이산 웨이블릿변환 기반 온라인 2차 결로 모델링을 이용한 자동차 실내 능동소음제어 기법

남구형(Koo-Hyeong Nam),신희정(Hui-Joung Shin),남상원(Sang-Won Nam) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

The conventional filtered-X LMS (FXLMS) has been applied as an adaptive algorithm for active noise control (ANC) for car-room noise cancellation, but, it sometimes yields some convergence problems, since its convergence performance can be affected by the filtered signal and the corresponding ANC system can be time-varying in nature. To solve such problems, several on-line secondary path modeling approaches using auxiliary noise have been reported. However, those approaches using auxiliary noise may result in generating additional residual noise, and thus denoising control rate of ANC systems can be decelerated. In this paper, an efficient discrete wavelet transform based on-line secondary-path modeling for ANC is proposed, which offers fast convergence during the ANC system operation.

콘크리트 바닥판 연속타설에 따른 강상자형교의 거동

구현서,정경섭,정해근,김경남 충북대학교 건설기술연구소 2002 建設技術論文集 Vol.21 No.1

The superstructures of the steel box bridge, which support the vehicle load directly, are composed of two main components; the steel box and the concrete slab, which are designed as a compositely behaving structure. In the composite girder bridges, the concrete pouring procedures cause different bending moments at each location of a girder. The difference in bending moment is also caused by the varied stiffness of the girders. For the open section type of steel girders which is used in many countries, the sequential concrete pouring method is suggested on the basis of the influential lines concept in order to minimize the effect of such moments. However, the effect is insignificant for the closed section steel box girders which are mostly used in Korea. This paper deals with the behavior of closed section steel girder box bridge according to the continuous pouring concrete slab. Both experimental and structural analysis were performed to assess the behavior of the composite steel box girder bridge under construction.

AHP를 활용한 민간 및 공공분야 관광실무자들이 요구하는 관광인적자원 핵심역량 분석: 경주 사례연구

김남현 ( Nam Hyun Kim ),박종구 ( Joung Koo Park ),심재명 ( Jae Myung Shim ),최정자 ( Jeong Ja Choi ) 관광경영학회 2014 관광경영연구 Vol.62 No.-

Competency is an emerging research subject in both industry and academia. This study examines core competencies required in the field of tourism and compares competency expectations between private and public sectors. The competency model adopted here is from the model previously developed at a university, comprising five categories with three items in each category. The data were collected from tourism practitioners and analyzed using AHP which revealed the relative importance of competencies. The difference of importance in core competencies between private and public sectors was tested through Spearman test. The result shows that collaboration and communication was the most important competency. The two groups of respondents perceived core competencies required for the tourism graduates differently: for instance, social service factor was ranked top in the private sector, whereas it was ranked last in the public sector. Implications of the findings and future research are discussed.

호텔관광학 전공학생들의 현장실습 선호도와 유형별 특성에 관한 연구

박종구 ( Joung Koo Park ),심재명 ( Jae Myung Shim ),주재훈 ( Jae Hun Joo ),최정자 ( Jeong Ja Choi ),김남현 ( Nam Hyun Kim ) 대한관광경영학회 2015 觀光硏究 Vol.30 No.3

