분극전계가 모포트로픽 상경계 부근의 PZT 세라믹스의 공진주파수의 온도의존성에 미치는 영향

梁正普(Jung-Bo Yang),梁完碩(Wan-Seok Yang),李開明(Gae-Myoung Lee) 대한전기학회 2008 전기학회논문지 Vol.57 No.7

Poling is an important process in fabricating PZT ceramic devices such as filters and resonators and activates piezoelectricity to sintered PZT ceramics. Tolerance of the operating frequency of these devices is tightly required in applications. And a factor to attribute the tolerance is the temperature dependence of the resonance frequency of PZT ceramics. In this paper the relationship of poling strength and temperature dependence of resonance frequency of PZT specimens was studied. The Pb(Zr0.53Ti0.47)O₃ ceramics were fabricated and the poling strengths were chosen to be 0.5, 1.5, 2.5 and 3.5 [㎸/㎜]. The dielectric constant of the specimen poled in poling strength 0.5 [㎸/㎜] was less than that of unpoled specimen and the specimen poled in higher electric field had the higher dielectric constant. (002) peak in X-ray diffraction patterns of the specimens increased as poling strength increased. And the change of resonance frequency of the specimens according to the variation of temperature was measured. Resonance frequency of all specimens increased as the temperature increased. The specimen poled in higher electric field had the smaller positive temperature coefficient of resonance frequency. The effect that temperature coefficient of resonance frequency becomes smaller is obtained when Zr mole in PZT composition equation increase. Controlling the poling strength is believed to be a method to adjust the temperature stability of resonance frequency of the PZT ceramic devices.

커피원두와 커피박 추출물의 항산화능 비교

양선임(Yang, Sun-Im),김혜진(Kim, Hye-Jin),양윤선(Yang, Yun-Sun),오병석(Oh, Byung-Seok),김동청(Kim, Dong-Chung) 한국외식산업경영학회 2014 외식산업경영연구 Vol.10 No.1

커피원두와 커피박 추출물의 항산화 활성을 비교하였다. 커피원두와 커피박 추출물의 페놀성화합물 함량은 각각 17.3μg/mg과 20.1μg/mg으로 나타났다. 환원력의 EC50은 커피원두와 커피박 추출물에서 각각 11.50μg/ml과 10.80μg/ml이었고, 유리라디칼 소거능의 EC50은 커피원두와 커피박 추출물에서 각각 14.16μg/ml과 14.12μg/ml로 나타났다. 커피원두와 커피박 추출물의 농도를 증가시킬수록 환원력과 유리라디칼 소거능도 비례하여 증가하였다. 따라서 커피박 추출물은 커피원두 추출물에 뒤지지 않는 우수한 항산화 활성을 보유하고 있었다. In this study, antioxdative ability between coffee bean and coffee waste extracts was compared. Total phenolic contents of coffee bean and coffee waste extracts were 17.3 μg/mg and 20.1 μg/mg, respectively. EC50 values of coffee bean and coffee waste extracts for reducing power were 11.50 μg/ml and 10.80 μg/ml, respectively. Also, their EC50 values for free radical scavenging activity were 14.16 μg/ml and 14.12 μg/ml, respectively. Their reducing power and free radical scavenging activity increased as their concentration increased. Thus, coffee waste extract possessed a potent antioxidative potential.

