• 지능정보연구
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• 제17권1호
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• pp.127-138
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• 2011

대부분의 연구포털 사이트는 관심 분야의 논문을 획득하고자 하는 연구자를 대상으로 한 서비스를 주로 제공하고 있다. 하지만 이러한 서비스는 정확한 서지사항을 알고 있는 일부 사용자의 경우 손쉽게 이용할 수 있지만, 대부분의 이용자는 원하는 자료를 획득하기 위해 키워드 검색을 통한 반복적 시행착오를 겪게 된다. 특히 사용자가 익숙하지 않은 분야의 논문을 검색하는 경우에는, 찾고자 하는 논문의 적절한 키워드 자체를 알지 못하여 검색에 큰 어려움을 겪게 된다. 이러한 한계를 극복하기 위해 일부 연구포털 사이트에서는 온라인 쇼핑몰의 상품 추천에 주로 사용되어온 연관관계 분석 기반 키워드 추천 서비스를 채택하고 있다. 하지만 연관관계 분석에만 기반한 키워드 추천 방식은 두 키워드간의 단편적인 관계만을 알려줄 뿐, 해당 학술 분야와 관련된 전체 키워드 간의 복합적 연결 관계를 보여주기에는 한계가 있다. 따라서 본 논문에서는 연관관계 분석을 통해 빈발 출현 키워드 쌍을 추출하고 이를 근거로 전체 키워드 간 네트워크를 구축함으로써, 학술 분야별 중심 키워드 및 분야 간 융합을 위한 연계 키워드를 추천하기 위한 방법을 제시하고자 한다.

• 전기전자학회논문지
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• 제22권1호
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• pp.127-135
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• 2018

본 논문에서는 MNR(Mu-negative) Metamaterial 단일 셀을 사용하여 700 MHz UHD 방송 대역과 2.45 GHz/5 GHz WiFi 대역에서 동작하는 삼중대역 폴디드 모노폴 안테나 설계에 관하여 연구하였다. MNG metamaterial 단일셀이 MZR(Mu zero resonator)에서 동작하도록 안테나 기판 뒷면에 커패시터를 형성하고, 스트립선로와 비아홀을 통해서 접지면과 연결하여 구현하였다. 이를 통해서 700 MHz대역에서 영차모드에서 공진하도록 공진점을 제어할 수 있고, 대역폭을 개선할 수 있다. 최종적으로 700 MHz UHD방송 대역과 2.45 GHz/5 GHz WiFi 대역에서 동작하는 안테나를 구현하였다. 설계 제작한 안테나의 크기는 $100{\times}100mm^2$이고, 실험 결과 첫 번째 공진점에서 10 dB 대역폭과 이득은 각각 309 MHz(41.2%), 5.298 dB이며, 두 번째 공진점에서 10 dB 대역폭과 이득은 각각 821.9 MHz(33.5%), 2.7840 dB이며, 세번째 공진점에서 10 dB 대역폭과 이득은 각각 1.1314 GHz(20.6%), 2.9484 dB의 결과를 확인하였다. 안테나의 공진주파수는 이론과 실험이 일치함을 확인하였다. 그리고 방사패턴은 대체적으로 전방향 특성을 가지고 있으며, 0.75 GHz와 2.45 GHz에서는 측면보다 전방향과 후방향으로 방사특성이 양호하며, 5.5 GHz에서는 다중로브를 갖는 방사패턴 특성을 확인하였다.

• 대한치과보철학회지
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• 제34권1호
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• pp.101-124
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• 1996

