• Journal of Bio-Environment Control
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• v.1 no.1
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• pp.37-51
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• 1992

Quantizing and extracting visual features of mushroom(Lentinus edodes L.) are crucial to the sorting and grading automation, the growth state measurement, and the dried performance indexing. A computer image processing system was utilized for the extraction and measurement of visual features of front and back sides of the mushroom. The image processing system is composed of the IBM PC compatible 386DK, ITEX PCVISION Plus frame grabber, B/W CCD camera, VGA color graphic monitor, and image output RGB monitor. In this paper, an automatic thresholding algorithm was developed to yield the segmented binary image representing skin states of the front and back sides. An eight directional Freeman's chain coding was modified to solve the edge disconnectivity by gradually expanding the mask size of 3$\times$3 to 9$\times$9. A real scaled geometric quantity of the object was directly extracted from the 8-directional chain element. The external shape of the mushroom was analyzed and converted to the quantitative feature patterns. Efficient algorithms for the extraction of the selected feature patterns and the recognition of the front and back side were developed. The developed algorithms were coded in a menu driven way using MS_C language Ver.6.0, PC VISION PLUS library fuctions, and VGA graphic functions.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.25 no.2
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• pp.264-274
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• 2001

An integrated fatigue strength assessment system was computerized. The system developed consists of 9 modules: user interface, cycle counting, load history construction, data searching, fatigue properties estimation, fatigue data analysis, true stress and strain analysis, expert system for crack initiation life prediction, fatigue crack initiation and propagation life prediction. Fatigue strength database also was included in this system. The fatigue expert system helps a beginner to predict a fatigue crack initiation life in fatigue strength assessment. The expert system module in this system is developed on the personal computer by using C language and UNiK, an expert system developing tool. To evaluate the system, the results of test under variable loading of SAE and failure data from a field were analyzed. The evaluation show that the system provided fatigue life prediction within 3-scatter band and gave reasonable predictions. To get more accurate predictions of fatigue life without fatigue properties, we recommend utilizing the system along with the fatigue strength database.

• Annual Conference of KIPS
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• 2001.04b
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• pp.611-614
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• 2001

최근 인터넷 사용의 폭발적인 증가로 인하여 웹 상에서 유기적으로 통합된 멀티미디어 컨텐츠에 대한 서비스 제공의 필요성이 대두되었다. 이에 1998년 W3C(World Wide Web Consortium)는 통합 멀티미디어 표현 언어인 SMIL(Synchronized Multimedia Integration Language)을 발표하였고, SMIL-Boston으로 진행했던 SMIL 1.0 확장 프로젝트를 SVG(Scalable Vector Graphics)의 애니메이션 기능의 도입 및 기능 확장으로 2000년 9월 SMIL 2.0으로 최종 Working Draft안을 발표하게 되었다. 이에 본 논문에서는 SMIL컨텐츠 저작을 위한 자동 생성 모듈 및 전용 저작 도구를 제공하고, SMIL 컨텐츠 데이터베이스 서버 및 재생기와의 통합으로 원활한 SMIL 컨텐츠 서비스 환경을 제공하는 웹 멀티미디어 컨텐츠 서비스를 위한 서버/클라이언트 통합 시스템을 설계 및 구현하였다.

• Annual Conference of KIPS
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• 2000.10a
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• pp.55-58
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• 2000

컴퓨터의 사용이 보편화되고, 정보화 사회로 발전해감에 따라 이 기종간의 문서 정보 교환 및 인터넷과 네트웍 인프라의 향상으로 인한 문서 처리량은 계속 증대되고 있다. 또한 문서의 표현 방법 및 문서량의 증대로 인해 사용자의 요구는 다양해져가고 있다. 기존의 웹(Web)에서 사용되고 있는 HTML(Hyper-Text Markup Language)은 고정된 태그를 사용해서, 사용자가 직접 논리적인 구조를 갖는 문서를 작성할 수 가 없었다. 이에 W3C에서는 XML을 발표하여, 사용자가 논리 구조를 가진 문서를 작성할 수 있도록 하였다. 이러한 XML 문서의 논리적인 구조를 표현하려면, XML 문서 안에 어떤 것을 담을 수 있는지에 대한 규칙들의 집합인 스키마(Schema)가 필요하다. 현재 여러 종류의 스키마가 사용되고 있으며, 이를 이용한 다양한 문서들이 사용되고 있다. 본 논문에서는 현재 가장 많이 사용되고 있는 스키마인 DTD를 보다 쉽게 작성할 수 있는 자바 기반의 스키마 편집기를 설계 및 구현하였다.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.55 no.9
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• pp.376-383
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• 2006

