• 드라이브 ㆍ 컨트롤
• /
• 제16권4호
• /
• pp.23-31
• /
• 2019

The purpose of this study was to evaluate the PTO severeness for an agricultural tractor during disk plow and rotary tillage. The PTO load measurement system was constructed with data acquisition and a PTO torquemeter. Field experiments were conducted at a combination of traveling speed (L3 Low, L3 High) and PTO speed (P1, P2). The load spectrum was generated using the rain-flow counting method, and the SWT method was used to consider the range and mean of the PTO load. The damage sum was calculated by applying a modified miner rule, which is a cumulative damage law. The relative severeness was expressed as the ratio of the lowest damage sum. Relative severeness was higher with the lower PTO gear stage, and higher driving gear stage and it was approximately 40-102 times higher for rotary tillage than disk plow tillage in the same gear stages. The relative severeness was 1010.12 in the rotary tillage under L3 High P1 based on the disk plow tillage under L3 Low P2.

• 전기전자학회논문지
• /
• 제23권4호
• /
• pp.1328-1336
• /
• 2019

안전하고 최적의 배터리 성능을 유지하기 위해 정확한 충전상태(SOC) 추정 기술이 필수적이다. 본 논문에서는 기존의 전류적산 방법이 가지고 있는 문제를 해결하기 위해 시간 종속성을 가지는 인공지능 기반의 LSTM을 이용한 SOC 추정 방법을 적용하였다. 훈련과 검증에 필요한 데이터는 전기적 실험을 통해 일정 크기로 방전된 전류, 전압, 온도를 수집하였고 학습을 위한 입력데이터의 질을 향상시키기 위해 데이터 전처리를 수행하였다. 또한, LSTM 모델의 구조 및 하이퍼파라미터 설정에 따른 학습 능력과 SOC 추정 성능을 비교하였다. 학습한 모델은 UDDS 프로파일을 통해 검증하였으며, RMSE 0.82%, MAX 2.54%의 추정 정확도를 달성하였다.

• 대한의생명과학회지
• /
• 제24권1호
• /
• pp.30-34
• /
• 2018

Silver (Ag) has been widely used in commercial products and medical fields since ancient times because of its antibacterial effect. It is harmless and non-toxic to the human body. For this reason, recent research has actively evaluated antimicrobial activity using silver (Ag). In this study, we investigated the inhibitory effect of a silver-based compound, silver phosphate ($Ag_3PO_4$) on the growth of Staphylococcus aureus and the activation of human immunity. First, the inhibitory effect of $Ag_3PO_4$ on the growth of Staphylococcus aureus was confirmed by a growth curve and a colonyounting method. As a result, the growth inhibitory effect increased as the concentration of $Ag_3PO_4$ increased. Specifically, treatment with $5{\mu}g/mL$ of $Ag_3PO_4$ resulted in no bacteria growth, and the colony-counting method showed a remarkable inhibition. In addition, the expression of cytokine IL-8 by $Ag_3PO_4$ was examined to investigate the cellular immune system activation by $Ag_3PO_4$. After pretreatment of Staphylococcus aureus for 1 hour with $50{\mu}g/mL$ $Ag_3PO_4$, an increased IL-8 mRNA expression resulted. In cells treated with $Ag_3PO_4$, we found that the expression of IL-8 was enhanced in a time-dependent fashion compared to non-treated cells. These results indicate that $Ag_3PO_4$ induces antimicrobial activity against Staphylococcus aureus and activates human immunity. These results are expected to contribute to the future study of the mechanism of silver (Ag) and silver-based compounds in relation to antibacterial activity.

• 한국정밀공학회지
• /
• 제24권7호
• /
• pp.120-125
• /
• 2007

Analysis of elders' behavioral characteristic during showering provides important fundamental data when developing an automatic showering system. We recorded showering behavior of 37 elders' at the front, back, left and right view using four CCTV cameras. The photographic data were analyzed by counting the frequencies of body scrub and identifying zones where hands could reach. And we measured their body sizes, and conducted questionnaire of showering for 302 peoples. Analysis was done according to the analysis criteria established. The human body was divided into 14 zones from a body, and the numbers of body scrub for each zone were counted. The average total numbers of body scrub were 170.8 excluding the head, the face and the neck. The average numbers of body scrub with right hand were 70.2, left hand were 88.2, and both hands were 81.8. The percentages of body scrub frequencies were 16.3% (breast), 12.2%(crotch), 8.8% (abdomen), 7.5% (waist), 8.8% (shoulder), 7% (hips), 0.4% (back), 15.2% (arm), and 23.9% (leg). Elders scrubbed the breast, crotch and abdomen more frequently than the back and hips. According to the video analysis and questionnaire results, the distribution of shower heads (or nozzles) at the front side should be arranged at the ratio of 40% of the trunk(breast, shoulders, abdomen), 20% of the thighs, the calves, and the crotch, respectively. The distribution of shower heads (or nozzles) of the back side were arranged at the ratio of 20% of the waist and the arms, 20% of the back, the thighs, the calves, and the hip, respectively.

