스미어링 기법과 윤곽선 추적 알고리즘을 이용한 영문 명함 영상에서의 문자 추출 ( The Extraction of Character from an English Name Card by Using Smearing Method and Contour Tracking Algorithm )

조아현,이혜현,류재욱,김광백 한국지능정보시스템학회 2002 한국지능정보시스템학회 학술대회논문집 Vol.- No.-

Plastic Crystal-Based Composite Elastomer Electrolytes: Achieving High Lithium-Ion Conducting and Stable Lithium-Metal Batteries

조아현,제지향,최우혁 한국고분자학회 2024 한국고분자학회 학술대회 연구논문 초록집 Vol.49 No.2

약수터 음용도구의 Bacillus cereus 분포 및 독소 특성

조아현,최하나,허단비,권순목,김중범 한국식품위생안전성학회 2017 한국식품위생안전성학회지 Vol.32 No.1

The purpose of this study was to investigate the microbiological contamination of water and drinking cups in springs and to estimate the toxin gene, enterotoxin production ability and antibiotic susceptibility of foodborne pathogens. Ten spring water and 34 drinking cups were tested. The average number of total aerobic bacteria and coliform bacteria in spring water were 1.8 log CFU/mL and 1.2 log CFU/mL, and in drinking cups were 4.7 log CFU/ 100 cm2 and 1.7 log CFU/100 cm2. Salmonella spp., Staphylococcus aureus, E. coli O157:H7, Listeria monocytogenes, Vibrio parahaemolyticus, Yersinia enterocolitica were not isolated from all of samples but Bacillus cereus was detected in 5 (14.7%) of 34 drinking cups. The nheA and entFM genes were major enterotoxin genes in B. cereus isolated from drinking cups. All of B. cereus tested in this study produce non-heamolytic enterotoxin but only 2 isolates possessed heamolysin BL enterotoxin producing ability. B. cereus was resistant to β-lactam antibiotics. These results revealed that the sanitary conditions of drinking cups in spring should be improved promptly. The substitution carrying a personal drinking cup for the public drinking cups equipped in springs is suggested to prevent food-borne illness.

습도조건에 따른 PEG 처리 수침고목재의 PEG 용출량 및 압축강도 변화

조아현,이광희,최태호,고인희,서정욱 한국문화재보존과학회 2020 보존과학회지 Vol.36 No.3

The present study aimed to monitor changes in the amount of PEG free-flowing back from PEG-treated woods and compressive strength changes with change in relative humidity from 90% to 30%. The change in the relative humidity was done 3 times. For the current study, water-logged wood (Prinus group) was used and the wooden blocks cut out of it were subjected to 3 different impregnation methods combined with different drying conditions as follows: 1) impregnating with 80% PEG#4000 followed by drying in nature (hereafter PEG80), 2) impregnating with 40% PEG#4000 and then drying in vacuum freeze drying equipment (hereafter PEG40), and 3) impregnating with 40% PEG#4000 in t-butanol, followed by drying in the vacuum freeze drying equipment (hereafter TB40). It was verified that most of the PEG was free-flowing back from the PEG-treated woods; however, a small amount of left PEG was observed on the lumen surface. The amount of PEG free-flowing back from the PEG-treated woods increased whenever the relative humidity changes from 90% to 30%. The compressive strengths of PEG80 and TB40 were increased whenever the relative humidity changed from 90% to 30%, whereas PEG40 decreased. The current study showed how to control the relative humidity to effectively manage PEG-treated waterlogged woods. 본 연구는 PEG 함침처리한 수침고목재를 대상으로 고습도(RH 90%)에서 저습도(RH 30%)로습도변화를 주면서 목재 내부에 있는 PEG 및 약제 용출량과 압축강도 특성 변화를 관찰하기 위해 수행되었다. 고습도에서 저습도로의 변화는 3회 실시하였다. 시험에 사용된 수침목재는 졸참나무류(Prinus group)이며, 함침 및 건조 방법은 1) PEG 완료농도 80% 및 자연건조(이하 PEG80), 2) PEG 완료농도 40% 및 진공동결건조(이하 PEG40), 그리고 3) t-butanol을 이용한 PEG 완료농도 40% 및진공동결건조(이하 TB40) 이다. 목재 내부에 있는 PEG는 3차 습도변화 이후에 대부분 용출되어 제거되었으며, 내강 벽면에 남은 PEG의 결정이 편평하게 고착되었다. 약제의 용출량은 대부분의 경우 습도변화 횟수가 증가할수록 그 양이 증가하였다. 습도조건에 따른 압축강도의 변화는 PEG80 과 TB40의 경우 습도변화 횟수가 증가할수록 증가하였으나, PEG40은 감소하였다. 본 연구를 통해PEG 처리된 수침고목재 보존을 위한 습도조건에 대한 계획 마련에 필요한 기초자료가 마련되었다.