In this paper, autonomous information exchange methodology is studied between IEDs using SOAP protocol based on XML and PtP communication to archive the safety and reliability of large-scale system operation. The SOAP protocol has the advantages in the independency Problem for operating systems, using language, platforms and the security problem because it is XML-based RPC protocol. Inference-based solution of the IED is designed as rule-based solution so that the IED internal status, the system status or the faulted zone can be inferred autonomously using the internal data as well as information data obtained from free information exchange among other IEDS, Also, it is designed so that the inference results and the operation information are transmitted to the above SCADA system, and determined autonomously whether the commands from the SCADA are executed or not. Finally, The inference-based solution of IED and information exchange system among IEDS is implemented using MS Visual C++ MFC, MS SOAP and MS XML. Availability and accuracy of the proposed methodology and the design is verified from diversity simulation reviews for typical distribution substation.

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.51 no.10
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• pp.468-476
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• 2002

Digital images are easily corrupted by noise during the data transmission, data capture and data processing. A technical method of noise analyzing and adaptive filtering for reducing of quantum noise in medical radio-fluoroscopy images is presented. By adjusting the characteristics of the filter according to local statistics around each pixel of the image as moving windowing, it is possible to suppress noise sufficiently while preserve edge and other significant information required in diagnosis. We proposed adaptive weighed median(AWM) filters based on local statistics. We showed two ways of realizing the AWM filters. One is a simple type of AWM filter, which is constructed by Homogeneous factor(HF). Homogeneous factor(HF) from the noise models that enables the filter to recognize the local structures of the image is introduced, and an algorithm for determining the HF fitted to the diagnostic systems with various inner statistical properties is proposed. We show by the experimented that the performances of proposed method is superior to these of other filters and models in preserving small details and suppressing the noise at homogeneous region. The proposed algorithms were implemented by Visual C++ language on a IBM-PC Pentium 550 for testing purposes and the effects and results of the filter in the various levels of noise and images were proposed by comparing the values of NMSE(normalized mean square error) with the value of the other existing filtering methods.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10a
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• pp.98-100
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• 2000

현대 사회는 웹이라는 것을 통하여 수많은 정보들을 얻을 수 있으며 시간과 공간을 초월하고 있다. 이러한 정보들 가운데 이미지, 동영상, 오디오, 텍스트 등을 실시간으로 동시에 제공받는 것은 아직도 웹 상에서는 한계가 있다. 이러한 한계를 극복하기 위해 W3C(World Wide Web Consortium)에서 XML 어플리케이션의 하나로서 SMIL (Synchronized Multimedia Integration Language)이란 표준화한 방안과 기술을 개발하였고, 이러한 표준화된 SMIL을 바탕으로 기존의 디지털 T.V, VOD, 웹 상에서의 멀티미디어 프리젠테이션 등과 같은 분야와 연계하고자 하는 연구가 활발히 진행되고 있다. 그러나, 리얼시스템사의 G2나 애플사의 QuickTime과 같은 SMIL을 지원하는 상용 플레이어들을 비롯한 기존의 다양한 SMIL 플레이어에는 SMIL 문서를 검색할 수 있는 해결책을 제시하지 못하고 있다. 현재와 같으 기하급수적인 웹의 발전은 기본적인 웹의 기능 외에 웹에 대한 다양한 검색 기능이 제공되면서부터 이며 웹의 이러한 발전 과정을 미뤄볼 때 SMIL 또한 이러한 검색 기능의 제공은 필수적이라 할 수 있다. 그러므로, 본 논문에서는 기존의 SMIL 플레이어들이 지원하지 못했던 검색 기능을 지원하기 위해 SMIL에서 의미를 가지는 엘리먼트와 컨텐트를 가지고 인덱스를 구축하고, 또한 이를 이용하여 산재해 있는 SMIL 문서와 문서내의 미디어 객체 등에 대한 검색을 수행한 후 선별적으로 디스플레이할 수 있게 하는 검색 기능을 갖는 SMIL 플레이어를 설계 및 구현한다.

