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김송이,최성철,최영철,박재홍 大韓小兒齒科學會 2008 대한소아치과학회지 Vol.35 No.2
상악 영구 견치의 매복에 비해 하악 영구 견치의 매복은 매우 드물게 일어난다. 치아가 매복된 경우 장애물 존재 여부와 매복 위치와 방향,맹출 가능한 공간의 유무,치근의 형성 단계 등의 요소에 따라 매복 치아의 발거 혹은 장애물의 제거 후 주기적 관찰,맹출이 지연된 치아의 외과적 노출,교정적 견인 등의 방법으로 치료하게 된다. 본 증례는 하악골의 골절 부위에 시행된 골간 강선 결찰과 미니 플레이트에 의해 하악 좌측 견치가 매복되어 있었던 경우로 CT 검사 결과 하악 정중부위 플레이트의 스크류가 맹출을 방해하고 있는 것으로 판단되어 전선 마취 하에 플레이트를 제거하였다. 이후 자연적인 맹출을 기대하였으나,맹출력이 부족하여 교정적 견인으로 양호한 결과를 얻었기에 보고하는 바이다. When a delayed eruption of tooth is diagnosed, the causative factor should be detected before an establishment of treatment plan, if possible. Although a panoramic radiograph is enough to evaluate the position of tooth and the stage of tooth development, a 3-D Dental CT would be a powerful tool to reveal a spatial relationships between objects. The reported case showed a delayed eruption of lower left permanent canine and a mini-plate with screws adjacent to the impacted canine. Although the screws adjacent to the root of impacted tooth showed a close proximity, it was not presumed that these screws would interfere the eruption of the tooth. The impacted canine did not show any spontaneous eruption during observation. After the mini-plate and screws were removed, an orthodontic traction using elastic power chain was performed. The position of mini-plates and screws should be carefully designed to avoid damaging the tooth follicles or tooth roots in the jaw. Also the screws should be removed before an orthodontic traction to prevent damaging the root surface of impacted tooth.
SOM기반 특징 신호 추출 기법을 이용한 불균형 주기 신호의 이상 탐지
김송이,강지훈,박종혁,김성식,백준걸,Kim, Song-Ee,Kang, Ji-Hoon,Park, Jong-Hyuck,Kim, Sung-Shick,Baek, Jun-Geol 한국시뮬레이션학회 2012 한국시뮬레이션학회 논문지 Vol.21 No.2
In this paper, a feature signal extraction method is proposed in order to enhance the low performance of fault detection caused by unbalanced data which denotes the situations when severe disparity exists between the numbers of class instances. Most of the cyclic signals gathered during the process are recognized as normal, while only a few signals are regarded as fault; the majorities of cyclic signals data are unbalanced data. SOM(Self-Organizing Map)-based feature signal extraction method is considered to fix the adverse effects caused by unbalanced data. The weight neurons, mapped to the every node of SOM grid, are extracted as the feature signals of both class data which are used as a reference data set for fault detection. kNN(k-Nearest Neighbor) and SVM(Support Vector Machine) are considered to make fault detection models with comparisons to Hotelling's $T^2$ Control Chart, the most widely used method for fault detection. Experiments are conducted by using simulated process signals which resembles the frequent cyclic signals in semiconductor manufacturing.
국내 제조업에서의 Green SCM 도입 절차에 대한 고찰
김송이(Songi Kim),정봉주(Bongju Jeong) 한국SCM학회 2014 한국SCM학회지 Vol.14 No.1
This paper presents adoption process for GSCM (Green Supply Chain Management) in Korean manufacturing companies by analyzing their sustainability reports. At first, we developed GSCM evaluation index from two different frameworks, sustainability evaluation framework focusing on environmental side and strategy and activities in GSCM. Based on this, we analyzed 158 sustainability reports of Korean manufacturing firms published from 2008 to 2012. As a result, we observed that the adoption process for GSCM is implemented in the order of importance of GSCM areas, which are eco design, green manufacturing, environment management system, life cycle analysis, cooperation system, and reverse logistics network. Also, we found that there exist significant procedural and strategic differences not only among companies, but also among industries in adopting GSCM.
김송이,정연경 한국문헌정보학회 2014 한국문헌정보학회지 Vol.48 No.1
저자명 전거 통제는 도서관 목록 전문가뿐만 아니라 이용자에게도 통일된 접근점을 제공한다는 점에서 중요하다. 미국과 일본의 국가도서관은 일찌감치 저자명에 대한 전거레코드를 구축하고 통제해 오고 있으며, 이를 웹으로 제공하고 있다. 본 연구는 일본소설가를 표본으로 해서 양국의 전거레코드 구축 현황과 기술 수준 및 항목을 비교하여 기술 공통항목을 추출하고, 차이점을 찾아내어 국내 전거레코드 기술상 고려사항과 전거레코드 구축의 시사점을 제안하였다. 더 나아가 국립중앙도서관의 전거 파일 공개, 다른 시스템과의 호환을 고려한 전거 파일의 다양한 형식 제공, 전거레코드 기술을 위한 개인명표목의 선택과 형식기준 기술방침 작성, 국립국어원의 외래어 표기법에 따른 외국인 저자명 작성 및 다른 표기들에 대한 이명 전거, 전거레코드와 도서관목록의 링크를 통한 검색 제공의 필요성을 주장하였다.
