습관적 독서자세에서 측정한 누진대 길이 분석

이정권,문병연,조현국 대한시과학회 2012 대한시과학회지 Vol.14 No.4

Purpose : This study was designed to investigate the distribution for lengths of progressive corridor at habitual reading posture for fitting of progressive addition lenses (PALs). Methods : Measurement was performed to 5,925 subjects between 39 and 83 years of age using EMP from January 2010 to June 2012. The measured values were analyzed the distribution according to age bands. Result : The distribution of measured lengths of progressive corridor (from eyepoint to near reference point) was 34.45% of 10~11 mm, 32.66% of 12~13 mm, 16.96% of 8~9 mm, 10.13% of 14~15 mm,4.30% of 6~7 mm, 1.27% of 16~17 mm, and 0.25% of 18~19 mm. The length of 10~11 mm was accounted for the largest percentage in 39~49 age band (42.05%) and 12~13 mm was accounted for the largest percentage in all of 50~59 age band (31.84%), 60~69 age band (35.48%), and 70~83 age band (46.15%). Conclusion : The practitioners have to invent the advanced methods continuously for accurate measurement of the length of progressive corridor at habitual reading posture. 목 적 : 누진굴절력렌즈의 피팅을 위하여 습관적인 독서자세에서 측정한 누진대 길이의 분포를 알아보았다. 방 법 : 2010년 1월부터 2012년 6월까지 39~83세의 남녀 5,925명을 대상으로 Eye Move Photographing (EMP)을 이용하여 누진대 길이를 측정하였고, 연령대별 분포를 분석하였다. 결 과: 측정된 누진대 길이(아이포인트에서 근용부 측정점까지) 분포는 10~11mm(34.45%), 12~13mm (32.66), 8~9mm(16.96%), 14~15mm(10.13%), 6~7mm(4.30%), 16~17mm(1.27%), 그리고 18~19mm (0.25%)로 나타났다. 39~49세에서는 10~11mm가 42.05%로 가장 많은 비율이었고, 50~59세, 60~69세,그리고 70~83세에서는 12~13mm가 각각 31.84%, 35.48%, 그리고 46.15%로 가장 많은 비율이었다. 결 론 : 안경실무 종사자들은 습관적 독서자세에서 정확한 누진대 길이를 측정할 수 있는 진보적인 방법들을 계속적으로 고안할 필요가 있다.

배기소음기의 음향해석 및 설계 II. 음향성능의 표현법

이정권 한국자동차공학회 1994 오토저널 Vol.16 No.5

The Effect of MAC (Monitored Anesthesia Care) on Perioperative Pain in Endoscopic Sinus Surgery

이정권,최현승,김현직,백승재,김규보,김진영,길혜금 대한비과학회 2003 Journal of rhinology Vol.10 No.1

Background and Objectives:Pain and anxiety control is the most important factor for patients that have undergone endoscopicsinus surgery under local anesthesia. Monitored anesthesia care (MAC) technique has been applied to local anestheticpatients for anxiolysis and analgesia. This technique encompasses the use of sedatives, tranquilizers and analgesics in combinationto local supplements. This study was performed to evaluate the effectiveness of MAC for intraoperative pain control inpatients who have undergone endoscopic sinus surgery. Materials and Methods :We studied 83 patients undergoing ambulatoryendoscopic sinus surgery. Patients were randomly allocated into 2 groups of MAC (n=49) and placebo (n=34). We administratedalfentani1 and propofol intravenously at 2-3 minutes before local anesthesia for endoscopic sinus surgery. We evaluatedthe intraoperative pain with visual analogue pain score (VAS) and satisfactory score to pain control. Results:Overall, MACcases showed statistically significant better VAS than placebo cases. Satisfactory score to pain control was also higher inMAC cases than placebo cases. Conclusion:We conclude that MAC is an effective method using intravenous sedatives andanalgesics for intraoperative sedation and pain control in patients undergoing endoscopic sinus surgery under local anesthesia.

