• Journal of Chest Surgery
• /
• 제20권3호
• /
• pp.458-472
• /
• 1987

A heart supplies bloods of about 15, 000 liters to each human organ in a day. A normal function of heart valves is necessary to this act of heart. The disease of heart valve develops to a narrowness of a closure, resulting in an abnormal circulation of bloods. In an attempt to eliminate the affliction of heart valves, the operation method to repair with artificial heart valves has been developed and saved numerous patients over past 30 years. This replacement operation has been performed since early 1960`s in Korea, but all the artificial heart valves used are imported from abroad with very high costs until recent years. The artificial heart valve using pyrolytic carbon has been developed at KAIST, which was proved to be stable in the mechanical performance and durability. Therefore, the in viva performance of this valve was examined through animal tests. The artificial heart valves used in this study are tilting disc type valves, in which the disc were made of graphite coated with pyrolytic carbon and the cages were made of titanium. In viva testings of these valves were performed in 12 dogs, in which right ventriculo-pulmonary arterial [Croup I] or inter-aortic [Croup IV] valved conduit was implanted using polytetrafluoroethylene conduits containing KAIST valve and aortic valve [Group II] or pulmonary valve [Croup III] was replaced by a KAIST valve with a 21mm or 19mm tissue annulus diameter. In group I and II, pre-and post-operative transvalvular pressure gradient was measured and compared with other prosthetic valves. During post operative period laboratory examination was performed including hemoglobin, hematocrit, red cell count, white cell, lactic acid dehydrogenase and platelet. The eight surviving dogs were sacrificed and autopsy was performed at 2, 6, and 8 weeks. KAIST valve has low transvalvular gradient and relatively high orifice area. Average ventriculo-aortic peak systolic transvalvular gradient was 14 mmHg in 21 mm valve and 19 mmHg in 19 mm valve. The valve has slight intravascular hemolysis effect. Thrombogenic effect of low polishing quality and eddy currents around small orifice is high. The valve has vulnerability of disc movement. These animal tests suggest that the improvement of the heart valve design, surface polishing state and prescription methods.

• The International Journal of Costume Culture
• /
• 제2권1호
• /
• pp.31-42
• /
• 1999

The category killer that has been rapidly growing mainly in advanced countries since early 1990's, is a mew distribution model which aims for obtaining market controlling power by surpassing competing businesses in a specific area of products. The domestic situation of category killers is very different from that of advanced ones abroad since it has just been introduced into the Korean market. At the moment, there are only 10 or so companies operating in the market : Geopyung's , Taeheng's , Midopa's , of Sinsegye Department store, adn of Yerim International. The purpose of this study is to examine problems of domestic companies in the present market by analysing the operation status of category killers in domestic markets as well as foreign ones, and to suggest a counter-strategy of category killers for the distribution environment of the 21st century to improve the competitiveness of Korean distribution industry. The competitiveness of category killers lies above all in products lines. Category killers are equipped with the greatest number of products lines among those of competing businesses due to maximized product selections in an limited range. Another source of competitiveness may be found in balanced strategy positioning. That is to say, category killers are in a position where they can adjust policies towards any of the three purposes while aiming at them altogether : prices of discount stores, products range of specialty stores, and customer service level of department stores. It is also necessary for efficient store operation to use information technology such as electronic data interchange (EDI), electronic pose system(EPOS) and electronic funds transfer (EFTPOS). As for the cost structure, category killers can gain an advantage over other business since operating cost of various sections can be saved. There are, however, certain risks that category killers with strong competitiveness may influence on other businesses a great deal and even facilitate their decline. Yet it seems that the growth of category killers will be more viciously restrained by continuous challenges from other businesses. The distribution industry is supposed to develop through such competition and restraint.

• 대한본초학회지
• /
• 제36권5호
• /
• pp.29-36
• /
• 2021

Objectives : The purpose of this study was to fix the synonyms, origin, formation mechanism, description, and efficacy of Hwangnapchim in Elucidation of Materia Medica. Methods : Through searching histories and herbal classics, We categorized the contents, and compared with Aquilariae Lignum Resinatum. Results : The synonyms of Hwangnapchim were classified by 3 categories : Napchimhyang-type, Ganamhyang-type and Ginamhyang-type. In early period, it was called by Napchimhyang-type, named after its description that was similar to beeswax. Afterward it was called by Ganamhyang-type or Ginamhyang-type, because of the name "Kynam" that was called by in its producing region. And there were records of producing region of Vietnam, Cambodia, and being from abroad, while those of Vietnam were most frequent. According to custom duties of Ming Dynasty, Hwangnapchim was 17.5 times as expensive as Agarwood. Hwangnapchim shared main producing region, original plant, and process of formation with Agarwood. Therefore, its original plant was Aquilaria crassna, but added honey during formation process. Hwangnapchim was classified 5 types according to its description, the highest quality was Yu-gyeol, resembled beeswax, and easily recovered if get a scar. Hwangnapchim had a fragrance at room temperature, a spicy flavor, and the efficacy of blocking urine and feces. Conclusions : These results showed that Vietnam was major producing area of Hwangnapchim, and that it shared same origin with Agarwood, but it had different description, efficacy, and higher prices because of being added honey during formation.

