머신러닝 기반 시각화 추천을 위한 메타특징 공학

최희원,김한준 한국정보과학회 2020 데이타베이스 연구 Vol.36 No.2

This paper shows the feasibility of an automated data visualization system using feature engineering and describes a meta-feature design process that is the basis of a visualization recommendation system. Before building the automated visualization system, the meta-features are extracted so that the visualization results from given input data can be reasonable. In this paper, we propose a set of meta-features that contribute to learn the ambiguous patterns of bar plots and pie plots. Also, we propose a way of using mean-shift clustering so that numerical features can be expressed as summary data for more reasonable visualization. The proposed meta-features was evaluated through SHAP (SHapley Additive exPlanation) in terms of feature importance of learned model, and significant top-5 features were identified among 48 meta-features. In addition, we showed that numeric feature values are converted into summary data by applying mean-shift clustering, and they are expressed into meaningful visualization results. Through experiments using various types of data, a visualization recommendation model generated through the decision tree and random forest algorithms generated the most meaningful visualization results. 본 논문은 특징공학을 이용한 자동 데이터 시각화 시스템의 실현 가능성을 확인하고, 시각화 추천 시스템의 기반이 되는 메타데이터(Metadata) 설계 과정을 소개한다. 자동 시각화 시스템을 구축하기에 앞서 주어진 입력데이터로부터 표현된 시각화 결과의 유의미성을 결정하는 메타성 특징 변수를 추출한다. 이 과정에서 판단이 애매모호한 막대그래프와 원그래프의 패턴을 학습하기 위한 메타특징을 제안한다. 또한, 자동 이산화 기법인 평균이동 군집화(Mean-shift clustering)를 제안함으로써 수치형 속성을 요약정보 시각화로 표현 가능하게 한다. 생성한 메타특징들의 중요도가 SHAP(SHapley Additive exPlanation)을 통해 평가되었으며, 48개의 메타특징 중에서 상위 5개의 중요 특징이 도출되었다. 또한, 우리는 평균이동 군집화를 적용하여 요약 데이터로 변환된 수치형 특징값들이 유의미한 시각화 결과로 생성됨을 보였다. 다양한 종류의 데이터를 활용한 실험을 통하여, 제안된 메타특징들을 가지고 의사결정나무와 랜덤포레스트 알고리즘을 통해 생성된 추천 모델이 가장 유의미한 시각화 결과를 생성하였다.

하악전돌증 환자의 하악지시상분할골절단술 후 고정방법에 따른 안정성과 회귀율에 대한 분석

최희원,김경원,이은영,Choi, Hee-Won,Kim, Kyoung-Won,Lee, Eun-Young 대한악안면성형재건외과학회 2005 Maxillofacial Plastic Reconstructive Surgery Vol.27 No.4

The purpose of this study was to compare the postoperative stability and relapse according to 2 different fixation methods after bilateral sagittal split ramus osteotomies in mandibular prognathic patients. Tweenty one patients with Class III dental and skeletal malocclusion who were treated with bilateral sagittal split ramus osteotomy were selected for this retrospective study. We classfied the patients into two groups according to the fixation methods of bony segments after osteotomies. Group W (n = 10) had the bone segments fixed with nonrigid wire and Group S (n = 11) had bicortical screws inserted in the gonial area through a transcutaneous approach. Cephalometric radiographs were taken preoperatively, immediate postoperatively and more than six months postoperatively in each patient. After tracing the cephalometric radiographs, various parameters were measured. Before surgery, both groups were balanced with respect to linear and angular measurements of craniofacial morphology. Mean posterior sagittal setback amounts of the mandibular symphysis was 8.6 mm in the wire group and 6.79 mm in the rigid group, Six months postoperatively, the wire group had 33.1% relapse of the mandibular symphysis and 22.8% in the rigid group relapse. Both groups experienced changes in the orientation and configuration of the mandible. It is thought that Rigid screw fixation is a more stable method than nonrigid wire fixation for maintaining mandibular setback after sagittal split ramus osteotomy.

