• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.295-296
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• 2023

본 논문에서는 웹 크롤링을 통한 개인 맞춤형 정보제공 애플리케이션에 관해 연구하였다. 본 서비스는 Java의 Jsoup 라이브러리를 이용해서 웹 크롤링(Web Crawling)한 데이터를 MySQL에 저장한다. 이를 통해 사용자가 지정한 키워드를 필터링하여 사용자에게 정보를 제공한다. 예를 들어 사용자가 지정한 키워드 관련 공지 사항이 업데이트되면 구현한 앱 내에서 확인 가능하며, KakaoTalk 알림톡을 통해서도 업데이트된 정보를 실시간으로 전송받는 서비스를 구현하였다.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.42 no.1
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• pp.1-7
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• 2005

We propose an effective Landsat TM image compression method using the classified bidirectional prediction (CBP), the classified KLT and the SPIHT. The SPIHT is used to exploit the spatial redundancy of feature bands selected in the visible range and the infrared range separately. Regions of the prediction bands are classified into three classes in the wavelet domain, and then the CBP is performed to exploit the spectral redundancy. Residual bands that consist of difference values between the original band and the predicted band are decorrelated by the spectral KLT Finally, the three dimensional (3-D) SPIHT is used to encode the decorrelated coefficients. Experiment results show that the proposed method reconstructs higher quality Landsat TM image than conventional methods at the same bit rate.

• Journal of Korean Society of Forest Science
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• v.101 no.2
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• pp.305-308
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• 2012

The box tree pyralid, Glyphodes perspectalis, was reared on an artificial diet based on dried powder of box tree leaves, Buxus microphylla var. koreana, and INSECTA F-II (Nihon Nosan Co., Ltd) at a ratio of 3:7 (w:w) and analyzed in their developmental characteristics from $1^{st}$ to $4^{th}$ generation. The developmental period of larva reared on artificial diet was longer than that of larva reared on host plant. Significant difference in larval period was also observed between $1^{st}$ and other generation groups. Pupation rate was the highest in $4^{th}$ generation followed by $3^{rd}$, $2^{nd}$, $1^{st}$ and host plant group. Significant difference in pupal period was noted between $1^{st}$ and 3rd generation group. Emergence rate was the highest in $4^{th}$ generation group followed by $3^{rd}$, host plant, $1^{st}$ and $2^{nd}$ generation group. There is a significant difference in male and female size between $1^{st}$ and $4^{th}$ generation group. Our result indicated that stable rearing of box tree pyralid through the year is possible by artificial diet, and the best adaptation to artificial diet was achieved at $4^{th}$ generation.

• Korean Journal of Animal Reproduction
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• v.26 no.2
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• pp.111-117
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• 2002

This study was carried out to investigate the effects of frozen boar semen on reproductive performance in swine artificial insemination (AI). Many factors, which were breeds, time of insemination, sperm concentration per dose, farm and year were investigated to improve reproductive performance efficiency. Boars were raised at Swine Artificial Insemination Center in National Livestock Research Institute, Sunghwan, Chungnam, Korea. This experiment was carried out from 1995 to 2000. There were no differences in swine AI with frozen boar semen using 5$m\ell$ maxi-straw among 3 breeds (Landrace, Yorkshire, Duroc), 2 or 3 times insemination per estrus, and 3 different sperm numbers of 3.0, 4.0, and 5.0$\times$10$^{9}$ per dose of insemination. However, non-return rate and litter size of sows inseminated with frozen boar semen of commercial farms were different according to farm management system and inseminator's skill. Conception rate, farrowing rate and number of pigs born alive per litter by artificial insemination with frozen boar semen (5$m\ell$ maxi-straw) from 1995 to 1999 was 68.3~74.6%, 61.7~67.6% and 8.1~8.7 heads.