본 연구는 호텔관광학을 전공하는 학생들을 대상으로 현장실습의 각 유형별 시나리오에 대하여 선호도를 조사하였다· 선행연구를 토대로 총 5개의 현장실습의 속성변인(현장실습의 시기, 교육주체로서 멘토, 현장실습의 시간, 인정학점, 실습장소 등)들이 주효과만 나타날 수있도록 직교배열을 통해 8개의 현장실습 유형을 도출하였다· 자료수집은 경북지역에 소재한 D 대학에서 호텔관광학을 전공하는 재학생들을 대상으로 이루어졌으며, 최종 유효표본으로 120부를 통계분석에 활용하였다· 주된 연구결과에 따르면 현장실습과 관련된 속성들의 상대적 중요도는 실습장소(24·1%), 현장실습의 시간(20·2%), 교육주체로서 멘토(20·0%), 인정학점(17·9%), 현장실습의 시기(17·8%)순으로 나타났다· 또한 현장실습의 선호도에 있어서 조사응답자들은 ‘기업체 on-site(멘토링포함)지향 주말실습의 선호집단’, ‘campus의 학기 중 교육중점형’, ‘학점취득 지향의 정규 교육실습형 그룹’ 등으로 구분되었다· 그러나 이들 그룹간 성별, 학년, 아르바이트의 경험유무, 현장실습의 이유, 호텔관광분야의 적성파악의 인식정도, 이론과 현장의 차이 인식 등에서 그룹간 차이는 없었다· 이러한 결과는 학생들이 현장실습의 필요성에 대해 낮은 수준의 인식을 지니고 있는 것을 반영한다· 그럼에도 불구하고 호텔관광학 전공분야의 대학은 학생들이 지닌 직무능력의 자가진단 도구를 통해 이들의 요구와 역량 등을 파악해 각자 요구에 맞는 현장실습의 유형을 매뉴얼로 세분화 하여 제공할 필요성이 있을 것이다· The purpose of the study is to examine the students`` preference over the types of field study class and to cluster students based on their preference outcomes. Types of field study formats were generated using five operational features including time of class (weekend vs weekdays), time of offering(semester vs vacation), location of the class (on-campus vs industry site), person-in-change(faculty vs personnel) and number of credits (2 credits vs 3 credits). Eight different formats combining those features were created using orthogonal array method so as to test the main effect of the features. 126 students majoring in tourism participated in the study. The results revealed that location(24.1%) was the most important attribute in preference determination followed by time of class(20.2%), person-in-charge(20.0%), number of credits(17.9%) and time of offering(17.8%). Also students were clustered into three groups based on their preference patterns, which were named ``on-site personnel-led weekend class favored``, ``on-campus weekday class favored`` and, ``in-semester faculty-taught class favored`` respectively. No significant correlation was found, however, between the clusters and other personal characteristics such as sex, school year, working experience, reason for taking field study class, perceived aptitude in the tourism field, perceived gap between theory and practice, and so on. The implication was discussed.

A study on how to install the underwater transmitters and electronic fishing net buoys for automatic identification device for yellow croaker drifty gill net

Keun-Hyoung Kim,Nam-Hee Heo,Myung-Sung Koo,Byuong-Yeob Kim,Hye-jung Park,Joo-myeong Joung,Suk-Jong Kim 한국수산해양기술학회(구 한국어업기술학회) 2019 한국수산해양기술학회 학술발표대회 Vol.2019 No.11

여러가지 조리방법으로 조리된 조기와 돼지고기의 돌연변이원성의 검색

이은경,이임선,신남희,정승희,구성자 한국조리과학회 1995 한국식품조리과학회지 Vol.11 No.1

Boiled, broiled, deep fried, pan fried 등의 방법으로 조리된 조기와 돼지고기의 50% methanol 추출물에 S9mix를 첨가한 군, S9 mix를 첨가하지 않은 군, 그리고 nitrite를 처리한 군을 Salmonella typhimurium TA98과 TA100으로 Ames test를 실시하여 돌연변이원 형성을 검토한 결과는 다음과 같다. 1. S9 mix를 첨가하지 않은 조기와 돼지고기는 original weight 0.0125g과 0.1g사이의 농도 구간에서 돌연변이 원성을 보였다. 2. S9 mix 첨가시 조기와 돼지고기의 돌연변이원성은 모든 농도 구간에서 S9 mix를 첨가하지 않은 경우보다 2∼5배 정도 증가하여 간접 돌연변이원이 존재함을 확인하였다. 3. TA98과 TA100에 대한 돌연변이원성은 모든 조리법에서 조기보다 돼지고기가 더 높았고, 특히 pan fried법의 경우 S9 mix의 첨가시 돌연변이원성이 매우 높게 나타났다. 4. 조기와 돼지고기의 모든 조리 법에서 nitrite 처리시 TA98과 TA100 모두 돌연변이원성이 증가하여 직접돌연변이원임을 나타냈고, 특히 TA100보다 TA98에서 돌연변이원성이 더 높은 것으로 나타났다. Croaker and pork were cooked by four kinds of methods(boiled, broiled, deep fried, pan fried) and their extracts were extracted with 50% methanol. The Ames test were performed on these methanol extracts, employing Salmonella typhimurium tester strain TA98 and TA100, with and without S9 mix, and after nitrite treatment. The methanol extracts of cooked croaker and pork showed mutagenicity between original weight 0.0125 g/plate and 0.1 g/plate in all strains and induced a higher mutagenicity in all strains with S9 mix than without S9 mix. In all kinds of cooking methods, pork extracts showed higher mutagenicities than croaker extracts and especially the extract of pan fried croaker and pork showed high mutagenicities with S9 mix. The extract after nitrite treatment showed higher mutagenicities than that after non treatment and after treatment with nitrite, the mutagenicities of extracts were higher on TA98 than TA100.