In this study, we designed the finite element models of mandible with varying their connecting types between the prosthesis on implant fixture and 2nd premolar, which were free-standing case(Mf), precision attachment case(Mp), semiprecision attachment case(Ms) and telescopic case(Mt). The basic model of the designed finite element models, which contained a canine and the 1st & 2nd premolar, was implanted in the edentulous site of the 1st & 2nd molar by two implant fixtures. We applied the load in all models by two ways. A vertical load of 200N was applied at each central fossa of 2nd premolar and 1st implant. A tilting load of 20N with inclination of $45^{\circ}$ to lingual side was applied to buccal cusp tips of each 2nd premolar and 1st implant. And then we analyzed three-dimensional finite element models, making a comparative study of principal stress and displacement in four cases respectively. Three-dimensional finite element analysis was performed for the stress distribution and the displacement using commercial software(IDEAS program) for SUN-SPARC workstation. The results were as follows : 1 Under vertical load or tilting load, maximum displacement appeared at the 2nd premolar. Semiprecision case showed the largest maximum displacement, and maximum displacement reduced in the order of precision attachment, free-standing and telescopic case. 2. Under vertical load. the pattern of displacement of the 1st implant appeared mesio-inclined because of the 2nd implant splinted together. But displacement pattern of the 2nd premolar varied according to their connection type with prosthesis. The 2nd premolar showed a little mesio-inclined vertical displacement in case of free-standing and disto-inclined vertical displacement due to attachment in case of precision and semiprecision attachment. In telescopic case, the largest mesio-inclined vertical displacement has been shown, so, the 1st premolar leaned mesial side. 3. Under tilting load, The pattern of displacement was similar in all four cases which appeared displaced to lingual side. But, the maximum displacement of 2nd premolar appeared larger than that of the first implant. Therefore, there was large discrepancy in displacement between natural tooth and implant during tilting load. 4. Under vertical load, the maximum compressive stress appeared at the 1st implant's neck. Semiprecision attachment case showed the largest maximum compressive stress, and the maximum compressive stress reduced in the order of precision attachment, telescopic and free-standing case. 5 Under vertical load, the maximum tensile stress appeared at the 2nd implant's distal neck. Semiprecision attachment case showed the largest maximum tensile stress, and the maximum tensile stress reduced in the order of precision attachment, telescopic and free-standing case. 6. Under vertical load or tilting load, principal stress appeared little between natural tooth & implant in free-standing case, but large principal stress was distributed at upper crown and distal contact site of the 2nd premolar in telescopic case. Principal stress appeared large at keyway & around keyway of distal contact site of the 2nd premolar in precision and semiprecision attachment case, appearing more broad and homogeneous in precision attachment case than in semiprecision attachment case.

• 대한치과보철학회지
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• 제36권6호
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• pp.858-866
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• 1998

Soldering is the usual method used to correct an unstable fixed partial denture framework at patient's try-in; However, presoldering base metal alloys is technique-sensitve and results are unstable because it is difficult to maintain uniform heat distribution and to prevent oxidation of an alloy. A cast-joining technique has been developed by Weiss and Munyon for repair, correction and addition to base metal framework. This joining technique eliminates the problem with presoldering of non-precious frameworks. The object of this study was to 1) compare the relative flexure strength and the joining effectiveness of Ni-Cr-Be cast in two pieces and 'pre-soldered' versus in two pieces and 'cast-joined'. 2) determine the effect of increasing the number of retentive grooves on the face of the cast and 3) determine the effect of the relative matched position of groove patterns on flexure strength. The joining effectiveness can be expressed by the ratio of the mean flexure stress of soldered or cast-joined specimens to that of one-piece cast. Resin rods 3mm in diameter were used as pattern of specimens for one-piece casted, presoldered, and cast-joined groups. Cast-joined specimens had two different patterns of retentive grooves on the joined faces. Type A had cross-shaped grooves 1mm in depth. 0.6mm in width. Type B was the same except for the addition of one more retentive groove. In the experiment connecting cast-joined specimens, half of specimens with type A pattern had their patterns on the faces of paired casts matched with each other as mirror image. With the rest pairs, it was proceeded that one of paired casts turned 45 degrees so that the patterns crossed. Half of specimens with type B pattern also had the patterns matched as mirror image; However, here, one of paired casts turned 90 degrees with the other pairs. Retentive groove in this study lacked the intentional undercuts, in contrast with the suggestion of Weiss and Munyon. The specimens were subjected to four-point flexural loading in an Instron testing machine. The midspan flexural stress was calculated at the point of initial plastic strain as determined from a strip-chart recorder or at the point of failure if this occured at a lower stress level. Within the scope of this study, the following results were obtained. 1. The presoldered group showed flexural strength at least 2 times higher than the cast-joined groups. Its joining effectiveness was 82%. 2. In cast-joined groups, the flexural strength of joints with type B patterns exhibited 1.5 times that of joints with type A patterns. Joining effectivenesses were 38% for type B patterns, 25-26% for type A patterns. 3. The relative matched position of groove patterns did not have any significant effect on flexural strength of the cast-joined specimens with either type A patterns or type B patterns(p>.05).