• The KIPS Transactions:PartA
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• v.18A no.6
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• pp.271-280
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• 2011

Time-Triggered Architecture (TTA), one of real-time software design paradigms which executes tasks in timely manner, has long been advocated as being better suited in fore-sighting system behavior than event-triggered architecture (ETA). To gain this valuable feature of TTA, however, precise task designing process is mandatory. Alternatively, ETA tries to execute tasks whenever paired events are occurred. It provides intuitive and flexible basement to add/remove tasks and, moreover, better response time performance. However ETA is difficult to analyze because system behavior might be different depending on the order of interrupts detected by the system. Many previous researches recommended TTA when developing safety-critical real-time systems, but cost problem of task designing process and insufficient consensus for applying rigorous software engineering practice are still challenging in practice. This paper describes software refactoring process which applying TTA approach into ETA based embedded software in artificial heart system. We implemented dedicated interrupt monitoring program to capture existing tasks' real-time characteristics. Based on the captured information, proper task designing process is done. Real-time analysis using RMA (Rate-Monotonic Analysis) verified that new design guarantees timeliness of the system. Empirical experiments revealed that revised design is as efficient, when measured in terms of system's external output, as the old design and enhances predictability of the system behavior as well.

• Proceedings of the KSMRM Conference
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• 2001.11a
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• pp.25-34
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• 2001

복부의 자기공명영상(Magnetic resonance imaging； MRI)은 주로 간 질환의 검사에서 다른 영상검사로 해결되지 않은 궁금점을 풀기 위한 보조적인 검사로 주로 사용하였으나, 최근 들어서는 병변의 발견 및 감별진단에 직접적인 검사로도 자주 이용하고 있으며, 담췌관 질환이나 위장관 검사 등에도 적용범위가 넓어지고 있다. 이는 그간의 하드웨어 및 소프트웨어상의 발달로 인해, 위장관 연동운동이나 호흡에 따른 인공물을 억제하면서도 해부학적인 세부구조는 자세하게 나타낼 수 있는 우수한 영상을 얻을 수 있음으로써 가능하게 되었다. 고속영상은 영상의 질을 우수하게 할 뿐 아니라, 검사시간을 단축시켜서 더 많은 환자를 검사할 수 있게 하고, 한자가 검사에 더 잘 적응할 수 있게 하여준다. 단발(single-shot)기법의 고속 T2강조영상은 담췌관이나 위장관등 그간 MRI를 적용하기 어려웠던 부위에 대한 검사가 가능하게 하였으며, 고속의 3차원 T1강조 펄스대열(pulse sequence)은 단면에 따른 오기록(misregistration)이나 운동인공물이 적으면서도, 향상된 다평면적인 영상구성을 얻을 수 있게 하였다. ［l］. 본 강좌에서는 최근 수년간 복부 MRI의 응용을 증가할 수 있게 한 영상장치 및 펄스대열의 발전과 최근 국내에 시판이 허용되어 사용이 증가되고 있는 새로운 간자기공명조영제에 관해서 살펴보고자 한다.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2002.12a
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• pp.463-467
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• 2002

In this paper, we construct the fault detection and diagnosis system based on fuzzy algorithm in the injection molding machine. Data of operating injection molding machine are acquired in database in order to raise the reliability of detection and diagnosis.

• Proceedings of the Korea Water Resources Association Conference
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• 2020.06a
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• pp.286-286
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• 2020

