Pub Date : 2020-01-01DOI: 10.13067/JKIECS.2020.15.1.139
Hyang-Joon Yoo, Jun-Seo Kim, Ji-A Baek, Y. Ko, Seung-Su Mok
The disadvantage of the general robot cleaner is that it works only on the designated route, so it is impossible to clean the place outside the designated route. Therefore, in this study, the direction control methodology for searching the place other than the designated route based on the finger recognition technology was studied to compensate for the shortcomings of the existing cleaner. Raspberry Pi was used as the main controller and Open CV program was used to recognize the number of fingers. To verify the validity of the proposed methodology, a finger recognition algorithm was implemented using Python language, and as a result of adopting the Logitech C922, the success rate was 100% at 90cm and 70% at 110cm, respectively. 키워드 Finger Recognition, Raspberry Pi, Robot Cleaner, Open CV 손가락 인식, 라즈베리 파이, 로봇 청소기, Open CV * 남서울대학교 전자공학과(halocolor16@naver.com,dbdlwm11@naver. com,Ktotd@naver.com,gksrnr8875@naver.com) ** 교신저자 : 남서울대학교 전자공학과 ᆞ접 수 일 : 2019. 11. 04 ᆞ수정완료일 : 2019. 12. 25 ᆞ게재확정일 : 2020. 02. 15 ᆞReceived : Nov. 04, 2019, Revised : Dec. 25, 2019, Accepted : Feb. 15, 2020 ᆞCorresponding Author : Yun-Seok Ko Dept. of Electronic Engineering, Namseoul University, Email : ysko@nsu.ac.kr I. 서 론 사물을 직접적으로 접촉하지 않고 통제 할 수 있다 면 인류의 삶은 더 편리해 질 수 있을 것이다. 인류는 이 문제에 대한 해결방법으로서 자동화를 고안하였고 이것의 실현을 위해 많은 노력을 기울여 왔다. 특히, 최근 핵가족화 및 맞벌이 부부의 증가로 가사에 투입 할 시간이 줄어들면서 가사노동시간을 최소화할 수 Regular paper Journal of the KIECS. pp. 139-146, vol. 15, no. 1, Feb. 29. 2020, t. 99, pISSN 1975-8170 | eISSN 2288-2189 http://dx.doi.org/10.13067/JKIECS.2020.15.1.139 JKIECS, vol. 15, no. 01, 139-146, 2020 140 있는 가사노동 자동화에 큰 관심이 집중되고 있다. 가사 노동 중 청소는 주변 환경을 깨끗하고 쾌적하 게 해주는 작업으로서 가정뿐만 아니라 기업, 공공장 소 모든 공간에서 필요한 작업이다[1]. 초창기 청소는 사람이 직접적으로 해왔기 때문에 상당한 노동력이 요구되어 자동화에 대한 수요가 점차 증가하였다. 그 리고 청소기에 대한 수요증가와 함께 핵심기술이 개 발됨으로서 로봇 청소기가 개발, 보급되어 가사노동을 크게 줄일 수 있었다. 하지만 기본적으로 로봇 청소기 는 청소 패턴이 고정 되어 있다는 단점을 가진다[2]. 예를 들어서 로봇청소기는 장소를 지나가고 그 자리 로 돌아가기까지는 시간이 걸린다. 즉, 지나간 자리를 더럽히면 다시 청소해야 하는데 청소기에는 패턴이 저장되어 있기 때문에 그 자리로 다시 돌아가려면 상 당한 시간이 소비된다. 그렇기 때문에 그 더럽혀진 장 소는 사람이 치워야 하거나 로봇 청소기가 돌아오기 전까지 기다려야 한다는 단점을 가진다. 최근, 모션 인식기술은 일부 분야에 적용되어 성공적으로 사용되 고 있다. 전자분야에서는 스마트폰에 손동작을 이용해 원거리에서 사진을 찍는 기능, 음악시장에서는 동작 제어 카메라(motion control camera)가 가수의 움직임 을 인식해 가수를 따라가거나 그 포즈에 맞게 움직이 도록 하는 기능에 적용되어 사용되고 있다[3]. 특히, 4 차 산업 혁명시대를 맞이하여 모션 제어 기술의 일환 인 손가락 인식기술에 대한 관심이 점차 증대되고 있 다[4-5]. 손가락 인식 기술은 사물의 동작을 프로세서 가 인식한 후 명령을 주어 오브젝트를 제어 할 수 있 는 기술로서 보다 직접적이고 디테일한 제어가 가능 하다는 장점 때문에 다양한 분야에서 적용이 기대되 며 동시에 기존 청소기의 고정된 공간 추적의 문제점 을 보완할 수 있는 기술이다[6]. 따라서 본 연구에서는 기존 청소기의 단점을 보완 하기 위해 손가락 인식 기술을 기반으로 정해진 루트 이외의 장소를 탐색하기 위한 방향제어 방법론을 연 구한다. 라즈베리파이를 주제어장치로 하여 손가락 인 식 알고리즘을 적용하고 카메라가 결합된 로봇 청소 기에, 손가락을 인식할 수 있도록 설정한 후 로봇 청 소기의 모터를 제어함으로서 로봇 청소기의 방향을 제어할 수 있도록 구현한다. 그리고 손가락 인식 알고 리즘이 장착된 로봇 청소기를 실험용으로 제작하여 제안된 방법론의 유효성을 검증한다. 로봇 청소기의 실험, 제작 시 케이스 제작은 현실적으로 쉽지 않기 때문에 기존 청소기의 케이스를 이용한다.