• 한국작물학회:학술대회논문집
• /
• 한국작물학회 2023년도 춘계학술대회
• /
• pp.79-79
• /
• 2023

With the development of digital technology, the size of the smart agriculture market at home and abroad is rapidly expanding. It is necessary to establish a foundation for sustainable precision agriculture in order to respond to the aging of rural areas and labor shortages. This study was conducted to establish an automated digital agricultural test bed for soybean production management using data suitable for agricultural environmental conditions in Korea and to demonstrate the field of leading complexes. In order to manage water smartly, we installed a subsurface drip irrigation system in the upland field and an underground water level control system in the paddy field. Based on data collected from sensors, water management was controlled by utilizing an integrated control system. Irrigation was carried out when the soil moisture was less than 20%. For effective water management, soil moisture was measured at the surface, 15cm, and 30cm depth. The main growth characteristics and yield, such as stem length, number of branches, and number of nodes of the main stem, were investigated during the main growth period. During the operation of the test bed, drought appeared during the early vegetative growth period and maturity period, but in the open field smart agriculture test bed, water was automatically supplied, reducing labor by 53% and increasing yield by 2%. A test bed was installed for each field digital farming element technology, and it is planned to verify it once more this year. In the future, we plan to expand the field digital farming technology developed for leading farmers to the field.

• Journal of Chest Surgery
• /
• 제23권4호
• /
• pp.617-621
• /
• 1990

A heart supplies blood of about 15, 000 liters to each human organ in a day. A normal function of heart valves is necessary to accomplish these enormous work of heart. The disease of heart valve develops to a narrowness of a closure, resulting in an abnormal circulation of blood. In an attempt to eliminate the affliction of heart valves, the operative method to replace with artificial heart valves has developed and saved numerous patients over past 30 years. This replacement operation has been performed since early 1960`s in Korea, but all the artificial heart valves used are imported from abroad with very high costs until recent years. New artificial heart valves have been developed in Korea Advanced Institute of Science and Technology since early 1980`s. The first developed valve was designed with a free-floating pyrolytic carbon disk that is suspended in a titanium cage. The design of the valve was tested in vitro, and in animals in 1987. The results from this study was that the eccentrically placed struts creates a major and minor orifice when the disc opens and stagnation of flow in the area of the minor orifice has led to valve thrombosis. In this work, the design of the valve was changed from a single - leaflet valve to double - leaflet one in order to resolve the problems observed in the first - year tests. Morphological and hemodynamic studies were made for the newly designed valves through the in vitro and in vivo tests. The design and partial materials of the artificial heart valve was improved comparing with first - year`s model. The disc in the valve was modified from single - leaflet to bi - leaflet, and the material of the cage was changed from titanium metal to silicon - alloyed pyrolytic carbon. A test was made for the valve in order to examine its mechanical performance and stability. Morphological and hemodynamic studies were made for the valve that had been implanted in tricuspid position of mongrel dogs. All the test animals were observed just before the deaths. A new artificial heart valve was designed and fabricated in order to resolve the problems observed in the old model. The new valve was verified to have good stability and high resistance to wear through the performance tests. The hemodynamic properties of the valve after implantation were also estimated to be good in animal tests. Therefore, the results suggest that the newly designed valve in this work has a good quality in view of the biocompatibility. However, valve thrombosis on valve leaflets and annulus were found. This morphological findings were in accordance with results of surface polishing status studies, indicating that a technique of fine polishing of the surface is necessary to develop a valve with higher quality and performance.