인공함양은 대수층함양관리 중 하나의 기법이며 하수처리장 방류수의 영향을 직·간접적으로 받은 물을 지하대수층에 함양하여 수질의 향상을 기대할 수 있다. 그러나 방류수의 영향으로 인해 다수의 미량유해물질들이 대수층으로 유입됨에 따라 함양 후 회수할 때 이들의 검출이 빈번해졌다. 이에 따라 이 미량유해물질의 제거를 위해 인공함양의 후속 공정으로 나노막 여과를 고려하여 인공함양과 나노막 공정을 통하여 미량유해물질의 거동을 파악하고자 하였다. 본 연구에서는 인공함양 지하저수지 모사 컬럼을 설계하여 실험하였다. 서울특별시 탄천 하류에서 샘플링한 물을 원수로 사용하였으며 인공함양에 앞서 염소, 과망간산염, 오존의 3종류 산화 전처리를 통하여 그 영향을 확인하고자 하였다. 함양기간은 2.5일이었으며 함양 후 나노막 장치를 통하여 최종 유출수를 획득하였다. 인공함양 결과 용존유기물은 45%~63% 수준에서 제거가 되어 인공함양시 용존유기물의 제거가 가능함을 확인하였다. 산화 전처리에 따른 동화가능유기탄소의 증가로 인하여 생분해가 주요 기작인 인공함양 처리를 통하여 동화가능유기탄소의 제거율이 유기용존탄소의 제거율에 직접적으로 영향을 주었음을 알 수 있었다. 미량유해물질로 알려진 과불화화합물의 경우 산화 전처리에 따른 제거는 관찰되지 않았으며 잔류의약물질의 경우 대상 물질의 물리·화학적 특성에 따라 산화시 제거가 가능함을 확인하였다. Iopromide와 같은 조영제의 경우 오존 산화를 통하여 98% 이상 제거되어 산화를 통한 제거가 가능함을 확인하였다. 인공함양시 과불화화합물은 분자량이 큰 PFNA, PFDA, PFOS 등이 제거되었으며 그 제거율은 각각 최대 >99%까지 도달하였다. 분자량이 작은 과불화화합물의 경우 인공함양을 통과하는 경향을 보였다. 잔류의약물질의 경우 생분해가 용이한 물질은 제거가 됨을 확인하였으며 carbamazepine 등 제거가 안 되는 물질은 제거율이 18% 미만으로 확인하였다. 나노막 여과 결과 과불화화합물이 최대 >99%까지 제거됨을 확인하였으며 미량유해물질의 경우에도 대부분의 물질이 제거됨을 확인하였다.

• Korean Journal of Environment and Ecology
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• v.6 no.1
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• pp.1-8
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• 1992

Artificial acid rain (pH 3.0, 4.0 and 5.0) was treated on the seeded pots of 4 species to examine its effects on germination, leaf injury and seedling growth. Artificial acid rain was prepared by diluting sulfuric acid with ground water and ground water (pH 6.5) was used as control. Artificial acid rain was sprayed to seeded pots three times per week. About 5mm of artificial acid rain was treated each time from early April to early October, 1991. Germination, seedling establishment, leaf injury, soil acidity and seedling growth were measured and compared among the treatments. The results were summarized as follows; 1. Germination and seedling establishment rate of Pinus thunbergiana was highest on the pH 4.0 pot whereas that of Picea abies was highest on the pH 3.0 pot. Those of Pinus densiflora and Abies holophylla were not significantly differed among the treatments. 2. The differences in seedling height of all species were not significantly differed among the treatments. 3. Seedling dry weight of Pinus densiflora differed significantly among the treatments. but that of Pinus thunbergiana did not differ. 4. With decrease of pH value of artificial acid rain. the number of injured needle and injured individual tended to be increased. 5. The differences of soil acidity were significant among the treatments for all species.

• KIPS Transactions on Software and Data Engineering
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• v.10 no.7
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• pp.279-286
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• 2021

Recently, We are carrying out a policy of physical distancing of at least 1m from each other to prevent the spreading of COVID-19 disease in public places. In this paper, we propose a method for measuring distances between people in real time and an automation system that recognizes objects that are within 1 meter of each other from stereo images acquired by drones or CCTVs according to the estimated distance. A problem with existing methods used to estimate distances between multiple objects is that they do not obtain three-dimensional information of objects using only one CCTV. his is because three-dimensional information is necessary to measure distances between people when they are right next to each other or overlap in two dimensional image. Furthermore, they use only the Bounding Box information to obtain the exact coordinates of human existence. Therefore, in this paper, to obtain the exact two-dimensional coordinate value in which a person exists, we extract a person's key point to detect the location, convert it to a three-dimensional coordinate value using Stereo Vision and Camera Calibration, and estimate the Euclidean distance between people. As a result of performing an experiment for estimating the accuracy of 3D coordinates and the distance between objects (persons), the average error within 0.098m was shown in the estimation of the distance between multiple people within 1m.