일본 육아지원 공동주택 인증사례의 계획요소 특성에 관한 연구 - 일본 요코하마(橫浜)시의 사례를 중심으로 -

최희원,Choi, Hee-Won 한국주거학회 2014 한국주거학회 논문집 Vol.25 No.4

The purpose of this study is to analyze the contents and assessment items in the certification criteria for Child Care Support Apartment program in Japan that is implemented mainly by local authorities with a view to provide information that could be used as reference in enhancement of the residential environment. For this purpose, the architectural planning elements for individual residence units and the public spaces of the Child Care Support Apartment Certification programs in effect in Yokohama city were identified and analyzed. In spite of the recent trends in Korea, in which the residential services are more diversified and segmented in consideration of the needs of the residents and the increased interest in child care in general, the literatures that addressed the direct relationship between childbirth and residences are scarce, and it is anticipated that the result of this study would be of contribution to provide a hint in direction for improvement of residential environment with child support programs.

13.56 MHz RF 플라즈마 임피던스 정합기용 전자식 가변 커패시터의 가변 속도 최적화를 위한 인덕터 설계 방법

최희원,서용석,민주화 전력전자학회 2023 전력전자학회 논문지 Vol.28 No.2

This study introduces a method for designing an inductor for an electrical variable capacitor for an RF plasma impedance matcher of 13.56 MHz. In the RF impedance matcher, variable capacitors are essentially used for maximum power transfer of loads and sources. Electrical variable capacitors are next-generation variable capacitors. They can shorten the matching time compared with conventional mechanical variable capacitors. The proposed design method determines the inductor value with an optimized variable speed through the inductor design of the diode series-type electrical variable capacitor circuit. This method provides a faster variable speed to the electrical variable capacitor circuit to further shorten the matching time. The proposed design method is validated through simulations and experiments.

서울시 소재 노인요양시설의 요양실 설치현황 및 특성 분석

최희원 사단법인 인문사회과학기술융합학회 2017 예술인문사회융합멀티미디어논문지 Vol.7 No.8

본 연구는 ‘노인장기요양기관 평가결과’라는 공공데이터를 활용하여 시설 규모별로 요양실의 설치현황과 특성을 분석하는 것을 목적으로 한다. 국민건강보험공단에서 2년 주기로 실시하는 ‘노인장기요양기관 평가결과’를 활용하여 분석하는 방법으로 진행하였다. 공간적 범위는 서울시로 한정하였고, 평가등급과 시설 규모를 고려하여 선정한 36시설의 개요를 조사하고, 1인실・2인실・3인실・특별침실의 빈도수와 비율 등의 분석을 통하여 설치현황 및 특성을 고찰하였다. 그 결과, 30인 이상의 대규모 시설은 평균 88.6%가 4인실을 설치하고 있었고, 10~30인 미만의 중규모 시설의 경우 대규모 시설에 비해 2・3인실 설치의 비율이 높았다. 10인 미만의 소규모 시설의 경우에도 1인실 설치 비율은 매우 낮았고, 3인실 설치 시설의 빈도가 높게 나타났다. 이는 시설 설치 주체의 경제적 효율성에 기인한 결과로 여겨지며, 향후 사용자가 요양실 선택의 폭을 넓힐 수 있도록 시설 설치 시 지원책과 기준의 마련, 사용자를 중심에 둔 요양시설환경 조성을 위한 다양한 연구가 이루어져야 할 것이다. This study is aimed at analyzing the installation status and characteristics of a patient's room by facility size using public data of 'Evaluation Results of Long-term Nursing Home for the Elderly.' This study utilized 'Evaluation Results of a Long-term Nursing Home for the Elderly' by the National Health Insurance Corporation. In addition, this study surveyed the outline of the 36 facilities selected in the light of the evaluation grade and facility size, and considered the installation status and characteristics of a nursing home for the elderly through the analysis of the frequency and ratio of the type of patient’s rooms. The analysis result showed that 88.6% on an average of the large-scaled facilities of more than 30-patients have installed a 4-patient sickroom, and in case of an intermediate-scaled facility of less than 10~30 patients, its ratio of installation of 3-patients sickroom was high. Even in case of a small-scaled facility of less than 10 patients, the ratio of 1-patient sickroom installation was found to be very low while the frequency of 3-patient sickroom installation was high. Through this research, this study could confirm that the installation ratio of multi-patients sickroom in Korea was high. This is regarded as the result attributable to economic efficiency of the main entity of facility installation; however, it's required that there should be arrangement of support policies and standards in time of facility installation so that a user can have a wider range of choices of a patient's room, and various research works for environmental development of user-centered nursing facilities.