Structural Changes of Inferior Turbinate in Patients with Septal Deviation:Surgical Implication

이정권,강주완,유종범,김창훈 대한비과학회 2004 Journal of rhinology Vol.11 No.1

Septal deviation causes various nasal symptoms and other sinonasal disease. We evaluated the relationship between septaldeviation and morphologic changes of the inferior turbinate. PNS CT of 31 patients (septal deviation group) and 20 normalsubjects (normal control group) were reviewed. We measured the thickness of the inferior turbinate and the angle between thelateral nasal wall and the inferior turbinate in each group. Each measurements were analyzed using t-test and compared. Thethic-kness of the inferior turbinate and the angle between the lateral nasal wall and the inferior turbinate showed no differencebetween the right and left side in the control group. The same measurement of the convex side in the septal deviation group werenot different from those of the control group. However, the thickness of the inferior turbinate and the angle between the lateralnasal wall and the inferior turbinate differed significantly from the control group data. Changes of the inferior turbinate in septaldeviation were caused not only by hypertrophy of the inferior turbinate, but also by the increased angle between the lateral nasalwall and the inferior turbinate.

Effect of Patient-Controlled Analgesia after Tonsillectomy with Laser Resection of Palatopharynx (LRPP)

이정권,김현직,최현승,서용석,신우철,백승재,길혜금 대한비과학회 2003 Journal of rhinology Vol.10 No.1

ackground and Objectives:Pain control is one of the most important factors for the patients that underwent the snoringsurgery. This study was performed to investigate the effectiveness of intravenous patient-controlled analgesia (PCA) forpostoperative pain control after tonsillectomy with laser resection of palatopharynx. Materials and Methods:In thisdouble-blind randomized study, 44 patient were randomly allocated to 2 groups. In the PCA group comprising 32 patients,fentanyl citrate, ketorolac tromethamine and zofran in normal saline solution were administered by PCA equipment. In thecontrol group comprising 12 patients, normal saline solution was given without analgesic drug by PCA equipment. Visualanalogue pain score (VAS) was recorded right after surgery and 2, 4, 6, 12, 18, and 24 hours after surgery and satisfactionscore was recorded just before discharge from the hospital. Results:VAS was significantly higher in the control group of alltime points. Overall satisfaction score was also higher in PCA group than control group. Conclusion:The results of this studysuggest that intravenous PCA is an effective method for postoperative pain control after tonsillectomy with laser resection ofpalatopharynx.

유체기계에 있어서 부의 음원 임피던스의 원인에 관한 고찰

이정권,Keith S. Peat 한국음향학회 2001 韓國音響學會誌 Vol.20 No.3

대부분의 유체기계는 일정 조건하에서는 주기적인 소음 원들로 간주될 수 있으며, 소음원 및 관련 덕트의 음향계를 주파수영역으로 표현이 가능하게 되는데, 음원은 주파수의 함수인 음원강도와 음원 임피던스로 표현된다. 이들 변수를 알아내기 위하여는 다양한 이론적, 실험적 방법이 있으나, 고속, 고온, 고강도의 유체 기계와 같은 단일 연결구를 갖는 음원에 대하여는 다양한 길이의 많은 관들을 부하로 사용하는 다부하법만이 적용 가능하다. 문제는 이 다부하법을 적용했을 때, 음원 임피던스의 실수부가 부의 값을 갖는 경우가 많다는 점이다. 본 논문에서는 이 문제의 명확한 원인분석을 위한 일환으로서, 다양한 이론적 실험적 결과에 대한 분석을 바탕으로 하여 가능한 여러 가지 원인에 대한 물리적 조사 결과를 보이고, 분석 결과에 대한 새로운 해석을 통해 기본 가정의 위배와 함께 다부하법 자체의 문제점을 제시한다 유체 기계 덕트에서는 다른 무엇보다도 음원의 시변성이 부의 음원저항을 낳는데 가장 큰 영향을 미치게 되며, 부하 임피던스가 최종 결과에 지대한 영향을 미치게 된다. Most fluid machines can be considered as periodic noise sources when operated under constant conditions, which allows for a frequency domain representation of the source and the associated acoustic field In the duct. In such a representation, the source is characterized by frequency-dependent values of both strength and impedance. Although knowledge of these values can be gained by either experimentation or by modeling, one-port acoustic characteristics of an in-duct source with high flow velocity, high temperature, and high sound level can be measured only by the multiload method using an overdetermined set of open pipes with different lengths as applied loads. However, the problem is that negative source resistances have been often measured. This paper reviews the possible causes of the problem, with reference to experimental and theoretical results, in an attempt to clarify the issue. A new interpretation is given for the violation of basic assumptions and the defect in the algorithm of multiload method. The major cause and mechanism of the problem is due to the violation of time invariance assumption of the source and the load impedance can seriously affect the final measured result of source impedance.

