홀센서 집게형 맥진기 요골동맥파에 FFT를 적용한 호흡수 추출 연구

조현성(Hyun-Sung Cho),이상석(Sang-Suk Lee) 한국자기학회 2012 韓國磁氣學會誌 Vol.22 No.5

This research suggested that the extraction of respiratory rate could be made possible by using frequency analysis in the data process for clip-type pulsimeter equipped with permanent magnet and Hall sensor. The pulse analysis included of cardiac motion information depending on variation of pulse waveforms is investigated by means of Fast Fourier Transformation (FFT). The peaks of FFT spectrums measured at 15, 20, 30, 40, and 50 tempos are coincided to each respiratory rate having 0.125 Hz, 0.16 Hz, 0.25 Hz, 0.33 Hz, and 0.41 Hz, respectively. The FFT spectrum using algorithm for the extraction of respiratory rate showed the best pulse waves measured during 300 s. Based upon these results, the clip-type pulsimeter could extract the effective respiratory rate reflecting physical effects.

모바일 환경에서 공공데이터와 공개API를 이용한 매시업 활용방안

조현성 ( Hyun-sung Jo ),박석천 ( Seok-cheon Park ),박준식 ( Jun-sik Park ) 한국정보처리학회 2013 한국정보처리학회 학술대회논문집 Vol.20 No.2

모바일 디바이스가 확산 된 이후 대다수 사용자는 PC의 웹브라우저 보다는 모바일 웹브라우저를 이용하고 있다. 모바일 환경에서 매시업은 최근 몇 년 동안 상당한 관심을 받고 있으며, 정부 3.0이 주도되면서 공공데이터의 공개가 활성화되고 민간기업도 API를 공개 하고 있다. 따라서 본 논문에서는 모바일환경에서 공공데이터와 공개API를 이용한 매시업 활용방안을 연구 및 분석한다.

횡류형 터빈을 적용한 수직축 풍력발전시스템의 성능평가를 위한 실험 연구

조현성(Cho, Hyun-Sung),정광섭(Chung, Kwang-Seop),김철호(Kim, Chul-Ho) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.3

본 최근 성장하고 있는 해상 풍력의 실험연구에서 풍동시험이 수직형 횡류 풍력발전시스템의 성능을 조사 하기 위해 실시되었다. 풍동의 시험 부분은 제한된 크기로 인해 실제 풍력 발전의 입구 안내 베인을 약 1/5로 축소시 켰고, 터빈 임펠러의 지름을 모형 임펠러의 1/2로 감소시켰다. 임펠러 블레이드 갯수는 풍력 발전 시스템의 출력에 대 한 또 다른 중요한 변수이기 때문에 8개와 16개로 변경하여 시험하였다. 실험 분석 결과, 모형 풍력 터빈의 출력 제동력은 정격 풍속 12m/s에서 블레이드 갯수가 8개 보다 16개일 때 82% 출력이 증가된 278와트로 측정되었고, 정격 제동력은 정격 작동 조건에서 3.9kW로 계산되었다. In this experimental study for the current growing offshore wind, a wind tunnel test was conducted to examine the performance of the vertical-type cross-flow wind turbine power generation system. Due to the limited size of the test section of the wind tunnel, the inlet guide vane of the original wind power generation was scaled down to about 1/5 and the turbine impeller diameter was also reduced to 1/2 of the prototype impeller. The number of the impeller blade is another important parameter to the output power of the wind power generation system and the number was varied 8 and 16. From the analysis of the experimental result, the output brake power of the model wind turbine was measured as 278watts with the 16-blade at 12 m/s of the rated wind speed and the rated brake power of the prototype wind turbine is calculated to 3.9kW at the rated operating condition.

