대장직장종양에 있어서 Hand-Assisted Laparoscopic Surgery (HALS)의 초기 경험

조호영,최선근,구지회,허윤석,이건영,김세중,조영업,안승익,홍기천,신석환,김경래,우제홍 대한내시경복강경외과학회 2003 대한내시경복강경외과학회지 Vol.6 No.-

유아행동에 대한 학력 및 경력별 교사귀인 방식

조희숙,홍석진 부산대학교 영유아보육연구소 1997 영유아보육연구 Vol.3 No.-

This study aims to explore the effects of career of teachers, year of education of the teachers, and school which teacher serves upon teacher's attribution style on children's misbehavior. 98 preschool teachers and 60 primary school teachers participated in this study. The major findings of this study were as follows: First, there was any significant difference on teacher's attribution style upon the children's misbehavior between two groups of teacher's career. Second, there was a significant difference on teacher's attribution style upon the children's misbehavior between two groups of teacher's year of education. Third, there was a significant difference on teacher's attribution style upon the children's misbehavior according to the kinds of school which the teacher serves.

스포츠 관광 활성화 개선방안에 관한 연구

조충현,김홍식,박은석,강성찬,이동헌 圓光大學校 附設 體力科學硏究所 2003 體力科學硏究 Vol.26 No.1

This study was conducted to investigate the effects of the marketing strategy based on the traditional wrestling, which affects the tour industry. The study used the simple random sampling method in the group of the Kwang-Ju district citizens. The group representatives were directly interviewed, and 277 interviewees replied with concern. The rest of the interviewees were not interested in the survey. The general characteristics of the interviewees -- gender, age, education, job, monthly salary. -- were used to analyze the items related to Sports Tourism in general. Sport Tourism in general Male interviewees had higher recognition over females in the interview. The rate of experience was low for both genders. According to their education, the satisfaction of sport tourism showed low rate. However, there were many answers where the interviewees, not depending on the age or gender, indicated that they will participate in the future. The policy recommended based upon the results of the study is as follows. There is a need for setting up a new strategy in order to increase participation of sports. Also, it is urgent to set up a sports theme center to raise professional sportsmen and to supply them to where they are needed.

DDA(Doha Development Agenda) 환경협상동향과 환경분쟁 예방 방안

조석홍 韓國仲裁學會 2004 중재연구 Vol.14 No.1

It is a common and prevailing Construction that recent environmental problems such as earth's warmer climate and depletion of ozone layers can never be solved by the efforts of any one nation. That is why the international conventions have been held more often lately in order to discuss the matter of environment protection and there has been increased tendency of using economic activities of any nation especially their international trades as means for achieving the purpose of environment protection. Furthermore, there is an ample possibility for the advanced countries to use the regulatory restrictions for environment protection as an another measure of none-tariff barrier against countries including Korea which has high dependence on international trade with not very high technological capability of environment protection. Some of the developed countries have recently moved toward the creation of a new system of international regulatory measures on world trade in the name of Environment Protection. They plan to impose strict control over the process and technology of production of good they are importing from other country. However, ever though the international regulatory measures, in a short term, could play a negative role on our trade capability, they uld, in the long run, also play a role of helping hands if we efully work out positive countermeasures as a result of hand-working vernment supported by industry and all the society as a whole.

무산소성 운동이 혈청 지질 농도 및 면역세포 반응에 미치는 영향

조영주,변재철,홍석민 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.2

The purpose of this study was to determine serum lipids and immune responses on the anaerobic exercise. Serum total cholesterol, HDL-C, LDL-C and plasma triglyceride, percentages of WBC and their subsets, natural killer cells were evaluated between before and after the anaerobic power. All subjects were high trained male athletes (19-24 years of age). Results were expressed as mean and standard deviations. One-way ANOVA repeated measure was used to compare the all parameters between before and after the anaerobic power test. All significant differences were set at α=.05. In this study, comparison of anaerobic power(Nm/%BW) was higher in soccer players than ssirum and judo players (p<.05). The percentage of WBC, monocyte, eosinophil and basophil were no significant differences between before and after anaerobic exercise. There were increased on neutrophil, lymphocyte after anaerobic exercise in three groups. (p<.01, p<.001, respectively). Also, there were significant differences on T cell, B cell, NK cell between before and after anaerobic exercise (p<.001).

우리나라 B2B 전자상거래 효율화를 위한 시스템 구축 방안

조석홍,이희석 한국통상정보학회 2001 통상정보연구 Vol.3 No.2

B2B 전자상거래는 그 성장 잠재성이나 일국의 산업구조 전환에도 많은 영향을 미친다는 점에서 국가적 차원에서 효율적이며 지속적인 전략수립이 필요하다는 인식이 대두되었다. 현재 미국을 비롯하여 EC, 일본, 싱가포르, 중국등 주요국들의 정책동향을 살펴보았다. 전자상거래 정책의 범위 및 특징이 국가별로 상이하기도 하지만 논의동향이나 정책 등에서 주요국들이 범세계적으로 비슷한 정책형성을 나가고 있는 단계라고 할 수 있다. 다만 정책의 강조점이 선진국의 경우 전자상거래를 산업 민간부문의 우위를 바탕으로 전 세계적 수준에서의 표준화를 주도하려는 의지와 B2B 전자상거래 환경의 구축을 자국의 경쟁력 확보와 연결지어 중장기적 발전 비전을 제시하고 있다는 점에서 우리나라는 정부와 기업 등 여러 분야에서 대책이 필요하다.

