3. 人工姙娠中絶의 合倂症 : 婦人科領域의 急性腹部疾患

鄭鎭旭 최신의학사 1964 最新醫學 Vol.7 No.9

Effect of bounce resonance heating on Electron Energy Distribution Function in a small Inductively Coupled Plasma

정진욱,서상훈,장홍영 한국진공학회 1999 한국진공학회 학술발표회초록집 Vol.- No.-

Heating Mode Transition in the Capacitive Mode of Inductively Coupled Plasma and the Electron Temperature Change During the E-H transition

정진욱,김성식,윤남식,장홍영 한국진공학회 2002 한국진공학회 학술발표회초록집 Vol.- No.-

베이지안 망, 의사결정나무, 신경망의 수단선택모형 적용에 관한 연구

정진욱,정진혁 대한교통학회 2006 대한교통학회 학술대회지 Vol.53 No.-

교통수요분석에 있어 통행수단의 선택행위를 모형화 하는 것은 필수적이다. 통행자의 수단선택모형 중 로짓모형이 주로 활용되고 있다. 이는 로짓모형이 가지는 확률 계산의 용이성과 설명변수의 파라메타 추정의 용이성과 더불어 선택문제 대한 의사결정자 개개인의 성향을 반영한 확률적 모형으로 인과관계를 설명할 수 있기 때문이다. 하지만, 로짓모형에서 사용하는 효용함수는 IIA (Independence from irrelevant alternatives: 비관련대안으로부터 독립성)문제를 가지고 있으며 이것은 로짓모형이 가지는 바람직하지 못한 성질이다. 하나의 대안이 다른 대안에 대한 상대적 선택확률은 선택 가능한 다른 제 3안의 존재여부에 영향을 받지 않는다는 가정이다. 이러한 모형의 문제점은 많은 문헌에서 제기된 바 있으며 현재까지도 이 문제를 해결하려는 관련 연구도 활발히 진행되어 오고 있다. 이에 본 연구에서는 로짓 모형과 같이 개개인 성향을 반영한 수단선택문제를 설명 할 수 있는 베이지안 망(Bayesian Network), 의사결정나무(Decision Trees), 신경망(Neural Network) 모형들과 로짓모형을 비교분석하여 수단선택문제에서 로짓모형 뿐만 아니라 이상 세 가지 모형들의 활용가능성을 제시하는데 연구목적이 있다.

Hydroxypropyl methylcellulose 접착력 증진제 첨가에 따른 은 나노와이어 용액 및 필름의 특성 변화

정진욱,김종복 한국접착및계면학회 2023 접착 및 계면 Vol.24 No.2

Silver nanowire-based transparent electrodes are very attractive as a next-generation flexible and transparent electrode that can replace ITO-based flexible electrodes because they have excellent conductivity, transmittance and mechanical flexibility. However, weak understanding of the silver nanowire solution for the fabrication of silver nanowire-based transparent electrodes often cause abnormal operation of the electrical device or peeling problem of the electrode films when applied to electronic devices. Here, we studied a Hydroxypropyl Methylcellulose (HPMC) adhesion promoter, which is one of the additives for silver nanowire solution, to improve the understanding of silver nanowire solution. In detail, it is characterized how the HPMC changes the properties of silver nanowire solution and silver nanowire film, which is fabricated with silver nanowire solution including the HPMC adhesion promoter. As the characteristics of solution, polar surface tension and dispersive surface tension were measured. As the film characteristics, surface energy, surface morphology, silver nanowire density, and sheet resistance were analyzed.

