교통약자를 위한 공간정보 플랫폼 기술 및 앱 개발

방윤식 과학기술정책연구원 2016 과학기술정책 Vol.- No.213

다발성 경화증 산모에서 제왕절개술을 위한 전신마취 -증례 보고-

방윤식,정금희,최석환,전덕희,김민성,양현정,송지은,이종연 대한마취통증의학회 2012 Anesthesia and pain medicine Vol.7 No.2

A 34-year-old female with multiple sclerosis (MS) was scheduled Cesarean section. She had been suffering from MS for 10 years and the symptoms of MS were paraplegia and urinary incontinence. After informed consent, anesthesia was induced with propofol and maintained with nitrous oxide, sevoflurane and fentanyl. Rocuronium was used for muscle relaxation and tracheal intubation. Train of four (TOF) ratio and bispectral index scale were monitored for adequate muscle relaxation and depth of anesthesia. She gave birth to a baby within 7 minutes after skin incision. When operation was over, TOF ratio was 0.8. She emerged from general anesthesia smoothly and was extubated. There was no febrile event or exacerbation of MS after Cesarean section under general anesthesia. We report a safe anesthetic management of the parturient with MS,using sevoflurane.

전신마취유도 중 발생한 심방세동과 회복중 발생한 발작성 상심실성 빈맥

방윤식,신동욱,이태규,박정현,길현주,이종연 이화여자대학교 의과학연구소 2012 EMJ (Ewha medical journal) Vol.35 No.2

A healthy 35-year-old man who was scheduled for closed reduction of nasal bone fracture developed atrial fibrillation during induction of general anesthesia after intravenous glycopyrrolate injection. During emergence of general anesthesia, atrial fibrillation was suddenly changed to paroxysmal supraventricular tachycardia with 200 beat per minute and lasted for about 10 seconds. Because blood pressure was stable, esmolol was used to reduce ventricular response. At recovery room, ventricular response reduction about 55 beat per minute was observed after intravenous injection of verapamil 5 mg. Thereafter, the rhythm was returned to normal sinus rhythm with bradycardia.

Comparison of clinical effects according to the dosage of sufentanil added to 0.5% hyperbaric bupivacaine for spinal anesthesia in patients undergoing cesarean section

방윤식,정금희,이정향,홍승기,최석환,이종연,이수연,양현정 대한마취통증의학회 2012 Korean Journal of Anesthesiology Vol.63 No.4

Background: Subarachnoid block is a widely used technique for cesarean section. To improve the quality of analgesia and prolong the duration of analgesia, addition of intrathecal opioids to local anesthetics has been encouraged. We compared the effects of sufentanil 2.5 μg and 5 μg, which were added to intrathecal hyperbaric bupivacaine. Methods: We enrolled 105 full term parturients were randomly divided into 3 groups: Group 1 (control), Group 2 (sufentanil 2.5 μg), and Group 3 (sufentanil 5 μg). In every group, 0.5% heavy bupivacaine was added according to the adjusted dose regimen. We determined the maximum level of sensory block and motor block, the quality of intraoperative analgesia, the duration of effective analgesia and side effects. Results: There were no significant differences among the 3 groups in the maximum level of the sensory block and motor block. Recovery rate of the sensory block, however, was significantly slower in Group 3 than Group 1. Quality of intraopertive analgesia, muscle relaxation, and duration of effective analgesia were enhanced by increasing the dosage of intrathecal sufentanil. Frequencies of hypotension, maximum sedation level, and pruritus were directly related to the dosage of intrathecal sufentanil, whereas nausea and vomiting occurred only in the groups using sufentanil. Conclusions: The addition of sufentanil 2.5 μg for spinal anesthesia provides adequate intraoperative analgesia and good postoperative analgesia with minimal adverse effects on the mother. Background: Subarachnoid block is a widely used technique for cesarean section. To improve the quality of analgesia and prolong the duration of analgesia, addition of intrathecal opioids to local anesthetics has been encouraged. We compared the effects of sufentanil 2.5 μg and 5 μg, which were added to intrathecal hyperbaric bupivacaine. Methods: We enrolled 105 full term parturients were randomly divided into 3 groups: Group 1 (control), Group 2 (sufentanil 2.5 μg), and Group 3 (sufentanil 5 μg). In every group, 0.5% heavy bupivacaine was added according to the adjusted dose regimen. We determined the maximum level of sensory block and motor block, the quality of intraoperative analgesia, the duration of effective analgesia and side effects. Results: There were no significant differences among the 3 groups in the maximum level of the sensory block and motor block. Recovery rate of the sensory block, however, was significantly slower in Group 3 than Group 1. Quality of intraopertive analgesia, muscle relaxation, and duration of effective analgesia were enhanced by increasing the dosage of intrathecal sufentanil. Frequencies of hypotension, maximum sedation level, and pruritus were directly related to the dosage of intrathecal sufentanil, whereas nausea and vomiting occurred only in the groups using sufentanil. Conclusions: The addition of sufentanil 2.5 μg for spinal anesthesia provides adequate intraoperative analgesia and good postoperative analgesia with minimal adverse effects on the mother.