{"title":"Control Technology Based on the Finger Recognition of Robot Cleaners","authors":"Hyang-Joon Yoo, Jun-Seo Kim, Ji-A Baek, Y. Ko, Seung-Su Mok","doi":"10.13067/JKIECS.2020.15.1.139","DOIUrl":"https://doi.org/10.13067/JKIECS.2020.15.1.139","url":null,"abstract":"The disadvantage of the general robot cleaner is that it works only on the designated route, so it is impossible to clean the place outside the designated route. Therefore, in this study, the direction control methodology for searching the place other than the designated route based on the finger recognition technology was studied to compensate for the shortcomings of the existing cleaner. Raspberry Pi was used as the main controller and Open CV program was used to recognize the number of fingers. To verify the validity of the proposed methodology, a finger recognition algorithm was implemented using Python language, and as a result of adopting the Logitech C922, the success rate was 100% at 90cm and 70% at 110cm, respectively. 키워드 Finger Recognition, Raspberry Pi, Robot Cleaner, Open CV 손가락 인식, 라즈베리 파이, 로봇 청소기, Open CV * 남서울대학교 전자공학과(halocolor16@naver.com,dbdlwm11@naver. com,Ktotd@naver.com,gksrnr8875@naver.com) ** 교신저자 : 남서울대학교 전자공학과 ᆞ접 수 일 : 2019. 11. 04 ᆞ수정완료일 : 2019. 12. 25 ᆞ게재확정일 : 2020. 02. 15 ᆞReceived : Nov. 04, 2019, Revised : Dec. 25, 2019, Accepted : Feb. 15, 2020 ᆞCorresponding Author : Yun-Seok Ko Dept. of Electronic Engineering, Namseoul University, Email : ysko@nsu.ac.kr I. 서 론 사물을 직접적으로 접촉하지 않고 통제 할 수 있다 면 인류의 삶은 더 편리해 질 수 있을 것이다. 인류는 이 문제에 대한 해결방법으로서 자동화를 고안하였고 이것의 실현을 위해 많은 노력을 기울여 왔다. 특히, 최근 핵가족화 및 맞벌이 부부의 증가로 가사에 투입 할 시간이 줄어들면서 가사노동시간을 최소화할 수 Regular paper Journal of the KIECS. pp. 139-146, vol. 15, no. 1, Feb. 29. 2020, t. 99, pISSN 1975-8170 | eISSN 2288-2189 http://dx.doi.org/10.13067/JKIECS.2020.15.1.139 JKIECS, vol. 15, no. 01, 139-146, 2020 140 있는 가사노동 자동화에 큰 관심이 집중되고 있다. 가사 노동 중 청소는 주변 환경을 깨끗하고 쾌적하 게 해주는 작업으로서 가정뿐만 아니라 기업, 공공장 소 모든 공간에서 필요한 작업이다[1]. 초창기 청소는 사람이 직접적으로 해왔기 때문에 상당한 노동력이 요구되어 자동화에 대한 수요가 점차 증가하였다. 그 리고 청소기에 대한 수요증가와 함께 핵심기술이 개 발됨으로서 로봇 청소기가 개발, 보급되어 가사노동을 크게 줄일 수 있었다. 하지만 기본적으로 로봇 청소기 는 청소 패턴이 고정 되어 있다는 단점을 가진다[2]. 예를 들어서 로봇청소기는 장소를 지나가고 그 자리 로 돌아가기까지는 시간이 걸린다. 즉, 지나간 자리를 더럽히면 다시 청소해야 하는데 청소기에는 패턴이 저장되어 있기 때문에 그 자리로 다시 돌아가려면 상 당한 시간이 소비된다. 