소음 측정을 통한 에어컨 실내기 자기음 검출 및 진단

지효근,정호제,김정현 경성대학교 공학기술연구소 2012 공학기술연구지 Vol.18 No.-

This paper presents the detection and diagnosis of air-conditioner electromagnetic sound through noise measurements. Electromagnetic sound originating from the motor is an unpleasant source of unwanted noise that should be detected at the manufacturing stage. A detection system using sound measurements was built and a detection algorithm based on FFT analysis is presented. Soun measurements are preferable over direct vibration measurement because it is non-contact and low cost. Experimental results show that our sound measurement system can detect electromagnetic sound effectively compared to using vibration measurements.

하악골에 발생한 다발성 중심성 골종 : 증례보고 REPORT OF A CASE

전효상,이문희,정해송,이동근,김성곤,조병욱 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.4

Osteomas are benign tumor composed of mature compact or cancellous bone. Generally, they are classified as peripheral(periosteal) osteoma and central(endosteal) osteoma by origin. Osteomas are essentially restricted to the craniofacial skeleton and are rarely diagnosed in other bones. Most jaw osteomas are detected in young adults and are generally asymptomatic, solitary lesion. The authors present a case of a endosteal osteoma of the mandible. The lesion was located beneath both the mandibular first premolars, about 2.5㎝×1.5㎝ size. Surgical excision of the lesion was performed and we obtained good result after operation.

1990년대 남성복 소재에 나타난 조형성에 관한 연구

이효진,류근영 복식문화학회 2000 服飾文化硏究 Vol.8 No.6

Each and everything named fashion together with clothes were limited in the boundary of women and men's wear has been slow and narrow in changing speed compared to women's, even there are some differences in accordance time. But maintaining the basic features, men's wear in the latter 20th century has undergone diverse change in the part of materials such as various synthetic fiber, glass, metal, artificial leather and the see-through fabric able to seeing the body wearing the clothes. Therefore, the aim and definition of this study is to present the systematic framework giving help to develop men's wear design newer and more various by considering moulding of materials which existing men's wear could not show up and by grasping material trend of men's clothes in 1990s. The results of the study were summarized as follows : (1) Material containing lustering is categorized as Velvet, Silk, Lustering materials by synthetic fiber and Lustering materials by additional substance. The Velvet generally acknowledged having something to feel womanly image shows the bisexual character coexisting feature of men and women after grafting with men's fashion. The Silk was endowed the role as means of pleasure to express beyond boundary of sex breaking the existing consciousness which men should wear male clothes, not considering differences between men and women. The lustering made by synthetic fiber expressed modern sensitivity aesthetically to the suit. The lustering materials made by additional substance is seen mixed masculine character with womanly character. (2) See-through materials are acknowledged as decadence beauty caused by expanding subjective awareness in beauty. (3) Materials by the sorts of Net is categorized as Lace, Knit The Lace expression seemed to emphases the human liberation of men and women and the humanity from liberation of subjecthood. The Knit can be felt both woman's image and man's image as bisexual image, not raising only one side sex. (4) Elastic materials offered the opportunity to approve exposure in a time when exposure of men's body was not granted ethically. (5) Leather was shown as indication of social status and inferiority and expression of collective resistance against sexual stagnation of men and women.

MWPECVD法에 의한 H₂-CH₄-O₂계로 부터의 Diamond合成

구효근,이임숙,박상현 경남대학교 신소재연구소 1995 論文集 Vol.5 No.-

마이크로파 플라즈마 기상합성법으로 CH₄-H₂-O₂의 혼합가스로부터 실리콘 기판 위에 다이아몬드 박막을 성장시켰다. 가스 조성비에 따른 박막과 입자의 표면형태, 성정율 및 막의 질을 SEM, XRD 및 Raman 분광기로 조사하였다. 그 결과 CH₄-H₂화합가스에 산소를 첨가함에 따라 어떤 조건하에서는 막의 질과 성장률이 증가하였다. Diamond thin films deposited on Si substrate from CH₄-H₂-O₂gas mixtures were investigated by microwave plasma chemical vapour deposition. The surface morphology of films and particles, the deposition rate and the films quality(SEM. XRD and Raman spectroscopy) were measured as function of gas composition. The results demonstrate that the addition of oxygen to CH₄-H₂gas mixtures can under certain conditions improve the film quality and increase the deposition rate.

