맞춤형 영양관리를 하는데 기초 자료로 활용하고자 한다. 방 법 2006년 3월에 발전 업무에 종사하는 근로자 174명을 대상으로 신체계측(신장, 체중, 체질량지수), 혈액검사(Total cholesterol, HDL-cholesterol, LDL-cholesterol, Triglyceride), 식이섭취조사를 실시하였고 그 중 자료가 불완전한 51명을 제외한 123명을 최종 대상으로 하였다. 식이섭취조사는 3일에 걸쳐 섭취한 모든 음식에 대하여 자가 기록하도록 하였으며 영양소 분석은 한 국영양학회의 Can-pro 3.0을 이용하였다. 결 과 평균 연령과 Total cholesterol, LDL-cholesterol, Triglyceride 농도는 과체중/비만군이 정상군보다 유의하게 높았고(p<0.05), HDL Cholesterol 농도는 과체중/비만군이 유의하게 낮았다(p<0.05). BMI는 혈중 LDL, Triglycerid와는 양(+)의 상관관계를 보였으며(p<0.05), HDL과는 음(-)의 상관관계를 보였다(p<0.01). 식이섭취조사 결과, 정상군과 과체중/비만군 모두 칼슘과 비 타민 B2, 엽산의 섭취량이 부족한 것으로 나타났다. 영양소 적정 섭취비(NAR)는 정상군의 단백질 NAR이 비만군보다 유의하 게 낮았다(p<0.05). 영양밀도지수(INQ)는 정상군, 비만군 모두 대부분 영양소의 INQ가 1.0을 넘어 양호한 수준이었으나 엽산 은 정상군, 비만군 모두 1.0 미만이었다. 칼슘과 비타민 B2, 엽산의 경우 두 그룹 모두 대상자의 과반수이상이 평균 필요량 이하로 섭취하는 것으로 나타났다. 결 론 본 연구 결과 정상군과 비만군의 영양소 섭취량에 유의한 차이는 없었으나 두 그룹 모두 칼슘, 비타민 B2, 엽산 섭취율이 낮 은 것으로 나타났다. 따라서, 만성질환 개선 및 예방을 위해 균형된 영양소를 섭취할 수 있도록 근로자 대상의 영양교육이 필요한 것으로 사료된다.

기하학적 추상문양을 모티브로 한 커튼 직물 디자인 연구 - 2009, 2010년 F/W 인테리어 트렌드를 중심으로 -

이정현,박현숙 사단법인 한국조형디자인협회 2009 조형디자인연구 Vol.12 No.1

Modern people enjoy the life in comfort and live well materially. But the fierce competition for the capital and natural resources makes people unemotionaly and repress self-consciousness. So, people tired of everyday life try to find himself through the medium of the art, and especially this kind of will achieve the eminence in residence space which has a great deal of weight in life environments. The concept of residence space extends personal life space which can express artifical sensitivity and the changeable interior fabric design for the expression is our greatest concern. Therefore, people are looking for originative and sensitive curtain designs containing personality and taste from the abundant designs. Curtain fabric design do an important role to make high- added value, so it is essential to develop and study for high quality fabric design. Therefore, I have studied various fabric expressions using by objective plan based on subjectively creative fabric design. This thesis makes a proposal for curtain fabric designs using the motive of geometric abstract point, line, plane and suggests limitless design's possibility using by various materials and techniques. These contents departmentalize between introduction's theoretical background and main issue's practical design plan. And I presented 6 themes of F/W trends in 2009, 2010. Also, I present various fabric design's application plan to satisfy consumer's needs and seek curtain design's progress through various technique's mix. I expect this thesis could be applicable to fabric design development and promote the importance of design development .

기갑차량 APU용 단기통 디젤엔진 국산화 개발

이정현,황용준,김태원 국방기술품질원 2019 국방품질연구논집 Vol.1 No.1

Single cylinder type diesel engine for Auxiliary Power Unit (APU) has been utilized and operated on numerous armored vehicles, such as K21, K1ARV, K55A1, K2, etc. APU supply electric power, which consists of an electrical generator, a diesel engine and other concerning parts. The diesel engine imported from Farymann Co., in Germany, which originally developed; however, the localization was required due to management and supply difficulty of the corporation. The localization progress based on the approval of Defense Acquisition Program Administration (DAPA) from 2014 to 2017. The requirement was set based on technical material of Farymann Co.. and inverse design of original products. The development progressed based on system engineering (SE); concrete design and test was determined with the negotiation of related organizations. Prior to design modeling and simulation were conducted, the validation was done throughout making prototype, test and evaluation in the development stage.