커뮤니티케어 활성화 방안에 관한 다학제적 연구 -일본 지역포괄케어시스템 사례를 중심으로-

최희원 한국전시산업융합연구원 2022 한국과학예술융합학회 Vol.40 No.4

Nowadays, aging is progressing rapidly in Korea. Also, in the midst of nuclear families and low birth rate, it is no longer a matter of families but a social issue to take care of the elderly. To cope with this, the government induced ‘community care’ and has been trying to reorganize the laws and systems and promote a variety of projects. Now is the time that we need a lot of references dealing with community care. Therefore, this study is aimed to understand the characteristics of space use and operation found in the cases of ‘Community-based Integrated Care Facilities’ in Japan. The purpose of this study is to allow the findings to be utilized as references to plan community care facilities afterwards. The research method and results are as follows: First of all, literatures were reviewed to arrange the concepts of community care and Community-based Integrated Care Facilities. This researcher also selected three facilities as the cases to be investigated here as Community-based Integrated Care Facilities. Next, this study organized and analyzed the outline of each facility’s operation and the characteristics of the buildings and space use in them. This study arranged each case’s overall outline, the building’s outline, and the house-related characteristics. They differ in terms of the business entity, type of public space, and type of the house, but all three cases have public space on the first floor and houses on the second or higher floors. In Case A and Case C, general rental houses are installed, and in Case B, service-providing houses are installed for the elderly. In the public space, day services for the elderly, visiting nursing homes, clinics, day services for children, welfare services for the disabled, cafés, and stores are installed. Therefore, not only the residents corresponding to the cases but the locals can also use them. The public space is properly arranged that the locals can have easy access to it. We can also see that medical services and nursing care services corresponding to the cases investigated here are being used as public goods in the region. In addition, various sizes of external and intermediate spaces are planned to induce connection between the residents corresponding to the cases and local residents. Through research on the cases of Community-based Integrated Care Facilities in Japan, this study has attempted to derive the factors applicable when we plan or design community care-related facilities in Korea afterwards. Ultimately, this author expects that this will contribute to the activation of ‘Aging in Community’. 최근 우리나라는 고령화가 빠른 속도로 진행되고있고, 핵가족화, 저출산의 현상 속에서 노인 돌봄은더 이상 가족만의 문제가 아니라 사회문제가 되고 있다. 이에 대처하기 위해 정부에서는 ‘커뮤니티케어’를도입하여 법, 제도를 정비하고 다양한 사업을 추진하고자 노력하고 있으며, 커뮤니티케어에 관한 다양한참고자료가 필요한 시점이다. 이에 본 연구에서는 일본의 ‘지역포괄케어시설’사례에서 나타나는 공간이용 및 운영의 특성을 파악하는 것을 목적으로 진행하였다. 연구결과를 통해 향후 커뮤니티케어 시설 계획 시참고자료로 활용되는 것이 궁극적인 목적이다. 우선 문헌고찰을 통해 커뮤니티케어와 지역포괄케어시설의 개념을 정리하였고, 지역포괄케어시설 사례조사 대상 시설 3곳을 선정하여 각 시설의 운영개요, 건물 및 공간이용의 특성을 정리하고 지역포괄케어시스템의 5가지 구성요소로 제시한 ‘주거․의료․개호․ 예방․생활지원’을 분석의 틀로 삼아 분석하였다. 사례별로 전체개요(건물외관, 소재지, 개설시기, 사업주체, 운영개요), 건물개요(층수, 대지면적, 연면적, 총 건축비, 공용공간 종류), 주택 관련 특성(주호종별, 주호수, 특징)을 정리하였다. 운영주체, 공용공간의 종류, 주택 종류에는 차이가 있으나 세 사례 모두 1층에공용공간, 2층 이상에 주택을 배치하고 있다. 사례 A 와 사례 C에는 일반임대주택, 사례 B에는 서비스지원형 고령자주택이 설치되어 있다. 공용공간으로는 고령자 데이서비스, 방문개호 사업소, 진료소, 아동 데이서비스, 장애자 복지서비스, 카페, 점포 등이 설치되어있어 해당 사례의 거주자뿐 아니라 지역의 주민들도이용하고 있고, 지역주민이 접근하기 쉽도록 공용공간이 배치되어 있다. 조사대상 사례의 의료서비스 및 개호서비스를 지역의 공공재로 사용하고 있음을 알 수있다. 또한 다양한 규모의 외부공간과 매개공간을 계획하여 해당 사례 거주자들과 지역주민, 해당 사례 거주자 간의 연결을 유도하고 있다. 본 연구에서는 일본의 지역포괄케어시설 사례조사를 통해 향후 국내 커뮤니티케어 관련 시설 계획 및디자인 시 적용할 수 있는 요소를 도출하고자 하였다. 궁극적으로는 지역사회 내 계속거주(Aging in Community)의 활성화에 기여할 수 있기를 기대한다.

