• 정보보호학회논문지
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• 제23권1호
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• pp.11-18
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• 2013

실행코드의 변조와 역분석 방지를 위해 단순히 선행블록에서 암, 복호화 키를 얻던 기존의 기법과 달리, 암호학적 MAC함수를 이용한 암호화기법과 코드 블록 간 중요도에 따라 상관관계를 설정하고 상관관계에 따라 암, 복호화 키를 생성하는 새로운 변조 방지 기법을 제안한다. 본 논문에서는 기존의 해쉬함수 대신 암호학적 MAC함수를 사용하고 MAC함수의 키를 동적으로 생성하는 방법을 소개한다. 또 단순히 선행블록의 해쉬 값에서 키를 얻는 것이 아니라 실행 코드 블록을 중요도에 따라 중요도 높음, 중간, 낮음으로 분류하고 중요도 높음 블록은 암호화하고 중요도 중간 블록은 중요도 높음 블록의 키를 생성시키는 블록으로 분류한다. 또 중요도 낮음 블록은 아무 처리도 하지 않음으로 소프트웨어 효율성을 고려한다. 기존 해쉬함수 대신 동적으로 생성되는 링크키를 이용한 MAC함수와 블록상관관계를 함께 사용함으로써 공격자의 분석을 어렵게 한다.

• 정보보호학회논문지
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• 제30권2호
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• pp.279-286
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• 2020

4차 산업혁명의 핵심 자원인 데이터의 융합과 활용을 촉진하여 데이터 산업의 발전을 지원하기 위해 2020년 2월 4일 「개인정보 보호법」이 개정 되었다. 법에서 적용하는 범위가 통신사업자와 금융사업자는 물론 개인정보 처리 사업자까지 늘어남에 따라 관련된 분쟁조정의 범위도 늘어날 것으로 보인다. 이에 본 논문에서는 개인정보 분쟁위원회의 역할·기능과 개인정보 분쟁조정의 제도적 기준에 대한 소개를 먼저하고, 개인정보 분쟁조정위원회가 데이터 3법개정에 따라 앞으로 해야 할 이슈에 대해 연구해 보았다. 이번 연구에서는 개인정보 분쟁조정에 대한 효율적인 운영을 위해 분야별 전문가 심의, 새로운 산업 기술에 대한 신규 조정기준, 개인정보 분쟁위원회와 개인정보위원회와의 업무연속성 확보방안, 조정결정과 법원간의 연계성 확보, 집단 분쟁 조정의 운영기준 강화 등을 제시하였다.

• 대한전기학회논문지:시스템및제어부문D
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• 제55권7호
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• pp.303-312
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• 2006

This paper proposes the architecture and protocol of a data communication network for the safety system in nuclear power plants. First, we establish four design criteria with respect to determinability, reliability, separation and isolation, and verification/validation. Next we construct the architecture of the safety network for the following systems: PPS (Plant Protection System), ESF-CCS (Engineered Safety Features-Component Control System) and CPCS (Core Protection Calculator System). The safety network consists of 12 sub-networks and takes the form of a hierarchical star. Among 163 communication nodes are about 1600 origin-destination (OD) pairs created on their traffic demands. The OD pairs are allowed to exchange data only during the pre-assigned time slots. Finally, the communication protocol is designed in consideration of design factors for the safety network. The design factors include a network topology of star, fiber-optic transmission media, synchronous data transfer mode, point-to-point link configuration, and a periodic transmission schedule etc. The resulting protocol is the modification of IEEE 802.15.4 (LR-WPAN) MAC combined with IEEE 802.3 (Fast Ethernet) PHY. The MAC layer of IEEE 802.15.4 is simplified by eliminating some unnecessary (unctions. Most importantly, the optional TDMA-like scheme called the guaranteed time slot (GTS) is changed to be mandatory to guarantee the periodic data transfer. The proposed protocol is formally specified using the SDL. By performing simulations and validations using Telelogic Tau SDL Suite, we find that the proposed safety protocol fits well with the characteristics and the requirements of the safety system in nuclear power plants.