그렇기 때문에 그 더럽혀진 장 소는 사람이 치워야 하거나 로봇 청소기가 돌아오기 전까지 기다려야 한다는 단점을 가진다. 최근, 모션 인식기술은 일부 분야에 적용되어 성공적으로 사용되 고 있다. 전자분야에서는 스마트폰에 손동작을 이용해 원거리에서 사진을 찍는 기능, 음악시장에서는 동작 제어 카메라(motion control camera)가 가수의 움직임 을 인식해 가수를 따라가거나 그 포즈에 맞게 움직이 도록 하는 기능에 적용되어 사용되고 있다[3]. 특히, 4 차 산업 혁명시대를 맞이하여 모션 제어 기술의 일환 인 손가락 인식기술에 대한 관심이 점차 증대되고 있 다[4-5]. 손가락 인식 기술은 사물의 동작을 프로세서 가 인식한 후 명령을 주어 오브젝트를 제어 할 수 있 는 기술로서 보다 직접적이고 디테일한 제어가 가능 하다는 장점 때문에 다양한 분야에서 적용이 기대되 며 동시에 기존 청소기의 고정된 공간 추적의 문제점 을 보완할 수 있는 기술이다[6]. 따라서 본 연구에서는 기존 청소기의 단점을 보완 하기 위해 손가락 인식 기술을 기반으로 정해진 루트 이외의 장소를 탐색하기 위한 방향제어 방법론을 연 구한다. 라즈베리파이를 주제어장치로 하여 손가락 인 식 알고리즘을 적용하고 카메라가 결합된 로봇 청소 기에, 손가락을 인식할 수 있도록 설정한 후 로봇 청 소기의 모터를 제어함으로서 로봇 청소기의 방향을 제어할 수 있도록 구현한다. 그리고 손가락 인식 알고 리즘이 장착된 로봇 청소기를 실험용으로 제작하여 제안된 방법론의 유효성을 검증한다. 로봇 청소기의 실험, 제작 시 케이스 제작은 현실적으로 쉽지 않기 때문에 기존 청소기의 케이스를 이용한다.","PeriodicalId":22843,"journal":{"name":"The Journal of the Korea institute of electronic communication sciences","volume":"14 1","pages":"139-146"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74921804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.13067/JKIECS.2020.15.5.865
K. Chung
{"title":"Improved BER Performance of Non-Orthogonal Multiple Access System for Interactive Mobile Users: Maximum Likelihood Detection Perspective","authors":"K. Chung","doi":"10.13067/JKIECS.2020.15.5.865","DOIUrl":"https://doi.org/10.13067/JKIECS.2020.15.5.865","url":null,"abstract":"","PeriodicalId":22843,"journal":{"name":"The Journal of the Korea institute of electronic communication sciences","volume":"50 1","pages":"865-872"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84869179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.13067/JKIECS.2020.15.4.659
Lee In Joon, Sangin Kim
In this paper, we propose a silicon-based electro-optic (EO) modulator which can modulate a sign of a topological charge number l of |l|=1 orbital angular momentum (OAM) mode. The proposed EO modulator consists of position-dependent doped Si waveguide core and undoped SiO2, cladding, which enables control of the effective index and propagation loss of two OAM constitutive eigenmodes. The modulator functions as OAM mode maintaining waveguide at – 0.33V and as topological charge sign inverter at 10V. The output OAM mode purity is calculated through electric field distribution, showing high purity of |l|>0.92 in both cases.
