• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• 제46권6호
• /
• pp.373-378
• /
• 2020

The purpose of this review is to assess the surgical outcomes of two different treatment modalities, endoscopic and open resection, for the management of sinonasal malignancies by comparing the effectiveness of these two methods. A wide search was carried out considering various electronic databases for English language articles from 2013 to 2018 using keywords such as sinonasal malignancies, endoscopic surgery, open resection for sinonasal malignancies, and endoscopic versus open surgery. One thousand articles were identified from the literature for screening. After a thorough systematic assessment and based on the selection criteria, 10 articles with 4,642 patients were included in this quantitative analysis. With a total of 4,642 patients, 1,730 patients were operated on using endoscopic resection and 2,912 patients were operated on using open resection. The endoscopic approach was found to have a shorter hospital stay compared to open surgical resection (P<0.05). The rate of positive margins and the recurrence rate for open surgical resection were both smaller compared to those for endoscopic resection (P>0.05), and the endoscopic approach had smaller complication rates and a higher survival rate compared to open resection (P>0.05). Though endoscopic resection and open surgical resection have comparable postoperative benefits, preoperative evaluation of cases presenting with sinonasal malignancies is necessary for determining the right treatment method to obtain the best possible results postoperatively.

• 대한수학교육학회지:수학교육학연구
• /
• 제8권1호
• /
• pp.125-135
• /
• 1998

This study is to identify and analyze the realities and the problems of the open education in mathematics, and suggest the directions of the open education in mathematics. I have examined 104 primary school teachers using the questionnaire, observed and analyzed two open instructions. The advocates for open education should try to establish its identities. I claim that the open education in mathematics should be opening children's thinking. And I propose some suggestions for such instruction.

• Kyungpook Mathematical Journal
• /
• 제56권4호
• /
• pp.1259-1265
• /
• 2016

In this paper, we introduce the notions of mean open and closed sets in topological spaces, and obtain some properties of such sets. We observe that proper paraopen and paraclosed sets are identical to mean open and closed sets respectively.

• Korean Journal of Mathematics
• /
• 제7권1호
• /
• pp.117-121
• /
• 1999

In this paper, we introduce $m$-open(closed) mappings by $m$-sets, and obtain a number of their properties. In particular, $m$-open(closed) mappings are used to extend known results for ${\alpha}$-open mapping, semi-open mappings and preopen mappings.

• 대한수학회보
• /
• 제45권4호
• /
• pp.749-755
• /
• 2008

In this paper, we introduce the relatively new notion of fuzzy ${\omega}^O$-open set. We prove that the collection of all fuzzy ${\omega}^O$-open subsets of a fuzzy topological space forms a fuzzy topology that is finer than the original one. Several characterizations and properties of this class are also given as well as connections to other well-known "fuzzy generalized open" subsets.

• International Journal of Fuzzy Logic and Intelligent Systems
• /
• 제10권3호
• /
• pp.200-202
• /
• 2010

In this paper, we introduce the concept of fuzzy ${\gamma}$-quasi open sets which are generalizations of fuzzy ${\gamma}$-open sets, and obtain some basic properties of such fuzzy sets. Also we introduce and study the concepts of fuzzy ${\gamma}$-quasi continuous mapping and fuzzy ${\gamma}$-quasi open(closed) mapping.

• Journal of applied mathematics & informatics
• /
• 제39권5_6호
• /
• pp.743-749
• /
• 2021

The purpose of this article is to study few properties of fuzzy mean open and fuzzy mean closed sets in fuzzy topological spaces. Further, the idea of fuzzy mean clopen set is introduced. It is observed that a fuzzy mean clopen set is both fuzzy mean open and fuzzy mean closed but the converse is not true.

• Journal of Applied and Pure Mathematics
• /
• 제4권3_4호
• /
• pp.141-150
• /
• 2022

The aim of this article is to introduce hesitant fuzzy paraopen and hesitant fuzzy mean open sets in hesitant fuzzy topological spaces. Moreover we investigate and extend some properties of hesitant fuzzy mean open with hesitant fuzzy paraopen, hesitant fuzzy minmimal open and maximal open sets in hesitant fuzzy topological spaces.

• 한국생산제조학회지
• /
• 제8권5호
• /
• pp.54-62
• /
• 1999

This paper describes the design and implementation of a PC(personal computer) based open architecture machine tool controller. The hardware of open architecture CNC has generally a motion control board on a PC for controlling a servo motor. But this paper describes open architecture hardware that consists of a PC, a counter board a DAC board and a DIO board only. This makes it easy to generate CNC software module in a hardware-independent way. The proposed open architecture CNC software runs on the MS-Windows NT. The paper describes a method of con-trolling servo motors using a real-time timer of MS-Windows NT and a commercial real-time operating system on the MS-Windows. NT. An open and reconfigurable software module is made up of an object and an API(application programming interface). Using the object and the API a new CNC system can be quickly configured to control dif-ferent machine tools. The proposed open architecture CNC system is applied to 4-axis lettering center.

• 정보관리학회지
• /
• 제22권2호
• /
• pp.253-273
• /
• 2005

기존의 저널 출판 기반 학술 커뮤니케이션과 관련하여 7가지 문제점을 제시하였고 새로운 학술 커뮤니케이션 동향으로 등장한 자유이용(open access) 학술 커뮤니케이션이 이에 대한 해결책이 될 수 있음을 제시하였다. 국내에서의 자유이용 현황 파악을 위해 자유이용 관련 저널과 아카이브를 조사하였고 자유이용을 위한 라이선스와 소프트웨어 개발 현황을 조사하였다. 그리고 국내에서의 자유이용 활성화를 위한 도서관의 기대 역할을 제안하였다.