제 IV 형 근관에서 System B Plugger tip의 깊이에 따른 근관 충전 효과

최희원,김수미,황호길,Choi, Hee-Won,Kim, Soo-Mee,Hwang, Ho-Keel 대한치과보존학회 2008 Restorative Dentistry & Endodontics Vol.33 No.6

본 연구의 목적은 제 IV형 근관에서 Continuous Wave 가압법을 이용하여 충전할 때 System B Plugger tip의 깊이에 따른 근단부 밀폐효과를 평가하기 위함이다. 50개의 J형 만곡을 갖는 레진 블록에 부러진 F3 ProTaper 파일을 이용해 근관장에서 3mm 지점에 ledge를 형성한 후, F1 ProTaper Ni-Ti file을 이용해 레진 블록을 천공시켜 제 IV형 근관을 형성하고 System B Plugger tip의 깊이에 따라 3개의 실험군과 1개의 대조군으로 분류하였다. 제 IV형 근관의 거터퍼쳐와 실러의 길이는 확대경하에서 캘리퍼를 이용해 측정하였고 다음과 같은 결과를 얻었다. 1. 대조군의 설측 근관에서 거터퍼쳐와 실러 모두 관찰되지 않았다. 2. 3 mm군에서는 5 mm 또는 7 mm군에 비해 유의하게 많은 거터퍼쳐의 충전이 관찰되었다 (p<0.05). 3. 7 mm군에서는 유의하게 많은 빈 공간이 관찰되었다 (p<0.05). The purpose of this study was to evaluate the effect of the apical sealing according to the depth of the System B Plugger tip when root canal was filled with gutta-percha and sealer by Continuous Wave of Condensation technique in the Type IV canal. 50 simulated resin blocks with J-shaped curvature canals were instrumented by ProTaper (Dentsply Maillefer, Ballagiues, Switzerland) Ni-Ti files using the crown-down technique. Type IV canals were made using a broken ProTaper F3 Ni-Ti file for making a ledge at 3mm short from the working length. And ProTaper F1 Ni-Ti file was used for perforating resin block. The prepared Type IV canals were randomly divided into three experimental groups of 15 each according to the depth of System B Plugger tip. All of experimental groups were obturated with Continuous Wave of Condensation technique. The length of gutta-percha and sealer in lingual of the Type IV canals was measured with a measuring digital calliper under magnifying glass (${\times}2.3$). The results are as follows : 1. In control group, there was no gutta-percha and sealer in lingual canal. 2. 3 mm group showed relatively more gutta-percha than 5mm or 7 mm group (p<0.05). 3. 7 mm group did not showed gutta-percha and relatively more void were observed than 3mm or 5 mm group. (p<0.05) In conclusion, within the limits of the results of this experiment, the 3 mm depth of System B Plugger tip was acceptable for obturating the Type IV canal.

종합병원의 간호정보화 수준별 간호정보시스템 요구도 분석

최희원,박현애 대한의료정보학회 2008 Healthcare Informatics Research Vol.14 No.4

Objective: The purpose of this study was to investigate the needs for the Nursing Information System(NIS) according to the level of nursing informatization in general hospitals and to provide effective NIS development strategies reflecting nurses' needs. Methods: Informatics nurses or nurses in charge of Nursing Information Systems in 41 general hospitals in Seoul and Kyeonggi province were surveyed using a questionnaire developed by the researchers based on literature reviews and a pilot study conducted in four teaching hospitals. Data were analyzed using the ANOVA and Scheffe tests. Results: It was found that the higher level of informatization, the higher user satisfaction level. There were significant differences in demands for vital sign records and the nursing manpower management programs according to nursing informatization level. The higher level of informatization is, the more needs for computerization are. There were significant differences in need for 'Support from director' for system development and need for 'Office Automation(OA) application' for education by nursing informatization level. The higher level of informatizaion is, the less needs for OA application education are. Conclusion: We found that the needs for the NIS were varied according to the level of nursing informatization. This study asserts that when developing nursing information system, differences in system demand by nurses according to the level of informatization should be taken into consideration.