뷰티포인트 APP 아모레퍼시픽

이정현,강재석 (사)한국인터넷전문가협회 2017 스마트앱 연감 Vol.2017 No.-

체외수정 및 배아이식술에서 레이저를 이용한 보조부화술의 효용성에 대한 연구

이정현,한지은,김유신,원형재,조정현,곽인평,엄진희,박은아,최윤정,이동률,윤태기,Lee, Jung-Hyun,Han, Ji-Eun,Kim, You-Shin,Won, Hyung-Jae,Cho, Chung-Hyun,Kwak, In-Pyung,Eum, Jin-Hee,Park, Eun-A,Choi, Yoon-Jung,Lee, Dong-Ryul,Yoon, Tae-Ki 대한생식의학회 2008 Clinical and Experimental Reproductive Medicine Vol.35 No.3

목 적: 보조부화술이 적용되는 좋지 않은 예후를 보여주는 선별된 환자군을 대상으로 산성 용액을 이용한 AHA 방법과 레이저를 이용한 AHL 방법의 효용성을 비교하여, 보다 효과적으로 임신율과 착상률을 높일 수 있는 보조부화술 방법을 찾고자 하였다. 연구방법: 2006년 2월부터 9월까지 체외수정 시술을 시행한 환자 중 보조부화술이 필요한 328주기를 대상으로 산성용액을 이용한 AHA 방법 (180주기)과 ZILOS-tk 레이저를 이용한 AHL 방법 (148주기)으로 나누어 시행하였다. 보조부화술을 시행한 환자군은 환자의 나이가 38세 이상이거나 투명대의 두께가 $18{\mu}m$ 이상, 기저 FSH 농도가 15 mIU/ml이상, 체외수정 시술을 3번 이상 실패한 환자, 이식하는 배아의 상태가 양호하지 않은 환자들로 이상에 적용요인이 있으면 시행하여 무작위로 보조부화술 방법간에 환자들의 임상적 특징과 임신율과 착상률을 분석하였다. 결 과: 전체 보조부화술을 시행한 환자군에 AHL 방법과 AHA 방법간에 임신율 (42.6%, 63/148 vs. 33.3%, 60/180)과 착상률 (17.4%, 82/470 vs. 16.0%, 89/556)에 유의적 차이는 나타나지 않았다. 그러나 나이가 많은 환자군인 Group 1은 임신율 (37.0%, 20/54 vs. 18.7%, 14/75)과 착상률 (14.4%, 23/160 vs. 7.1%, 15/210)이 AHL 방법이 AHA 방법보다 유의적 (p<0.05)으로 높게 나타났다. 전체 환자군이나 선별된 각 군내에 보조부화술 방법간에 환자의 임상적 특징은 유의적 차이가 나타나지 않았다. 3번 이상 체외시술에 실패한 환자군 [Group 2: 43.8% (21/48)과 31.6% (25/79)], 투명대의 두께가 $18{\mu}m$ 이상인 환자군 [Group 3: 43.8% (32/73)과 34.1% (28/82)], 이식한 배아의 질이 양호하지 않은 환자군[Group 4: 25.0% (7/28)과 14.6% (6/41)]에서는 AHL 방법이 임상결과는 좋았으나 유의적 차이는 없었다. 결 론: 레이저를 이용한 AHL 방법이 나이가 많은 환자군과 3번 이상 체외수정 시술에 실패한 환자군에서 AHA방법에 비해 높은 임신율과 착상률을 나타내었다. 결론적으로, AHL을 이용한 보조부화술이 임상적으로 보다 효과적이고 안전한 방법이라고 사료된다. Objective: To evaluate efficacy of assisted hatching by laser (AHL) and acidified Tyrode solution (AHA) in selected groups of IVF-ET patients who have a poor prognosis. Methods: From February 2006 to September 2006, total of 328 IVF-ET cycles with advanced female age (${\geq}38$ years), recurrent implantation failure (${\geq}3$ cycles), thick zona (${\geq}17{\mu}m$), and/or poor quality of embryo were randomly divided into assisted hatching by acidified Tyrode solution (AHA, n=180) and the assisted hatching using the ZILOS-tk laser (AHL, n=148) groups. Clinical outcomes were analyzed and compared between AHA and AHL group based on the patient characteristics. Results: In all AHL and AHA group, there were no significant differences in pregnancy (42.6%, 63/148 vs. 33.3%, 60/180) and implantation rates (17.4%, 82/470 vs. 16.0%, 89/556) However, in advanced female age group (Group 1), pregnancy (37.0%, 20/54 vs. 18.7%, 14/75) and implantation rates (14.4%, 23/160 vs. 7.1%, 15/210) in AHL group were significantly (p<0.05) higher than those of AHA, although there was no difference in patient parameters of both groups. And, the clinical outcome of groups with recurrent implantation failure (Group 2), thick zona pellucida (Group 3) and poor quality embryo (Group 4) were improved in AHL compared to those of AHA: 43.8% (21/48) and 31.6% (25/79) in Group 2, 43.8% (32/73) and 34.1% (28/82) in Group 3, 25.0% (7/28) and 14.6% (6/41) in Group 4, but no significance. Conclusion: The AHL improved the pregnancy and implantation rates in patients with advanced female age and recurrent implantation failure when compared to outcomes achieved from AHA. Therefore, this AHL technique may be a efficient and safe method for patients with poor prognosis.