지향성 에너지를 이용한 고고도 장기체공 태양광 무인항공기 운용 개념 연구

안효정(Ahn, Hyo-Jung) 한국신재생에너지학회 2011 신재생에너지 Vol.7 No.3

Recently, an UAV using green energy for propulsion has been developed due to exhaustion of fossil fuel. This aircraft runs on electric motors rather than internal combustion engines, with electricity coming from fuel cells, solar cells, ultracapacitors, and/or batteries. Especially solar cells are installed in HALE UAV and flight tests are performed in the stratosphere. Although the solar powered UAV has the advantage of zero emission, its energy conversion efficiency is low and operation time is limited. Therefore, the solar powered UAV has been designed to operate with the secondary battery obtaining flexibility of energy management. In this study, we suggest the new operational concept of the solar powered UAV using directed-energy rayed from the surface of earth to UAV. An UAV is able to secure additional power through attaching solar cell to the lower surface of elevator. As a result, the additional energy supplied by directed-energy can improve the energy management and operational flexibility of the solar powered UAV.

국회 상임위원회의 대정부질의 전략이 교육정책에 미치는 영향에 관한 연구

안효정(Ahn Hyo Jung) 한국교육행정학회 2009 敎育行政學硏究 Vol.27 No.4

단일채널 및 다채널을 포함한 평판형 고체산화물연료전지의 열유동 해석 및 성능평가

안효정(Hyo-Jung Ahn),차석원(Suk-Won Cha) 대한기계학회 2007 大韓機械學會論文集B Vol.31 No.12

This paper studied the characteristics of performance and temperature in a unit cell of a planar type SOFC under various conditions by employing computational fluid dynamics (CFD). In order to derive thermal stress distribution and performance characteristics, the 3-D model simulation for a single channel was performed in various conditions which include interconnect materials (LaCrO₃/AISI430), gas flow direction (co-flow/counter-flow) and inlet temperature (923 K/1173 K). From these results of a single channel, the most effective conditions were applied to the unit stack with multi-channel and the temperature distribution is displayed. Considering both thermal stress and performance, the best combination is 923 K inlet temperature, counter-flow and interconnector of stainless steel. As the end results, flow, thermal and current density distributions were found in the model with multi-channel applied to the best combination and were concentrated in the middle of channels than in the edge.

입법 과정에서 국회와 정부의 상호작용 행태 분석 연구 -「교육관련기관의 정보공개에 관한 특례법」개정 과정을 중심으로-

안효정(Ahn Hyo-Jung),신철균(Shin Chol-Kyun) 한국교육행정학회 2012 敎育行政學硏究 Vol.30 No.2

모유수유 교육이 초산모의 모유수유 방법, 태도 및 지속정도에 미치는 효과

안신영,고효정,Ahn, Sin-Young,Koh, Hyo-Jung 한국여성건강간호학회 1999 여성건강간호학회지 Vol.5 No.1

The purpose of this study is to investigate the effect of breast-feeding education on skills, attitude, and duration of breast-feeding among primipara mothers. The educational session was offered during the period of June through September at the T medical center in T city. One hundred thirteen primiparas were selected for this study, 61 who received breast-feeding education(lecture, demonstration, and additional telephone counselling) served as the experimental group and 52 who did not as the control. Data collection was done by self-reporting method. the reliability of the instrument was from .77 to .87. Duration of breast-feeding was classified into I through V according to the WHO classification at the time point of 4 weeks of postpartum. The results were as follows : 1. The score for the experimental group on the skills of breast-feeding techniques was significantly higher than those of the control(t=9.12, p=.000). 2. The score for the experimental group in the attitude toward breast-feeding was significantly higher than those of the control(t=6.12, p=.000). 3. Duration of breast-feeding for the experimental group was significantly longer than that of the control at the time of 4 weeks of postpartum($x^2$=20.79, p=.001). In conclusion, the breast-feeding practice can be promoted effectively through the breast-feeding education.

미국상업우주운송법 분석을 통한 국내상업우주운송법 제안

안효정,박종혁,Ahn, Hyo-Jung,Park, Jong-Hyuk 항공우주시스템공학회 2011 항공우주시스템공학회지 Vol.5 No.1

The industry related to commercial space transport is growing rapidly as a futurity industry all over the world and America is leading them. If this trend continues, domestic individuals or private enterprises may plan for the commercial space transport business by adopting the advanced technology. Therefore it is necessary to make a law to control the business in our country for the industrial development and the growth related to commercial space transport. This paper provides outline for domestic commercial space transport law by the study and analysis of U.S. commercial space transport laws.

장애 환자의 Midazolam 근육주사와 $N_2O-O_2$ 흡입진정을 통한 전신마취 수술 전 치과치료

정용석,안효정,이수언,최성철,Jung, Yong-Seok,Ahn, Hyo Jung,Lee, Soo Eon,Choi, Sung Chul 대한치과마취과학회 2013 Journal of Dental Anesthesia and Pain Medicine Vol.13 No.1

General anesthesia has been developed in dentistry as a type of management technique to sedate patients who may be uncontrollable or require medical consideration. However, emergency treatment for controlling pain before general anesthesia could be required due to the time for medical evaluation for general anesthesia. There is a greater possibility of developing complications under extended waiting period. A disabled patient who needs dental treatment under general anesthesia underwent pretreatment with intramuscular injection of midazolam and $N_2O-O_2$ inhalation sedation in these cases report.