양악 수술 중 발생한 폐부종의 치험례

최희원,김경원,이은영,강지연,Choi, Hee-Won,Kim, Kyoung-Won,Lee, Eun-Young,Kang, Ji-Yeon 대한악안면성형재건외과학회 2006 Maxillofacial Plastic Reconstructive Surgery Vol.28 No.2

Pulmonary edema is a well known phenomenon in medicine, physical findings indicative of this condition include frothy pink sputum, dispnea, and chest X-ray may present cephalization of vessels, perihilar edema, or diffused increase of density. It is one of the most serious, life threatening situation and should be diagnosed and managed instantly. Early diagnosis and intensive treatment are mandatory in order to effectively resolve the situation. The most common etiology for this pathology is cardiogenic, such as left ventricular failure and valvular disease. The one following is noncardiogenic, such as transfusion, infectious pneumonia, inhaled toxins, shock lung in association with trauma. Other forms of pulmonary edema which have not been clearly explained result from pulmonary embolism, drug overdose, after anesthesia, epinephrine overdose, exposure to high altitude, neurogenic, etc. We experienced two cases of pulmonary edema during two jaw surgeries(Le Fort I Osteotomy & BSSRO). These patients were young and physically healthy individuals on preoperative evaluation. Thus we report and discuss the etiology, diagnosis, prognosis, and treatment with journals review. 폐부종은 구강악안면외과 영역의 수술 도중에 발생할 가능성이 있다. 따라서 전신마취하에 수술중인 외과의와 마취의는 환자의 상태를 주의깊게 관찰하여야 하며 수술 중 폐부종이 발생할 가능성에 항상 대비하여야 한다. 폐부종 증세가 발견되는 즉시, 즉각적이고도 적절한 처치를 시행한 경우 예후가 좋으며, 근본적인 원인치료 및 타장기의 합병증 및 후유증에 대하여 검사가 필요하다.

그랜빌 오랄 로버츠(Granville Oral Roberts)의 전인치유선교 연구

최희원 한국선교신학회 2021 선교신학 Vol.62 No.-

현재 코로나19(COVID-19) 바이러스는 전 세계인의 전인건강을 위협하고 있다. 이러한 상황은 성령의 역사 가운데, 전인을 치유, 회복한 예수 그리스도의 사역이 행해져야 한다. 더불어 하나님 나라를 향해 예수 그리스도의 복음 수용성을 높이는 전인치유선교의 핵심적 대안이 요구된다. 이는 곧 그랜빌 오랄 로버츠(Granville Oral Roberts)의 전인치유선교에 대한 심도 깊은 연구에 주력해야 함을 방증한다. 그랜빌 오랄 로버츠는 오순절/은사주의 중심에서 개신교의 거대한 성장을 이룬 인물이자, 20세기 복음치유사역의 권위자이다. 그는 대형천막집회와 각종 문헌 발생 및 방송사역을 시행하고, 병원, 학교를 설립하여 하나님의 능력을 전한 복음전도자이다. 그랜빌 오랄 로버츠는 통전적 선교사상, 믿음선교사상, 종족화합을 위한 협력선교 사상을 바탕으로 일평생을 하나님의 치유회복의 능력을 전하는 전인치 유선교를 하였다. 그의 전인치유선교 연구는 복음전도를 위한 목회와 선교현장에 실천적 대안을 제공할 수 있고, 선교사상 정립에 바탕이 될 수 있다. Presently, the COVID-19 threatens the holistic health of all people in the world. Amidst such circumstances, the ministry of Jesus Christ, which restores and heals the entire man, must be carried out in the power of the Holy Spirit. Additionally, a critical solution is demanded in such a whole-person healing mission which raises the receptivity of the Gospel of Jesus Christ, leading an individual soul towards the Kingdom of God. Granville Oral Roberts was a charismatic Pentecostal who greatly influenced the growth of Protestantism and an authority figure who, served in healing ministries during the 20th century. He led great tent cathedral, broadcasting ministry, authored a variety of different books, and founded schools and hospitals. Through a background of cooperative missionary work consisting of holistic mission and faith missions pursuing ethnic harmony, Granville Oral Roberts ministered in Whole-Person healing missions. Research into his Whole-Person healing mission study can provide practical solutions in the ministry/mission field while also establishing a new background in missional philosophy.