사운드워킹을 통한 청주시 도심지역 음풍경 조사

조아현,박찬재,한찬훈 한국음향학회 2021 한국음향학회지 Vol.40 No.6

The present study investigated the sounds at 13 points in the four districts in Cheongju including commercial district, historic district, urban walking district and university campus in order to realize the soundscape of the city. In order to this, questionnaire survey was conducted to 65 citizens and 5 acoustic experts on sites to find both sound loudness and annoyance of each district. At the same time, information about loud, unpleasant, preferred and representative sound of each district were acquired by selecting three from 35 sounds which consist of natural, artificial and machinery sounds. As a result, it was found that there is a very close correlation between sound loudness and annoyance. Through the analysis of sounds at each district, it was revealed that machinery sounds dominate in commercial area as figure sound, It was also shown that artificial and natural sounds dominate in historic area, artificial sounds in both urban area and university campus respectively. Laboratory listening tests were undertaken to 20 people using recorded sounds and video captured on site. The results denote that machinery and artificial sounds are regarded as most loud, machinery sounds as most unpleasant, natural and artificial sounds as most pleasant which shows similar tendency of on-site evaluation. 본 연구는 청주시의 음풍경을 파악하기 위하여 도심 지역을 특징에 따라 상업지역, 역사지역, 도심보행지역, 대학캠퍼스지역의 4가지로 구분한 뒤 총 13개 장소에서 발생되는 소리를 사운드워킹을 통하여 조사하였다. 이를 위하여 음향전문가 5인과 일반시민 65명을 대상으로 설문조사를 수행하여 지역별 소리의 크기와 불쾌감에 대해서 주관적으로 평가하도록 하였다. 또한 자연음, 인공음 및 기계음으로 구성된 35개의 신호음 보기 중 3가지를 선택하여 큰 소리, 불쾌한 소리, 듣기 좋은 소리, 대표 소리에 대한 정보를 취득하였다. 현장평가 결과, 소리의 크기와 불쾌감 사이에 매우큰 상관관계가 있음을 알 수 있었다. 또한 지역별 신호음을 분석한 결과 상업지역은 기계음, 역사지역은 인공음과 자연음이 그 장소를 대표하는 소리로 나타났으며 도심보행지역과 대학캠퍼스의 대표 소리는 인공음인 것으로 나타났다. 한편 현장평가시 각 측정점의 상황을 녹음 및 녹화한 뒤 이를 이용해 실험실에서 20인을 대상으로 청감평가를 수행하였다. 실험실평가 결과 가장 크게 들리는 소리는 기계음과 인공음, 가장 불쾌하게 들리는 소리는 기계음, 가장 듣기 좋은 소리는 자연음과 인공음으로 나타나 현장평가와 유사한 경향성을 보여주고 있었다.

가래떡에 오염된 곰팡이와 효모의 분리 동정

조아현,김중범 한국식품위생안전성학회 2022 한국식품위생안전성학회지 Vol.37 No.1

The purpose of this study was to analyze the hazard of fungi in Garaetteok (Korean rice cake) byisolating and identifying of fungi contaminated with Garaetteok and investigating the possibility of mycotoxin production. Garaetteok used in this study were the ones that were returned back to the manufacturers in Jeollanam-dodue to the presence of foreign matters presumed to be fungi. The fungi foreign matter was collected and inoculatedon Potato dextrose agar, Malt extract agar, and Czapek yeast extract agar, and then cultured at 25oC for 7 days. Themicro-structure was observed under an optical microscope for the colonies in which pure isolation was confirmed. Thegene sequencing of the product of amplified PCR was analyzed using the ITS primer. Colony-1 and 2 maintained thesame properties in each tray, confirming that they were purely isolated. Budding cells were observed from the Colony-1, thus, it was determined to be yeast. Colony-2 was determined to be a fungus that belongs to Fusarium spp. as fusiformconidia were observed. As a result of gene sequencing, a total of 76 cases of fungi of Fusarium spp. were found,among which Fusarium solani was the most observed cases (53 cases). From the morphological and genetic identification,Colony-2 was identified as Fusarium spp., specifically, Fusarium solani. The fungi found in Fusarium spp. produce mycotoxins such as nivalenol, zearalenone, and fumonisin, which may cause vomiting, diarrhea, and cancer. Conclusively, the results confirm the possibility of mycotoxin production by Fusarium spp. isolated from Garaetteok. Consequently, when an unknown fungus was found, it is necessary to isolate and identify the fungus, determinewhether it is a mycotoxin producing species, and strengthen relative administrative measures, accordingly. 본 연구에서는 가래떡에 오염된 곰팡이를 분리 동정한후 곰팡이독소 생산 가능성을 조사하여 식품 이물 중 곰팡이에 대한 위험성을 분석하였다. 실험에 사용된 가래떡은 전라남도 소재 떡 제조업체에 곰팡이로 추정되는 이물이 발견되어 반품된 제품을 사용하였다. 곰팡이 이물을 채취한 후 Potato dextrose agar, Malt extract agar, Czapekyeast extract agar에 접종하고 25oC에서 7일간 배양하여순수 분리 결과를 판단하였다. 순수 분리가 확인된 집락에 대해 광학현미경으로 포자의 미세구조를 관찰하여 형태학적으로 동정하였다. 유전학적 동정은 ITS primer를 이용하여 증폭된 PCR 산물의 유전자 염기서열을 분석하였다. Colony-1과 2는 각각 배지에서 동일한 성상을 나타내어 순수분리 되었음을 확인하였다. Colony-1은 출아세포가 관찰되어 효모로 판정하였다. Colony-2는 방추형의 분생자가 관찰되어 Fusarium 속 곰팡이로 판정하였다. 유전자 염기서열 분석 결과 Fusarium 속 곰팡이가 총 76건으로 나타났으며, 그중 Fusarium solani가 53건으로 가장 높게 나타났다. 형태학적 동정 결과와 유전학적 동정 결과를 바탕으로 Colony-2는 Fusarium spp.로 동정되었고 그중 Fusarium solani로 추정되었다. Fusarium 속 곰팡이는Nivalenol, Zearalenone, Fumonisin 등의 곰팡이독소를 생산하여 구토, 설사, 암 등을 유발한다. 이러한 결과를 종합해 볼 때 가래떡에서 분리된 Fusarium 속 곰팡이에 의한 곰팡이독소 생산 가능성은 상존하는 것으로 판단되었다. 따라서 곰팡이 이물이 보고되면 곰팡이를 분리 동정하여 곰팡이독소를 생산할 수 있는 균종인지 판단하고, 그결과에 따라 행정조치를 강화하여야 할 것으로 판단된다.

