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      • KCI등재

        Compensation of Sensor Gain Difference in Measuring Straightness Errors Using a Mixed Sequential Two-probe Method

        정지훈,Jeong Seok Oh,정성종 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.3

        We present a compensation method for the sensor gain difference when a mixed sequential two-probe method (MTPM) is applied for precision measurements of straightness error. According to theoretical analysis of the effect of sensor gain error, much of the measurement error comes from the sensor gain difference. Also, measurement error caused by misalignment of the straight-edge is dramatically amplified by the sensor gain difference. Therefore, the measurement error in MTPM can be significantly reduced by compensating for the sensor gain difference. To compensate for sensor gain difference, we propose a very simple approach that uses sensor outputs for two different alignment conditions of the straight-edge. To verify the proposed compensation method, experiments were performed with a hydrostatic linear motion table. Experimental results show that the gain difference of the two sensors used in the experiments was about 3.4%. Before compensation, the deviation in the calculated straightness error depending on the alignment conditions was 1.30 μm, which was reduced to 0.08 μm after compensation. The compensated measurement results were compared with results obtained by a reversal method. The maximum deviation between the two methods was 0.22 μm. These results demonstrate that the proposed compensation method is very effective for the measurement of straightness error with sub-micron accuracy and in addition it is practical because compensation can be performed on the actual measurement setup.

      • 조선후기 李國美의 주거공간설계도에 구현된 선⋅후천 합일 사상 : 「용도서」를 중심으로

        정지훈 한국방송통신대학교 통합인문학연구소 2012 통합인문학연구 Vol.4 No.1

        이 글은 조선후기 주거공간설계에 활용된 「용도서」를 분석한 글이다. 이국미가 설계한 「용도서」는 홍만선이 저술한 『산림경제』 「복거」 편에 실려 있다. 이국미는 박태보가 고안한 「용문정사도」를 보고 착상을 얻어 「용도서」를 새롭게 제작했는데, 박태보가 기존의 「하도」 10수를 그대로 본 떠 「용문정사도」를 제작한 반면, 이국미는 「하도」 10수에다 윤선거가 제시한 8괘를 결합하여 「용도서」를 설계했다. 「용도서」에 응용된 윤선거의 8괘 학설은 조선후기 역학 지형도에서 나타난 새로운 흐름을 단적으로 살펴볼 수 있는 대표적 예로서 선천역과 다른 후천역이라는 데서 주목할 만하다. 이국미가 주거공간설계도에서 윤선거의 8괘설을 수용한 것은 윤선거의 8괘 구조가 상징하는 선후천 합일의 사상을 지향했기 때문이라고 추론할 수 있다. 박태보와 이국미는 자신이 바라는 이상을 담은 하도와 팔괘를 자신이 살아가는 주거공간에 구현함으로써 정신적 지향과 주거공간의 구조를 연결시키고자 했다. 이와 같이 조선의 선비들이 형성해나 간 새로운 문화는 중국에서는 볼 수 없는 독특한 것으로 조선후기까지 그 명맥이 유지되었다. This article is the analysis of Yongdoseo(龍圖墅) of Lee gukmi that applied for the housing design. Yongdoseo(龍圖墅) was put on the Sanlimgeongje(山林經濟) that Hong Manseon(洪萬選) had written. Lee gukmi created a new hosing design by regenerating YongmunJeongsado(龍文精舍圖) of Park Taebo. Whereas Park Taebo designed it by imitating the Hado(河圖), Lee gukmi combined the Hado with a new Parlgae(八卦) that was originated by Yun Seongeo(尹宣擧). The reason of the conbinative design of Lee gukmi was the pursue of the thought of Seon-Hucheon Unity(先後天合一) in his own house.