기혼 여성의 부부 적응도와 성격 차워난의 연관성

이효근,조숙행,김정웅 한국정신신체의학회 2003 정신신체의학 Vol.11 No.2

Chitosanase의 연구현황 및 전망

이효구,윤호근 공주대학교 자원과학연구소 2000 資源科學硏究論文集 Vol.8 No.-

Chitin and its deacetylated form, chitosan, have attracted significant interest in view of varied proposed novel application. Uses of these two functional polymers, especially chitosan, are readily seen over a broad range of scientific areas, including applications in biomedical, food, and various chemical industries. However, chitosan has potential bioactivities such as anti-microbial, anti-cholesterol synthesis, anti-tumor by immunostimulating and elicitor activity, its effects on in vivo was still ambiguous due to a low uptake rate into the interior of the body. Therefore, converting chitosan to its oligosaccharides is necessary for more effect in vivo. On the on hand, because the purification procedure of chitosan oligosaccharides was not simple, its application was limited to pharmaceutics and high value-added industry by the high unit cost of production. For extensive application of chitosan oligosaccharides, enzymatic hydrolysate is actually more efficient than purified oligomer. The present paper will review various chitosanase for preparation of chitosan oligosaccharides, especially focucing enzymatic hydrolysis and properties of reaction pattern, and valuable systems for the hydrolytic reaction.

유한 요소법의 자동요소생성 프로그램에 관한 연구

박효근,김형석 순천향대학교 부설 산업기술연구소 2001 순천향 산업기술연구소논문집 Vol.7 No.1

If the geometry of the problem is not one of the simplest, it is very difficult and time comsuming to subdivide the domain into a huge number of triangles by hand-made in order to apply Finite Element Method to analysis model. This paper presents a two dimensional automatic mesh generation which can be easily applicable to electromagnetic problem of complex shape for the finite element method. We implemented an automatic mesh generator using Delaunay triangulation in the windows environments.

개선된 다출력 동적 CMOS 설계 방식을 이용한 고성능 32 비트 CLA가산기 설계 및 구현

송근호,방만식,서정훈,한석붕,이효상,김강철 慶尙大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.13 No.-

In this paper, we designed, implemented and evaluated 32-bit CLA adder with the ENMODL(enhanced NORA Multiple Output Domino Logic) logic style which is new dynamic CMOS logic. The circuit is implemented using 0.8㎛ CMOS double-metal process technology. It operates stably and the addition time is less 3.9 ns. The ENMODL logic style can improve the performance in the high-speed computing circuits depending on the degree of recurrence.

컴퓨터 언어가 국어생활에 미치는 역기능 연구

도효근 全州敎育大學校 初等敎育硏究所 2001 初等敎育硏究 Vol.12 No.-

The purpose of this study is twofold: (ⅰ) to analyze the computer language from the Korean linguistic perspective and (ⅱ) to suggest we should use Korean properly. The term 'computer language ' in this study is referred to as 'the written, not spoken, language used in the computer-assisted telecommunications such as Internet and cell phone messages.' The computer language data randomly collected from October, 1999 to March. 2001 was analyzed and arranged under the headings of Phonemes & Orthography, Jargons & Variants, and Well- & Ⅲ-formed Sentences. Various negative effects of the computer language upon Korean were identified. It can be expected of that this study will help the Korean people not only recognize the negative effects of the computer language upon Korean, but also cooperate to use the computer language properly. Many scholars and educators will express a lot of concerns about the contamination of the Korean language caused by the Internet. It is also expected that they will mark every effort to forestall the anomaly of their mother tongue in advance. This study, as the threshold of language purification, will help the Korean youth use their native langrage efficiently and decently when they are involved in computer-assisted telecommunications such as internet chatting, e-mailing, and message-sending. Consequently, it was proposed that the misuse of the computer language be corrected from the Korean linguistic perspective. However, further study is still needed because the computer language changes so rapidly. We should remember that the purication of the computer language is part of the "Beatification of the Korean language" Movement. The negative effects of the computer language will be diminished if we do our best to use Korean properly at home, at school, and in the society.

노후된 잔교식의 항만구조물의 신뢰성에 기초한 안전성 및 내하력평가

조효남,김성훈,노홍식,임종권,이우근 한양대학교 공학기술연구소 1995 공학기술논문집 Vol.4 No.1

This study is intended to propose a reliability based approach to safety assessment and berth-capacity rating of aged wharf structures based on measured data acquired from an extensive dynamic field load testing against berth impact of real ships. The study comprises the essential part of a project for assessing actual berth-capacity of deteriorated and damaged dolphin structures at the Onsan oil refinery wharf currently operated for the berth of oil refinery ships of 20,000 DWT.