{"title":"Silicon Electro-optic Orbital Angular Momentum Sign Modulator for Photonic Integrated Circuit","authors":"Lee In Joon, Sangin Kim","doi":"10.13067/JKIECS.2020.15.4.659","DOIUrl":"https://doi.org/10.13067/JKIECS.2020.15.4.659","url":null,"abstract":"In this paper, we propose a silicon-based electro-optic (EO) modulator which can modulate a sign of a topological charge number l of |l|=1 orbital angular momentum (OAM) mode. The proposed EO modulator consists of position-dependent doped Si waveguide core and undoped SiO2, cladding, which enables control of the effective index and propagation loss of two OAM constitutive eigenmodes. The modulator functions as OAM mode maintaining waveguide at – 0.33V and as topological charge sign inverter at 10V. The output OAM mode purity is calculated through electric field distribution, showing high purity of |l|>0.92 in both cases.","PeriodicalId":22843,"journal":{"name":"The Journal of the Korea institute of electronic communication sciences","volume":"4 1","pages":"659-664"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85099504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.13067/JKIECS.2020.15.4.717
I. Aliyu, C. Lim
Due to the important role played by emotion in human interaction, affective computing is dedicated in trying to understand and regulate emotion through human-aware artificial intelligence. By understanding, emotion mental diseases such as depression, autism, attention deficit hyperactivity disorder, and game addiction will be better managed as they are all associated with emotion. Various studies for emotion recognition have been conducted to solve these problems. In applying machine learning for the emotion recognition, the efforts to reduce the complexity of the algorithm and improve the accuracy are required. In this paper, we investigate emotion Electroencephalogram (EEG) feature reduction and classification using Stack AutoEncoder (SAE) and Long-Short-Term-Memory/Recurrent Neural Networks (LSTM/RNN) classification respectively. The proposed method reduced the complexity of the model and significantly enhance the performance of the classifiers.
{"title":"EEG Dimensional Reduction with Stack AutoEncoder for Emotional Recognition using LSTM/RNN","authors":"I. Aliyu, C. Lim","doi":"10.13067/JKIECS.2020.15.4.717","DOIUrl":"https://doi.org/10.13067/JKIECS.2020.15.4.717","url":null,"abstract":"Due to the important role played by emotion in human interaction, affective computing is dedicated in trying to understand and regulate emotion through human-aware artificial intelligence. By understanding, emotion mental diseases such as depression, autism, attention deficit hyperactivity disorder, and game addiction will be better managed as they are all associated with emotion. Various studies for emotion recognition have been conducted to solve these problems. In applying machine learning for the emotion recognition, the efforts to reduce the complexity of the algorithm and improve the accuracy are required. In this paper, we investigate emotion Electroencephalogram (EEG) feature reduction and classification using Stack AutoEncoder (SAE) and Long-Short-Term-Memory/Recurrent Neural Networks (LSTM/RNN) classification respectively. The proposed method reduced the complexity of the model and significantly enhance the performance of the classifiers.","PeriodicalId":22843,"journal":{"name":"The Journal of the Korea institute of electronic communication sciences","volume":"61 1","pages":"717-724"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84243488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.13067/JKIECS.2020.15.1.39
K. E. Soo
BaTiO3 thin films was deposited on the slide glass by RF sputter We have investigated the optical properties of BaTiO3 film after corona poling process The transmission characteristics was very good over 80% in visible region and second order nonlinear optical coefficient depends on the poling conditions The nonlinear optical coefficient of poled BaTiO3 films was about 1 15pm/V The relaxation of second order nonlinear optical was remained around 60% of the initial value for a long time In addition we have observed the green light generation from BaTiO3 films
{"title":"Green Generation and investigation of Optical Properties of Amorphous BaTiO3 by Poling","authors":"K. E. Soo","doi":"10.13067/JKIECS.2020.15.1.39","DOIUrl":"https://doi.org/10.13067/JKIECS.2020.15.1.39","url":null,"abstract":"BaTiO3 thin films was deposited on the slide glass by RF sputter We have investigated the optical properties of BaTiO3 film after corona poling process The transmission characteristics was very good over 80% in visible region and second order nonlinear optical coefficient depends on the poling conditions The nonlinear optical coefficient of poled BaTiO3 films was about 1 15pm/V The relaxation of second order nonlinear optical was remained around 60% of the initial value for a long time In addition we have observed the green light generation from BaTiO3 films","PeriodicalId":22843,"journal":{"name":"The Journal of the Korea institute of electronic communication sciences","volume":"59 1","pages":"39-44"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89410488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.13067/JKIECS.2020.15.3.405
Yu Cha, Young-Guen Jang, Boo-il Kim
