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A Study on the Observation Days of Maritime Traffic Investigation
Sang-Lok Yoo,Seong-Book Park,Young-Soo Park,Jae-Yong Jeong 해양환경.안전학회 2015 海洋環境安全學會誌 Vol.21 No.4
본 연구는 관측일수에 따른 교통량의 신뢰성을 검증하고자 한다. 목포항의 1년간 선박자동식별장치(AIS) 자료를 사용하여 월별, 요일별, 시간별 변화지수를 비교한 후, 각 관측일수에 따른 최대표준오차를 산출하였다. 월별변화지수를 비교한 결과 9월달 1.11, 2월달 0.84로 나타나 9월달이 2월달 교통량 보다 약 32.1 % 많은 것으로 나타났다. 요일변화지수는 화요일 1.05, 일요일 0.92로 나타나 화요일이 일요일 교통량보다 약 14.1 % 많았다. 해상교통조사는 요일변화지수를 고려하여 최소 1주일 이상 실시하면 최대표준오차를 21 % 이내로 산출할 수 있다. 따라서 해상교통조사 관측시기에 따라 각 변화지수를 적용하여 교통량의 흐름을 반영한 연구가 뒷받침 되어야 하겠다. This study is to compare variation indexes by monthly, weekly and hourly using AIS data, which was collected for 365 days from January 1st to December 31st, 2013 at Mokpo Port and then, computed the maximum standard error by observation days. The comparison of monthly variation indexes showed that the monthly variation indexes for September and February were 1.11 and 0.84, respectively, in turn revealing that the maritime traffic in September was about 32.1 % larger than February. Also, the daily variation indexes for Tuesday and Sunday were 1.05 and 0.92, respectively, in turn revealing that the maritime traffic in Tuesday was about 14.1 % larger than Sunday. When the maritime traffic investigation is executed for at least 1 week in consideration of the daily variation index, it is possible to reduce the maximum standard error rate to be within 21 %. Therefore, if the maritime traffic investigation is made in the month and week with low maritime traffic, each variation index should be applied to reflect the actual maritime traffic.
Mobile에서 1.0㎜ × 0.5㎜ size Light Emitting Diode를 이용한 User Interface Display 방법
박북성(Book-Sung Park),이선구(Seon-Gu Lee),손성일(Sung-il Son),정보현(Bo-Hyun Jung),권성훈(Sung-Hun Kwon),김철주(Chul-Ju Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
The goal of this paper is to propose a method of user interface display using 1.0㎜ × 0.5㎜ size Light Emitting Diode on mobile phone. We have developed the 1005 size LED and new package of I²c control Ie. Firstly, we explain display method using l.0㎜ × 0.5㎜ size LED. Secondly, We propose to the new package of 40pin Thin-QFN(6.0㎜ × 6.0㎜) control IC. As a result, the proposed display method is shown good accuracy at dark room and a long range, furthermore the display technique method is improved for character recognition and real-time display.
2차원 평면상에서 주파수 추출을 위한 2-축 가속도 센서 Simulation
박북성(Book-Sung Park),이선구(Seon-Gu Lee),손성일(Sung-il Son),곽칠성(Chil-Seong Kwak),김철주(Chul-Ju Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
This paper is on the modeling of two-axis accelerometer and extraction of their frequency characteristics which is applied surface micro machining for measuring the frequency at two-dimensional plane. In this paper, MEMS which is a field of two-axis accelerometer semiconductor sensors using surface micro machining technology is applied. The proposed accelerometer basic structure is based on the comb driver and movable mass at the two-dimensional plane. The Two-axis accelerometer is adopted as an auto focus system operation of digital camera and application component are implemented by using gyroscope of aviation systems.