실험연구 : 백서의 족관절 염좌모델에서 전기침구에 효과적인 침구점

조현성 ( Hyun Sung Cho ),양미경 ( Mi Kyung Yang ),유래근 ( Rae Geun Yoo ),함태수 ( Tae Soo Hahm ) 대한마취과학회 2006 Korean Journal of Anesthesiology Vol.51 No.3

Background: The stimulation and selection of an effective acupoint is important for producing effective analgesia in electraoacupuncture. This study examined the effect of electroacupuncture to different acupoints and investigated the effective acupoint for ankle-sprained pain in rats. Methods: A Sprain was produced by manually overextending the lateral ligament of the right ankle in rats. Electrical stimulation was delivered individually to five acupoints: bilateral Yangno (SI6s), contralateral Zusanli (ST36), Hapko (LI4) and Sanyinjiao (SP6). The level of pain evoked by ankle sprain was measured by the stepping force of the sprained paw during walking at pre-sprain and 24 hrs after the sprain. The effect of electroacupuncture was evaluated by the % full recovery of the stepping force at 1, 2, 4 hr after terminating electroacupuncture. Results: Electrical stimulation to SI6 and ST36 among the five acupoints produced a significant increase in the % full recovery of the stepping force of the ankle-sprained paw during walking. Conclusions: The effective acupoints for electroacupuncture on ankle-sprained pain in rats is SI6 and ST36. These points are relatively specific to ankle-sprain. It is important to select the appropriate acupoint for effective electroacupuncture-induced analgesia. (Korean J Anesthesiol 2006; 51: 354~8)

다국적기업의 해외시장진입유형 결정요소에 과한 메타분석 -국제기업협력 vs 100% 투자-

조현성 ( Sung Hyun Cho ) 한국통상정보학회 2009 통상정보연구 Vol.11 No.1

In this study aims to research and analyze what are decision factors between a wholly-owned subsidiary and a international company cooperation in the internationalization process. From 57 primary studies found 26 observed variables for aggregation of effect size in the using "Fixed Effect Model" on this mata-analysis. The article also links the theories that are used in the literature, not considered in the most of primary studies, to the empirical results and recommends global management strategy which is needed for business practical affairs. According to the result, the meta-analysis suggests that the number of employees of a MNC, the geological and cultural differneces between the host country and home country, the country-specific international experience of the MNC and export intensity, the international product diversification, the market growth and the market size of the foreign operations, and resource intensity of the foreign operations, the legal restrictions in the host country and the country risk of the home country do exert a significant effect on the decision between cooperative arrangement and a wholly-owned subsidiary. Conversely, for a large number of variables, no significant relationship seems to exist based on the combined results. This is the case, for example, for factor specificity, the r&d-intensity, the subsidiary size, the assets of the MNC and the sales volume of the MNC.

신경회로망과 유전 알고리즘을 이용한 유전자 추출법과 이의 암 분류법에의 적용

조현성(Cho Hyun Sung),김태선(Kim Tae Seon),전성모(Jeon Sung Mo),위재우(Wee Jae Woo),이종호(Lee Chong Ho) 대한전기학회 2002 대한전기학회 학술대회 논문집 Vol.2002 No.7

mPetCare : 공공데이터를 활용한 반려동물 케어 시스템 설계 및 구현

조현성 ( Hyun-sung Jo ),박석천 ( Seok-cheon Park ),박준식 ( Jun-sik Park ) 한국정보처리학회 2013 한국정보처리학회 학술대회논문집 Vol.20 No.2

최근 핵가족과 고령화 등의 영향으로 반려동물과 함께 생활하는 사람들이 많아지고 있다. 특히, 1인 가구의 증가로, 외로움을 타는 현대인이 증가하면서 반려동물을 가족으로 인식하는 이들이 많아졌다. 따라서, 본 논문에서는 반려동물의 소유주들이 직면하는 문제점들을 해결하기 위하여 공공데이터를 활용한 반려동물 케어 시스템을 설계 및 구현하고, 이를 통해 반려동물을 원할히 관리 할 수 있도록 하였다.