한국 랩의 형성과 케이팝의 발전

양우석 ( Woo Seok Yang ) 한국음악학학회 2012 음악학 Vol.20 No.2

2012년 현재, 우리나라 대중가요시장은 케이팝을 중심으로 움직이고 있는 것으로 보인다. 대중가요시장은 일제 강점기와 군사독재 기간을 거치면서 ``스 타 시스템``에 의해 움직이는 비저항적 음악들에 의해 시장을 주도당했고, 여기 서 이른바 ``가요의 대부분은 사랑 타령``이라는 비판적 시각이 초래된 것으로 보인다. 민중가요나 포크, 록 등, 저항성을 추구하며 구축된 대중가요가 있었으나 주류 대중음악이 되기에는 어려운 여건들이 오랜 시간 동안 존재하고 있었다. 이런 분위기는 문민정부 이후에도 꾸준히 지속되어 공영방송국과 심의위원회 등의 제재 속에서 음악인들은 체제순응적인 음악들을 만들어 왔다. 힙합문화가 1990년대 이후 한국에 유입되면서 생긴 특별한 현상은 특히 ``랩``이다. 1992년 등장한 서태지는 한국 랩을 정착시키는 데 큰 역할을 했으며, 다수의 가수들이 서태지와 같은 방법으로 랩 음악을 수용하여 자신들의 음악 에 적용시키는 과정을 통해 케이팝은 현재의 모습이 되었다. 힙합 문화의 저항정신과 그래피티, 디제잉 등은 소극적으로 수용되고 비보 잉은 ``군무``로, ``랩``은 부수적인 역할을 담당하며 현재의 케이팝의 모습으로 변형된다. 이는 우리나라 특유의 문화적 환경 때문이며 세계적인 위상을 획득한 케이팝은 기성세대와 단절된 간극을 유지한 채 발전을 이어가고 있다. 본고는 한국 랩의 형성과 케이팝의 발전에 관해서 연구한다. The market of popular songs in Korea is revolving around K-Pop. The popular songs which started to gel into the proper shape through Japanese colonial era when the popular songs were generated were taken the lead of the market by the resistivity music revolved by the ``star system`` during the military dictatorship period, and it seems that the critical perspective like ``Most of the songs are all about love story" caused at this time. Although protest song, fork or rock, etc. pursued resistiveness, the difficult conditions to be the mainstream popular music formed the groundwork for a long period of time. This atmosphere continued even after the civilian government and musicians have steadily made the conformist music through the sanctions by the public service broadcaster. Seo Taiji who appeared in 1992 seems to have played a large role in settling the Korean rap and number of singers accepted the hip-hop culture like Seo Taiji and K-Pop got the current shape through the process of applying it to their music. However, in the process of their spirit of hip-hop transformed into K-Pop, castration of another spirit of resistance was made. Although the resistance contents, graffiti, DJing, B-boying, etc. which are the important part of the hip-hop culture are ignored and ``rap music`` exists, it should be transformed into current K-Pop which doesn`t take the role and can be the localized product of hip-hop. It seems that it is because of our unique cultural environment and K-Pop which acquired a global presence has developed, maintaining the disconnected gap between the older generation. This paper studies the The Formation of Korean Rap and Development of K-Pop.

IoT 기반 실내 공기질 모니터링용 소형 저전력 복합환경센서 구현

양우석(Woo Seok Yang),이형근(Hyung-Kun Lee),전영득(Young-Deuk Jeon) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.11

사과(홍로, Malus Pumila) 고사와 관련한 토양 이화학적 해석

이종은(Jong-Eun Lee),윤여옥(Yeo-Uk Yun),장준택(Jun-Taek Chang),이진일(Jin-Il Lee),이봉춘(Bong-Chun Lee),양의석(Eui-Seok Yang) 한국토양비료학회 2008 한국토양비료학회 학술발표회 초록집 Vol.2008 No.9

미생물을 이용한 절삭유제의 부패성능 평가에 관한 연구

양대석 ( Dae Seok Yang ),홍광민 ( Kwang Min Hong ),정근우 ( Kun Wo Chung ),김영운 ( Young Wun Kim ) 한국공업화학회 2001 응용화학 Vol.5 No.1

랜더링 고형잔류물 Biochar의 화학적 특성

윤진주(Jin-Ju Yun),박종환(Jong-Hwan Park),강세원(Se-Won Kang),이승규(Seung-Gyu Lee),김소희(So- Hui Kim),백준석(Baek-Jun Seok),양하현(Yang-Ha Hyeon),조주식(Ju-Sik Cho) 한국토양비료학회 2019 한국토양비료학회 학술발표회 초록집 Vol.2019 No.8

사과(흥로,Malus Pumila) 고사와 관련한 토양 이화학적 해석

이종은 ( Jong Eun Lee ),이진일 ( Jin Il Lee ),이봉춘 ( Bong Chun Lee ),윤여욱 ( Yeo Uk Yun ),장준택 ( Jun Taek Chang ),양의석 ( Eui Seok Yang ) 한국토양비료학회 2008 한국토양비료학회 학술발표회 Vol.2008 No.1

고령 갑상선암 환자의 갑상선 절제술의 안정성

양승윤(Seung Yoon Yang),김석모(Seok Mo Kim),김수영(Soo Young Kim),김법우(Bup Woo Kim),이용상(Yong Sang Lee),박정수(Cheong Soo Park),장항석(Hang Seok Chang) 대한두경부종양학회 2016 대한두경부 종양학회지 Vol.32 No.2