• Asian Pacific Journal of Cancer Prevention
• /
• 제15권4호
• /
• pp.1851-1857
• /
• 2014

Objective: The main purpose of this work was to investigate the effect of berberine hydrochloride (BH) on the proliferation, apoptosis, migration, and invasion of CNE-1 nasopharyngeal carcinoma cells. Our results shed light on the functional components of traditional Chinese herbs for potential use in modern medicine. Methods: The CNE-1 cell line was treated with different concentrations of BH and effects on cell viability and proliferation were evaluated using the Cell Counting Kit-8 (CCK-8) assay. Anti-migratory and anti-invasive actions of BH were investigated using wound healing assays and the Millicell Hanging cell culture insert system, respectively. Expression of the epithelial-mesenchymal transition (EMT)-related gene twist (Twist) was analyzed by real-time PCR and Western blotting. Apoptosis was estimated with an annexin-V fluorescein (FITC) apoptosis detection kit, as well as with reference to levels of activated caspase-3 of CNE-1 cells before and after treatment with BH utilizing fluorescence spectroscopy. Results: BH was capable of reducing proliferation and viability of CNE-1 cells in a dose- and time-dependent manner, also demonstrating anti-migratory and anti-invasive capacities which correlated with reduction in expression of Twist. Finally, BH was able to induce significant amounts of apoptosis in CNE-1 cells, as demonstrated by an increase in the activity of caspase-3 and in annexin-V staining following treatment. Conclusion: BH extracted from rhizoma coptidis demonstrated an ability to block proliferation, induce apoptosis, and impair the migration and invasion of the CNE-1 cell line Considering these properties, our results suggest that BH could be an important compound for consideration in the treatment of nasopharyngeal carcinoma.

• The Journal of the Acoustical Society of Korea
• /
• 제13권2E호
• /
• pp.26-31
• /
• 1994

화자인식을 위한 음성특징을 카오스의 어트랙터와 신경망를 이용해서 추출하는 방법을 제시한다. 기존의 음성신호 표현방법과 특징 추출법은 음성인식 시스템에서 별 무리가 없이 사용되었으나 2차원 표현에서 오는 한계는 아직까지 극복해야할 과제로 남아있다. 본 연구에서는 최근 각광받고있는 새로운 시그날표현기법인 카오스이론이 스트레인저 어트랙터를 이용하여 음성특징을 추출하는 화자인식시스템에 적용하고자 한다. 입력된 음성신호는 3차원 공간안에서 어트랙터라 불리우는 기하학적인 형태로 표현되는데 이 3차원 어트랙터를 이용하면 기존의 2차원적인 표현으로부터 얻는 특징보다 더 많은 정보를 추출할 수 있을 것이다. 특징추출 기법은 3가지를 제안하였고 각 기법으로 추출된 특징벡터는 신경회로망을 통해 학습되어 인식률을 실험하였다. 제시한 기법들에 따라 다르나 인식률은 약 82%부터 96%까지 나타났다.

• 한국환경복원기술학회지
• /
• 제16권1호
• /
• pp.131-145
• /
• 2013

The purposes of this research are : to analyze biotop type and carry out conservation value assessment in study areas, Daegu Science Park national industrial complex; to supply basic data for the landscape ecological planning; and to improve the application of assessment model with the development of Biotop Value Assessment Tool (B-VAT). The result is as follows. First of all, the field survey showed 434 species of flora and 220 species of insecta. According to the result of biotop type analysis in the biotop classification system with field survey, 13 biotope groups and 63 biotope types were classified. In the map of biotop type classification, readjusted farmland biotop(FA) was prevalent and forest biotop(E) was shown to the southeast side of the site. Next, according to the first assessment with B-VAT, total 19 biotop types including natural river(BA) with abundant plants had I grade and total 16 biotop types such as vegetable garden adjacent to river(BC) had V grade. In terms of the second assessment, we analyzed total 30 areas, total 82 areas, respectively, which had special meaning for the conservation of species and biotop(1a, 1b) and which had meaning for the conservation of species and biotop(2a, 2b, 2c). This research will be a basic data, which can solve the damage problem systematically and control it landscape-friendly with biotop classification and assessment which we developed. In particular, we expect that biotop value assessment tool(B-VAT) with GIS will be a great contribution to popularity compared with the value model by complicated algorism such as adding-matrix, weight and equal distribution. In addition, this will save the time and improve the accuracy for hand-counting.