RFID를 이용한 맞춤형 융·복합 생산관리시스템(MES) 개발에 관한 귀납법적 연구

조현성(Cho, Hyun sung) 한국전시산업융합연구원 2020 한국과학예술융합학회 Vol.38 No.2

본 연구는 귀납법적 접근방법으로 RFID를 각 생산 어플리케이션 간 통신수단으로 채택한 생산관리시스템(MES)에서 시작되었다. 연구대상의 MES는 Festo Didactic사에서 개발한 스마트팩토리 모듈로 구성된 실제 생산 라인이다. MES는 Microsoft Visual Studio를 사용하여 C# 언어로 객체 지향 프로그래밍 방식으로 작성되었다.[3] 본 연구의 목적은 사이버·물리시스템(CPS) 운영 및 데이터관리를 위해 MES 시스템 개요, MES 통신에 적용하는 RFID 기술의 기본기능, MES에서 RFID를 이용한 통신방법, 동작 알고리즘과 실시간 작업 모듈별 데이터 관리 방법을 제시하고 설명한다. 연구결과 및 내용은 다음과 같다. 첫째, RFID센서를 활용하여 실시간으로 데이터를 MES와 통신하는 방법을 예증한다. 둘째, 향후 RFID를 활용한 MES를 개발하기 위한 선행 MES를 귀납적으로 접근하여 분석하여 제시한다. 마지막으로 논제와 직·간접으로 관련된 선행연구, 이론 및 주장을 비교하였다. 이러한 연구결과를 바탕으로 전제된 RFID와 MES 간의 연동조건, 알고리즘, 통신방법과 데이터베이스 관리를 참조하여 일반적인 글로벌 저가형 MES가 출시되기를 기대한다. This paper examines a production management system (MES) that adopted RFID as a communication method between each production application as a bottom-up approach. The research target MES is a real production line composed of smart factory modules developed by Festo Didactic GmbH & Co. KG in Germany. MES program was coded object-oriented programming in C # language using Microsoft Visual Studio[3]. The purpose of this study is to show and explain about the MES system overview for cyber-physical system (CPS) operation and data management, basic functions of RFID technology applied to MES communication, communication method using RFID in MES, operation algorithms, and data management by real-time work modules. The research results and contents are as follows; First, it demonstrates how to communicate data with MES in real time using RFID sensors. Second, it analyzes and presents an bottom-up approach to the leading MES in order to develop MES using RFID in the future. Lastly, we compared previous studies, theories, and claims related to thesis directly or indirectly. It is expected that a low-cost MES with a global and scalability will be released with reference to the interoperable conditions, algorithms, communication methods and database management between the RFID and MES based on these research results.

실험연구 : 백서의 족관절 염좌모델에서 동시에 적용한 전기침구가 염좌 통증에 미치는 효과

조현성 ( Hyun Sung Cho ),곽미숙 ( Mi Sook Gwak ),이숙영 ( Suk Young Lee ),함태수 ( Tae Soo Hahm ) 대한마취과학회 2007 Korean Journal of Anesthesiology Vol.52 No.5

Background: Simultaneous acupuncture to two or more acupoints has been used to improve acupuncture-induced effects in clinical practice. However, there is little evidence supporting the effects of simultaneous electroacupuncture (EA). This study examined whether simultaneous EA with 2 and 2 Hz or 2 and 100 Hz can produce synergic effects on ankle-sprained pain in rats. Methods: Ankle sprain pain was induced by manually overextending the lateral ligament of the right ankle in rats. Electrical stimulation with 2 Hz was delivered to the Yangno acupoint (SI6) and with 2 or 100 Hz to the Zusanli (ST36), either individually or simultaneously. The level of pain evoked by the ankle sprain was measured by the stepping force of the sprained paw during walking. The analgesic effects of simultaneous EA was evaluated by the percentage recovery of the stepping force at 1, 2 and 4hr after EA and compared to that of individual EA. Results: Individual EA significantly increased the stepping force of the ankle-sprained paw during walking, but there is no difference in the effect between electrical stimulation with 2 and 100 Hz EA. Simultaneous EA with 2 and 2 Hz or 2 and 100 Hz showed no significant improvement of the stepping force compared to individual EA. Conclusions: Individual EA with 2 and 100 Hz produced comparable analgesic effects. Simultaneous EA applied to the SI6 and ST36 acupoints produced no synergic interaction, therefore has no beneficial effect for ankle-sprained pain compared to individual EA. (Korean J Anesthesiol 2007; 52: 566~70)

유량 제어장치인 가변스로틀밸브의 기하학적 형상변화에 따른 공기역학 특성분석 연구

조현성(Hyun-Sung Cho),김철호(Chul-Ho Kim) 한국마린엔지니어링학회 2013 한국마린엔지니어링학회지 Vol.37 No.4