연마 로봇의 원격 관리를 위한 모니터링 시스템 개발

고석조,이민철,홍창우 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-

In the previous study, a polishing robot system was developed to automate the polishing process and to cope with the shortage of skilled workers. This polishing robot system has several advantages: reduced time for setting polishing work, decreased labor costs, effective operation, continuous polishing work without an operator, improved machine accuracy, and the ability to polish a free curved surface die. However, still the problem remains that a worker must stay to monitor the polishing process in the poor working conditions for a long time. Nowadays some advanced manufacturing companies need to find a way to check the performance of their production equipments and plants from remote sites. Thus, this study constructed the communication network and developed the monitoring programs (a servo program and a client program) to operate the polishing robot from remote sites. Using these programs, workers are able to monitor and control the polishing robot on the web page, in any place where internet service is possible. To guarantee a stable operation in spite of a variable computer operating environment, the monitoring system is implemented in Java. The experimental results showed that the developed monitoring programs provided a stable communication.

혈우병 환자에 동반된 자발성 후복막강 출혈

김광일,김동호,우상민,이석주,김홍성,조인성,윤환중,조덕연,김삼용 충남대학교 의과대학 지역사회의학연구소 1997 충남의대잡지 Vol.24 No.1

Spontaneous retroperitoneal hemorrhage due to hemophilia A with impaired coagulopathy is very rare. Spontaneous retroperitoneal hemorrhage has been recorded as having originated from many retroperitoneal organs and blood vessels, and it may be due to local and/or systemic factors. In the majority of the patients, kidney and adrenal gland were the major site of hemorrhage. The systemic causes of spontaneous retroperitoneal hemorrhage are anticoagulation therapy and chronic hemodialysis. During the course of these treatments, hemorrhagic complications may occur at many site, including the retroperitoneal space. Blood dyscrasias including leukemia, polycythemia, sickle cell trait and hemophilia have been reported associated with spontaneous retroperitoneal hemorrhage. We report a case of spontaneous retroperitoneal hemorrhage occurred in a gemophilia A patient with brief review of literature

Supersonically spray-coated copper meshes as textured surfaces for pool boiling

Jo, Hong Seok,Kim, Min-Woo,Kim, Tae Gun,An, Seongpil,Park, Hyun-Goo,Lee, Jong-Gun,James, Scott C.,Choi, Jeehoon,Yoon, Sam S. Elsevier 2018 INTERNATIONAL JOURNAL OF THERMAL SCIENCES Vol.132 No.-

<P><B>Abstract</B></P> <P>Pool boiling is a process through which heat is removed upon the vaporization of a coolant fluid surrounding a heated surface and is often applied for cooling high-performance computing systems and nuclear reactors. Increasing the surface-to-volume ratio in confined spaces enhances this cooling method. Here, we introduce textured copper pillars with various geometric arrangements and study their effects on the pool-boiling performance. Frustum pyramids were formed by supersonic spraying copper microparticles through a wire mesh to form pillars of various sizes. We identified an optimal pyramid-base size of 0.91 mm on each side corresponding to the maximum heat transfer coefficient, critical heat flux, boiling heat transfer, and cross-flow coolant velocity over the pyramids. Maximum bubble nucleation was also achieved using this specific geometric arrangement. Such a geometric design can be installed in heat pipe cooling systems to cool electronic devices and nuclear reactors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Herein we introduce textured copper pillars with varied geometric arrangements. </LI> <LI> Frustum-pyramid pillars were formed by supersonic spraying of copper microparticles. </LI> <LI> We identified the optimal pool boiling scenario. </LI> <LI> Maximum bubble nucleation was achieved for a specific geometric arrangement. </LI> <LI> Such a geometric design can be installed in heat-pipe cooling systems to cool electronic devices. </LI> </UL> </P>

Modifying capillary pressure and boiling regime of micro-porous wicks textured with graphene oxide

Jo, Hong Seok,An, Seongpil,Nguyen, Xuan Hung,Kim, Yong Il,Bang, Boo-Hyoung,James, Scott C.,Choi, Jeehoon,Yoon, Sam S. Elsevier 2018 Applied thermal engineering Vol.128 No.-

<P><B>Abstract</B></P> <P>Liquid flow inside a heat pipe due to capillary forces can be used to cool electronic devices. To promote capillary-driven flow, a multilayer, porous wicking surface was designed for optimal liquid transport. The multilayer-porous structure consists of micro-porous structure decorated with nanomaterials. Herein, we demonstrate that micro-porous copper coated with graphene oxide (GO) has elevated capillary forces that can increase both the critical heat flux and the convective heat transfer coefficient. The thin GO layer promotes hydrophilicity that enhances the wettability of the wicking surface. However, an excessively thick GO coating can decrease permeability even in the presence of increased capillary pressures such that overall flow is hindered. In this work an optimal coating thickness is identified and characterized by heat-transfer experiments and scanning electron microscopy.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A highly porous wicking surface was introduced to promote capillary-driven flow in a heat pipe. </LI> <LI> Micro-porous copper coated with graphite oxide (GO) increased the critical heat flux. </LI> <LI> The thin GO layer promotes hydrophilicity that enhances the wettability of the wicking surface. </LI> <LI> Narrowed pores due to the GO layer increase the capillary pressure and the wicking effects. </LI> </UL> </P>