• 과학기술학연구
• /
• 제13권1호
• /
• pp.181-216
• /
• 2013

본 논문에서는 일반적인 웹검색 기술에 대한 분석을 포함하여, 한글검색엔진에 대한 접근도 전개하고자 한다. 최근 검색엔진의 독점적 지위문제, 검색순위의 공정성 문제가 발생하면서 우려가 높아지고 있다. 검색엔진을 둘러싸고 발생하는 상이한 해석적 주장들에는 기술결정론적 관점에서부터 도구주의적 관점까지 다양하다. 여러 해석적 주장들은 강한 지향성을 가지고 있지만 또한 그럴만한 기원도 가지고 있다. 이처럼 다양한 해석이 병존하는 것은 이 기술에 대한 통합적 재해석이 제기되고 있다는 의미일 것이다. 검색엔진은 사용자의 관심을 흡수하여 자신의 질서를 부여하는 기술양식이다. 이는 검색엔진의 합리성으로부터 기원한다. 특히 한글검색엔진은 사용자들의 관심을 끌어들임으로서 자신의 합리성을 증식시켜왔다. 한글검색은 일반적인 검색엔진이 수행하는 문서들 사이의 관계만이 아니라, 사용자들이 입력하는 단어들 사이의 기호학적 관계를 양식화해냈고 그로써 강력한 권위를 구성해냈다. 이제 검색엔진의 판단은 단순한 안내자의 지위를 넘어서 민주주의의 문제가 되었다. 어떻게 검색엔진의 전문성을 승인하면서도 민주주의에 봉사하도록 할 것인가? 검색엔진과 인간행위자를 분절적으로 보는 대신에, 둘 사이의 관계방식에 초점을 둘 때 검색기술에 대한 새로운 전망을 내놓을 수 있을 것이다.

• Journal of Radiation Protection and Research
• /
• 제43권3호
• /
• pp.85-96
• /
• 2018

Background: A variety of inorganic scintillators have been developed and improved for use in radiation detection and measurement, and in situ gamma-ray spectrometry in the environment remains an important area in nuclear safety. In order to verify the feasibility of promising scintillators in an actual environment, a performance test is necessary to identify gamma-ray peaks and calculate the radioactivity from their net count rates in peaks. Materials and Methods: Among commercially available scintillators, $LaBr_3(Ce)$ scintillators have so far shown the highest energy resolution when detecting and identifying gamma-rays. However, the intrinsic background of this scintillator type affects efficient application to the environment with a relatively low count rate. An algorithm to subtract the intrinsic background was consequently developed, and the in situ calibration factor at 1 m above ground level was calculated from Monte Carlo simulation in order to determine the radioactivity from the measured net count rate. Results and Discussion: The radioactivity of six natural radionuclides in the environment was evaluated from in situ gamma-ray spectrometry using an $LaBr_3(Ce)$ detector. The results were then compared with those of a portable high purity Ge (HPGe) detector with in situ object counting system (ISOCS) software at the same sites. In addition, the radioactive cesium in the ground of Jeju Island, South Korea, was determined with the same assumption of the source distribution between measurements using two detectors. Conclusion: Good agreement between both detectors was achieved in the in situ gamma-ray spectrometry of natural as well as artificial radionuclides in the ground. This means that an $LaBr_3(Ce)$ detector can produce reliable and stable results of radioactivity in the ground from the measured energy spectrum of incident gamma-rays at 1 m above the ground.

• 대한화학회지
• /
• 제15권4호
• /
• pp.191-197
• /
• 1971

고 순도 팔라듐 금속(99.9%)에 함유된 루테늄 함량을 $^{104}Ru(n,{\gamma};{\beta}^-)^{105}Rh$의 핵반응에 의하여 생성된 $^{105}Rh$의 방사능을 계축하므로써 결정하였다. 원자로에서 조사된 팔라듐 시료와 루테늄 표준시료를 왕수 처리 및 과산화나트륨으로 용융시킨다음 $^{105}Rh$을 음이온 및 양이온 교환수지로 분리하였다. 팔라듐 시료로 부터 얻은 $^{105}Rh$의 방사능을 루테늄 표준시료로 부터 얻은 $^{105}Rh$의 방사능과 비교하므로서 루테늄의 함량을 결정하였다. 본 방법으로 구한 루테늄의 검출한계는 팔라듐 10mg을 시료로 하였을 때 약 1ppm이었으며 이 검출 감도는 $^{102}Ru(n,{\gamma})^{103}Ru$의 핵반응을 사용한 종래의 방사화 분석에 비해 약 40배 더 예민하였다.