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Leheart J.
Attended University of California, Los Angeles
Lives in Seoul, Korea
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Leheart J.

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Swimming microrobots ‘see the invisible’
Chemically-fuelled and magnetically-guided spheres enable microscopy beyond the diffraction limit
- Spherical lenses propelled by chemical fuel offer a simpler and faster way to image objects that are otherwise too small to see through a conventional microscope.1 Joseph Wang’s University of California, San Diego (UCSD), team’s ‘swimming microrobot’ lenses magnify features smaller than the ‘diffraction limit’ resolvable by light microscopy.
- The microrobots ‘see the invisible’, team member Jinxing Li tells Chemistry World, by pushing optical microscopes’ lower resolution limit down from about 200nm to about 50nm. ‘And we easily get this magnification directly by using a white-light microscope with a very short exposure time,’ Li says.
- Stitching together small images formed as the microrobots swim up and down makes a larger picture. This avoids the complicated labelling and processing that go with super-resolution techniques that empower researchers today to regularly breach the diffraction limit.
- Wang’s team has long worked on micro- and nano-robots, which are usually tiny objects coated with platinum acting as a catalyst in breaking down hydrogen peroxide fuel. The scientists first used the resulting propulsion to move nanomotors that focused light in an approach intended to help make electronic devices even smaller in 2014.2 After that they decided to use similar robots to magnify structures for super-resolution imaging, Li explains.
- In this case, the swimming microrobots are either transparent polystyrene or titanium dioxide spheres, with a metal coating on one side small enough to avoid blocking light. Underneath the platinum catalyst layer Wang, Li and their colleagues also add a nickel layer that allows them to steer the spheres with magnets.
The scientists put microrobots on top of objects they want to see, and then cover them in a solution of hydrogen peroxide in water. The catalytic reaction starts the robots moving, at a speed from 5–35μm/s, depending on the fuel concentration. The team has shown that this approach works on various materials, including synthetic patterns, protein and DNA structures, and mouse brain tissue.
- read more:
https://www.chemistryworld.com/news/swimming-microrobots-see-the-invisible/1017424.article
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HK, Dec 2014
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@cafe, Seoul, Korea.
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"we are what we think"
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"ET Land" (Electronic Land Mall)
in district of "Yongsan" located inside SEOUL, SOUTH KOREA.

Fallout 4
Life-size (about 8-9 feet tall) power armor


전자랜드별관  
Shopping Mall
Address: 51-31 Wonhyoro 3(sam)-ga, Yongsan-gu, Seoul
Phone:02-707-4700
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This is definitely one of the best versions of "Summer" I have witnessed.

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Education
  • University of California, Los Angeles
    2002 - 2007
Basic Information
Gender
Female
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Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Seoul, Korea
Previously
Tokyo, Japan
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간호사가 취고로 아가를 신경써주고 친절한 사랑과 아는게많아서 걱정이 하나도 없었어요.깨끗한 환경과 친절한 간호사하고 너무 맜있는 음식이 딱 좋았다! 뷔페같은 풍부한 음식이 너무 맛있고 건강한 것과, 한림동탄대학병원에 가까워서 왔습니다. 편리하고 캐끗한 산후조리원! 간호사도 아주 잘해주고 아기도 잘 돌봅니다. I stayed at this postnatal clinic, also known as "confinement center" in China, or basically a place where Korean women who have given birth go to rest for 2-3 weeks to recover. This is similar to an outpatient clinic where there are nurses on staff 24 hours a day watching your newborn (and other newborns) and you stay in private rooms with cable TV, a crib, a large bed, and other necessities to take care of your newborn. You are fed 3 square meals a day - large, delicious buffet style meals - and 2 snacks. There are luxurious postnatal Korean whole-body massages available for about $120 a session, but the basic 2 week or 3 week package stay includes free DAILY breast massages to prevent mastitis and plugged ducts. There's also free yoga classes, lactation consultants teaching you how to breastfeed, among other things and Sitz Baths to help heal those bottom parts that recently got stitches. Though the best part is probably the 24 hour on call staff taking care of your newborn by feeding, bathing, cleaning, wrapping, and "baby care" 24/7 (including the umbilical cord care and looking for jaundice among other things). The nurses take a great deal of care and attention to your baby and are very experienced, several with more than 20 years of experience in baby care. They are incredibly friendly and polite, with a smile on their face all the time, but most importantly the staff here at Haneul Gorae are right on the dot on feeding and cleaning the baby. They are professional but also very very VERY nice. Most other postnatal clinics do NOT allow the mothers to leave the center (as in you're supposed to stay inside the building and not exit for the entire duration) in the belief that when you exit, you come back with germs and colds and sickness from the outside environment and carry it into the clinic. However, this clinic has sanitization posts at the entrance, allows mothers to leave briefly to get supplies like diapers, daily laundry with bleach, daily cleaning, weekly full-on sanitization, air conditioner cleaning, and try their best to keep everything as clean as possible. The price is reasonable! Every week a Pediatrician also comes by to check the health of the baby - looking for abnormalities like developing Jaundice or heart conditions, etc. The 2 week package stay is about $1700~ and the 3 week package is $2400. Keep in mind the exchange rates may differ depending on the time of this review, so exact pricing will vary. Overall, it's about $120 or so a day to stay here. Personally, as an American I thought it was completely worth it. I was able to rest fully and have me and my baby taken care of. Also, as a new mom, this place was like "Lab" where I got to practice my skills on how to do things like breastfeeding, changing diapers, washing baby, etc. Families and husbands can stay with you. Foreigners have stayed here, however, at least one person needs to be able to speak Korean, or you're going to have a tough time. The staff here don't speak English, so you could use your Google Translate to communicate or just muddle it out. Honestly if you're a military dependent like me stuck in a foreign country with no outside help and your husband is off TDY or deployed, a place like this to be taken care of post-labor is golden. I strongly recommend this postnatal/postpartum clinic to Koreans and foreigners, expatriates, military members stationed in Korea. This clinic has had foreigners stay (American, Japanese, Chinese, European etc). In fact, there are two right now as I write this. 8 minutes from Hallym Dongtan University Hospital 45 minutes from Osan Air Base (AB) 8 minutes from Emart
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Public - 6 months ago
reviewed 6 months ago
I got my 기본증명서 and 가족관계증명서 here, which are documents needed for a Korean American to get an F-4 visa at the Suwon Immigration center 수원출입국사무소, located elsewhere nearby about 10 min drive
Public - a year ago
reviewed a year ago
E-mart, Osan (Grocery Store)
Public - a year ago
reviewed a year ago
너무 맜있어요! I'm American and wow, this was the tastiest bakery I've ever had in Korea!! I love it!
Public - 2 years ago
reviewed 2 years ago
8 reviews
Map
Map
Map
Hi-Mart
Public - a year ago
reviewed a year ago
"World Market" International grocery store/mart. Southeast Asian ingredients (Vietnam, Indonesia, Thailand, phillippines, indian etc.) Sauces, powders, and spices.
Public - a year ago
reviewed a year ago