AlInGaN Cell structure를 이용한 Light Emitting Diode 설계 및 제작
박북성(Book-Sung Park),이선구(Seon-Gu Lee),홍근기(Kuen-Kee Hong),정인성(In-Sung Jung),손성일(Sung-il Son),김철주(Chul-Ju Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
The goal of this paper is design and fabrication of 1.0㎜ × 0.5㎜ size blue color light emitting diode. The proposed 1.0㎜ × 0.5㎜ size LED basic structure is based on the AlInGaN cell structure. We explain and propose to 1.0㎜ × 0.5㎜ size new package LED and fabrication. Firstly, we explain the 220㎛ × 220㎛ cell structure using AlinGaN. Secondly, we propose fabrication procedure of 1.0㎜ × 0.5㎜ size LED. Finally, we shown the characteristics of fabricated smaller size LED.
P-Channel and N-Channel Switching FET와 Capacitor를 이용한 ORFS Switching Spectrum error correction 방법
박북성(Book-Sung Park),이선구(Seon-Gu Lee),정인성(In-Sung Jung),권성훈(Sung-Hun Kwon),손성일(Sung-il Son),김철주(Chul-Ju Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
The goal of this paper is to propose a method of ORFS switching spectrum error correction using P-Channel and N-Channel Switching FET and Capacitor on GSM PCMCIA Card Type. We have developed the GSM PCMCIA card also including 2.2mF load capacitor and dual FET package IC. Firstly, we explain Output RF Spectrum of GSM system effect on the modulation, wide band noise and switching transient. Secondly, we propose the schematic for improvement on ORFS for GSM system. To sum up, the proposed schematic was improvement 10㏈ switching spectrum margin and reduce the noise level approximately 290㎷.
집광기를 이용한 Photovoltaic Power System의 효율 개선에 관한 연구
정인성(In-Sung Jung),박북성(Book-Sung Park),홍근기(Kun-Ki Hong),김일호(Il-Ho Kim),김철주(Chul-Ju Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
The goal of this paper is to propose a study on efficiency improvement of photovoltaic power system using condensing plate. We measured characteristic of current and voltage for proposed solar cell using commercially sold of aluminum and sliver glass on flat concentrator The increase ration of power are 64% respectively when used of three sides concentrator. According to our experimental test results the propose the solar cell system was improvement increase the efficiency also increased power electric of photovoltaic. To sum up, the proposed solar cell system have advantage for photovoltaic power system Also, I expect that our test results will be applied photovoltaic power house system.
( Myong Il Bae ),( Sung Hyuk Moon ),( Taein Kim ),( Book Young Kang ),( Jong Min Park ),( Sang Jun Lee ),( Nac Kin Kim ),( Min Kyung Shin ) 대한피부과학회 2013 대한피부과학회 학술발표대회집 Vol.65 No.2
Background: Various methods have been used to improve transdermal drug delivery, still but penetration through the stratum corneum limits effectiveness. Objectives: The purpose of this study was to investigate in vitro skin delivery and in vivo protoporphyrin IX accumulation of topically applied 5-aminolevulinic acid(ALA), and assess the degree of enhancement by fractional radiofrequency(RF) pretreatment and sonophoresis post-treatment. Methods: Three male domestic swine were used, and the skin of pig was exposed to fractional RF alone, followed by topical 5-ALA application with and without sonophoresis. Fluorescence intensities were measured for porphyrin fluorescence. Results: Fluorescence intensities of porphyrin ware increased after pretreatment with fractional RF and after sonophoresis post-treatment in the epidermis and dermis. Conclusion: We confirmed that pre-fractional RF and post-treatment with sonophoresis increased transdermal drug penetration.
홍근기(Kuen-Kee Hong),박북성(Book-Sung Park),정인성(In-Sung Jung),김일호(Il-Ho Kim),황호중(Ho-Jung Hwang),김철주(Chul-Ju Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
That TV Broadcast be flowed Digitalization, If it is became Digitalization, Field be happened very problem, Now document, Digital Block of complex Europe TV Broadcast be techniqued for development of Software Processes. C-Language changed before software composited of assembly, that It’s tried system of simple, define and software became very stable. Before as Analog Circuit composited, Europe TV development changed digital circuit, add function part of software processes insufficiency, for assembly, bug happening of software program work, information processes ability of very quality, solved the same software modify difficulty part. Agreeably, for now document improved, digital block composite of complex europe TV broadcast processed better stable video module development.