• Annual Conference of KIPS
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• 2019.10a
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• pp.827-829
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• 2019

본 논문에서는 최근 소개된 구글 TPU 보드를 사용하여 AI 알고리듬을 적용하고 성능 분석을 통하여 TPU 를 통한 AI 에 기반한 영상처리 시스템의 구현 가능성을 검증 하고자 하였다. 구글 TPU 보드는 기계 학습에 특화된 Coral Dev 보드를 사용하였고. 수행하는 인공지능 알고리즘은 객체 인식 알고리즘인 SSD 알고리즘을 사용하였다. 이 후 동일한 알고리즘을 GPU 가 장착되어 있는 고성능 데스크탑과 처리속도를 비교하여, TPU 에 기반한 임베디드 AI 시스템의 활용 가능성을 검증 하였다.

• Journal of the Korean Society of Food Science and Nutrition
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• v.20 no.5
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• pp.483-487
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• 1991

The utilization of ozone as a disinfectant for removing poultry meat microorganisms and then cleaning the poultry rinse water was investigated. When microbial suspensions were treated with ozone at 2, 500ppm/min for 40min, microorganisms were not detectable perfectly. The bacteriocidal effect of ozone by temperature was enhanced greater at 7$^{\circ}C$ than $25^{\circ}C$. All poultry meat microorganisms were killed by ozone treatment at 1, 530ppm for 50min. The pathogenic bacteria such as Salmonella sp. were more vulnerable and not detected by ozone treatment for 20min. Ozonation of the suspension for 20min and 50min increased light transmission at 500nm to 58% and 145%, respectively. The order of COD removal was ozone treatment(21%), coagulant((Al)2SO4) treatment(41%), ozone treatment after coagulant treatment(54%).

• Annual Conference of KIPS
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• 2012.11a
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• pp.79-82
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• 2012

본 논문에서는 퀄컴의 Vuforia 엔진을 이용한 증강현실 미로 찾기 어플리케이션을 제안하고 구현하였다. Vuforia 엔진은 증강 현실 엔진 중 비교적 최근에 만들어져 다양한 마커를 활용할 수 있으며 속도, 마커 인식 면에서 다른 AR 엔진에 비해 뛰어나다. 본 논문에서는 Vuforia 엔진에 기반한 미로 찾기 앱을 설계하고 구현한다. 제안한 방법에서는 스마트폰으로 이미지 마커를 인식한 후, 스마트폰 화면에 3D 캐릭터와 미로를 출력해주도록 한다. 또한 가속도 센서를 이용하여 사용자가 직접 스마트폰을 기울여 캐릭터를 목적지까지 이동시키는 미로 찾기 게임 어플리케이션을 구현하였다.

• Annual Conference of KIPS
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• 2013.11a
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• pp.986-988
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• 2013

본 논문에서는 GCM(Google Cloud Messaging) 서비스를 활용한 영단어 암기용 스마트폰 어플리케이션을 개발하였다. 서버에 있는 영단어 데이터베이스에서 스마트폰으로 영단어를 주기적으로 출력하여 사용자가 영단어에 자연스럽게 노출될 수 있는 어플리케이션을 개발하였다. 추가적으로 잠금 화면을 영단어와 뜻을 매칭 시켜 해제시키는 시스템을 구축함으로써 영단어를 더욱 더 효과적으로 암기할 수 있는 환경을 제공한다. 현재 안드로이드 마켓에서 제공되고 있는 영단어 암기 어플리케이션과 달리 개발한 어플리케이션은 한 번 설정 후 직접 실행할 필요가 없도록 한다.

• Korean Journal of Microbiology
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• v.46 no.3
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• pp.233-239
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• 2010

Four genes (yqfR, yfmL, ydbR, deaD) were identified as putative DEAD-box RNA helicase genes in the genomic sequence of Bacillus subtilis by homology search. To understand the function of these genes, each of the genes was deleted and the constructed strains were tested for their growth charateristics at different temperatures. The growth rate of ydbR deletion mutant ($T_d$=53 min) was a little bit reduced at $37^{\circ}C$ as compared to that of wild type strain (CU1065). But the growth rate of other three (yqfR, yfmL, deaD) deletion mutants ($T_d$=30-40 min) is nearly equal to the growth rate of wild type ($T_d$=32 min). On the other hands, the growth rate of deletion mutants were reduced at $22^{\circ}C$ in order of yqfR ($T_d$=151 min), yfmL ($T_d$=214 min), ydbR ($T_d$=343 min), which showed cold-sensitive phenotype. The deletion mutant of deaD ($T_d$=109 min) grew equally as compared to the growth rate ($T_d$=102 min) of the wild type at $22^{\circ}C$ and did not show cold-sensitive growth. Double, triple and quadruple deletion mutants of these genes were constructed, and growth rate of these mutants were measured at various temperature conditions ($22^{\circ}C$, $37^{\circ}C$, $42^{\circ}C$) using LB broth. Multiple deletion mutations showed more severe cold-sensitive growth than single deletion mutations, and double deletion of ydbR and yfmL ($T_d$=984 min) showed most cold-sensitive growth than any other double mutants. Such a cold-sensitive growth of these mutations is quite similar to the result of csdA or srmB deletion in E. coli and suggested that physiological role of ydbR and yfmL is related with ribosome assembly.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2016.10a
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• pp.539-540
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• 2016

• The Korean Journal of Physiology
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• v.15 no.1
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• pp.53-59
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• 1981