      • SCIEKCI등재

        한국산유자(韓國産柚子)의 화학적성분(化學的成分)에 관(關)한 연구(硏究)

        정지훈,Jung, Ji-Heun 한국응용생명화학회 1974 Applied Biological Chemistry (Appl Biol Chem) Vol.17 No.1

        한국산유자(韓國産柚子)의 화학적성분(化學的成分)을 일반성분(一般成分)과 특수성분(特殊成分)으로 구분(區分)하여 일반성분(一般成分)이 관(關)하여는 시기별변화(時期別變化)를 특수성분(特殊成分)은 성숙기유자(成熟期柚子)에 관(關)하여 amino acid vitamin C, 유리당(遊離糖), 유기산(有機酸), 향성분(香成分)등을 분석(分析)하여 시기별성분(時期別成分) 변화(變化)가 식물생리(植物生理)에 미치는 영향(影響)과 식품(食品)의 효과적(效果的) 이용(利用)에 관(關)한 검토결과(檢討結果)는 다음과 같이 요약(要約)된다. 1. 과피(果皮)와 과육(果肉)의 시기별분석결과(時期別分析結果)는 과피율(果皮率)과 과육율(果肉率)를 비교(比較)할때 전자(前者)가 더 크며 지역적(地域的)으로 볼때는 과피율(果皮率)은 도서부(島嶼部)가 내륙지(內陸地)보다 더 크다. 2. 일반성분(一般成分)에 있어서 과피(果皮)에서는 3기(期)까지 수분함량(水分含豊)의 증가(增加)를 보이고 기후(其後) 일정상태(一定狀態)를 유지(維持)하며 조지방(粗脂肪), 섬유질(纖維質), 회분(灰分), 총산(總酸), 가용성무질소물(可溶性無蜜素物)등은 3기(基)까지 감소(減少)하며 환원당(還元糖)은 급증(急增)하고 섬유질(纖維質)과 총산(總酸)은 계속감소(繼續減少)를 보인다. 과육(果肉)에서는 3기(期)까지 수분(水分), 환원당(還元糖)이 증가(增加)하고 조지방(粗脂肪), 섬유질(纖維質), 회분(灰分), 조단백질(粗蛋白質), 가용성무질소물(可溶性無窒素物)등은 3기(期)까지 감소(減少)한다. 3 Vitamin C의 함량(含量)은 과육(果肉) 보다 과피(果皮)에 많고 일본산유자(日本産柚子) 보다 한국산유자(韓國産柚子)에 더 많었다. 4. 유리당(遊離糖)은 xylose, fructose, glucose, sucrose등 4종(種)이 분리검출(分離檢出)되었고 과육(果肉)보다 과피(果皮)에 더 많이함유(含有)되어 있었다. 5. 휘발성유기산(揮發性有機酸)의 함량(含量)은 과육(果肉)보다 과피(果皮)에 더 많고 과피(果皮)에 acetic acid, formic acid, n-valet acid등 3종(種)과 과육(果肉)에 formic acid, acetic acid, propionicacid 등 3종(種)이 분리(分離)되었다. 6. 비휘발성유기산(非揮發性有機酸)의 함량(含量)은 과피(果皮)보다 과육(果肉)에 더 많고 과피(果皮)에 citric acid, glutaric acid, malic acid tartaric acid, oxalic acid, malonic acid, succinic acid와 unknown 1종(種)등 8종(種)이 분리검출(分離檢出)되었고 과육(果肉)에서는 citric acid, malic acid, succinic acid, oxalic acid, glutaric acid, malonic acid등 6종(種)이 분리확인(分離確認)되있다. 7. 향성분(香成分)의 정유중성부(精油中性部)에서 D-limonene, ${\alpha}-pinone$, p-cymene의 3종(種)과 unknown 7종(種)등 10종(種)이 분리검색(分離檢索)되었고 함량(含量)으로 보아 D-limonene이 유자(柚子)의 주향성분(主香成分)인 것으로 생각된다. 8. 식품(食品)의 효율적이용(效率約利用)은 과피(果皮)와 과육(果肉)을 공(共)히 쓸수 있고 미숙과(未熟果)는 citric acid제조용(製造用), 성숙과(成熟果)는 과중제조원료(果汁製造原料)로 쓸수 있다는 것이 상기(上記) 연구결과(硏究結果)에의(依)하여 확인(確認)되었다. The chemical components of Citrus junos produced in Korea were divided into two parts; common and special components respectively. In the former the relation between the physiological effects of the plant and its ripening process was observed periodically while the latter was analyzed the ripening fruits for their effective utilization as food. The results are summarized as follows: 1. The analytical result of seasonal change showed that the rind ratio was higher than the flesh ratio and on a regional basis, the rind ratio was higher in the islands than on land areas. 2. In the experiment the moisture was increased until the third period, but afterwards it was made constant. While the content of crude fat, cellulose, ash, total acid and soluble non-nitrogen material were decreased until the third period and the cotent of cellulose and total acid were continuousely redused until the last period. In con trast with the above the content of reducing sugars was increased but the content of crude fat, cellulose, ash, crude protein and soluble non-nitrogen material were increased until last period. 3. The content of vitamin C was richer in the rind than in the flesh, in the Korean species than in the Japanese. 4. Free sugars; xylose, fructose, glucose were richer in the rind than in the flesh. 5. The content of volatile organic acids was richer in the rind than in the flesh. Among them, volatile acids, acetic acid, formic and n-valeric acid were found in the rind and formic acid, acetic acid and propionic acid were deteceed in the flesh. 6. The total content of non-volatile acids was richer in the flesh than in the rind. In the kind of non-volatile acids, citric acid,glutaric acid, malic acid, tartaric acid, oxalic acid, malonic acid, succinic acid and an unknown acid were found in the rind and citric acid, malic acid, succinic acid, oxalic acid, glutaric acid and malonic acid in the flesh. 7. Three kinds of aromatic components: D-limonene, ${\alpha}-pinene$, p-cymene and seven other kinds of unknown aromatic components were detected in neutral essential oils. Among them, D-limonene seemed to be main aromatic component in the fruits. 8. From the above results it is confirmed that both rind and flesh of the ripened fruit could be utilized for food effectively, and unripened fruits are suitable for producing citric acid, ripened fruits are also useful for producing juice.