CATCH 22 증후군을 가진 어린이의 치과치료

김미선,이수언,안효정,박재홍,최성철,Kim, Mi Sun,Lee, Soo Eon,Ahn, Hyo Jung,Park, Jae-Hong,Choi, Sung Chul 대한치과마취과학회 2013 Journal of Dental Anesthesia and Pain Medicine Vol.13 No.1

CATCH 22 syndrome is a one of the most common chromosome microdeletion syndrome with multiple organ anomalies in humans, with an incidence of approximately 1:4,000 to 1:5,000 live births. It is caused by a microdeletion of 1.5 to 3.0 megabases on the long arm of chromosome 22. The phenotypic spectrum of this disorder is wide and various. A 19-year-old patient who showed delayed growth and development (Height; 110 cm, Weight; 18 kg) was referred to our department for the treatment of dental cavities. She was diagnosed as CATCH 22 syndrome in 2004. Physical examination revealed hypertelorism, a short philtrum, thick reflected lips and a small mouth. She underwent cleft palate surgery at 1 year of age and heart valve surgery due to the cardiovascular abnormality at 13 years of age. Convulsive seizures had persisted until 5 years ago but are well controlled at present. Oral examination showed poor oral hygiene, crowding, prolonged retention on #65, 75 and dental cavities on #16, 21, 65, 26, 36, and 46. Cavity treatment and prophylaxis were performed under general anesthesia. Also continuous follow-up checks have been carrying out with the periodic prophylaxis and dental home education. Problems with numerous cavities and gingivitis which can lead to specific risks are common for CATCH 22 syndrome patients. It is therefore of great importance that these patients are referred to foremost physician and dental specialist for the oral care. In addition, preventive treatment targeting the risk of dental cavities and gingivitis is especially important and, as the syndrome involves many different medical problems, the dental treatment should be carried out in collaboration with the patient's physician.

혈우병을 가진 어린이의 치과치료

임지은,이수언,안효정,박재홍,최성철,Lim, Ji Eun,Lee, Soo Eon,Ahn, Hyo Jung,Park, Jae-Hong,Choi, Sung Chul 대한치과마취과학회 2012 Journal of Dental Anesthesia and Pain Medicine Vol.12 No.4

Severe한 혈우병 B 환아가 소아과에 입원하여 세계혈우병연맹(World Federation of Hemophilia, WFH) 지침서에 따라서 응고인자 수준을 유지하면서 다수의 발치를 포함한 관혈적 치과 치료를 받았다. 이와 같이 혈우병 환자에서 다수의 발치를 시행할 때 주기적인 혈액검사를 통한 응고인자 수준의 관리와 복잡한 의과적 처치가 요구된다. 따라서 다수의 발치가 요구되는 경우 전신마취 하에 가능한 모든 치과치료를 시행하는 것이 효과적이고 효율적인 방법이 될 수 있다. Hemophilia, the most common of the inherited bleeding disorder, is the result of a deficiency of clotting factor. Since bleeding after dental treatment may cause severe or even fatal complications, people with hemophilia must be given special dental care. We report on the diagnosis and treatment of a 9-year-old boy having severe hemophilia visited our department with the chief complaints of pus discharge on the left lower molar region. In the clinical and radiographic examination, periapical abscess and dental caries were diagnosed. Considering complexity of the treatment and complication in the coagulation, it was decided to carry on the treatment under general anesthesia. Clotting factor IX concentrates were intended to provide 50-70% plasma level. Pulpectomy, resin restoration and Stainless steel crown were given under general anesthesia. Several teeth were extracted and the sockets were packed with Surgicel$^{(R)}$ (Oxidized Regenerated Cellulose, Johnson and Johnson Co. Neuchatel, Switzerland) under general anesthesia. Transpalatal arch and lingual arch were given for maintaining the extracted space before discharged. For people with severe hemophilia, factor replacement is necessary before scaling, surgery or regional block injections. Therefore, if several extractions are needed, dental care under general anesthesia would be effective and efficient management.

모체태아의학

( Se Jeong Kim ),안효정 ( Hyo Jeong Ahn ),( Jung Yeon Park ),( Byoung Jae Kim ),( Kyu Ri Hwang ),( Taek Sang Lee ),( Hye Won Jeon ),( Sun Min Kim ) 대한산부인과학회 2018 대한산부인과학회 학술대회 Vol.104 No.-

Objective Pregnancy is a major risk factor of thromboembolism, and the patients with preeclampsia (PE) are known to have higher risk of thromboembolic complications than normal pregnant women. D-dimer is a well-established laboratory marker for the screening of venous thromboembolism (VTE), but the concentrations of d-dimer tend to increase physiologically in pregnant women throughout the gestational age. We performed this study to evaluate the clinical significance of d-dimer concentrations in patients with gestational hypertensive disorders (GHD) according to the severity. Methods Retrospective cohort study was performed in one institution. Singleton pregnant women with GHD were enrolled, and their antepartum concentrations of d-dimer were measured as a part of routine evaluation for patients suspected with PE. Patients with multiple gestations, rheumatic diseases, autoimmune diseases, or suspected VTE were excluded. A categorization of severity about PE was based on the general criteria. Results In 73.3% of study population, their d-dimer concentrations exceeded the normal range (>0.55 mg/L). A significantly greater proportion of pregnant women had excessive concentrations of d-dimer in the severe GHD than in the non-severe GHD (89.8% vs. 53.7%; P<0.01). Patients with severe GHD had significantly higher median concentrations of d-dimer than those with non-severe GHD (median [range], 2.00 mg/L [0.11 to 7.49] vs. 0.71 mg/L [0.09 to 5.39]; P<0.01) although their earlier gestational ages of sampling. Conclusion Maternal concentrations of d-dimer were significantly elevated in patients with severe features than those without severe features among those with GHD. Some pregnant women with GHD can have markedly elevated concentrations of d-dimer without any evidence of current VTE.