새로 개발한 CMOS센서와 광원 및 필터를 이용한 증거 이미지의 질적인 향상

정진욱,권준철,박현도 한국과학수사학회 2020 과학수사학회지 Vol.14 No.3

범죄현장에서 증거를 찾는 감식의 가장 중요한 방법 중 하나는 빛의 특정 파장을 이용하여 지문 등잠재증거를 찾는 방법이다. 지금까지는 가시광선을 이용하여 현장에서 증거물을 감식하였으나 여러 종류의증거물과 미세한 증거에 적용하기에는 한계가 있었다. 그래서 다양한 빛의 파장에서도 증거물의 이미지를얻을 수 있는 촬영장비를 개발하였다. 일반적인 카메라의 센서는 가시광선만을 이미지화 하도록 설계되어있지만, 이번에 개발된 장비는 360~1,000 nm의 자외선부터 적외선까지 전체 빛의 파장 영역에서도 이미지를 얻을 수 있는 새로운 CMOS 센서를 탑재하였다. 또한 적외선 영역에서 650~1,000 nm까지는 장비의 내부에 장착한 정밀광학 필터가 광원의 파장 영역에 따라 각각 독립적으로 인식되면서 제어할 수 있기 때문에 이미지는 최대 4 K까지 선명도가 높아졌음을 확인할 수 있었다.

내인성 고인슐린혈증에 의한 저혈당증에서의 포도당 길항호르몬 반응

정진욱,조동혁,정동진,정민영 대한내분비학회 2009 Endocrinology and metabolism Vol.24 No.3

Background: In patients with hypoglycemia due to endogenous hyperinsulinemia such as insulinoma or insulin autoimmune syndrome, little is known about the counterregulatory hormone response to spontaneous hypoglycemia. We therefore compared hormone responses during spontaneous hypoglycemia due to endogenous hyperinsulinemia with those at the end of a 72-hour fast. Methods: We measured glucagon, epinephrine, cortisol, and growth hormone responses during spontaneous hypoglycemia in 8 patients with insulinoma and 18 patients with insulin autoimmune syndrome. We also assessed these responses in 13 normal control subjects who underwent a 72-hour fast. Results: In patients with insulinoma (median serum glucose level, 35.0 mg/dL), plasma glucagon levels (median, 42.9 vs. 76.2 pg/mL, respectively; P < 0.05) were lower than those in control subjects (serum glucose level, 62.5 mg/dL), whereas, there were no statistically significant differences in the other hormone responses between the two groups. In contrast, in the patients with insulin autoimmune syndrome (median serum glucose level, 34.5 mg/dL), plasma glucagon levels (median, 73.7 vs. 76.2 pg/mL, respectively) were lower than those in the control subjects, but there was no statistically significant difference between the two groups. There were no statistically significant differences in counterregulatory hormone responses during spontaneous hypoglycemia between patients with insulinoma and patients with insulin autoimmune syndrome. Conclusion: Our results suggest that defective glucagon secretion in patients with insulinoma rather than insulin autoimmune syndrome may contribute to hypoglycemia in addition to hyperinsulinemia. Background: In patients with hypoglycemia due to endogenous hyperinsulinemia such as insulinoma or insulin autoimmune syndrome, little is known about the counterregulatory hormone response to spontaneous hypoglycemia. We therefore compared hormone responses during spontaneous hypoglycemia due to endogenous hyperinsulinemia with those at the end of a 72-hour fast. Methods: We measured glucagon, epinephrine, cortisol, and growth hormone responses during spontaneous hypoglycemia in 8 patients with insulinoma and 18 patients with insulin autoimmune syndrome. We also assessed these responses in 13 normal control subjects who underwent a 72-hour fast. Results: In patients with insulinoma (median serum glucose level, 35.0 mg/dL), plasma glucagon levels (median, 42.9 vs. 76.2 pg/mL, respectively; P < 0.05) were lower than those in control subjects (serum glucose level, 62.5 mg/dL), whereas, there were no statistically significant differences in the other hormone responses between the two groups. In contrast, in the patients with insulin autoimmune syndrome (median serum glucose level, 34.5 mg/dL), plasma glucagon levels (median, 73.7 vs. 76.2 pg/mL, respectively) were lower than those in the control subjects, but there was no statistically significant difference between the two groups. There were no statistically significant differences in counterregulatory hormone responses during spontaneous hypoglycemia between patients with insulinoma and patients with insulin autoimmune syndrome. Conclusion: Our results suggest that defective glucagon secretion in patients with insulinoma rather than insulin autoimmune syndrome may contribute to hypoglycemia in addition to hyperinsulinemia.