      • KCI등재

        Comparison study of SARIMA and ARGO models for in uenza epidemics prediction

        정지훈,이상열 한국데이터정보과학회 2016 한국데이터정보과학회지 Vol.27 No.4

        The big data analysis has received much attention from the researchers working in various fields because the big data has a great potential in detecting or predicting future events such as epidemic outbreaks and changes in stock prices. Re ecting the current popularity of big data analysis, many authors have proposed methods tracking in uenza epidemics based on internet-based information. The recently proposed `autoregressive model using Google (ARGO) model' (Yang et al., 2015) is one of those in uenza tracking models that harness search queries from Google as well as the reports from the Centers for Disease Control (CDC), and appears to outperform the existing method such as `Google Flu Trends (GFT)'. Although the ARGO predicts well the outbreaks of in uenza, this study demonstrates that a classical seasonal autoregressive integrated moving average (SARIMA) model can outperform the ARGO. The SARIMA model incorporates more accurate seasonality of the past in uenza activities and takes less input variables into account. Our findings show that the SARIMA model is a functional tool for monitoring in uenza epidemics.

      • KCI등재

        빅데이터를 이용한 기후변화/지구온난화 관련 기상 현상 인식 분석

        정지훈,최영은,문자연,박미나 건국대학교 기후연구소 2019 기후연구 Vol.14 No.4

        This study had two main objectives. We first investigated which weather phenomena people were most concerned about in the context of climate change or global warming. Then, we conducted content analysis to find which words were more commonly used with climate change or global warming. For this, we collected web data from Twitter, Naver, and Daum from April to October 2019 in the Republic of Korea. The results suggested that people were more concerned about air quality, followed by typhoons and heat waves. Because this study only considered one warm period in the year of 2019, winter-related weather phenomena such as cold wave and snowfall were not well captured. From Twitter, we were able to find wider range of terminologies and thoughts/opinions than Naver and Daum. Also, more life-relevant weather events such as typhoons and heat waves in Twitter were commonly mentioned compared to Naver and Daum. On the other hand, the comments from Naver and Daum showed relatively narrower and limited terms and thoughts/ opinions. Especially, most of the comments were inf luenced by headlines of articles. We found many comments about air quality and energy/economic policy. We hope this paper could provide background information about how to promote the climate change education and public awareness and how to efficiently interact with general audiences.