• 산업융합연구
• /
• 제20권9호
• /
• pp.39-45
• /
• 2022

인물지칭 신어는 일상생활에서 사용 빈도와 전파 속도가 높으며, 만들어진 시대의 생활양식이나 문화현상을 잘 반영한다. 본 연구는 2017년과 2018년 한국과 중국에서 생겨난 인물지칭 신어를 바탕으로 당시의 사회·문화 현상을 비교 분석했다. 한·중 양국의 인물지칭 신어를 개인생활, 가정생활, 직장생활 세 분야로 나누고, 연구 방법은 정성분석과 대조 분석을 채택했다. 한국에서는 자신의 기준에 따라 행복을 추구하는 다양한 생활방식이 생겨났으며, 합리적이고 절약적인 소비를 추구하는 소비자가 늘어났다. 반면 중국에서는 무절제한 쇼핑이 이슈가 되었다. 한국에서는 미혼이나 비혼의 청년 1인 가구가 많았으며 중국에서는 결혼 후 1인 가구가 되는 경우가 많았다. 중국에서는 도시화에 따른 이혼이 급증하였고, 한국에서는 자녀의 독립 후 이혼을 택하는 부부가 많았다. 한국의 자녀는 결혼 후에도 육아 등을 부모에게 의지하는 경우가 많았고, 부모 세대는 노후에 빈곤하고 소외되는 경향이 있었다. 한편 중국에서는 조기 유학 열풍이 불었다. 한국과 중국 청년층은 구직난을 겪었고 취업 후 고단한 직장생활을 자조하며 이직이나 퇴직을 준비하기도 하였다. 향후 연구에서는 최신 신어 자료를 보강한 후 한국어 신어 지도방안을 연구하면 중국인 학습자들이 한국의 사회와 문화를 이해하는 데에 도움이 될 것이다.

• 한국의류산업학회지
• /
• 제12권3호
• /
• pp.291-301
• /
• 2010

Today Korean clothing companies are experiencing difficulties in the global market due to unfavorable business conditions including poor production environments, labor shortage, rising costs, the further opening of the domestic distribution market, and increased competition among them. As a result, this has caused many of Korean clothing companies to transfer their production bases abroad in search of relatively inexpensive labor force, instead of using domestic plants. This study attempted to examine how Korean clothing companies perceive production environments and labor standards with regard to their offshore outsourcing. In such an attempt, in-depth interviews were conducted with 24 brand-name clothing firms. Those interviewed firms were the brands for the domestic or foreign market that were found to produce more than 200,000 pieces of clothing per year, and also the group of interviewees included some promotion service providers. The key findings from this study are as follows: First, a large number of the interviewed clothing companies were found to manage their foreign contract manufacturers by "visiting their factories regularly on a seasonal basis" or "stationing their personnel in factory for management purposes." Second, in relation to quality control in their foreign manufacturers, the most frequent response was to "have personnel stationed in those manufacturers." A smaller number of the clothing companies answered that they had "engaged their production management teams in quality control from time to time," or "used their inspectors to inspect products." Third, when asked about labor standards in foreign contract manufacturers, the largest number of the clothing companies responded, "we apply our own standards." The results of this study suggest that most of domestic clothing companies still use offshore sourcing just as a means of reducing their initial labor costs. However, in the continuously changing environment of the global clothing industry, clothing businesses are required to escape from the early phases of their manufacturing environments and set up more globalized standards.

• 대한공간정보학회지
• /
• 제24권1호
• /
• pp.61-68
• /
• 2016

최근 디지털 항공영상은 우수한 촬영기하와 높은 공간 및 방사해상도로 인하여 대축척 지도제작에 보편적으로 활용되고 있다. 하지만 제작된 결과물에 대한 높은 정밀도와 신뢰도의 확보를 위해서는 촬영된 영상의 품질검증 작업이 선행되어야 한다. 국외에서는 영구적인 항공카메라 검정용 테스트베드를 구축하여 영상취득 시스템을 검증하는 실험적 연구가 활발히 진행되고 있다. 반면 국내에서는 아직 관련 분야에 관한 연구와 실험이 미흡하여 영상의 품질검증을 위한 실용적인 방안의 제시가 절실한 실정이다. 따라서 본 연구에서는 휴대용 Siemens star 타겟을 이용하여 시각적인 방법으로 손쉽게 영상의 공간해상도를 측정하는 방법을 제시하고자 하였다. 본 연구에 이용된 영상은 면형 방식의 DMC, UltraCamXp와 선형방식의 ADS80 등 세 종류의 카메라로 취득하였다. 촬영된 영상에서 Siemens star 타겟을 추출하여 시각적인 방법으로 영상의 해상도를 이론적인 GSD(Ground Sample Distance)와 비교하였다. 아울러 Siemens star 타겟이 촬영된 영상의 위치와 비행방향 및 비행직각 방향에 따라 공간해상도의 변화를 비교 분석하였다. 본 연구의 결과, 카메라별 촬영된 영상의 이론적 GSD는 약 6~9cm인 반면, 시각적 해상도는 이론적인 GSD에 비하여 약 1.2~1.3배 정도 크게 측정됨을 알 수 있었다.