In the present study, an effort was directed to elucidate the effect of osmolality on the absorption of ethanol in rabbits. A single dose of 13.67 ml(2. 16 gm ethanol/kg BW) of hypo-, iso-hyphen and hypertonic ethanol per kg BW was administered into the stomach to albino rabbits and the experiment was performed at 30 th, 60 th and 120 th minute. The blood ethanol level was determined by the method of Williams et al, and hematocrit(Hct) was determined by the conventional Hct centrifuge and reader. The results are summarized as follow. The blood ethanol level showed the highest value at 60 min after the ethanol ingestion in the hypo- and isotonic groups, $171.3{\pm}13.3\;mg%$ and $204.5{\pm}23.0\;mg%$, respectively, but in the hypertonic group, the highest value was observed at 120min after the ingestion. The absorption rate of ethanol between 0 to 30 min after the ingestion of hypo- and isotonic ethanol was $88.54{\pm}12.04$ and $94.73{\pm}8.33\;mg/min$, respectively, but a decreased value of $44.72{\pm}6.69\;mg/min$ was noted after hypertonic ethanol ingestion comparing with hypo- and isotonic groups, The Hct value after hypo- and isotonic ethanol ingestion was decreased at 30 min but returned to the control level at 120 min. In contrast with hypo- and isotonic ethanol ingestion, hypertonic ethanol ingestion produced an increase of the Hct value at 30 min and returned to the control level at 120 min. The heart rate was increased but the respiratory rate was decreased after ethanol ingestion regardless of the osmolality.

• Journal of Environmental Science International
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• v.23 no.2
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• pp.157-164
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• 2014

The essential oil obtained by steam distillation from medicinal plants of Cinnamomum cassia and Prunellae Herba. Analysis of essential oils were performed on GC/MS selective detector. Separations were performed fused silica capillary column. The carrier gas was ultra pure helium with a flow of 1 $m{\ell}/min$ and the splitless injector temperature was set as $280^{\circ}C$. The column temperature program was as follows: initial temperature of $70^{\circ}C$ for 4 min, and increased by $2^{\circ}C/min$ 70 to $100^{\circ}C$ (held 2 min), After that the temperature was varied from 100 to $200^{\circ}C$ at $5^{\circ}C/min$ (held 20 min), increase to $280^{\circ}C$ (held 5 min) at $10^{\circ}C/min$, in a total run time of 73 min. Ten volatile flavor components were identified from C. cassia and ten volatile flavor components were identified from Prunellae Herba. Strong inhibition of growth of Vibrio parahaemolyticus was obtained with all doses of C. cassia tested. Moreover, antimicrobial activity of C. cassia occurred in a dose dependant manner.

• Toxicological Research
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• v.11 no.1
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• pp.161-168
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• 1995

It has been found that various stress challenges induce the myocardial antioxidant enzymes and produce an acquisition of the cellular resistance to the ischemic injury in animal hearts. Most of the stresses, however, seem to be guite dangerous to an animal's life. In the present study, therefore, we tried to search for safely applicable stress modalities which could lead to the induction of antioxidant enzymes and the production of myocardial tolerance to the ischemia-reperfusion injury. Male Sprague-Dawley rats (200-250 g) were exposed to various non-fatal stress conditions, i.e., hyperthermia (environmental temperature of $42^{\circ}C$ for 30 min, non-anesthetized animal), iramobilization (60 min), treadmill exercise (20 m/min, 30min), swimming (30 min), and hyperbaric oxyflenation (3 atm, 60 min), once a day for 5 days. The activities of myocardial antioxidant enzymes and the ischemia-reperfusion injury of isolated hearts were evaluated at 24 hr after the last application of the stresses. The activities of antioxidant enzymes, superoxide dismutase (SOD), catalase, glutathione peroxidase, glutathione reductase and glucose-6-phosphate dehydrogenase (G6PD), were assayed in the freshly excised ventricular tissues. The ischemia-reperfusion injury was produced by 20 min-global ischemia followed by 30 min-reperfusion using a Langendorff perfusion system. In swimming and hyperbaric oxygenation groups, the activities of SOD and G6PD increased significantly and in the hyperthermia group, the catalase activity was elevated by 63% compared to the control. The percentile recoveries of cardiac function at 30 min of the post-ischemic reperfusion were 55.4%, 73.4%, and 74.2% in swimming, the hyperbaric oxygenation and the hyperthermia groups, respectively. The values were significantly higher than that of the control (38.6%). In additions, left ventricular end-diastolic pressure and lactate dehydrogenase release were significantly reduced in the stress groups. The results suggest that the antioxidant enzymes in the heart could be induced by the apparently safe in vivo-stresses and this may be involved in the myocardial protection from the ischemia-reperfusion injury.

• Journal of Plant Biotechnology
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• v.31 no.4
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• pp.307-312
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• 2004

The bioreactor system for the large-scale plant tissue culture was developed to control the pH concentration and DO (dissolved oxygen), and air flowrate. The system controlling the proper air flow rate for each bulblet growth stage and monitoring the contamination of bioreactor using the pH change was controled by computer program. For the uniform bulblet distribution in bioreactor, the proper air flow rate was 300 cc/min at the beginning of bulblet culture, 400 cc/min after 20 days, 500 cc/min after 40 days, 600 cc/min after 60days, and 700 cc/min after 80 days. It was possible to maintain the pH concentration within 5.5$\pm$0.5 during the culture by control system of bioreactor.