      • KCI등재

        Miscanthus as a Potential Bioenergy Crop in East Asia

        정지훈,김도순 한국작물학회 2012 Journal of crop science and biotechnology Vol.15 No.2

        Miscanthus is a perennial rhizomatous grass with C4 photosynthesis and native to East Asia. This grass has been considered as a weed in East Asia, and never been considered as a bioenergy crop until the end of the 20th century. Meanwhile, it has been studied as a potential bioenergy crop in Europe since the 1980s. Soaring energy consumption and heavy dependency of its energy production on imported petroleum have led to initiate finding alternative energy in East Asia. Miscanthus has high water and nutrient-use efficiency,and cold tolerance, high biomass yield potential up to 40 t DM ha-1 with long sustainable productivity up to more than 15 years after the first establishment, and high carbon sequestration capacity. In this regard, Miscanthus is one of the most ideal bioenergy crops in East Asia; potential areas where sufficient size of land is available include Mongolia, the far eastern part of Russia such as Primorski-Krai, Amur Oblast, and Khabarovsk-Krai, and northern parts of China such as Jilin, Heilongjiang, and Neimenggu. Although low temperature and rainfall may be limiting factors, it is expected that Miscanthus can be cultivated for commercial biomass production in this region, particularly Primorski-Krai. To facilitate Miscanthus biomass production and its commercial use for biofuel production in East Asia, it is necessary to introduce a new Miscanthus variety with cold and drought tolerance, and to develop a Miscanthus plantation technology and production management system. Miscanthus is a perennial rhizomatous grass with C4 photosynthesis and native to East Asia. This grass has been considered as a weed in East Asia, and never been considered as a bioenergy crop until the end of the 20th century. Meanwhile, it has been studied as a potential bioenergy crop in Europe since the 1980s. Soaring energy consumption and heavy dependency of its energy production on imported petroleum have led to initiate finding alternative energy in East Asia. Miscanthus has high water and nutrient-use efficiency,and cold tolerance, high biomass yield potential up to 40 t DM ha-1 with long sustainable productivity up to more than 15 years after the first establishment, and high carbon sequestration capacity. In this regard, Miscanthus is one of the most ideal bioenergy crops in East Asia; potential areas where sufficient size of land is available include Mongolia, the far eastern part of Russia such as Primorski-Krai, Amur Oblast, and Khabarovsk-Krai, and northern parts of China such as Jilin, Heilongjiang, and Neimenggu. Although low temperature and rainfall may be limiting factors, it is expected that Miscanthus can be cultivated for commercial biomass production in this region, particularly Primorski-Krai. To facilitate Miscanthus biomass production and its commercial use for biofuel production in East Asia, it is necessary to introduce a new Miscanthus variety with cold and drought tolerance, and to develop a Miscanthus plantation technology and production management system.

      • KCI등재

        Laparoscopic Distal Gastrectomy for Gastric Cancer in Morbidly Obese Patients in South Korea

        정지훈,류성엽,정미란,박영규,정오 대한위암학회 2014 Journal of gastric cancer Vol.14 No.3

        Purpose: Laparoscopic gastrectomy in obese patients has been investigated in several studies, but its feasibility has rarely been examinedin morbidly obese patients, such as in those with a body mass index (BMI) of ≥30 kg/m2. The present study aimed to evaluate thetechnical feasibility and safety of laparoscopic gastrectomy in morbidly obese patients with gastric cancer. Materials and Methods: A total of 1,512 gastric cancer patients who underwent laparoscopic distal gastrectomy (LDG) were divided intothree groups: normal (BMI<25 kg/m2, n=996), obese (BMI 25~30 kg/m2, n=471), and morbidly obese (BMI≥30 kg/m2, n=45). Short-term surgical outcomes, including the course of hospitalization and postoperative complications, were compared between thethree groups. Results: The morbidly obese group had a significantly longer operating time (240 minutes vs. 204 minutes, P=0.010) than the normalgroup, but no significant differences were found between the groups with respect to intraoperative blood loss or other complications. Inthe morbidly obese group, the postoperative morbidity and mortality rates were 13.3% and 0%, respectively, and the mean length ofhospital stay was 8.2 days, which were not significantly different from those in the normal group. Subgroup analysis showed that postoperativecomplication rates were not high in morbidly obese patients, independent of the type of anastomosis technique used and levelof lymph node dissection. Conclusions: LDG is technically feasible and safe in morbidly obese patients with a BMI of ≥30 kg/m2 and early gastric carcinoma. Exceptfor a longer operating time, LDG might represent a reasonable treatment option in these patients.

      • KCI등재후보
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