이차원 메소해석에 의한 손상재료의 유효강성평가

이정권 대한기계학회 2004 大韓機械學會論文集A Vol.28 No.5

Two-dimensional mesoscopic analysis (meso-analysis) is applied to solids including microdefects such as microcracks or holes. For the problem of effective moduli of microdefected solids, various approximate schemes are introduced by using microcrack density and hole density for macro level parameter. Also, microcracks distributed in the parallel direction and random direction are considered. Several numerical studies using meso-analysis are carried out and the results are compared with several approximate schemes in order to show the validity of proposed meso-analysis.

차량 및 중장비 방사 소음 규제 및 측정 : 개요

이정권 한국소음진동공학회 2002 한국소음진동공학회 세미나 Vol.2002 No.5

슬관절통 환자에서 초저온 냉기를 이용한 한냉치료후시각적상사척도값의 변화

이정권,김미정,박시복,김영호 大韓再活醫學會 1999 Annals of Rehabilitation Medicine Vol.23 No.1

Determination of Referral Criteria of Polysomnography by Clinical Symptoms of Snorers

이정권,김경수,윤주헌,박인용,이성훈 대한비과학회 1995 Journal of rhinology Vol.2 No.2

Most of patients with snoring have underlying obstructive sleep apnea. Operations for snoring through uvulopalatopharyngoplasty (UPPP) or laser resection of palatopharynx (LRPP) are known to be effective in treatment of snoring but less in obstructive sleep apnea. Therefore polysomnography (PSG) should be recommended in order to evaluate sleep apnea in patient with snoring. However, it is not easy to recommend PSG to all patients with snoring in practice. We performed this study to find the criteria of referral for polysomnography before operation of snoring. 140patients with snoring and sleep apnea syndrome were studied by the PSG. Sleep apnea questionnaire, Zung’s scale for depression, Stanford Sleepiness Scale (SSS), insomnia scale and neuropsychological test were administered. And also, blood pressure, height, weight and neck circumference were measured and some history was taken. Correlations between respiratory disturbance index (RDI) were computed. Using six parameters (i.e neck circumference, systolic blood pressure before sleep, degree of alcohol drinking, frequency of breath-holding during sleep, degree of dry mouth during sleep, sleep apnea score), the patients with RDI above 20 could be discriminated in 92.8% sensitivity. In case of more than two among six parameters (neck circumference of above 40cm, systolic blood pressure of above 125mmHg, frequent alcohol drinking, frequent breath-holding during sleep, frequent dry mouth during sleep, sleep apnea score of above 35), same patients could be discriminated in 87.6% sensitivity. In case of more than one among four parameters (neck circumference of above 40cm, systolic blood pressure of above 125mmHg, frequent alcohol drinking, body weight of above 80kg), discrimination sensitivity was 83.5%. In conclusion, the patients suspicious of RDI above 20 using above parameters should be refered for PSG, because whose sleep apnea is not easy to be cured only by snoring operation.