• 대한한의학원전학회지
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• 제25권1호
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• pp.1-16
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• 2012

"Yixuerumen" is a comprehensive medical text published in the Ming-dynasty by Li Chan(李梴). In this text, Sanghan(傷寒, cold damage) is categorized among external contraction(外感) with much emphasis. The subject of this study is the verse "The Principal and secondary aspects must first be decided." and its annotations in the in the Sanghan chapter of "Yixuerumen". The complex theoretical structure of this verse was firstly analyzed, together with the historical background of how and why Li Chan adopted this concept. The Pyo-Bon concept is the contrast between phenomena(標) and its underlying source of motivation(本). The methodology for this study was to compare and analyze this main verse with contents on Sanghan and Un-gi(運氣) within the text, while reviewing historical theories explaining the physiology and pathology of the human body in terms of the Pyo-bon(標本) concept. As a result, we discovered that the Pyo-bon(標本) concept used in the aforementioned verse of "Yixuerumen" matches the Three Eum Three Yang(三陰三陽)-標本中氣(pyo-bon-jung gi)-gi transformation(氣化) theory of Un-gi(運氣). Li Chan created the connecting link in understanding the Three Eum Three Yang diagnosis system through the viscera/bowels theory(臟腑論) by adopting the Three Eum Three Yang(三陰三陽)-標本中氣(pyo-bon-jung gi)-gi transformation(氣化) theory from Un-gi. Li's work lead to several changes in the field of Sanghan. First, Li understood the disease pattern of Sanghan by using the accumulated knowledge of the viscera/bowel theory during the Jin-Yuan dynasty, and developed a medical perspective that observes the disease pattern based on the body's essence gi(精氣). Second, he set the category of the Sanghan-Three Eum Three Yang disease pattern, establishing a separate guideline. Third, by adding knowledge of herbs to the accumulated knowledge of the viscera/bowel theory, the process of diagnosis and herbal application were made explicable. On the other hand, in the process of interpreting the 三陰三陽 diagnosis system with viscera/bowels theory, theoretical inconsistencies appeared, of which Li tried to mend by several means. The results of the research on "Yixuerumen(醫學入門) the Sanghan chapter(傷寒篇)" calls for further studies, as it has effected both "Dongeuibogam(東醫寶鑑) the Sanghan part(寒門)" and "Dongeuisoosebowon(東醫壽世保元)" as well.

• 화약ㆍ발파
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• 제35권1호
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• pp.43-52
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• 2017

우리나라는 산지와 구릉지가 전 국토 면적의 70% 이상을 정하고 있어 국토 확장, 고속도로 건설, 지하철공사 등의 대형 토목사업과 도심지 아파트 신축과 재개발, 고층건물 신축 등 부지공사 과정에서 암반굴착이 불가피한 경우가 많다. 이러한 대 소형 공사 시 ~ 차질을 받는 경우가 많다. 이에 따라 소음과 지반진동을 감소시키는 발파방법의 적용이 필요하다. 이러한 경우에 적합한 발파방법으로 지금까지 미진동발파, 기계식 굴착공법(할암, Breaker 등), 유사 발파 공법(플라즈마, 겔파쇄 등)이 있다. 본 연구에서는 기존의 미진동 발파에서 사용되고 있는 New KINECKER-I의 순폭성과 배합비 등을 개선하여 경제성 및 시공성을 높인 New KINECKER-II의 특징과 성능을 알아보고 발파진동 추정식을 산출하여 표준 발파패턴 및 시공 방법을 제시하여 사용자의 제품 사용편의를 제공하고자 한다. 또한 연결캡을 사용하여 하나의 뇌관으로 공내 모든 폭약이 순폭됨을 확인하였다.