배양포유동물세포에서 환경돌연변이원에 의해 유발된 자매염색분체교환의 분석에 관한 연구

이석우,남정구,남재환,이병광,김은영,이승길 ( Sok Woo Lee,Joung Koo Nam,Jae Hwan Nam,Byoung Kwang Lee,Eun Young Kim,Seung Gil Lee ) 한국환경생물학회 1991 환경생물 : 환경생물학회지 Vol.9 No.2

The assay of SCEs has been used to measure mutagenicity induced several mutagens to high vertebrates. In this study, we used BHK-21, CHO-K1 and human peripheral lymphocyte as culture cell, and calcium chloride dihydrate(CaCl_2·2H_2O), sodium hypochloride(NaOCl), phenol(C_6H_5OH), benzo(a)pyrene(C_20H_12), carbon tetrachloride(CCl_4) and chloroform(CHCl_3) as mutagens. We examined and compared frequency between spontaneous and induced SCEs by mutagens. The mean spontaneous SCEs of human lymphocyte from 4 donors is scored 6.92±1.54(SCEs/cell) and BHK-21 is scored 0.18±0.03(SCEs/chromosome) and CHO-K1 is scored 0.61±0.08(SCEs/chromosome). In order to decided concentration of mutagens which is enough to induce SCEs and to effect SCEs score, we observed cell cytotoxicity and cell metaphase dependent on several concentration of mutagens. And then, using that concentration as control, we examined SCEs frequency induced three different concentration of mutagen. The increase of SCEs frequency induced by calcium chloride dihydrate is very little, but benzo(a)pyrene and phenol are great increase. Especially, we cannot find metaphase over 0.006mM benzo(a)pyrene and 1mM phenol. Although the increase of SCEs frequency induced by CHCl_3 is little, we observed many acentromeric chromosome in cell culture over 25mM CHCl_3. And we detected that SCEs frequency related with chromosome length of test cell.

연구논문 : 관광학 전공 학생들의 실습가치 인식과 실습유형 선호도

심재명 ( Jae Myung Shim ),주재훈 ( Jae Hun Joo ),최정자 ( Jeong Ja Choi ),김남현 ( Nam Hyun Kim ),박종구 ( Joung Koo Park ) 대한관광경영학회 2015 觀光硏究 Vol.30 No.2

대학교육에서 현장실습이 점점 강조되고 있는 현실에서 본 연구는 관광을 전공하는 학생들이 인식하고 있는 실습에 대한 가치와 이들이 선호하는 실습유형에 대해 살펴보았다. 선행연구에서 도출된 실습가치 26개 항목과 실습교육의 운영에 구체적으로 고려해야 하는 5개요인을 조합해 도출된 여덟 개의 실습유형을 조사에 이용하였다. 자료수집은 경북지역에 소재한 대학에서 관광을 전공하고 있는 학생들을 대상으로 이루어졌으며 132명이 조사에 참여하였다. 분석방법으로는 문화합의분석(cultural consensus analysis)을 이용하였는데, 문화합의분석은 응답자들의 동의유형을 통해 문화적으로 정의된 올바른 답을 찾아내는 것을 목적으로 하는 조사방법이다. 분석결과 실습가치와 선호하는 실습유형에 학생들 간에 응집된 문화가 존재하지 않는 것으로 나타났다. 문화적 합의가 없어 의미가 약화되었지만 학생들이 가장 중요하게 여기는 실습가치는 “외부에서 보는 업무와 현실적인 업무의 차이 파악”으로 나타났다. 본 조사에서 문화적 합의가 관찰되지 않은 것은 현장실습이 학생들에게 미지의 영역이며 또한 다측면적인 인지대상임을 반영한다고 할 수 있다. 또 이러한 결과는 실습과목의 개발에 있어 학생보다는 교수와 기업실무자의 전문성에 의존한 위로부터의 결정방식이 적합함을 시사한다고 할 수 있다. Field experiences have been gaining importance in higher education in Tourism., This study examined the benefits of field studies classes and type of the class formats preferred by students. 26 benefit items adopted from another study and eight different class formats created by the researchers were used for the study. 132 students majoring in tourism in a university based in Kyungsangbuk-do region participated in the survey, and the data was analyzed using cultural consensus analysis. Cultural consensus analysis aims to find culturally defined correct answer using patterns of agreement among respondents. The result shows that there was no consensus in the two proposed areas. Although less meaningful due to the lack of consensus, "understanding the gap between the external view and first-hand experience of the job" appeared to be the most important perceived benefit associated with field studies. The lack of consensus might be due to that field class is relatively unknown an area for the students with only vague knowledge of what to expect and/or it is a multifaceted theme that contains varied aspects to consider. Such a result seems to suggest that developing field education program requires not so much inputs from the students but it needs to rely more on knowledges and experiences of educators and practitioners.