Comparison of 0.5% ropivacaine with fentanyl and 0.75% ropivacaine used in extension of a preexisting labor epidural for emergency cesarean section: retrospective study

방윤식,양현정,Su-Jeong Nam,Seomin Park,Kum-Hee Chung,Su-Yeon Lee,Dong Wook Shin,Duk-Hee Chun 대한마취통증의학회 2014 Anesthesia and pain medicine Vol.9 No.1

Background: Various regimens have been studied in extensionof a preexisting labor epidural for emergency cesarean section. Lumbar epidural analgesia for delivery is safe and efficient. Wecompared retrospectively 0.5% ropivacaine with fentanyl and 0.75%ropivacaine in extension of a preexisting labor epidural foremergency cesarean section. Methods: We investigated medical records of 61 parturients inextension of a preexisting labor epidural for emergency cesareansection. There were two regimens which was 0.5% ropivacainewith fentanyl (group 1) and 0.75% ropivacaine (group 2). Werecorded demographic data, local anesthetic dose, surgicalreadiness time, maximum level of sensory block, surgery time,intravenous supplementation, number of hypotension and total doseof ephedrine between two groups. Results: There were no differences between the study groups indemographic data, surgical readiness time, maximum sensory blocklevel, intravenous supplementation, incidence of hypotension andtotal dose of ephedrine. Local anesthetic volume was larger ingroup 1 than group 2, but local anesthetic doses were lower in group1 than group 2. Conclusions: 0.5% Ropivacaine with fentanyl regimen is as fastand efficacious as 0.75% ropivacaine in extension of a preexistinglabor epidural for cesarean section and reduces the requiring totallocal anesthetic dose.

An anesthetic experience of hereditary angioedema type I patient undertook total laparoscopic hysterectomy - A case report -

방윤식,Cho Jaeho,박정현 대한마취통증의학회 2022 Anesthesia and pain medicine Vol.17 No.2

Background: Hereditary angioedema (HAE) is an autosomal dominant disorder. The characteristic of HAE is recurrent angioedema episodes due to low C1 esterase inhibitor (C1-INH) level. HAE symptoms, especially those affecting oropharynx or larynx may develop respiratory distress syndrome due to impaired airway, which can be potentially fatal. Case: We report a clinical case of a 57 year-old woman, with type I HAE, scheduled for total laparoscopic hysterectomy under general endotracheal anesthesia, which was done successfully without inducing airway edema. Danazol, which increases liver synthesis of C1-INH, was administered and fresh frozen plasma (FFP), which contained C1-INH, was transfused after induction.Conclusions: For HAE patients, the greatest concern is that general anesthesia can induces upper airway edema by direct mucosal irritation by the endotracheal tube. The perioperative management should include both prophylactic increase of C1-INH production and on-demand administration of C1-INH or FFP.