• Asian Pacific Journal of Cancer Prevention
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• 제17권3호
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• pp.993-1001
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• 2016

Type 2 diabetes mellitus patients are at increased risk of many forms of malignancies, especially of the pancreas, colon and hepatocellular cancer. Unfortunately, little is known of the possible interaction between antidiabetic drugs and anticancer agents. The present study investigates the influence of metformin (MET) and sitagliptin (SITA) on the in vitro anticancer activity of the microtubule depolymerization inhibitor agent epothilone A (EpoA). Hepatocellular liver carcinoma cell line (HepG2) viability and apoptosis were determined by the MTT test and by double staining with PO-PRO-1 and 7-aminoactinomycin D, respectively, after treatment with EpoA, metformin or sitagliptin. The levels of nuclear factor NF-${\kappa}B$ and p53 were evaluated in the presence and absence of inhibitors. While EpoA and MET inhibited HepG2 cell proliferation, SITA did not. EpoA and SITA induced higher p53 levels than MET. All tested drugs increased the level of NF-${\kappa}B$. Only MET enhanced the proapoptotic effect of EpoA. The EpoA+MET combination evoked the highest cytotoxic effect on HepG2 cells and led to apoptosis independent of p53, decreasing the level of NF-${\kappa}B$. These findings support the link between NF-${\kappa}B$ and p53 in the modulation of apoptotic effects in HepG2 cells treated by EpoA. Our studies indicate that the combination of EpoA and MET applied in subtoxic doses has a stronger cytotoxic effect on liver cancer cells than each of the compounds alone. The therapeutic advantages of the combination of EpoA with MET may be valuable in the treatment of patients with diabetes mellitus type 2 (T2DM) and liver cancer.

• 한국중재학회지:중재연구
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• 제30권4호
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• pp.121-138
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• 2020

The O2O services in the healthcare sector have only been in full swing for about three years, and unlike existing O2O consumer goods, the scale and scope of the dispute are more complicated due to restrictions on medical treatment. In this study, O2O service platform operators and medical institutions' roles and responsibilities were redefined as a countermeasure for resolving disputes in healthcare O2O services and the laws for changing the transaction environment. A change in institutional mechanisms was proposed. This study looked at the types of consumer disputes related to healthcare O2O services as insufficient information problems, problems in the course of medical service implementation, problems with immunity provisions for platform operators, cancellations, and non-compliance with refunds. All the information generated during transactions in the healthcare sector was extensive in scale and included the most sensitive information among personal information, stressing the importance of ensuring security. The area that started in the O2O range before the medical institution visit also proposed a plan to establish a system for the delivery of proven information as a pre-medical person. The scale and growth will grow faster, given that consumers can experience the information they want anytime, anywhere they want. However, the platform broker's role, a link player, will become more important because consumers who use the service will have their first meeting with non-face-to-face product providers. On the other hand, service providers may have side effects of misleading consumers by providing false information or misleading consumers through exaggerated advertisements. The O2O service market is expected to expand beyond distribution and dining out to the entire industry. However, since it is challenging to check accurate statistics on the detailed market, various disputes and consumer protection measures will be required for each detailed market, and comprehensive leading solutions will be essential in the future.

• 한국학교ㆍ지역보건교육학회지
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• 제9권1호
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• pp.1-15
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• 2008

Objectives: The concept of the WHO's 'Health Promoting School (HPS)' has been advocated as an approach enhancing national health promotion through school. Health-promoting schools have existed internationally about 20 years. Yet there are few comprehensive evaluation results. Methods: This study is a cross-sectional survey, aiming to explore the HPS status. A total of 31 elementary, middle and high schools were included, and 260 teachers participated in the study. The schools were assessed based on tools of HPS. Results: 'School health promotion and protection services' and 'school's physical environment' had the highest scores, 80.7 score and 77.4 score, respectively. Community links and action competencies for healthy living were two areas with the lowest scores. Conclusions: These results are a good source of reference for assessment and evaluation of Health Promoting Schools programs. For the improvement of efficiency of Health Promoting Schools programs, cooperation with family and community link and support system would be necessary.

