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홍합 (Mytilus coruscus) 족사 cuticle의 초미세구조 연구
김상식,최승환,윤성진,황동수,Kim, Sangsik,Choi, Seung Hwan,Yoon, Sung Jin,Hwang, Dong Soo 한국해양바이오학회 2014 한국해양바이오학회지 Vol.6 No.2
Mussel byssus is a bundle of threads used to attach mussels to wet substrates. Recently, a thin cuticle layer on the byssus has attracted public attentions due to its remarkable toughness - stiff as epoxy resin and extensible as rubber. Here, we observed ultrastructure of the cuticle layer in a far eastern mussel (Mytilus coruscus) to understand underlying mechanisms for the mechanical properties. The cuticle layer observed by TEM was composed of submicron-sized granular inclusions in a continuous matrix phase. In addition, ultrastructural study in the presence of tertiary amine (Tetraethylammonium, TEA) showed an evidence that the cuticle is stabilized by cation-${\pi}$ interaction.
신발에 IMU 를 장착한 PNS 에서 방위각 편차의 영향 분석
김상식(SangSik Kim),이연규(YearnGui Yi),박찬식(Chansik Park) 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.11
Heading bias effects in PNS using IMUs attached to shoes are analyzed in this paper. The navigation algorithms of a single foot PNS where one IMU is attached to a foot and dual foot PNSs where two IMUs are attached to each foot are derived. Two navigation algorithms are proposed for the dual foot PNS: 1) the positions from the independent right and left foot PNSs are averaged to provide the final position, 2) the right and left foot PNSs are correlated and it provides positions of each foot. Furthermore, it is proven that two methods are equal. Using the derived navigation algorithms the effect of heading bias caused by a misalignment of the moving direction and IMU is analyzed. The analysis explains the position error of a single foot PNS is diverged while the heading bias is effectively compensated in dual foot PNSs because of the symmetry of heading biases. The experimental results confirm the analysis.
김상식(Sangsik Kim),이재웅(Jeawoong Yi),이경우(Kyungwoo Lee),이재헌(Jaeheon Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Ambient Temperature Press Fining of cylinder head valve seat is possible to reduce which are Installation & running cost of machine and field claim. But It is not enough reliability of a theory yet. So this paper provides a theory of ambient temperature press fitting developing process.
김상식 ( Sangsik Kim ),김유정 ( Yujung Kim ) 제주대학교 법과정책연구원 2015 法과 政策 Vol.21 No.2
In South Korea, the Fair Transactions in Franchise Business Act was established in May 2002. The Act has been amended several times to adopt the information disclosure statement registration system, franchise deposit scheme, etc. with a view to fair franchise business transactions. But as the franchise business market has grown rapidly, franchisee damages have also expanded by unfair activities abusing favorable transactional position of franchiser and so forth, increasing franchise business-related disputes each year. In the country, disputes related to franchise business are to be mediated by the Franchise Business Transaction Dispute Settlement Council. The legal effect of its mediation is no more than the contract of compromise under the civil code. Thus, if the franchiser does not follow the mediated resolution on the voluntary basis, the franchisee should file a suit to court again. In this situation, sometimes franchisers, to avoid the corrective measures or recommendations of Fair Trade Commission even temporarily, accept the Council mediation result and gain some more time. In this study, it was noted that such franchise business-related disputes are mostly small-scale cases for less than KRW 10 million and hardly led to a full formal trial. In most of the cases, franchisees are micro-scale owners and in unfavorable position to access information and many others compared to franchisers. Given this aspect, franchise business-related disputes, in its nature, are almost similar to customer disputes. Therefore, it is emphasized in this study that, as the medication by Consumer Dispute Settlement Council is recognized as equally effective as judicial settlement, the Council mediation should be made equally effective to judicial settlement to better protect the franchisees. To this end, the Franchise Business Act needs to be amended to ensure the independence and neutrality of the Council organization, mediation procedural fairness and prudence and others. It is also desirable to change the Council name into settlement committee. In the franchise contracts between a franchiser and franchisee, mediation provisions need to be inserted therein so that disputes can be resolved through mediation.
진동형 히트파이프 단열부 내경 변화에 관한 열 성능 연구
김민선(Minsun Kim),박철우(Chulwoo Park),김상식(Sangsik Kim),김대중(Daejoong Kim) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
The temperature behavior of Pulsating Heat Pipe (PHP) according to the diameter change were studied by limiting the diameter change to only the adiabatic section. To investigate details of temperature behavior, 4 types of PHP are fabricated. Type 1 and 3 have the same inner diameter of evaporator, condenser and adiabatic section of 2 and 3 mm respectively. The diameters of evaporator, condenser and adiabatic section of type 2, 4 are 2/2/3 and 3/3/2 mm respectively. PHP is set up vertically and activated with bottom heat mode. Ethanol is adopted as working fluid and the filling ratio is fixed at 60%. To investigate operation of PHP in various heat input, heat input power was increased from 10 to 140 W with 10 W step. The time for each heat input step is 1200 seconds. As a result of the experiment, PHP type 3 shows the best performance with the thermal resistance of 0.05℃/W at 140 W heat input.
미세 플라스틱 측정을 위한 MEMS 기반 미세유체 구조와 고주파 전송특성을 이용한 전극이 결합된 센서 연구
김진형(JinHyoung Kim),이권홍(Kwonhong Lee),신규식(Kyusik Shin),김상식(Sangsik Kim),구승현(Seunghyeon Koo),최자인(Jain Choi),차철웅(Cheolung Cha) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
Recently, as environmental problems have grown, and among them, fine particles such as fine dust/fine plastic have become a problem, research on fine particle sensors is being actively conducted. In previous studies, the form of simply concentrating fine particles at a high concentration and putting them into a trapping space for measurement was used, and sensors with a structure of reading changes in S-parameters, especially reflection coefficient (S11), at a specific frequency using LC resonance were proposed. This form is not favorable for measuring fine particles that exist in extremely low concentrations in real-life environments. While the structure of reading reflection coefficient (S11) may be convenient for reading with commercial measurement equipment such as a Network Analyzer, it is advantageous to read transmission coefficient (S21) for commercialization. In this study, we captured lowconcentration fine particles dispersed in liquid using MEMS-based microfluidics and filter structures, thereby improving the sensitivity. Additionally, we designed the sensor to read transmission coefficient (S21) instead of reflection coefficient (S11) to increase commercial feasibility. As a result, we designed a fine particle measurement sensor with a center frequency of 1.2 GHz, and confirmed that the frequency shifted from 1.2028 GHz to 1.1929 GHz by inputting microplastics (PE).