{"title":"Design of Simple Direct Comparison Measurement System from 10 MHz to 1 GHz for Thermistor Mounts Calibration","authors":"Yu Cha, Young-Guen Jang, Boo-il Kim","doi":"10.13067/JKIECS.2020.15.3.405","DOIUrl":"https://doi.org/10.13067/JKIECS.2020.15.3.405","url":null,"abstract":"","PeriodicalId":22843,"journal":{"name":"The Journal of the Korea institute of electronic communication sciences","volume":"22 1","pages":"405-412"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81657517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.13067/JKIECS.2020.15.5.835
Dong-Woo Kim, Soon‐Soo Oh
{"title":"Verification on the Reduction Technique of Measurement Time of Total Radiated Power (TRP) by Using Effective Isotropic Radiated Power (EIRP) in 5G Frequency Band","authors":"Dong-Woo Kim, Soon‐Soo Oh","doi":"10.13067/JKIECS.2020.15.5.835","DOIUrl":"https://doi.org/10.13067/JKIECS.2020.15.5.835","url":null,"abstract":"","PeriodicalId":22843,"journal":{"name":"The Journal of the Korea institute of electronic communication sciences","volume":"53 1","pages":"835-840"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76626415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.13067/JKIECS.2020.15.2.307
On Kim, Seong-Jin Choi
{"title":"Intelligent Motor Control System Based on CIP","authors":"On Kim, Seong-Jin Choi","doi":"10.13067/JKIECS.2020.15.2.307","DOIUrl":"https://doi.org/10.13067/JKIECS.2020.15.2.307","url":null,"abstract":"","PeriodicalId":22843,"journal":{"name":"The Journal of the Korea institute of electronic communication sciences","volume":"15 1","pages":"307-312"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72658185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.13067/JKIECS.2020.15.4.665
C. Park, Young-Kil Jun
Buffer layer in CIGS thin-film solar cells improves energy conversion efficiency through band alignment between the absorption layer and the window layer. ZnS is a non-toxic II-VI compound semiconductor with direct-transition band gaps and n-conductivity as well as with excellent lattice matching for CIGS absorbent layers. In this study, the structural and optical properties of ZnS thin films, deposited by RF magnetron sputtering method and subsequently performed by the rapid thermal annealing treatment, were investigated for the buffer layer. The zincblende cubic structures along (111), (220), and (311) were shown in all specimens. The rapid thermal annealed specimens at the relatively low temperatures were polycrystalline structure with the wurtzite hexagonal structures along (002). Rapid thermal annealing at high temperatures changed the polycrystalline structure to the single crystal of the zincblende cubic structures. Through the chemical analysis, the zincblende cubic structure was obtained in the specimen with the ratio of Zn/S near stoichiometry. ZnS thin film showed the shifted absorption edge towards the lower wavelength as annealing temperature increased, and the mean optical transmittance in the visible light range increased to 80.40% under 500°C conditions.
{"title":"Structural and Optical Properties of ZnS Thin Films Fabricated by Using RF Sputtering and Rapid Thermal Annealing Process for Buffer Layer in Thin Film Solar Cells","authors":"C. Park, Young-Kil Jun","doi":"10.13067/JKIECS.2020.15.4.665","DOIUrl":"https://doi.org/10.13067/JKIECS.2020.15.4.665","url":null,"abstract":"Buffer layer in CIGS thin-film solar cells improves energy conversion efficiency through band alignment between the absorption layer and the window layer. ZnS is a non-toxic II-VI compound semiconductor with direct-transition band gaps and n-conductivity as well as with excellent lattice matching for CIGS absorbent layers. In this study, the structural and optical properties of ZnS thin films, deposited by RF magnetron sputtering method and subsequently performed by the rapid thermal annealing treatment, were investigated for the buffer layer. The zincblende cubic structures along (111), (220), and (311) were shown in all specimens. The rapid thermal annealed specimens at the relatively low temperatures were polycrystalline structure with the wurtzite hexagonal structures along (002). Rapid thermal annealing at high temperatures changed the polycrystalline structure to the single crystal of the zincblende cubic structures. Through the chemical analysis, the zincblende cubic structure was obtained in the specimen with the ratio of Zn/S near stoichiometry. ZnS thin film showed the shifted absorption edge towards the lower wavelength as annealing temperature increased, and the mean optical transmittance in the visible light range increased to 80.40% under 500°C conditions.","PeriodicalId":22843,"journal":{"name":"The Journal of the Korea institute of electronic communication sciences","volume":"72 1","pages":"665-670"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75928607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.13067/JKIECS.2020.15.3.527
Yu-Ra Jung, Y. Jang
{"title":"Analysis of EEG Reproducibility for Personal Authentication","authors":"Yu-Ra Jung, Y. Jang","doi":"10.13067/JKIECS.2020.15.3.527","DOIUrl":"https://doi.org/10.13067/JKIECS.2020.15.3.527","url":null,"abstract":"","PeriodicalId":22843,"journal":{"name":"The Journal of the Korea institute of electronic communication sciences","volume":"16 1","pages":"527-532"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76127317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：