길찾기 과정의 도로명주소 체계 연계를 위한 선형 객체 매칭 방법

방윤식(Bang, Yoon Sik),유기윤(Yu, Ki Yun) 대한공간정보학회 2016 대한공간정보학회지 Vol.24 No.4

지난 2012년부터 도로명주소가 본격 시행 및 활용되고 있지만, 아직도 상당 부분에서는 기존의 지번주소가 많이 통용되고 있다. 이는 일반인들의 공간 인식체계와 도로명주소의 공간 구조화 방식의 간극으로 인한 문제이다. 따라서 도로명주소 기반의 공간 인식 체계가 자리잡기 위해서는 생활 속에서 활용되는 각종 공간정보들이 도로명에 의하여 주소정보를 부여받을 수 있어야 한다. 본 연구는 공간 인식 과정이 가장 중요하게 나타나는 길찾기 과정에서의 도로명주소 체계의 연계를 목적으로, 이를 위하여 필요한 공간데이터의 기하학적 매칭 방법론을 설계 및 구현하였다. 도로명주소 기본도의 도로구간 레이어와 보행자용 도로 네트워크에 대하여, 개별 도로 객체를 중심으로 네트워크 이웃을 생성하였다. 그 다음, 생성된 이웃 집합 간의 기하학적 유사도 비교를 통하여, 네트워크 데이터의 각 객체에 매칭되는 도로구간을 탐색하였다. 매칭 성능은 F0.5 값을 기준으로 0.936의 결과를 얻었으며, 유사도 값을 기준으로 10% 수동 검사를 수행한 결과 이 값을 0.978까지 향상시킬 수 있었다. 이렇게 생성된 매칭 대응관계를 이용하여, 보행자용 도로 네트워크 데이터에 도로명 정보를 부여하였다. 이러한 방법론을 통하여, 도로명주소를 기반으로 한 길찾기 서비스 제공 및 공간 인식체계 정착에 도움을 줄 수 있다. The road name address system has been in effect in Korea since 2012. However, the existing address system is still being used in many fields because of the difference between the spatial awareness of people and the road name address system. For the spatial awareness based on the road name address system, various spatial datasets in daily life should be referenced by the road names. The goal of this paper is to link the road name address system with the wayfinding process, which is closely related to the spatial awareness. To achieve our goal, we designed and implemented a geometric matching method for spatial data sets. This method generates network neighborhoods from road objects in the ‘road name address map’ and the ‘pedestrian network data’. Then it computes the geometric similarities between the neighborhoods to identify corresponding road name for each object in the network data. The performance by F0.5 was assessed at 0.936 and it was improved to 0.978 by the manual check for 10% of the test data selected by the similarity. By help of our method, the road name address system can be utilized in the wayfinding services, and further in the spatial awareness of people.

이웃 네트워크 유사도 비교를 통한 네트워크 매칭 기법

방윤식(Bang, Yoonsik),유기윤(Yu, Kiyun) 대한공간정보학회 2011 한국지형공간정보학회 학술대회 Vol.2011 No.5

Kernel Density Estimation을 이용한 도로 네트워크 데이터의 특성 분석

방윤식(Bang Yoonsik),유기윤(Yu Kiyun) 대한공간정보학회 2010 한국공간정보학회 학술대회 Vol.2010 No.3

서로 다른 벡터형 공간정보 데이터를 매칭하는 기술은 다양한 위치 기반 서비스에 활용할 수 있기 때문에 매우 유용하다. 그러나 매칭 대상이 되는 데이터셋들은 그 용도, 제작자, 제작시기 등에 따라 서로 다른 기하학적 특성을 나타내므로 일관적인 매칭 기준을 적용하기 어렵다. 이를 해결하기 위하여 본 논문에서는 공간 데이터의 기하학적 특성치를 추출하고, 그에 맞는 적절한 매칭 기준을 탄력적으로 적용할 수 있는지 여부를 검증하였다.

링크 형상 비교를 이용한 도로 네트워크 데이터의 노드 매칭

방윤식(Bang, Yoonsik),이재빈(Lee, Jaebin),허용(Huh, Yong),유기윤(Yu, Kiyun) 한국측량학회 2009 한국측량학회 학술대회자료집 Vol.2009 No.4