• Proceedings of the Korean Society of Veterinary Clinics Conference
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• 2006.11a
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• pp.112-112
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• 2006

• Proceedings of the Korean Information Science Society Conference
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• 2002.10c
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• pp.574-576
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• 2002

VPN, 전자상거래 등의 인터넷 서비스들이 인터넷을 통해 빠르게 퍼져가고 있지만, 인터넷이 가지고 있는 보안 취약성 때문에 항상 해킹의 위험에 노출되어 있다. 이러한 해킹의 피해를 최소화하고 동적으로 침입을 감지할 수 있는 침입 탐지 시스템과 같은 보안 솔루션이 필요하다. 그리고, 보안 정책이 없는 관리 시스템은 보안 환경의 변화에 민첩하게 대처하지 못하고 통합된 관리 방법을 제시하지 못한다 이 논문에서는 표준화된 보안 정책과 분석, 유지, 복구 기능을 가지고 정책을 기반으로 동작하는 보안 관리 시스템을 설계하였다. 보안 관리 시스템은 정책에 따라 관리 상태를 설정하고, 정책의 통신을 위해 COPS를 이용한다. 그리고, 네트워크상의 패킷을 필터링하고 침입을 탐지하며 불법 침입을 통보한다.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.33 no.3
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• pp.37-42
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• 2004

흡수식 냉동기의 구성요소에 관한 성능향상 및 배열을 이용한 코제네레이션 시스템의 소개한다. 1997년 12월에 개최된 지구온난화 방지 교토회의(COP3-기후변동협조조약 제3회 체결국 회합)에서, 일본은 2008년-2012년까지 온실효과가스의 배출량을 1990년도 시점을 기준으로 6% 삭감하기로 합의하였다. 이러한 배경에 따라 $CO_2$ 배출량의 삭감에 대한 새로운 공업기술의 전개가 진행되고 있으며, 일본의 냉동공조산업 분야에서도 코제네레이션이라는 에너지 절약 관점으로부터 흡수식 냉동기가 다시 주목을 받게 되는 계기가 되었다.(중략)

• Journal of Advanced Marine Engineering and Technology
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• v.33 no.8
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• pp.1123-1128
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• 2009

In this paper, the cycle performance characteristics of a cascade refrigeration system with internal heat exchanger using natural refrigerants is presented to offer the basic design data for the operating parameters of the system. This system considered in this study is consisted of a high temperature cycle using a carbon dioxide(R744) and low temperature cycle using refrigerants such as R290, R1270, R600a and Ethane. The main results were summarized as follows : The COP of the cascade refrigeration system of R600a with internal heat exchanger is the highest grade in low temperature cycle using refrigerants such as R290, R1270, R600a and Ethane. The COP of the cascade refrigeration system with internal heat exchanger only in high temperature cycle is the highest value among three type cycle, such as only low temperature cycle, only high temperature cycle and all the cycle.

• Korean Journal of Applied Biomechanics
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• v.25 no.4
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• pp.393-399
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• 2015

Objective : This study was conducted with an aim to use it as basic data for developing assistive devices, such as insoles that can suppress the progress of degenerative diseases and strategies, to improve early degenerative diseases by assessing walking characteristics of farm workers who were classified as KL-grade in the perspective of motor mechanics. Method : 38 male and female adults who complained of knee joint pain for more than six months were selected, and they were classified according to KL-grade. KL-grade was assessed by an orthopaedic specialist and an occupational environment health specialist. Filming equipment (FX-1, CASIO, Japan) and a ground reaction force system (AMTI OR6, AMTI, USA) were used to identify ground reaction force characteristics, and WOMAC was used for a pain rating scale. Results : There was a difference between the right and left side (axis-X) according to KL-grade, and when the grade was higher, the internal ground reaction force was also higher. Changes in COP were not affected by KL-grade of the knee joint, but it tended to increase as the grade increased. There were differences in the time required for limb support while walking according to the grades, and when the grade was higher, walking was more inefficient with long braking force and short propulsion forces. Also, pain rating scale, the right and left side, and COP changes while in support phase were related. Conclusion : There was a partial, statically significant difference in KL-grade and ground reaction force occurring during the support phase, and there were differences in ground reaction forces according to the grades of degenerative arthritis in the knee joint, indicating that this study is worthy as basic data for future studies.