• 유통과학연구
• /
• 제13권7호
• /
• pp.63-71
• /
• 2015

Purpose - The characteristics of the modern management environment in Korea clearly involve the limitations of knowledge management, globalization, changes in industrial structures, polarization of the economy, consumption, and education, and the demand for creative management. To achieve a continuous competitive advantage for individuals as well as organizations, Wisdom Management can be said to be a paradigm for the current environment. The Research is an alternative to environmental management in the early study of the need to conceptualize the theoretical approach to wisdom management. In other words, it presents a new management paradigm for a business environment of uncertainty and unpredictability. Furthermore, it aims to propose Wisdom Management as an alternative in the modern management environment as well as a topic of discourse. Its purpose is to provide basic knowledge to people who study and practice in this field to strengthen the competitiveness of individuals and companies. Research design, data, and methodology - This paper first provides six characteristics of the current management environment at home and abroad. It then attempts to emphasize the necessity of wisdom based on such characteristics by classifying wisdom according to recent management study research. This allows the derivation of definitions of wisdom management, suggesting its components and properties. Results - The six characteristics of the modern business environment are: 1) limits of knowledge, 2) intensifying globalized competition, 3) changes in industry structure - IoT (Internet of all Things) trend, 4) serious polarization and social unrest diffusion, 5) personal and organizational competitiveness creativity requirements, and 6) domestic special national and social situations. Therefore, accordingly, wisdom can be defined and classified as: wisdom that offers potential integration beyond knowledge, practicing and maintaining knowledge wisdom as an efficient strategy for an organization wisdom as a decision-making process that addresses ambivalence wisdom as the pursuit of common goods based on ethics; and, wisdom as creativity that involves intuition and insight. This paper attempts to define Wisdom Management in accordance with these definitions of wisdom. Wisdom Management is a management system that is awareof the current environment given in the multidimensional perspective, achieves the efficiency of the organization and the goals of common good through an uncertain decision-making process, based on the organization of individual and organizational knowledge, and the internal experiences and resources. Wisdom Management components include human beings, virtue, knowledge, creativity, and ambivalent thinking. Its properties include intentionality, self-destructiveness, creative and ethical reflexivity, complexity, insight, unpredictability, ambivalence, and wholeness. Conclusions - Since all organizations face the limitations of their environment, crises, and opportunities, applying wisdom in management to develop as Wisdom Management can be an inevitable alternative to the uncertainties of the management environment faced by modern society. The conceptualization of Wisdom Management forms a valuable context to further advance knowledge management theory into practice. It is also a cornerstone of strategic management and can provide insight into its potential for success and implementation.

• 문화기술의 융합
• /
• 제10권3호
• /
• pp.749-761
• /
• 2024

본 연구는 재한 중국인 유학생들의 문화정체감, 학습 동기, 학습전략 및 제2 언어 습득의 경향을 분석함으로써 이 네 가지 변인의 구조 관계를 밝히고 이를 통해 한국어 학습 과정에서 유학생의 문화정체감과 학습 동기, 학습전략을 촉진하는 데 있어서 기초자료를 제공하는 데 그 목적이 있다. 본 연구는 200명을 대상으로 예비조사를 통해 신뢰도와 타당성을 검증하였다. 본조사는 2023년 5월 28일부터 6월 15일까지 서울, 경기도, 부산, 충청도 소재 6개 대학의 중국유학생 1,006명을 대상으로 설문을 실시하였다. 연구결과, 첫째, 변인 간의 구조적 관계는, 문화정체감은 학습 동기, 학습전략 및 제2언어 습득에 정적으로 영향을 주었다. 둘째, 학습 동기는 학습전략, 제2언어 습득에 정적(+)으로 영향을 주었다. 셋째, 학습전략은 제2언어 습득에 정적(+)으로 영향을 주었다. 넷째, 문화정체감과 학습전략 간의 학습동기와 학습전략은 정적인(+) 매개 역할과 다중 매개 역할을 하는 것으로 나타났다. 따라서 국어 학습 과정에서 유학생의 문화정체감과 학습 동기, 학습전략을 촉진하기 위해서 유학생들의 문화정체감 형성의 직접적 체험을 기회를 늘리고 실제 중심의 다각적인 교육과정의 편성 및 교수법이 필요함을 시사하고 있다.