Variation of bacterial community immobilized in polyethylene glycol carrier during mineralization of xenobiotics analyzed by TGGE technique

정진욱,Jong Kwang Lee,Woo Jin Lee,Yong-Ju Cho,박두현,이용우 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.6

Acinetobacter sp. SMIC-1, Cupriavidus sp. SMIC-2, Pseudomonas sp. SMIC-3, Paracoccus sp. SMIC-4,and Pseudomonas sp. SMIC-5 capable of mineralizing xenobiotics (manmade organic compounds) that are diethyleneglycol monomethyleher (DGMME), 1-amino-2-propanol (APOL), 1-methyl-2-pyrrolidinone (NMP), diethyleneglycol monoethylether (DGMEE), tetraethyleneglycol (TEG) and tetrahydrothiophene 1,1-dioxide (Sulfolane) were immobilized mixedly in polyethyleneglycol carrier (SMIC-PEG). TGGE technique was employed to analyze variation of the immobilized bacterial community during xenobiotics being mineralized. The SMIC-PEG mineralized more than 95% of the xenobiotics except sulfolane in 6 days. When activated sludge (AS) was co-immobilized with SMIC community in PEG carrier (AS-SMIC-PEG), degradation efficiency of DGMEE, NPM was a little decreased; however,the degradation of other xenobiotics was neither increased nor decreased significantly. The bacterial community diversity in the SMIC-PEG was gradually decreased in proportion to incubation time in a batch cultivation reactor. SMIC strains in AS-SMIC-PEG were substituted by other bacterial community after 6 days of incubation time in batch cultivation reactor. The SMIC-PEG mineralized around 90% of xenobiotics in a continuous pilot reactor when 100 or 200mg/L of xenobiotics was fed for 8 hr of hydraulic retention time (HRT); however, the mineralization efficiency was decreased significantly to around 75% when 200 mg/L of xenobiotics was fed for 4 hr of HRT. The mineralization effect of AS-SMIC-PEG for xenobiotics was lower than SMIC-PEG. Bacterial community diversity in both SMIC-PEG and AS-SMIC-EG was decreased in proportion to operation time in the continuous pilot reactor; however, some of them were maintained during operation for more than 50 days.

일본의 자살 현황 및 대책

정진욱 한국보건사회연구원 2013 보건·복지 Issue&Focus Vol.207 No.-

Reference Values for the Augmentation Index and Pulse Pressure in Apparently Healthy Korean Subjects

정진욱,이영수,김정현,승명준,김소연,이진배,류재근,최지용,김기식,장성국,이건호,김성희 대한심장학회 2010 Korean Circulation Journal Vol.40 No.4

Background and Objectives: Arterial stiffness is a precursor to premature cardiovascular disease. The augmentation index (AI) and pulse pressure (PP) are cardiovascular risk factors. The aim of this study was to define the diagnostic values of the AI and PP from the peripheral arterial and central aortic waveforms in healthy subjects. Subjects and Methods: We recruited 522 consecutive subjects (mean age 46.3±9.6 years, 290 males) who came to our facility for a comprehensive medical testing. We measured the body mass index (BMI), blood pressure, peripheral and central PP, and a pulse wave analysis that included the central and peripheral AI. Results: The peripheral and central AIs in the female subjects were significantly higher than that in the male subjects (p<0.001). The peripheral and central PPs in the subjects with hyperlipidemia were significantly higher than subjects with normal lipid profiles (p<0.001). The peripheral and central PPs and peripheral and central AIs significantly increased with age. Conclusion: Pending validation in prospective outcome-based studies, a peripheral PP of 70mmHg, central PP of 50 mmHg, peripheral AI of 100%, and central AI of 40% may be preliminary values in adult subjects.