• Korean Journal of Applied Biomechanics
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• v.25 no.4
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• pp.413-421
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• 2015

Objective : The purpose of this study was to investigate biomechanical changes of the lower limb including dynamic stability with changes in illumination (300Lx, 150Lx, and 5Lx) and slope (level and $15^{\circ}$ downhill) as risk factors for elderly falls. Method : Fifteen elderly females were selected for this study. Seven infrared cameras (Proreflex MCU 240: Qualisys, Sweden) and an instrumented treadmill (Bertec, USA) surrounded by illumination regulators and lights to change the levels of illumination were used to collect the data. A One-Way ANOVA with repeated measures using SPSS 12.0 was used to analyze statistical differences by the changes in illumination and slope. Statistical significance was set at ${\alpha}=.05$. Results : No differences in the joint movement of the lower limbs were found with changes in illumination (p>.05). The maximum plantar flexion movement of the ankle joints appeared to be greater at 5Lx compared to 300Lx during slope gait (p<.05). Additionally, maximum extension movement of the hip joints appeared to be greater at 5Lx and 150Lx compared to 300Lx during slope gait (p<.05). The maximum COM-COP angular velocity (direction to medial side of the body) of dynamic stability appeared to be smaller at 150Lx and 300Lx compared to 5Lx during level gait (p<.05). The minimum COM-COP angular velocity (direction to lateral side to the body) of dynamic stability appeared smaller at 150Lx compared to 5Lx during level gait (p<.05). Conclusion : In conclusion, elderly people use a stabilization strategy that reduces walk speed and dynamic stability as darkness increases. Therefore, the changes in illumination during gait induce the changes in gait mechanics which may increase the levels of biomechanical risk in elderly falls.

• Journal of Veterinary Clinics
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• v.31 no.3
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• pp.226-232
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• 2014

An 8-month-old domestic shorthair cat presented with decreased activity and anorexia. Diagnostic imaging revealed cranial mediastinal mass and enlarged mesenteric lymph nodes. Fine needle aspirates showed a marked increase in malignant lymphocytes. Multicentric lymphoma (stage V-b) was diagnosed. The cat treated with COP protocol chemotherapy, and complete remission was induced. CNS relapse developed 314 days after the initiation of chemotherapy. Treatment with rescue protocol greatly reduced the clinical signs for a short period. The cat was in partial remission for 33 days and overall survival time was 383 days. Multicentric T-cell lymphoma with brain involvement was confirmed after necropsy by histopathology and immunohistochemistry.

• Journal of the Korean Society for Marine Environment & Energy
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• v.14 no.4
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• pp.301-306
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• 2011

The paper presents an analysis of the heating cycle and discusses a desalination cycle that uses lowtemperature seawater. The basic heating cycle model is the heat pump cycle, and seawater desalination is usually performed by the indirect freezing desalination method. The low temperature of the seawater (below $5^{\circ}C$) acts as the heat source of the evaporator. R-134a, R-1234yf, R-600a are used as working fluids. In the 2-stage compression cycle, the compressor's work decreased by about 15.6% from that in the 1-stage compression cycle. Further, the COP in the 2-stage cycle was 17.6% higher than that in the 1-stage cycle. In the indirect desalination cycle, the energy per unit fresh water productivity in the 2-stage cycle was 19.8% lower than that in the 1-stage cycle.

• Transactions of the KSME C: Technology and Education
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• v.4 no.1
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• pp.3-10
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• 2016

Heat pump unit performance is represented by the COP(Coefficient of Performance) and expressed by the one point design condition according to KS C 9306. However, when heat pump operated to the real buildings, the simulations are changed continuously according to the actual weather conditions, the building load and heat pump source conditions. The purpose of this paper is to evaluate the APF(Annual performance factor) for a climate dependent building integrated air-to-air heat pump system in major cities in Korea. TRNSYS simulation tool with an international MV standard based IPMVP 4.4.2 was utilized to perform the annual performance analysis. The APF with the multi-performance data based method was calculated as 2.29 for Daejeon residential building case while Busan residential building case appeared as the highest with 2.36.

• Journal of The Korean Society of Integrative Medicine
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• v.5 no.4
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• pp.1-9
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• 2017

Purpose : This study was conducted among 195 adults in their 20s. To analyze the impact of the slope types of the scapulae on the plantar surface of the foot, the average pressure (AP), the maximum pressure (MP), the average of local distribution values, and the average movement of the center of pressure (COP) of the different slope types of the scapulae were compared. Method : The anterior-posterior slopes of the scapulae were measured by comparing the slopes of the left and right sides of the scapulae based on the differences in the height and the slope of the coracoid process and the angulus inferior scapulae. Those whose left side of the scapulae had an anterior slope were categorized as type 1, and those whose right side of the scapulae had an anterior slope, as type 2. The average plantar pressure, the center of plantar pressure, the maximum plantar pressure, and local distribution values were analyzed using a plantar pressure analyzer of the FSA. Result : In terms of the AP of the left and right feet, there was no statistically significant difference both in types 1 and 2 on the left and right feet. The comparison results of the MP and the average of local distribution values of the two slope types of the scapulae showed that there was no statistically significant difference on the X-axis both in types 1 and 2 on the left and right feet, but that there was a large statistically significant difference on the Y-axis both in types 1 and 2. That is, the MP of the right foot of the left anterior slope type was located more on the hindfoot than that of the right anterior slope type, and the MP of the left foot of the left anterior slope type was located more on the hindfoot than that of right anterior slope type. Conclusion : This study can be used as fundamental data to predict differences in the location and size of the COP and changes in plantar pressure distribution depending on the slope types of the scapulae, and control the distribution for therapeutic purposes.