• 패션비즈니스
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• 제1권2호
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• pp.46-54
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• 1997

The purpose of this study is to understand women's wear manufacturing industries. First, the study was to investigate the present production systems and how much the automatic facility are by comparing them. This study enhanced more efficient, stable, and suitable work line. This intern will direct the way in which automatic facilities will be created. Second, through this study on the general character of the inspectors, the ratio of impaired goods, and the reasons for unsatisfactory goods, I intended to find out a way to decrease the impaired goods and to produce competitive and high quality goods. The results of the survey can be summarized as follows; 1. The result of the research on the automatic industrial facilities shows that the majority of the factories (77.4%) are 40% below the automatic facility rate. The reasons for this according to order are that was a deficit in money, no reason for expensive machines, and lack of the technique and the number of workers required to handle the machines. 2. At this time, the most required equipments are shown according to its importance; automatic sewing machine, automatic cutting machine, automatic spreading machine, and finishing & pressing machine. So in the women's wear manufacturing industries, they think that they need more automatic cutting machine, automatic spreading machine in the cutting field rather than high price automatic machine in the sewing field such as pattern former, pocket welting, automatic sleeve connecting machine and automatic label connecting machine. 3. The result of the research in the goods quality shows that the average impaired rate is 12.7% at the first inspection. In addition the average rate for complete impaired rate is 1.52%. The line system shows that it has a impaired rate that is double the rate of the pair system. Because of this, the industries plan to combine the line system and pair system to create an improved and suitable production system which can boost the quality and productivity of the goods. 4. The fabric is the main point of the impaired goods. The factors of the impaired goods in manufacturing are the lack of mental abilities of the worker, impaired fabrics and a lack of cooperation in the working system. Furthermore, there is a lack of technique for new material. 5. To prohibit impaired goods in manufacturing, there need to be a way to educate the workers and to enhance the workers' mind on the productive goods. Also there need to increase in the investments of automatic production machines. Finally there need to be a standardized working line. Therefore, there need to be an improvement on the management of the production of goods, the development of technique and an increase in the education for the workers, with this there will be a decrease in impaired goods, and an increase in better quality of goods to enforce the domestic apparel industries.

• Archives of Plastic Surgery
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• 제38권4호
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• pp.408-414
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• 2011

Purpose: To correct breast ptosis, reduction mammoplasty and mastopexy have been developed in a way that minimizes complications. Recently, as the mean age of breast cancer occurrence is decreasing, the need for breast reconstruction in patients with breast cancer is rising. If mastopexy is performed with breast reconstruction at the same time, the size of the normal breast and the new one is not quite different. We decided to apply Z-plasty, which is a widely-used technique in plastic surgery to lengthen or change the direction of tension of the tissue. Methods: From March 2008 to December 2009, we performed breast reconstruction in 6 patients with breast cancer and scar contracture. After breast reconstruction, mastopexy with Z-plasty was applied to correct the asymmetry. The new nipple-areolar complex is placed on the line connecting the midclavicle and the current nipple. The inferior border of the new areola corresponds with the inferior border of the original areola, and the superior border about 2 cm upward the original superior border. We drew two oblique lines connecting the medial end of the incision line lower to the nipple-areola complex and the lateral end of the inframammary fold for Z-plasty. The excess tissue between these two lines was removed and the new triangular flaps were put together. Results: The average age of patients was 42.6 years, aged from 36.1 to 48.1 The weight of removed tissue was between 54g and 95 g, with the mean of 74 g. The average distance from the midclavicle to the nipple was 24 cm before surgery, and 21 cm after the surgery. The average operation time per patient (1 mastopexy) was 45 minutes, and the patients were satisfied with the size and shape. Conclusion: Applying Z-plasty for the mastopexy on the normal breast ptosis is a relatively simple way to achieve symmetry in patients who need breast reconstruction.