잠자리 유형 모델의 앞ㆍ뒤 날개 위상차에 대한 공력연구
김송학(Song-Hak Kim),장조원(Jo-Won Chang),송병흠(Byung-Heum Song) 한국항공우주학회 2006 한국항공우주학회지 Vol.34 No.11
비정상 공기력 측정이 두 쌍의 날개를 갖는 잠자리 유형 모델의 위상차에 따른 효과를 조사하기 위하여 수행되었다 잠자리 유형 모델의 플런징 운동에 의하여 발생된 공기역학 적인 힘을 측정하기 위하여 로드셀을 사용하였다. 본 잠자리 유형 모델은 실제 잠자리와 동역학적으로 상사하며,앞ㆍ 뒤날개는 각각 0˚의 10˚의 붙임각(incidence angle)을 가지고 있다. 다른 실험 조건은 다음과 같다. 자유류의 속도는 1.6 m/sec이고, 이와 관련된 시위 레이놀즈수 2.88x10이며, 앞 ㆍ 뒤날개의 위상차는 각각 0˚,90˚,180˚, 그리고 270˚이다. 잠자리 유형 날개의 한 주기 동안 공기역학적 계수의 변화가 제시되었다. 연구 결과는 잠자리 유형 모델의 양력은 앞 ㆍ 뒤날개가 downstroke 운동을 수행할 때 발생되며, 뒷날개가 downstroke 운동과정을 수행하면 양력 발생과 함께 항력도 발생한다는 것을 보여준다. Unsteady aerodynamic force measurements were carried out in order to investigate the effects of phase difference of a dragonfly-type model with two pairs of wing. A load-cell was employed to measure the aerodynamic force generated by a plunging motion of the dragonfly-type model. The dragonfly-type model has a dynamic similarity with real one, and incidence angles of fore- and hind-wing are 0˚ and 10˚, respectively. Other experimental conditions are as follows: The freestream velocity was 1.6 m/sec and corresponding chord Reynolds number was 2.88×10³, and phase differences of fore- and hind-wing were 0˚, 90˚, 180˚ and 270˚. The variation of aerodynamic coefficients during one cycle of the wing motion is presented. Results show that the lift is generated during the downstroke motion and the drag generated during the hind-wing's downstroke motion with the lift generation.
김송이,금보경,이민하,김범성,Kim, Song Yi,Guem, Bo Kyeong,Lee, Min Ha,Kim, Bum Sung 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.1
A bulk metallic glass-forming alloy, $Ni_{59}Zr_{20}Ti_{16}Si_2Sn_3$ metallic glass powders was used for good commercial availability and good formability in supercooled liquid region. In this study, the Ni-based metallic glass was synthesized using by high pressure gas atomized metallic glass powders. In order to create a bulk metallic glass sample, the $Ni_{59}Zr_{20}Ti_{16}Si_2Sn_3$ metallic glass powders with ball-milled Ni-based amorphous powder with 40%vol brass powder and Cu powder for 20 hours. The composite specimens were prepared by Spark Plasma Sintering for the precursor. The SPS was performed at supercooled liquid region of Ni-based metallic glass. The amorphous structure of the final sample was characterized by SEM, X-ray diffraction and DSC analysis.
이벤트성 무료 관광을 악용한 경영활동의 법적 피해사례에 대한 소고
김송병 ( Kim Song-byoung ),류석희 ( Ryu Seok-hee ) 한국관광산업학회 2016 Tourism Research Vol.41 No.3
This study focuses on, and attempts to offer a solution for, recurring problems affecting customers because of managerial abuse of free tourism. One example is a tour company trying to take advantage of the socially disadvantaged people, such as the elderly, by offering discounted or free tour packages but ultimately making customers to buy products. Due to the expansion of tourism businesses, a variety of tourism products have been developed which allow tour companies to take further advantage of customers. A possible solution might be for the corresponding government agency to approve any business transactions conducted by the company owner with the elderly or socially disadvantaged. Also if a tour package plans exceeds a certain price and certain number of people, the company would be required to file a report requesting approval from the Fair Trade Commission based on a pre-qualification system. Such a system would prevent tour companies from preying on customers as well as blocking illegal acts. It will then lead to an increase in customers`` trust, and will ultimately establish a creditable tourism business.