• 한국의류학회지
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• 제19권6호
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• pp.866-886
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• 1995

The purpose of this study is to analyze the pattern and the meaning of textiles, and decorative techniques of ikat weaving and dyeing in Indonesia. The textile design also analyzes by examining the method of ikat techniques such as warp ikat, weft ikat and double ikat, and by classifying the style of regions. The most common motifs are geometric designs of spirals, meanders, straight lines, triangles, and circles which are influenced by outside world. Although these motifs or symbols have been evident since prehistoric times, their design and meaning have been continually reinterpreted as changes in the ceremonies and rituals. While motifs such as reptiles, birds, and human figures, depicted in spiral, hooked and rhomb configurations, have been identified among the most resilient features of Indonesian textile design, new meanings have been added to these ancient forms, and designs have been transformed and reinterpreted to suit local conceptions. Since textiles are a visual expression of Indcufsian life, textiles place the individual symbolically within social milieu, identifying rank, family, locality and religious affiliations. Textiles represent a link between the human and the spiritual realm, and a vehicle for the display of sacred and secular potency Ikat textiles play to embody special transforming powers and sacred mediating qualities, providing protection and evoking life-enriching forces for individuals or social group.

• Journal of Biosystems Engineering
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• 제31권1호
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• pp.16-23
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• 2006

Depth and working load control is one of the most important technique in control system for tractor rotary implement automation. Keeping the depth consistent is critical to bring along crops and to improve the efficiency and quality of the following operations. Keeping the load of engine consistent is an essential factor for the efficiency of operation and engine protection of tractor. In this study we investigated the possibility of application of depth and working load control system for tractor using a proportional valve through field tests. Depth control was implemented by the ascent and descent of 3 point linkage for the change of setting depth. There were 4 mm and 5.2 mm control deviations for setting depths of 50mm and 100mm, respectively. Load control was operated appropriately by the ascent and of descent of 3 point link for the change of setting working load. The standard deviations between setting load and engine load were 171 rpm at 1.3 km/h and 164 rpm at 2.3 km/h tractor travel velocity. The results of experiment showed that the characteristics of response was sufficient to be used as the implement depth and working load control system for tractor using proportional valve.

• Journal of Power Electronics
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• 제17권1호
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• pp.242-252
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• 2017

This paper deals with the blocking of DC-fault current during DC cable short-circuit conditions in HVDC (High-Voltage DC) transmission systems utilizing Modular Multilevel Converters (MMCs), where a new SubModule (SM) topology circuit for the MMC is proposed. In this SM circuit, an additional Insulated-Gate Bipolar Translator (IGBT) is required to be connected at the output terminal of a conventional SM with a half-bridge structure, hereafter referred to as HBSM, where the anti-parallel diodes of additional IGBTs are used to block current from the grid to the DC-link side. Compared with the existing MMCs based on full-bridge (FB) SMs, the hybrid topologies of HBSM and FBSM, and the clamp-double SMs, the proposed topology offers a lower cost and lower power loss while the fault current blocking capability in the DC short-circuit conditions is still provided. The effectiveness of the proposed topology has been validated by simulation results obtained from a 300-kV 300-MW HVDC transmission system and experimental results from a down-scaled HVDC system in the laboratory.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2004년도 춘계학술발표회
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• pp.600-605
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• 2004

The road construction with horizontal expansion of country using and augmentation of traffic demand is advanced actively and it accompanies hereupon, the above of 70% of the country is formed at the mountain in our country where the hazard cut slope has been created. In this study, It is prepared a effective management countermeasure of cut slope introduced priority investigation decision method against hazard cut slope which is influenced by abnormally rainfall by an unusual change in the weather such as a guerilla rainfall character. In meaning link, It was executed collapse cause by failure character analysis in the cut slope which has failed for the last five years and it is prepared the hazard grade criterion from E to A grade according to collapse cause. It is decided that a maintenance management grade by the hazard grade classification criterion of cut slope. So It is possible to hazard cut slope. It is established failure protection counter countermeasure by effective maintenance management through the hazard grade c1assification criterion and it will be able to dispose to advanced nation level like Hong Kong and Japanese.