인적 유대와 국가문화적 맥락이 세계 정신 건강에 미치는 영향: 국제사회조사프로그램 (ISSP) 2017년 자료 분석

조아현,김현수 한국사회학회 2024 한국사회학회 심포지움 논문집 Vol.2024 No.6

청감실험방식에 따른 음풍경 평가결과 비교분석

조아현,한찬훈,Jo, A-Hyeon,Haan, Chan-Hoon 한국음향학회 2022 한국음향학회지 Vol.41 No.3

The present study aims to investigate the difference of soundscape evaluation results from on-site field test and laboratory test which are commonly used for soundscape surveys. In order to do this, both field and lab tests were carried out at four different areas in Cheongju city. On-site questionnaire surveys were undertaken to 65 people at 13 points. Laboratory listening tests were carried out to 48 adults using recorded sounds and video. Laboratory tests were undertaken to two different groups who had experience of field survey or not. Also, two different sound reproduction tools, headphones and speakers, were used in laboratory tests. As a result, it was found that there is a very close correlation between sound loudness and annoyance in both field and laboratory tests. However, it was concluded that there must be a difference in recognizing the figure sounds between field and laboratory tests since it is hard to apprehend on-site situation only using visual and aural information provided in laboratory tests. In laboratory tests, it was shown that there is a some difference in perceived most loud figure sounds in two groups using headphones and speakers. Also, it was analyzed that there is a tendency that field experienced people recognize the figure sounds using their experienced memory while non-experienced people can not perceive the figure sounds.

음성신호를 이용한 딥러닝 기반 우울증 진단 연구 동향 분석

조아현,염찬욱,곽근창 제어로봇시스템학회 2021 제어로봇시스템학회 국내학술대회 논문집 Vol.2021 No.6

Depression is a common mental illness in modern society, and research on technologies that depression diagnosis using artificial intelligence has actively proceeded recently. In this paper, of the many artificial intelligence technologies, we analyze research trends on techniques for diagnosing depression based on deep learning models using speech signals. Specifically, deep learning models are presented such as CNN(Convolutional Neural Networks) and LSTM(Long-Short Term Memory), and methods for applying speech signals to deep learning models. Also, databases are described such as DAIC-WOZ(Distress Analysis Interview Corpus) database and AVEC2013(Audio-Visual Emotion recognition Challenge) depression database used for speech signal-based depression diagnosis.

설문조사를 통한 공동주택 생활소음 인식 조사

조아현,송국곤,정진연 한국소음진동공학회 2025 한국소음진동공학회 논문집 Vol.35 No.1

This paper presents the findings of a questionnaire survey conducted to examine the current status and perceptions of living noise, a common issue in apartment buildings. A total of 504 respondents participated in the survey, which covered topics such as general information, living noise, floor impact noise, and bathroom noise. The most frequently reported disturbances from neighbors were, in order: children running, bathroom drainage noise, and adult walking. The living room and the main bedroom were identified as the primary spaces affected by living noise. When elementary school-aged children or preschoolers resided in the upstairs apartment, the frequency and severity of floor impact noise were notably higher. Additionally, noise from neighboring bathrooms, as heard from the main bedroom, included not only drainage noise but also talking, showering, and urination. To address the issue of living noise in apartment buildings, it is recommended to develop technologies that mitigate floor impact noise through improved floor coverings and reduce bathroom noise transmission effectively.