Background and Objectives: The aim of this study was to evaluate the safety and the feasibility of thyroidectomy for aged (≥ 75 years old) thyroid cancer by reviewing postoperative morbidity and pathologic characteristics. Materials & Methods: The clinical records of patients submitted to thyroid operation between 2014 and 2015 with histopathological diagnosis of thyroid cancer were analyzed. Clinical variables included age, gender, pre-operative symptom, final pathology, length of stay, comorbidities, American Society of Anesthesiologists score, postoperative complications, and mortality. Results: There were 30 patients aged more than 75 years old, and only one patient passed over with postoperative pneumonia. There were 8 male and 22 female patients. Half of the patients presented with symptoms such as palpable mass (33.3%), voice change (6.7%) and dyspnea (6.7%). The pathologic diagnosis was thyroid cancer in all cases. The median postoperative hospitalization time was 4 days. There was one perioperative mortality case observed in this study. Conclusion: Thyroid surgery in patients 75 years or older can be performed except extensive surgical resection. Aggressive histology and extent of surgery may be an important factor of perioperative mortality and morbidity.

박시춘 작품의 음악적 특징: 한국전쟁 이전 작품을 중심으로

양우석 ( Woo Seok Yang ) 한국음악학학회 2014 음악학 Vol.22 No.1

한국의 대중가요는 일제강점기를 거치면서 성립되었다. 여기에는 음반산업 이라는 매개가 중요한 영향을 주었다. 3000여곡이라는 많은 노래를 작곡한 박시춘은 한국가요사에 있어서 주류 작곡가로서 거론이 된다. 타계 4주기를 맞아 김점도에 의해 주도된 『박시춘 명작집 - 애수의 소야곡』 에 수록된 300곡의 가요는 그의 대표적인 작품이라 할 수 있을 것이다. 본고에서는 300곡의 수록곡 중에서 1950년 이전의 노래 122곡을 분석할 것이다. 요나누키 단음계의 무분별적 수용으로 인한 한국대중가요의 폄하와 근거 없는 한국대중가요의 정체성에 관한 주관적 접근에 대한 문제와 함께 판소리의 음계와 비교분석을 통해 한국대중가요의 주요 요소인 선율구조를 자세히 조사하여 한국전통음악과 한국대중음악의 연결 고리를 찾고자 한다. 1950년 이전을 기점으로 삼는 이유는 6.25전쟁 이후가 미8군을 통해 유입된 서양의 선율이 강한 영향을 준 시기이기 때문이다. 박시춘의 작품이 모든 한국대중가요를 대표한다고 말할 수는 없지만 많은 영향을 준 것이 사실이기 때문에 그의 음악의 분석을 통한 한국대중가요의 정체성에 관한 접근은 의의가 있다고 생각된다. Korean pop music was shaped during the period of Japanese occupation in Korea, and it was greatly influenced by the medium called the recording industry. As the renowned Korean pop composer of over 3,000 songs, Park Shi-Choon is referred to as a major songwriter in the history of Korean pop music. In honor of Park, Shi-Choon who passed away 4 years ago, Park Shi-Choon’s Masterpieces: The Serenade of Sorrow was created with the great support and interest of many pop musicians, which could be considered as his sole collection initiated by Kim Jeom-Do. Any incomplete music transcription was modified indeed in this paper. Park Shi-Choon is remembered as a great songwriter with a copious number of hits and his music is still being played in KBS 1TV - Gayo Stage on almost every week. According to MBC’s survey in 1981, 10 songs of his were listed in Koreans’ top 100 favorite songs, and this represents that he greatly influenced on a history of Korean songs and ballads. Although every check on his 3,000 songs in total was not made, the 300 songs listed on Park Shi-Choon’s Selection of Masterpieces could be recognized as his representative works. This paper intends to analyze the 122 songs out of his 300 ones, which were composed before 1950. Facing the derogation on Korean pop music with the indiscriminate acceptance of yonanuki minor scale and the groundless subjective approach to the identity of Korean pop music, this paper also attempts to find the link between Korean music and Korean pop music by thoroughly examining the melodic structure which is an essential element of Korean pop music through the comparative analysis with pansori scale. The period of Pre-1950 was set as starting point for this analysis because Korean pop music was greatly influenced since the Korean War due to the inflow of the Western melody from the 8th US Army. Park Shi-Choon’s works can hardly be called representative of all Korean pop music, but no one can deny the fact that they had a profound effect on it. In this regard, it is considered that an approach to the identity of Korean pop music through the analysis of his musical works has a great significance.