• Speech Sciences
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• v.5 no.2
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• pp.17-26
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• 1999

It has been claimed that Korean mid-vocalic voiceless unaspirated lax stops are phonetically realized with voicing throughout the oral closure phase. Acoustic measurements were undertaken to examine the claim with four Korean native speakers using /$V_1CV_2$/ words where the vowel ($V_1\;=\;V_2$) was /i, a, u/ and the C was voiceless unaspirated lax stops /p, t, k/. Findings: (1) During mid-vocalic stops /k/ and /p/ the vowel /u/ was accompanied generally by a significant increase in voice cessation time as percentage of the oral closure interval (PCT) than the vowel /a/, regardless of subjects, whereas in mid-vocalic alveolar stop /t/ the effects of vowels on PCT were subject-dependent, (2) The effects of vowels on PCT were significantly greater in mid-vocalic /k/ than /p/, regardless of subjects, (3) The mean PCT, averaged across six tokens, ranged from 17% to100%, giving overall mean 61% in which the standard deviation was ${\pm}30$, and (4) Overall % of the total of mid-vocalic unaspirated lax stops were produced with a substantial period of devocing and voicing lag. Considering these results, it is difficult to agree with the existing claims that Korean voiceless unaspirated lax stops are phonetically realized with voicing throughout the oral closure phase. Other phonetic variables, including the durations of pre/post-stop vowels, voice onset time, voice cessation time, and the duration of oral closure, were measured.

• Journal of Biosystems Engineering
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• v.21 no.2
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• pp.123-133
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• 1996

An automatic drum seeder was developed to improve the seeding operation. It consisted of a conveyor to transfer seedling trays, a seed-hopper to supply seeds, a drum to drop seeds on the tray, and an air blower to remove extra seeds. A photo sensor was used to detect the transfer of seedling trays, and its signal was fed into microcomputer which operated a stepping motor driving the drum. The seeds were adhered to the surface of drum by vacuum pressure, and were dropped into tray cells by compressed air. An air connection unit was devised to alternate between vacuum pressure and compressed air. A control program for the system, written in C language, could operate the drum at the given number of revolutions and revolutions per minute. The results showed that the air connection unit could operate well and the seeds were dropped satisfactorily into tray cells. In case of cabbage and perilla seeds, which are regular and spherical shape, the missing rate was low and the single seeding rate was more than 97%. Low missing rate and high multiple seeding rate were observed in lettuce seeds which have narrow ends with tight weight. The missing rate of pepper seed was very high because of heavy weight and irregular shape. To improve the performance of the seeder, adjustment of vacuum pressure based upon shape and weight of the seeds, careful selection of the material of drum, maintenance of consistent air blower pressure, and replacement of stepping motor to DC motor are recommended.

• Journal of Sensor Science and Technology
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• v.21 no.1
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• pp.46-52
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• 2012

The rapid water pollution in stream, river, lake and sea in recent years raises an urgent need for continuous monitoring and policymaking to conserve the global clean environment. In particular, the increasing water pollution in coastal marine areas adds to the importance of the environmental monitoring systems. In this paper, the mobile server is designed to gathers information of the water quality at coastal areas. The obtained data by the server is transmitted from field servers to the base station via multi-hop communication in wireless sensor network. The information collected includes dissolved oxygen(DO), hydrogen ion exponent(pH), temperature, etc. By the information provided the real-time monitoring of water quality at the coastal marine area. In addition, wireless sensor network-based flooding routing protocol was designed and used to transfer the measured water quality information efficiently. Telosb sensor node is programmed using nesC language in TinyOS platform for small scale wireless sensor network monitoring from a remote server.