• 한국해양학회지:바다
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• 제11권2호
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• pp.37-48
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• 2006

2003년 6월에 고군산군도와 비응도를 완전히 연결한 새만금 4호 방조제의 완공이 연안역 표층 $M_2$조류분포에 미치는 영향을 알아보기 위하여 2002년과 2004년에 HF radar로 관측된 유동자료를 분석하였다. 분석에 사용된 자료와 유속계 계류에 의해 관측된 자료는 좋은 일치를 보였다. $M_2$조류는 관측구역 내에서 반시계방향의 회전성을 보였으며 방조제 완전 체절로 인하여 회전방향이 변경되지는 알았다. 2002년에는 방조제의 미체절 구간을 통해 서쪽으로 향하던 ebb jet가 관측되었지만, 2004년에는 이 흐름이 나타나지 않았다. 방조제 완전체절로 인하여 금강하구 입구부근에서 유속이 증가하였고, 고군산군도 및 방조제 부근에는 유속이 감소하였으며 최강 창조류의 방향이 동서방향에서 남북방향으로 변화되었고 최강 창조류 발생시각이 늦어졌다. 연도 주변해역에서도 최강 창조류 방향이 시계방향으로 변경되었으나 최강 창조류 발생시각은 오히려 빨라졌다. 이러한 $M_2$ 조류타원 특성의 변화는 방조제 체절의 영향이 연도와 말도를 잇는 지역까지 미치고 있음을 의미한다.

• Journal of Acupuncture Research
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• 제17권1호
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• pp.27-41
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• 2000

The meridian system is the most essential and basic connecting structure that maintains the vital activities of viscera and bowels by connecting them with each part of body's surface. Doctors can understand the healthy condition, and the region and deficiency-excessiveness of disease by observing the condition of Qi flowing. Deficiency and excessiveness could be differentiated by various symptoms expressed in meridian system. Especially there could be several clues like pain, heat-cold, protuberance-depression, change of color and shine in the line of channel leads to the judgment of deficiency-excessiveness The diagnosis of deficiency and excessiveness can be generalized by quantification of elastic status in skin surface along the meridian system. By comparing data from measurement of elastic condition with those from traditional deficiency and excessiveness, it could be utilized for the development of oriental medicine. All biological activities in the human body are based on meridian system according to the oriental medicine. Also the meridian system is viewed as basic and essential structure connecting internal viscera and each part of body. The areas of expressed channel phenomena are muscle to bone, muscle to muscle and bone to bone. These areas are called depression where meridian system is present and any changing state on those points can be measured. It could be difficult in diagnosing the reaction of meridian system because doctor can depend on his own judgment. Therefore, it is necessary to quantify and indexate channel reactions. To quantify the channel reactions, specially manufactured instrument was used to quantify the protuberance and depression to differentiate the deficiency and excessiveness. The results follow as below; 1. The elastic index measurement by the equipment proved a pattern of agreement showing the values that ranged within standard deviation 0.05kgf/cm throughout the experiment except few cases' measurement in CV-17. 2. To evaluate the state of deficiency & excessiveness of elastic index measurements in frontal point, elastic index measurements in the front paint were compared to the elastic index measured surrounding the point within 2.5 cm. Such result of indexing procedure was closely matched to the concept of palpitation. 3. If the elastic index values in the surrounding front point closely located to the elastic index values in the front point, the judgement on the state of deficiency and excessiveness was delayed. Otherwise, it was judged as deficiency or excessiveness. 4. Out of total 12 cases of comparing the elastic index values to the elastic index values in the surrounding front point, Three to nine front points were judged as either in the state of deficiency or excessiveness. 5. Among the nine front points judged as either in the state of deficiency or excessiveness, Four cases were matched to the electric index measured by EAV that evaluating the internal organs by five different phases. If more clinical cases are accumulated, it is expected to systematically theorize and improve the concept of deficiency and excessiveness in the internal organs using the front point.